зеркало из https://github.com/mozilla/gecko-dev.git
556 строки
25 KiB
C++
556 строки
25 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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* Elika J. Etemad ("fantasai") <fantasai@inkedblade.net>
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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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/* base class #1 for rendering objects that have child lists */
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#ifndef nsContainerFrame_h___
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#define nsContainerFrame_h___
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#include "nsSplittableFrame.h"
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#include "nsFrameList.h"
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#include "nsLayoutUtils.h"
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/**
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* Child list name indices
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* @see #GetAdditionalChildListName()
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*/
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#define NS_CONTAINER_LIST_COUNT_SANS_OC 1
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// for frames that don't use overflow containers
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#define NS_CONTAINER_LIST_COUNT_INCL_OC 3
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// for frames that support overflow containers
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// Option flags for ReflowChild() and FinishReflowChild()
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// member functions
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#define NS_FRAME_NO_MOVE_VIEW 0x0001
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#define NS_FRAME_NO_MOVE_FRAME (0x0002 | NS_FRAME_NO_MOVE_VIEW)
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#define NS_FRAME_NO_SIZE_VIEW 0x0004
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#define NS_FRAME_NO_VISIBILITY 0x0008
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class nsOverflowContinuationTracker;
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/**
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* Implementation of a container frame.
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*/
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class nsContainerFrame : public nsSplittableFrame
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{
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public:
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// nsIFrame overrides
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NS_IMETHOD Init(nsIContent* aContent,
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nsIFrame* aParent,
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nsIFrame* aPrevInFlow);
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NS_IMETHOD SetInitialChildList(nsIAtom* aListName,
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nsIFrame* aChildList);
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NS_IMETHOD AppendFrames(nsIAtom* aListName,
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nsIFrame* aFrameList);
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NS_IMETHOD InsertFrames(nsIAtom* aListName,
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nsIFrame* aPrevFrame,
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nsIFrame* aFrameList);
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NS_IMETHOD RemoveFrame(nsIAtom* aListName,
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nsIFrame* aOldFrame);
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virtual nsIFrame* GetFirstChild(nsIAtom* aListName) const;
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virtual nsIAtom* GetAdditionalChildListName(PRInt32 aIndex) const;
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virtual void Destroy();
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virtual void ChildIsDirty(nsIFrame* aChild);
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virtual PRBool IsLeaf() const;
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virtual PRBool PeekOffsetNoAmount(PRBool aForward, PRInt32* aOffset);
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virtual PRBool PeekOffsetCharacter(PRBool aForward, PRInt32* aOffset);
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#ifdef DEBUG
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NS_IMETHOD List(FILE* out, PRInt32 aIndent) const;
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#endif
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// nsContainerFrame methods
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virtual void DeleteNextInFlowChild(nsPresContext* aPresContext,
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nsIFrame* aNextInFlow);
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static PRInt32 LengthOf(nsIFrame* aFrameList) {
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nsFrameList tmp(aFrameList);
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return tmp.GetLength();
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}
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// Positions the frame's view based on the frame's origin
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static void PositionFrameView(nsIFrame* aKidFrame);
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// Set the view's size and position after its frame has been reflowed.
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//
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// Flags:
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// NS_FRAME_NO_MOVE_VIEW - don't position the frame's view. Set this if you
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// don't want to automatically sync the frame and view
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// NS_FRAME_NO_SIZE_VIEW - don't size the view
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static void SyncFrameViewAfterReflow(nsPresContext* aPresContext,
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nsIFrame* aFrame,
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nsIView* aView,
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const nsRect* aCombinedArea,
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PRUint32 aFlags = 0);
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// Sets the view's attributes from the frame style.
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// - opacity
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// - visibility
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// - content transparency
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// - clip
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// Call this when one of these styles changes or when the view has just
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// been created.
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// @param aStyleContext can be null, in which case the frame's style context is used
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static void SyncFrameViewProperties(nsPresContext* aPresContext,
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nsIFrame* aFrame,
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nsStyleContext* aStyleContext,
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nsIView* aView,
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PRUint32 aFlags = 0);
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// Returns PR_TRUE if the frame requires a view
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static PRBool FrameNeedsView(nsIFrame* aFrame);
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// Used by both nsInlineFrame and nsFirstLetterFrame.
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void DoInlineIntrinsicWidth(nsIRenderingContext *aRenderingContext,
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InlineIntrinsicWidthData *aData,
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nsLayoutUtils::IntrinsicWidthType aType);
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/**
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* This is the CSS block concept of computing 'auto' widths, which most
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* classes derived from nsContainerFrame want.
