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ui/views/win/hwnd_message_handler_delegate.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// 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 "ui/views/views_export.h"
-
-namespace gfx {
-class Canvas;
-class Insets;
-class Path;
-class Point;
-class Size;
-}
-
-namespace ui {
-class Accelerator;
-class KeyEvent;
-class MouseEvent;
-class TouchEvent;
-}
-
-namespace views {
-
-class InputMethod;
-
-// 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:
-  virtual bool IsWidgetWindow() const = 0;
-
-  // TODO(beng): resolve this more satisfactorily vis-a-vis ShouldUseNativeFrame
-  //             to avoid confusion.
-  virtual bool IsUsingCustomFrame() const = 0;
-
-  virtual void SchedulePaint() = 0;
-  virtual void EnableInactiveRendering() = 0;
-  virtual bool IsInactiveRenderingDisabled() = 0;
-
-  virtual bool CanResize() const = 0;
-  virtual bool CanMaximize() const = 0;
-  virtual bool CanMinimize() const = 0;
-  virtual bool CanActivate() 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 bool WillProcessWorkAreaChange() const = 0;
-
-  virtual int GetNonClientComponent(const gfx::Point& point) const = 0;
-  virtual void GetWindowMask(const gfx::Size& size, gfx::Path* 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.
-  virtual bool GetClientAreaInsets(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 void ResetWindowControls() = 0;
-
-  virtual void PaintLayeredWindow(gfx::Canvas* canvas) = 0;
-
-  virtual InputMethod* GetInputMethod() = 0;
-
-  virtual gfx::NativeViewAccessible GetNativeViewAccessible() = 0;
-
-  // Returns true if the window should handle standard system commands, such as
-  // close, minimize, maximize.
-  // TODO(benwells): Remove this once bubbles don't have two widgets
-  // implementing them on non-aura windows. http://crbug.com/189112.
-  virtual bool ShouldHandleSystemCommands() const = 0;
-
-  // TODO(beng): Investigate migrating these methods to On* prefixes once
-  // HWNDMessageHandler is the WindowImpl.
-
-  // Called when another app was activated.
-  virtual void HandleAppDeactivated() = 0;
-
-  // 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(short 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 is changing. |visible| holds the new
-  // state.
-  virtual void HandleVisibilityChanging(bool visible) = 0;
-
-  // Called when the window's visibility changed. |visible| holds the new state.
-  virtual void HandleVisibilityChanged(bool visible) = 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(const ui::MouseEvent& event) = 0;
-
-  // Called when a translated key event is received (i.e. post IME translation.)
-  // Returns true if the event was handled by the delegate.
-  virtual bool HandleKeyEvent(const ui::KeyEvent& event) = 0;
-
-  // Called when an untranslated key event is received (i.e. pre-IME
-  // translation). Returns true if the event was sent to the input method.
-  virtual bool HandleUntranslatedKeyEvent(const ui::KeyEvent& event) = 0;
-
-  // Called when a touch event is received.
-  virtual void HandleTouchEvent(const 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. Returns
-  // true if accelerated painting was performed.
-  virtual bool HandlePaintAccelerated(const gfx::Rect& invalid_rect) = 0;
-
-  // Called to compel the delegate to paint using the software path.
-  virtual void HandlePaint(gfx::Canvas* canvas) = 0;
-
-  // Called to forward a WM_NOTIFY message to the tooltip manager.
-  virtual bool HandleTooltipNotify(int w_param,
-                                   NMHDR* l_param,
-                                   LRESULT* l_result) = 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(const ui::ScrollEvent& event) = 0;
-
-  // Called when the window size is about to change.
-  virtual void HandleWindowSizeChanging() = 0;
-
- protected:
-  virtual ~HWNDMessageHandlerDelegate() {}
-};
-
-}  // namespace views
-
-#endif  // UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_DELEGATE_H_