// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/views/widget/desktop_aura/desktop_drag_drop_client_win.h"
#include <memory>
#include "base/metrics/histogram_macros.h"
#include "base/threading/hang_watcher.h"
#include "ui/base/dragdrop/drag_drop_types.h"
#include "ui/base/dragdrop/drag_source_win.h"
#include "ui/base/dragdrop/drop_target_event.h"
#include "ui/base/dragdrop/mojom/drag_drop_types.mojom-shared.h"
#include "ui/base/dragdrop/os_exchange_data_provider_win.h"
#include "ui/base/win/event_creation_utils.h"
#include "ui/display/win/screen_win.h"
#include "ui/views/widget/desktop_aura/desktop_drop_target_win.h"
#include "ui/views/widget/desktop_aura/desktop_window_tree_host_win.h"
namespace views {
DesktopDragDropClientWin::DesktopDragDropClientWin(
aura::Window* root_window,
HWND window,
DesktopWindowTreeHostWin* desktop_host)
: drag_drop_in_progress_(false),
desktop_host_(desktop_host) {
drop_target_ = new DesktopDropTargetWin(root_window);
drop_target_->Init(window);
}
DesktopDragDropClientWin::~DesktopDragDropClientWin() {
if (drag_drop_in_progress_)
DragCancel();
}
ui::mojom::DragOperation DesktopDragDropClientWin::StartDragAndDrop(
std::unique_ptr<ui::OSExchangeData> data,
aura::Window* root_window,
aura::Window* source_window,
const gfx::Point& screen_location,
int allowed_operations,
ui::mojom::DragEventSource source) {
drag_drop_in_progress_ = true;
gfx::Point touch_screen_point;
if (source == ui::mojom::DragEventSource::kTouch) {
touch_screen_point =
screen_location + source_window->GetBoundsInScreen().OffsetFromOrigin();
source_window->GetHost()->ConvertDIPToPixels(&touch_screen_point);
desktop_host_->StartTouchDrag(touch_screen_point);
// Gesture state gets left in a state where you can't start
// another drag, unless it's cleaned up. Cleaning it up before starting
// drag drop also fixes an issue with getting two kGestureScrollBegin events
// in a row. See crbug.com/1120809.
source_window->CleanupGestureState();
}
base::WeakPtr<DesktopDragDropClientWin> alive(weak_factory_.GetWeakPtr());
drag_source_ = ui::DragSourceWin::Create();
Microsoft::WRL::ComPtr<ui::DragSourceWin> drag_source_copy = drag_source_;
drag_source_copy->set_data(data.get());
ui::OSExchangeDataProviderWin::GetDataObjectImpl(*data)->set_in_drag_loop(
true);
DWORD effect;
// Never consider the current scope as hung. The hang watching deadline (if
// any) is not valid since the user can take unbounded time to complete the
// drag. (http://crbug.com/806174)
base::HangWatcher::InvalidateActiveExpectations();
HRESULT result = ::DoDragDrop(
ui::OSExchangeDataProviderWin::GetIDataObject(*data.get()),
drag_source_.Get(),
ui::DragDropTypes::DragOperationToDropEffect(allowed_operations),
&effect);
if (alive && source == ui::mojom::DragEventSource::kTouch) {
desktop_host_->FinishTouchDrag(touch_screen_point);
// Move the mouse cursor to where the drag drop started, to avoid issues
// when the drop is outside of the Chrome window.
::SetCursorPos(touch_screen_point.x(), touch_screen_point.y());
}
drag_source_copy->set_data(nullptr);
if (alive)
drag_drop_in_progress_ = false;
if (result != DRAGDROP_S_DROP)
effect = DROPEFFECT_NONE;
return ui::PreferredDragOperation(
ui::DragDropTypes::DropEffectToDragOperation(effect));
}
void DesktopDragDropClientWin::DragCancel() {
drag_source_->CancelDrag();
}
bool DesktopDragDropClientWin::IsDragDropInProgress() {
return drag_drop_in_progress_;
}
void DesktopDragDropClientWin::AddObserver(
aura::client::DragDropClientObserver* observer) {
NOTIMPLEMENTED();
}
void DesktopDragDropClientWin::RemoveObserver(
aura::client::DragDropClientObserver* observer) {
NOTIMPLEMENTED();
}
void DesktopDragDropClientWin::OnNativeWidgetDestroying(HWND window) {
if (drop_target_.get()) {
RevokeDragDrop(window);
drop_target_ = nullptr;
}
}
} // namespace views