gecko/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"
#include "nsColor.h"
#include "nsRect.h"
class nsIRenderingContext;
class nsGUIEvent;
#define NS_IVIEWOBSERVER_IID \
{ 0xac43a985, 0xcae6, 0x499d, \
{ 0xae, 0x8f, 0x9c, 0x92, 0xec, 0x6f, 0x2c, 0x47 } }
class nsIViewObserver : public nsISupports
{
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_IVIEWOBSERVER_IID)
/* called when the observer needs to paint. This paints the entire
* frame subtree rooted at the view, including frame subtrees from
* subdocuments.
* @param aViewToPaint the view for the widget that is being painted
* @param aDirtyRegion the region to be painted, in the coordinates of
* aViewToPaint
* @param aPaintDefaultBackground just paint the default background,
* don't try to paint any content. This is set when the observer
* needs to paint something, but the view tree is unstable, so it
* must *not* paint, or even examine, the frame subtree rooted at the
* view. (It is, however, safe to inspect the state of the view itself,
* and any associated widget.) The name illustrates the expected behavior,
* which is to paint some default background color over the dirty region.
* @return error status
*/
NS_IMETHOD Paint(nsIView* aDisplayRoot,
nsIView* aViewToPaint,
nsIWidget* aWidgetToPaint,
const nsRegion& aDirtyRegion,
PRBool aPaintDefaultBackground) = 0;
/* called when the observer needs to handle an event
* @param aView - where to start processing the event; the root view,
* or the view that's currently capturing this sort of event; must be a view
* for this presshell
* @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) = 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;
/**
* Dispatch the given synthesized mouse move event, and if
* aFlushOnHoverChange is true, flush layout if :hover changes cause
* any restyles.
*/
NS_IMETHOD_(void) DispatchSynthMouseMove(nsGUIEvent *aEvent,
PRBool aFlushOnHoverChange) = 0;
/**
* If something within aView is capturing the mouse, clear the capture.
* if aView is null, clear the mouse capture no matter what is capturing it.
*/
NS_IMETHOD_(void) ClearMouseCapture(nsIView* aView) = 0;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsIViewObserver, NS_IVIEWOBSERVER_IID)
#endif