зеркало из https://github.com/mozilla/pjs.git
437 строки
16 KiB
C++
437 строки
16 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* rendering object for CSS :first-letter pseudo-element */
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#include "nsCOMPtr.h"
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#include "nsFirstLetterFrame.h"
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#include "nsPresContext.h"
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#include "nsStyleContext.h"
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#include "nsIContent.h"
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#include "nsLineLayout.h"
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#include "nsGkAtoms.h"
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#include "nsAutoPtr.h"
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#include "nsStyleSet.h"
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#include "nsFrameManager.h"
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#include "nsPlaceholderFrame.h"
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#include "nsCSSFrameConstructor.h"
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using namespace::mozilla;
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nsIFrame*
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NS_NewFirstLetterFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
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return new (aPresShell) nsFirstLetterFrame(aContext);
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsFirstLetterFrame)
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NS_QUERYFRAME_HEAD(nsFirstLetterFrame)
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NS_QUERYFRAME_ENTRY(nsFirstLetterFrame)
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NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
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#ifdef NS_DEBUG
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NS_IMETHODIMP
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nsFirstLetterFrame::GetFrameName(nsAString& aResult) const
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{
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return MakeFrameName(NS_LITERAL_STRING("Letter"), aResult);
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}
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#endif
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nsIAtom*
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nsFirstLetterFrame::GetType() const
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{
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return nsGkAtoms::letterFrame;
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}
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PRIntn
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nsFirstLetterFrame::GetSkipSides() const
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{
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return 0;
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}
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NS_IMETHODIMP
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nsFirstLetterFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists)
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{
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return BuildDisplayListForInline(aBuilder, aDirtyRect, aLists);
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}
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NS_IMETHODIMP
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nsFirstLetterFrame::Init(nsIContent* aContent,
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nsIFrame* aParent,
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nsIFrame* aPrevInFlow)
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{
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nsRefPtr<nsStyleContext> newSC;
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if (aPrevInFlow) {
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// Get proper style context for ourselves. We're creating the frame
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// that represents everything *except* the first letter, so just create
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// a style context like we would for a text node.
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nsStyleContext* parentStyleContext = mStyleContext->GetParent();
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if (parentStyleContext) {
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newSC = mStyleContext->GetRuleNode()->GetPresContext()->StyleSet()->
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ResolveStyleForNonElement(parentStyleContext);
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if (newSC)
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SetStyleContextWithoutNotification(newSC);
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}
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}
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return nsContainerFrame::Init(aContent, aParent, aPrevInFlow);
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}
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NS_IMETHODIMP
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nsFirstLetterFrame::SetInitialChildList(ChildListID aListID,
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nsFrameList& aChildList)
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{
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nsFrameManager *frameManager = PresContext()->FrameManager();
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for (nsFrameList::Enumerator e(aChildList); !e.AtEnd(); e.Next()) {
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NS_ASSERTION(e.get()->GetParent() == this, "Unexpected parent");
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frameManager->ReparentStyleContext(e.get());
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}
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mFrames.SetFrames(aChildList);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsFirstLetterFrame::GetChildFrameContainingOffset(PRInt32 inContentOffset,
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bool inHint,
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PRInt32* outFrameContentOffset,
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nsIFrame **outChildFrame)
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{
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nsIFrame *kid = mFrames.FirstChild();
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if (kid)
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{
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return kid->GetChildFrameContainingOffset(inContentOffset, inHint, outFrameContentOffset, outChildFrame);
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}
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else
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return nsFrame::GetChildFrameContainingOffset(inContentOffset, inHint, outFrameContentOffset, outChildFrame);
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}
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// Needed for non-floating first-letter frames and for the continuations
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// following the first-letter that we also use nsFirstLetterFrame for.
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/* virtual */ void
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nsFirstLetterFrame::AddInlineMinWidth(nsRenderingContext *aRenderingContext,
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nsIFrame::InlineMinWidthData *aData)
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{
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DoInlineIntrinsicWidth(aRenderingContext, aData, nsLayoutUtils::MIN_WIDTH);
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}
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// Needed for non-floating first-letter frames and for the continuations
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// following the first-letter that we also use nsFirstLetterFrame for.
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/* virtual */ void
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nsFirstLetterFrame::AddInlinePrefWidth(nsRenderingContext *aRenderingContext,
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nsIFrame::InlinePrefWidthData *aData)
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{
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DoInlineIntrinsicWidth(aRenderingContext, aData, nsLayoutUtils::PREF_WIDTH);
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}
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// Needed for floating first-letter frames.
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/* virtual */ nscoord
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nsFirstLetterFrame::GetMinWidth(nsRenderingContext *aRenderingContext)
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{
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return nsLayoutUtils::MinWidthFromInline(this, aRenderingContext);
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}
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// Needed for floating first-letter frames.
