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849 lines
31 KiB
C++
849 lines
31 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
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations 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
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#include "nsBlockReflowContext.h"
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#include "nsLineLayout.h"
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#include "nsHTMLIIDs.h"
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#include "nsISpaceManager.h"
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#include "nsIFontMetrics.h"
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#include "nsIPresContext.h"
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#include "nsIContent.h"
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#include "nsIStyleContext.h"
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#include "nsIReflowCommand.h"
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#include "nsHTMLContainerFrame.h"
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#include "nsBlockFrame.h"
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#include "nsIDOMHTMLParagraphElement.h"
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#include "nsCOMPtr.h"
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#ifdef NS_DEBUG
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#undef NOISY_MAX_ELEMENT_SIZE
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#undef REALLY_NOISY_MAX_ELEMENT_SIZE
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#undef NOISY_VERTICAL_MARGINS
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#else
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#undef NOISY_MAX_ELEMENT_SIZE
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#undef REALLY_NOISY_MAX_ELEMENT_SIZE
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#undef NOISY_VERTICAL_MARGINS
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#endif
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nsBlockReflowContext::nsBlockReflowContext(nsIPresContext* aPresContext,
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const nsHTMLReflowState& aParentRS,
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PRBool aComputeMaxElementSize,
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PRBool aComputeMaximumWidth)
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: mPresContext(aPresContext),
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mOuterReflowState(aParentRS),
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mMetrics(aComputeMaxElementSize ? &mMaxElementSize : nsnull),
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mMaxElementSize(0, 0),
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mIsTable(PR_FALSE),
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mComputeMaximumWidth(aComputeMaximumWidth),
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mBlockShouldInvalidateItself(PR_FALSE)
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{
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mStyleSpacing = nsnull;
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if (mComputeMaximumWidth)
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mMetrics.mFlags |= NS_REFLOW_CALC_MAX_WIDTH;
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}
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PRBool
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nsBlockReflowContext::IsHTMLParagraph(nsIFrame* aFrame)
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{
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PRBool result = PR_FALSE;
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nsCOMPtr<nsIContent> content;
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nsresult rv = aFrame->GetContent(getter_AddRefs(content));
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if (NS_SUCCEEDED(rv) && content) {
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nsCOMPtr<nsIDOMHTMLParagraphElement> p(do_QueryInterface(content));
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if (p) {
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result = PR_TRUE;
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}
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}
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return result;
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}
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nscoord
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nsBlockReflowContext::ComputeCollapsedTopMargin(nsIPresContext* aPresContext,
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nsHTMLReflowState& aRS)
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{
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// Get aFrame's top margin
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nscoord topMargin = aRS.mComputedMargin.top;
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// Calculate aFrame's generational top-margin from its child
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// blocks. Note that if aFrame has a non-zero top-border or
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// top-padding then this step is skipped because it will be a margin
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// root.
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nscoord generationalTopMargin = 0;
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if (0 == aRS.mComputedBorderPadding.top) {
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nsBlockFrame* bf;
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if (NS_SUCCEEDED(aRS.frame->QueryInterface(kBlockFrameCID, (void**)&bf))) {
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// Ask the block frame for the top block child that we should
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// try to collapse the top margin with.
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nsIFrame* childFrame = bf->GetTopBlockChild();
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if (nsnull != childFrame) {
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// Here is where we recurse. Now that we have determined that a
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// generational collapse is required we need to compute the
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// child blocks margin and so in so that we can look into
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// it. For its margins to be computed we need to have a reflow
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// state for it.
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nsSize availSpace(aRS.mComputedWidth, aRS.mComputedHeight);
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nsHTMLReflowState reflowState(aPresContext, aRS, childFrame,
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availSpace);
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generationalTopMargin =
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ComputeCollapsedTopMargin(aPresContext, reflowState);
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}
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}
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}
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// Now compute the collapsed top-margin value. At this point we have
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// the child frames effective top margin value.
