// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "ash/wm/splitview/split_view_controller.h"
#include <algorithm>
#include <cmath>
#include <cstdint>
#include <limits>
#include <optional>
#include <vector>
#include "ash/accessibility/accessibility_controller.h"
#include "ash/constants/ash_features.h"
#include "ash/display/screen_orientation_controller.h"
#include "ash/display/window_tree_host_manager.h"
#include "ash/keyboard/ui/keyboard_ui_controller.h"
#include "ash/public/cpp/metrics_util.h"
#include "ash/public/cpp/window_properties.h"
#include "ash/root_window_controller.h"
#include "ash/root_window_settings.h"
#include "ash/screen_util.h"
#include "ash/session/session_controller_impl.h"
#include "ash/shell.h"
#include "ash/style/ash_color_provider.h"
#include "ash/wm/desks/desks_controller.h"
#include "ash/wm/desks/desks_util.h"
#include "ash/wm/float/float_controller.h"
#include "ash/wm/mru_window_tracker.h"
#include "ash/wm/overview/delayed_animation_observer_impl.h"
#include "ash/wm/overview/overview_controller.h"
#include "ash/wm/overview/overview_grid.h"
#include "ash/wm/overview/overview_item.h"
#include "ash/wm/overview/overview_metrics.h"
#include "ash/wm/overview/overview_types.h"
#include "ash/wm/overview/overview_utils.h"
#include "ash/wm/snap_group/snap_group.h"
#include "ash/wm/snap_group/snap_group_controller.h"
#include "ash/wm/snap_group/snap_group_metrics.h"
#include "ash/wm/splitview/auto_snap_controller.h"
#include "ash/wm/splitview/split_view_constants.h"
#include "ash/wm/splitview/split_view_divider.h"
#include "ash/wm/splitview/split_view_metrics_controller.h"
#include "ash/wm/splitview/split_view_observer.h"
#include "ash/wm/splitview/split_view_overview_session.h"
#include "ash/wm/splitview/split_view_utils.h"
#include "ash/wm/tablet_mode/tablet_mode_window_state.h"
#include "ash/wm/window_positioning_utils.h"
#include "ash/wm/window_properties.h"
#include "ash/wm/window_resizer.h"
#include "ash/wm/window_restore/window_restore_controller.h"
#include "ash/wm/window_state.h"
#include "ash/wm/window_transient_descendant_iterator.h"
#include "ash/wm/window_util.h"
#include "ash/wm/wm_metrics.h"
#include "base/auto_reset.h"
#include "base/containers/flat_map.h"
#include "base/debug/crash_logging.h"
#include "base/functional/bind.h"
#include "base/metrics/histogram_macros.h"
#include "base/metrics/user_metrics.h"
#include "base/notreached.h"
#include "base/ranges/algorithm.h"
#include "base/time/time.h"
#include "chromeos/ui/base/app_types.h"
#include "chromeos/ui/base/window_properties.h"
#include "chromeos/ui/base/window_state_type.h"
#include "chromeos/ui/frame/caption_buttons/snap_controller.h"
#include "components/app_restore/desk_template_read_handler.h"
#include "components/app_restore/window_properties.h"
#include "ui/aura/client/aura_constants.h"
#include "ui/aura/window_delegate.h"
#include "ui/base/ime/ash/ime_bridge.h"
#include "ui/base/ime/input_method.h"
#include "ui/compositor/layer.h"
#include "ui/compositor/layer_animator.h"
#include "ui/compositor/presentation_time_recorder.h"
#include "ui/compositor/throughput_tracker.h"
#include "ui/display/screen.h"
#include "ui/display/types/display_constants.h"
#include "ui/gfx/animation/slide_animation.h"
#include "ui/gfx/animation/tween.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/transform_util.h"
#include "ui/views/animation/compositor_animation_runner.h"
#include "ui/views/widget/widget.h"
#include "ui/wm/core/coordinate_conversion.h"
#include "ui/wm/core/shadow_controller.h"
#include "ui/wm/core/window_util.h"
#include "ui/wm/public/activation_client.h"
namespace ash {
namespace {
using chromeos::WindowStateType;
// Five fixed position ratios of the divider, which means the divider can
// always be moved to these five positions.
constexpr float kFixedPositionRatios[] = {0.f, chromeos::kOneThirdSnapRatio,
chromeos::kDefaultSnapRatio,
chromeos::kTwoThirdSnapRatio, 1.0f};
// The black scrim starts to fade in when the divider is moved past the two
// optional positions (`chromeos::kOneThirdSnapRatio`,
// `chromeos::kTwoThirdSnapRatio`) and reaches to its maximum opacity
// (`kBlackScrimOpacity`) after moving `kBlackScrimFadeInRatio` of the screen
// width. See https://crbug.com/827730 for details.
constexpr float kBlackScrimFadeInRatio = 0.1f;
constexpr float kBlackScrimOpacity = 0.4f;
// The speed at which the divider is moved controls whether windows are scaled
// or translated. If the divider is moved more than this many pixels per second,
// the "fast" mode is enabled.
constexpr int kSplitViewThresholdPixelsPerSec = 72;
// This is how often the divider drag speed is checked.
constexpr base::TimeDelta kSplitViewChunkTime = base::Milliseconds(500);
// Records the animation smoothness when the divider is released during a resize
// and animated to a fixed position ratio.
constexpr char kDividerAnimationSmoothness[] =
"Ash.SplitViewResize.AnimationSmoothness.DividerAnimation";
// Histogram names that record presentation time of resize operation with
// following conditions:
// a) tablet split view, one snapped window, empty overview grid;
// b) tablet split view, two snapped windows;
// c) tablet split view, one snapped window, nonempty overview grid;
constexpr char kTabletSplitViewResizeSingleHistogram[] =
"Ash.SplitViewResize.PresentationTime.TabletMode.SingleWindow";
constexpr char kTabletSplitViewResizeMultiHistogram[] =
"Ash.SplitViewResize.PresentationTime.TabletMode.MultiWindow";
constexpr char kTabletSplitViewResizeWithOverviewHistogram[] =
"Ash.SplitViewResize.PresentationTime.TabletMode.WithOverview";
constexpr char kTabletSplitViewResizeSingleMaxLatencyHistogram[] =
"Ash.SplitViewResize.PresentationTime.MaxLatency.TabletMode.SingleWindow";
constexpr char kTabletSplitViewResizeMultiMaxLatencyHistogram[] =
"Ash.SplitViewResize.PresentationTime.MaxLatency.TabletMode.MultiWindow";
constexpr char kTabletSplitViewResizeWithOverviewMaxLatencyHistogram[] =
"Ash.SplitViewResize.PresentationTime.MaxLatency.TabletMode.WithOverview";
// The time when the number of roots in split view changes from one to two. Used
// for the purpose of metric collection.
base::Time g_multi_display_split_view_start_time;
bool g_use_fast_resize_for_testing = false;
bool InTabletMode() {
return display::Screen::GetScreen()->InTabletMode();
}
bool IsExactlyOneRootInSplitView() {
const aura::Window::Windows all_root_windows = Shell::GetAllRootWindows();
return 1 ==
base::ranges::count_if(
all_root_windows, [](aura::Window* root_window) {
return SplitViewController::Get(root_window)->InSplitViewMode();
});
}
ui::InputMethod* GetCurrentInputMethod() {
if (auto* bridge = IMEBridge::Get()) {
if (auto* handler = bridge->GetInputContextHandler())
return handler->GetInputMethod();
}
return nullptr;
}
void RemoveSnappingWindowFromOverviewIfApplicable(
OverviewSession* overview_session,
aura::Window* window) {
if (!overview_session) {
return;
}
OverviewItemBase* item = overview_session->GetOverviewItemForWindow(window);
if (!item) {
return;
}
// Remove it from overview. The transform will be reset later after the window
// is snapped. Note the remaining windows in overview don't need to be
// repositioned in this case as they have been positioned to the right place
// during dragging.
item->EnsureVisible();
item->RestoreWindow(/*reset_transform=*/false, /*animate=*/true);
overview_session->RemoveItem(item);
}
// If there is a window in the snap position, trigger a WMEvent to snap it in
// the corresponding position.
void TriggerWMEventToSnapWindow(WindowState* window_state,
WMEventType event_type) {
CHECK(event_type == WM_EVENT_SNAP_PRIMARY ||
event_type == WM_EVENT_SNAP_SECONDARY);
const WindowSnapWMEvent window_event(
event_type,
window_state->snap_ratio().value_or(chromeos::kDefaultSnapRatio));
window_state->OnWMEvent(&window_event);
}
// Returns true if the snap state of the `window` has changed if it's already in
// split view mode.
bool DidInSplitViewWindowChange(aura::Window* window,
SplitViewController* split_view_controller,
SnapPosition snap_position) {
if (!split_view_controller->IsWindowInSplitView(window)) {
return false;
}
const auto* window_state = WindowState::Get(window);
if (window_state->GetStateType() !=
GetWindowStateTypeFromSnapPosition(snap_position)) {
return true;
}
// For the current tablet mode split view design, we can assume that the
// `window` is being snapped to the same `snap_position` it was snapped since
// it's single layer design. We need to check if the snap ratio is the same.
std::optional<float> snap_ratio = window_state->snap_ratio();
// Get the snap ratio for the window that is currently occupying the
// `snap_position`.
const auto* window_state_in_current_snap_position =
WindowState::Get(split_view_controller->GetSnappedWindow(snap_position));
const bool same_snap_ratio =
snap_ratio && window_state_in_current_snap_position &&
*snap_ratio == window_state_in_current_snap_position->snap_ratio();
return !same_snap_ratio;
}
} // namespace
// -----------------------------------------------------------------------------
// DividerSnapAnimation:
// Animates the divider to its closest fixed position.
// `SplitViewController::IsResizingWithDivider()` is assumed to be already false
// before this animation starts, but some resizing logic is delayed until this
// animation ends.
class SplitViewController::DividerSnapAnimation
: public gfx::SlideAnimation,
public gfx::AnimationDelegate {
public:
DividerSnapAnimation(SplitViewController* split_view_controller,
int starting_position,
int ending_position,
base::TimeDelta duration,
gfx::Tween::Type tween_type)
: gfx::SlideAnimation(this),
split_view_controller_(split_view_controller),
starting_position_(starting_position),
ending_position_(ending_position) {
SetSlideDuration(duration);
SetTweenType(tween_type);
aura::Window* window = split_view_controller->primary_window()
? split_view_controller->primary_window()
: split_view_controller->secondary_window();
DCHECK(window);
// |widget| may be null in tests. It will use the default animation
// container in this case.
views::Widget* widget = views::Widget::GetWidgetForNativeWindow(window);
if (!widget)
return;
gfx::AnimationContainer* container = new gfx::AnimationContainer();
container->SetAnimationRunner(
std::make_unique<views::CompositorAnimationRunner>(widget, FROM_HERE));
SetContainer(container);
tracker_.emplace(widget->GetCompositor()->RequestNewThroughputTracker());
tracker_->Start(
metrics_util::ForSmoothnessV3(base::BindRepeating([](int smoothness) {
UMA_HISTOGRAM_PERCENTAGE(kDividerAnimationSmoothness, smoothness);
})));
}
DividerSnapAnimation(const DividerSnapAnimation&) = delete;
DividerSnapAnimation& operator=(const DividerSnapAnimation&) = delete;
~DividerSnapAnimation() override = default;
int ending_position() const { return ending_position_; }
private:
// gfx::AnimationDelegate:
void AnimationEnded(const gfx::Animation* animation) override {
DCHECK(split_view_controller_->InSplitViewMode());
DCHECK(!split_view_controller_->IsResizingWithDivider());
DCHECK_EQ(ending_position_, split_view_controller_->GetDividerPosition());
split_view_controller_->EndResizeWithDividerImpl();
split_view_controller_->EndSplitViewAfterResizingAtEdgeIfAppropriate();
if (tracker_)
tracker_->Stop();
}
void AnimationProgressed(const gfx::Animation* animation) override {
DCHECK(split_view_controller_->InSplitViewMode());
DCHECK(!split_view_controller_->IsResizingWithDivider());
// TODO(b/327685487): Remove these when the crash is fixed.
const int divider_position_before_tween =
split_view_controller_->GetDividerPosition();
split_view_controller_->split_view_divider()->SetDividerPosition(
CurrentValueBetween(starting_position_, ending_position_));
const int divider_position_after_tween =
split_view_controller_->GetDividerPosition();
split_view_controller_->NotifyDividerPositionChanged();
const int divider_position_after_notify =
split_view_controller_->GetDividerPosition();
split_view_controller_->UpdateSnappedWindowsAndDividerBounds();
const int divider_position_after_update =
split_view_controller_->GetDividerPosition();
// Updating the window may stop animation.
