зеркало из https://github.com/mozilla/gecko-dev.git
617 строки
23 KiB
C++
617 строки
23 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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* the License for the specific language governing rights and limitations
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* under the License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is Netscape Communications
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* Corporation. Portions created by Netscape are Copyright (C) 1998
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* Netscape Communications Corporation. All Rights Reserved.
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*/
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#include "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 "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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: 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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{
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mStyleSpacing = nsnull;
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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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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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// 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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#ifdef NOISY_VERTICAL_MARGINS
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nsFrame::ListTag(stdout, mOuterReflowState.frame);
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printf(": prevBottomMargin=%d\n", aPrevBottomMargin);
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#endif
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topMargin = ComputeCollapsedTopMargin(mPresContext, reflowState);
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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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// XXX write me
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#if 0
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availSpace.y += topMargin;
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if (NS_UNCONSTRAINEDSIZE != availHeight) {
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availSpace.height -= topMargin;
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}
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#endif
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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 = aSpace.x + mMargin.left;
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nscoord y = aSpace.y + topMargin;
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mX = x;
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mY = y;
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// Let frame know that we are reflowing it
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nsIHTMLReflow* htmlReflow;
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rv = aFrame->QueryInterface(kIHTMLReflowIID, (void**)&htmlReflow);
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if (NS_FAILED(rv)) {
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return rv;
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}
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htmlReflow->WillReflow(*mPresContext);
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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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rv = htmlReflow->Reflow(*mPresContext, mMetrics, reflowState,
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aFrameReflowStatus);
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mOuterReflowState.mSpaceManager->Translate(-tx, -ty);
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#ifdef DEBUG
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if (!NS_INLINE_IS_BREAK_BEFORE(aFrameReflowStatus)) {
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if (CRAZY_WIDTH(mMetrics.width) || CRAZY_HEIGHT(mMetrics.height)) {
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printf("nsBlockReflowContext: ");
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nsFrame::ListTag(stdout, aFrame);
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printf(" metrics=%d,%d!\n", mMetrics.width, mMetrics.height);
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}
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if ((nsnull != mMetrics.maxElementSize) &&
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((nscoord(0xdeadbeef) == mMetrics.maxElementSize->width) ||
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(nscoord(0xdeadbeef) == mMetrics.maxElementSize->height))) {
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printf("nsBlockReflowContext: ");
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nsFrame::ListTag(stdout, aFrame);
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printf(" didn't set max-element-size!\n");
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mMetrics.maxElementSize->width = 0;
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mMetrics.maxElementSize->height = 0;
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}
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#ifdef REALLY_NOISY_MAX_ELEMENT_SIZE
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// Note: there are common reflow situations where this *correctly*
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// occurs; so only enable this debug noise when you really need to
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// analyze in detail.
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if ((nsnull != mMetrics.maxElementSize) &&
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((mMetrics.maxElementSize->width > mMetrics.width) ||
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(mMetrics.maxElementSize->height > mMetrics.height))) {
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printf("nsBlockReflowContext: ");
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nsFrame::ListTag(stdout, aFrame);
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printf(": WARNING: maxElementSize=%d,%d > metrics=%d,%d\n",
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mMetrics.maxElementSize->width,
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mMetrics.maxElementSize->height,
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mMetrics.width, mMetrics.height);
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}
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#endif
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if ((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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printf("nsBlockReflowContext: ");
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nsFrame::ListTag(stdout, aFrame);
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printf(" didn't set whad %d,%d,%d,%d!\n",
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mMetrics.width, mMetrics.height,
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mMetrics.ascent, mMetrics.descent);
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}
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}
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#endif
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#ifdef NOISY_MAX_ELEMENT_SIZE
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if (!NS_INLINE_IS_BREAK_BEFORE(aFrameReflowStatus)) {
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if (nsnull != mMetrics.maxElementSize) {
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printf(" ");
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nsFrame::ListTag(stdout, aFrame);
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printf(": maxElementSize=%d,%d wh=%d,%d\n",
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mMetrics.maxElementSize->width,
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mMetrics.maxElementSize->height,
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mMetrics.width, mMetrics.height);
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}
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}
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#endif
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aFrame->GetFrameState(&state);
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if (0 == (NS_FRAME_OUTSIDE_CHILDREN & state)) {
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// Provide combined area for child that doesn't have any
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mMetrics.mCombinedArea.x = 0;
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mMetrics.mCombinedArea.y = 0;
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mMetrics.mCombinedArea.width = mMetrics.width;
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mMetrics.mCombinedArea.height = mMetrics.height;
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}
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// Now that frame has been reflowed at least one time make sure that
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// the NS_FRAME_FIRST_REFLOW bit is cleared so that never give it an
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// initial reflow reason again.