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nscoord collapsedTopMargin = MaxMargin(topMargin, generationalTopMargin);
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#ifdef NOISY_VERTICAL_MARGINS
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nsFrame::ListTag(stdout, aRS.frame);
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printf(": topMargin=%d generationalTopMargin=%d => %d\n",
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topMargin, generationalTopMargin, collapsedTopMargin);
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#endif
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return collapsedTopMargin;
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}
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struct nsBlockHorizontalAlign {
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nscoord mXOffset; // left edge
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nscoord mLeftMargin;
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nscoord mRightMargin;
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};
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// Given the width of the block frame and a suggested x-offset calculate
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// the actual x-offset taking into account horizontal alignment. Also returns
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// the actual left and right margin
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void
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nsBlockReflowContext::AlignBlockHorizontally(nscoord aWidth,
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nsBlockHorizontalAlign &aAlign)
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{
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// Initialize OUT parameters
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aAlign.mLeftMargin = mMargin.left;
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aAlign.mRightMargin = mMargin.right;
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// Get style unit associated with the left and right margins
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nsStyleUnit leftUnit = mStyleSpacing->mMargin.GetLeftUnit();
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if (eStyleUnit_Inherit == leftUnit) {
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leftUnit = GetRealMarginLeftUnit();
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}
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nsStyleUnit rightUnit = mStyleSpacing->mMargin.GetRightUnit();
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if (eStyleUnit_Inherit == rightUnit) {
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rightUnit = GetRealMarginRightUnit();
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}
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// Apply post-reflow horizontal alignment. When a block element
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// doesn't use it all of the available width then we need to
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// align it using the text-align property.
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if (NS_UNCONSTRAINEDSIZE != mSpace.width) {
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// It is possible that the object reflowed was given a
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// constrained width and ended up picking a different width
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// (e.g. a table width a set width that ended up larger
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// because its contents required it). When this happens we
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// need to recompute auto margins because the reflow state's
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// computations are no longer valid.
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if (aWidth != mComputedWidth) {
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if (eStyleUnit_Auto == leftUnit) {
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aAlign.mXOffset = 0;
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aAlign.mLeftMargin = 0;
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}
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if (eStyleUnit_Auto == rightUnit) {
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aAlign.mRightMargin = 0;
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}
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}
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// Compute how much remaining space there is, and in special
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// cases apply it (normally we should get zero here because of
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// the logic in nsHTMLReflowState).
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nscoord remainingSpace = mSpace.XMost() - (aAlign.mXOffset + aWidth +
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aAlign.mRightMargin);
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if (remainingSpace > 0) {
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// The block/table frame didn't use all of the available
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// space. Synthesize margins for its horizontal placement.
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if (eStyleUnit_Auto == leftUnit) {
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if (eStyleUnit_Auto == rightUnit) {
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// When both margins are auto, we center the block
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aAlign.mXOffset += remainingSpace / 2;
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}
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else {
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// When the left margin is auto we right align the block
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aAlign.mXOffset += remainingSpace;
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}
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}
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else if (eStyleUnit_Auto != rightUnit) {
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// The block/table doesn't have auto margins.
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PRBool doCSS = PR_TRUE;
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if (mIsTable) {
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const nsStyleText* styleText;
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mOuterReflowState.frame->GetStyleData(eStyleStruct_Text,
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(const nsStyleStruct*&)styleText);
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// This is a navigator compatability case: tables are
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// affected by the text alignment of the containing
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// block. CSS doesn't do this, so we use special
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// text-align attribute values to signal these
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// compatability cases.
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switch (styleText->mTextAlign) {
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case NS_STYLE_TEXT_ALIGN_MOZ_RIGHT:
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case NS_STYLE_TEXT_ALIGN_RIGHT:
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aAlign.mXOffset += remainingSpace;
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doCSS = PR_FALSE;
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break;
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case NS_STYLE_TEXT_ALIGN_MOZ_CENTER:
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case NS_STYLE_TEXT_ALIGN_CENTER:
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{
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nsCompatibility mode;
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mPresContext->GetCompatibilityMode(&mode);
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if (eCompatibility_NavQuirks == mode) {
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aAlign.mXOffset += remainingSpace / 2;
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doCSS = PR_FALSE;
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}
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}
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break;
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}
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}
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if (doCSS) {
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// XXX It's not clear we can ever get here because for normal blocks,
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// their size will be well defined by the nsHTMLReflowState logic
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// (maybe width=0 cases get here?)
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// When neither margin is auto then the block is said to
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// be over constrained, Depending on the direction, choose
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// which margin to treat as auto.
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PRUint8 direction = mOuterReflowState.mStyleDisplay->mDirection;
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if (NS_STYLE_DIRECTION_RTL == direction) {
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// The left margin becomes auto
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aAlign.mXOffset += remainingSpace;
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}
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else {
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// The right margin becomes auto which is a no-op
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}
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}
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}
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}
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}
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}
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nsresult
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nsBlockReflowContext::ReflowBlock(nsIFrame* aFrame,
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const nsRect& aSpace,
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PRBool aApplyTopMargin,
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nscoord aPrevBottomMargin,
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PRBool aIsAdjacentWithTop,
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nsMargin& aComputedOffsets,
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nsReflowStatus& aFrameReflowStatus)
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{
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nsresult rv = NS_OK;
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mFrame = aFrame;
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mSpace = aSpace;
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// Get reflow reason set correctly. It's possible that a child was
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// created and then it was decided that it could not be reflowed
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// (for example, a block frame that isn't at the start of a
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// line). In this case the reason will be wrong so we need to check
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// the frame state.
