зеркало из https://github.com/mozilla/gecko-dev.git
145 строки
5.6 KiB
C++
145 строки
5.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* code for managing absolutely positioned children of a rendering
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* object that is a containing block for them
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*/
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#ifndef nsAbsoluteContainingBlock_h___
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#define nsAbsoluteContainingBlock_h___
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#include "nsFrameList.h"
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#include "nsHTMLReflowState.h"
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#include "nsGkAtoms.h"
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#include "nsContainerFrame.h"
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class nsIAtom;
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class nsIFrame;
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class nsPresContext;
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/**
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* This class contains the logic for being an absolute containing block. This
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* class is used within viewport frames (for frames representing content with
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* fixed position) and blocks (for frames representing absolutely positioned
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* content), since each set of frames is absolutely positioned with respect to
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* its parent.
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*
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* There is no principal child list, just a named child list which contains
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* the absolutely positioned frames (kAbsoluteList or kFixedList).
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*
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* All functions include as the first argument the frame that is delegating
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* the request.
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*
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*/
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class nsAbsoluteContainingBlock
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{
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public:
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typedef nsIFrame::ChildListID ChildListID;
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nsAbsoluteContainingBlock(ChildListID aChildListID)
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#ifdef DEBUG
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: mChildListID(aChildListID)
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#endif
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{
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NS_ASSERTION(mChildListID == nsIFrame::kAbsoluteList ||
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mChildListID == nsIFrame::kFixedList,
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"should either represent position:fixed or absolute content");
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}
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#ifdef DEBUG
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ChildListID GetChildListID() const { return mChildListID; }
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#endif
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const nsFrameList& GetChildList() const { return mAbsoluteFrames; }
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void AppendChildList(nsTArray<nsIFrame::ChildList>* aLists,
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ChildListID aListID) const
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{
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NS_ASSERTION(aListID == GetChildListID(), "wrong list ID");
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GetChildList().AppendIfNonempty(aLists, aListID);
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}
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nsresult SetInitialChildList(nsIFrame* aDelegatingFrame,
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ChildListID aListID,
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nsFrameList& aChildList);
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nsresult AppendFrames(nsIFrame* aDelegatingFrame,
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ChildListID aListID,
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nsFrameList& aFrameList);
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nsresult InsertFrames(nsIFrame* aDelegatingFrame,
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ChildListID aListID,
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nsIFrame* aPrevFrame,
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nsFrameList& aFrameList);
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void RemoveFrame(nsIFrame* aDelegatingFrame,
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ChildListID aListID,
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nsIFrame* aOldFrame);
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// Called by the delegating frame after it has done its reflow first. This
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// function will reflow any absolutely positioned child frames that need to
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// be reflowed, e.g., because the absolutely positioned child frame has
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// 'auto' for an offset, or a percentage based width or height.
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// aOverflowAreas, if non-null, is unioned with (in the local
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// coordinate space) the overflow areas of the absolutely positioned
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// children.
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nsresult Reflow(nsContainerFrame* aDelegatingFrame,
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nsPresContext* aPresContext,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aReflowStatus,
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nscoord aContainingBlockWidth,
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nscoord aContainingBlockHeight,
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bool aConstrainHeight,
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bool aCBWidthChanged,
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bool aCBHeightChanged,
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nsOverflowAreas* aOverflowAreas);
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void DestroyFrames(nsIFrame* aDelegatingFrame,
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nsIFrame* aDestructRoot);
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bool HasAbsoluteFrames() {return mAbsoluteFrames.NotEmpty();}
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// Mark our size-dependent absolute frames with NS_FRAME_HAS_DIRTY_CHILDREN
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// so that we'll make sure to reflow them.
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void MarkSizeDependentFramesDirty();
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// Mark all our absolute frames with NS_FRAME_IS_DIRTY
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void MarkAllFramesDirty();
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protected:
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// Returns true if the position of f depends on the position of
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// its placeholder or if the position or size of f depends on a
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// containing block dimension that changed.
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bool FrameDependsOnContainer(nsIFrame* f, bool aCBWidthChanged,
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bool aCBHeightChanged);
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nsresult ReflowAbsoluteFrame(nsIFrame* aDelegatingFrame,
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nsPresContext* aPresContext,
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const nsHTMLReflowState& aReflowState,
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nscoord aContainingBlockWidth,
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nscoord aContainingBlockHeight,
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bool aConstrainHeight,
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nsIFrame* aKidFrame,
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nsReflowStatus& aStatus,
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nsOverflowAreas* aOverflowAreas);
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// Mark our absolute frames dirty. If aMarkAllDirty is true, all will be
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// marked with NS_FRAME_IS_DIRTY. Otherwise, the size-dependant ones will be
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// marked with NS_FRAME_HAS_DIRTY_CHILDREN.
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void DoMarkFramesDirty(bool aMarkAllDirty);
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protected:
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nsFrameList mAbsoluteFrames; // additional named child list
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#ifdef DEBUG
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ChildListID const mChildListID; // kFixedList or kAbsoluteList
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// helper routine for debug printout
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void PrettyUC(nscoord aSize,
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char* aBuf);
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#endif
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};
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#endif /* nsnsAbsoluteContainingBlock_h___ */
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