if (is_animating()) {
// Map the tablet resize mode to a string.
base::flat_map<SplitViewController::TabletResizeMode, std::string>
resize_mode_as_string = {
{SplitViewController::TabletResizeMode::kNormal, "kNormal"},
{SplitViewController::TabletResizeMode::kFast, "kFast"},
};
SCOPED_CRASH_KEY_STRING32(
"b327685487", "tablet_resize_mode",
resize_mode_as_string[split_view_controller_->tablet_resize_mode_]);
SCOPED_CRASH_KEY_BOOL("b327685487", "in_tablet_mode", InTabletMode());
SCOPED_CRASH_KEY_BOOL(
"b327685487", "has_divider_widget",
!!split_view_controller_->split_view_divider()->divider_widget());
SCOPED_CRASH_KEY_BOOL("b327685487", "in_split_view",
split_view_controller_->InSplitViewMode());
SCOPED_CRASH_KEY_BOOL("b327685487", "is_divider_resizing",
split_view_controller_->IsResizingWithDivider());
SCOPED_CRASH_KEY_NUMBER("b327685487", "before_tween",
divider_position_before_tween);
SCOPED_CRASH_KEY_NUMBER("b327685487", "after_tween",
divider_position_after_tween);
SCOPED_CRASH_KEY_NUMBER("b327685487", "after_notify",
divider_position_after_notify);
SCOPED_CRASH_KEY_NUMBER("b327685487", "after_update",
divider_position_after_update);
SCOPED_CRASH_KEY_NUMBER("b327685487", "starting_position",
starting_position_);
SCOPED_CRASH_KEY_NUMBER("b327685487", "ending_position",
ending_position_);
split_view_controller_->UpdateResizeBackdrop();
split_view_controller_->SetWindowsTransformDuringResizing();
}
}
void AnimationCanceled(const gfx::Animation* animation) override {
if (tracker_)
tracker_->Cancel();
}
raw_ptr<SplitViewController> split_view_controller_;
int starting_position_;
int ending_position_;
std::optional<ui::ThroughputTracker> tracker_;
};
// -----------------------------------------------------------------------------
// ToBeSnappedWindowsObserver:
// Helper class that prepares windows that are changing to snapped window state.
// This allows async window state type changes and handles calls to
// SplitViewController when necessary.
class SplitViewController::ToBeSnappedWindowsObserver
: public aura::WindowObserver,
public WindowStateObserver {
public:
explicit ToBeSnappedWindowsObserver(
SplitViewController* split_view_controller)
: split_view_controller_(split_view_controller) {}
ToBeSnappedWindowsObserver(const ToBeSnappedWindowsObserver&) = delete;
ToBeSnappedWindowsObserver& operator=(const ToBeSnappedWindowsObserver&) =
delete;
~ToBeSnappedWindowsObserver() override {
for (auto& to_be_snapped_window : to_be_snapped_windows_) {
if (aura::Window* window = to_be_snapped_window.second.window) {
window->RemoveObserver(this);
WindowState::Get(window)->RemoveObserver(this);
}
}
to_be_snapped_windows_.clear();
}
void AddToBeSnappedWindow(aura::Window* window,
SnapPosition snap_position,
WindowSnapActionSource snap_action_source) {
if (DidInSplitViewWindowChange(window, split_view_controller_,
snap_position)) {
split_view_controller_->AttachToBeSnappedWindow(window, snap_position,
snap_action_source);
return;
}
aura::Window* old_window = to_be_snapped_windows_[snap_position].window;
if (old_window == window) {
return;
}
// Stop observing any previous to-be-snapped window in `snap_position`. This
// can happen to Android windows as its window state and bounds change are
// async, so it's possible to snap another window to the same position while
// waiting for the snapping of the previous window.
if (old_window) {
to_be_snapped_windows_.erase(snap_position);
WindowState::Get(old_window)->RemoveObserver(this);
old_window->RemoveObserver(this);
}
// If the to-be-snapped window already has the desired snapped window state,
// no need to listen to the state change notification (there will be none
// anyway), instead just attach the window to split screen directly.
WindowState* window_state = WindowState::Get(window);
if (window_state->GetStateType() ==
GetWindowStateTypeFromSnapPosition(snap_position)) {
split_view_controller_->AttachToBeSnappedWindow(window, snap_position,
snap_action_source);
split_view_controller_->OnWindowSnapped(window,
/*previous_state=*/std::nullopt,
snap_action_source);
} else {
to_be_snapped_windows_[snap_position] =
WindowAndSnapSourceInfo{window, snap_action_source};
window_state->AddObserver(this);
window->AddObserver(this);
}
}
bool IsObserving(const aura::Window* window) const {
return FindWindow(window) != to_be_snapped_windows_.end();
}
// aura::WindowObserver:
void OnWindowDestroying(aura::Window* window) override {
auto iter = FindWindow(window);
DCHECK(iter != to_be_snapped_windows_.end());
window->RemoveObserver(this);
WindowState::Get(window)->RemoveObserver(this);
to_be_snapped_windows_.erase(iter);
}
// WindowStateObserver:
void OnPreWindowStateTypeChange(WindowState* window_state,
WindowStateType old_type) override {
aura::Window* window = window_state->window();
// When arriving here, we know the to-be-snapped window's state has just
// changed and its bounds will be changed soon.
auto iter = FindWindow(window);
DCHECK(iter != to_be_snapped_windows_.end());
SnapPosition snap_position = iter->first;
// If the new window type is the target snapped state, remove the window
// from `to_be_snapped_windows_` and do some prep work for snapping it in
// split screen. Otherwise (i.e. if the new window type is not the target
// one) just ignore the event and keep waiting for the next event.
if (window_state->GetStateType() ==
GetWindowStateTypeFromSnapPosition(snap_position)) {
const auto cached_snap_action_source = iter->second.snap_action_source;
to_be_snapped_windows_.erase(iter);
window_state->RemoveObserver(this);
window->RemoveObserver(this);
split_view_controller_->AttachToBeSnappedWindow(
window, snap_position, cached_snap_action_source);
}
}
private:
// Contains the info of the window to be snapped and its corresponding snap
// action source.
struct WindowAndSnapSourceInfo {
raw_ptr<aura::Window> window = nullptr;
WindowSnapActionSource snap_action_source =
WindowSnapActionSource::kNotSpecified;
};
base::flat_map<SnapPosition, WindowAndSnapSourceInfo>::const_iterator
FindWindow(const aura::Window* window) const {
for (auto iter = to_be_snapped_windows_.begin();
iter != to_be_snapped_windows_.end(); iter++) {
if (iter->second.window == window) {
return iter;
}
}
return to_be_snapped_windows_.end();
}
const raw_ptr<SplitViewController> split_view_controller_;
// Maps the snap position to the to-be-snapped window with its corresponding
// snap action source.
base::flat_map<SnapPosition, WindowAndSnapSourceInfo> to_be_snapped_windows_;
};
// static
SplitViewController* SplitViewController::Get(const aura::Window* window) {
DCHECK(window);
DCHECK(window->GetRootWindow());
DCHECK(RootWindowController::ForWindow(window));
return RootWindowController::ForWindow(window)->split_view_controller();
}
// -----------------------------------------------------------------------------
// SplitViewController:
SplitViewController::SplitViewController(aura::Window* root_window)
: root_window_(root_window),
to_be_snapped_windows_observer_(
std::make_unique<ToBeSnappedWindowsObserver>(this)),
split_view_divider_(this),
split_view_metrics_controller_(
std::make_unique<SplitViewMetricsController>(this)) {
Shell::Get()->accessibility_controller()->AddObserver(this);
}
SplitViewController::~SplitViewController() {
if (AccessibilityController* a11y_controller =
Shell::Get()->accessibility_controller()) {
a11y_controller->RemoveObserver(this);
}
EndSplitView(EndReason::kRootWindowDestroyed);
}
int SplitViewController::GetDividerPosition() const {
return split_view_divider_.divider_position();
}
bool SplitViewController::IsResizingWithDivider() const {
return split_view_divider_.HasDividerWidget() &&
split_view_divider_.is_resizing_with_divider();
}
bool SplitViewController::InSplitViewMode() const {
return state_ != State::kNoSnap;
}
bool SplitViewController::InClamshellSplitViewMode() const {
return InSplitViewMode() && !InTabletMode();
}
bool SplitViewController::InTabletSplitViewMode() const {
return InSplitViewMode() && InTabletMode();
}
bool SplitViewController::CanSnapWindow(aura::Window* window,
float snap_ratio) const {
if (!ShouldAllowSplitView())
return false;
if (!WindowState::Get(window)->CanSnapOnDisplay(
display::Screen::GetScreen()->GetDisplayNearestWindow(
const_cast<aura::Window*>(root_window_.get())))) {
return false;
}
// Windows created by window restore are not activatable while being restored.
// However, we still want to be able to snap these windows at this point.
const bool is_to_be_restored_window =
window == WindowRestoreController::Get()->to_be_snapped_window();
// TODO(sammiequon): Investigate if we need to check for window activation.
if (!is_to_be_restored_window && !wm::CanActivateWindow(window))
return false;
// We only need to consider the divider width in tablet mode or Snap Groups.
const int divider_delta =
ShouldConsiderDivider() ? kSplitviewDividerShortSideLength / 2 : 0;
return GetMinimumWindowLength(window, IsLayoutHorizontal(window)) <=
GetDividerPositionUpperLimit(root_window_) * snap_ratio -
divider_delta;
}
bool SplitViewController::CanKeepCurrentSnapRatio(
aura::Window* snapped_window) const {
return CanSnapWindow(snapped_window,
WindowState::Get(snapped_window)
->snap_ratio()
.value_or(chromeos::kDefaultSnapRatio));
}
std::optional<float> SplitViewController::ComputeAutoSnapRatio(
aura::Window* window) {
// If there is no default snapped window, or it doesn't have a stored snap
// ratio try snapping it to 1/2.
aura::Window* default_window = GetDefaultSnappedWindow();
std::optional<float> default_window_snap_ratio =
default_window ? WindowState::Get(default_window)->snap_ratio()
: std::nullopt;
if (!default_window_snap_ratio) {
return CanSnapWindow(window, chromeos::kDefaultSnapRatio)
? std::make_optional(chromeos::kDefaultSnapRatio)
: std::nullopt;
}
// Maps the snap ratio of the default window to the snap ratio of the opposite
// window.
static constexpr auto kOppositeRatiosMap =
base::MakeFixedFlatMap<float, float>(
{{chromeos::kOneThirdSnapRatio, chromeos::kTwoThirdSnapRatio},
{chromeos::kDefaultSnapRatio, chromeos::kDefaultSnapRatio},
{chromeos::kTwoThirdSnapRatio, chromeos::kOneThirdSnapRatio}});
auto it = kOppositeRatiosMap.find(*default_window_snap_ratio);
// TODO(sammiequon): Investigate if this check is needed. It may be needed for
// rounding errors (i.e. 2/3 may be 0.67).
if (it == kOppositeRatiosMap.end()) {
return CanSnapWindow(window, chromeos::kDefaultSnapRatio)
? std::make_optional(chromeos::kDefaultSnapRatio)
: std::nullopt;
}
// If `window` can be snapped to the ideal snap ratio, we are done.
float snap_ratio = it->second;
if (CanSnapWindow(window, snap_ratio)) {
return snap_ratio;
}
// Reaching here, we cannot snap `window` to its ideal snap ratio. If the
// ideal snap ratio was 1/3, we try snapping to 1/2, but only if the default
// window can be snapped to 1/2 as well.
if (snap_ratio == chromeos::kOneThirdSnapRatio &&
CanSnapWindow(window, chromeos::kDefaultSnapRatio) &&
CanSnapWindow(default_window, chromeos::kDefaultSnapRatio)) {
return chromeos::kDefaultSnapRatio;
}
return std::nullopt;
}
bool SplitViewController::WillStartPartialOverview(aura::Window* window) const {
const bool can_start_in_tablet = InTabletMode() && !IsInOverviewSession();
const bool can_start_in_clamshell =
CanStartSplitViewOverviewSessionInClamshell(
window, WindowState::Get(window)->snap_action_source().value_or(
WindowSnapActionSource::kNotSpecified));
// Note that at this point `state_` may not have been updated yet, so check if
// only one of `primary_window_` or `secondary_window_` is snapped.
