зеркало из https://github.com/mozilla/pjs.git
1513 строки
58 KiB
C++
1513 строки
58 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 "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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* the License for the specific language governing rights and limitations
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* under the 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 Netscape Communications
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* Corporation. Portions created by Netscape are Copyright (C) 1998
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* Netscape Communications Corporation. All Rights Reserved.
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*/
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#include "nsCOMPtr.h"
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#include "nsIStyleContext.h"
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#include "nsStyleConsts.h"
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#include "nsFrame.h"
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#include "nsIHTMLReflow.h"
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#include "nsIContent.h"
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#include "nsHTMLAtoms.h"
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#include "nsIPresContext.h"
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#include "nsIPresShell.h"
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#include "nsLayoutAtoms.h"
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#include "nsIRenderingContext.h"
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#ifdef NS_DEBUG
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#undef NOISY_VERTICAL_ALIGN
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#else
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#undef NOISY_VERTICAL_ALIGN
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#endif
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// Initialize a <b>root</b> reflow state with a rendering context to
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// use for measuring things.
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nsHTMLReflowState::nsHTMLReflowState(nsIPresContext& aPresContext,
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nsIFrame* aFrame,
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nsReflowReason aReason,
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nsIRenderingContext* aRenderingContext,
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const nsSize& aAvailableSpace)
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{
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NS_PRECONDITION(nsnull != aRenderingContext, "no rendering context");
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parentReflowState = nsnull;
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frame = aFrame;
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reason = aReason;
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reflowCommand = nsnull;
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availableWidth = aAvailableSpace.width;
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availableHeight = aAvailableSpace.height;
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rendContext = aRenderingContext;
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spaceManager = nsnull;
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lineLayout = nsnull;
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isTopOfPage = PR_FALSE;
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Init(aPresContext);
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}
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// Initialize a <b>root</b> reflow state for an <b>incremental</b>
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// reflow.
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nsHTMLReflowState::nsHTMLReflowState(nsIPresContext& aPresContext,
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nsIFrame* aFrame,
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nsIReflowCommand& aReflowCommand,
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nsIRenderingContext* aRenderingContext,
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const nsSize& aAvailableSpace)
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{
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NS_PRECONDITION(nsnull != aRenderingContext, "no rendering context");
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parentReflowState = nsnull;
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frame = aFrame;
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reason = eReflowReason_Incremental;
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reflowCommand = &aReflowCommand;
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availableWidth = aAvailableSpace.width;
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availableHeight = aAvailableSpace.height;
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rendContext = aRenderingContext;
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spaceManager = nsnull;
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lineLayout = nsnull;
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isTopOfPage = PR_FALSE;
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Init(aPresContext);
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}
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// Initialize a reflow state for a child frames reflow. Some state
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// is copied from the parent reflow state; the remaining state is
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// computed.
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nsHTMLReflowState::nsHTMLReflowState(nsIPresContext& aPresContext,
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const nsHTMLReflowState& aParentReflowState,
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nsIFrame* aFrame,
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const nsSize& aAvailableSpace,
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nsReflowReason aReason)
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{
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parentReflowState = &aParentReflowState;
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frame = aFrame;
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reason = aReason;
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reflowCommand = (reason == eReflowReason_Incremental)
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? aParentReflowState.reflowCommand
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: nsnull;
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availableWidth = aAvailableSpace.width;
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availableHeight = aAvailableSpace.height;
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rendContext = aParentReflowState.rendContext;
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spaceManager = aParentReflowState.spaceManager;
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lineLayout = aParentReflowState.lineLayout;
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isTopOfPage = aParentReflowState.isTopOfPage;
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Init(aPresContext);
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}
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// Same as the previous except that the reason is taken from the
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// parent's reflow state.
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nsHTMLReflowState::nsHTMLReflowState(nsIPresContext& aPresContext,
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const nsHTMLReflowState& aParentReflowState,
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nsIFrame* aFrame,
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const nsSize& aAvailableSpace)
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{
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parentReflowState = &aParentReflowState;
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frame = aFrame;
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reason = aParentReflowState.reason;
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reflowCommand = aParentReflowState.reflowCommand;
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availableWidth = aAvailableSpace.width;
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availableHeight = aAvailableSpace.height;
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rendContext = aParentReflowState.rendContext;
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spaceManager = aParentReflowState.spaceManager;
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lineLayout = aParentReflowState.lineLayout;
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isTopOfPage = aParentReflowState.isTopOfPage;
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Init(aPresContext);
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}
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void
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nsHTMLReflowState::Init(nsIPresContext& aPresContext)
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{
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mCompactMarginWidth = 0;
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mAlignCharOffset = 0;
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mUseAlignCharOffset = 0;
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frame->GetStyleData(eStyleStruct_Position,
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(const nsStyleStruct*&)mStylePosition);
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frame->GetStyleData(eStyleStruct_Display,
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(const nsStyleStruct*&)mStyleDisplay);
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frame->GetStyleData(eStyleStruct_Spacing,
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(const nsStyleStruct*&)mStyleSpacing);
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frameType = DetermineFrameType(frame, mStylePosition, mStyleDisplay);
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InitConstraints(aPresContext);
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}
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PRBool
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nsHTMLReflowState::HaveFixedContentWidth() const
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{
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const nsStylePosition* pos;
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frame->GetStyleData(eStyleStruct_Position, (const nsStyleStruct*&)pos);
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// What about 'inherit'?
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return eStyleUnit_Auto != pos->mWidth.GetUnit();
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}
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PRBool
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nsHTMLReflowState::HaveFixedContentHeight() const
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{
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const nsStylePosition* pos;
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frame->GetStyleData(eStyleStruct_Position, (const nsStyleStruct*&)pos);
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// What about 'inherit'?
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return eStyleUnit_Auto != pos->mHeight.GetUnit();
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}
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const nsHTMLReflowState*
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nsHTMLReflowState::GetContainingBlockReflowState(const nsReflowState* aParentRS)
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{
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while (nsnull != aParentRS) {
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if (nsnull != aParentRS->frame) {
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PRBool isContainingBlock;
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// XXX This needs to go and we need to start using the info in the
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// reflow state...
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nsresult rv = aParentRS->frame->IsPercentageBase(isContainingBlock);
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if (NS_SUCCEEDED(rv) && isContainingBlock) {
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return (const nsHTMLReflowState*) aParentRS;
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}
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}
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aParentRS = aParentRS->parentReflowState;
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}
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return nsnull;
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}
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const nsHTMLReflowState*
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nsHTMLReflowState::GetPageBoxReflowState(const nsReflowState* aParentRS)
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{
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// XXX write me as soon as we can ask a frame if it's a page frame...
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return nsnull;
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}
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nscoord
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nsHTMLReflowState::GetContainingBlockContentWidth(const nsReflowState* aParentRS)
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{
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nscoord width = 0;
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const nsHTMLReflowState* rs =
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GetContainingBlockReflowState(aParentRS);
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if (nsnull != rs) {
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return ((nsHTMLReflowState*)aParentRS)->computedWidth;/* XXX cast */
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}
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return width;
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}
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nsCSSFrameType
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nsHTMLReflowState::DetermineFrameType(nsIFrame* aFrame)
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{
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const nsStylePosition* stylePosition;
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aFrame->GetStyleData(eStyleStruct_Position,
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(const nsStyleStruct*&)stylePosition);
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const nsStyleDisplay* styleDisplay;
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aFrame->GetStyleData(eStyleStruct_Display,
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(const nsStyleStruct*&)styleDisplay);
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return DetermineFrameType(aFrame, stylePosition, styleDisplay);
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}
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nsCSSFrameType
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nsHTMLReflowState::DetermineFrameType(nsIFrame* aFrame,
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const nsStylePosition* aPosition,
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const nsStyleDisplay* aDisplay)
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{
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nsCSSFrameType frameType;
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// Section 9.7 of the CSS2 spec indicates that absolute position
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// takes precedence over float which takes precedence over display.