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*/
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virtual nsSize ComputeAutoSize(nsIRenderingContext *aRenderingContext,
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nsSize aCBSize, nscoord aAvailableWidth,
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nsSize aMargin, nsSize aBorder,
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nsSize aPadding, PRBool aShrinkWrap);
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/**
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* Invokes the WillReflow() function, positions the frame and its view (if
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* requested), and then calls Reflow(). If the reflow succeeds and the child
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* frame is complete, deletes any next-in-flows using DeleteNextInFlowChild()
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*
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* Flags:
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* NS_FRAME_NO_MOVE_VIEW - don't position the frame's view. Set this if you
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* don't want to automatically sync the frame and view
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* NS_FRAME_NO_MOVE_FRAME - don't move the frame. aX and aY are ignored in this
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* case. Also implies NS_FRAME_NO_MOVE_VIEW
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*/
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nsresult ReflowChild(nsIFrame* aKidFrame,
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nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nscoord aX,
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nscoord aY,
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PRUint32 aFlags,
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nsReflowStatus& aStatus,
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nsOverflowContinuationTracker* aTracker = nsnull);
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/**
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* The second half of frame reflow. Does the following:
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* - sets the frame's bounds
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* - sizes and positions (if requested) the frame's view. If the frame's final
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* position differs from the current position and the frame itself does not
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* have a view, then any child frames with views are positioned so they stay
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* in sync
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* - sets the view's visibility, opacity, content transparency, and clip
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* - invoked the DidReflow() function
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*
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* Flags:
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* NS_FRAME_NO_MOVE_FRAME - don't move the frame. aX and aY are ignored in this
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* case. Also implies NS_FRAME_NO_MOVE_VIEW
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* NS_FRAME_NO_MOVE_VIEW - don't position the frame's view. Set this if you
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* don't want to automatically sync the frame and view
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* NS_FRAME_NO_SIZE_VIEW - don't size the frame's view
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*/
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static nsresult FinishReflowChild(nsIFrame* aKidFrame,
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nsPresContext* aPresContext,
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const nsHTMLReflowState* aReflowState,
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const nsHTMLReflowMetrics& aDesiredSize,
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nscoord aX,
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nscoord aY,
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PRUint32 aFlags);
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static void PositionChildViews(nsIFrame* aFrame);
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// ==========================================================================
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/* Overflow containers are continuation frames that hold overflow. They
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* are created when the frame runs out of computed height, but still has
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* too much content to fit in the availableHeight. The parent creates a
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* continuation as usual, but marks it as NS_FRAME_IS_OVERFLOW_CONTAINER
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* and adds it to its next-in-flow's overflow container list, either by
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* adding it directly or by putting it in its own excess overflow containers
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* list (to be drained by the next-in-flow when it calls
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* ReflowOverflowContainerChildren). The parent continues reflow as if
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* the frame was complete once it ran out of computed height, but returns
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* either an NS_FRAME_NOT_COMPLETE or NS_FRAME_OVERFLOW_INCOMPLETE reflow
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* status to request a next-in-flow. The parent's next-in-flow is then
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* responsible for calling ReflowOverflowContainerChildren to (drain and)
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* reflow these overflow continuations. Overflow containers do not affect
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* other frames' size or position during reflow (but do affect their
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* parent's overflow area).
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*
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* Overflow container continuations are different from normal continuations
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* in that
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* - more than one child of the frame can have its next-in-flow broken
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* off and pushed into the frame's next-in-flow
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* - new continuations may need to be spliced into the middle of the list
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* or deleted continuations slipped out
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* e.g. A, B, C are all fixed-size containers on one page, all have
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* overflow beyond availableHeight, and content is dynamically added
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* and removed from B
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* As a result, it is not possible to simply prepend the new continuations
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* to the old list as with the overflowProperty mechanism. To avoid
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* complicated list splicing, the code assumes only one overflow containers
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* list exists for a given frame: either its own overflowContainersProperty
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* or its prev-in-flow's excessOverflowContainersProperty, not both.
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*
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* The nsOverflowContinuationTracker helper class should be used for tracking
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* overflow containers and adding them to the appropriate list.
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* See nsBlockFrame::Reflow for a sample implementation.
