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138 lines
5.3 KiB
C++
138 lines
5.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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// vim:cindent:ts=2:et:sw=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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/* class that a parent frame uses to reflow a block frame */
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#ifndef nsBlockReflowContext_h___
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#define nsBlockReflowContext_h___
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#include "nsIFrame.h"
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#include "nsHTMLReflowMetrics.h"
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class nsBlockFrame;
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class nsBlockReflowState;
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struct nsHTMLReflowState;
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class nsLineBox;
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class nsIFrame;
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class nsPresContext;
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class nsLineLayout;
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struct nsStylePosition;
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struct nsBlockHorizontalAlign;
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/**
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* An encapsulation of the state and algorithm for reflowing block frames.
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*/
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class nsBlockReflowContext {
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public:
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nsBlockReflowContext(nsPresContext* aPresContext,
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const nsHTMLReflowState& aParentRS);
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~nsBlockReflowContext() { }
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nsresult ReflowBlock(const nsRect& aSpace,
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PRBool aApplyTopMargin,
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nsCollapsingMargin& aPrevMargin,
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nscoord aClearance,
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PRBool aIsAdjacentWithTop,
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nsMargin& aComputedOffsets,
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nsHTMLReflowState& aReflowState,
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nsReflowStatus& aReflowStatus);
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PRBool PlaceBlock(const nsHTMLReflowState& aReflowState,
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PRBool aForceFit,
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nsLineBox* aLine,
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const nsMargin& aComputedOffsets,
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nsCollapsingMargin& aBottomMarginResult /* out */,
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nsRect& aInFlowBounds,
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nsRect& aCombinedRect,
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nsReflowStatus aReflowStatus);
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nsCollapsingMargin& GetCarriedOutBottomMargin() {
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return mMetrics.mCarriedOutBottomMargin;
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}
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nscoord GetTopMargin() const {
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return mTopMargin.get();
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}
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const nsMargin& GetMargin() const {
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return mMargin;
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}
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const nsHTMLReflowMetrics& GetMetrics() const {
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return mMetrics;
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}
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/**
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* Computes the collapsed top margin for a block whose reflow state is in aRS.
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* The computed margin is added into aMargin.
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* If aClearanceFrame is null then this is the first optimistic pass which shall assume
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* that no frames have clearance, and we clear the HasClearance on all frames encountered.
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* If non-null, this is the second pass and
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* the caller has decided aClearanceFrame needs clearance (and we will
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* therefore stop collapsing there); also, this function is responsible for marking
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* it with SetHasClearance.
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* If in the optimistic pass any frame is encountered that might possibly need
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* clearance (i.e., if we really needed the optimism assumption) then we set aMayNeedRetry
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* to true.
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* We return PR_TRUE if we changed the clearance state of any line and marked it dirty.
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*/
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static PRBool ComputeCollapsedTopMargin(const nsHTMLReflowState& aRS,
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nsCollapsingMargin* aMargin, nsIFrame* aClearanceFrame,
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PRBool* aMayNeedRetry, PRBool* aIsEmpty = nsnull);
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protected:
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nsPresContext* mPresContext;
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const nsHTMLReflowState& mOuterReflowState;
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nsIFrame* mFrame;
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nsRect mSpace;
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// Spacing style for the frame we are reflowing; only valid after reflow
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const nsStyleBorder* mStyleBorder;
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const nsStyleMargin* mStyleMargin;
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const nsStylePadding* mStylePadding;
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nscoord mComputedWidth; // copy of reflowstate's computedWidth
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nsMargin mMargin;
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nscoord mX, mY;
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nsHTMLReflowMetrics mMetrics;
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nsCollapsingMargin mTopMargin;
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};
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#endif /* nsBlockReflowContext_h___ */
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