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if (eReflowReason_Initial == reason) {
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aFrame->SetFrameState(state & ~NS_FRAME_FIRST_REFLOW);
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}
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if (!NS_INLINE_IS_BREAK_BEFORE(aFrameReflowStatus)) {
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// If frame is complete and has a next-in-flow, we need to delete
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// them now. Do not do this when a break-before is signaled because
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// the frame is going to get reflowed again (and may end up wanting
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// a next-in-flow where it ends up).
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if (NS_FRAME_IS_COMPLETE(aFrameReflowStatus)) {
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nsIFrame* kidNextInFlow;
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aFrame->GetNextInFlow(&kidNextInFlow);
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if (nsnull != kidNextInFlow) {
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// Remove all of the childs next-in-flows. Make sure that we ask
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// the right parent to do the removal (it's possible that the
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// parent is not this because we are executing pullup code)
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/* XXX promote DeleteChildsNextInFlow to nsIFrame to elminate this cast */
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nsHTMLContainerFrame* parent;
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aFrame->GetParent((nsIFrame**)&parent);
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parent->DeleteChildsNextInFlow(*mPresContext, aFrame);
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}
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}
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}
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return rv;
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}
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/**
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* Attempt to place the block frame within the available space. If
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* it fits, apply horizontal positioning (CSS 10.3.3), collapse
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* margins (CSS2 8.3.1). Also apply relative positioning.
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*/
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PRBool
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nsBlockReflowContext::PlaceBlock(PRBool aForceFit,
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const nsMargin& aComputedOffsets,
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nscoord* aBottomMarginResult,
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nsRect& aInFlowBounds,
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nsRect& aCombinedRect)
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{
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// Compute collapsed bottom margin value
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nscoord collapsedBottomMargin = MaxMargin(mMetrics.mCarriedOutBottomMargin,
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mMargin.bottom);
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*aBottomMarginResult = collapsedBottomMargin;
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// See if the block will fit in the available space
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PRBool fits = PR_TRUE;
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nscoord x = mX;
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nscoord y = mY;
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// When deciding whether it's an empty paragraph we also need to take into
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// account the combined area
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if ((0 == mMetrics.height) && (0 == mMetrics.mCombinedArea.height)) {
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if (IsHTMLParagraph(mFrame)) {
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// Special "feature" for HTML compatability - empty paragraphs
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// collapse into nothingness, including their margins.
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*aBottomMarginResult = 0;
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#ifdef NOISY_VERTICAL_MARGINS
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printf(" ");
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nsFrame::ListTag(stdout, mOuterReflowState.frame);
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printf(": ");
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nsFrame::ListTag(stdout, mFrame);
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printf(" -- zapping top & bottom margin; y=%d spaceY=%d\n",
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y, mSpace.y);
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#endif
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}
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else {
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// Collapse the bottom margin with the top margin that was already
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// applied.
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nscoord newBottomMargin = MaxMargin(collapsedBottomMargin, mTopMargin);
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*aBottomMarginResult = newBottomMargin;
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#ifdef NOISY_VERTICAL_MARGINS
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printf(" ");
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nsFrame::ListTag(stdout, mOuterReflowState.frame);
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printf(": ");
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nsFrame::ListTag(stdout, mFrame);
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printf(" -- collapsing top & bottom margin together; y=%d spaceY=%d\n",
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y, mSpace.y);
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#endif
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}
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// For empty blocks we revert the y coordinate back so that the
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// top margin is no longer applied.