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nsReflowReason reason = eReflowReason_Resize;
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nsFrameState state;
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aFrame->GetFrameState(&state);
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if (NS_FRAME_FIRST_REFLOW & state) {
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reason = eReflowReason_Initial;
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}
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else if (mNextRCFrame == aFrame) {
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reason = eReflowReason_Incremental;
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// Make sure we only incrementally reflow once
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mNextRCFrame = nsnull;
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}
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else if (mOuterReflowState.reason == eReflowReason_StyleChange) {
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reason = eReflowReason_StyleChange;
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}
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else if (mOuterReflowState.reason == eReflowReason_Dirty) {
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if (state & NS_FRAME_IS_DIRTY)
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reason = eReflowReason_Dirty;
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}
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else {
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if (mOuterReflowState.reason == eReflowReason_Incremental) {
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// If the incremental reflow command is a StyleChanged reflow
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// and it's target is the current block, then make sure we send
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// StyleChange reflow reasons down to all the children so that
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// they don't over-optimize their reflow.
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nsIReflowCommand* rc = mOuterReflowState.reflowCommand;
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if (rc) {
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nsIReflowCommand::ReflowType type;
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rc->GetType(type);
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if (type == nsIReflowCommand::StyleChanged) {
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nsIFrame* target;
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rc->GetTarget(target);
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if (target == mOuterReflowState.frame) {
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reason = eReflowReason_StyleChange;
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}
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}
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else if (type == nsIReflowCommand::ReflowDirty &&
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(state & NS_FRAME_IS_DIRTY)) {
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reason = eReflowReason_Dirty;
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}
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}
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if (eReflowReason_Resize == reason) {
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// we're doing a resize reflow, even though our outer reflow state is incremental
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// text (and possibly other objects) don't do incremental painting for resize reflows
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// so, we have to handle the invalidation for repainting ourselves
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mBlockShouldInvalidateItself = PR_TRUE;
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}
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}
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}
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// Setup reflow state for reflowing the frame
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// XXX subtract out vertical margin?
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nsSize availSpace(aSpace.width, aSpace.height);
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nsHTMLReflowState reflowState(mPresContext, mOuterReflowState, aFrame,
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availSpace, reason);
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aComputedOffsets = reflowState.mComputedOffsets;
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reflowState.mLineLayout = nsnull;
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if (!aIsAdjacentWithTop) {
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reflowState.isTopOfPage = PR_FALSE; // make sure this is cleared
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}
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mIsTable = NS_STYLE_DISPLAY_TABLE == reflowState.mStyleDisplay->mDisplay;
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mComputedWidth = reflowState.mComputedWidth;
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nscoord topMargin = 0;
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if (aApplyTopMargin) {
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// Compute the childs collapsed top margin (its margin collpased
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// with its first childs top-margin -- recursively).
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topMargin = ComputeCollapsedTopMargin(mPresContext, reflowState);
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#ifdef NOISY_VERTICAL_MARGINS
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nsFrame::ListTag(stdout, mOuterReflowState.frame);
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printf(": reflowing ");
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nsFrame::ListTag(stdout, aFrame);
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printf(" prevBottomMargin=%d, collapsedTopMargin=%d => %d\n",
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aPrevBottomMargin, topMargin,
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MaxMargin(topMargin, aPrevBottomMargin));
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#endif
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// Collapse that value with the previous bottom margin to perform
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// the sibling to sibling collaspe.
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topMargin = MaxMargin(topMargin, aPrevBottomMargin);
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// Adjust the available height if its constrained so that the
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// child frame doesn't think it can reflow into its margin area.
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if (aApplyTopMargin && (NS_UNCONSTRAINEDSIZE != reflowState.availableHeight)) {
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reflowState.availableHeight -= topMargin;
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}
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}
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mTopMargin = topMargin;
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// Compute x/y coordinate where reflow will begin. Use the rules
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// from 10.3.3 to determine what to apply. At this point in the
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// reflow auto left/right margins will have a zero value.