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if (aPosition->IsAbsolutelyPositioned()) {
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frameType = NS_CSS_FRAME_TYPE_ABSOLUTE;
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}
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else if (NS_STYLE_FLOAT_NONE != aDisplay->mFloats) {
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frameType = NS_CSS_FRAME_TYPE_FLOATING;
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}
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else {
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switch (aDisplay->mDisplay) {
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case NS_STYLE_DISPLAY_BLOCK:
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case NS_STYLE_DISPLAY_LIST_ITEM:
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case NS_STYLE_DISPLAY_TABLE:
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frameType = NS_CSS_FRAME_TYPE_BLOCK;
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break;
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case NS_STYLE_DISPLAY_INLINE:
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case NS_STYLE_DISPLAY_MARKER:
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case NS_STYLE_DISPLAY_INLINE_TABLE:
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frameType = NS_CSS_FRAME_TYPE_INLINE;
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break;
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case NS_STYLE_DISPLAY_RUN_IN:
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case NS_STYLE_DISPLAY_COMPACT:
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// XXX need to look ahead at the frame's sibling
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frameType = NS_CSS_FRAME_TYPE_BLOCK;
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break;
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case NS_STYLE_DISPLAY_TABLE_CELL:
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case NS_STYLE_DISPLAY_TABLE_CAPTION:
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case NS_STYLE_DISPLAY_TABLE_ROW_GROUP:
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case NS_STYLE_DISPLAY_TABLE_COLUMN:
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case NS_STYLE_DISPLAY_TABLE_COLUMN_GROUP:
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case NS_STYLE_DISPLAY_TABLE_HEADER_GROUP:
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case NS_STYLE_DISPLAY_TABLE_FOOTER_GROUP:
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case NS_STYLE_DISPLAY_TABLE_ROW:
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frameType = NS_CSS_FRAME_TYPE_INTERNAL_TABLE;
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break;
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case NS_STYLE_DISPLAY_NONE:
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default:
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frameType = NS_CSS_FRAME_TYPE_UNKNOWN;
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break;
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}
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}
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// See if the frame is replaced
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nsFrameState frameState;
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aFrame->GetFrameState(&frameState);
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if (frameState & NS_FRAME_REPLACED_ELEMENT) {
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frameType = NS_FRAME_REPLACED(frameType);
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}
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return frameType;
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}
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void
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nsHTMLReflowState::ComputeRelativeOffsets(const nsHTMLReflowState* cbrs,
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nscoord aContainingBlockWidth,
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nscoord aContainingBlockHeight)
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{
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nsStyleCoord coord;
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// Compute the 'left' and 'right' values. 'Left' moves the boxes to the right,
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// and 'right' moves the boxes to the left. The computed values are always:
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// left=-right
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PRBool leftIsAuto = eStyleUnit_Auto == mStylePosition->mOffset.GetLeftUnit();
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PRBool rightIsAuto = eStyleUnit_Auto == mStylePosition->mOffset.GetRightUnit();
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// Check for percentage based values and an unconstrained containing
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// block width. Treat them like 'auto'
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if (NS_UNCONSTRAINEDSIZE == aContainingBlockWidth) {
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if (eStyleUnit_Percent == mStylePosition->mOffset.GetLeftUnit()) {
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leftIsAuto = PR_TRUE;
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}
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if (eStyleUnit_Percent == mStylePosition->mOffset.GetRightUnit()) {
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rightIsAuto = PR_TRUE;
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}
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}
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// If neither 'left' not 'right' are auto, then we're over-constrained and
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// we ignore one of them
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if (!leftIsAuto && !rightIsAuto) {
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const nsStyleDisplay* display;
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frame->GetStyleData(eStyleStruct_Display, (const nsStyleStruct*&)display);
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if (NS_STYLE_DIRECTION_LTR == display->mDirection) {
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rightIsAuto = PR_TRUE;
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} else {
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leftIsAuto = PR_TRUE;
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}
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}
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if (leftIsAuto) {
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if (rightIsAuto) {
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// If both are 'auto' (their initial values), the computed values are 0
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computedOffsets.left = computedOffsets.right = 0;
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} else {
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// 'Right' isn't 'auto' so compute its value
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if (eStyleUnit_Inherit == mStylePosition->mOffset.GetRightUnit()) {
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computedOffsets.right = cbrs->computedOffsets.right;
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} else {
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ComputeHorizontalValue(aContainingBlockWidth, mStylePosition->mOffset.GetRightUnit(),
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mStylePosition->mOffset.GetRight(coord),
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computedOffsets.right);
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}
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// Computed value for 'left' is minus the value of 'right'
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computedOffsets.left = -computedOffsets.right;
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}
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} else {
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NS_ASSERTION(rightIsAuto, "unexpected specified constraint");
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// 'Left' isn't 'auto' so compute its value
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if (eStyleUnit_Inherit == mStylePosition->mOffset.GetLeftUnit()) {
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computedOffsets.left = cbrs->computedOffsets.left;
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} else {
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ComputeHorizontalValue(aContainingBlockWidth, mStylePosition->mOffset.GetLeftUnit(),
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mStylePosition->mOffset.GetLeft(coord),
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computedOffsets.left);
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}
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// Computed value for 'right' is minus the value of 'left'
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computedOffsets.right = -computedOffsets.left;
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}
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// Compute the 'top' and 'bottom' values. The 'top' and 'bottom' properties
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// move relatively positioned elements up and down. They also must be each
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// other's negative
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PRBool topIsAuto = eStyleUnit_Auto == mStylePosition->mOffset.GetTopUnit();
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PRBool bottomIsAuto = eStyleUnit_Auto == mStylePosition->mOffset.GetBottomUnit();
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// Check for percentage based values and a containing block height that
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// depends on the content height. Treat them like 'auto'
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if (NS_AUTOHEIGHT == aContainingBlockHeight) {
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if (eStyleUnit_Percent == mStylePosition->mOffset.GetTopUnit()) {
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topIsAuto = PR_TRUE;
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}
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if (eStyleUnit_Percent == mStylePosition->mOffset.GetBottomUnit()) {
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bottomIsAuto = PR_TRUE;
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}
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}
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// If neither is 'auto', 'bottom' is ignored
