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794 lines
30 KiB
C++
794 lines
30 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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// vim:cindent:ts=2:et:sw=2:
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: NPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.1 (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" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* David Baron <dbaron@dbaron.org>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the NPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the NPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsBlockReflowContext.h"
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#include "nsLineLayout.h"
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#include "nsSpaceManager.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 "nsStyleContext.h"
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#include "nsHTMLReflowCommand.h"
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#include "nsHTMLContainerFrame.h"
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#include "nsBlockFrame.h"
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#include "nsLineBox.h"
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#include "nsIDOMHTMLTableCellElement.h"
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#include "nsIDOMHTMLBodyElement.h"
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#include "nsLayoutAtoms.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 aComputeMaxElementWidth,
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PRBool aComputeMaximumWidth)
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: mPresContext(aPresContext),
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mOuterReflowState(aParentRS),
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mMetrics(aComputeMaxElementWidth),
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mIsTable(PR_FALSE),
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mComputeMaximumWidth(aComputeMaximumWidth)
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{
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mStyleBorder = nsnull;
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mStyleMargin = nsnull;
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mStylePadding = 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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void
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nsBlockReflowContext::ComputeCollapsedTopMargin(nsIPresContext* aPresContext,
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nsHTMLReflowState& aRS,
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/* inout */ nsCollapsingMargin& aMargin)
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{
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// Get aFrame's top margin
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aMargin.Include(aRS.mComputedMargin.top);
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// The inclusion of the bottom margin when empty is done by the caller
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// since it doesn't need to be done by the top-level (non-recursive)
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// caller.
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#ifdef NOISY_VERTICAL_MARGINS
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nsFrame::ListTag(stdout, aRS.frame);
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printf(": %d => %d\n", aRS.mComputedMargin.top, aMargin.get());
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#endif
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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. It is also skipped if the frame is a margin root for other
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// reasons.
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if (0 == aRS.mComputedBorderPadding.top &&
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!(aRS.frame->GetStateBits() & NS_BLOCK_MARGIN_ROOT)) {
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nsBlockFrame* bf;
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if (NS_SUCCEEDED(aRS.frame->QueryInterface(kBlockFrameCID,
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NS_REINTERPRET_CAST(void**, &bf)))) {
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for (nsBlockFrame::line_iterator line = bf->begin_lines(),
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line_end = bf->end_lines();
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line != line_end; ++line) {
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PRBool isEmpty = line->IsEmpty();
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if (line->IsBlock()) {
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// Here is where we recur. 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. Since the reflow reason is irrelevant, we'll
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// arbitrarily make it a `resize' to avoid the path-plucking
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// behavior if we're in an incremental reflow.
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nsSize availSpace(aRS.mComputedWidth, aRS.mComputedHeight);
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nsHTMLReflowState reflowState(aPresContext, aRS, line->mFirstChild,
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availSpace, eReflowReason_Resize);
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ComputeCollapsedTopMargin(aPresContext, reflowState, aMargin);
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if (isEmpty)
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aMargin.Include(reflowState.mComputedMargin.bottom);
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}
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if (!isEmpty)
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break;
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}
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}
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}
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#ifdef NOISY_VERTICAL_MARGINS
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nsFrame::ListTag(stdout, aRS.frame);
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printf(": => %d\n", aMargin.get());
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#endif
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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 = mStyleMargin->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 = mStyleMargin->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 = mSpace.x;
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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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// For normal (non-table) blocks we don't get here because
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// nsHTMLReflowState::CalculateBlockSideMargins handles this.
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// (I think there may be an exception to that, though...)
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// We use a special value of the text-align property for
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// HTML alignment (the CENTER element and DIV ALIGN=...)
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// since it acts on blocks and tables rather than just
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// being a text-align.
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// So, check the text-align value from the parent to see if
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// it has one of these special values.