return (can_start_in_tablet || can_start_in_clamshell) &&
!DesksController::Get()->animation() &&
!!primary_window_ != !!secondary_window_;
}
void SplitViewController::SnapWindow(aura::Window* window,
SnapPosition snap_position,
WindowSnapActionSource snap_action_source,
bool activate_window,
float snap_ratio) {
DCHECK(window && CanSnapWindow(window, snap_ratio));
DCHECK_NE(snap_position, SnapPosition::kNone);
if (IsDividerAnimating()) {
StopSnapAnimation();
}
OverviewSession* overview_session = GetOverviewSession();
if (activate_window ||
(overview_session &&
overview_session->IsWindowActiveWindowBeforeOverview(window))) {
to_be_activated_window_ = window;
}
to_be_snapped_windows_observer_->AddToBeSnappedWindow(window, snap_position,
snap_action_source);
// Move |window| to the display of |root_window_| first before sending the
// WMEvent. Otherwise it may be snapped to the wrong display.
if (root_window_ != window->GetRootWindow()) {
window_util::MoveWindowToDisplay(window,
display::Screen::GetScreen()
->GetDisplayNearestWindow(root_window_)
.id());
}
const WindowSnapWMEvent event(snap_position == SnapPosition::kPrimary
? WM_EVENT_SNAP_PRIMARY
: WM_EVENT_SNAP_SECONDARY,
snap_ratio, snap_action_source);
WindowState::Get(window)->OnWMEvent(&event);
base::RecordAction(base::UserMetricsAction("SplitView_SnapWindow"));
}
void SplitViewController::OnSnapEvent(
aura::Window* window,
WMEventType event_type,
WindowSnapActionSource snap_action_source) {
CHECK(event_type == WM_EVENT_SNAP_PRIMARY ||
event_type == WM_EVENT_SNAP_SECONDARY);
// If split view can't be enabled at the moment, do nothing.
if (!ShouldAllowSplitView()) {
return;
}
const bool in_overview = IsInOverviewSession();
// In clamshell mode, only if overview is active on window snapped or in
// faster split screen setup session, the window should be managed by
// `SplitViewController`. Otherwise, the window should be managed by
// `WindowState`.
if (!InTabletMode() &&
!(in_overview || ShouldConsiderWindowForSplitViewSetupView(
window, snap_action_source))) {
return;
}
// If the snap wm event is from desk template launch when in overview, do not
// try to snap the window in split screen. Otherwise, overview might be exited
// because of window snapping.
const int32_t window_id =
window->GetProperty(app_restore::kRestoreWindowIdKey);
if (in_overview &&
window == WindowRestoreController::Get()->to_be_snapped_window() &&
app_restore::DeskTemplateReadHandler::Get()->GetWindowInfo(window_id)) {
return;
}
// Do nothing if `window` is already waiting to be snapped in split screen.
// Order here matters: this must return for auto-snap windows before they try
// to override `GetDividerPosition()` from a `new_snap_ratio` below.
if (to_be_snapped_windows_observer_->IsObserving(window)) {
return;
}
const SnapPosition to_snap_position = event_type == WM_EVENT_SNAP_PRIMARY
? SnapPosition::kPrimary
: SnapPosition::kSecondary;
// Start observing the to-be-snapped window.
to_be_snapped_windows_observer_->AddToBeSnappedWindow(
window, to_snap_position, snap_action_source);
}
void SplitViewController::AttachToBeSnappedWindow(
aura::Window* window,
SnapPosition snap_position,
WindowSnapActionSource snap_action_source) {
// Save the transformed bounds in preparation for the snapping animation.
UpdateSnappingWindowTransformedBounds(window);
OverviewSession* overview_session = GetOverviewSession();
RemoveSnappingWindowFromOverviewIfApplicable(overview_session, window);
if (state_ == State::kNoSnap) {
default_snap_position_ = snap_position;
// TODO(b/339066590): Add new histogram for splitview starting in
// `OnWindowSnapped|UpdateStateAndNotifyObservers()`.
splitview_start_time_ = base::Time::Now();
// We are about to enter split view on |root_window_|. If split view is
// already active on exactly one root, then |root_window_| will be the
// second root, and so multi-display split view begins now.
if (IsExactlyOneRootInSplitView()) {
base::RecordAction(
base::UserMetricsAction("SplitView_MultiDisplaySplitView"));
g_multi_display_split_view_start_time = splitview_start_time_;
}
}
aura::Window* previous_snapped_window = nullptr;
aura::Window* other_window = nullptr;
if (snap_position == SnapPosition::kPrimary) {
if (primary_window_ != window) {
previous_snapped_window = primary_window_;
StopObserving(SnapPosition::kPrimary);
primary_window_ = window;
}
if (secondary_window_ == window) {
// Remove `window` from `secondary_window_` if it was previously snapped
// there, i.e. during cycle snap or swap windows.
secondary_window_ = nullptr;
default_snap_position_ = SnapPosition::kPrimary;
}
// `other_window` must be set last, since we may have removed
// `secondary_window_`.
other_window = secondary_window_;
} else if (snap_position == SnapPosition::kSecondary) {
// See above comments.
if (secondary_window_ != window) {
previous_snapped_window = secondary_window_;
StopObserving(SnapPosition::kSecondary);
secondary_window_ = window;
}
if (primary_window_ == window) {
primary_window_ = nullptr;
default_snap_position_ = SnapPosition::kSecondary;
}
other_window = primary_window_;
}
StartObserving(window);
// Insert the previous snapped window to overview if overview is active.
DCHECK_EQ(overview_session, GetOverviewSession());
if (previous_snapped_window && overview_session) {
InsertWindowToOverview(previous_snapped_window);
// Ensure that the close icon will fade in. This part is redundant for
// dragging from overview, but necessary for dragging from the top. For
// dragging from overview, |OverviewItem::OnSelectorItemDragEnded| will be
// called on all overview items including the |previous_snapped_window|
// item anyway, whereas for dragging from the top,
// |OverviewItem::OnSelectorItemDragEnded| already was called on all
// overview items and |previous_snapped_window| was not yet among them.
overview_session->GetOverviewItemForWindow(previous_snapped_window)
->OnOverviewItemDragEnded(/*snap=*/true);
}
// Get the divider position given by `snap_ratio` if exists, or if there is
// pre-set `divider_position_`, use it, which can happen during tablet <->
// clamshell transition or multi-user transition. If neither `snap_ratio` nor
// `divider_position_` exists, calculate the divider position with the default
// snap ratio i.e. `chromeos::kDefaultSnapRatio`.
// TODO(michelefan): See if it is a valid case to not having `snap_ratio`
// while `divider_position` is less than 0.
bool do_snap_animation = false;
int divider_position =
split_view_divider_.divider_widget() ? GetDividerPosition() : -1;
if (std::optional<float> snap_ratio = WindowState::Get(window)->snap_ratio();
snap_ratio) {
divider_position = CalculateDividerPosition(
root_window_, snap_position, *snap_ratio, ShouldConsiderDivider());
// If `other_window` can't fit in the requested snap ratio, show a snap
// animation below.
do_snap_animation =
other_window && !CanSnapWindow(other_window, 1.f - *snap_ratio);
} else if (divider_position < 0) {
divider_position = CalculateDividerPosition(root_window_, snap_position,
chromeos::kDefaultSnapRatio,
ShouldConsiderDivider());
}
// In clamshell mode we simply update `divider_position`. In tablet mode we
// will show the divider widget below.
split_view_divider_.SetDividerPosition(divider_position);
base::RecordAction(base::UserMetricsAction("SplitView_SnapWindow"));
if (!InTabletMode()) {
return;
}
split_view_divider_.SetVisible(true);
CHECK(split_view_divider_.HasDividerWidget());
const int fixed_divider_position =
GetClosestFixedDividerPosition(divider_position);
// This must be done before we update `split_view_divider_.divider_position_`
// to `fixed_divider_position`, since the minimum size will be respected
// there.
if (do_snap_animation) {
// When `window` is re-snapped, i.e. from 1/2 to 2/3, but `other_window`
// can't fit in the requested snap ratio, set `divider_snap_animation_` to
// Hide then Show, to give off the impression of bouncing the divider back
// to `old_divider_position`. Note the duration is 2 *
// `kBouncingAnimationOneWayDuration` to bounce out then in.
tablet_resize_mode_ = TabletResizeMode::kFast;
divider_snap_animation_ = std::make_unique<DividerSnapAnimation>(
this, /*starting_position=*/divider_position,
/*ending_position=*/fixed_divider_position,
2 * kBouncingAnimationOneWayDuration, gfx::Tween::FAST_OUT_SLOW_IN_3);
divider_snap_animation_->Hide();
divider_snap_animation_->Show();
}
split_view_divider_.SetDividerPosition(fixed_divider_position);
}
aura::Window* SplitViewController::GetSnappedWindow(SnapPosition position) {
DCHECK_NE(SnapPosition::kNone, position);
return position == SnapPosition::kPrimary ? primary_window_.get()
: secondary_window_.get();
}
aura::Window* SplitViewController::GetDefaultSnappedWindow() {
if (default_snap_position_ == SnapPosition::kPrimary)
return primary_window_;
if (default_snap_position_ == SnapPosition::kSecondary)
return secondary_window_;
return nullptr;
}
gfx::Rect SplitViewController::GetSnappedWindowBoundsInParent(
SnapPosition snap_position,
aura::Window* window_for_minimum_size,
float snap_ratio) {
gfx::Rect bounds =
GetSnappedWindowBoundsInScreen(snap_position, window_for_minimum_size,
snap_ratio, ShouldConsiderDivider());
wm::ConvertRectFromScreen(root_window_, &bounds);
return bounds;
}
bool SplitViewController::ShouldConsiderDivider() const {
// The divider may be visible in tablet mode, or between two windows in a
// snap group in clamshell mode.
// In tablet mode, we always consider the divider width even if
// `split_view_divider_` is not initialized yet because
// `ClientControlledState` may need to know the snapped bounds before
// actually snapping the windows.
// TODO(b/309856199): Currently need to pipe `account_for_divider_width` since
// the divider is still created in `SplitViewController` for Snap Groups.
// Refactor this when `split_view_divider_` is moved out.
return split_view_divider_.HasDividerWidget() || InTabletMode();
}
bool SplitViewController::IsDividerAnimating() const {
return divider_snap_animation_ && divider_snap_animation_->is_animating();
}
void SplitViewController::EndSplitView(EndReason end_reason) {
if (!InSplitViewMode()) {
return;
}
end_reason_ = end_reason;
// If we are currently in a resize but split view is ending, make sure to end
// the resize. This can happen, for example, on the transition back to
// clamshell mode or when a task is minimized during a resize. Likewise, if
// split view is ending during the divider snap animation, then clean that up.
// But if the split view is ending due to the destroy of `root_window_`, we
// should skip the resize.
const bool is_divider_animating = IsDividerAnimating();
if ((IsResizingWithDivider() || is_divider_animating) &&
end_reason != EndReason::kRootWindowDestroyed) {
if (is_divider_animating) {
// Don't call StopAndShoveAnimatedDivider as it will call observers.
StopSnapAnimation();
}
EndResizeWithDividerImpl();
}
// There is at least one case where this line of code is needed: if the user
// presses Ctrl+W while resizing a clamshell split view window.
presentation_time_recorder_.reset();
// Remove observers when the split view mode ends.
Shell* shell = Shell::Get();
shell->RemoveShellObserver(this);
OverviewController::Get()->RemoveObserver(this);
keyboard::KeyboardUIController::Get()->RemoveObserver(this);
shell->activation_client()->RemoveObserver(this);
auto_snap_controller_.reset();
if (end_reason != EndReason::kRootWindowDestroyed) {
// TODO(http://b/343542206): Break down the
// `SplitViewOverviewSessionExitPoint` enum in
// `SplitViewController::EndSplitView()`.
const SplitViewOverviewSessionExitPoint exit_point =
end_reason == EndReason::kSnapGroups
? SplitViewOverviewSessionExitPoint::kCompleteByActivating
: SplitViewOverviewSessionExitPoint::kShutdown;
// `EndSplitView()` is also called upon `~RootWindowController()` and
// `~SplitViewController()`, during which `root_window_` would have been
// destroyed.
RootWindowController::ForWindow(root_window_)
->EndSplitViewOverviewSession(exit_point);
}
StopObserving(SnapPosition::kPrimary);
StopObserving(SnapPosition::kSecondary);
black_scrim_layer_.reset();
default_snap_position_ = SnapPosition::kNone;
divider_closest_ratio_ = std::numeric_limits<float>::quiet_NaN();
snapping_window_transformed_bounds_map_.clear();
UpdateStateAndNotifyObservers();
// Close splitview divider widget after updating state so that
// OnDisplayMetricsChanged triggered by the widget closing correctly
// finds out !InSplitViewMode().
split_view_divider_.SetVisible(false);
base::RecordAction(base::UserMetricsAction("SplitView_EndSplitView"));
const base::Time now = base::Time::Now();
UMA_HISTOGRAM_LONG_TIMES("Ash.SplitView.TimeInSplitView",
now - splitview_start_time_);
// We just ended split view on |root_window_|. If there is exactly one root
// where split view is still active, then multi-display split view ends now.
if (IsExactlyOneRootInSplitView()) {
UMA_HISTOGRAM_LONG_TIMES("Ash.SplitView.TimeInMultiDisplaySplitView",
now - g_multi_display_split_view_start_time);
}
}
bool SplitViewController::IsWindowInSplitView(
const aura::Window* window) const {
return window && (window == primary_window_ || window == secondary_window_);
}
bool SplitViewController::IsWindowInTransitionalState(
const aura::Window* window) const {
return to_be_snapped_windows_observer_->IsObserving(window);
}
void SplitViewController::OnOverviewButtonTrayLongPressed(
const gfx::Point& event_location) {
// Do nothing if split view is not enabled.
if (!ShouldAllowSplitView())
return;
// If in split view: The active snapped window becomes maximized. If overview
// was seen alongside a snapped window, then overview mode ends.