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mMargin = reflowState.mComputedMargin;
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mStyleSpacing = reflowState.mStyleSpacing;
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nscoord x;
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nscoord y = aSpace.y + topMargin;
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// If it's a right floated element, then calculate the x-offset
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// differently
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if (NS_STYLE_FLOAT_RIGHT == reflowState.mStyleDisplay->mFloats) {
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nscoord frameWidth;
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if (NS_UNCONSTRAINEDSIZE == reflowState.mComputedWidth) {
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nsSize frameSize;
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// Use the current frame width
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aFrame->GetSize(frameSize);
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frameWidth = frameSize.width;
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} else {
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frameWidth = reflowState.mComputedWidth +
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reflowState.mComputedBorderPadding.left +
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reflowState.mComputedBorderPadding.right;
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}
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// if this is an unconstrained width reflow, then just place the floater at the left margin
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if (NS_UNCONSTRAINEDSIZE == aSpace.width)
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x = aSpace.x;
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else
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x = aSpace.XMost() - mMargin.right - frameWidth;
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} else {
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x = aSpace.x + mMargin.left;
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}
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mX = x;
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mY = y;
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// If it's an auto-width table, then it doesn't behave like other blocks
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if (mIsTable && !reflowState.mStyleDisplay->IsFloating()) {
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// If this isn't the table's initial reflow, then use its existing
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// width to determine where it will be placed horizontally
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if (reflowState.reason != eReflowReason_Initial) {
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nsBlockHorizontalAlign align;
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nsSize size;
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aFrame->GetSize(size);
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align.mXOffset = x;
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AlignBlockHorizontally(size.width, align);
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// Don't reset "mX". because PlaceBlock() will recompute the
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// x-offset and expects "mX" to be at the left margin edge
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x = align.mXOffset;
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}
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}
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// If the element is relatively positioned, then adjust x and y accordingly
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if (NS_STYLE_POSITION_RELATIVE == reflowState.mStylePosition->mPosition) {
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x += reflowState.mComputedOffsets.left;
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y += reflowState.mComputedOffsets.top;
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}
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// Let frame know that we are reflowing it
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aFrame->WillReflow(mPresContext);
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// Position it and its view (if it has one)
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// Note: Use "x" and "y" and not "mX" and "mY" because they more accurately
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// represents where we think the block will be placed
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aFrame->MoveTo(mPresContext, x, y);
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nsIView* view;
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aFrame->GetView(mPresContext, &view);
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if (view) {
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nsContainerFrame::PositionFrameView(mPresContext, aFrame, view);
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}
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#ifdef DEBUG
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mMetrics.width = nscoord(0xdeadbeef);
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mMetrics.height = nscoord(0xdeadbeef);
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mMetrics.ascent = nscoord(0xdeadbeef);
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mMetrics.descent = nscoord(0xdeadbeef);
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if (nsnull != mMetrics.maxElementSize) {
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mMetrics.maxElementSize->width = nscoord(0xdeadbeef);
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mMetrics.maxElementSize->height = nscoord(0xdeadbeef);
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}
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#endif
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// Adjust spacemanager coordinate system for the frame. The