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/* virtual */ nscoord
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nsFirstLetterFrame::GetPrefWidth(nsRenderingContext *aRenderingContext)
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{
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return nsLayoutUtils::PrefWidthFromInline(this, aRenderingContext);
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}
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/* virtual */ nsSize
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nsFirstLetterFrame::ComputeSize(nsRenderingContext *aRenderingContext,
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nsSize aCBSize, nscoord aAvailableWidth,
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nsSize aMargin, nsSize aBorder, nsSize aPadding,
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bool aShrinkWrap)
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{
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if (GetPrevInFlow()) {
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// We're wrapping the text *after* the first letter, so behave like an
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// inline frame.
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return nsSize(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
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}
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return nsContainerFrame::ComputeSize(aRenderingContext,
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aCBSize, aAvailableWidth, aMargin, aBorder, aPadding, aShrinkWrap);
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}
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NS_IMETHODIMP
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nsFirstLetterFrame::Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aMetrics,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aReflowStatus)
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{
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DO_GLOBAL_REFLOW_COUNT("nsFirstLetterFrame");
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DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aReflowStatus);
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nsresult rv = NS_OK;
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// Grab overflow list
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DrainOverflowFrames(aPresContext);
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nsIFrame* kid = mFrames.FirstChild();
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// Setup reflow state for our child
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nsSize availSize(aReflowState.availableWidth, aReflowState.availableHeight);
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const nsMargin& bp = aReflowState.mComputedBorderPadding;
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nscoord lr = bp.left + bp.right;
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nscoord tb = bp.top + bp.bottom;
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NS_ASSERTION(availSize.width != NS_UNCONSTRAINEDSIZE,
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"should no longer use unconstrained widths");
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availSize.width -= lr;
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if (NS_UNCONSTRAINEDSIZE != availSize.height) {
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availSize.height -= tb;
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}
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// Reflow the child
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if (!aReflowState.mLineLayout) {
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// When there is no lineLayout provided, we provide our own. The
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// only time that the first-letter-frame is not reflowing in a
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// line context is when its floating.
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nsHTMLReflowState rs(aPresContext, aReflowState, kid, availSize);
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nsLineLayout ll(aPresContext, nsnull, &aReflowState, nsnull);
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// For unicode-bidi: plaintext, we need to get the direction of the line
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// from the resolved paragraph level of the child, not the block frame,
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// because the block frame could be split by hard line breaks into
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// multiple paragraphs with different base direction
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PRUint8 direction;
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nsIFrame* containerFrame = ll.GetLineContainerFrame();
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if (containerFrame->GetStyleTextReset()->mUnicodeBidi &
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NS_STYLE_UNICODE_BIDI_PLAINTEXT) {
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FramePropertyTable *propTable = aPresContext->PropertyTable();
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direction = NS_PTR_TO_INT32(propTable->Get(kid, BaseLevelProperty())) & 1;
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} else {
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direction = containerFrame->GetStyleVisibility()->mDirection;
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}
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ll.BeginLineReflow(bp.left, bp.top, availSize.width, NS_UNCONSTRAINEDSIZE,
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false, true, direction);
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rs.mLineLayout = ≪
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ll.SetInFirstLetter(true);
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ll.SetFirstLetterStyleOK(true);
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kid->WillReflow(aPresContext);
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kid->Reflow(aPresContext, aMetrics, rs, aReflowStatus);
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ll.EndLineReflow();
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ll.SetInFirstLetter(false);
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// In the floating first-letter case, we need to set this ourselves;
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// nsLineLayout::BeginSpan will set it in the other case
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mBaseline = aMetrics.ascent;
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}
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else {
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// Pretend we are a span and reflow the child frame
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nsLineLayout* ll = aReflowState.mLineLayout;
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bool pushedFrame;
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ll->SetInFirstLetter(
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mStyleContext->GetPseudo() == nsCSSPseudoElements::firstLetter);
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ll->BeginSpan(this, &aReflowState, bp.left, availSize.width, &mBaseline);
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ll->ReflowFrame(kid, aReflowStatus, &aMetrics, pushedFrame);
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ll->EndSpan(this);
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ll->SetInFirstLetter(false);
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}
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// Place and size the child and update the output metrics
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kid->SetRect(nsRect(bp.left, bp.top, aMetrics.width, aMetrics.height));
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kid->FinishAndStoreOverflow(&aMetrics);
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kid->DidReflow(aPresContext, nsnull, NS_FRAME_REFLOW_FINISHED);
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aMetrics.width += lr;
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aMetrics.height += tb;
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aMetrics.ascent += bp.top;
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// Ensure that the overflow rect contains the child textframe's overflow rect.
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// Note that if this is floating, the overline/underline drawable area is in
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// the overflow rect of the child textframe.
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aMetrics.UnionOverflowAreasWithDesiredBounds();
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ConsiderChildOverflow(aMetrics.mOverflowAreas, kid);
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if (!NS_INLINE_IS_BREAK_BEFORE(aReflowStatus)) {
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// Create a continuation or remove existing continuations based on
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// the reflow completion status.
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if (NS_FRAME_IS_COMPLETE(aReflowStatus)) {
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if (aReflowState.mLineLayout) {
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aReflowState.mLineLayout->SetFirstLetterStyleOK(false);
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}
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nsIFrame* kidNextInFlow = kid->GetNextInFlow();
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if (kidNextInFlow) {
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// Remove all of the childs next-in-flows
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static_cast<nsContainerFrame*>(kidNextInFlow->GetParent())
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->DeleteNextInFlowChild(aPresContext, kidNextInFlow, true);
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}
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}
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else {
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// Create a continuation for the child frame if it doesn't already
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// have one.