//
// Otherwise: Enter split view iff the cycle list has at least one window, and
// the first one is snappable.
MruWindowTracker::WindowList mru_window_list =
Shell::Get()->mru_window_tracker()->BuildWindowForCycleList(kActiveDesk);
// Do nothing if there is one or less windows in the MRU list.
if (mru_window_list.empty())
return;
auto* overview_controller = Shell::Get()->overview_controller();
aura::Window* target_window = mru_window_list[0];
// Exit split view mode if we are already in it.
if (InSplitViewMode()) {
DCHECK(IsWindowInSplitView(target_window));
DCHECK(target_window);
EndSplitView();
overview_controller->EndOverview(
OverviewEndAction::kOverviewButtonLongPress);
MaximizeIfSnapped(target_window);
wm::ActivateWindow(target_window);
base::RecordAction(
base::UserMetricsAction("Tablet_LongPressOverviewButtonExitSplitView"));
return;
}
// Show a toast if the window cannot be snapped.
if (!CanSnapWindow(target_window, chromeos::kDefaultSnapRatio)) {
ShowAppCannotSnapToast();
return;
}
// Save the overview enter/exit types to be used if the window is snapped.
overview_start_action_ = OverviewStartAction::kOverviewButtonLongPress;
enter_exit_overview_type_ = OverviewEnterExitType::kImmediateEnter;
SnapWindow(target_window, SnapPosition::kPrimary,
WindowSnapActionSource::kLongPressOverviewButtonToSnap,
/*activate_window=*/true);
base::RecordAction(
base::UserMetricsAction("Tablet_LongPressOverviewButtonEnterSplitView"));
}
void SplitViewController::OnWindowDragStarted(aura::Window* dragged_window) {
DCHECK(dragged_window);
// OnSnappedWindowDetached() may end split view mode.
if (IsWindowInSplitView(dragged_window)) {
OnSnappedWindowDetached(dragged_window,
WindowDetachedReason::kWindowDragged);
}
if (split_view_divider_.divider_widget()) {
split_view_divider_.OnWindowDragStarted(dragged_window);
}
}
void SplitViewController::OnWindowDragEnded(
aura::Window* dragged_window,
SnapPosition desired_snap_position,
const gfx::Point& last_location_in_screen,
WindowSnapActionSource snap_action_source) {
DCHECK(!window_util::IsDraggingTabs(dragged_window));
EndWindowDragImpl(dragged_window, dragged_window->is_destroying(),
desired_snap_position, last_location_in_screen,
snap_action_source);
}
void SplitViewController::OnWindowDragCanceled() {
if (split_view_divider_.divider_widget()) {
split_view_divider_.OnWindowDragEnded();
}
}
SnapPosition SplitViewController::ComputeSnapPosition(
const gfx::Point& last_location_in_screen) {
const int divider_position =
InSplitViewMode()
? GetDividerPosition()
: CalculateDividerPosition(root_window_, SnapPosition::kPrimary,
chromeos::kDefaultSnapRatio,
ShouldConsiderDivider());
const int position = IsLayoutHorizontal(root_window_)
? last_location_in_screen.x()
: last_location_in_screen.y();
return (position <= divider_position) == IsLayoutPrimary(root_window_)
? SnapPosition::kPrimary
: SnapPosition::kSecondary;
}
bool SplitViewController::BoundsChangeIsFromVKAndAllowed(
aura::Window* window) const {
// Make sure that it is the bottom window who is requiring bounds change.
return changing_bounds_by_vk_ &&
window == (IsLayoutPrimary(window) ? secondary_window_.get()
: primary_window_.get());
}
void SplitViewController::AddObserver(SplitViewObserver* observer) {
observers_.AddObserver(observer);
}
void SplitViewController::RemoveObserver(SplitViewObserver* observer) {
observers_.RemoveObserver(observer);
}
void SplitViewController::OnWindowPropertyChanged(aura::Window* window,
const void* key,
intptr_t old) {
// If the window's resizibility property changes (must be from resizable ->
// unresizable), end the split view mode and also end overview mode if
// overview mode is active at the moment.
if (key != aura::client::kResizeBehaviorKey)
return;
// It is possible the property gets updated and is still the same value.
if (window->GetProperty(aura::client::kResizeBehaviorKey) ==
static_cast<int>(old)) {
return;
}
if (CanKeepCurrentSnapRatio(window)) {
return;
}
EndSplitView();
Shell::Get()->overview_controller()->EndOverview(
OverviewEndAction::kSplitView);
ShowAppCannotSnapToast();
}
void SplitViewController::OnWindowBoundsChanged(
aura::Window* window,
const gfx::Rect& old_bounds,
const gfx::Rect& new_bounds,
ui::PropertyChangeReason reason) {
if (!InClamshellSplitViewMode() || split_view_divider_.divider_widget()) {
// Divider width is not taken into consideration in the calculation below.
// Early exit if `split_view_divider_` exists in clamshell mode.
return;
}
if (WindowState* window_state = WindowState::Get(window);
window_state->is_dragged()) {
if (presentation_time_recorder_) {
presentation_time_recorder_->RequestNext();
}
}
// During clamshell split view, we resize the window + overview at the same
// time. `overview_utils` will do the work to calculate the overview grid
// bounds from the window snapped in split view.
}
void SplitViewController::OnWindowDestroyed(aura::Window* window) {
DCHECK(InSplitViewMode());
DCHECK(IsWindowInSplitView(window));
OnSnappedWindowDetached(window, WindowDetachedReason::kWindowDestroyed);
}
void SplitViewController::OnWindowRemovingFromRootWindow(
aura::Window* window,
aura::Window* new_root) {
if (new_root) {
// Detach the window first to stop ongoing divider animations.
OnSnappedWindowDetached(window,
WindowDetachedReason::kWindowMovedToAnotherDisplay);
}
}
void SplitViewController::OnPostWindowStateTypeChange(
WindowState* window_state,
WindowStateType old_type) {
DCHECK_EQ(
window_state->GetDisplay().id(),
display::Screen::GetScreen()->GetDisplayNearestWindow(root_window_).id());
aura::Window* window = window_state->window();
if (window_state->IsSnapped()) {
OnWindowSnapped(window, old_type,
window_state->snap_action_source().value_or(
WindowSnapActionSource::kNotSpecified));
} else if (window_state->IsNormalStateType() || window_state->IsMaximized() ||
window_state->IsFullscreen() || window_state->IsFloated()) {
// End split view, and also overview if overview is active, in these cases:
// 1. A left clamshell split view window gets unsnapped by Alt+[.
// 2. A right clamshell split view window gets unsnapped by Alt+].
// 3. A (clamshell or tablet) split view window gets maximized.
// 4. A (clamshell or tablet) split view window becomes full screen.
// 5. A split view window becomes floated.
EndSplitView();
Shell::Get()->overview_controller()->EndOverview(
OverviewEndAction::kSplitView);
} else if (window_state->IsMinimized()) {
OnSnappedWindowDetached(window, WindowDetachedReason::kWindowMinimized);
if (!InSplitViewMode()) {
// We have different behaviors for a minimized window: in tablet splitview
// mode, we'll insert the minimized window back to overview, as normally
// the window is not supposed to be minmized in tablet mode. And in
// clamshell splitview mode, we respect the minimization of the window
// and end overview instead.
if (InTabletMode()) {
InsertWindowToOverview(window);
} else {
Shell::Get()->overview_controller()->EndOverview(
OverviewEndAction::kSplitView);
}
}
}
}
void SplitViewController::OnPinnedStateChanged(aura::Window* pinned_window) {
// Disable split view for pinned windows.
if (WindowState::Get(pinned_window)->IsPinned() && InSplitViewMode())
EndSplitView(EndReason::kUnsnappableWindowActivated);
}
void SplitViewController::OnOverviewModeStarting() {
CHECK(InSplitViewMode());
// While in clamshell split view mode without being in a snap group
// creation session, a full overview session should be triggered. In this
// case, split view should end.
if (InClamshellSplitViewMode() &&
!RootWindowController::ForWindow(root_window_)
->split_view_overview_session()) {
EndSplitView();
return;
}
// If split view mode is active, reset |state_| to make it be able to select
// another window from overview window grid.
if (default_snap_position_ == SnapPosition::kPrimary) {
StopObserving(SnapPosition::kSecondary);
} else if (default_snap_position_ == SnapPosition::kSecondary) {
StopObserving(SnapPosition::kPrimary);
}
UpdateStateAndNotifyObservers();
}
void SplitViewController::OnOverviewModeEnding(
OverviewSession* overview_session) {
DCHECK(InSplitViewMode());
// If overview is ended because of a window getting snapped, suppress the
// overview exiting animation.
if (state_ == State::kBothSnapped)
overview_session->SetWindowListNotAnimatedWhenExiting(root_window_);
// If clamshell split view mode is active, bail out. `OnOverviewModeEnded`
// will end split view. We do not end split view here, because that would mess
// up histograms of overview exit animation smoothness.
if (!InTabletMode()) {
return;
}
// Tablet split view mode is active. If it still only has one snapped window,
// snap the first snappable window in the overview grid on the other side.
if (state_ == State::kBothSnapped) {
return;
}
OverviewGrid* current_grid =
overview_session->GetGridWithRootWindow(root_window_);
if (!current_grid || current_grid->empty()) {
return;
}
for (const auto& overview_item : current_grid->item_list()) {
for (aura::Window* window : overview_item->GetWindows()) {
CHECK(window);
if (window == GetDefaultSnappedWindow()) {
continue;
}
std::optional<float> snap_ratio = ComputeAutoSnapRatio(window);
if (!snap_ratio.has_value()) {
continue;
}
const bool was_active =
overview_session->IsWindowActiveWindowBeforeOverview(window);
// Remove the overview item before snapping because the overview session
// is unavailable to retrieve outside this function after
// OnOverviewEnding is notified.
overview_item->RestoreWindow(/*reset_transform=*/false,
/*animate=*/true);
overview_session->RemoveItem(overview_item.get());
SnapWindow(window,
(default_snap_position_ == SnapPosition::kPrimary)
? SnapPosition::kSecondary
: SnapPosition::kPrimary,
WindowSnapActionSource::kAutoSnapInSplitView,
/*activate_window=*/false, *snap_ratio);
if (was_active) {
wm::ActivateWindow(window);
}
// If ending overview causes a window to snap, also do not do exiting
// overview animation.
overview_session->SetWindowListNotAnimatedWhenExiting(root_window_);
return;
}
}
// The overview grid has at least one window, but has none that can be snapped
// in split view. If overview is ending because of switching between virtual
// desks, then there is no need to do anything here. Otherwise, end split view
// and show the cannot snap toast.
if (DesksController::Get()->AreDesksBeingModified()) {
return;
}
EndSplitView();
ShowAppCannotSnapToast();
}
void SplitViewController::OnOverviewModeEnded() {
DCHECK(InSplitViewMode());
if (InClamshellSplitViewMode()) {
EndSplitView();
}
}
void SplitViewController::OnDisplaysRemoved(
const display::Displays& removed_displays) {
// If the `root_window_`is the root window of the display which is going to
// be removed, there's no need to start overview.
if (GetRootWindowSettings(root_window_)->display_id ==
display::kInvalidDisplayId) {
// Explicitly destroy the metrics controller here. If the display is removed
// while a desk switch is in progress, the metrics controller will try to
// access the non-existent root window in its desk activation obserer. Note
// that `this` is soon going to be destroyed anyway.
split_view_metrics_controller_.reset();
return;
}
// If we are in tablet split view with only one snapped window, make sure we
// are in overview (see https://crbug.com/1027179).
if (state_ == State::kPrimarySnapped || state_ == State::kSecondarySnapped) {
aura::Window* window =
primary_window_ ? primary_window_ : secondary_window_;
// `WindowSnapActionSource::kNotSpecified` is used as the snap source since
// this is not user-initiated action.