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nsIHTMLReflow* htmlReflow;
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nsresult rv = mFrame->QueryInterface(kIHTMLReflowIID, (void**)&htmlReflow);
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if (NS_SUCCEEDED(rv)) {
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// XXX This isn't good enough. What if the floater was placed
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// downward, just below another floater?
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nscoord dy = mSpace.y - mY;
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htmlReflow->MoveInSpaceManager(mPresContext,
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mOuterReflowState.mSpaceManager, 0, dy);
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}
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y = mSpace.y;
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// Empty blocks do not have anything special done to them and they
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// always fit. Note: don't force the width to 0
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nsRect r(x, y, mMetrics.width, 0);
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mFrame->SetRect(r);
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aInFlowBounds = r;
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// Retain combined area information in case we contain a floater
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// and nothing else.
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aCombinedRect = mMetrics.mCombinedArea;
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aCombinedRect.x += x;
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aCombinedRect.y += y;
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}
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else {
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// See if the frame fit. If its the first frame then it always
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// fits.
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if (aForceFit || (y + mMetrics.height <= mSpace.YMost())) {
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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 (mMetrics.width != mComputedWidth) {
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if (eStyleUnit_Auto == leftUnit) {
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x = 0;
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mMargin.left = 0;
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}
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if (eStyleUnit_Auto == rightUnit) {
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mMargin.right = 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() -
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(x + mMetrics.width + mMargin.right);
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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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x += 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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x += 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;
|
|
if (mIsTable) {
|
|
const nsStyleText* styleText;
|
|
mOuterReflowState.frame->GetStyleData(eStyleStruct_Text,
|
|
(const nsStyleStruct*&)styleText);
|
|
// This is a navigator compatability case: tables are
|
|
// affected by the text alignment of the containing
|
|
// block. CSS doesn't do this, so we use special
|
|
// text-align attribute values to signal these
|
|
// compatability cases.
|
|
switch (styleText->mTextAlign) {
|
|
case NS_STYLE_TEXT_ALIGN_MOZ_RIGHT:
|
|
x += remainingSpace;
|
|
doCSS = PR_FALSE;
|
|
break;
|
|
case NS_STYLE_TEXT_ALIGN_MOZ_CENTER:
|
|
x += remainingSpace / 2;
|
|
doCSS = PR_FALSE;
|
|
break;
|
|
}
|
|
}
|
|
if (doCSS) {
|
|
// XXX It's not clear we can ever get here because for normal blocks,
|
|
// their size will be well defined by the nsHTMLReflowState logic
|
|
// (maybe width=0 cases get here?)
|
|
// When neither margin is auto then the block is said to
|
|
// be over constrained, Depending on the direction, choose
|
|
// which margin to treat as auto.
|
|
PRUint8 direction = mOuterReflowState.mStyleDisplay->mDirection;
|
|
if (NS_STYLE_DIRECTION_RTL == direction) {
|
|
// The left margin becomes auto
|
|
x += remainingSpace;
|
|
}
|
|
else {
|
|
// The right margin becomes auto which is a no-op
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Update the in-flow bounding box's bounds. Include the margins.
|
|
aInFlowBounds.SetRect(x, y,
|
|
mMetrics.width + mMargin.right,
|
|
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.mCombinedArea.x + x;
|
|
aCombinedRect.y = mMetrics.mCombinedArea.y + y;
|
|
aCombinedRect.width = mMetrics.mCombinedArea.width;
|
|
aCombinedRect.height = mMetrics.mCombinedArea.height;
|
|
|
|
// Now place the frame
|
|
mFrame->SetRect(nsRect(x, y, mMetrics.width, mMetrics.height));
|
|
|
|
// 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);
|
|
}
|
|
}
|
|
|
|
// 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 != leftUnit) {
|
|
m->width += mMargin.left;
|
|
}
|
|
if (eStyleUnit_Auto != rightUnit) {
|
|
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 {
|
|
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;
|
|
}
|