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const nsStyleText* styleText = mOuterReflowState.mStyleText;
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if (styleText->mTextAlign == NS_STYLE_TEXT_ALIGN_MOZ_RIGHT) {
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aAlign.mXOffset += remainingSpace;
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} else if (styleText->mTextAlign == NS_STYLE_TEXT_ALIGN_MOZ_CENTER) {
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aAlign.mXOffset += remainingSpace / 2;
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} else {
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// If we don't have a special text-align value indicating
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// HTML alignment, then use the CSS rules.
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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.mStyleVisibility->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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static void
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ComputeShrinkwrapMargins(const nsStyleMargin* aStyleMargin, nscoord aWidth, nsMargin& aMargin, nscoord& aXToUpdate) {
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nscoord boxWidth = aWidth;
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float leftPct = 0.0;
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float rightPct = 0.0;
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if (eStyleUnit_Percent == aStyleMargin->mMargin.GetLeftUnit()) {
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nsStyleCoord leftCoord;
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aStyleMargin->mMargin.GetLeft(leftCoord);
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leftPct = leftCoord.GetPercentValue();
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} else {
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boxWidth += aMargin.left;
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}
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if (eStyleUnit_Percent == aStyleMargin->mMargin.GetRightUnit()) {
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nsStyleCoord rightCoord;
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aStyleMargin->mMargin.GetRight(rightCoord);
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rightPct = rightCoord.GetPercentValue();
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} else {
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boxWidth += aMargin.right;
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}
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// The total shrink wrap width "sww" is calculated by the expression:
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// sww = bw + (mp * sww)
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// where "bw" is the box width (frame width plus margins that aren't percentage
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// based) and "mp" are the total margin percentages (i.e., the left percentage
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// value plus the right percentage value)
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// Solving for "sww" gives us:
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// sww = bw / (1 - mp)
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// Note that this is only well defined for "mp" less than 100%
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// XXXldb Um... percentage margins are based on the containing block width.
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float marginPct = leftPct + rightPct;
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if (marginPct >= 1.0) {
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// Ignore the right percentage and just use the left percentage
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// XXX Pay attention to direction property...
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marginPct = leftPct;
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rightPct = 0.0;
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}
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if ((marginPct > 0.0) && (marginPct < 1.0)) {
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double shrinkWrapWidth = float(boxWidth) / (1.0 - marginPct);
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if (eStyleUnit_Percent == aStyleMargin->mMargin.GetLeftUnit()) {
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aMargin.left = NSToCoordFloor((float)(shrinkWrapWidth * leftPct));
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aXToUpdate += aMargin.left;
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}
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if (eStyleUnit_Percent == aStyleMargin->mMargin.GetRightUnit()) {
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aMargin.right = NSToCoordFloor((float)(shrinkWrapWidth * rightPct));
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}
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}
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}
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nsresult
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nsBlockReflowContext::ReflowBlock(const nsRect& aSpace,
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PRBool aApplyTopMargin,
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nsCollapsingMargin& aPrevBottomMargin,
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PRBool aIsAdjacentWithTop,
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nsMargin& aComputedOffsets,
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nsHTMLReflowState& aFrameRS,
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nsReflowStatus& aFrameReflowStatus)
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{
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nsresult rv = NS_OK;
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mFrame = aFrameRS.frame;
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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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aFrameRS.reason = eReflowReason_Resize;
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if (NS_FRAME_FIRST_REFLOW & mFrame->GetStateBits()) {
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aFrameRS.reason = eReflowReason_Initial;
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}
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else if (mOuterReflowState.reason == eReflowReason_Incremental) {
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// If the frame we're about to reflow is on the reflow path, then
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// propagate the reflow as `incremental' so it unwinds correctly
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// to the target frames below us.
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PRBool frameIsOnReflowPath = mOuterReflowState.path->HasChild(mFrame);
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if (frameIsOnReflowPath)
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aFrameRS.reason = eReflowReason_Incremental;
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// But...if the incremental reflow command is a StyleChanged
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// reflow and its target is the current block, change the reason
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// to `style change', so that it propagates through the entire
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// subtree.