RootWindowController::ForWindow(window)->StartSplitViewOverviewSession(
window, OverviewStartAction::kSplitView,
OverviewEnterExitType::kImmediateEnter,
WindowSnapActionSource::kNotSpecified);
}
}
void SplitViewController::OnDisplayMetricsChanged(
const display::Display& display,
uint32_t metrics) {
// Avoid |ScreenAsh::GetDisplayNearestWindow|, which has a |DCHECK| that fails
// if the display is being deleted. Use |GetRootWindowSettings| directly, and
// if the display is being deleted, we will get |display::kInvalidDisplayId|.
if (GetRootWindowSettings(root_window_)->display_id != display.id())
return;
// We need to update |is_previous_layout_right_side_up_| even if split view
// mode is not active.
const bool is_previous_layout_right_side_up =
is_previous_layout_right_side_up_;
is_previous_layout_right_side_up_ = IsLayoutPrimary(display);
if (!InSplitViewMode())
return;
// If one of the snapped windows becomes unsnappable, end the split view mode
// directly if `IsUserSessionBlocked()`.
if ((primary_window_ && !CanKeepCurrentSnapRatio(primary_window_)) ||
(secondary_window_ && !CanKeepCurrentSnapRatio(secondary_window_))) {
if (!Shell::Get()->session_controller()->IsUserSessionBlocked())
EndSplitView();
return;
}
// In clamshell split view mode, the divider position will be adjusted in
// `OnWindowBoundsChanged`. Also when we first enter tablet mode, the divider
// has not been created yet but there may be a work area change.
if (!InTabletMode() || !split_view_divider_.divider_widget()) {
return;
}
// Before adjusting the divider position for the new display metrics, if the
// divider is animating to a snap position, then stop it and shove it there.
// Postpone `EndSplitViewAfterResizingAtEdgeIfAppropriate()` until after the
// adjustment, because the new display metrics will be used to compare the
// divider position against the edges of the screen.
if (IsDividerAnimating()) {
StopAndShoveAnimatedDivider();
EndResizeWithDividerImpl();
}
// If we ended split view in `EndSplitViewAfterResizingAtEdgeIfAppropriate()`,
// no need to update the divider position.
// TODO(b/329325825): Consider refactoring clamshell display change here.
if (!InTabletSplitViewMode()) {
return;
}
if ((metrics & display::DisplayObserver::DISPLAY_METRIC_ROTATION) ||
(metrics & display::DisplayObserver::DISPLAY_METRIC_WORK_AREA)) {
// Set default `divider_closest_ratio_` to kFixedPositionRatios[1].
if (std::isnan(divider_closest_ratio_))
divider_closest_ratio_ = kFixedPositionRatios[1];
// Reverse the position ratio if top/left window changes.
if (is_previous_layout_right_side_up != IsLayoutPrimary(display))
divider_closest_ratio_ = 1.f - divider_closest_ratio_;
split_view_divider_.SetDividerPosition(
static_cast<int>(divider_closest_ratio_ *
GetDividerPositionUpperLimit(root_window_)) -
kSplitviewDividerShortSideLength / 2);
}
// For other display configuration changes, we only move the divider to the
// closest fixed position.
if (!IsResizingWithDivider()) {
split_view_divider_.SetDividerPosition(
GetClosestFixedDividerPosition(GetDividerPosition()));
}
EndSplitViewAfterResizingAtEdgeIfAppropriate();
NotifyDividerPositionChanged();
UpdateSnappedWindowsAndDividerBounds();
}
void SplitViewController::OnDisplayTabletStateChanged(
display::TabletState state) {
switch (state) {
case display::TabletState::kInClamshellMode:
OnTabletModeEnded();
break;
case display::TabletState::kEnteringTabletMode:
break;
case display::TabletState::kInTabletMode:
OnTabletModeStarted();
break;
case display::TabletState::kExitingTabletMode:
OnTabletModeEnding();
break;
}
}
void SplitViewController::OnAccessibilityStatusChanged() {
// TODO(crubg.com/853588): Exit split screen if ChromeVox is turned on until
// they are compatible.
if (InTabletMode() &&
Shell::Get()->accessibility_controller()->spoken_feedback().enabled()) {
EndSplitView();
}
}
void SplitViewController::OnAccessibilityControllerShutdown() {
Shell::Get()->accessibility_controller()->RemoveObserver(this);
}
void SplitViewController::OnKeyboardOccludedBoundsChanged(
const gfx::Rect& screen_bounds) {
// The window only needs to be moved if it is in the portrait mode.
if (IsLayoutHorizontal(root_window_))
return;
// We only modify the bottom window if there is one and the current active
// input field is in the bottom window.
aura::Window* bottom_window = GetPhysicallyRightOrBottomWindow();
if (!bottom_window &&
!bottom_window->Contains(window_util::GetActiveWindow())) {
return;
}
// If the virtual keyboard is disabled, restore to original layout.
if (screen_bounds.IsEmpty()) {
UpdateSnappedWindowsAndDividerBounds();
return;
}
// Get current active input field.
auto* text_input_client = GetCurrentInputMethod()->GetTextInputClient();
if (!text_input_client) {
return;
}
const gfx::Rect caret_bounds = text_input_client->GetCaretBounds();
if (caret_bounds == gfx::Rect()) {
return;
}
// Move the bottom window if the caret is less than `kMinCaretKeyboardDist`
// dip above the upper bounds of the virtual keyboard.
const int keyboard_occluded_y = screen_bounds.y();
if (keyboard_occluded_y - caret_bounds.bottom() > kMinCaretKeyboardDist)
return;
// Move bottom window above the virtual keyboard but the upper bounds cannot
// exceeds `kMinDividerPositionRatio` of the screen height.
gfx::Rect bottom_bounds = bottom_window->GetBoundsInScreen();
const gfx::Rect work_area =
screen_util::GetDisplayWorkAreaBoundsInScreenForActiveDeskContainer(
root_window_);
const int y =
std::max(keyboard_occluded_y - bottom_bounds.height(),
static_cast<int>(work_area.y() +
work_area.height() * kMinDividerPositionRatio));
bottom_bounds.set_y(y);
bottom_bounds.set_height(keyboard_occluded_y - y);
// Set bottom window bounds.
{
base::AutoReset<bool> enable_bounds_change(&changing_bounds_by_vk_, true);
bottom_window->SetBoundsInScreen(
bottom_bounds,
display::Screen::GetScreen()->GetDisplayNearestWindow(root_window_));
}
split_view_divider_.OnKeyboardOccludedBoundsChangedInPortrait(work_area, y);
}
void SplitViewController::OnWindowActivated(ActivationReason reason,
aura::Window* gained_active,
aura::Window* lost_active) {
// If the bottom window is moved for the virtual keyboard (the split view
// divider bar is unadjustable), when the bottom window lost active, restore
// to the original layout.
if (!split_view_divider_.divider_widget() ||
split_view_divider_.IsAdjustable()) {
return;
}
if (IsLayoutHorizontal(root_window_)) {
return;
}
aura::Window* bottom_window = GetPhysicallyRightOrBottomWindow();
if (!bottom_window)
return;
if (bottom_window->Contains(lost_active) &&
!bottom_window->Contains(gained_active)) {
UpdateSnappedWindowsAndDividerBounds();
}
}
aura::Window* SplitViewController::GetRootWindow() const {
return root_window_;
}
void SplitViewController::StartResizeWithDivider(
const gfx::Point& location_in_screen) {
base::RecordAction(base::UserMetricsAction("SplitView_ResizeWindows"));
if (state_ == State::kBothSnapped) {
presentation_time_recorder_ = CreatePresentationTimeHistogramRecorder(
split_view_divider_.divider_widget()->GetCompositor(),
kTabletSplitViewResizeMultiHistogram,
kTabletSplitViewResizeMultiMaxLatencyHistogram);
return;
}
// An ARC++ window may have snapped window state but not started overview yet.
if (!IsInOverviewSession()) {
return;
}
if (GetOverviewSession()->GetGridWithRootWindow(root_window_)->empty()) {
presentation_time_recorder_ = CreatePresentationTimeHistogramRecorder(
split_view_divider_.divider_widget()->GetCompositor(),
kTabletSplitViewResizeSingleHistogram,
kTabletSplitViewResizeSingleMaxLatencyHistogram);
} else {
presentation_time_recorder_ = CreatePresentationTimeHistogramRecorder(
split_view_divider_.divider_widget()->GetCompositor(),
kTabletSplitViewResizeWithOverviewHistogram,
kTabletSplitViewResizeWithOverviewMaxLatencyHistogram);
}
accumulated_drag_time_ticks_ = base::TimeTicks::Now();
accumulated_drag_distance_ = 0;
tablet_resize_mode_ = TabletResizeMode::kNormal;
}
void SplitViewController::UpdateResizeWithDivider(
const gfx::Point& location_in_screen) {
// This updates `tablet_resize_mode_` based on drag speed.
UpdateTabletResizeMode(base::TimeTicks::Now(), location_in_screen);
NotifyDividerPositionChanged();
UpdateSnappedWindowsBounds();
// Update the resize backdrop, as well as the black scrim layer's bounds and
// opacity.
// TODO(b/298515546): Add performant resizing pattern.
UpdateResizeBackdrop();
UpdateBlackScrim(location_in_screen);
// Apply window transform if necessary.
SetWindowsTransformDuringResizing();
}
bool SplitViewController::EndResizeWithDivider(
const gfx::Point& location_in_screen) {
NotifyDividerPositionChanged();
// Need to update snapped windows bounds even if the split view mode may have
// to exit. Otherwise it's possible for a snapped window stuck in the edge of
// of the screen while overview mode is active.
UpdateSnappedWindowsBounds();
NotifyWindowResized();
presentation_time_recorder_.reset();
// TODO(xdai): Use fade out animation instead of just removing it.
black_scrim_layer_.reset();
resize_timer_.Stop();
tablet_resize_mode_ = TabletResizeMode::kNormal;
const int divider_position = GetDividerPosition();
const int target_divider_position =
GetClosestFixedDividerPosition(divider_position);
// TODO(b/298515283): Separate Snap Group and tablet resize.
if (divider_position == target_divider_position ||
IsSnapGroupEnabledInClamshellMode()) {
return true;
}
divider_snap_animation_ = std::make_unique<DividerSnapAnimation>(
this, divider_position, target_divider_position,
base::Milliseconds(300), gfx::Tween::EASE_IN);
divider_snap_animation_->Show();
return false;
}
void SplitViewController::OnResizeEnding() {
CHECK(InSplitViewMode());
// The backdrop layers are removed here (rather than in
// `EndResizeWithDivider()`) since they may be used while the divider is
// animating to a snapped position.
left_resize_backdrop_layer_.reset();
right_resize_backdrop_layer_.reset();
// Resize may not end with `EndResizeWithDivider()`, so make sure to clear
// here too.
resize_timer_.Stop();
presentation_time_recorder_.reset();
RestoreWindowsTransformAfterResizing();
}
void SplitViewController::OnResizeEnded() {
EndSplitViewAfterResizingAtEdgeIfAppropriate();
}
void SplitViewController::SwapWindows() {
DCHECK(InSplitViewMode());
// Ignore `IsResizingWithDivider()` because it will be true in case of
// double tapping (not double clicking) the divider without ever actually
// dragging it anywhere. Double tapping the divider triggers
// StartResizeWithDivider(), EndResizeWithDivider(), StartResizeWithDivider(),
// SwapWindows(), EndResizeWithDivider(). Double clicking the divider
// (possible by using the emulator or chrome://flags/#force-tablet-mode)
// triggers StartResizeWithDivider(), EndResizeWithDivider(),
// StartResizeWithDivider(), EndResizeWithDivider(), SwapWindows(). Those two
// sequences of function calls are what were mainly considered in writing the
// condition for bailing out here, to disallow swapping windows when the
// divider is being dragged or is animating.
if (IsDividerAnimating()) {
return;
}
SwapWindowsAndUpdateBounds();
if (IsSnapped(primary_window_)) {
TriggerWMEventToSnapWindow(WindowState::Get(primary_window_),
WM_EVENT_SNAP_PRIMARY);
}
if (IsSnapped(secondary_window_)) {
TriggerWMEventToSnapWindow(WindowState::Get(secondary_window_),
WM_EVENT_SNAP_SECONDARY);
}
// Update `default_snap_position_` if necessary.
