// 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.
#ifndef UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_DELEGATE_H_
#define UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_DELEGATE_H_
#include "base/win/windows_types.h"
#include "ui/base/ui_base_types.h"
#include "ui/gfx/native_widget_types.h"
#include "ui/views/views_export.h"
class SkPath;
namespace gfx {
class Insets;
class Point;
class Rect;
class Size;
} // namespace gfx
namespace ui {
class Accelerator;
class InputMethod;
class KeyEvent;
class MouseEvent;
class ScrollEvent;
class TouchEvent;
class GestureEvent;
} // namespace ui
namespace views {
enum class FrameMode {
SYSTEM_DRAWN, // "glass" frame
SYSTEM_DRAWN_NO_CONTROLS, // "glass" frame but with custom window controls
CUSTOM_DRAWN // "opaque" frame
};
// Implemented by the object that uses the HWNDMessageHandler to handle
// notifications from the underlying HWND and service requests for data.
class VIEWS_EXPORT HWNDMessageHandlerDelegate {
public:
// Returns the input method currently used in this window.
virtual ui::InputMethod* GetHWNDMessageDelegateInputMethod() = 0;
// True if the widget associated with this window has a non-client view.
virtual bool HasNonClientView() const = 0;
// Returns who we want to be drawing the frame. Either the system (Windows)
// will handle it or Chrome will custom draw it.
virtual FrameMode GetFrameMode() const = 0;
// True if a frame should be drawn. This will return true for some windows
// that don't have a visible frame. Those usually have the WS_POPUP style, for
// which Windows will remove the frame automatically if the frame mode is
// SYSTEM_DRAWN.
// TODO(bsep): Investigate deleting this when v2 Apps support is removed.
virtual bool HasFrame() const = 0;
// True if the window should paint as active (regardless of whether it has
// system focus).
virtual bool ShouldPaintAsActive() const = 0;
virtual void SchedulePaint() = 0;
virtual bool CanResize() const = 0;
virtual bool CanMaximize() const = 0;
virtual bool CanMinimize() const = 0;
virtual bool CanActivate() const = 0;
// Returns true if the delegate wants mouse events when inactive and the
// window is clicked and should not become activated. A return value of false
// indicates the mouse events will be dropped.
virtual bool WantsMouseEventsWhenInactive() const = 0;
virtual bool WidgetSizeIsClientSize() const = 0;
// Returns true if the delegate represents a modal window.
virtual bool IsModal() const = 0;
// Returns the show state that should be used for the application's first
// window.
virtual int GetInitialShowState() const = 0;
virtual int GetNonClientComponent(const gfx::Point& point) const = 0;
virtual void GetWindowMask(const gfx::Size& size, SkPath* mask) = 0;
// Returns true if the delegate modifies |insets| to define a custom client
// area for the window, false if the default client area should be used. If
// false is returned, |insets| is not modified. |monitor| is the monitor
// this window is on. Normally that would be determined from the HWND, but
// during WM_NCCALCSIZE Windows does not return the correct monitor for the
// HWND, so it must be passed in explicitly (see HWNDMessageHandler::
// OnNCCalcSize for more details).
virtual bool GetClientAreaInsets(gfx::Insets* insets,
HMONITOR monitor) const = 0;
// Returns true if DWM frame should be extended into client area by |insets|.
// Insets are specified in screen pixels not DIP because that's what DWM uses.
virtual bool GetDwmFrameInsetsInPixels(gfx::Insets* insets) const = 0;
// Returns the minimum and maximum size the window can be resized to by the
// user.
virtual void GetMinMaxSize(gfx::Size* min_size,
gfx::Size* max_size) const = 0;
// Returns the current size of the RootView.
virtual gfx::Size GetRootViewSize() const = 0;
virtual gfx::Size DIPToScreenSize(const gfx::Size& dip_size) const = 0;
virtual void ResetWindowControls() = 0;
virtual gfx::NativeViewAccessible GetNativeViewAccessible() = 0;
// TODO(beng): Investigate migrating these methods to On* prefixes once
// HWNDMessageHandler is the WindowImpl.
// Called when the window was activated or deactivated. |active| reflects the
// new state.
virtual void HandleActivationChanged(bool active) = 0;
// Called when a well known "app command" from the system was performed.