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// spacemanager coordinates are <b>inside</b> the callers
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// border+padding, but the x/y coordinates are not (recall that
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|
// frame coordinates are relative to the parents origin and that the
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|
// parents border/padding is <b>inside</b> the parent
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// frame. Therefore we have to subtract out the parents
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// border+padding before translating.
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nscoord tx = x - mOuterReflowState.mComputedBorderPadding.left;
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nscoord ty = y - mOuterReflowState.mComputedBorderPadding.top;
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mOuterReflowState.mSpaceManager->Translate(tx, ty);
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// See if this is the child's initial reflow and we are supposed to
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// compute our maximum width
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if (mComputeMaximumWidth && (eReflowReason_Initial == reason)) {
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nscoord oldAvailableWidth = reflowState.availableWidth;
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nscoord oldComputedWidth = reflowState.mComputedWidth;
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reflowState.availableWidth = NS_UNCONSTRAINEDSIZE;
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reflowState.mComputedWidth = NS_UNCONSTRAINEDSIZE;
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rv = aFrame->Reflow(mPresContext, mMetrics, reflowState,
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aFrameReflowStatus);
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// Update the reflow metrics with the maximum width
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mMetrics.mMaximumWidth = mMetrics.width;
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#ifdef NOISY_REFLOW
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printf("*** nsBlockReflowContext::ReflowBlock block %p returning max width %d\n",
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aFrame, mMetrics.mMaximumWidth);
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#endif
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// The second reflow is just as a resize reflow with the constrained
|
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// width
|
|
reflowState.availableWidth = oldAvailableWidth;
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reflowState.mComputedWidth = oldComputedWidth;
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reason = eReflowReason_Resize;
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}
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|
|
rv = aFrame->Reflow(mPresContext, mMetrics, reflowState,
|
|
aFrameReflowStatus);
|
|
mOuterReflowState.mSpaceManager->Translate(-tx, -ty);
|
|
|
|
#ifdef DEBUG
|
|
if (!NS_INLINE_IS_BREAK_BEFORE(aFrameReflowStatus)) {
|
|
if (CRAZY_WIDTH(mMetrics.width) || CRAZY_HEIGHT(mMetrics.height)) {
|
|
printf("nsBlockReflowContext: ");
|
|
nsFrame::ListTag(stdout, aFrame);
|
|
printf(" metrics=%d,%d!\n", mMetrics.width, mMetrics.height);
|
|
}
|
|
if ((nsnull != mMetrics.maxElementSize) &&
|
|
((nscoord(0xdeadbeef) == mMetrics.maxElementSize->width) ||
|
|
(nscoord(0xdeadbeef) == mMetrics.maxElementSize->height))) {
|
|
printf("nsBlockReflowContext: ");
|
|
nsFrame::ListTag(stdout, aFrame);
|
|
printf(" didn't set max-element-size!\n");
|
|
mMetrics.maxElementSize->width = 0;
|
|
mMetrics.maxElementSize->height = 0;
|
|
}
|
|
#ifdef REALLY_NOISY_MAX_ELEMENT_SIZE
|
|
// Note: there are common reflow situations where this *correctly*
|
|
// occurs; so only enable this debug noise when you really need to
|
|
// analyze in detail.
|
|
if ((nsnull != mMetrics.maxElementSize) &&
|
|
((mMetrics.maxElementSize->width > mMetrics.width) ||
|
|
(mMetrics.maxElementSize->height > mMetrics.height))) {
|
|
printf("nsBlockReflowContext: ");
|
|
nsFrame::ListTag(stdout, aFrame);
|
|
printf(": WARNING: maxElementSize=%d,%d > metrics=%d,%d\n",
|
|
mMetrics.maxElementSize->width,
|
|
mMetrics.maxElementSize->height,
|
|
mMetrics.width, mMetrics.height);
|
|
}
|
|
#endif
|
|
if ((mMetrics.width == nscoord(0xdeadbeef)) ||
|
|
(mMetrics.height == nscoord(0xdeadbeef)) ||
|
|
(mMetrics.ascent == nscoord(0xdeadbeef)) ||
|
|
(mMetrics.descent == nscoord(0xdeadbeef))) {
|
|
printf("nsBlockReflowContext: ");
|
|
nsFrame::ListTag(stdout, aFrame);
|
|
printf(" didn't set whad %d,%d,%d,%d!\n",
|
|
mMetrics.width, mMetrics.height,
|
|
mMetrics.ascent, mMetrics.descent);
|
|
}
|
|
}
|
|
#endif
|
|
#ifdef NOISY_MAX_ELEMENT_SIZE
|
|
if (!NS_INLINE_IS_BREAK_BEFORE(aFrameReflowStatus)) {
|
|
if (nsnull != mMetrics.maxElementSize) {
|
|
printf(" ");
|
|
nsFrame::ListTag(stdout, aFrame);
|
|
printf(": maxElementSize=%d,%d wh=%d,%d\n",
|
|
mMetrics.maxElementSize->width,
|
|
mMetrics.maxElementSize->height,
|
|
mMetrics.width, mMetrics.height);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
aFrame->GetFrameState(&state);
|
|
if (0 == (NS_FRAME_OUTSIDE_CHILDREN & state)) {
|
|
// Provide overflow area for child that doesn't have any
|
|
mMetrics.mOverflowArea.x = 0;
|
|
mMetrics.mOverflowArea.y = 0;
|
|
mMetrics.mOverflowArea.width = mMetrics.width;
|
|
mMetrics.mOverflowArea.height = mMetrics.height;
|
|
}
|
|
|
|
// Now that frame has been reflowed at least one time make sure that
|
|
// the NS_FRAME_FIRST_REFLOW bit is cleared so that never give it an
|
|
// initial reflow reason again.
|
|
if (eReflowReason_Initial == reason) {
|
|
aFrame->SetFrameState(state & ~NS_FRAME_FIRST_REFLOW);
|
|
}
|
|
|
|
if (!NS_INLINE_IS_BREAK_BEFORE(aFrameReflowStatus)) {
|
|
// If frame is complete and has a next-in-flow, we need to delete
|
|
// them now. Do not do this when a break-before is signaled because
|
|
// the frame is going to get reflowed again (and may end up wanting
|
|
// a next-in-flow where it ends up).