if (!primary_window_ || !secondary_window_) {
default_snap_position_ =
primary_window_ ? SnapPosition::kPrimary : SnapPosition::kSecondary;
}
split_view_divider_.SetDividerPosition(
GetClosestFixedDividerPosition(GetDividerPosition()));
UpdateStateAndNotifyObservers();
NotifyWindowSwapped();
base::RecordAction(
base::UserMetricsAction("SplitView_DoubleTapDividerSwapWindows"));
}
gfx::Rect SplitViewController::GetSnappedWindowBoundsInScreen(
SnapPosition snap_position,
aura::Window* window_for_minimum_size,
float snap_ratio,
bool account_for_divider_width) const {
if (snap_position == SnapPosition::kNone) {
return screen_util::GetDisplayWorkAreaBoundsInScreenForActiveDeskContainer(
root_window_);
}
const bool should_use_window_bounds_in_fast_resize =
g_use_fast_resize_for_testing ||
(IsResizingWithDivider() &&
tablet_resize_mode_ == TabletResizeMode::kFast);
if (window_for_minimum_size && should_use_window_bounds_in_fast_resize) {
gfx::Rect bounds_in_screen(window_for_minimum_size->GetTargetBounds());
wm::ConvertRectToScreen(root_window_, &bounds_in_screen);
return bounds_in_screen;
}
const int divider_position =
split_view_divider_.HasDividerWidget()
? GetDividerPosition()
: CalculateDividerPosition(root_window_, snap_position, snap_ratio,
account_for_divider_width);
return CalculateSnappedWindowBoundsInScreen(
snap_position, root_window_, window_for_minimum_size,
account_for_divider_width, divider_position, IsResizingWithDivider());
}
SnapPosition SplitViewController::GetPositionOfSnappedWindow(
const aura::Window* window) const {
DCHECK(IsWindowInSplitView(window));
return window == primary_window_ ? SnapPosition::kPrimary
: SnapPosition::kSecondary;
}
void SplitViewController::SetUseFastResizeForTesting(bool val) {
g_use_fast_resize_for_testing = val;
}
aura::Window* SplitViewController::GetPhysicallyLeftOrTopWindow() {
DCHECK(root_window_);
return IsLayoutPrimary(root_window_) ? primary_window_.get()
: secondary_window_.get();
}
aura::Window* SplitViewController::GetPhysicallyRightOrBottomWindow() {
DCHECK(root_window_);
return IsLayoutPrimary(root_window_) ? secondary_window_.get()
: primary_window_.get();
}
void SplitViewController::StartObserving(aura::Window* window) {
if (window && !window->HasObserver(this)) {
Shell::Get()->shadow_controller()->UpdateShadowForWindow(window);
window->AddObserver(this);
WindowState::Get(window)->AddObserver(this);
}
// Note `this` may already be observing `window`, but the divider isn't, i.e.
// during clamshell <-> tablet split view transition.
if (InTabletMode()) {
split_view_divider_.MaybeAddObservedWindow(window);
}
}
void SplitViewController::StopObserving(SnapPosition snap_position) {
aura::Window* window = GetSnappedWindow(snap_position);
if (window == primary_window_) {
primary_window_ = nullptr;
} else {
secondary_window_ = nullptr;
}
if (window && window->HasObserver(this)) {
window->RemoveObserver(this);
WindowState::Get(window)->RemoveObserver(this);
// Must be called after we reset `primary_window_|secondary_window_`.
split_view_divider_.MaybeRemoveObservedWindow(window);
Shell::Get()->shadow_controller()->UpdateShadowForWindow(window);
// It's possible that when we try to snap an ARC app window, while we are
// waiting for its state/bounds to the expected state/bounds, another window
// snap request comes in and causing the previous to-be-snapped window to
// be un-observed, in this case we should restore the previous to-be-snapped
// window's transform if it's unidentity.
RestoreTransformIfApplicable(window);
}
}
void SplitViewController::UpdateStateAndNotifyObservers() {
const State previous_state = state_;
if (IsSnapped(primary_window_) && IsSnapped(secondary_window_)) {
state_ = State::kBothSnapped;
} else if (IsSnapped(primary_window_)) {
state_ = State::kPrimarySnapped;
} else if (IsSnapped(secondary_window_)) {
state_ = State::kSecondarySnapped;
} else {
state_ = State::kNoSnap;
}
// We still notify observers even if |state_| doesn't change as it's possible
// to snap a window to a position that already has a snapped window. However,
// |previous_state| and |state_| cannot both be |State::kNoSnap|.
// When |previous_state| is |State::kNoSnap|, it indicates to
// observers that split view mode started. Likewise, when |state_| is
// |State::kNoSnap|, it indicates to observers that split view mode
// ended.
DCHECK(previous_state != State::kNoSnap || state_ != State::kNoSnap ||
end_reason_ == EndReason::kSnapGroups);
for (auto& observer : observers_) {
observer.OnSplitViewStateChanged(previous_state, state_);
}
const bool was_in_split_view = previous_state != State::kNoSnap;
const bool is_in_split_view = InSplitViewMode();
// If we just started split view, add observers. Don't do this unless we just
// started split view to avoid adding observers twice.
if (!was_in_split_view && is_in_split_view) {
Shell* shell = Shell::Get();
// Add observers when the split view mode starts.
shell->AddShellObserver(this);
OverviewController::Get()->AddObserver(this);
keyboard::KeyboardUIController::Get()->AddObserver(this);
shell->activation_client()->AddObserver(this);
auto_snap_controller_ = std::make_unique<AutoSnapController>(root_window_);
}
// If we are ending split view, ensure that `EndSplitView()` has been called
// to remove the observers and `auto_snap_controller_` has been destroyed.
// Note this assumes that `auto_snap_controller_` is always destroyed in the
// same scope that observers are removed.
if (was_in_split_view && !is_in_split_view) {
CHECK(!auto_snap_controller_);
}
}
void SplitViewController::NotifyDividerPositionChanged() {
for (auto& observer : observers_) {
observer.OnSplitViewDividerPositionChanged();
}
}
void SplitViewController::NotifyWindowResized() {
for (auto& observer : observers_) {
observer.OnSplitViewWindowResized();
}
}
void SplitViewController::NotifyWindowSwapped() {
for (auto& observer : observers_)
observer.OnSplitViewWindowSwapped();
}
void SplitViewController::UpdateBlackScrim(
const gfx::Point& location_in_screen) {
DCHECK(InSplitViewMode());
if (!black_scrim_layer_) {
// Create an invisible black scrim layer.
black_scrim_layer_ = std::make_unique<ui::Layer>(ui::LAYER_SOLID_COLOR);
black_scrim_layer_->SetColor(AshColorProvider::Get()->GetBackgroundColor());
// Set the black scrim layer underneath split view divider.
auto* divider_layer = split_view_divider_.GetDividerWindow()->layer();
auto* divider_parent_layer = divider_layer->parent();
divider_parent_layer->Add(black_scrim_layer_.get());
divider_parent_layer->StackBelow(black_scrim_layer_.get(), divider_layer);
}
// Decide where the black scrim should show and update its bounds.
SnapPosition position = GetBlackScrimPosition(location_in_screen);
if (position == SnapPosition::kNone) {
black_scrim_layer_.reset();
return;
}
black_scrim_layer_->SetBounds(GetSnappedWindowBoundsInScreen(
position, /*window_for_minimum_size=*/nullptr,
chromeos::kDefaultSnapRatio, ShouldConsiderDivider()));
// Update its opacity. The opacity increases as it gets closer to the edge of
// the screen.
const int location = IsLayoutHorizontal(root_window_)
? location_in_screen.x()
: location_in_screen.y();
gfx::Rect work_area_bounds =
screen_util::GetDisplayWorkAreaBoundsInScreenForActiveDeskContainer(
root_window_);
if (!IsLayoutHorizontal(root_window_))
work_area_bounds.Transpose();
float opacity = kBlackScrimOpacity;
const float ratio = chromeos::kOneThirdSnapRatio - kBlackScrimFadeInRatio;
const int distance = std::min(std::abs(location - work_area_bounds.x()),
std::abs(work_area_bounds.right() - location));
if (distance > work_area_bounds.width() * ratio) {
opacity -= kBlackScrimOpacity *
(distance - work_area_bounds.width() * ratio) /
(work_area_bounds.width() * kBlackScrimFadeInRatio);
opacity = std::max(opacity, 0.f);
}
black_scrim_layer_->SetOpacity(opacity);
}
void SplitViewController::UpdateResizeBackdrop() {
// Creates a backdrop layer. It is stacked below the snapped window.
auto create_backdrop = [](aura::Window* window) {
auto resize_backdrop_layer =
std::make_unique<ui::Layer>(ui::LAYER_SOLID_COLOR);
ui::Layer* parent = window->layer()->parent();
ui::Layer* stacking_target = window->layer();
parent->Add(resize_backdrop_layer.get());
parent->StackBelow(resize_backdrop_layer.get(), stacking_target);
return resize_backdrop_layer;
};
// Updates the bounds and color of a backdrop.
auto update_backdrop = [this](SnapPosition position, aura::Window* window,
ui::Layer* backdrop) {
backdrop->SetBounds(GetSnappedWindowBoundsInParent(
position, nullptr, chromeos::kDefaultSnapRatio));
backdrop->SetColor(window->GetProperty(
wm::IsActiveWindow(window) ? chromeos::kFrameActiveColorKey
: chromeos::kFrameInactiveColorKey));
};
if (state_ == State::kPrimarySnapped || state_ == State::kBothSnapped) {
if (!left_resize_backdrop_layer_)
left_resize_backdrop_layer_ = create_backdrop(primary_window_);
update_backdrop(SnapPosition::kPrimary, primary_window_,
left_resize_backdrop_layer_.get());
}
if (state_ == State::kSecondarySnapped || state_ == State::kBothSnapped) {
if (!right_resize_backdrop_layer_)
right_resize_backdrop_layer_ = create_backdrop(secondary_window_);
update_backdrop(SnapPosition::kSecondary, secondary_window_,
right_resize_backdrop_layer_.get());
}
}
void SplitViewController::UpdateSnappedWindowBounds(aura::Window* window) {
DCHECK(IsWindowInSplitView(window));
WindowState* window_state = WindowState::Get(window);
if (InTabletMode()) {
if (window_state->is_client_controlled()) {
// TODO(b/264962634): Remove this workaround. Probably, we can rewrite
// `TabletModeWindowState::UpdateWindowPosition` to include this logic.
const gfx::Rect requested_bounds =
TabletModeWindowState::GetBoundsInTabletMode(window_state);
const SetBoundsWMEvent event(requested_bounds,
/*animate=*/true);
window_state->OnWMEvent(&event);
} else {
TabletModeWindowState::UpdateWindowPosition(
window_state, WindowState::BoundsChangeAnimationType::kAnimate);
}
} else {
const gfx::Rect requested_bounds = GetSnappedWindowBoundsInParent(
GetPositionOfSnappedWindow(window), window,
window_util::GetSnapRatioForWindow(window));
const SetBoundsWMEvent event(requested_bounds, /*animate=*/true);
window_state->OnWMEvent(&event);
}
}
void SplitViewController::UpdateSnappedWindowsBounds() {
// Update the snapped windows' bounds. If the window is already snapped in the
// correct position, simply update the snap ratio.
if (IsSnapped(primary_window_)) {
UpdateSnappedWindowBounds(primary_window_);
}
if (IsSnapped(secondary_window_)) {
UpdateSnappedWindowBounds(secondary_window_);
}
}
void SplitViewController::UpdateSnappedWindowsAndDividerBounds() {
UpdateSnappedWindowsBounds();
// Update divider's bounds and make it adjustable.
if (split_view_divider_.divider_widget()) {
split_view_divider_.UpdateDividerBounds();
// Make the split view divider adjustable.
split_view_divider_.SetAdjustable(true);
}
}
SnapPosition SplitViewController::GetBlackScrimPosition(
const gfx::Point& location_in_screen) {
const gfx::Rect work_area_bounds =
screen_util::GetDisplayWorkAreaBoundsInScreenForActiveDeskContainer(
root_window_);
if (!work_area_bounds.Contains(location_in_screen))
return SnapPosition::kNone;
gfx::Size primary_window_min_size, secondary_window_min_size;
if (primary_window_ && primary_window_->delegate())
primary_window_min_size = primary_window_->delegate()->GetMinimumSize();
if (secondary_window_ && secondary_window_->delegate())
secondary_window_min_size = secondary_window_->delegate()->GetMinimumSize();
bool right_side_up = IsLayoutPrimary(root_window_);
int divider_upper_limit = GetDividerPositionUpperLimit(root_window_);
// The distance from the current resizing position to the left or right side
// of the screen. Note: left or right side here means the side of the
// |primary_window_| or |secondary_window_|.