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nsHTMLReflowCommand* rc = mOuterReflowState.path->mReflowCommand;
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if (rc) {
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nsReflowType type;
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rc->GetType(type);
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if (type == eReflowType_StyleChanged)
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aFrameRS.reason = eReflowReason_StyleChange;
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else if (type == eReflowType_ReflowDirty &&
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(mFrame->GetStateBits() & NS_FRAME_IS_DIRTY) &&
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!frameIsOnReflowPath) {
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aFrameRS.reason = eReflowReason_Dirty;
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}
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}
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}
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else if (mOuterReflowState.reason == eReflowReason_StyleChange) {
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aFrameRS.reason = eReflowReason_StyleChange;
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}
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else if (mOuterReflowState.reason == eReflowReason_Dirty) {
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if (mFrame->GetStateBits() & NS_FRAME_IS_DIRTY)
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aFrameRS.reason = eReflowReason_Dirty;
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}
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/* We build a different reflow context based on the width attribute of the block,
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* if it's a float.
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* Auto-width floats need to have their containing-block size set explicitly,
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* factoring in other floats that impact it.
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* It's possible this should be quirks-only.
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* All other blocks proceed normally.
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*/
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// XXXldb We should really fix this in nsHTMLReflowState::InitConstraints instead.
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const nsStylePosition* position = mFrame->GetStylePosition();
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nsStyleUnit widthUnit = position->mWidth.GetUnit();
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const nsStyleDisplay* display = mFrame->GetStyleDisplay();
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if ((eStyleUnit_Auto == widthUnit) &&
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((NS_STYLE_FLOAT_LEFT == display->mFloats) ||
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(NS_STYLE_FLOAT_RIGHT == display->mFloats))) {
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// Initialize the reflow state and constrain the containing block's
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// width and height to the available width and height.
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aFrameRS.Init(mPresContext, mSpace.width, mSpace.height);
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}
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else {
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// Initialize the reflow state and use the containing block's computed
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// width and height (or derive appropriate values for an
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// absolutely positioned frame).
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aFrameRS.Init(mPresContext);
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}
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aComputedOffsets = aFrameRS.mComputedOffsets;
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aFrameRS.mLineLayout = nsnull;
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if (!aIsAdjacentWithTop) {
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aFrameRS.mFlags.mIsTopOfPage = PR_FALSE; // make sure this is cleared
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}
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mIsTable = NS_STYLE_DISPLAY_TABLE == aFrameRS.mStyleDisplay->mDisplay;
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mComputedWidth = aFrameRS.mComputedWidth;
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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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ComputeCollapsedTopMargin(mPresContext, aFrameRS, aPrevBottomMargin);
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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, mFrame);
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printf(" margin => %d\n", aPrevBottomMargin.get());
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#endif
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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 (NS_UNCONSTRAINEDSIZE != aFrameRS.availableHeight) {
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aFrameRS.availableHeight -= aPrevBottomMargin.get();
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}
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mTopMargin = aPrevBottomMargin;
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}
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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 = aFrameRS.mComputedMargin;
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mStyleBorder = aFrameRS.mStyleBorder;
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mStyleMargin = aFrameRS.mStyleMargin;
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mStylePadding = aFrameRS.mStylePadding;
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nscoord x;
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nscoord y = mSpace.y + mTopMargin.get();
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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 == aFrameRS.mStyleDisplay->mFloats) {
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nscoord frameWidth;
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if (NS_UNCONSTRAINEDSIZE == aFrameRS.mComputedWidth) {
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// Use the current frame width
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frameWidth = mFrame->GetSize().width;
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} else {
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frameWidth = aFrameRS.mComputedWidth +
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aFrameRS.mComputedBorderPadding.left +
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aFrameRS.mComputedBorderPadding.right;
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}
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// if this is an unconstrained width reflow, then just place the float at the left margin
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if (NS_UNCONSTRAINEDSIZE == mSpace.width)
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x = mSpace.x;
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else
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x = mSpace.XMost() - mMargin.right - frameWidth;
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} else {
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x = mSpace.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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// XXX why not for a floating table too?