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*/
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friend class nsOverflowContinuationTracker;
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/**
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* Reflow overflow container children. They are invisible to normal reflow
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* (i.e. don't affect sizing or placement of other children) and inherit
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* width and horizontal position from their prev-in-flow.
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*
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* This method
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* 1. Pulls excess overflow containers from the prev-in-flow and adds
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* them to our overflow container list
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* 2. Reflows all our overflow container kids
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* 3. Expands aOverflowRect as necessary to accomodate these children.
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* 4. Sets aStatus's NS_FRAME_OVERFLOW_IS_INCOMPLETE flag (along with
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* NS_FRAME_REFLOW_NEXTINFLOW as necessary) if any overflow children
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* are incomplete and
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* 5. Prepends a list of their continuations to our excess overflow
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* container list, to be drained into our next-in-flow when it is
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* reflowed.
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*
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* The caller is responsible for tracking any new overflow container
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* continuations it makes, removing them from its child list, and
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* making sure they are stored properly in the overflow container lists.
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* The nsOverflowContinuationTracker helper class should be used for this.
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*
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* (aFlags just gets passed through to ReflowChild)
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*/
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nsresult ReflowOverflowContainerChildren(nsPresContext* aPresContext,
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const nsHTMLReflowState& aReflowState,
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nsRect& aOverflowRect,
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PRUint32 aFlags,
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nsReflowStatus& aStatus);
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/**
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* Removes aChild without destroying it and without requesting reflow.
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* Continuations are not affected. Checks the primary and overflow
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* or overflow containers and excess overflow containers lists, depending
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* on whether the NS_FRAME_IS_OVERFLOW_CONTAINER flag is set. Does not
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* check any other auxiliary lists.
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* Returns NS_ERROR_UNEXPECTED if we failed to remove aChild.
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* Returns other error codes if we failed to put back a proptable list.
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* If aForceNormal is true, only checks the primary and overflow lists
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* even when the NS_FRAME_IS_OVERFLOW_CONTAINER flag is set.
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*/
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virtual nsresult StealFrame(nsPresContext* aPresContext,
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nsIFrame* aChild,
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PRBool aForceNormal = PR_FALSE);
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/**
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* Add overflow containers to the display list
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*/
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void DisplayOverflowContainers(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists);
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/**
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* Builds display lists for the children. The background
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* of each child is placed in the Content() list (suitable for inline
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* children and other elements that behave like inlines,
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* but not for in-flow block children of blocks). DOES NOT
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* paint the background/borders/outline of this frame. This should
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* probably be avoided and eventually removed. It's currently here
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* to emulate what nsContainerFrame::Paint did.
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*/
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NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists);
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protected:
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nsContainerFrame(nsStyleContext* aContext) : nsSplittableFrame(aContext) {}
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~nsContainerFrame();
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/**
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* Builds a display list for non-block children that behave like
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* inlines. This puts the background of each child into the
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* Content() list (suitable for inline children but not for
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* in-flow block children of blocks).
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* @param aForcePseudoStack forces each child into a pseudo-stacking-context
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* so its background and all other display items (except for positioned
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* display items) go into the Content() list.
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*/
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nsresult BuildDisplayListForNonBlockChildren(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists,
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PRUint32 aFlags = 0);
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// ==========================================================================
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/* Overflow Frames are frames that did not fit and must be pulled by
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* our next-in-flow during its reflow. (The same concept for overflow
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* containers is called "excess frames". We should probably make the
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* names match.)
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*/
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/**
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* Get the frames on the overflow list
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*/
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nsIFrame* GetOverflowFrames(nsPresContext* aPresContext,
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PRBool aRemoveProperty) const;
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/**
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* Set the overflow list
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*/
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nsresult SetOverflowFrames(nsPresContext* aPresContext,
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nsIFrame* aOverflowFrames);
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/**
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* Moves any frames on both the prev-in-flow's overflow list and the
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* receiver's overflow to the receiver's child list.
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*
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* Resets the overlist pointers to nsnull, and updates the receiver's child
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* count and content mapping.
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*
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* @return PR_TRUE if any frames were moved and PR_FALSE otherwise
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*/
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PRBool MoveOverflowToChildList(nsPresContext* aPresContext);
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/**
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* Push aFromChild and its next siblings to the next-in-flow. Change
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* the geometric parent of each frame that's pushed. If there is no
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* next-in-flow the frames are placed on the overflow list (and the
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* geometric parent is left unchanged).