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if (!topIsAuto && !bottomIsAuto) {
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bottomIsAuto = PR_TRUE;
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}
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if (topIsAuto) {
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if (bottomIsAuto) {
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// If both are 'auto' (their initial values), the computed values are 0
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computedOffsets.top = computedOffsets.bottom = 0;
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} else {
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// 'Bottom' isn't 'auto' so compute its value
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if (eStyleUnit_Inherit == mStylePosition->mOffset.GetBottomUnit()) {
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computedOffsets.bottom = cbrs->computedOffsets.bottom;
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} else {
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ComputeVerticalValue(aContainingBlockHeight, mStylePosition->mOffset.GetBottomUnit(),
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mStylePosition->mOffset.GetBottom(coord),
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computedOffsets.bottom);
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}
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// Computed value for 'top' is minus the value of 'bottom'
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computedOffsets.top = -computedOffsets.bottom;
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}
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} else {
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NS_ASSERTION(bottomIsAuto, "unexpected specified constraint");
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// 'Top' isn't 'auto' so compute its value
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if (eStyleUnit_Inherit == mStylePosition->mOffset.GetTopUnit()) {
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computedOffsets.top = cbrs->computedOffsets.top;
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} else {
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ComputeVerticalValue(aContainingBlockHeight, mStylePosition->mOffset.GetTopUnit(),
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mStylePosition->mOffset.GetTop(coord),
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computedOffsets.top);
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}
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// Computed value for 'bottom' is minus the value of 'top'
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computedOffsets.bottom = -computedOffsets.top;
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}
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}
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void
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nsHTMLReflowState::InitAbsoluteConstraints(nsIPresContext& aPresContext,
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const nsHTMLReflowState* cbrs,
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nscoord containingBlockWidth,
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nscoord containingBlockHeight)
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{
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// If any of the offsets are 'auto', then get the placeholder frame
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// and compute its origin relative to the containing block
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nsPoint placeholderOffset(0, 0);
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if ((eStyleUnit_Auto == mStylePosition->mOffset.GetLeftUnit()) ||
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(eStyleUnit_Auto == mStylePosition->mOffset.GetTopUnit()) ||
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(eStyleUnit_Auto == mStylePosition->mOffset.GetRightUnit()) ||
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(eStyleUnit_Auto == mStylePosition->mOffset.GetBottomUnit())) {
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// Get the placeholder frame
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nsIFrame* placeholderFrame;
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nsCOMPtr<nsIPresShell> presShell;
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aPresContext.GetShell(getter_AddRefs(presShell));
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presShell->GetPlaceholderFrameFor(frame, &placeholderFrame);
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NS_ASSERTION(nsnull != placeholderFrame, "no placeholder frame");
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if (nsnull != placeholderFrame) {
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placeholderFrame->GetOrigin(placeholderOffset);
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nsIFrame* parent;
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placeholderFrame->GetParent(&parent);
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while ((nsnull != parent) && (parent != cbrs->frame)) {
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nsPoint origin;
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parent->GetOrigin(origin);
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placeholderOffset += origin;
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parent->GetParent(&parent);
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}
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// Offsets are relative to the containing block's padding edge, so translate
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// from the frame's edge to the padding edge
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nsMargin blockBorder;
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const nsStyleSpacing* blockSpacing;
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cbrs->frame->GetStyleData(eStyleStruct_Spacing, (const nsStyleStruct*&)blockSpacing);
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blockSpacing->GetBorder(blockBorder);
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placeholderOffset.x -= blockBorder.top;
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placeholderOffset.y -= blockBorder.bottom;
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}
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}
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nsStyleUnit widthUnit = mStylePosition->mWidth.GetUnit();
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nsStyleUnit heightUnit = mStylePosition->mHeight.GetUnit();
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// Initialize the 'left' and 'right' computed offsets
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PRBool leftIsAuto = PR_FALSE, rightIsAuto = PR_FALSE;
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nsStyleCoord coord;
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if (eStyleUnit_Inherit == mStylePosition->mOffset.GetLeftUnit()) {
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computedOffsets.left = cbrs->computedOffsets.left;
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} else if (eStyleUnit_Auto == mStylePosition->mOffset.GetLeftUnit()) {
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if (NS_STYLE_DIRECTION_LTR == mStyleDisplay->mDirection) {
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computedOffsets.left = placeholderOffset.x;
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} else {
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computedOffsets.left = 0;
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leftIsAuto = PR_TRUE;
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}
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} else {
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ComputeHorizontalValue(containingBlockWidth, mStylePosition->mOffset.GetLeftUnit(),
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mStylePosition->mOffset.GetLeft(coord),
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computedOffsets.left);
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}
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if (eStyleUnit_Inherit == mStylePosition->mOffset.GetRightUnit()) {
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computedOffsets.right = cbrs->computedOffsets.right;
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} else if (eStyleUnit_Auto == mStylePosition->mOffset.GetRightUnit()) {
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if (NS_STYLE_DIRECTION_RTL == mStyleDisplay->mDirection) {
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computedOffsets.right = placeholderOffset.x;
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} else {
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computedOffsets.right = 0;
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rightIsAuto = PR_TRUE;
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}
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} else {
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ComputeHorizontalValue(containingBlockWidth, mStylePosition->mOffset.GetRightUnit(),
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mStylePosition->mOffset.GetRight(coord),
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computedOffsets.right);
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}
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// Calculate the computed width
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if (eStyleUnit_Auto == widthUnit) {
|
|
// Any remaining 'auto' values for 'left', 'right', 'margin-left', or
|
|
// 'margin-right' are replaced with 0 (their default value)
|
|
computedWidth = containingBlockWidth - computedOffsets.left -
|
|
computedMargin.left - mComputedBorderPadding.left -
|
|
mComputedBorderPadding.right -
|
|
computedMargin.right - computedOffsets.right;
|
|
|
|
if (computedWidth > mComputedMaxWidth) {
|
|
computedWidth = mComputedMaxWidth;
|
|
} else if (computedWidth < mComputedMinWidth) {
|
|
computedWidth = mComputedMinWidth;
|
|
}
|
|
|
|
} else {
|
|
if (eStyleUnit_Inherit == widthUnit) {
|
|
computedWidth = containingBlockWidth;
|
|
} else {
|
|
// Use the specified value for the computed width
|
|
ComputeHorizontalValue(containingBlockWidth, widthUnit,
|
|
mStylePosition->mWidth, computedWidth);
|
|
}
|
|
if (computedWidth > mComputedMaxWidth) {
|
|
computedWidth = mComputedMaxWidth;
|
|
} else if (computedWidth < mComputedMinWidth) {
|
|
computedWidth = mComputedMinWidth;
|
|
}
|
|
|
|
if (leftIsAuto) {
|
|
// Any 'auto' on 'margin-left' or 'margin-right' are replaced with 0
|
|