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if (mIsTable && !aFrameRS.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 (aFrameRS.reason != eReflowReason_Initial) {
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nsBlockHorizontalAlign align;
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align.mXOffset = x;
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AlignBlockHorizontally(mFrame->GetSize().width, align);
|
|
// Don't reset "mX". because PlaceBlock() will recompute the
|
|
// x-offset and expects "mX" to be at the left margin edge
|
|
x = align.mXOffset;
|
|
}
|
|
}
|
|
|
|
// If the element is relatively positioned, then adjust x and y accordingly
|
|
if (NS_STYLE_POSITION_RELATIVE == aFrameRS.mStyleDisplay->mPosition) {
|
|
x += aFrameRS.mComputedOffsets.left;
|
|
y += aFrameRS.mComputedOffsets.top;
|
|
}
|
|
|
|
// Let frame know that we are reflowing it
|
|
mFrame->WillReflow(mPresContext);
|
|
|
|
// Position it and its view (if it has one)
|
|
// Note: Use "x" and "y" and not "mX" and "mY" because they more accurately
|
|
// represents where we think the block will be placed
|
|
mFrame->SetPosition(nsPoint(x, y));
|
|
nsContainerFrame::PositionFrameView(mPresContext, mFrame);
|
|
|
|
#ifdef DEBUG
|
|
mMetrics.width = nscoord(0xdeadbeef);
|
|
mMetrics.height = nscoord(0xdeadbeef);
|
|
mMetrics.ascent = nscoord(0xdeadbeef);
|
|
mMetrics.descent = nscoord(0xdeadbeef);
|
|
if (mMetrics.mComputeMEW) {
|
|
mMetrics.mMaxElementWidth = nscoord(0xdeadbeef);
|
|
}
|
|
#endif
|
|
|
|
// Adjust spacemanager coordinate system for the frame. The
|
|
// spacemanager coordinates are <b>inside</b> the callers
|
|
// border+padding, but the x/y coordinates are not (recall that
|
|
// frame coordinates are relative to the parents origin and that the
|
|
// parents border/padding is <b>inside</b> the parent
|
|
// frame. Therefore we have to subtract out the parents
|
|
// border+padding before translating.
|
|
nscoord tx = x - mOuterReflowState.mComputedBorderPadding.left;
|
|
nscoord ty = y - mOuterReflowState.mComputedBorderPadding.top;
|
|
mOuterReflowState.mSpaceManager->Translate(tx, ty);
|
|
|
|
// See if this is the child's initial reflow and we are supposed to
|
|
// compute our maximum width
|
|
if (mComputeMaximumWidth && (eReflowReason_Initial == aFrameRS.reason)) {
|
|
mOuterReflowState.mSpaceManager->PushState();
|
|
|
|
nscoord oldAvailableWidth = aFrameRS.availableWidth;
|
|
nscoord oldComputedWidth = aFrameRS.mComputedWidth;
|
|
|
|
aFrameRS.availableWidth = NS_UNCONSTRAINEDSIZE;
|
|
aFrameRS.mComputedWidth = NS_UNCONSTRAINEDSIZE;
|
|
rv = mFrame->Reflow(mPresContext, mMetrics, aFrameRS, aFrameReflowStatus);
|
|
|
|
// Update the reflow metrics with the maximum width
|
|
mMetrics.mMaximumWidth = mMetrics.width;
|
|
#ifdef NOISY_REFLOW
|
|
printf("*** nsBlockReflowContext::ReflowBlock block %p returning max width %d\n",
|
|
mFrame, mMetrics.mMaximumWidth);
|
|
#endif
|
|
// The second reflow is just as a resize reflow with the constrained
|
|
// width
|
|
aFrameRS.availableWidth = oldAvailableWidth;
|
|
aFrameRS.mComputedWidth = oldComputedWidth;
|
|
aFrameRS.reason = eReflowReason_Resize;
|
|
|
|
mOuterReflowState.mSpaceManager->PopState();
