forked from mirrors/gecko-dev
382 lines
12 KiB
C++
382 lines
12 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: 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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*
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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 "nsCOMPtr.h"
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#include "nsHTMLContainerFrame.h"
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#include "nsIPresContext.h"
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#include "nsIStyleContext.h"
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#include "nsIReflowCommand.h"
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#include "nsIContent.h"
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#include "nsLineLayout.h"
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#include "nsHTMLAtoms.h"
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#include "nsHTMLIIDs.h"
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#include "nsLayoutAtoms.h"
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#define nsFirstLetterFrameSuper nsHTMLContainerFrame
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class nsFirstLetterFrame : public nsFirstLetterFrameSuper {
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public:
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nsFirstLetterFrame();
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NS_IMETHOD Init(nsIPresContext* aPresContext,
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nsIContent* aContent,
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nsIFrame* aParent,
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nsIStyleContext* aContext,
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nsIFrame* aPrevInFlow);
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NS_IMETHOD SetInitialChildList(nsIPresContext* aPresContext,
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nsIAtom* aListName,
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nsIFrame* aChildList);
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#ifdef NS_DEBUG
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NS_IMETHOD GetFrameName(nsString& aResult) const;
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#endif
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NS_IMETHOD GetFrameType(nsIAtom** aType) const;
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NS_IMETHOD Reflow(nsIPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus);
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NS_IMETHOD CanContinueTextRun(PRBool& aContinueTextRun) const;
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NS_IMETHOD SetSelected(nsIPresContext* aPresContext, nsIDOMRange *aRange,PRBool aSelected, nsSpread aSpread);
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//override of nsFrame method
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NS_IMETHOD GetChildFrameContainingOffset(PRInt32 inContentOffset,
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PRBool inHint,
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PRInt32* outFrameContentOffset,
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nsIFrame **outChildFrame);
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protected:
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virtual PRIntn GetSkipSides() const;
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void DrainOverflowFrames(nsIPresContext* aPresContext);
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};
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nsresult
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NS_NewFirstLetterFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame)
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{
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NS_PRECONDITION(aNewFrame, "null OUT ptr");
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if (nsnull == aNewFrame) {
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return NS_ERROR_NULL_POINTER;
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}
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nsFirstLetterFrame* it = new (aPresShell) nsFirstLetterFrame;
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if (nsnull == it) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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*aNewFrame = it;
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return NS_OK;
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}
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nsFirstLetterFrame::nsFirstLetterFrame()
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{
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}
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#ifdef NS_DEBUG
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NS_IMETHODIMP
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nsFirstLetterFrame::GetFrameName(nsString& aResult) const
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{
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return MakeFrameName("Letter", aResult);
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}
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#endif
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NS_IMETHODIMP
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nsFirstLetterFrame::GetFrameType(nsIAtom** aType) const
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{
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NS_PRECONDITION(nsnull != aType, "null OUT parameter pointer");
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*aType = nsLayoutAtoms::letterFrame;
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NS_ADDREF(*aType);
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return NS_OK;
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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::Init(nsIPresContext* aPresContext,
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nsIContent* aContent,
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nsIFrame* aParent,
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nsIStyleContext* aContext,
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nsIFrame* aPrevInFlow)
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{
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nsresult rv;
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nsIStyleContext* newSC = nsnull;
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if (aPrevInFlow) {
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// Get proper style context for ourselves
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nsIStyleContext* parentStyleContext;
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parentStyleContext = aContext->GetParent();
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if (parentStyleContext) {
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nsIAtom* atom = aPrevInFlow
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? nsHTMLAtoms::mozLetterFrame
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: nsHTMLAtoms::firstLetterPseudo;
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rv = aPresContext->ResolvePseudoStyleContextFor(aContent, atom,
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parentStyleContext,
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PR_FALSE, &newSC);
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NS_RELEASE(parentStyleContext);
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if (NS_FAILED(rv)) {
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return rv;
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}
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if (nsnull != newSC) {
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if (newSC == aContext) {
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NS_RELEASE(newSC);
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}
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else {
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aContext = newSC;
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}
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}
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}
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}
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rv = nsFirstLetterFrameSuper::Init(aPresContext, aContent, aParent,
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aContext, aPrevInFlow);
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NS_IF_RELEASE(newSC);
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return rv;
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}
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NS_IMETHODIMP
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nsFirstLetterFrame::SetInitialChildList(nsIPresContext* aPresContext,
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nsIAtom* aListName,
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nsIFrame* aChildList)
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{
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mFrames.SetFrames(aChildList);
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if (aChildList) {
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aPresContext->ReParentStyleContext(aChildList, mStyleContext);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsFirstLetterFrame::SetSelected(nsIPresContext* aPresContext, nsIDOMRange *aRange,PRBool aSelected, nsSpread aSpread)
