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289 lines
10 KiB
C++
289 lines
10 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.org 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 HTML <br> elements */
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#include "nsCOMPtr.h"
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#include "nsFrame.h"
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#include "nsHTMLParts.h"
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#include "nsPresContext.h"
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#include "nsLineLayout.h"
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#include "nsStyleConsts.h"
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#include "nsGkAtoms.h"
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#include "nsIFontMetrics.h"
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#include "nsIRenderingContext.h"
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#include "nsLayoutUtils.h"
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#ifdef ACCESSIBILITY
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#include "nsIServiceManager.h"
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#include "nsIAccessible.h"
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#include "nsIAccessibilityService.h"
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#endif
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//FOR SELECTION
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#include "nsIContent.h"
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#include "nsFrameSelection.h"
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//END INCLUDES FOR SELECTION
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class BRFrame : public nsFrame {
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public:
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friend nsIFrame* NS_NewBRFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
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virtual ContentOffsets CalcContentOffsetsFromFramePoint(nsPoint aPoint);
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virtual PRBool PeekOffsetNoAmount(PRBool aForward, PRInt32* aOffset);
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virtual PRBool PeekOffsetCharacter(PRBool aForward, PRInt32* aOffset);
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virtual PRBool PeekOffsetWord(PRBool aForward, PRBool aWordSelectEatSpace, PRBool aIsKeyboardSelect,
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PRInt32* aOffset, PeekWordState* aState);
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NS_IMETHOD Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus);
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virtual void AddInlineMinWidth(nsIRenderingContext *aRenderingContext,
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InlineMinWidthData *aData);
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virtual void AddInlinePrefWidth(nsIRenderingContext *aRenderingContext,
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InlinePrefWidthData *aData);
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virtual nscoord GetMinWidth(nsIRenderingContext *aRenderingContext);
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virtual nscoord GetPrefWidth(nsIRenderingContext *aRenderingContext);
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virtual nsIAtom* GetType() const;
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virtual PRBool IsFrameOfType(PRUint32 aFlags) const
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{
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return nsFrame::IsFrameOfType(aFlags & ~(nsIFrame::eReplaced |
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nsIFrame::eLineParticipant));
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}
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#ifdef ACCESSIBILITY
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NS_IMETHOD GetAccessible(nsIAccessible** aAccessible);
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#endif
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protected:
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BRFrame(nsStyleContext* aContext) : nsFrame(aContext) {}
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virtual ~BRFrame();
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};
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nsIFrame*
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NS_NewBRFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
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return new (aPresShell) BRFrame(aContext);
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}
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BRFrame::~BRFrame()
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{
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}
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NS_IMETHODIMP
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BRFrame::Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aMetrics,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus)
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{
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DO_GLOBAL_REFLOW_COUNT("BRFrame");
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DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aStatus);
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aMetrics.height = 0; // BR frames with height 0 are ignored in quirks
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// mode by nsLineLayout::VerticalAlignFrames .
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// However, it's not always 0. See below.
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aMetrics.width = 0;
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aMetrics.ascent = 0;
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// Only when the BR is operating in a line-layout situation will it
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// behave like a BR.
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nsLineLayout* ll = aReflowState.mLineLayout;
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if (ll) {
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// Note that the compatibility mode check excludes AlmostStandards
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// mode, since this is the inline box model. See bug 161691.
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if ( ll->CanPlaceFloatNow() ||
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aPresContext->CompatibilityMode() == eCompatibility_FullStandards ) {
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// If we can place a float on the line now it means that the
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// line is effectively empty (there may be zero sized compressed
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// white-space frames on the line, but they are to be ignored).
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//
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// If this frame is going to terminate the line we know
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// that nothing else will go on the line. Therefore, in this
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// case, we provide some height for the BR frame so that it
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// creates some vertical whitespace. It's necessary to use the
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// line-height rather than the font size because the
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// quirks-mode fix that doesn't apply the block's min
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// line-height makes this necessary to make BR cause a line
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// of the full line-height
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// We also do this in strict mode because BR should act like a
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// normal inline frame. That line-height is used is important
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// here for cases where the line-height is less that 1.
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nsLayoutUtils::SetFontFromStyle(aReflowState.rendContext, mStyleContext);
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nsCOMPtr<nsIFontMetrics> fm;
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aReflowState.rendContext->GetFontMetrics(*getter_AddRefs(fm));
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if (fm) {
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nscoord ascent, descent;
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fm->GetMaxAscent(ascent);
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fm->GetMaxDescent(descent);
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nscoord logicalHeight =
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aReflowState.CalcLineHeight(aReflowState.rendContext, this);
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nscoord leading = logicalHeight - ascent - descent;
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aMetrics.height = logicalHeight;
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aMetrics.ascent = ascent + (leading/2);
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}
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else {
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aMetrics.ascent = aMetrics.height = 0;
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}
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// XXX temporary until I figure out a better solution; see the
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// code in nsLineLayout::VerticalAlignFrames that zaps minY/maxY
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// if the width is zero.