// Returns true if the command was handled.
virtual bool HandleAppCommand(int command) = 0;
// Called from WM_CANCELMODE.
virtual void HandleCancelMode() = 0;
// Called when the window has lost mouse capture.
virtual void HandleCaptureLost() = 0;
// Called when the user tried to close the window.
virtual void HandleClose() = 0;
// Called when a command defined by the application was performed. Returns
// true if the command was handled.
virtual bool HandleCommand(int command) = 0;
// Called when an accelerator is invoked.
virtual void HandleAccelerator(const ui::Accelerator& accelerator) = 0;
// Called when the HWND is created.
virtual void HandleCreate() = 0;
// Called when the HWND is being destroyed, before any child HWNDs are
// destroyed.
virtual void HandleDestroying() = 0;
// Called after the HWND is destroyed, after all child HWNDs have been
// destroyed.
virtual void HandleDestroyed() = 0;
// Called when the HWND is to be focused for the first time. This is called
// when the window is shown for the first time. Returns true if the delegate
// set focus and no default processing should be done by the message handler.
virtual bool HandleInitialFocus(ui::WindowShowState show_state) = 0;
// Called when display settings are adjusted on the system.
virtual void HandleDisplayChange() = 0;
// Called when the user begins or ends a size/move operation using the window
// manager.
virtual void HandleBeginWMSizeMove() = 0;
virtual void HandleEndWMSizeMove() = 0;
// Called when the window's position changed.
virtual void HandleMove() = 0;
// Called when the system's work area has changed.
virtual void HandleWorkAreaChanged() = 0;
// Called when the window's visibility changed. |visible| holds the new state.
virtual void HandleVisibilityChanged(bool visible) = 0;
// Called when a top level window is minimized or restored.
virtual void HandleWindowMinimizedOrRestored(bool restored) = 0;
// Called when the window's client size changed. |new_size| holds the new
// size.
virtual void HandleClientSizeChanged(const gfx::Size& new_size) = 0;
// Called when the window's frame has changed.
virtual void HandleFrameChanged() = 0;
// Called when focus shifted to this HWND from |last_focused_window|.
virtual void HandleNativeFocus(HWND last_focused_window) = 0;
// Called when focus shifted from the HWND to a different window.
virtual void HandleNativeBlur(HWND focused_window) = 0;
// Called when a mouse event is received. Returns true if the event was
// handled by the delegate.
virtual bool HandleMouseEvent(ui::MouseEvent* event) = 0;
// Called when an untranslated key event is received (i.e. pre-IME
// translation).
virtual void HandleKeyEvent(ui::KeyEvent* event) = 0;
// Called when a touch event is received.
virtual void HandleTouchEvent(ui::TouchEvent* event) = 0;
// Called when an IME message needs to be processed by the delegate. Returns
// true if the event was handled and no default processing should be
// performed.
virtual bool HandleIMEMessage(UINT message,
WPARAM w_param,
LPARAM l_param,
LRESULT* result) = 0;
// Called when the system input language changes.
virtual void HandleInputLanguageChange(DWORD character_set,
HKL input_language_id) = 0;
// Called to compel the delegate to paint |invalid_rect| accelerated.
virtual void HandlePaintAccelerated(const gfx::Rect& invalid_rect) = 0;
// Invoked on entering/exiting a menu loop.
virtual void HandleMenuLoop(bool in_menu_loop) = 0;
// Catch-all message handling and filtering. Called before
// HWNDMessageHandler's built-in handling, which may pre-empt some
// expectations in Views/Aura if messages are consumed. Returns true if the
// message was consumed by the delegate and should not be processed further
// by the HWNDMessageHandler. In this case, |result| is returned. |result| is
// not modified otherwise.
virtual bool PreHandleMSG(UINT message,
WPARAM w_param,
LPARAM l_param,
LRESULT* result) = 0;
// Like PreHandleMSG, but called after HWNDMessageHandler's built-in handling
// has run and after DefWindowProc.
virtual void PostHandleMSG(UINT message, WPARAM w_param, LPARAM l_param) = 0;
// Called when a scroll event is received. Returns true if the event was
// handled by the delegate.
virtual bool HandleScrollEvent(ui::ScrollEvent* event) = 0;
// Called when a gesture event is received. Returns true if the event was
// handled by the delegate.
virtual bool HandleGestureEvent(ui::GestureEvent* event) = 0;
// Called when the window size is about to change.
virtual void HandleWindowSizeChanging() = 0;
// Called after HandleWindowSizeChanging() when it's determined the window
// size didn't actually change.
virtual void HandleWindowSizeUnchanged() = 0;
// Called when the window scale factor has changed.
virtual void HandleWindowScaleFactorChanged(float window_scale_factor) = 0;
// Called when the headless window bounds has changed.
virtual void HandleHeadlessWindowBoundsChanged(const gfx::Rect& bounds) = 0;
protected:
virtual ~HWNDMessageHandlerDelegate() = default;
};
} // namespace views
#endif // UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_DELEGATE_H_
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