зеркало из https://github.com/mozilla/pjs.git
285 строки
11 KiB
C++
285 строки
11 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 Communicator client 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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#ifndef nsGfxScrollFrame_h___
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#define nsGfxScrollFrame_h___
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#include "nsHTMLContainerFrame.h"
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#include "nsIAnonymousContentCreator.h"
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#include "nsBoxFrame.h"
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#include "nsIScrollableFrame.h"
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#include "nsIScrollPositionListener.h"
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class nsISupportsArray;
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class nsIScrollableView;
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class nsIPresContext;
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class nsIPresShell;
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class nsIContent;
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class nsGfxScrollFrame;
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class nsIAtom;
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class nsIDocument;
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class nsGfxScrollFrameInner : public nsIScrollPositionListener {
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public:
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NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr);
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NS_IMETHOD_(nsrefcnt) AddRef(void);
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NS_IMETHOD_(nsrefcnt) Release(void);
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nsGfxScrollFrameInner(nsGfxScrollFrame* aOuter);
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struct ScrollbarStyles {
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// one of NS_STYLE_OVERFLOW_SCROLL, NS_STYLE_OVERFLOW_HIDDEN,
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// NS_STYLE_OVERFLOW_VISIBLE, NS_STYLE_OVERFLOW_AUTO
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PRInt32 mHorizontal;
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PRInt32 mVertical;
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ScrollbarStyles(PRInt32 h, PRInt32 v) : mHorizontal(h), mVertical(v) {}
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};
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ScrollbarStyles GetScrollbarStylesFromFrame() const;
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nsIScrollableFrame::nsScrollPref GetScrollPreference() const;
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// If a child frame was added or removed on the scrollframe,
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// reload our child frame list.
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// We need this if a scrollbar frame is recreated.
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void ReloadChildFrames();
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void CreateAnonymousContent(nsISupportsArray& aAnonymousChildren);
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// nsIScrollPositionListener
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NS_IMETHOD ScrollPositionWillChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY);
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NS_IMETHOD ScrollPositionDidChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY);
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// This gets called when the 'curpos' attribute on one of the scrollbars changes
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nsresult CurPosAttributeChanged(nsIPresContext* aPresContext,
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nsIContent* aChild,
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PRInt32 aModType);
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PRBool SetAttribute(nsIBox* aBox, nsIAtom* aAtom, nscoord aSize, PRBool aReflow=PR_TRUE);
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PRInt32 GetIntegerAttribute(nsIBox* aFrame, nsIAtom* atom, PRInt32 defaultValue);
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nsresult Layout(nsBoxLayoutState& aState);
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nsresult LayoutBox(nsBoxLayoutState& aState, nsIBox* aBox, const nsRect& aRect);
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// Like ScrollPositionDidChange, but initiated by this frame rather than from the
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// scrolling view
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void InternalScrollPositionDidChange(nscoord aX, nscoord aY);
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PRBool AddRemoveScrollbar (PRBool& aHasScrollbar,
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nscoord& aXY,
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nscoord& aSize,
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nscoord aSbSize,
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PRBool aOnRightOrBottom,
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PRBool aAdd);
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PRBool AddRemoveScrollbar(nsBoxLayoutState& aState,
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nsRect& aScrollAreaSize,
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PRBool aOnTop,
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PRBool aHorizontal,
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PRBool aAdd);
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PRBool AddHorizontalScrollbar (nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnBottom);
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PRBool AddVerticalScrollbar (nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnRight);
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void RemoveHorizontalScrollbar(nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnBottom);
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void RemoveVerticalScrollbar (nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnRight);
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nsIScrollableView* GetScrollableView() const;
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void ScrollbarChanged(nsIPresContext* aPresContext, nscoord aX, nscoord aY, PRUint32 aFlags);
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void SetScrollbarVisibility(nsIBox* aScrollbar, PRBool aVisible);
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NS_IMETHOD GetScrolledSize(nsIPresContext* aPresContext,
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nscoord *aWidth,
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nscoord *aHeight) const;
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void AdjustReflowStateForPrintPreview(nsBoxLayoutState& aState, PRBool& aSetBack);
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void AdjustReflowStateBack(nsBoxLayoutState& aState, PRBool aSetBack);
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nsIBox* mHScrollbarBox;
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nsIBox* mVScrollbarBox;
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nsIBox* mScrollAreaBox;
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nsIBox* mScrollCornerBox;
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nscoord mOnePixel;
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nsGfxScrollFrame* mOuter;
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nscoord mMaxElementWidth;
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// The last dir value we saw in AddHorizontalScrollbar. Use PRInt16
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// so we can fit all the possible values of a PRUint8 and have a -1
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// value that indicates "not set")
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PRInt16 mLastDir;
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PRPackedBool mNeverHasVerticalScrollbar;
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PRPackedBool mNeverHasHorizontalScrollbar;
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PRPackedBool mHasVerticalScrollbar;
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PRPackedBool mHasHorizontalScrollbar;
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PRPackedBool mFirstPass;
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PRPackedBool mIsRoot;
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PRPackedBool mNeverReflowed;
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PRPackedBool mViewInitiatedScroll;
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PRPackedBool mFrameInitiatedScroll;
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};
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/**
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* The scroll frame creates and manages the scrolling view
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*
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* It only supports having a single child frame that typically is an area
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* frame, but doesn't have to be. The child frame must have a view, though
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*
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* Scroll frames don't support incremental changes, i.e. you can't replace
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* or remove the scrolled frame
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*/
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class nsGfxScrollFrame : public nsBoxFrame,
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public nsIScrollableFrame,
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public nsIAnonymousContentCreator {
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public:
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friend nsresult NS_NewGfxScrollFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame,
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PRBool aIsRoot);
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// Called to set the child frames. We typically have three: the scroll area,
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// the vertical scrollbar, and the horizontal scrollbar.
