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104 lines
3.7 KiB
C++
104 lines
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsIViewObserver_h___
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#define nsIViewObserver_h___
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#include "nsISupports.h"
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#include "nsEvent.h"
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class nsIRenderingContext;
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struct nsRect;
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class nsGUIEvent;
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#define NS_IVIEWOBSERVER_IID \
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{ 0x0f4bc34a, 0xc93b, 0x4699, \
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{ 0xb6, 0xc2, 0xb3, 0xca, 0x9e, 0xe4, 0x6c, 0x95 } }
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class nsIViewObserver : public nsISupports
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{
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public:
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NS_DEFINE_STATIC_IID_ACCESSOR(NS_IVIEWOBSERVER_IID)
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/* called when the observer needs to paint
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* @param aRenderingContext - rendering context to paint to
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* @param aDirtyRect - rectangle of dirty area
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* @return error status
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*/
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NS_IMETHOD Paint(nsIView * aView,
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nsIRenderingContext& aRenderingContext,
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const nsRect& aDirtyRect) = 0;
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/* called when the observer needs to handle an event
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* @param aEvent - event notification
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* @param aEventStatus - out parameter for event handling
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* status
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* @param aHandled - whether the correct frame was found to
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* handle the event
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* @return error status
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*/
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NS_IMETHOD HandleEvent(nsIView * aView,
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nsGUIEvent* aEvent,
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nsEventStatus* aEventStatus,
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PRBool aForceHandle,
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PRBool& aHandled) = 0;
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/* called when the view has been resized and the
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* content within the view needs to be reflowed.
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* @param aWidth - new width of view
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* @param aHeight - new height of view
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* @return error status
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*/
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NS_IMETHOD ResizeReflow(nsIView * aView, nscoord aWidth, nscoord aHeight) = 0;
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/**
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* Hack to find out if the view observer is itself visible, in lieu
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* of having the view trees linked.
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*/
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NS_IMETHOD_(PRBool) IsVisible() = 0;
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/**
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* Notify the observer that we're about to start painting. This
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* gives the observer a chance to make some last-minute invalidates
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* and geometry changes if it wants to.
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*/
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NS_IMETHOD_(void) WillPaint() = 0;
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};
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#endif
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