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https://github.com/mozilla/gecko-dev.git
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84b8b6bf64
There was nothing wrong with SetFontFromStyle, except that it's just one more API to think about (and one more API to audit and modify for font inflation work to happen in bug 627842).
314 lines
10 KiB
C++
314 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 "nsRenderingContext.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 "nsAccessibilityService.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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#define BR_USING_CENTERED_FONT_BASELINE NS_FRAME_STATE_BIT(63)
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class BRFrame : public nsFrame {
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public:
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NS_DECL_FRAMEARENA_HELPERS
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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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PRBool aRespectClusters = PR_TRUE);
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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(nsRenderingContext *aRenderingContext,
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InlineMinWidthData *aData);
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virtual void AddInlinePrefWidth(nsRenderingContext *aRenderingContext,
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InlinePrefWidthData *aData);
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virtual nscoord GetMinWidth(nsRenderingContext *aRenderingContext);
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virtual nscoord GetPrefWidth(nsRenderingContext *aRenderingContext);
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virtual nsIAtom* GetType() const;
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virtual nscoord GetBaseline() 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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virtual already_AddRefed<nsAccessible> CreateAccessible();
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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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NS_IMPL_FRAMEARENA_HELPERS(BRFrame)
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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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RemoveStateBits(BR_USING_CENTERED_FONT_BASELINE);
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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->LineIsEmpty() ||
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aPresContext->CompatibilityMode() == eCompatibility_FullStandards ) {
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// The line is logically empty; any whitespace is trimmed away.
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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 than 1.
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nsRefPtr<nsFontMetrics> fm;
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nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm));
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aReflowState.rendContext->SetFont(fm); // FIXME: maybe not needed?
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if (fm) {
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nscoord logicalHeight = aReflowState.CalcLineHeight();
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aMetrics.height = logicalHeight;
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aMetrics.ascent =
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nsLayoutUtils::GetCenteredFontBaseline(fm, logicalHeight);
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AddStateBits(BR_USING_CENTERED_FONT_BASELINE);
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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.SetOverflowAreasToDesiredBounds();
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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(nsRenderingContext *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(nsRenderingContext *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(nsRenderingContext *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(nsRenderingContext *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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nscoord
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BRFrame::GetBaseline() const
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{
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nscoord ascent = 0;
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nsRefPtr<nsFontMetrics> fm;
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nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm));
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if (fm) {
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nscoord logicalHeight = GetRect().height;
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if (GetStateBits() & BR_USING_CENTERED_FONT_BASELINE) {
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ascent = nsLayoutUtils::GetCenteredFontBaseline(fm, logicalHeight);
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} else {
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ascent = fm->MaxAscent() + GetUsedBorderAndPadding().top;
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}
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}
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return NS_MIN(mRect.height, ascent);
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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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PRBool aRespectClusters)
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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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already_AddRefed<nsAccessible>
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BRFrame::CreateAccessible()
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{
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nsAccessibilityService* accService = nsIPresShell::AccService();
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if (!accService) {
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return nsnull;
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}
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nsIContent *parent = mContent->GetParent();
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if (parent &&
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parent->IsRootOfNativeAnonymousSubtree() &&
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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 nsnull;
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}
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return accService->CreateHTMLBRAccessible(mContent,
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PresContext()->PresShell());
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}
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#endif
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