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144 lines
5.1 KiB
C++
144 lines
5.1 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: NPL 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 Netscape Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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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 the GNU General Public License Version 2 or later (the "GPL"), or
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* 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 NPL, 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 NPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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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class nsIFrame;
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class nsIBox;
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class nsIPresContext;
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class nsBoxLayoutState;
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// IID for the nsIScrollableFrame interface
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#define NS_ISCROLLABLE_FRAME_IID \
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{ 0xc95f1831, 0xc372, 0x11d1, \
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{ 0xb7, 0x21, 0x0, 0x64, 0x9, 0x92, 0xd8, 0xc9 } }
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class nsIScrollableFrame : public nsIScrollableViewProvider {
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public:
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enum nsScrollPref {
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Auto = 0,
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NeverScroll,
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AlwaysScroll,
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AlwaysScrollVertical,
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AlwaysScrollHorizontal
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(NS_ISCROLLABLE_FRAME_IID)
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/**
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* Set the frame that we are scrolling within the scrolling frame.
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*/
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NS_IMETHOD SetScrolledFrame(nsIPresContext* aPresContext,
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nsIFrame *aScrolledFrame) = 0;
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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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NS_IMETHOD GetScrolledFrame(nsIPresContext* aPresContext,
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nsIFrame *&aScrolledFrame) 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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*/
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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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/**
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* Get information about whether the vertical and horizontal scrollbars
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* are currently visible
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*/
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NS_IMETHOD GetScrollbarVisibility(nsIPresContext* aPresContext,
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PRBool *aVerticalVisible,
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PRBool *aHorizontalVisible) const = 0;
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/**
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* Query whether scroll bars should be displayed all the time, never or
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* only when necessary.
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* @return current scrollbar selection
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*/
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NS_IMETHOD GetScrollPreference(nsIPresContext* aPresContext, nsScrollPref* aScrollPreference) const = 0;
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/**
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* Get the position of the scrolled view.
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*/
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NS_IMETHOD GetScrollPosition(nsIPresContext* aContext, nscoord &aX, nscoord& aY) 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 passed onto nsIViewManager->UpdateView()
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* @return error status
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*/
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NS_IMETHOD ScrollTo(nsIPresContext* aContext, nscoord aX, nscoord aY, PRUint32 aFlags = NS_VMREFRESH_NO_SYNC)=0;
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NS_IMETHOD GetScrollableView(nsIPresContext* aContext, nsIScrollableView** aResult)=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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NS_IMETHOD SetScrollbarVisibility(nsIPresContext* aPresContext,
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PRBool aVerticalVisible,
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PRBool aHorizontalVisible) = 0;
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NS_IMETHOD GetScrollbarBox(PRBool aVertical, nsIBox** aResult) = 0;
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NS_IMETHOD CurPosAttributeChanged(nsIPresContext* aPresContext,
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nsIContent* aChild,
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PRInt32 aModType) = 0;
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};
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#endif
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