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// XXX This also fixes bug 10036!
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// Warning: nsTextControlFrame::CalculateSizeStandard depends on
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// the following line, see bug 228752.
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aMetrics.width = 1;
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}
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// Return our reflow status
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PRUint32 breakType = aReflowState.mStyleDisplay->mBreakType;
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if (NS_STYLE_CLEAR_NONE == breakType) {
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breakType = NS_STYLE_CLEAR_LINE;
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}
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aStatus = NS_INLINE_BREAK | NS_INLINE_BREAK_AFTER |
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NS_INLINE_MAKE_BREAK_TYPE(breakType);
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ll->SetLineEndsInBR(PR_TRUE);
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}
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else {
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aStatus = NS_FRAME_COMPLETE;
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}
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aMetrics.mOverflowArea = nsRect(0, 0, aMetrics.width, aMetrics.height);
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NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aMetrics);
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return NS_OK;
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}
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/* virtual */ void
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BRFrame::AddInlineMinWidth(nsIRenderingContext *aRenderingContext,
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nsIFrame::InlineMinWidthData *aData)
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{
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aData->ForceBreak(aRenderingContext);
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}
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/* virtual */ void
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BRFrame::AddInlinePrefWidth(nsIRenderingContext *aRenderingContext,
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nsIFrame::InlinePrefWidthData *aData)
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{
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aData->ForceBreak(aRenderingContext);
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}
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/* virtual */ nscoord
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BRFrame::GetMinWidth(nsIRenderingContext *aRenderingContext)
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{
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nscoord result = 0;
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DISPLAY_MIN_WIDTH(this, result);
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return result;
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}
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/* virtual */ nscoord
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BRFrame::GetPrefWidth(nsIRenderingContext *aRenderingContext)
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{
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nscoord result = 0;
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DISPLAY_PREF_WIDTH(this, result);
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return result;
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}
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nsIAtom*
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BRFrame::GetType() const
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{
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return nsGkAtoms::brFrame;
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}
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nsIFrame::ContentOffsets BRFrame::CalcContentOffsetsFromFramePoint(nsPoint aPoint)
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{
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ContentOffsets offsets;
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offsets.content = mContent->GetParent();
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if (offsets.content) {
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offsets.offset = offsets.content->IndexOf(mContent);
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offsets.secondaryOffset = offsets.offset;
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offsets.associateWithNext = PR_TRUE;
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}
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return offsets;
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}
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PRBool
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BRFrame::PeekOffsetNoAmount(PRBool aForward, PRInt32* aOffset)
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{
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NS_ASSERTION (aOffset && *aOffset <= 1, "aOffset out of range");
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PRInt32 startOffset = *aOffset;
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// If we hit the end of a BR going backwards, go to its beginning and stay there.
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if (!aForward && startOffset != 0) {
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*aOffset = 0;
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return PR_TRUE;
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}
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// Otherwise, stop if we hit the beginning, continue (forward) if we hit the end.
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return (startOffset == 0);
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}
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PRBool
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BRFrame::PeekOffsetCharacter(PRBool aForward, PRInt32* aOffset)
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{
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NS_ASSERTION (aOffset && *aOffset <= 1, "aOffset out of range");
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// Keep going. The actual line jumping will stop us.
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return PR_FALSE;
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}
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PRBool
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BRFrame::PeekOffsetWord(PRBool aForward, PRBool aWordSelectEatSpace, PRBool aIsKeyboardSelect,
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PRInt32* aOffset, PeekWordState* aState)
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{
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NS_ASSERTION (aOffset && *aOffset <= 1, "aOffset out of range");
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// Keep going. The actual line jumping will stop us.
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return PR_FALSE;
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}
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#ifdef ACCESSIBILITY
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NS_IMETHODIMP BRFrame::GetAccessible(nsIAccessible** aAccessible)
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{
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NS_ENSURE_TRUE(mContent, NS_ERROR_FAILURE);
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nsCOMPtr<nsIAccessibilityService> accService = do_GetService("@mozilla.org/accessibilityService;1");
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NS_ENSURE_TRUE(accService, NS_ERROR_FAILURE);
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nsCOMPtr<nsIContent> parent = mContent->GetBindingParent();
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if (parent && parent->IsNativeAnonymous() && parent->GetChildCount() == 1) {
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// This <br> is the only node in a text control, therefore it is the hacky
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// "bogus node" used when there is no text in the control
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return NS_ERROR_FAILURE;
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}
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return accService->CreateHTMLBRAccessible(static_cast<nsIFrame*>(this), aAccessible);
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}
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#endif
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