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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 nsIScrollFrame_h___
#define nsIScrollFrame_h___
#include "nsISupports.h"
#include "nsCoord.h"
#include "nsIViewManager.h"
#include "nsIScrollableViewProvider.h"
#include "nsPresContext.h"
#include "nsIFrame.h" // to get nsIBox, which is a typedef
class nsBoxLayoutState;
// IID for the nsIScrollableFrame interface
#define NS_ISCROLLABLE_FRAME_IID \
{ 0xf285c180, 0x8492, 0x48d5, \
{ 0xb1, 0xb5, 0x03, 0x28, 0x21, 0xc9, 0x72, 0x02 } }
class nsIScrollableFrame : public nsIScrollableViewProvider {
public:
NS_DEFINE_STATIC_IID_ACCESSOR(NS_ISCROLLABLE_FRAME_IID)
/**
* Get the frame that we are scrolling within the scrollable frame.
* @result child frame
*/
virtual nsIFrame* GetScrolledFrame() const = 0;
typedef nsPresContext::ScrollbarStyles ScrollbarStyles;
virtual ScrollbarStyles GetScrollbarStyles() const = 0;
/**
* Return the actual sizes of all possible scrollbars. Returns 0 for scrollbar
* positions that don't have a scrollbar or where the scrollbar is not visible.
* Do not call this while this frame's descendants are being reflowed, it won't be
* accurate.
*/
virtual nsMargin GetActualScrollbarSizes() const = 0;
/**
* Return the sizes of all scrollbars assuming that any scrollbars that could
* be visible due to overflowing content, are.
*/
virtual nsMargin GetDesiredScrollbarSizes(nsBoxLayoutState* aState) = 0;
/**
* Get the position of the scrolled view.
*/
virtual nsPoint GetScrollPosition() 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
*/
virtual void ScrollTo(nsPoint aScrollPosition, PRUint32 aFlags = NS_VMREFRESH_NO_SYNC)=0;
virtual nsIScrollableView* GetScrollableView() = 0;
/**
* Set information about whether the vertical and horizontal scrollbars
* are currently visible
*/
virtual void SetScrollbarVisibility(PRBool aVerticalVisible, PRBool aHorizontalVisible) = 0;
virtual nsIBox* GetScrollbarBox(PRBool aVertical) = 0;
virtual void CurPosAttributeChanged(nsIContent* aChild, PRInt32 aModType) = 0;
/**
* This tells the scroll frame to try scrolling to the scroll
* position that was restored from the history. This must be called
* at least once after state has been restored. It is called by the
* scrolled frame itself during reflow, but sometimes state can be
* restored after reflows are done...
*/
virtual void ScrollToRestoredPosition() = 0;
};
#endif
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