// (their default value)
|
|
computedOffsets.left = containingBlockWidth - computedMargin.left -
|
|
mComputedBorderPadding.left - computedWidth -
|
|
mComputedBorderPadding.right -
|
|
computedMargin.right - computedOffsets.right;
|
|
|
|
} else if (rightIsAuto) {
|
|
// Any 'auto' on 'margin-left' or 'margin-right' are replaced with 0
|
|
// (their default value)
|
|
computedOffsets.right = containingBlockWidth - computedOffsets.left -
|
|
computedMargin.left - mComputedBorderPadding.left - computedWidth -
|
|
mComputedBorderPadding.right - computedMargin.right;
|
|
|
|
} else {
|
|
// All that's left to solve for are 'auto' values for 'margin-left' and
|
|
// 'margin-right'
|
|
if ((eStyleUnit_Auto == mStyleSpacing->mMargin.GetLeftUnit()) ||
|
|
(eStyleUnit_Auto == mStyleSpacing->mMargin.GetRightUnit())) {
|
|
|
|
// Calculate the amount of space for margins
|
|
nscoord availMarginSpace = containingBlockWidth -
|
|
computedOffsets.left - mComputedBorderPadding.left -
|
|
computedWidth - mComputedBorderPadding.right -
|
|
computedOffsets.right;
|
|
|
|
if (eStyleUnit_Auto == mStyleSpacing->mMargin.GetLeftUnit()) {
|
|
if (eStyleUnit_Auto == mStyleSpacing->mMargin.GetRightUnit()) {
|
|
// Both 'margin-left' and 'margin-right' are 'auto', so they get
|
|
// equal values
|
|
computedMargin.left = availMarginSpace / 2;
|
|
computedMargin.right = availMarginSpace - computedMargin.left;
|
|
} else {
|
|
// Just 'margin-left' is 'auto'
|
|
computedMargin.left = availMarginSpace - computedMargin.right;
|
|
}
|
|
} else {
|
|
// Just 'margin-right' is 'auto'
|
|
computedMargin.right = availMarginSpace - computedMargin.left;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Initialize the 'top' and 'bottom' computed offsets
|
|
PRBool bottomIsAuto = PR_FALSE;
|
|
if (eStyleUnit_Inherit == mStylePosition->mOffset.GetTopUnit()) {
|
|
computedOffsets.top = cbrs->computedOffsets.top;
|
|
} else if ((eStyleUnit_Auto == mStylePosition->mOffset.GetTopUnit()) ||
|
|
((NS_AUTOHEIGHT == containingBlockHeight) &&
|
|
(eStyleUnit_Percent == mStylePosition->mOffset.GetTopUnit()))) {
|
|
// Use the placeholder position
|
|
computedOffsets.top = placeholderOffset.y;
|
|
} else {
|
|
nsStyleCoord coord;
|
|
ComputeVerticalValue(containingBlockHeight, mStylePosition->mOffset.GetTopUnit(),
|
|
mStylePosition->mOffset.GetTop(coord), computedOffsets.top);
|
|
}
|
|
if (eStyleUnit_Inherit == mStylePosition->mOffset.GetBottomUnit()) {
|
|
computedOffsets.bottom = cbrs->computedOffsets.bottom;
|
|
} else if ((eStyleUnit_Auto == mStylePosition->mOffset.GetBottomUnit()) ||
|
|
((NS_AUTOHEIGHT == containingBlockHeight) &&
|
|
(eStyleUnit_Percent == mStylePosition->mOffset.GetBottomUnit()))) {
|
|
if (eStyleUnit_Auto == heightUnit) {
|
|
computedOffsets.bottom = 0;
|
|
} else {
|
|
bottomIsAuto = PR_TRUE;
|
|
}
|
|
} else {
|
|
nsStyleCoord coord;
|
|
ComputeVerticalValue(containingBlockHeight, mStylePosition->mOffset.GetBottomUnit(),
|
|
mStylePosition->mOffset.GetBottom(coord), computedOffsets.bottom);
|
|
}
|
|
|
|
// Check for a percentage based height and a containing block height
|
|
// that depends on its content height, i.e., not explicitly specified
|
|
if (eStyleUnit_Percent == heightUnit) {
|
|
if (NS_AUTOHEIGHT == containingBlockHeight) {
|
|
// Interpret the height like 'auto'
|
|
heightUnit = eStyleUnit_Auto;
|
|
}
|
|
}
|
|
|
|
// Calculate the computed height
|
|
if (eStyleUnit_Auto == heightUnit) {
|
|
// Any 'auto' on 'margin-top' or 'margin-bottom' are replaced with 0
|
|
// (their default value)
|
|
if (NS_FRAME_IS_REPLACED(frameType)) {
|
|
computedHeight = NS_INTRINSICSIZE;
|
|
} else {
|
|
// If the containing block's height was not explicitly specified (i.e.,
|
|
// it depends on its content height), then so does our height
|
|
if (NS_AUTOHEIGHT == containingBlockHeight) {
|
|
computedHeight = NS_AUTOHEIGHT;
|
|
|
|
} else {
|
|
computedHeight = containingBlockHeight - computedOffsets.top -
|
|
computedMargin.top - mComputedBorderPadding.top -
|
|
mComputedBorderPadding.bottom -
|
|
computedMargin.bottom - computedOffsets.bottom;
|
|
|
|
if (computedHeight > mComputedMaxHeight) {
|
|
computedHeight = mComputedMaxHeight;
|
|
} else if (computedHeight < mComputedMinHeight) {
|
|
computedHeight = mComputedMinHeight;
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
if (eStyleUnit_Inherit == heightUnit) {
|
|
computedHeight = containingBlockHeight;
|
|
} else {
|
|
// Use the specified value for the computed height
|
|
ComputeVerticalValue(containingBlockHeight, heightUnit,
|
|
mStylePosition->mHeight, computedHeight);
|
|
}
|
|
|
|
if (computedHeight > mComputedMaxHeight) {
|
|
computedHeight = mComputedMaxHeight;
|
|
}
|
|
if (computedHeight < mComputedMinHeight) {
|
|
computedHeight = mComputedMinHeight;
|
|
}
|
|
|
|
if (NS_AUTOHEIGHT != containingBlockHeight) {
|
|
if (bottomIsAuto) {
|
|
// Any 'auto' on 'margin-top' or 'margin-bottom' are replaced with 0
|
|
computedOffsets.bottom = containingBlockHeight - computedOffsets.top -
|
|
computedMargin.top - mComputedBorderPadding.top - computedHeight -
|
|
mComputedBorderPadding.bottom - computedMargin.bottom;
|
|
|
|
} else {
|
|
// All that's left to solve for are 'auto' values for 'margin-top' and
|
|
// 'margin-bottom'
|
|
if ((eStyleUnit_Auto == mStyleSpacing->mMargin.GetTopUnit()) ||
|
|
(eStyleUnit_Auto == mStyleSpacing->mMargin.GetBottomUnit())) {
|
|
|
|
// Calculate the amount of space for margins
|
|
nscoord availMarginSpace = containingBlockHeight - computedOffsets.top -
|
|
mComputedBorderPadding.top - computedHeight - mComputedBorderPadding.bottom -
|
|
computedOffsets.bottom;
|
|
|
|
if (eStyleUnit_Auto == mStyleSpacing->mMargin.GetTopUnit()) {
|
|
if (eStyleUnit_Auto == mStyleSpacing->mMargin.GetBottomUnit()) {
|
|
// Both 'margin-top' and 'margin-bottom' are 'auto', so they get
|
|
// equal values
|
|
computedMargin.top = availMarginSpace / 2;
|
|
computedMargin.bottom = availMarginSpace - computedMargin.top;
|
|
} else {
|
|
// Just 'margin-top' is 'auto'
|
|
computedMargin.top = availMarginSpace - computedMargin.bottom;
|
|
}
|
|
} else {
|
|
// Just 'margin-bottom' is 'auto'
|
|
computedMargin.bottom = availMarginSpace - computedMargin.top;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Called by InitConstraints() to compute the containing block rectangle for
|
|
// the element. Handles the special logic for absolutely positioned elements
|
|
void
|
|
nsHTMLReflowState::ComputeContainingBlockRectangle(const nsHTMLReflowState* aContainingBlockRS,
|
|
nscoord& aContainingBlockWidth,
|
|
nscoord& aContainingBlockHeight)
|
|
{
|
|
// Unless the element is absolutely positioned, the containing block is
|
|
// formed by the content edge of the nearest block-level ancestor
|
|
aContainingBlockWidth = aContainingBlockRS->computedWidth;
|
|
aContainingBlockHeight = aContainingBlockRS->computedHeight;
|
|
|
|
if (NS_FRAME_GET_TYPE(frameType) == NS_CSS_FRAME_TYPE_ABSOLUTE) {
|
|
// See if the ancestor is block-level or inline-level
|
|
if (NS_FRAME_GET_TYPE(aContainingBlockRS->frameType) == NS_CSS_FRAME_TYPE_INLINE) {
|
|
// The CSS2 spec says that if the ancestor is inline-level, the containing
|
|
// block depends on the 'direction' property of the ancestor. For direction
|
|
// 'ltr', it's the top and left of the content edges of the first box and
|
|
// the bottom and right content edges of the last box
|
|
//
|
|
// XXX This is a pain because it isn't top-down and it requires that we've
|
|
// completely reflowed the ancestor. It also isn't clear what happens when
|
|
// a relatively positioned ancestor is split across pages. So instead use
|
|
// the computed width and height of the nearest block-level ancestor
|
|
const nsHTMLReflowState* cbrs = aContainingBlockRS;
|
|
while (cbrs) {
|
|
nsCSSFrameType type = NS_FRAME_GET_TYPE(cbrs->frameType);
|
|
if ((NS_CSS_FRAME_TYPE_BLOCK == type) ||
|
|
(NS_CSS_FRAME_TYPE_FLOATING == type) ||
|
|
(NS_CSS_FRAME_TYPE_ABSOLUTE == type)) {
|
|
|
|
aContainingBlockWidth = cbrs->computedWidth;
|
|
aContainingBlockHeight = cbrs->computedHeight;
|
|
|
|
if (NS_CSS_FRAME_TYPE_ABSOLUTE == type) {
|
|
aContainingBlockWidth += cbrs->mComputedPadding.left +
|
|
cbrs->mComputedPadding.right;
|
|
aContainingBlockHeight += cbrs->mComputedPadding.top +
|
|
cbrs->mComputedPadding.bottom;
|
|
}
|
|
break;
|
|
}
|
|
|
|
cbrs = (const nsHTMLReflowState*)cbrs->parentReflowState; // XXX cast
|
|
}
|
|
|
|
} else {
|
|
// If the ancestor is block-level, the containing block is formed by the
|
|
// padding edge of the ancestor
|
|
aContainingBlockWidth += aContainingBlockRS->mComputedPadding.left +
|
|
aContainingBlockRS->mComputedPadding.right;
|
|
aContainingBlockHeight += aContainingBlockRS->mComputedPadding.top +
|
|
aContainingBlockRS->mComputedPadding.bottom;
|
|
}
|
|
}
|
|
}
|
|
|
|
// XXX refactor this code to have methods for each set of properties
|
|
// we are computing: width,height,line-height; margin; offsets
|
|
|
|
void
|
|
nsHTMLReflowState::InitConstraints(nsIPresContext& aPresContext)
|
|
{
|
|
// If this is the root frame, then set the computed width and
|
|
// height equal to the available space
|
|
if (nsnull == parentReflowState) {
|
|
computedWidth = availableWidth;
|
|
computedHeight = availableHeight;
|
|
computedMargin.SizeTo(0, 0, 0, 0);
|
|
mComputedPadding.SizeTo(0, 0, 0, 0);
|
|
mComputedBorderPadding.SizeTo(0, 0, 0, 0);
|
|
computedOffsets.SizeTo(0, 0, 0, 0);
|
|
mComputedMinWidth = mComputedMinHeight = 0;
|
|
mComputedMaxWidth = mComputedMaxHeight = NS_UNCONSTRAINEDSIZE;
|
|
} else {
|
|
// Get the containing block reflow state
|
|
const nsHTMLReflowState* cbrs =
|
|
GetContainingBlockReflowState(parentReflowState);
|
|
NS_ASSERTION(nsnull != cbrs, "no containing block");
|
|
|
|
// Compute the containing block rectangle for the element
|
|
nscoord containingBlockWidth;
|
|
nscoord containingBlockHeight;
|
|
ComputeContainingBlockRectangle(cbrs, containingBlockWidth, containingBlockHeight);
|
|
|
|
// See if the element is relatively positioned
|
|
if (NS_STYLE_POSITION_RELATIVE == mStylePosition->mPosition) {
|
|
ComputeRelativeOffsets(cbrs, containingBlockWidth, containingBlockHeight);
|
|
} else {
|
|
// Initialize offsets to 0
|
|
computedOffsets.SizeTo(0, 0, 0, 0);
|
|
}
|
|
|
|
#if 0
|
|
nsFrame::ListTag(stdout, frame); printf(": cb=");
|
|
nsFrame::ListTag(stdout, cbrs->frame); printf(" size=%d,%d\n", containingBlockWidth, containingBlockHeight);
|
|
#endif
|
|
|
|
// See if the containing block height is based on the size of the
|
|
// content
|
|
if (NS_AUTOHEIGHT == containingBlockHeight) {
|
|
// See if the containing block is a scrolled frame, i.e. its
|
|
// parent is a scroll frame. The prescence of the interveening
|
|
// frame (that the scroll frame scrolls) needs to be hidden from
|
|
// the containingBlockHeight calcuation.