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{
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if (aSelected && ParentDisablesSelection())
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return NS_OK;
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nsIFrame *child;
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nsresult result = FirstChild(aPresContext, nsnull, &child);
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while (NS_SUCCEEDED(result) && child)
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{
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child->SetSelected(aPresContext,aRange, aSelected,aSpread);//dont worry about result. there are more frames to come
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result = child->GetNextSibling(&child);
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}
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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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PRBool 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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NS_IMETHODIMP
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nsFirstLetterFrame::Reflow(nsIPresContext* 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", aReflowState.reason);
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DISPLAY_REFLOW(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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nsIFrame* nextRCFrame = nsnull;
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if (aReflowState.reason == eReflowReason_Incremental) {
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nsIFrame* target;
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aReflowState.reflowCommand->GetTarget(target);
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if (this != target) {
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aReflowState.reflowCommand->GetNext(nextRCFrame);
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}
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}
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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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if (NS_UNCONSTRAINEDSIZE != availSize.width) {
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availSize.width -= lr;
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}
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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,
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nsnull != aMetrics.maxElementSize);
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ll.BeginLineReflow(0, 0, NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE,
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PR_FALSE, PR_TRUE);
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rs.mLineLayout = ≪
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ll.SetFirstLetterStyleOK(PR_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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}
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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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PRBool pushedFrame;
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ll->BeginSpan(this, &aReflowState, bp.left, availSize.width);
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ll->ReflowFrame(kid, &nextRCFrame, aReflowStatus, &aMetrics, pushedFrame);
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nsSize size;
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ll->EndSpan(this, size, aMetrics.maxElementSize);
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}
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// Place and size the child and update the output metrics
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kid->MoveTo(aPresContext, bp.left, bp.top);
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kid->SizeTo(aPresContext, aMetrics.width, aMetrics.height);
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kid->DidReflow(aPresContext, 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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aMetrics.descent += bp.bottom;
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if (aMetrics.maxElementSize) {
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aMetrics.maxElementSize->width += lr;
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aMetrics.maxElementSize->height += tb;
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}
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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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nsIFrame* kidNextInFlow;
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kid->GetNextInFlow(&kidNextInFlow);
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if (nsnull != kidNextInFlow) {
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// Remove all of the childs next-in-flows
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DeleteChildsNextInFlow(aPresContext, kid);
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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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nsIFrame* nextInFlow;
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rv = CreateNextInFlow(aPresContext, this, 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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if (nextInFlow) {
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kid->SetNextSibling(nsnull);
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SetOverflowFrames(aPresContext, nextInFlow);
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}
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else {
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nsIFrame* nextSib;
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kid->GetNextSibling(&nextSib);
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if (nextSib) {
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kid->SetNextSibling(nsnull);
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SetOverflowFrames(aPresContext, nextSib);
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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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NS_IMETHODIMP
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nsFirstLetterFrame::CanContinueTextRun(PRBool& aContinueTextRun) const
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{
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// We can continue a text run through a first-letter frame.
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aContinueTextRun = PR_TRUE;
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return NS_OK;
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}
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void
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nsFirstLetterFrame::DrainOverflowFrames(nsIPresContext* aPresContext)
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{
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nsIFrame* overflowFrames;
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// Check for an overflow list with our prev-in-flow
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nsFirstLetterFrame* prevInFlow = (nsFirstLetterFrame*)mPrevInFlow;
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if (nsnull != prevInFlow) {
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overflowFrames = prevInFlow->GetOverflowFrames(aPresContext, PR_TRUE);
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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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nsIFrame* f = overflowFrames;
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while (f) {
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nsHTMLContainerFrame::ReparentFrameView(aPresContext, f, prevInFlow, this);
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f->GetNextSibling(&f);
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}
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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 = GetOverflowFrames(aPresContext, PR_TRUE);
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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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nsCOMPtr<nsIStyleContext> sc;
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nsCOMPtr<nsIContent> kidContent;
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kid->GetContent(getter_AddRefs(kidContent));
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if (kidContent) {
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aPresContext->ResolveStyleContextFor(kidContent, mStyleContext,
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PR_FALSE, getter_AddRefs(sc));
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if (sc) {
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kid->SetStyleContext(aPresContext, sc);
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}
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}
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}
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}
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