ui/views/widget/native_widget_delegate.h

   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_VIEWS_WIDGET_NATIVE_WIDGET_DELEGATE_H_
   6 #define UI_VIEWS_WIDGET_NATIVE_WIDGET_DELEGATE_H_
   7
   8 #include <vector>
   9
  10 #include "ui/events/event_constants.h"
  11 #include "ui/views/views_export.h"
  12
  13 namespace gfx {
  14 class Canvas;
  15 class Path;
  16 class Point;
  17 class Size;
  18 }
  19
  20 namespace ui {
  21 class GestureEvent;
  22 class KeyEvent;
  23 class Layer;
  24 class MouseEvent;
  25 class PaintContext;
  26 class ScrollEvent;
  27 class TouchEvent;
  28 }
  29
  30 namespace views {
  31 class Widget;
  32
  33 namespace internal {
  34
  35 ////////////////////////////////////////////////////////////////////////////////
  36 // NativeWidgetDelegate
  37 //
  38 //  An interface implemented by the object that handles events sent by a
  39 //  NativeWidget implementation.
  40 //
  41 class VIEWS_EXPORT NativeWidgetDelegate {
  42  public:
  43   virtual ~NativeWidgetDelegate() {}
  44
  45   // Returns true if the window is modal.
  46   virtual bool IsModal() const = 0;
  47
  48   // Returns true if the window is a dialog box.
  49   virtual bool IsDialogBox() const = 0;
  50
  51   // Returns true if the window can be activated.
  52   virtual bool CanActivate() const = 0;
  53
  54   virtual bool IsInactiveRenderingDisabled() const = 0;
  55   virtual void EnableInactiveRendering() = 0;
  56
  57   // Called when the activation state of a window has changed.
  58   virtual void OnNativeWidgetActivationChanged(bool active) = 0;
  59
  60   // Called when native focus moves from one native view to another.
  61   virtual void OnNativeFocus() = 0;
  62   virtual void OnNativeBlur() = 0;
  63
  64   // Called when the window is about to be shown/hidden.
  65   virtual void OnNativeWidgetVisibilityChanging(bool visible) = 0;
  66
  67   // Called when the window is shown/hidden.
  68   virtual void OnNativeWidgetVisibilityChanged(bool visible) = 0;
  69
  70   // Called when the native widget is created.
  71   // The |desktop_widget| bool is true for widgets created in the desktop and
  72   // false for widgets created in the shell.
  73   virtual void OnNativeWidgetCreated(bool desktop_widget) = 0;
  74
  75   // Called just before the native widget is destroyed. This is the delegate's
  76   // last chance to do anything with the native widget handle.
  77   virtual void OnNativeWidgetDestroying() = 0;
  78
  79   // Called just after the native widget is destroyed.
  80   virtual void OnNativeWidgetDestroyed() = 0;
  81
  82   // Returns the smallest size the window can be resized to by the user.
  83   virtual gfx::Size GetMinimumSize() const = 0;
  84
  85   // Returns the largest size the window can be resized to by the user.
  86   virtual gfx::Size GetMaximumSize() const = 0;
  87
  88   // Called when the NativeWidget changed position.
  89   virtual void OnNativeWidgetMove() = 0;
  90
  91   // Called when the NativeWidget changed size to |new_size|.
  92   // This may happen at the same time as OnNativeWidgetWindowShowStateChanged,
  93   // e.g. maximize.
  94   virtual void OnNativeWidgetSizeChanged(const gfx::Size& new_size) = 0;
  95
  96   // Called when the NativeWidget changes its window state.
  97   // This may happen at the same time as OnNativeWidgetSizeChanged, e.g.
  98   // maximize.
  99   virtual void OnNativeWidgetWindowShowStateChanged() = 0;
 100
 101   // Called when the user begins/ends to change the bounds of the window.
 102   virtual void OnNativeWidgetBeginUserBoundsChange() = 0;
 103   virtual void OnNativeWidgetEndUserBoundsChange() = 0;
 104
 105   // Returns true if the delegate has a FocusManager.
 106   virtual bool HasFocusManager() const = 0;
 107
 108   // Paints the rootview in the context. This will also refresh the compositor
 109   // tree if necessary.
 110   virtual void OnNativeWidgetPaint(const ui::PaintContext& context) = 0;
 111
 112   // Returns the non-client component (see ui/base/hit_test.h) containing
 113   // |point|, in client coordinates.
 114   virtual int GetNonClientComponent(const gfx::Point& point) = 0;
 115
 116   // Mouse and key event handlers.
 117   virtual void OnKeyEvent(ui::KeyEvent* event) = 0;
 118   virtual void OnMouseEvent(ui::MouseEvent* event) = 0;
 119   virtual void OnMouseCaptureLost() = 0;
 120
 121   virtual void OnScrollEvent(ui::ScrollEvent* event) = 0;
 122   virtual void OnGestureEvent(ui::GestureEvent* event) = 0;
 123
 124   // Runs the specified native command. Returns true if the command is handled.
 125   virtual bool ExecuteCommand(int command_id) = 0;
 126
 127   // Returns the child Layers of the Widgets layer that were created by Views.
 128   virtual const std::vector<ui::Layer*>& GetRootLayers() = 0;
 129
 130   // Returns true if window has a hit-test mask.
 131   virtual bool HasHitTestMask() const = 0;
 132
 133   // Provides the hit-test mask if HasHitTestMask above returns true.
 134   virtual void GetHitTestMask(gfx::Path* mask) const = 0;
 135
 136   //
 137   virtual Widget* AsWidget() = 0;
 138   virtual const Widget* AsWidget() const = 0;
 139
 140   // Sets-up the focus manager with the view that should have focus when the
 141   // window is shown the first time.  It takes the intended |show_state| of the
 142   // window in order to decide whether the window should be focused now or
 143   // later.  Returns true if the initial focus has been set or the window should
 144   // not set the initial focus, or false if the caller should set the initial
 145   // focus (if any).
 146   virtual bool SetInitialFocus(ui::WindowShowState show_state) = 0;
 147 };
 148
 149 }  // namespace internal
 150 }  // namespace views
 151
 152 #endif  // UI_VIEWS_WIDGET_NATIVE_WIDGET_DELEGATE_H_