1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef UI_AURA_WINDOW_DELEGATE_H_ 6 #define UI_AURA_WINDOW_DELEGATE_H_ 7 8 #include "base/compiler_specific.h" 9 #include "base/memory/ref_counted.h" 10 #include "ui/aura/aura_export.h" 11 #include "ui/base/events/event_constants.h" 12 #include "ui/base/events/event_handler.h" 13 #include "ui/gfx/native_widget_types.h" 14 15 namespace gfx { 16 class Canvas; 17 class Path; 18 class Point; 19 class Rect; 20 class Size; 21 } 22 23 namespace ui { 24 class GestureEvent; 25 class KeyEvent; 26 class MouseEvent; 27 class Texture; 28 class TouchEvent; 29 } 30 31 namespace aura { 32 33 // Delegate interface for aura::Window. 34 class AURA_EXPORT WindowDelegate : public ui::EventHandler { 35 public: 36 // Returns the window's minimum size, or size 0,0 if there is no limit. 37 virtual gfx::Size GetMinimumSize() const = 0; 38 39 // Returns the window's maximum size, or size 0,0 if there is no limit. 40 virtual gfx::Size GetMaximumSize() const = 0; 41 42 // Called when the Window's position and/or size changes. 43 virtual void OnBoundsChanged(const gfx::Rect& old_bounds, 44 const gfx::Rect& new_bounds) = 0; 45 46 // Returns the native cursor for the specified point, in window coordinates, 47 // or NULL for the default cursor. 48 virtual gfx::NativeCursor GetCursor(const gfx::Point& point) = 0; 49 50 // Returns the non-client component (see hit_test.h) containing |point|, in 51 // window coordinates. 52 virtual int GetNonClientComponent(const gfx::Point& point) const = 0; 53 54 // Returns true if event handling should descend into |child|. |location| is 55 // in terms of the Window. 56 virtual bool ShouldDescendIntoChildForEventHandling( 57 Window* child, 58 const gfx::Point& location) = 0; 59 60 // Returns true of the window can be focused. 61 virtual bool CanFocus() = 0; 62 63 // Invoked when mouse capture is lost on the window. 64 virtual void OnCaptureLost() = 0; 65 66 // Asks the delegate to paint window contents into the supplied canvas. 67 virtual void OnPaint(gfx::Canvas* canvas) = 0; 68 69 // Called when the window's device scale factor has changed. 70 virtual void OnDeviceScaleFactorChanged(float device_scale_factor) = 0; 71 72 // Called from Window's destructor before OnWindowDestroyed and before the 73 // children have been destroyed and the window has been removed from its 74 // parent. 75 virtual void OnWindowDestroying() = 0; 76 77 // Called when the Window has been destroyed (i.e. from its destructor). This 78 // is called after OnWindowDestroying and after the children have been 79 // deleted and the window has been removed from its parent. 80 // The delegate can use this as an opportunity to delete itself if necessary. 81 virtual void OnWindowDestroyed() = 0; 82 83 // Called when the TargetVisibility() of a Window changes. |visible| 84 // corresponds to the target visibility of the window. See 85 // Window::TargetVisibility() for details. 86 virtual void OnWindowTargetVisibilityChanged(bool visible) = 0; 87 88 // Called from Window::HitTest to check if the window has a custom hit test 89 // mask. It works similar to the views counterparts. That is, if the function 90 // returns true, GetHitTestMask below will be called to get the mask. 91 // Otherwise, Window will hit-test against its bounds. 92 virtual bool HasHitTestMask() const = 0; 93 94 // Called from Window::HitTest to retrieve hit test mask when HasHitTestMask 95 // above returns true. 96 virtual void GetHitTestMask(gfx::Path* mask) const = 0; 97 98 // Called from RecreateLayer() if the layer the window is associated with has 99 // an external texture. 100 virtual scoped_refptr<ui::Texture> CopyTexture() = 0; 101 102 protected: 103 virtual ~WindowDelegate() {} 104 }; 105 106 } // namespace aura 107 108 #endif // UI_AURA_WINDOW_DELEGATE_H_ 109
