gecko-dev/widget/nsIWidgetListener.h

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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozila.org code.
*
* The Initial Developer of the Original Code is Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2011
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsIWidgetListener_h__
#define nsIWidgetListener_h__
#include "nscore.h"
#include "nsGUIEvent.h"
#include "nsIXULWindow.h"
class nsView;
class nsIPresShell;
class nsIWidgetListener
{
public:
/**
* If this listener is for an nsIXULWindow, return it. If this is null, then
* this is likely a listener for a view, which can be determined using
* GetView. If both methods return null, this will be an nsWebBrowser.
*/
virtual nsIXULWindow* GetXULWindow() { return nullptr; }
/**
* If this listener is for an nsView, return it.
*/
virtual nsView* GetView() { return nullptr; }
/**
* Return the presshell for this widget listener.
*/
virtual nsIPresShell* GetPresShell() { return nullptr; }
/**
* Called when a window is moved to location (x, y). Returns true if the
* notification was handled. Coordinates are outer window screen coordinates.
*/
virtual bool WindowMoved(nsIWidget* aWidget, int32_t aX, int32_t aY) { return false; }
/**
* Called when a window is resized to (width, height). Returns true if the
* notification was handled. Coordinates are outer window screen coordinates.
*/
virtual bool WindowResized(nsIWidget* aWidget, int32_t aWidth, int32_t aHeight) { return false; }
/**
* Called when the size mode (minimized, maximized, fullscreen) is changed.
*/
virtual void SizeModeChanged(nsSizeMode sizeMode) { }
/**
* Called when the z-order of the window is changed. Returns true if the
* notification was handled. aPlacement indicates the new z order. If
* placement is nsWindowZRelative, then aRequestBelow should be the
* window to place below. On return, aActualBelow will be set to the
* window actually behind. This generally only applies to Windows.
*/
virtual bool ZLevelChanged(bool aImmediate, nsWindowZ *aPlacement,
nsIWidget* aRequestBelow, nsIWidget** aActualBelow) { return false; }
/**
* Called when the window is activated and focused.
*/
virtual void WindowActivated() { }
/**
* Called when the window is deactivated and no longer focused.
*/
virtual void WindowDeactivated() { }
/**
* Called when the show/hide toolbar button on the Mac titlebar is pressed.
*/
virtual void OSToolbarButtonPressed() { }
/**
* Called when a request is made to close the window. Returns true if the
* notification was handled. Returns true if the notification was handled.
*/
virtual bool RequestWindowClose(nsIWidget* aWidget) { return false; }
/*
* Indicate that a paint is about to occur on this window. This is called
* at a time when it's OK to change the geometry of this widget or of
* other widgets. Must be called before every call to PaintWindow.
*/
virtual void WillPaintWindow(nsIWidget* aWidget) { }
/**
* Paint the specified region of the window. Returns true if the
* notification was handled.
* This is called at a time when it is not OK to change the geometry of
* this widget or of other widgets.
*/
enum {
PAINT_IS_ALTERNATE = 1 << 0 /* We are painting something other than the normal widget */
};
virtual bool PaintWindow(nsIWidget* aWidget, nsIntRegion aRegion, uint32_t aFlags) { return false; }
/**
* Indicates that a paint occurred.
* This is called at a time when it is OK to change the geometry of
* this widget or of other widgets.
* Must be called after every call to PaintWindow.
*/
virtual void DidPaintWindow() { }
/**
* Request that layout schedules a repaint on the next refresh driver tick.
*/
virtual void RequestRepaint() { }
/**
* Handle an event.
*/
virtual nsEventStatus HandleEvent(nsGUIEvent* event, bool useAttachedEvents)
{
return nsEventStatus_eIgnore;
}
};
#endif