|
|
if (cbrs->parentReflowState) {
|
|
nsIFrame* f = cbrs->parentReflowState->frame;
|
|
nsIAtom* frameType;
|
|
|
|
f->GetFrameType(&frameType);
|
|
if (nsLayoutAtoms::scrollFrame == frameType) {
|
|
// Use the scroll frame's computed height instead
|
|
containingBlockHeight =
|
|
((nsHTMLReflowState*)cbrs->parentReflowState)->computedHeight;
|
|
}
|
|
NS_IF_RELEASE(frameType);
|
|
}
|
|
}
|
|
|
|
// Compute margins from the specified margin style information. These
|
|
// become the default computed values, and may be adjusted below
|
|
// XXX fix to provide 0,0 for the top&bottom margins for
|
|
// inline-non-replaced elements
|
|
ComputeMargin(containingBlockWidth, cbrs);
|
|
ComputePadding(containingBlockWidth, cbrs);
|
|
if (!mStyleSpacing->GetBorder(mComputedBorderPadding)) {
|
|
// CSS2 has no percentage borders
|
|
mComputedBorderPadding.SizeTo(0, 0, 0, 0);
|
|
}
|
|
mComputedBorderPadding += mComputedPadding;
|
|
|
|
nsStyleUnit widthUnit = mStylePosition->mWidth.GetUnit();
|
|
nsStyleUnit heightUnit = mStylePosition->mHeight.GetUnit();
|
|
|
|
// Check for a percentage based width and an unconstrained containing
|
|
// block width
|
|
if (eStyleUnit_Percent == widthUnit) {
|
|
if (NS_UNCONSTRAINEDSIZE == containingBlockWidth) {
|
|
// Interpret the width like 'auto'
|
|
widthUnit = eStyleUnit_Auto;
|
|
}
|
|
}
|
|
// Check for a percentage based height and a containing block height
|
|
// that depends on the content height
|
|
if (eStyleUnit_Percent == heightUnit) {
|
|
if (NS_AUTOHEIGHT == containingBlockHeight) {
|
|
// Interpret the height like 'auto'
|
|
heightUnit = eStyleUnit_Auto;
|
|
}
|
|
}
|
|
|
|
// Calculate the computed values for min and max properties
|
|
ComputeMinMaxValues(containingBlockWidth, containingBlockHeight, cbrs);
|
|
|
|
// Calculate the computed width and height. This varies by frame type
|
|
if ((NS_FRAME_REPLACED(NS_CSS_FRAME_TYPE_INLINE) == frameType) ||
|
|
(NS_FRAME_REPLACED(NS_CSS_FRAME_TYPE_FLOATING) == frameType)) {
|
|
// Inline replaced element and floating replaced element are basically
|
|
// treated the same. First calculate the computed width
|
|
if (eStyleUnit_Inherit == widthUnit) {
|
|
computedWidth = containingBlockWidth;
|
|
} else if (eStyleUnit_Auto == widthUnit) {
|
|
// A specified value of 'auto' uses the element's intrinsic width
|
|
computedWidth = NS_INTRINSICSIZE;
|
|
} else {
|
|
ComputeHorizontalValue(containingBlockWidth, widthUnit,
|
|
mStylePosition->mWidth,
|
|
computedWidth);
|
|
}
|
|
if (computedWidth > mComputedMaxWidth) {
|
|
computedWidth = mComputedMaxWidth;
|
|
} else if (computedWidth < mComputedMinWidth) {
|
|
computedWidth = mComputedMinWidth;
|
|
}
|
|
|
|
// Now calculate the computed height
|
|
if (eStyleUnit_Inherit == heightUnit) {
|
|
computedHeight = containingBlockHeight;
|
|
} else if (eStyleUnit_Auto == heightUnit) {
|
|
// A specified value of 'auto' uses the element's intrinsic height
|
|
computedHeight = NS_INTRINSICSIZE;
|
|
} else {
|
|
ComputeVerticalValue(containingBlockHeight, heightUnit,
|
|
mStylePosition->mHeight,
|
|
computedHeight);
|
|
}
|
|
if (computedHeight > mComputedMaxHeight) {
|
|
computedHeight = mComputedMaxHeight;
|
|
} else if (computedHeight < mComputedMinHeight) {
|
|
computedHeight = mComputedMinHeight;
|
|
}
|
|
|
|
} else if (NS_CSS_FRAME_TYPE_FLOATING == frameType) {
|
|
// Floating non-replaced element. First calculate the computed width
|
|
if (eStyleUnit_Inherit == widthUnit) {
|
|
computedWidth = containingBlockWidth;
|
|
} else if (eStyleUnit_Auto == widthUnit) {
|
|
// A specified value of 'auto' becomes a computed width of 0
|
|
computedWidth = 0;
|
|
} else {
|
|
ComputeHorizontalValue(containingBlockWidth, widthUnit,
|
|
mStylePosition->mWidth,
|
|
computedWidth);
|
|
}
|
|
if (computedWidth > mComputedMaxWidth) {
|
|
computedWidth = mComputedMaxWidth;
|
|
} else if (computedWidth < mComputedMinWidth) {
|
|
computedWidth = mComputedMinWidth;
|
|
}
|
|
|
|
// Now calculate the computed height
|
|
if (eStyleUnit_Inherit == heightUnit) {
|
|
computedHeight = containingBlockHeight;
|
|
} else if (eStyleUnit_Auto == heightUnit) {
|
|
computedHeight = NS_AUTOHEIGHT; // let it choose its height
|
|
} else {
|
|
ComputeVerticalValue(containingBlockHeight, heightUnit,
|
|
mStylePosition->mHeight,
|
|
computedHeight);
|
|
}
|
|
if (computedHeight > mComputedMaxHeight) {
|
|
computedHeight = mComputedMaxHeight;
|
|
} else if (computedHeight < mComputedMinHeight) {
|
|
computedHeight = mComputedMinHeight;
|
|
}
|
|
|
|
} else if (NS_CSS_FRAME_TYPE_INTERNAL_TABLE == frameType) {
|
|
// Internal table elements. The rules vary depending on the type.
|
|
// Calculate the computed width
|
|
if ((NS_STYLE_DISPLAY_TABLE_ROW == mStyleDisplay->mDisplay) ||
|
|
(NS_STYLE_DISPLAY_TABLE_ROW_GROUP == mStyleDisplay->mDisplay)) {
|
|
// 'width' property doesn't apply to table rows and row groups
|
|
widthUnit = eStyleUnit_Auto;
|
|
}
|
|
|
|
if (eStyleUnit_Inherit == widthUnit) {
|
|
computedWidth = containingBlockWidth;
|
|
} else if (eStyleUnit_Auto == widthUnit) {
|
|
computedWidth = availableWidth;
|
|
|
|
if (computedWidth != NS_UNCONSTRAINEDSIZE) {
|
|
// Internal table elements don't have margins, but they have border
|
|
// and padding
|
|
computedWidth -= mComputedBorderPadding.left +
|
|
mComputedBorderPadding.right;
|
|
}
|
|
|
|
} else {
|
|
ComputeHorizontalValue(containingBlockWidth, widthUnit,
|
|
mStylePosition->mWidth,
|
|
computedWidth);
|
|
}
|
|
|
|
// Calculate the computed height
|
|
if ((NS_STYLE_DISPLAY_TABLE_COLUMN == mStyleDisplay->mDisplay) ||
|
|
(NS_STYLE_DISPLAY_TABLE_COLUMN_GROUP == mStyleDisplay->mDisplay)) {
|
|
// 'height' property doesn't apply to table columns and column groups
|
|
heightUnit = eStyleUnit_Auto;
|
|
}
|
|
if (eStyleUnit_Inherit == heightUnit) {
|
|
computedHeight = containingBlockHeight;
|
|
} else if (eStyleUnit_Auto == heightUnit) {
|
|
computedHeight = NS_AUTOHEIGHT;
|
|
} else {
|
|
ComputeVerticalValue(containingBlockHeight, heightUnit,
|
|
mStylePosition->mHeight,
|
|
computedHeight);
|
|
}
|
|
|
|
// Doesn't apply to table elements
|
|
mComputedMinWidth = mComputedMinHeight = 0;
|
|
mComputedMaxWidth = mComputedMaxHeight = NS_UNCONSTRAINEDSIZE;
|
|
|
|
} else if (NS_FRAME_GET_TYPE(frameType) == NS_CSS_FRAME_TYPE_ABSOLUTE) {
|
|
InitAbsoluteConstraints(aPresContext, cbrs, containingBlockWidth,
|
|
containingBlockHeight);
|
|
} else if (NS_CSS_FRAME_TYPE_INLINE == frameType) {
|
|
// Inline non-replaced elements do not have computed widths or heights
|
|
// XXX add this check to HaveFixedContentHeight/Width too
|
|
computedWidth = NS_UNCONSTRAINEDSIZE;
|
|
computedHeight = NS_UNCONSTRAINEDSIZE;
|
|
computedMargin.top = 0;
|
|
computedMargin.bottom = 0;
|
|
mComputedMinWidth = mComputedMinHeight = 0;
|
|
mComputedMaxWidth = mComputedMaxHeight = NS_UNCONSTRAINEDSIZE;
|
|
} else {
|
|
ComputeBlockBoxData(aPresContext, cbrs, widthUnit, heightUnit,
|
|
containingBlockWidth,
|
|
containingBlockHeight);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Compute the box data for block and block-replaced elements in the
|
|
// normal flow.