|
|
}
|
|
|
|
rv = mFrame->Reflow(mPresContext, mMetrics, aFrameRS, 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, mFrame);
|
|
printf(" metrics=%d,%d!\n", mMetrics.width, mMetrics.height);
|
|
}
|
|
if (mMetrics.mComputeMEW &&
|
|
(nscoord(0xdeadbeef) == mMetrics.mMaxElementWidth)) {
|
|
printf("nsBlockReflowContext: ");
|
|
nsFrame::ListTag(stdout, mFrame);
|
|
printf(" didn't set max-element-size!\n");
|
|
}
|
|
#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 (mMetrics.mComputeMEW &&
|
|
(mMetrics.mMaxElementWidth > mMetrics.width)) {
|
|
printf("nsBlockReflowContext: ");
|
|
nsFrame::ListTag(stdout, mFrame);
|
|
printf(": WARNING: maxElementWidth=%d > metrics=%d\n",
|
|
mMetrics.mMaxElementWidth, mMetrics.width);
|
|
}
|
|
#endif
|
|
if ((mMetrics.width == nscoord(0xdeadbeef)) ||
|
|
(mMetrics.height == nscoord(0xdeadbeef)) ||
|
|
(mMetrics.ascent == nscoord(0xdeadbeef)) ||
|
|
(mMetrics.descent == nscoord(0xdeadbeef))) {
|
|
printf("nsBlockReflowContext: ");
|
|
nsFrame::ListTag(stdout, mFrame);
|
|
printf(" didn't set whad %d,%d,%d,%d!\n",
|
|
mMetrics.width, mMetrics.height,
|
|
mMetrics.ascent, mMetrics.descent);
|
|
}
|
|
}
|
|
#endif
|
|
#ifdef DEBUG
|
|
if (nsBlockFrame::gNoisyMaxElementWidth) {
|
|
nsFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent);
|
|
if (!NS_INLINE_IS_BREAK_BEFORE(aFrameReflowStatus)) {
|
|
if (mMetrics.mComputeMEW) {
|
|
printf(" ");
|
|
nsFrame::ListTag(stdout, mFrame);
|
|
printf(": maxElementSize=%d wh=%d,%d\n",
|
|
mMetrics.mMaxElementWidth,
|
|
mMetrics.width, mMetrics.height);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (!(NS_FRAME_OUTSIDE_CHILDREN & mFrame->GetStateBits())) {
|
|
// 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 == aFrameRS.reason) {
|
|
mFrame->RemoveStateBits(NS_FRAME_FIRST_REFLOW);
|
|
}
|
|
|
|
if (!NS_INLINE_IS_BREAK_BEFORE(aFrameReflowStatus) ||
|
|
(mFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW)) {
|
|
// 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), unless it is an out of flow frame.
|
|
if (NS_FRAME_IS_COMPLETE(aFrameReflowStatus)) {
|
|
nsIFrame* kidNextInFlow;
|
|
mFrame->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 */
|
|
NS_STATIC_CAST(nsHTMLContainerFrame*, kidNextInFlow->GetParent())
|
|
->DeleteNextInFlowChild(mPresContext, kidNextInFlow);
|
|
}
|
|
}
|
|
}
|
|
|
|
// 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 == aFrameRS.mComputedWidth) {
|
|
ComputeShrinkwrapMargins(aFrameRS.mStyleMargin, mMetrics.width, mMargin, mX);
|
|
}
|
|
|
|
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(const nsHTMLReflowState& aReflowState,
|
|
PRBool aForceFit,
|
|
const nsMargin& aComputedOffsets,
|
|
nsCollapsingMargin& aBottomMarginResult,
|
|
nsRect& aInFlowBounds,
|
|
nsRect& aCombinedRect)
|
|
{
|
|
// Compute collapsed bottom margin value
|
|
aBottomMarginResult = mMetrics.mCarriedOutBottomMargin;
|
|
aBottomMarginResult.Include(mMargin.bottom);
|
|
|
|
// 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 empty we also need to take into
|
|
// account the overflow area
|
|
|
|
// XXXldb What should really matter is whether there exist non-
|
|
// empty frames in the block (with appropriate whitespace munging).