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NS_IMETHOD SetInitialChildList(nsIPresContext* aPresContext,
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nsIAtom* aListName,
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nsIFrame* aChildList);
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NS_IMETHOD Reflow(nsIPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus);
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// Because there can be only one child frame, these two function return
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// NS_ERROR_FAILURE
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NS_IMETHOD AppendFrames(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aFrameList);
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NS_IMETHOD InsertFrames(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aPrevFrame,
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nsIFrame* aFrameList);
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NS_IMETHOD ReplaceFrame(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aOldFrame,
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nsIFrame* aNewFrame);
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NS_IMETHOD Destroy(nsIPresContext* aPresContext);
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NS_IMETHOD RemoveFrame(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aOldFrame);
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NS_IMETHOD GetContentAndOffsetsFromPoint(nsIPresContext* aCX,
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const nsPoint& aPoint,
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nsIContent ** aNewContent,
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PRInt32& aContentOffset,
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PRInt32& aContentOffsetEnd,
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PRBool& aBeginFrameContent);
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// nsIAnonymousContentCreator
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NS_IMETHOD CreateAnonymousContent(nsIPresContext* aPresContext,
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nsISupportsArray& aAnonymousItems);
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NS_IMETHOD CreateFrameFor(nsIPresContext* aPresContext,
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nsIContent * aContent,
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nsIFrame** aFrame) { if (aFrame) *aFrame = nsnull; return NS_ERROR_FAILURE; }
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// nsIBox methods
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NS_DECL_ISUPPORTS
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NS_IMETHOD GetPrefSize(nsBoxLayoutState& aBoxLayoutState, nsSize& aSize);
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NS_IMETHOD GetMinSize(nsBoxLayoutState& aBoxLayoutState, nsSize& aSize);
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NS_IMETHOD GetMaxSize(nsBoxLayoutState& aBoxLayoutState, nsSize& aSize);
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NS_IMETHOD GetAscent(nsBoxLayoutState& aBoxLayoutState, nscoord& aAscent);
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NS_IMETHOD DoLayout(nsBoxLayoutState& aBoxLayoutState);
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NS_IMETHOD GetPadding(nsMargin& aPadding);
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// nsIScrollableFrame
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NS_IMETHOD GetScrolledFrame(nsIPresContext* aPresContext, nsIFrame *&aScrolledFrame) const;
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NS_IMETHOD GetScrollableView(nsIPresContext* aContext, nsIScrollableView** aResult);
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NS_IMETHOD GetScrollPosition(nsIPresContext* aContext, nscoord &aX, nscoord& aY) const;
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NS_IMETHOD ScrollTo(nsIPresContext* aContext, nscoord aX, nscoord aY, PRUint32 aFlags);
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NS_IMETHOD SetScrollbarVisibility(nsIPresContext* aPresContext,
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PRBool aVerticalVisible,
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PRBool aHorizontalVisible);
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NS_IMETHOD GetScrollbarBox(PRBool aVertical, nsIBox** aResult);
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NS_IMETHOD CurPosAttributeChanged(nsIPresContext* aPresContext,
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nsIContent* aChild,
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PRInt32 aModType);
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NS_IMETHOD GetScrollPreference(nsIPresContext* aPresContext, nsScrollPref* aScrollPreference) const;
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virtual nsMargin GetActualScrollbarSizes() const;
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virtual nsMargin GetDesiredScrollbarSizes(nsBoxLayoutState* aState);
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/**
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* Get the "type" of the frame
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*
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* @see nsLayoutAtoms::scrollFrame
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*/
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virtual nsIAtom* GetType() const;
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#ifdef NS_DEBUG
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NS_IMETHOD GetFrameName(nsAString& aResult) const;
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#endif
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virtual nsresult GetContentOf(nsIContent** aContent);
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static nsGfxScrollFrame* GetScrollFrameForPort(nsIFrame* aPort);
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virtual nsGfxScrollFrameInner::ScrollbarStyles GetScrollbarStyles() const;
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protected:
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nsGfxScrollFrame(nsIPresShell* aShell, PRBool aIsRoot);
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virtual PRIntn GetSkipSides() const;
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private:
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friend class nsGfxScrollFrameInner;
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nsGfxScrollFrameInner mInner;
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};
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#endif /* nsGfxScrollFrame_h___ */
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