|
|
if (NS_FRAME_IS_COMPLETE(aFrameReflowStatus)) {
|
|
nsIFrame* kidNextInFlow;
|
|
aFrame->GetNextInFlow(&kidNextInFlow);
|
|
if (nsnull != kidNextInFlow) {
|
|
// Remove all of the childs next-in-flows. Make sure that we ask
|
|
// the right parent to do the removal (it's possible that the
|
|
// parent is not this because we are executing pullup code)
|
|
/* XXX promote DeleteChildsNextInFlow to nsIFrame to elminate this cast */
|
|
nsHTMLContainerFrame* parent;
|
|
aFrame->GetParent((nsIFrame**)&parent);
|
|
parent->DeleteChildsNextInFlow(mPresContext, aFrame);
|
|
}
|
|
}
|
|
}
|
|
|
|
// If the block is shrink wrapping its width, then see if we have percentage
|
|
// based margins. If so, we can calculate them now that we know the shrink
|
|
// wrap width
|
|
if (NS_SHRINKWRAPWIDTH == reflowState.mComputedWidth) {
|
|
nscoord boxWidth = mMetrics.width;
|
|
float leftPct = 0.0;
|
|
float rightPct = 0.0;
|
|
|
|
if (eStyleUnit_Percent == reflowState.mStyleSpacing->mMargin.GetLeftUnit()) {
|
|
nsStyleCoord leftCoord;
|
|
|
|
reflowState.mStyleSpacing->mMargin.GetLeft(leftCoord);
|
|
leftPct = leftCoord.GetPercentValue();
|
|
|
|
} else {
|
|
boxWidth += mMargin.left;
|
|
}
|
|
|
|
if (eStyleUnit_Percent == reflowState.mStyleSpacing->mMargin.GetRightUnit()) {
|
|
nsStyleCoord rightCoord;
|
|
|
|
reflowState.mStyleSpacing->mMargin.GetRight(rightCoord);
|
|
rightPct = rightCoord.GetPercentValue();
|
|
|
|
} else {
|
|
boxWidth += mMargin.right;
|
|
}
|
|
|
|
// The total shrink wrap width "sww" is calculated by the expression:
|
|
// sww = bw + (mp * sww)
|
|
// where "bw" is the box width (frame width plus margins that aren't percentage
|
|
// based) and "mp" are the total margin percentages (i.e., the left percentage
|
|
// value plus the right percentage value)
|
|
// Solving for "sww" gives us:
|
|
// sww = bw / (1 - mp)
|
|
// Note that this is only well defined for "mp" less than 100%
|
|
float marginPct = leftPct + rightPct;
|
|
if (marginPct >= 1.0) {
|
|
// Ignore the right percentage and just use the left percentage
|
|
// XXX Pay attention to direction property...
|
|
marginPct = leftPct;
|
|
rightPct = 0.0;
|
|
}
|
|
|
|
if ((marginPct > 0.0) && (marginPct < 1.0)) {
|
|
double shrinkWrapWidth = float(boxWidth) / (1.0 - marginPct);
|
|
|
|
if (eStyleUnit_Percent == reflowState.mStyleSpacing->mMargin.GetLeftUnit()) {
|
|
mMargin.left = NSToCoordFloor(shrinkWrapWidth * leftPct);
|
|
mX += mMargin.left;
|
|
}
|
|
if (eStyleUnit_Percent == reflowState.mStyleSpacing->mMargin.GetRightUnit()) {
|
|
mMargin.right = NSToCoordFloor(shrinkWrapWidth * rightPct);
|
|
}
|
|
}
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* Attempt to place the block frame within the available space. If
|
|
* it fits, apply horizontal positioning (CSS 10.3.3), collapse
|
|
* margins (CSS2 8.3.1). Also apply relative positioning.
|
|
*/
|
|
PRBool
|
|
nsBlockReflowContext::PlaceBlock(PRBool aForceFit,
|
|
const nsMargin& aComputedOffsets,
|
|
nscoord* aBottomMarginResult,
|
|
nsRect& aInFlowBounds,
|
|
nsRect& aCombinedRect)
|
|
{
|
|
// Compute collapsed bottom margin value
|
|
nscoord collapsedBottomMargin = MaxMargin(mMetrics.mCarriedOutBottomMargin,
|
|
mMargin.bottom);
|
|
*aBottomMarginResult = collapsedBottomMargin;
|
|
|
|
// See if the block will fit in the available space
|
|
PRBool fits = PR_TRUE;
|
|
nscoord x = mX;
|
|
nscoord y = mY;
|
|
// When deciding whether it's an empty paragraph we also need to take into
|
|
// account the overflow area
|
|
if ((0 == mMetrics.height) && (0 == mMetrics.mOverflowArea.height)) {
|
|
if (IsHTMLParagraph(mFrame)) {
|
|
// Special "feature" for HTML compatability - empty paragraphs
|
|
// collapse into nothingness, including their margins. Signal
|
|
// the special nature here by returning -1.
