зеркало из https://github.com/mozilla/pjs.git
179 строки
6.3 KiB
C++
179 строки
6.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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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 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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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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/**
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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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NS_IMETHOD SizeOf(nsISizeOfHandler* aHandler) const;
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NS_IMETHOD Init(nsIPresContext& aPresContext, nsIFrame* aChildList);
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NS_IMETHOD DeleteFrame(nsIPresContext& aPresContext);
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NS_IMETHOD DidReflow(nsIPresContext& aPresContext,
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nsDidReflowStatus aStatus);
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// Painting
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NS_IMETHOD Paint(nsIPresContext& aPresContext,
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nsIRenderingContext& aRenderingContext,
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const nsRect& aDirtyRect);
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/**
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* Pass through the event to the correct child frame.
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* Return PR_TRUE if the event is consumed.
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*/
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NS_IMETHOD HandleEvent(nsIPresContext& aPresContext,
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nsGUIEvent* aEvent,
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nsEventStatus& aEventStatus);
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NS_IMETHOD GetCursorAndContentAt(nsIPresContext& aPresContext,
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const nsPoint& aPoint,
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nsIFrame** aFrame,
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nsIContent** aContent,
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PRInt32& aCursor);
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// Child frame enumeration.
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// ChildAt() retruns null if the index is not in the range 0 .. ChildCount() - 1.
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// IndexOf() returns -1 if the frame is not in the child list.
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NS_IMETHOD FirstChild(nsIFrame*& aFirstChild) const;
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// Debugging
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NS_IMETHOD List(FILE* out = stdout, PRInt32 aIndent = 0, nsIListFilter *aFilter = nsnull) const;
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NS_IMETHOD VerifyTree() const;
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/**
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* Return the number of children in the sibling list, starting at aChild.
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* Returns zero if aChild is nsnull.
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*/
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static PRInt32 LengthOf(nsIFrame* aChild);
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/**
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* Return the last frame in the sibling list.
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* Returns nsnullif aChild is nsnull.
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*/
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static nsIFrame* LastFrame(nsIFrame* aChild);
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/**
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* Returns the frame at the specified index relative to aFrame
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*/
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static nsIFrame* FrameAt(nsIFrame* aFrame, PRInt32 aIndex);
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// XXX needs to be virtual so that nsBlockFrame can override it
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virtual PRBool DeleteChildsNextInFlow(nsIPresContext& aPresContext,
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nsIFrame* aChild);
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protected:
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// Constructor. Takes as arguments the content object, the index in parent,
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// and the Frame for the content parent
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nsContainerFrame(nsIContent* aContent, nsIFrame* aParent);
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virtual ~nsContainerFrame();
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void SizeOfWithoutThis(nsISizeOfHandler* aHandler) const;
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/**
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* Prepare a continuation frame of this frame for reflow. Appends
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* it to the flow, sets its content offsets, mLastContentIsComplete,
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* and style context. Subclasses should invoke this method after
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* construction of a continuing frame.
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*/
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void PrepareContinuingFrame(nsIPresContext& aPresContext,
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nsIFrame* aParent,
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nsIStyleContext* aStyleContext,
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nsContainerFrame* aContFrame);
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virtual void PaintChildren(nsIPresContext& aPresContext,
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nsIRenderingContext& aRenderingContext,
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const nsRect& aDirtyRect);
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/**
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* Queries the child frame for the nsIHTMLReflow interface and if it's
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* supported invokes the WillReflow() and Reflow() member functions. If
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* the reflow succeeds and the child frame is complete, deletes any
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* next-in-flows using DeleteChildsNextInFlow()
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*/
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nsresult ReflowChild(nsIFrame* aKidFrame,
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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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/**
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* Moves any frames on both the prev-in-flow's overflow list and the receiver's
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* 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();
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/**
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* Push aFromChild and its next siblings to the next-in-flow. Change the
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* geometric parent of each frame that's pushed. If there is no next-in-flow
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* the frames are placed on the overflow list (and the geometric parent is
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* 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. It's
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* an error to push a parent's first child frame
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*/
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void PushChildren(nsIFrame* aFromChild, nsIFrame* aPrevSibling);
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/**
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* Append child list starting at aChild to this frame's child list. Used for
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* processing of the overflow list.
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*
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* Updates this frame's child count and content mapping.
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*
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* @param aChild the beginning of the child list
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* @param aSetParent if true each child's geometric (and content parent if
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* they're the same) parent is set to this frame.
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*/
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void AppendChildren(nsIFrame* aChild, PRBool aSetParent = PR_TRUE);
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virtual void WillDeleteNextInFlowFrame(nsIFrame* aNextInFlow);
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#ifdef NS_DEBUG
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/**
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* Returns PR_TRUE if aChild is a child of this frame.
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*/
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PRBool IsChild(const nsIFrame* aChild) const;
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void DumpTree() const;
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#endif
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nsIFrame* mFirstChild;
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nsIFrame* mOverflowList;
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};
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#endif /* nsContainerFrame_h___ */
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