RetroZilla/view/public/nsIViewObserver.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** 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 mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of 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 nsIViewObserver_h___
#define nsIViewObserver_h___
#include "nsISupports.h"
#include "nsEvent.h"
class nsIRenderingContext;
struct nsRect;
class nsGUIEvent;
#define NS_IVIEWOBSERVER_IID \
{ 0x0f4bc34a, 0xc93b, 0x4699, \
{ 0xb6, 0xc2, 0xb3, 0xca, 0x9e, 0xe4, 0x6c, 0x95 } }
class nsIViewObserver : public nsISupports
{
public:
NS_DEFINE_STATIC_IID_ACCESSOR(NS_IVIEWOBSERVER_IID)
/* called when the observer needs to paint
* @param aRenderingContext - rendering context to paint to
* @param aDirtyRect - rectangle of dirty area
* @return error status
*/
NS_IMETHOD Paint(nsIView * aView,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect) = 0;
/* called when the observer needs to handle an event
* @param aEvent - event notification
* @param aEventStatus - out parameter for event handling
* status
* @param aHandled - whether the correct frame was found to
* handle the event
* @return error status
*/
NS_IMETHOD HandleEvent(nsIView * aView,
nsGUIEvent* aEvent,
nsEventStatus* aEventStatus,
PRBool aForceHandle,
PRBool& aHandled) = 0;
/* called when the view has been resized and the
* content within the view needs to be reflowed.
* @param aWidth - new width of view
* @param aHeight - new height of view
* @return error status
*/
NS_IMETHOD ResizeReflow(nsIView * aView, nscoord aWidth, nscoord aHeight) = 0;
/**
* Hack to find out if the view observer is itself visible, in lieu
* of having the view trees linked.
*/
NS_IMETHOD_(PRBool) IsVisible() = 0;
/**
* Notify the observer that we're about to start painting. This
* gives the observer a chance to make some last-minute invalidates
* and geometry changes if it wants to.
*/
NS_IMETHOD_(void) WillPaint() = 0;
};
#endif