|
|
void
|
|
nsHTMLReflowState::ComputeBlockBoxData(nsIPresContext& aPresContext,
|
|
const nsHTMLReflowState* cbrs,
|
|
nsStyleUnit aWidthUnit,
|
|
nsStyleUnit aHeightUnit,
|
|
nscoord aContainingBlockWidth,
|
|
nscoord aContainingBlockHeight)
|
|
{
|
|
// Compute the content width
|
|
if (eStyleUnit_Auto == aWidthUnit) {
|
|
if (NS_FRAME_IS_REPLACED(frameType)) {
|
|
// Block-level replaced element in the flow. A specified value of
|
|
// 'auto' uses the element's intrinsic width (CSS2 10.3.4)
|
|
computedWidth = NS_INTRINSICSIZE;
|
|
} else {
|
|
// Block-level non-replaced element in the flow. 'auto' values
|
|
// for margin-left and margin-right become 0 and the sum of the
|
|
// areas must equal the width of the content-area of the parent
|
|
// element.
|
|
if (NS_UNCONSTRAINEDSIZE == availableWidth) {
|
|
// During pass1 table reflow, auto side margin values are
|
|
// uncomputable (== 0).
|
|
computedWidth = NS_UNCONSTRAINEDSIZE;
|
|
} else {
|
|
computedWidth = availableWidth - computedMargin.left -
|
|
computedMargin.right - mComputedBorderPadding.left -
|
|
mComputedBorderPadding.right;
|
|
|
|
// Take into account any min and max values
|
|
if (computedWidth > mComputedMaxWidth) {
|
|
// Apply the rules again, but this time using 'max-width' as
|
|
// the value for 'width'
|
|
computedWidth = mComputedMaxWidth;
|
|
} else if (computedWidth < mComputedMinWidth) {
|
|
// Apply the rules again, but this time using 'min-width' as
|
|
// the value for 'width'
|
|
computedWidth = mComputedMinWidth;
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
if (eStyleUnit_Inherit == aWidthUnit) {
|
|
// Use parent elements width. Note that if its width was
|
|
// 'inherit', then it already did this so we don't need to
|
|
// recurse upwards.
|
|
//
|
|
// We use the containing blocks width here for the "parent"
|
|
// elements width, because we want to skip over any intervening
|
|
// inline elements (since width doesn't apply to them).
|
|
if (NS_UNCONSTRAINEDSIZE != aContainingBlockWidth) {
|
|
computedWidth = aContainingBlockWidth;
|
|
}
|
|
else {
|
|
computedWidth = NS_UNCONSTRAINEDSIZE;
|
|
}
|
|
}
|
|
else {
|
|
ComputeHorizontalValue(aContainingBlockWidth, aWidthUnit,
|
|
mStylePosition->mWidth, computedWidth);
|
|
}
|
|
|
|
// Take into account any min and max values
|
|
if (computedWidth > mComputedMaxWidth) {
|
|
computedWidth = mComputedMaxWidth;
|
|
} else if (computedWidth < mComputedMinWidth) {
|
|
computedWidth = mComputedMinWidth;
|
|
}
|
|
|
|
// Now that we have the computed-width, compute the side margins
|
|
CalculateBlockSideMargins(cbrs, computedWidth);
|
|
}
|
|
|
|
|
|
// Compute the content height
|
|
if (eStyleUnit_Inherit == aHeightUnit) {
|
|
// Use parent elements height (note that if its height was inherit
|
|
// then it already did this so we don't need to recurse upwards).
|
|
//
|
|
// We use the containing blocks height here for the "parent"
|
|
// elements height because we want to skip over any interveening
|
|
// inline elements (since height doesn't apply to them).
|
|
if (NS_UNCONSTRAINEDSIZE != aContainingBlockHeight) {
|
|
computedHeight = aContainingBlockHeight;
|
|
}
|
|
else {
|
|
computedHeight = NS_UNCONSTRAINEDSIZE;
|
|
}
|
|
} else if (eStyleUnit_Auto == aHeightUnit) {
|
|
if (NS_FRAME_IS_REPLACED(frameType)) {
|
|
// For replaced elements use the intrinsic size for "auto"
|
|
computedHeight = NS_INTRINSICSIZE;
|
|
} else {
|
|
// For non-replaced elements auto means unconstrained
|
|
computedHeight = NS_UNCONSTRAINEDSIZE;
|
|
}
|
|
} else {
|
|
ComputeVerticalValue(aContainingBlockHeight, aHeightUnit,
|
|
mStylePosition->mHeight, computedHeight);
|
|
}
|
|
if (computedHeight > mComputedMaxHeight) {
|
|
computedHeight = mComputedMaxHeight;
|
|
} else if (computedHeight < mComputedMinHeight) {
|
|
computedHeight = mComputedMinHeight;
|
|
}
|
|
}
|
|
|
|
// This code enforces section 10.3.3 of the CSS2 spec for this formula:
|
|
//
|
|
// 'margin-left' + 'border-left-width' + 'padding-left' + 'width' +
|
|
// 'padding-right' + 'border-right-width' + 'margin-right'
|
|
// = width of containing block
|
|
//
|
|
// Note: the width unit is not auto when this is called
|
|
void
|
|
nsHTMLReflowState::CalculateBlockSideMargins(const nsHTMLReflowState* cbrs,
|
|
nscoord aComputedWidth)
|
|
{
|
|
// We can only provide values for auto side margins in a constrained
|
|
// reflow. For unconstrained reflow there is no effective width to
|
|
// compute against...
|
|
if ((NS_UNCONSTRAINEDSIZE == aComputedWidth) ||
|
|
(NS_UNCONSTRAINEDSIZE == cbrs->computedWidth)) {
|
|
return;
|
|
}
|
|
|
|
nscoord sum = computedMargin.left + mComputedBorderPadding.left +
|
|
aComputedWidth + mComputedBorderPadding.right + computedMargin.right;
|
|
if (sum == cbrs->computedWidth) {
|
|
// The sum is already correct
|
|
return;
|
|
}
|
|
|
|
// Determine the left and right margin values. The width value
|
|
// remains constant while we do this.
|
|
PRBool isAutoLeftMargin =
|
|
eStyleUnit_Auto == mStyleSpacing->mMargin.GetLeftUnit();
|
|
PRBool isAutoRightMargin =
|
|
eStyleUnit_Auto == mStyleSpacing->mMargin.GetRightUnit();
|
|
|
|
// Calculate how much space is available for margins
|
|
nscoord availMarginSpace = cbrs->computedWidth - aComputedWidth -
|
|
mComputedBorderPadding.left - mComputedBorderPadding.right;
|
|
|
|
// See whether we're over constrained
|
|
if (!isAutoLeftMargin && !isAutoRightMargin) {
|
|
// Neither margin is 'auto' so we're over constrained. Use the
|
|
// 'direction' property to tell which margin to ignore
|
|
if (NS_STYLE_DIRECTION_LTR == mStyleDisplay->mDirection) {
|
|
isAutoRightMargin = PR_TRUE;
|
|
} else {
|
|
isAutoLeftMargin = PR_TRUE;
|
|
}
|
|
}
|
|
|
|
if (isAutoLeftMargin) {
|
|
if (isAutoRightMargin) {
|
|
// Both margins are 'auto' so their computed values are equal
|
|
computedMargin.left = availMarginSpace / 2;
|
|
computedMargin.right = availMarginSpace - computedMargin.left;
|
|
} else {
|
|
computedMargin.left = availMarginSpace - computedMargin.right;
|
|
}
|
|
} else if (isAutoRightMargin) {
|
|
computedMargin.right = availMarginSpace - computedMargin.left;
|
|
}
|
|
}
|
|
|
|
#if 0
|
|
// XXX I have no idea if this is right or not -- kipp
|
|
void
|
|
nsHTMLReflowState::CalculateTableSideMargins(const nsHTMLReflowState* cbrs,
|
|
nscoord aComputedWidth)
|
|
{
|
|
// We can only provide values for auto side margins in a constrained
|
|
// reflow. For unconstrained reflow there is no effective width to
|
|
// compute against...