|
|
*aBottomMarginResult = -1;
|
|
#ifdef NOISY_VERTICAL_MARGINS
|
|
printf(" ");
|
|
nsFrame::ListTag(stdout, mOuterReflowState.frame);
|
|
printf(": ");
|
|
nsFrame::ListTag(stdout, mFrame);
|
|
printf(" -- zapping top & bottom margin; y=%d spaceY=%d\n",
|
|
y, mSpace.y);
|
|
#endif
|
|
}
|
|
else {
|
|
// Collapse the bottom margin with the top margin that was already
|
|
// applied.
|
|
nscoord newBottomMargin = MaxMargin(collapsedBottomMargin, mTopMargin);
|
|
*aBottomMarginResult = newBottomMargin;
|
|
#ifdef NOISY_VERTICAL_MARGINS
|
|
printf(" ");
|
|
nsFrame::ListTag(stdout, mOuterReflowState.frame);
|
|
printf(": ");
|
|
nsFrame::ListTag(stdout, mFrame);
|
|
printf(" -- collapsing top & bottom margin together; y=%d spaceY=%d\n",
|
|
y, mSpace.y);
|
|
#endif
|
|
}
|
|
|
|
#if XXX
|
|
// For empty blocks we revert the y coordinate back so that the
|
|
// top margin is no longer applied.
|
|
nsBlockFrame* bf;
|
|
nsresult rv = mFrame->QueryInterface(kBlockFrameCID, (void**)&bf);
|
|
if (NS_SUCCEEDED(rv)) {
|
|
// XXX This isn't good enough. What if the floater was placed
|
|
// downward, just below another floater?
|
|
nscoord dy = mSpace.y - mY;
|
|
bf->MoveInSpaceManager(mPresContext, mOuterReflowState.mSpaceManager,
|
|
dy);
|
|
}
|
|
#endif
|
|
y = mSpace.y;
|
|
|
|
// Empty blocks do not have anything special done to them and they
|
|
// always fit. Note: don't force the width to 0
|
|
nsRect r(x, y, mMetrics.width, 0);
|
|
|
|
// Now place the frame and complete the reflow process
|
|
nsContainerFrame::FinishReflowChild(mFrame, mPresContext, mMetrics, x, y, 0);
|
|
aInFlowBounds = r;
|
|
|
|
// Retain combined area information in case we contain a floater
|
|
// and nothing else.
|
|
aCombinedRect = mMetrics.mOverflowArea;
|
|
aCombinedRect.x += x;
|
|
aCombinedRect.y += y;
|
|
}
|
|
else {
|
|
// See if the frame fit. If its the first frame then it always
|
|
// fits.
|
|
if (aForceFit || (y + mMetrics.height <= mSpace.YMost())) {
|
|
// Calculate the actual x-offset and left and right margin
|
|
nsBlockHorizontalAlign align;
|
|
|
|
align.mXOffset = x;
|
|
AlignBlockHorizontally(mMetrics.width, align);
|
|
x = align.mXOffset;
|
|
mMargin.left = align.mLeftMargin;
|
|
mMargin.right = align.mRightMargin;
|
|
|
|
// Update the in-flow bounds rectangle
|
|
aInFlowBounds.SetRect(x, y,
|
|
mMetrics.width,
|
|
mMetrics.height);
|
|
|
|
|
|
// Apply CSS relative positioning to update x,y coordinates
|
|
const nsStylePosition* stylePos;
|
|
mFrame->GetStyleData(eStyleStruct_Position,
|
|
(const nsStyleStruct*&)stylePos);
|
|
if (NS_STYLE_POSITION_RELATIVE == stylePos->mPosition) {
|
|
x += aComputedOffsets.left;
|
|
y += aComputedOffsets.top;
|
|
}
|
|
|
|
// Compute combined-rect in callers coordinate system. The value
|
|
// returned in the reflow metrics is relative to the child
|
|
// frame.
|
|
aCombinedRect.x = mMetrics.mOverflowArea.x + x;
|
|
aCombinedRect.y = mMetrics.mOverflowArea.y + y;
|
|
aCombinedRect.width = mMetrics.mOverflowArea.width;
|
|
aCombinedRect.height = mMetrics.mOverflowArea.height;
|
|
|
|
// Now place the frame and complete the reflow process
|
|
nsContainerFrame::FinishReflowChild(mFrame, mPresContext, mMetrics, x, y, 0);
|
|
|
|
// XXX obsolete, i believe...
