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125 lines
4.5 KiB
C++
125 lines
4.5 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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/*
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* interface for rendering objects that wrap rendering objects that should
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* be scrollable
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*/
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#ifndef nsIScrollFrame_h___
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#define nsIScrollFrame_h___
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#include "nsISupports.h"
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#include "nsCoord.h"
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#include "nsIViewManager.h"
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#include "nsIScrollableViewProvider.h"
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#include "nsPresContext.h"
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#include "nsIFrame.h" // to get nsIBox, which is a typedef
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class nsBoxLayoutState;
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class nsIScrollableFrame : public nsIScrollableViewProvider {
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public:
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NS_DECL_QUERYFRAME_TARGET(nsIScrollableFrame)
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/**
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* Get the frame that we are scrolling within the scrollable frame.
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* @result child frame
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*/
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virtual nsIFrame* GetScrolledFrame() const = 0;
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typedef nsPresContext::ScrollbarStyles ScrollbarStyles;
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virtual ScrollbarStyles GetScrollbarStyles() const = 0;
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/**
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* Return the actual sizes of all possible scrollbars. Returns 0 for scrollbar
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* positions that don't have a scrollbar or where the scrollbar is not visible.
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* Do not call this while this frame's descendants are being reflowed, it won't be
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* accurate.
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*/
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virtual nsMargin GetActualScrollbarSizes() const = 0;
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/**
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* Return the sizes of all scrollbars assuming that any scrollbars that could
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* be visible due to overflowing content, are.
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*/
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virtual nsMargin GetDesiredScrollbarSizes(nsBoxLayoutState* aState) = 0;
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virtual nsMargin GetDesiredScrollbarSizes(nsPresContext* aPresContext,
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nsIRenderingContext* aRC) = 0;
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/**
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* Get the position of the scrolled view.
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*/
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virtual nsPoint GetScrollPosition() const = 0;
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/**
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* Scroll the view to the given x,y, update's the scrollbar's thumb
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* positions and the view's offset. Clamps the values to be
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* legal. Updates the display based on aUpdateFlags.
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* @param aX left edge to scroll to
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* @param aY top edge to scroll to
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* @param aUpdateFlags indicate smooth or async scrolling
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* @return error status
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*/
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virtual void ScrollTo(nsPoint aScrollPosition, PRUint32 aFlags = 0)=0;
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virtual nsIScrollableView* GetScrollableView() = 0;
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/**
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* Set information about whether the vertical and horizontal scrollbars
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* are currently visible
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*/
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virtual void SetScrollbarVisibility(PRBool aVerticalVisible, PRBool aHorizontalVisible) = 0;
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virtual nsIBox* GetScrollbarBox(PRBool aVertical) = 0;
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virtual void CurPosAttributeChanged(nsIContent* aChild, PRInt32 aModType) = 0;
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/**
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* This tells the scroll frame to try scrolling to the scroll
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* position that was restored from the history. This must be called
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* at least once after state has been restored. It is called by the
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* scrolled frame itself during reflow, but sometimes state can be
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* restored after reflows are done...
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*/
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virtual void ScrollToRestoredPosition() = 0;
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};
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#endif
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