|
|
// Consider the case where we clip off the overflow with
|
|
// 'overflow: -moz-hidden-unscrollable' (which doesn't currently
|
|
// affect mOverflowArea, but probably should.
|
|
if ((0 == mMetrics.height) && (0 == mMetrics.mOverflowArea.height))
|
|
{
|
|
// Collapse the bottom margin with the top margin that was already
|
|
// applied.
|
|
aBottomMarginResult.Include(mTopMargin);
|
|
#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
|
|
|
|
y = mSpace.y;
|
|
|
|
// Now place the frame and complete the reflow process
|
|
nsContainerFrame::FinishReflowChild(mFrame, mPresContext, &aReflowState, mMetrics, x, y, 0);
|
|
|
|
// Empty blocks do not have anything special done to them and they
|
|
// always fit. Note: don't force the width to 0
|
|
aInFlowBounds = nsRect(x, y, mMetrics.width, 0);
|
|
|
|
// Retain combined area information in case we contain a float
|
|
// 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 nsStyleDisplay* styleDisp = mFrame->GetStyleDisplay();
|
|
if (NS_STYLE_POSITION_RELATIVE == styleDisp->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. This includes relative positioning and the result should
|
|
// be used only for painting and for 'overflow' handling.
|
|
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, &aReflowState, mMetrics, x, y, 0);
|
|
|
|
// 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 (mMetrics.mComputeMEW) {
|
|
nsMargin maxElemMargin = mMargin;
|
|
|
|
if (NS_SHRINKWRAPWIDTH == mComputedWidth) {
|
|
nscoord dummyXOffset;
|
|
// Base the margins on the max-element size
|
|
ComputeShrinkwrapMargins(mStyleMargin, mMetrics.mMaxElementWidth,
|
|
maxElemMargin, dummyXOffset);
|
|
}
|
|
|
|
// Do not allow auto margins to impact the max-element size
|
|
// since they are springy and don't really count!
|
|
if ((eStyleUnit_Auto != mStyleMargin->mMargin.GetLeftUnit()) &&
|
|
(eStyleUnit_Null != mStyleMargin->mMargin.GetLeftUnit())) {
|
|
mMetrics.mMaxElementWidth += maxElemMargin.left;
|
|
}
|
|
if ((eStyleUnit_Auto != mStyleMargin->mMargin.GetRightUnit()) &&
|
|
(eStyleUnit_Null != mStyleMargin->mMargin.GetRightUnit())) {
|
|
mMetrics.mMaxElementWidth += maxElemMargin.right;
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
// Send the DidReflow() notification, but don't bother placing
|
|
// the frame
|
|
mFrame->DidReflow(mPresContext, &aReflowState, 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;
|
|
nsStyleContext* sc = mFrame->GetStyleContext();
|
|
while (sc && eStyleUnit_Inherit == unit) {
|
|
// Get parent style context
|
|
sc = sc->GetParent();
|
|
if (sc) {
|
|
const nsStyleMargin* margin = sc->GetStyleMargin();
|
|
unit = margin->mMargin.GetLeftUnit();
|
|
}
|
|
}
|
|
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;
|
|
nsStyleContext* sc = mFrame->GetStyleContext();
|
|
while (sc && eStyleUnit_Inherit == unit) {
|
|
// Get parent style context
|
|
sc = sc->GetParent();
|
|
if (sc) {
|
|
const nsStyleMargin* margin = sc->GetStyleMargin();
|
|
unit = margin->mMargin.GetRightUnit();
|
|
}
|
|
}
|
|
return unit;
|
|
}
|