|
|
#if 0
|
|
// If the block frame ended up moving then we need to slide
|
|
// anything inside of it that impacts the space manager
|
|
// (otherwise the impacted space in the space manager will be
|
|
// out of sync with where the frames really are).
|
|
nscoord dx = x - mX;
|
|
nscoord dy = y - mY;
|
|
if ((0 != dx) || (0 != dy)) {
|
|
nsIHTMLReflow* htmlReflow;
|
|
nsresult rv;
|
|
rv = mFrame->QueryInterface(kIHTMLReflowIID, (void**)&htmlReflow);
|
|
if (NS_SUCCEEDED(rv)) {
|
|
// If the child has any floaters that impact the space manager,
|
|
// slide them now
|
|
htmlReflow->MoveInSpaceManager(mPresContext,
|
|
mOuterReflowState.mSpaceManager,
|
|
dx, dy);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
// Adjust the max-element-size in the metrics to take into
|
|
// account the margins around the block element. Note that we
|
|
// use the collapsed top and bottom margin values.
|
|
if (nsnull != mMetrics.maxElementSize) {
|
|
nsSize* m = mMetrics.maxElementSize;
|
|
// Do not allow auto margins to impact the max-element size
|
|
// since they are springy and don't really count!
|
|
if (eStyleUnit_Auto != mStyleSpacing->mMargin.GetLeftUnit()) {
|
|
m->width += mMargin.left;
|
|
}
|
|
if (eStyleUnit_Auto != mStyleSpacing->mMargin.GetRightUnit()) {
|
|
m->width += mMargin.right;
|
|
}
|
|
|
|
#if XXX_fix_me
|
|
// Margin height should affect the max-element height (since
|
|
// auto top/bottom margins are always zero)
|
|
m->height += mTopMargin + mBottomMargin;
|
|
#endif
|
|
}
|
|
}
|
|
else {
|
|
// Send the DidReflow() notification, but don't bother placing
|
|
// the frame
|
|
mFrame->DidReflow(mPresContext, NS_FRAME_REFLOW_FINISHED);
|
|
fits = PR_FALSE;
|
|
}
|
|
}
|
|
|
|
return fits;
|
|
}
|
|
|
|
// If we have an inherited margin its possible that its auto all the
|
|
// way up to the top of the tree. If that is the case, we need to know
|
|
// it.
|
|
nsStyleUnit
|
|
nsBlockReflowContext::GetRealMarginLeftUnit()
|
|
{
|
|
nsStyleUnit unit = eStyleUnit_Inherit;
|
|
nsIStyleContext* sc;
|
|
mFrame->GetStyleContext(&sc);
|
|
while ((nsnull != sc) && (eStyleUnit_Inherit == unit)) {
|
|
// Get parent style context
|
|
nsIStyleContext* psc;
|
|
psc = sc->GetParent();
|
|
NS_RELEASE(sc);
|
|
sc = psc;
|
|
if (nsnull != sc) {
|
|
const nsStyleSpacing* spacing = (const nsStyleSpacing*)
|
|
sc->GetStyleData(eStyleStruct_Spacing);
|
|
unit = spacing->mMargin.GetLeftUnit();
|
|
}
|
|
}
|
|
NS_IF_RELEASE(sc);
|
|
return unit;
|
|
}
|
|
|
|
// If we have an inherited margin its possible that its auto all the
|
|
// way up to the top of the tree. If that is the case, we need to know
|
|
// it.
|
|
nsStyleUnit
|
|
nsBlockReflowContext::GetRealMarginRightUnit()
|
|
{
|
|
nsStyleUnit unit = eStyleUnit_Inherit;
|
|
nsIStyleContext* sc;
|
|
mFrame->GetStyleContext(&sc);
|
|
while ((nsnull != sc) && (eStyleUnit_Inherit == unit)) {
|
|
// Get parent style context
|
|
nsIStyleContext* psc;
|
|
psc = sc->GetParent();
|
|
NS_RELEASE(sc);
|
|
sc = psc;
|
|
if (nsnull != sc) {
|
|
const nsStyleSpacing* spacing = (const nsStyleSpacing*)
|
|
sc->GetStyleData(eStyleStruct_Spacing);
|
|
unit = spacing->mMargin.GetRightUnit();
|
|
}
|
|
}
|
|
NS_IF_RELEASE(sc);
|
|
return unit;
|
|
}
|