widget/nsIWidgetListener.h

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  35
  36 #ifndef nsIWidgetListener_h__
  37 #define nsIWidgetListener_h__
  38
  39 #include "nscore.h"
  40 #include "nsGUIEvent.h"
  41 #include "nsIXULWindow.h"
  42
  43 class nsView;
  44 class nsIPresShell;
  45
  46 class nsIWidgetListener
  47 {
  48 public:
  49
  50   /**
  51    * If this listener is for an nsIXULWindow, return it. If this is null, then
  52    * this is likely a listener for a view, which can be determined using
  53    * GetView. If both methods return null, this will be an nsWebBrowser.
  54    */
  55   virtual nsIXULWindow* GetXULWindow() { return nullptr; }
  56
  57   /**
  58    * If this listener is for an nsView, return it.
  59    */
  60   virtual nsView* GetView() { return nullptr; }
  61
  62   /**
  63    * Return the presshell for this widget listener.
  64    */
  65   virtual nsIPresShell* GetPresShell() { return nullptr; }
  66
  67   /**
  68    * Called when a window is moved to location (x, y). Returns true if the
  69    * notification was handled. Coordinates are outer window screen coordinates.
  70    */
  71   virtual bool WindowMoved(nsIWidget* aWidget, int32_t aX, int32_t aY) { return false; }
  72
  73   /**
  74    * Called when a window is resized to (width, height). Returns true if the
  75    * notification was handled. Coordinates are outer window screen coordinates.
  76    */
  77   virtual bool WindowResized(nsIWidget* aWidget, int32_t aWidth, int32_t aHeight) { return false; }
  78
  79   /**
  80    * Called when the size mode (minimized, maximized, fullscreen) is changed.
  81    */
  82   virtual void SizeModeChanged(nsSizeMode sizeMode) { }
  83
  84   /**
  85    * Called when the z-order of the window is changed. Returns true if the
  86    * notification was handled. aPlacement indicates the new z order. If
  87    * placement is nsWindowZRelative, then aRequestBelow should be the
  88    * window to place below. On return, aActualBelow will be set to the
  89    * window actually behind. This generally only applies to Windows.
  90    */
  91   virtual bool ZLevelChanged(bool aImmediate, nsWindowZ *aPlacement,
  92                              nsIWidget* aRequestBelow, nsIWidget** aActualBelow) { return false; }
  93
  94   /**
  95    * Called when the window is activated and focused.
  96    */
  97   virtual void WindowActivated() { }
  98
  99   /**
 100    * Called when the window is deactivated and no longer focused.
 101    */
 102   virtual void WindowDeactivated() { }
 103
 104   /**
 105    * Called when the show/hide toolbar button on the Mac titlebar is pressed.
 106    */
 107   virtual void OSToolbarButtonPressed() { }
 108
 109   /**
 110    * Called when a request is made to close the window. Returns true if the
 111    * notification was handled. Returns true if the notification was handled.
 112    */
 113   virtual bool RequestWindowClose(nsIWidget* aWidget) { return false; }
 114
 115   /*
 116    * Indicate that a paint is about to occur on this window. This is called
 117    * at a time when it's OK to change the geometry of this widget or of
 118    * other widgets. Must be called before every call to PaintWindow.
 119    */
 120   virtual void WillPaintWindow(nsIWidget* aWidget) { }
 121
 122   /**
 123    * Paint the specified region of the window. Returns true if the
 124    * notification was handled.
 125    * This is called at a time when it is not OK to change the geometry of
 126    * this widget or of other widgets.
 127    */
 128   virtual bool PaintWindow(nsIWidget* aWidget, nsIntRegion aRegion) { return false; }
 129
 130   /**
 131    * Indicates that a paint occurred.
 132    * This is called at a time when it is OK to change the geometry of
 133    * this widget or of other widgets.
 134    * Must be called after every call to PaintWindow.
 135    */
 136   virtual void DidPaintWindow() { }
 137
 138   /**
 139    * Request that layout schedules a repaint on the next refresh driver tick.
 140    */
 141   virtual void RequestRepaint() { }
 142
 143   /**
 144    * Handle an event.
 145    */
 146   virtual nsEventStatus HandleEvent(nsGUIEvent* event, bool useAttachedEvents)
 147   {
 148     return nsEventStatus_eIgnore;
 149   }
 150 };
 151
 152 #endif