int primary_window_distance = 0, secondary_window_distance = 0;
int min_left_length = 0, min_right_length = 0;
if (IsLayoutHorizontal(root_window_)) {
int left_distance = location_in_screen.x() - work_area_bounds.x();
int right_distance = work_area_bounds.right() - location_in_screen.x();
primary_window_distance = right_side_up ? left_distance : right_distance;
secondary_window_distance = right_side_up ? right_distance : left_distance;
min_left_length = primary_window_min_size.width();
min_right_length = secondary_window_min_size.width();
} else {
int top_distance = location_in_screen.y() - work_area_bounds.y();
int bottom_distance = work_area_bounds.bottom() - location_in_screen.y();
primary_window_distance = right_side_up ? top_distance : bottom_distance;
secondary_window_distance = right_side_up ? bottom_distance : top_distance;
min_left_length = primary_window_min_size.height();
min_right_length = secondary_window_min_size.height();
}
if (primary_window_distance <
divider_upper_limit * chromeos::kOneThirdSnapRatio ||
primary_window_distance < min_left_length) {
return SnapPosition::kPrimary;
}
if (secondary_window_distance <
divider_upper_limit * chromeos::kOneThirdSnapRatio ||
secondary_window_distance < min_right_length) {
return SnapPosition::kSecondary;
}
return SnapPosition::kNone;
}
int SplitViewController::GetClosestFixedDividerPosition(int divider_position) {
// The values in |kFixedPositionRatios| represent the fixed position of the
// center of the divider while |GetDividerPosition()| represent the origin of
// the divider rectangle. So, before calling FindClosestFixedPositionRatio,
// extract the center from |GetDividerPosition()|. The result will also be the
// center of the divider, so extract the origin, unless the result is on of
// the endpoints.
int divider_upper_limit = GetDividerPositionUpperLimit(root_window_);
// TODO(b/319334795): Move this function and `divider_closest_ratio_` to
// SplitViewDivider.
divider_closest_ratio_ = FindClosestPositionRatio(
float(divider_position + kSplitviewDividerShortSideLength / 2) /
divider_upper_limit);
int fixed_position = divider_upper_limit * divider_closest_ratio_;
if (divider_closest_ratio_ > 0.f && divider_closest_ratio_ < 1.f) {
fixed_position -= kSplitviewDividerShortSideLength / 2;
}
return std::clamp(fixed_position, 0, divider_upper_limit);
}
void SplitViewController::StopAndShoveAnimatedDivider() {
CHECK(IsDividerAnimating());
StopSnapAnimation();
NotifyDividerPositionChanged();
UpdateSnappedWindowsAndDividerBounds();
}
void SplitViewController::StopSnapAnimation() {
divider_snap_animation_->Stop();
split_view_divider_.SetDividerPosition(
divider_snap_animation_->ending_position());
}
bool SplitViewController::ShouldEndSplitViewAfterResizingAtEdge() {
if (!InTabletSplitViewMode()) {
// `SplitViewDivider::CleanUpWindowResizing()` may be called after a display
// change, after which we have ended split view.
// TODO(sophiewen): Only call `SplitViewDivider::CleanUpWindowResizing()` if
// we actually ended resizing.
return false;
}
const int divider_position = GetDividerPosition();
return divider_position == 0 ||
divider_position == GetDividerPositionUpperLimit(root_window_);
}
void SplitViewController::EndSplitViewAfterResizingAtEdgeIfAppropriate() {
if (!ShouldEndSplitViewAfterResizingAtEdge()) {
return;
}
aura::Window* active_window = GetActiveWindowAfterResizingUponExit();
// Track the window that needs to be put back into the overview list if we
// remain in overview mode.
aura::Window* insert_overview_window = nullptr;
if (IsInOverviewSession()) {
insert_overview_window = GetDefaultSnappedWindow();
}
EndSplitView();
if (active_window) {
Shell::Get()->overview_controller()->EndOverview(
OverviewEndAction::kSplitView);
wm::ActivateWindow(active_window);
} else if (insert_overview_window) {
InsertWindowToOverview(insert_overview_window, /*animate=*/false);
}
}
aura::Window* SplitViewController::GetActiveWindowAfterResizingUponExit() {
DCHECK(InSplitViewMode());
if (!ShouldEndSplitViewAfterResizingAtEdge()) {
return nullptr;
}
return GetDividerPosition() == 0 ? GetPhysicallyRightOrBottomWindow()
: GetPhysicallyLeftOrTopWindow();
}
void SplitViewController::OnWindowSnapped(
aura::Window* window,
std::optional<chromeos::WindowStateType> previous_state,
WindowSnapActionSource snap_action_source) {
RestoreTransformIfApplicable(window);
// We must add snap group and end split view before updating state.
if (IsSnapGroupEnabledInClamshellMode()) {
if (SnapGroupController::Get()->OnWindowSnapped(window,
snap_action_source)) {
// Detaching the snapped window will end split view so no need to
// update state and notify observers again.
OnSnappedWindowDetached(window, WindowDetachedReason::kAddedToSnapGroup);
CHECK(!InSplitViewMode());
return;
}
}
UpdateStateAndNotifyObservers();
// If the snapped window was removed from overview and was the active window
// before entering overview, it should be the active window after snapping
// in splitview.
if (to_be_activated_window_ == window) {
to_be_activated_window_ = nullptr;
wm::ActivateWindow(window);
}
// In tablet mode, if the window was previously floated, the other side is
// available, and there is another non-minimized window, do not enter
// overview but instead snap that window to the opposite side.
if (InTabletMode() && previous_state &&
*previous_state == chromeos::WindowStateType::kFloated &&
state_ != State::kBothSnapped) {
for (aura::Window* mru_window :
Shell::Get()->mru_window_tracker()->BuildWindowForCycleList(
kActiveDesk)) {
auto* window_state = WindowState::Get(mru_window);
if (mru_window != window && !window_state->IsMinimized() &&
window_state->CanSnap()) {
const SnapPosition snap_position =
GetPositionOfSnappedWindow(window) == SnapPosition::kPrimary
? SnapPosition::kSecondary
: SnapPosition::kPrimary;
WindowSnapWMEvent event(snap_position == SnapPosition::kPrimary
? WM_EVENT_SNAP_PRIMARY
: WM_EVENT_SNAP_SECONDARY,
WindowSnapActionSource::kAutoSnapInSplitView);
WindowState::Get(mru_window)->OnWMEvent(&event);
return;
}
}
}
if (WillStartPartialOverview(window)) {
if (!InTabletMode()) {
base::RecordAction(
base::UserMetricsAction("SnapGroups_StartPartialOverview"));
}
RootWindowController::ForWindow(window)->StartSplitViewOverviewSession(
window, overview_start_action_, enter_exit_overview_type_,
snap_action_source);
overview_start_action_.reset();
enter_exit_overview_type_.reset();
return;
}
// If we are in clamshell and did *not* start partial overview, which may
// happen if there is an opposite snapped window not in split view, end
// split view, except for the following cases:
// 1. Partial overview may already be in session, i.e. if the window snapped
// in partial overview swaps snap positions via the window layout menu.
// 2. During tablet -> clamshell transition, we do not end split view since
// it may still be needed by `SnapGroupController` to create a `SnapGroup`.
// Split view will be ended either in `MaybeCreateSnapGroup()` or
// `MaybeEndSplitViewAndOverview()` in `TabletModeWindowManager`.
// TODO(b/327269057): Refactor tablet <-> clamshell transition.
if (!InTabletMode() &&
!RootWindowController::ForWindow(window)->split_view_overview_session() &&
snap_action_source !=
WindowSnapActionSource::kSnapByClamshellTabletTransition) {
base::RecordAction(
base::UserMetricsAction("SnapGroups_SkipFormSnapGroupAfterSnapping"));
EndSplitView(EndReason::kNormal);
return;
}
UpdateSnappedWindowsAndDividerBounds();
}
void SplitViewController::OnSnappedWindowDetached(aura::Window* window,
WindowDetachedReason reason) {
auto iter = snapping_window_transformed_bounds_map_.find(window);
if (iter != snapping_window_transformed_bounds_map_.end()) {
snapping_window_transformed_bounds_map_.erase(iter);
}
if (to_be_activated_window_ == window) {
to_be_activated_window_ = nullptr;
}
const bool is_window_moved =
reason == WindowDetachedReason::kWindowMovedToAnotherDisplay;
const bool is_window_destroyed_or_moved =
reason == WindowDetachedReason::kWindowDestroyed || is_window_moved;
const SnapPosition position_of_snapped_window =
GetPositionOfSnappedWindow(window);
// Detach it from splitview first if the window is to be destroyed to prevent
// unnecessary bounds/state update to it when ending splitview resizing. For
// the window that is not going to be destroyed, we still need its bounds and
// state to be updated to match the updated divider position before detaching
// it from splitview.
if (is_window_destroyed_or_moved) {
StopObserving(position_of_snapped_window);
}
// Stop resizing if one of the snapped window is detached from split
// view.
const bool is_divider_animating = IsDividerAnimating();
if (IsResizingWithDivider() || is_divider_animating) {
if (is_divider_animating) {
StopAndShoveAnimatedDivider();
}
EndResizeWithDividerImpl();
}
if (!is_window_destroyed_or_moved) {
StopObserving(position_of_snapped_window);
}
// End the Split View mode for the following two cases:
// 1. If there is no snapped window at this moment;
// 2. In Clamshell partial overview, `SplitViewController` will no longer
// manage the window on one window detached.
auto should_end_split_view = [&]() -> bool {
if (!primary_window_ && !secondary_window_) {
return true;
}
return InClamshellSplitViewMode() &&
(!primary_window_ || !secondary_window_);
};
if (should_end_split_view()) {
EndReason end_reason = EndReason::kNormal;
switch (reason) {
case WindowDetachedReason::kWindowDragged:
end_reason = EndReason::kWindowDragStarted;
break;
case WindowDetachedReason::kAddedToSnapGroup:
end_reason = EndReason::kSnapGroups;
break;
default:
break;
}
EndSplitView(end_reason);
if (is_window_moved) {
// If the snapped window is being moved to another display, end overview.
Shell::Get()->overview_controller()->EndOverview(
OverviewEndAction::kSplitView);
}
} else {
DCHECK(InTabletSplitViewMode());
aura::Window* other_window =
GetSnappedWindow(position_of_snapped_window == SnapPosition::kPrimary
? SnapPosition::kSecondary
: SnapPosition::kPrimary);
if (reason == WindowDetachedReason::kWindowFloated || is_window_moved) {
// Maximize the other window, which will end split view.
WMEvent event(WM_EVENT_MAXIMIZE);
WindowState::Get(other_window)->OnWMEvent(&event);
return;
}
// If there is still one snapped window after minimizing/closing one snapped
// window, update its snap state and open overview window grid.
default_snap_position_ =
primary_window_ ? SnapPosition::kPrimary : SnapPosition::kSecondary;
UpdateStateAndNotifyObservers();
// `WindowSnapActionSource::kNotSpecified` is used as the snap source since
// this is not user-initiated action.
RootWindowController::ForWindow(other_window)
->StartSplitViewOverviewSession(
other_window, OverviewStartAction::kFasterSplitScreenSetup,
reason == WindowDetachedReason::kWindowDragged
? OverviewEnterExitType::kImmediateEnter
: OverviewEnterExitType::kNormal,
WindowSnapActionSource::kNotSpecified);
}
}
void SplitViewController::ModifyPositionRatios(
std::vector<float>& out_position_ratios) {
const bool landscape = IsCurrentScreenOrientationLandscape();
const int min_left_size =
GetMinimumWindowLength(GetPhysicallyLeftOrTopWindow(), landscape);
const int min_right_size =
GetMinimumWindowLength(GetPhysicallyRightOrBottomWindow(), landscape);
const int divider_upper_limit = GetDividerPositionUpperLimit(root_window_);
const float min_size_left_ratio =
static_cast<float>(min_left_size) / divider_upper_limit;
const float min_size_right_ratio =
static_cast<float>(min_right_size) / divider_upper_limit;
if (min_size_left_ratio > chromeos::kOneThirdSnapRatio) {
// If `primary_window_` can't fit in 1/3, remove 0.33f divider position.
std::erase(out_position_ratios, chromeos::kOneThirdSnapRatio);
}
if (min_size_right_ratio > chromeos::kOneThirdSnapRatio) {
// If `secondary_window_` can't fit in 1/3, remove 0.67f divider position.
std::erase(out_position_ratios, chromeos::kTwoThirdSnapRatio);
}
// Remove 0.5f if a window cannot be snapped. We can get into this state by
// snapping a window to two thirds.