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*
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* Updates the next-in-flow's child count. Does <b>not</b> update the
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* pusher's child count.
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*
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* @param aFromChild the first child frame to push. It is disconnected from
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* aPrevSibling
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* @param aPrevSibling aFromChild's previous sibling. Must not be null.
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* It's an error to push a parent's first child frame
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*/
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void PushChildren(nsPresContext* aPresContext,
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nsIFrame* aFromChild,
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nsIFrame* aPrevSibling);
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// ==========================================================================
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/*
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* Convenience methods for nsFrameLists stored in the
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* PresContext's proptable
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*/
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/**
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* Get the PresContext-stored nsFrameList named aPropID for this frame.
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* May return null.
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*/
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nsFrameList* GetPropTableFrames(nsPresContext* aPresContext,
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nsIAtom* aPropID) const;
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/**
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* Remove and return the PresContext-stored nsFrameList named aPropID for
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* this frame. May return null.
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*/
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nsFrameList* RemovePropTableFrames(nsPresContext* aPresContext,
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nsIAtom* aPropID) const;
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/**
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* Remove aFrame from the PresContext-stored nsFrameList named aPropID
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* for this frame, deleting the list if it is now empty.
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* Return true if the aFrame was successfully removed,
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* Return false otherwise.
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*/
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PRBool RemovePropTableFrame(nsPresContext* aPresContext,
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nsIFrame* aFrame,
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nsIAtom* aPropID) const;
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/**
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* Set the PresContext-stored nsFrameList named aPropID for this frame
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* to the given aFrameList, which must not be null.
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*/
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nsresult SetPropTableFrames(nsPresContext* aPresContext,
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nsFrameList* aFrameList,
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nsIAtom* aPropID) const;
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// ==========================================================================
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nsFrameList mFrames;
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};
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// ==========================================================================
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/* The out-of-flow-related code below is for a hacky way of splitting
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* absolutely-positioned frames. Basically what we do is split the frame
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* in nsAbsoluteContainingBlock and pretend the continuation is an overflow
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* container. This isn't an ideal solution, but it lets us print the content
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* at least. See bug 154892.
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*/
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#define IS_TRUE_OVERFLOW_CONTAINER(frame) \
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( (frame->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER) \
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&& !(frame->GetStateBits() & NS_FRAME_OUT_OF_FLOW) )
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//XXXfr This check isn't quite correct, because it doesn't handle cases
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// where the out-of-flow has overflow.. but that's rare.
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// We'll need to revisit the way abspos continuations are handled later
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// for various reasons, this detail is one of them. See bug 154892
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/**
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* Helper class for tracking overflow container continuations during reflow.
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*
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* A frame is related to two sets of overflow containers: those that /are/
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* its own children, and those that are /continuations/ of its children.
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* This tracker walks through those continuations (the frame's NIF's children)
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* and their prev-in-flows (a subset of the frame's normal and overflow
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* container children) in parallel. It allows the reflower to synchronously
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* walk its overflow continuations while it loops through and reflows its
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* children. This makes it possible to insert new continuations at the correct
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* place in the overflow containers list.
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*
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* The reflower is expected to loop through its children in the same order it
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* looped through them the last time (if there was a last time).
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* For each child, the reflower should either
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* - call Skip for the child if was not reflowed in this pass
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* - call Insert for the overflow continuation if the child was reflowed
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* but has incomplete overflow
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* - call Finished for the child if it was reflowed in this pass but
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* is either complete or has a normal next-in-flow. This call can
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* be skipped if the child did not previously have an overflow
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* continuation.
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*/
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class nsOverflowContinuationTracker {
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public:
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/**
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* Initializes an nsOverflowContinuationTracker to help track overflow
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* continuations of aFrame's children. Typically invoked on 'this'.
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*
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* aWalkOOFFrames determines whether the walker skips out-of-flow frames
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* or skips non-out-of-flow frames.
