gecko-dev/layout/generic/nsIScrollableFrame.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 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
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* ***** END LICENSE BLOCK ***** */
#ifndef nsIScrollFrame_h___
#define nsIScrollFrame_h___
#include "nsISupports.h"
#include "nsCoord.h"
#include "nsIViewManager.h"
class nsIFrame;
class nsIBox;
class nsIPresContext;
// IID for the nsIScrollableFrame interface
#define NS_ISCROLLABLE_FRAME_IID \
{ 0xc95f1831, 0xc372, 0x11d1, \
{ 0xb7, 0x21, 0x0, 0x64, 0x9, 0x92, 0xd8, 0xc9 } }
class nsIScrollableFrame : public nsISupports {
public:
enum nsScrollPref {
Auto = 0,
NeverScroll,
AlwaysScroll,
AlwaysScrollVertical,
AlwaysScrollHorizontal
};
NS_DEFINE_STATIC_IID_ACCESSOR(NS_ISCROLLABLE_FRAME_IID)
/**
* Set the view that we are scrolling within the scrolling view.
*/
NS_IMETHOD SetScrolledFrame(nsIPresContext* aPresContext,
nsIFrame *aScrolledFrame) = 0;
/**
* Get the view that we are scrolling within the scrollable frame.
* @result child view
*/
NS_IMETHOD GetScrolledFrame(nsIPresContext* aPresContext,
nsIFrame *&aScrolledFrame) const = 0;
/**
* Gets the size of the area that lies inside the scrollbars but clips the scrolled frame
*/
NS_IMETHOD GetClipSize(nsIPresContext* aPresContext,
nscoord *aWidth,
nscoord *aHeight) const = 0;
/**
* Get information about whether the vertical and horizontal scrollbars
* are currently visible
*/
NS_IMETHOD GetScrollbarVisibility(nsIPresContext* aPresContext,
PRBool *aVerticalVisible,
PRBool *aHorizontalVisible) const = 0;
/**
* Query whether scroll bars should be displayed all the time, never or
* only when necessary.
* @return current scrollbar selection
*/
NS_IMETHOD GetScrollPreference(nsIPresContext* aPresContext, nsScrollPref* aScrollPreference) const = 0;
/**
* Gets the size of the area that lies inside the scrollbars but clips the scrolled frame
*/
NS_IMETHOD GetScrollbarSizes(nsIPresContext* aPresContext,
nscoord *aVbarWidth,
nscoord *aHbarHeight) const = 0;
/**
* Get the position of the scrolled view.
*/
NS_IMETHOD GetScrollPosition(nsIPresContext* aContext, nscoord &aX, nscoord& aY) const=0;
/**
* Scroll the view to the given x,y, update's the scrollbar's thumb
* positions and the view's offset. Clamps the values to be
* legal. Updates the display based on aUpdateFlags.
* @param aX left edge to scroll to
* @param aY top edge to scroll to
* @param aUpdateFlags passed onto nsIViewManager->UpdateView()
* @return error status
*/
NS_IMETHOD ScrollTo(nsIPresContext* aContext, nscoord aX, nscoord aY, PRUint32 aFlags = NS_VMREFRESH_NO_SYNC)=0;
NS_IMETHOD GetScrollableView(nsIPresContext* aContext, nsIScrollableView** aResult)=0;
/**
* Set information about whether the vertical and horizontal scrollbars
* are currently visible
*/
NS_IMETHOD SetScrollbarVisibility(nsIPresContext* aPresContext,
PRBool aVerticalVisible,
PRBool aHorizontalVisible) = 0;
NS_IMETHOD GetScrollbarBox(PRBool aVertical, nsIBox** aResult) = 0;
};
#endif