if (min_size_left_ratio > chromeos::kDefaultSnapRatio ||
min_size_right_ratio > chromeos::kDefaultSnapRatio) {
std::erase(out_position_ratios, chromeos::kDefaultSnapRatio);
}
}
float SplitViewController::FindClosestPositionRatio(float current_ratio) {
float closest_ratio = 0.f;
std::vector<float> position_ratios(
kFixedPositionRatios,
kFixedPositionRatios + std::size(kFixedPositionRatios));
ModifyPositionRatios(position_ratios);
float min_ratio_diff = std::numeric_limits<float>::max();
for (const float ratio : position_ratios) {
const float ratio_diff = std::abs(current_ratio - ratio);
if (ratio_diff < min_ratio_diff) {
min_ratio_diff = ratio_diff;
closest_ratio = ratio;
}
}
return closest_ratio;
}
void SplitViewController::RestoreTransformIfApplicable(aura::Window* window) {
// If the transform of the window has been changed, calculate a good starting
// transform based on its transformed bounds before to be snapped.
auto iter = snapping_window_transformed_bounds_map_.find(window);
if (iter == snapping_window_transformed_bounds_map_.end())
return;
const gfx::Rect item_bounds = iter->second;
snapping_window_transformed_bounds_map_.erase(iter);
// Restore the window's transform first if it's not identity.
if (!window->layer()->GetTargetTransform().IsIdentity()) {
// Calculate the starting transform based on the window's expected snapped
// bounds and its transformed bounds before to be snapped.
const gfx::Rect snapped_bounds = GetSnappedWindowBoundsInScreen(
GetPositionOfSnappedWindow(window), window,
window_util::GetSnapRatioForWindow(window), ShouldConsiderDivider());
const gfx::Transform starting_transform = gfx::TransformBetweenRects(
gfx::RectF(snapped_bounds), gfx::RectF(item_bounds));
SetTransformWithAnimation(window, starting_transform, gfx::Transform());
}
}
void SplitViewController::SetWindowsTransformDuringResizing() {
CHECK(InTabletSplitViewMode() || IsSnapGroupEnabledInClamshellMode());
const int divider_position = GetDividerPosition();
CHECK_GE(divider_position, 0);
aura::Window* left_or_top_window = GetPhysicallyLeftOrTopWindow();
aura::Window* right_or_bottom_window = GetPhysicallyRightOrBottomWindow();
if (left_or_top_window) {
SetWindowTransformDuringResizing(left_or_top_window, divider_position);
}
if (right_or_bottom_window) {
SetWindowTransformDuringResizing(right_or_bottom_window, divider_position);
}
}
void SplitViewController::RestoreWindowsTransformAfterResizing() {
DCHECK(InSplitViewMode());
if (primary_window_)
window_util::SetTransform(primary_window_, gfx::Transform());
if (secondary_window_)
window_util::SetTransform(secondary_window_, gfx::Transform());
if (black_scrim_layer_.get()) {
black_scrim_layer_->SetTransform(gfx::Transform());
}
}
void SplitViewController::SetTransformWithAnimation(
aura::Window* window,
const gfx::Transform& start_transform,
const gfx::Transform& target_transform) {
for (auto* window_iter : GetTransientTreeIterator(window)) {
// Adjust `start_transform` and `target_transform` for the transient child.
const gfx::PointF target_origin =
GetUnionScreenBoundsForWindow(window).origin();
gfx::RectF original_bounds(window_iter->GetTargetBounds());
wm::TranslateRectToScreen(window_iter->parent(), &original_bounds);
const gfx::PointF pivot(target_origin.x() - original_bounds.x(),
target_origin.y() - original_bounds.y());
const gfx::Transform new_start_transform =
TransformAboutPivot(pivot, start_transform);
const gfx::Transform new_target_transform =
TransformAboutPivot(pivot, target_transform);
if (new_start_transform != window_iter->layer()->GetTargetTransform())
window_iter->SetTransform(new_start_transform);
std::vector<ui::ImplicitAnimationObserver*> animation_observers;
if (window_iter == window) {
animation_observers.push_back(
new WindowTransformAnimationObserver(window));
// If the overview exit animation is in progress or is about to start, add
// the |window| snap animation as one of the animations to be completed
// before |OverviewController::OnEndingAnimationComplete| should be called
// to unpause occlusion tracking, unblur the wallpaper, etc.
OverviewController* overview_controller = OverviewController::Get();
OverviewSession* overview_session =
overview_controller->overview_session();
if (overview_controller->IsCompletingShutdownAnimations() ||
(overview_session && overview_session->is_shutting_down() &&
overview_session->enter_exit_overview_type() !=
OverviewEnterExitType::kImmediateExit)) {
auto overview_exit_animation_observer =
std::make_unique<ExitAnimationObserver>();
animation_observers.push_back(overview_exit_animation_observer.get());
overview_controller->AddExitAnimationObserver(
std::move(overview_exit_animation_observer));
}
}
DoSplitviewTransformAnimation(window_iter->layer(),
SPLITVIEW_ANIMATION_SET_WINDOW_TRANSFORM,
new_target_transform, animation_observers);
}
}
void SplitViewController::UpdateSnappingWindowTransformedBounds(
aura::Window* window) {
if (!window->layer()->GetTargetTransform().IsIdentity()) {
snapping_window_transformed_bounds_map_[window] = gfx::ToEnclosedRect(
window_util::GetTransformedBounds(window, /*top_inset=*/0));
}
}
void SplitViewController::InsertWindowToOverview(aura::Window* window,
bool animate) {
if (!window || !GetOverviewSession())
return;
GetOverviewSession()->AddItemInMruOrder(window, /*reposition=*/true, animate,
/*restack=*/true,
/*use_spawn_animation=*/false);
}
void SplitViewController::EndResizeWithDividerImpl() {
split_view_divider_.CleanUpWindowResizing();
}
void SplitViewController::OnResizeTimer() {
if (InSplitViewMode() && split_view_divider_.divider_widget()) {
split_view_divider_.ResizeWithDivider(
split_view_divider_.previous_event_location());
}
}
void SplitViewController::UpdateTabletResizeMode(
base::TimeTicks event_time_ticks,
const gfx::Point& event_location) {
if (!presentation_time_recorder_) {
base::debug::DumpWithoutCrashing();
} else {
presentation_time_recorder_->RequestNext();
}
if (IsLayoutHorizontal(root_window_)) {
accumulated_drag_distance_ += std::abs(
event_location.x() - split_view_divider_.previous_event_location().x());
} else {
accumulated_drag_distance_ += std::abs(
event_location.y() - split_view_divider_.previous_event_location().y());
}
const base::TimeDelta chunk_time_ticks =
event_time_ticks - accumulated_drag_time_ticks_;
// We switch between fast and normal resize mode depending on how fast the
// divider is dragged. This is done in "chunks" by keeping track of how far
// the divider has been dragged. When the chunk gone on for long enough, we
// calculate the drag speed based on `accumulated_drag_distance_` and update
// the resize mode accordingly.
if (chunk_time_ticks >= kSplitViewChunkTime) {
int drag_per_second =
accumulated_drag_distance_ / chunk_time_ticks.InSecondsF();
tablet_resize_mode_ = drag_per_second > kSplitViewThresholdPixelsPerSec
? TabletResizeMode::kFast
: TabletResizeMode::kNormal;
accumulated_drag_time_ticks_ = event_time_ticks;
accumulated_drag_distance_ = 0;
}
// If we are in the fast mode, start a timer that automatically invokes
// `ResizeWithDivider()` after a timeout. This ensure that we can switch back
// to the normal mode if the user stops dragging. Note: if the timer is
// already active, this will simply move the deadline forward.
if (tablet_resize_mode_ == TabletResizeMode::kFast) {
resize_timer_.Start(FROM_HERE, kSplitViewChunkTime, this,
&SplitViewController::OnResizeTimer);
}
}
void SplitViewController::OnTabletModeStarted() {
is_previous_layout_right_side_up_ = IsCurrentScreenOrientationPrimary();
// If splitview is active when tablet mode is starting, create the split view
// divider if not exists and adjust the `GetDividerPosition()` to be one
// of the fixed positions.
if (InSplitViewMode()) {
// The windows would already have been attached before transition, in
// `TabletModeWindowManager::ArrangeWindowsForTabletMode()`.
CHECK(primary_window_ || secondary_window_);
// Take divider width into calculation since divider will always be
// available for tablet split view. Tablet mode only supports the fixed
// divider positions in `kFixedPositionRatios`, so push `divider_position_`
// to the closest fixed ratio.
const int divider_position =
GetClosestFixedDividerPosition(GetEquivalentDividerPosition(
primary_window_ ? primary_window_ : secondary_window_,
/*account_for_divider_width=*/true));
split_view_divider_.SetDividerPosition(divider_position);
UpdateSnappedWindowsAndDividerBounds();
NotifyDividerPositionChanged();
// Ends `SplitViewOverviewSession` if it is currently alive, as
// `SplitViewOverviewSession` is for clamshell only.
RootWindowController* root_window_controller =
RootWindowController::ForWindow(root_window_);
if (root_window_controller->split_view_overview_session()) {
root_window_controller->EndSplitViewOverviewSession(
SplitViewOverviewSessionExitPoint::kTabletConversion);
}
}
}
void SplitViewController::OnTabletModeEnding() {
// `OnTabletModeEnding()` can also be called during test teardown.
const bool is_divider_animating = IsDividerAnimating();
if (IsResizingWithDivider() || is_divider_animating) {
if (is_divider_animating) {
StopAndShoveAnimatedDivider();
}
EndResizeWithDividerImpl();
}
split_view_divider_.SetVisible(false);
}
void SplitViewController::OnTabletModeEnded() {
is_previous_layout_right_side_up_ = true;
}
void SplitViewController::EndWindowDragImpl(
aura::Window* window,
bool is_being_destroyed,
SnapPosition desired_snap_position,
const gfx::Point& last_location_in_screen,
WindowSnapActionSource snap_action_source) {
if (split_view_divider_.divider_widget()) {
split_view_divider_.OnWindowDragEnded();
}
// If the dragged window is to be destroyed, do not try to snap it.
if (is_being_destroyed)
return;
// If dragged window was in overview before or it has been added to overview
// window by dropping on the new selector item, do nothing.
if (GetOverviewSession() && GetOverviewSession()->IsWindowInOverview(window))
return;
if (WindowState::Get(window)->IsFloated()) {
// If a floated window was dragged from shelf and released, don't snap.
return;
}
DCHECK_EQ(root_window_, window->GetRootWindow());
const bool was_splitview_active = InSplitViewMode();
if (desired_snap_position == SnapPosition::kNone) {
if (was_splitview_active) {
// Even though |snap_position| equals |SnapPosition::kNone|, the dragged
// window still needs to be snapped if splitview mode is active at the
// moment.
// Calculate the expected snap position based on the last event
// location. Note if there is already a window at |desired_snap_postion|,
// SnapWindow() will put the previous snapped window in overview.
SnapWindow(window, ComputeSnapPosition(last_location_in_screen),
snap_action_source,
/*activate_window=*/true);
} else {
// Restore the dragged window's transform first if it's not identity. It
// needs to be called before the transformed window's bounds change so
// that its transient children are layout'ed properly (the layout happens
// when window's bounds change).
SetTransformWithAnimation(window, window->layer()->GetTargetTransform(),
gfx::Transform());
OverviewSession* overview_session = GetOverviewSession();
if (overview_session) {
overview_session->SetWindowListNotAnimatedWhenExiting(root_window_);
// Set the overview exit type to kImmediateExit to avoid update bounds
// animation of the windows in overview grid.
overview_session->set_enter_exit_overview_type(
OverviewEnterExitType::kImmediateExit);
}
// Activate the dragged window and end the overview. The dragged window
// will be restored back to its previous state before dragging.
wm::ActivateWindow(window);
Shell::Get()->overview_controller()->EndOverview(
OverviewEndAction::kSplitView);
// Update the dragged window's bounds. It's possible that the dragged
// window's bounds was changed during dragging. Update its bounds after
// the drag ends to ensure it has the right bounds.
TabletModeWindowState::UpdateWindowPosition(
WindowState::Get(window),
WindowState::BoundsChangeAnimationType::kAnimate);
}
} else {
// Note SnapWindow() might put the previous window that was snapped at the
// |desired_snap_position| in overview.
SnapWindow(window, desired_snap_position, snap_action_source,
/*activate_window=*/true);
}
}
void SplitViewController::SwapWindowsAndUpdateBounds() {
gfx::Rect primary_window_bounds =
primary_window_ ? primary_window_->GetBoundsInScreen() : gfx::Rect();
gfx::Rect secondary_window_bounds =
secondary_window_ ? secondary_window_->GetBoundsInScreen() : gfx::Rect();
aura::Window* cached_window = primary_window_;
primary_window_ = secondary_window_;
secondary_window_ = cached_window;
const auto dst_display =
display::Screen::GetScreen()->GetDisplayNearestWindow(root_window_);
if (primary_window_) {
primary_window_->SetBoundsInScreen(secondary_window_bounds, dst_display);
}
if (secondary_window_) {
secondary_window_->SetBoundsInScreen(primary_window_bounds, dst_display);
}
}
} // namespace ash
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