|
|
if ((NS_UNCONSTRAINEDSIZE != aComputedWidth) &&
|
|
(NS_UNCONSTRAINEDSIZE != cbrs->computedWidth)) {
|
|
PRBool isAutoLeftMargin =
|
|
eStyleUnit_Auto == mStyleSpacing->mMargin.GetLeftUnit();
|
|
PRBool isAutoRightMargin =
|
|
eStyleUnit_Auto == mStyleSpacing->mMargin.GetRightUnit();
|
|
|
|
// Calculate how much space is available for margins
|
|
nscoord availMarginSpace = cbrs->computedWidth - aComputedWidth -
|
|
mComputedBorderPadding.left - mComputedBorderPadding.right;
|
|
|
|
if (availMarginSpace != 0) {
|
|
// See whether we're over constrained
|
|
if (isAutoLeftMargin) {
|
|
if (isAutoRightMargin) {
|
|
// Both margins are 'auto' so their computed values are equal
|
|
computedMargin.left = availMarginSpace / 2;
|
|
computedMargin.right = availMarginSpace - computedMargin.left;
|
|
} else {
|
|
computedMargin.left = availMarginSpace - computedMargin.right;
|
|
}
|
|
} else if (isAutoRightMargin) {
|
|
computedMargin.right = availMarginSpace - computedMargin.left;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
nscoord
|
|
nsHTMLReflowState::CalcLineHeight(nsIPresContext& aPresContext,
|
|
nsIFrame* aFrame)
|
|
{
|
|
nscoord lineHeight = -1;
|
|
nsIStyleContext* sc;
|
|
aFrame->GetStyleContext(&sc);
|
|
const nsStyleFont* elementFont = nsnull;
|
|
if (nsnull != sc) {
|
|
elementFont = (const nsStyleFont*)sc->GetStyleData(eStyleStruct_Font);
|
|
for (;;) {
|
|
const nsStyleText* text = (const nsStyleText*)
|
|
sc->GetStyleData(eStyleStruct_Text);
|
|
if (nsnull != text) {
|
|
nsStyleUnit unit = text->mLineHeight.GetUnit();
|
|
if (eStyleUnit_Normal == unit) {
|
|
// Normal value
|
|
#ifdef NOISY_VERTICAL_ALIGN
|
|
printf(" line-height: normal\n");
|
|
#endif
|
|
break;
|
|
} else if (eStyleUnit_Factor == unit) {
|
|
// CSS2 spec says that the number is inherited, not the
|
|
// computed value. Therefore use the font size of the
|
|
// element times the inherited number.
|
|
nscoord size = elementFont->mFont.size;
|
|
lineHeight = nscoord(size * text->mLineHeight.GetFactorValue());
|
|
if (lineHeight < 0) {
|
|
lineHeight = -1;
|
|
}
|
|
#ifdef NOISY_VERTICAL_ALIGN
|
|
printf(" line-height: factor=%g result=%d\n",
|
|
text->mLineHeight.GetFactorValue(), lineHeight);
|
|
#endif
|
|
break;
|
|
}
|
|
else if (eStyleUnit_Coord == unit) {
|
|
lineHeight = text->mLineHeight.GetCoordValue();
|
|
if (lineHeight < 0) {
|
|
lineHeight = -1;
|
|
}
|
|
break;
|
|
}
|
|
else if (eStyleUnit_Percent == unit) {
|
|
// XXX This could arguably be the font-metrics actual height
|
|
// instead since the spec says use the computed height.
|
|
const nsStyleFont* font = (const nsStyleFont*)
|
|
sc->GetStyleData(eStyleStruct_Font);
|
|
nscoord size = font->mFont.size;
|
|
lineHeight = nscoord(size * text->mLineHeight.GetPercentValue());
|
|
if (lineHeight < 0) {
|
|
lineHeight = -1;
|
|
}
|
|
break;
|
|
}
|
|
else if (eStyleUnit_Inherit == unit) {
|
|
nsIStyleContext* parentSC;
|
|
parentSC = sc->GetParent();
|
|
if (nsnull == parentSC) {
|
|
// Note: Break before releasing to avoid double-releasing sc
|
|
break;
|
|
}
|
|
NS_RELEASE(sc);
|
|
sc = parentSC;
|
|
}
|
|
else {
|
|
// other units are not part of the spec so don't bother
|
|
// looping
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
NS_RELEASE(sc);
|
|
}
|
|
|
|
return lineHeight;
|
|
}
|
|
|
|
void
|
|
nsHTMLReflowState::ComputeHorizontalValue(nscoord aContainingBlockWidth,
|
|
nsStyleUnit aUnit,
|
|
const nsStyleCoord& aCoord,
|
|
nscoord& aResult)
|
|
{
|
|
NS_PRECONDITION(eStyleUnit_Inherit != aUnit, "unexpected unit");
|
|
aResult = 0;
|
|
if (eStyleUnit_Percent == aUnit) {
|
|
if (NS_UNCONSTRAINEDSIZE == aContainingBlockWidth) {
|
|
aResult = 0;
|
|
} else {
|
|
float pct = aCoord.GetPercentValue();
|
|
aResult = NSToCoordFloor(aContainingBlockWidth * pct);
|
|
}
|
|
|
|
} else if (eStyleUnit_Coord == aUnit) {
|
|
aResult = aCoord.GetCoordValue();
|
|
}
|
|
else if (eStyleUnit_Chars == aUnit) {
|
|
if ((nsnull == rendContext) || (nsnull == frame)) {
|
|
// We can't compute it without a rendering context or frame, so
|
|
// pretend its zero...
|
|
}
|
|
else {
|
|
const nsStyleFont* font;
|
|
frame->GetStyleData(eStyleStruct_Font, (const nsStyleStruct*&) font);
|
|
rendContext->SetFont(font->mFont);
|
|
nscoord fontWidth;
|
|
rendContext->GetWidth('M', fontWidth);
|
|
aResult = aCoord.GetIntValue() * fontWidth;
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
nsHTMLReflowState::ComputeVerticalValue(nscoord aContainingBlockHeight,
|
|
nsStyleUnit aUnit,
|
|
const nsStyleCoord& aCoord,
|
|
nscoord& aResult)
|
|
{
|
|
NS_PRECONDITION(eStyleUnit_Inherit != aUnit, "unexpected unit");
|
|
aResult = 0;
|
|
if (eStyleUnit_Percent == aUnit) {
|
|
// Verify no one is trying to calculate a percentage based height against
|
|
// a height that's shrink wrapping to its content. In that case they should
|
|
// treat the specified value like 'auto'
|
|
NS_ASSERTION(NS_AUTOHEIGHT != aContainingBlockHeight, "unexpected containing block height");
|
|
float pct = aCoord.GetPercentValue();
|
|
aResult = NSToCoordFloor(aContainingBlockHeight * pct);
|
|
|
|
} else if (eStyleUnit_Coord == aUnit) {
|
|
aResult = aCoord.GetCoordValue();
|
|
}
|
|
}
|
|
|
|
void
|
|
nsHTMLReflowState::ComputeMargin(nscoord aContainingBlockWidth,
|
|
const nsHTMLReflowState* aContainingBlockRS)
|
|
{
|
|
// If style style can provide us the margin directly, then use it.
|
|
if (!mStyleSpacing->GetMargin(computedMargin)) {
|
|
// We have to compute the value
|
|
if (NS_UNCONSTRAINEDSIZE == aContainingBlockWidth) {
|
|
computedMargin.left = 0;
|
|
computedMargin.right = 0;
|
|
|
|
} else {
|
|
nsStyleCoord left, right;
|
|
|
|
if (eStyleUnit_Inherit == mStyleSpacing->mMargin.GetLeftUnit()) {
|
|
computedMargin.left = aContainingBlockRS->computedMargin.left;
|
|
} else {
|
|
ComputeHorizontalValue(aContainingBlockWidth,
|
|
mStyleSpacing->mMargin.GetLeftUnit(),
|
|
mStyleSpacing->mMargin.GetLeft(left),
|
|
computedMargin.left);
|
|
}
|
|
if (eStyleUnit_Inherit == mStyleSpacing->mMargin.GetRightUnit()) {
|
|
computedMargin.right = aContainingBlockRS->computedMargin.right;
|
|
} else {
|
|
ComputeHorizontalValue(aContainingBlockWidth,
|
|
mStyleSpacing->mMargin.GetRightUnit(),
|
|
mStyleSpacing->mMargin.GetRight(right),
|
|
computedMargin.right);
|
|
}
|
|
}
|
|
|
|
const nsHTMLReflowState* rs2 = GetPageBoxReflowState(parentReflowState);
|
|
nsStyleCoord top, bottom;
|
|
if (nsnull != rs2) {
|
|
// According to the CSS2 spec, margin percentages are
|
|
// calculated with respect to the *height* of the containing
|
|
// block when in a paginated context.