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*
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* Don't set aSkipOverflowContainerChildren to PR_FALSE unless you plan
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* to walk your own overflow container children. (Usually they are handled
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* by calling ReflowOverflowContainerChildren.) aWalkOOFFrames is ignored
|
|
* if aSkipOverflowContainerChildren is false.
|
|
*/
|
|
nsOverflowContinuationTracker(nsPresContext* aPresContext,
|
|
nsContainerFrame* aFrame,
|
|
PRBool aWalkOOFFrames,
|
|
PRBool aSkipOverflowContainerChildren = PR_TRUE);
|
|
/**
|
|
* This function adds an overflow continuation to our running list and
|
|
* sets its NS_FRAME_IS_OVERFLOW_CONTAINER flag.
|
|
*
|
|
* aReflowStatus should preferably be specific to the recently-reflowed
|
|
* child and not influenced by any of its siblings' statuses. This
|
|
* function sets the NS_FRAME_IS_DIRTY bit on aOverflowCont if it needs
|
|
* to be reflowed. (Its need for reflow depends on changes to its
|
|
* prev-in-flow, not to its parent--for whom it is invisible, reflow-wise.)
|
|
*
|
|
* The caller MUST disconnect the frame from its parent's child list
|
|
* if it was not previously an NS_FRAME_IS_OVERFLOW_CONTAINER (because
|
|
* StealFrame is much more inefficient than disconnecting in place
|
|
* during Reflow, which the caller is able to do but we are not).
|
|
*
|
|
* The caller MUST NOT disconnect the frame from its parent's
|
|
* child list if it is already an NS_FRAME_IS_OVERFLOW_CONTAINER.
|
|
* (In this case we will disconnect and reconnect it ourselves.)
|
|
*/
|
|
nsresult Insert(nsIFrame* aOverflowCont,
|
|
nsReflowStatus& aReflowStatus);
|
|
/**
|
|
* This function must be called for each child that is reflowed
|
|
* but no longer has an overflow continuation. (It may be called for
|
|
* other children, but in that case has no effect.) It increments our
|
|
* walker and makes sure we drop any dangling pointers to its
|
|
* next-in-flow. This function MUST be called before stealing or
|
|
* deleting aChild's next-in-flow.
|
|
*/
|
|
void Finish(nsIFrame* aChild);
|
|
|
|
/**
|
|
* This function should be called for each child that isn't reflowed.
|
|
* It increments our walker and sets the NS_FRAME_OVERFLOW_INCOMPLETE
|
|
* reflow flag if it encounters an overflow continuation so that our
|
|
* next-in-flow doesn't get prematurely deleted. It MUST be called on
|
|
* each unreflowed child that has an overflow container continuation;
|
|
* it MAY be called on other children, but it isn't necessary (doesn't
|
|
* do anything).
|
|
*/
|
|
void Skip(nsIFrame* aChild, nsReflowStatus& aReflowStatus)
|
|
{
|
|
NS_PRECONDITION(aChild, "null ptr");
|
|
if (aChild == mSentry) {
|
|
StepForward();
|
|
aReflowStatus = NS_FRAME_MERGE_INCOMPLETE(aReflowStatus,
|
|
NS_FRAME_OVERFLOW_INCOMPLETE);
|
|
}
|
|
}
|
|
|
|
private:
|
|
|
|
void SetUpListWalker();
|
|
void StepForward();
|
|
|
|
/* We hold a pointer to either the next-in-flow's overflow containers list
|
|
or, if that doesn't exist, our frame's excess overflow containers list.
|
|
We need to make sure that we drop that pointer if the list becomes
|
|
empty and is deleted elsewhere. */
|
|
nsFrameList* mOverflowContList;
|
|
/* We hold a pointer to the most recently-reflowed child that has an
|
|
overflow container next-in-flow. We do this because it's a known
|
|
good point; this pointer won't be deleted on us. We can use it to
|
|
recover our place in the list. */
|
|
nsIFrame* mPrevOverflowCont;
|
|
/* This is a pointer to the next overflow container's prev-in-flow, which
|
|
is (or should be) a child of our frame. When we hit this, we will need
|
|
to increment this walker to the next overflow container. */
|
|
nsIFrame* mSentry;
|
|
/* Parent of all frames in mOverflowContList. If our mOverflowContList
|
|
is an excessOverflowContainersProperty, then this our frame (the frame
|
|
that was passed in to our constructor). Otherwise this is that frame's
|
|
next-in-flow, and our mOverflowContList is mParent's
|
|
overflowContainersProperty */
|
|
nsContainerFrame* mParent;
|
|
/* Tells SetUpListWalker whether or not to walk us past any continuations
|
|
of overflow containers. aWalkOOFFrames is ignored when this is false. */
|
|
PRBool mSkipOverflowContainerChildren;
|
|
/* Tells us whether to pay attention to OOF frames or non-OOF frames */
|
|
PRBool mWalkOOFFrames;
|
|
};
|
|
|
|
#endif /* nsContainerFrame_h___ */
|