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if (!GetStyleDisplay()->IsFloating()) {
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nsIFrame* nextInFlow;
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rv = CreateNextInFlow(aPresContext, kid, nextInFlow);
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if (NS_FAILED(rv)) {
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return rv;
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}
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// And then push it to our overflow list
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const nsFrameList& overflow = mFrames.RemoveFramesAfter(kid);
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if (overflow.NotEmpty()) {
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SetOverflowFrames(aPresContext, overflow);
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}
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} else if (!kid->GetNextInFlow()) {
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// For floating first letter frames (if a continuation wasn't already
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// created for us) we need to put the continuation with the rest of the
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// text that the first letter frame was made out of.
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nsIFrame* continuation;
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rv = CreateContinuationForFloatingParent(aPresContext, kid,
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&continuation, true);
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}
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}
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}
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FinishAndStoreOverflow(&aMetrics);
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NS_FRAME_SET_TRUNCATION(aReflowStatus, aReflowState, aMetrics);
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return rv;
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}
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/* virtual */ bool
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nsFirstLetterFrame::CanContinueTextRun() const
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{
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// We can continue a text run through a first-letter frame.
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return true;
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}
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nsresult
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nsFirstLetterFrame::CreateContinuationForFloatingParent(nsPresContext* aPresContext,
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nsIFrame* aChild,
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nsIFrame** aContinuation,
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bool aIsFluid)
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{
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NS_ASSERTION(GetStyleDisplay()->IsFloating(),
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"can only call this on floating first letter frames");
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NS_PRECONDITION(aContinuation, "bad args");
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*aContinuation = nsnull;
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nsresult rv = NS_OK;
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nsIPresShell* presShell = aPresContext->PresShell();
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nsPlaceholderFrame* placeholderFrame =
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presShell->FrameManager()->GetPlaceholderFrameFor(this);
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nsIFrame* parent = placeholderFrame->GetParent();
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nsIFrame* continuation;
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rv = presShell->FrameConstructor()->
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CreateContinuingFrame(aPresContext, aChild, parent, &continuation, aIsFluid);
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if (NS_FAILED(rv) || !continuation) {
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return rv;
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}
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// The continuation will have gotten the first letter style from it's
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// prev continuation, so we need to repair the style context so it
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// doesn't have the first letter styling.
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nsStyleContext* parentSC = this->GetStyleContext()->GetParent();
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if (parentSC) {
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nsRefPtr<nsStyleContext> newSC;
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newSC = presShell->StyleSet()->ResolveStyleForNonElement(parentSC);
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if (newSC) {
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continuation->SetStyleContext(newSC);
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}
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}
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//XXX Bidi may not be involved but we have to use the list name
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// kNoReflowPrincipalList because this is just like creating a continuation
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// except we have to insert it in a different place and we don't want a
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// reflow command to try to be issued.
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nsFrameList temp(continuation, continuation);
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rv = parent->InsertFrames(kNoReflowPrincipalList, placeholderFrame, temp);
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*aContinuation = continuation;
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return rv;
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}
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void
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nsFirstLetterFrame::DrainOverflowFrames(nsPresContext* aPresContext)
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{
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nsAutoPtr<nsFrameList> overflowFrames;
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// Check for an overflow list with our prev-in-flow
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nsFirstLetterFrame* prevInFlow = (nsFirstLetterFrame*)GetPrevInFlow();
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if (nsnull != prevInFlow) {
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overflowFrames = prevInFlow->StealOverflowFrames();
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if (overflowFrames) {
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NS_ASSERTION(mFrames.IsEmpty(), "bad overflow list");
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// When pushing and pulling frames we need to check for whether any
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// views need to be reparented.
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nsContainerFrame::ReparentFrameViewList(aPresContext, *overflowFrames,
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prevInFlow, this);
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mFrames.InsertFrames(this, nsnull, *overflowFrames);
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}
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}
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// It's also possible that we have an overflow list for ourselves
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overflowFrames = StealOverflowFrames();
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if (overflowFrames) {
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NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames");
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mFrames.AppendFrames(nsnull, *overflowFrames);
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}
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// Now repair our first frames style context (since we only reflow
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// one frame there is no point in doing any other ones until they
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// are reflowed)
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nsIFrame* kid = mFrames.FirstChild();
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if (kid) {
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nsRefPtr<nsStyleContext> sc;
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nsIContent* kidContent = kid->GetContent();
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if (kidContent) {
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NS_ASSERTION(kidContent->IsNodeOfType(nsINode::eTEXT),
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"should contain only text nodes");
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sc = aPresContext->StyleSet()->ResolveStyleForNonElement(mStyleContext);
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if (sc) {
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kid->SetStyleContext(sc);
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}
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}
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}
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}
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nscoord
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nsFirstLetterFrame::GetBaseline() const
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{
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return mBaseline;
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}
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