|
|
if (eStyleUnit_Inherit == mStyleSpacing->mMargin.GetTopUnit()) {
|
|
computedMargin.top = aContainingBlockRS->computedMargin.top;
|
|
} else {
|
|
ComputeVerticalValue(rs2->computedHeight,
|
|
mStyleSpacing->mMargin.GetTopUnit(),
|
|
mStyleSpacing->mMargin.GetTop(top),
|
|
computedMargin.top);
|
|
}
|
|
if (eStyleUnit_Inherit == mStyleSpacing->mMargin.GetBottomUnit()) {
|
|
computedMargin.bottom = aContainingBlockRS->computedMargin.bottom;
|
|
} else {
|
|
ComputeVerticalValue(rs2->computedHeight,
|
|
mStyleSpacing->mMargin.GetBottomUnit(),
|
|
mStyleSpacing->mMargin.GetBottom(bottom),
|
|
computedMargin.bottom);
|
|
}
|
|
}
|
|
else {
|
|
// According to the CSS2 spec, margin percentages are
|
|
// calculated with respect to the *width* of the containing
|
|
// block, even for margin-top and margin-bottom.
|
|
if (NS_UNCONSTRAINEDSIZE == aContainingBlockWidth) {
|
|
computedMargin.top = 0;
|
|
computedMargin.bottom = 0;
|
|
|
|
} else {
|
|
if (eStyleUnit_Inherit == mStyleSpacing->mMargin.GetTopUnit()) {
|
|
computedMargin.top = aContainingBlockRS->computedMargin.top;
|
|
} else {
|
|
ComputeHorizontalValue(aContainingBlockWidth,
|
|
mStyleSpacing->mMargin.GetTopUnit(),
|
|
mStyleSpacing->mMargin.GetTop(top),
|
|
computedMargin.top);
|
|
}
|
|
if (eStyleUnit_Inherit == mStyleSpacing->mMargin.GetBottomUnit()) {
|
|
computedMargin.bottom = aContainingBlockRS->computedMargin.bottom;
|
|
} else {
|
|
ComputeHorizontalValue(aContainingBlockWidth,
|
|
mStyleSpacing->mMargin.GetBottomUnit(),
|
|
mStyleSpacing->mMargin.GetBottom(bottom),
|
|
computedMargin.bottom);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
nsHTMLReflowState::ComputePadding(nscoord aContainingBlockWidth,
|
|
const nsHTMLReflowState* aContainingBlockRS)
|
|
|
|
{
|
|
// If style can provide us the padding directly, then use it.
|
|
if (!mStyleSpacing->GetPadding(mComputedPadding)) {
|
|
// We have to compute the value
|
|
nsStyleCoord left, right, top, bottom;
|
|
|
|
if (eStyleUnit_Inherit == mStyleSpacing->mPadding.GetLeftUnit()) {
|
|
mComputedPadding.left = aContainingBlockRS->mComputedPadding.left;
|
|
} else {
|
|
ComputeHorizontalValue(aContainingBlockWidth,
|
|
mStyleSpacing->mPadding.GetLeftUnit(),
|
|
mStyleSpacing->mPadding.GetLeft(left),
|
|
mComputedPadding.left);
|
|
}
|
|
if (eStyleUnit_Inherit == mStyleSpacing->mPadding.GetRightUnit()) {
|
|
mComputedPadding.right = aContainingBlockRS->mComputedPadding.right;
|
|
} else {
|
|
ComputeHorizontalValue(aContainingBlockWidth,
|
|
mStyleSpacing->mPadding.GetRightUnit(),
|
|
mStyleSpacing->mPadding.GetRight(right),
|
|
mComputedPadding.right);
|
|
}
|
|
|
|
// According to the CSS2 spec, percentages are calculated with respect to
|
|
// containing block width for padding-top and padding-bottom
|
|
if (eStyleUnit_Inherit == mStyleSpacing->mPadding.GetTopUnit()) {
|
|
mComputedPadding.top = aContainingBlockRS->mComputedPadding.top;
|
|
} else {
|
|
ComputeHorizontalValue(aContainingBlockWidth,
|
|
mStyleSpacing->mPadding.GetTopUnit(),
|
|
mStyleSpacing->mPadding.GetTop(top),
|
|
mComputedPadding.top);
|
|
}
|
|
if (eStyleUnit_Inherit == mStyleSpacing->mPadding.GetBottomUnit()) {
|
|
mComputedPadding.bottom = aContainingBlockRS->mComputedPadding.bottom;
|
|
} else {
|
|
ComputeHorizontalValue(aContainingBlockWidth,
|
|
mStyleSpacing->mPadding.GetBottomUnit(),
|
|
mStyleSpacing->mPadding.GetBottom(bottom),
|
|
mComputedPadding.bottom);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
nsHTMLReflowState::ComputeMinMaxValues(nscoord aContainingBlockWidth,
|
|
nscoord aContainingBlockHeight,
|
|
const nsHTMLReflowState* aContainingBlockRS)
|
|
{
|
|
nsStyleUnit minWidthUnit = mStylePosition->mMinWidth.GetUnit();
|
|
if (eStyleUnit_Inherit == minWidthUnit) {
|
|
mComputedMinWidth = aContainingBlockRS->mComputedMinWidth;
|
|
} else {
|
|
ComputeHorizontalValue(aContainingBlockWidth, minWidthUnit,
|
|
mStylePosition->mMinWidth, mComputedMinWidth);
|
|
}
|
|
nsStyleUnit maxWidthUnit = mStylePosition->mMaxWidth.GetUnit();
|
|
if (eStyleUnit_Inherit == maxWidthUnit) {
|
|
mComputedMaxWidth = aContainingBlockRS->mComputedMaxWidth;
|
|
} else if (eStyleUnit_Null == maxWidthUnit) {
|
|
// Specified value of 'none'
|
|
mComputedMaxWidth = NS_UNCONSTRAINEDSIZE; // no limit
|
|
} else {
|
|
ComputeHorizontalValue(aContainingBlockWidth, maxWidthUnit,
|
|
mStylePosition->mMaxWidth, mComputedMaxWidth);
|
|
}
|
|
|
|
// If the computed value of 'min-width' is greater than the value of
|
|
// 'max-width', 'max-width' is set to the value of 'min-width'
|
|
if (mComputedMinWidth > mComputedMaxWidth) {
|
|
mComputedMaxWidth = mComputedMinWidth;
|
|
}
|
|
|
|
nsStyleUnit minHeightUnit = mStylePosition->mMinHeight.GetUnit();
|
|
if (eStyleUnit_Inherit == minHeightUnit) {
|
|
mComputedMinHeight = aContainingBlockRS->mComputedMinHeight;
|
|
} else {
|
|
// Check for percentage based values and a containing block height that
|
|
// depends on the content height. Treat them like 'auto'
|
|
if ((NS_AUTOHEIGHT == aContainingBlockHeight) &&
|
|
(eStyleUnit_Percent == minHeightUnit)) {
|
|
mComputedMinHeight = 0;
|
|
} else {
|
|
ComputeVerticalValue(aContainingBlockHeight, minHeightUnit,
|
|
mStylePosition->mMinHeight, mComputedMinHeight);
|
|
}
|
|
}
|
|
nsStyleUnit maxHeightUnit = mStylePosition->mMaxHeight.GetUnit();
|
|
if (eStyleUnit_Inherit == maxHeightUnit) {
|
|
mComputedMaxHeight = aContainingBlockRS->mComputedMaxHeight;
|
|
} else if (eStyleUnit_Null == maxHeightUnit) {
|
|
// Specified value of 'none'
|
|
mComputedMaxHeight = NS_UNCONSTRAINEDSIZE; // no limit
|
|
} else {
|
|
// Check for percentage based values and a containing block height that
|
|
// depends on the content height. Treat them like 'auto'
|
|
if ((NS_AUTOHEIGHT == aContainingBlockHeight) &&
|
|
(eStyleUnit_Percent == maxHeightUnit)) {
|
|
mComputedMaxHeight = NS_UNCONSTRAINEDSIZE;
|
|
} else {
|
|
ComputeVerticalValue(aContainingBlockHeight, maxHeightUnit,
|
|
mStylePosition->mMaxHeight, mComputedMaxHeight);
|
|
}
|
|
}
|
|
|
|
// If the computed value of 'min-height' is greater than the value of
|
|
// 'max-height', 'max-height' is set to the value of 'min-height'
|
|
if (mComputedMinHeight > mComputedMaxHeight) {
|
|
mComputedMaxHeight = mComputedMinHeight;
|
|
}
|
|
}
|