зеркало из https://github.com/mozilla/gecko-dev.git
250 строки
8.6 KiB
C++
250 строки
8.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the 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 Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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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 "nsHTMLIIDs.h"
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#include "nsIPresContext.h"
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#include "nsLineLayout.h"
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#include "nsStyleConsts.h"
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#include "nsHTMLAtoms.h"
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#include "nsIStyleContext.h"
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#include "nsIFontMetrics.h"
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#include "nsIRenderingContext.h"
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#include "nsLayoutAtoms.h"
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//FOR SELECTION
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#include "nsIContent.h"
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#include "nsIFrameSelection.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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// nsIFrame
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#ifdef NS_DEBUG
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NS_IMETHOD Paint(nsIPresContext* aPresContext,
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nsIRenderingContext& aRenderingContext,
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const nsRect& aDirtyRect,
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nsFramePaintLayer aWhichLayer);
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#endif
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NS_IMETHOD GetContentAndOffsetsFromPoint(nsIPresContext* aCX,
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const nsPoint& aPoint,
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nsIContent** aNewContent,
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PRInt32& aContentOffset,
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PRInt32& aContentOffsetEnd,
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PRBool& aBeginFrameContent);
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NS_IMETHOD PeekOffset(nsIPresContext* aPresContext,
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nsPeekOffsetStruct *aPos);
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// nsIHTMLReflow
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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 GetFrameType(nsIAtom** aType) const;
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protected:
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virtual ~BRFrame();
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};
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nsresult
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NS_NewBRFrame(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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nsIFrame* frame = new (aPresShell) BRFrame;
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if (nsnull == frame) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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*aNewFrame = frame;
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return NS_OK;
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}
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BRFrame::~BRFrame()
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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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BRFrame::Paint(nsIPresContext* aPresContext,
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nsIRenderingContext& aRenderingContext,
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const nsRect& aDirtyRect,
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nsFramePaintLayer aWhichLayer)
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{
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if ((NS_FRAME_PAINT_LAYER_DEBUG == aWhichLayer) && GetShowFrameBorders()) {
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float p2t;
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aPresContext->GetPixelsToTwips(&p2t);
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nscoord five = NSIntPixelsToTwips(5, p2t);
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aRenderingContext.SetColor(NS_RGB(0, 255, 255));
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aRenderingContext.FillRect(0, 0, five, five*2);
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}
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return NS_OK;
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}
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#endif
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NS_IMETHODIMP
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BRFrame::Reflow(nsIPresContext* 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", aReflowState.reason);
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if (aMetrics.maxElementSize) {
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aMetrics.maxElementSize->width = 0;
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aMetrics.maxElementSize->height = 0;
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}
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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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aMetrics.descent = 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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if ( ll->CanPlaceFloaterNow() || ll->InStrictMode() ) {
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// If we can place a floater 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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const nsStyleFont* font = (const nsStyleFont*)
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mStyleContext->GetStyleData(eStyleStruct_Font);
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aReflowState.rendContext->SetFont(font->mFont);
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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(aPresContext,
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aReflowState.rendContext,
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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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aMetrics.descent = logicalHeight - aMetrics.ascent;
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// = descent + (leading/2), but without rounding error
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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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aMetrics.width = 1;
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// Update max-element-size to keep us honest
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if (aMetrics.maxElementSize) {
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if (aMetrics.width > aMetrics.maxElementSize->width) {
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aMetrics.maxElementSize->width = aMetrics.width;
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}
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if (aMetrics.height > aMetrics.maxElementSize->height) {
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aMetrics.maxElementSize->height = aMetrics.height;
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}
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}
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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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return NS_OK;
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}
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NS_IMETHODIMP
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BRFrame::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::brFrame;
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NS_ADDREF(*aType);
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return NS_OK;
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}
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NS_IMETHODIMP BRFrame::GetContentAndOffsetsFromPoint(nsIPresContext* aCX,
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const nsPoint& aPoint,
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nsIContent ** aContent,
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PRInt32& aOffsetBegin,
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PRInt32& aOffsetEnd,
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PRBool& aBeginFrameContent)
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{
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if (!mContent)
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return NS_ERROR_NULL_POINTER;
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nsresult result = mContent->GetParent(*aContent);
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if (NS_SUCCEEDED(result) && *aContent)
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result = (*aContent)->IndexOf(mContent, aOffsetBegin);
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aOffsetEnd = aOffsetBegin;
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aBeginFrameContent = PR_TRUE;
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return result;
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}
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NS_IMETHODIMP BRFrame::PeekOffset(nsIPresContext* aPresContext, nsPeekOffsetStruct *aPos)
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{
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if (!aPos)
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return NS_ERROR_NULL_POINTER;
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nsCOMPtr<nsIContent> parentContent;
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PRInt32 offsetBegin; //offset of this content in its parents child list. base 0
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nsresult result = mContent->GetParent(*getter_AddRefs(parentContent));
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if (NS_SUCCEEDED(result) && parentContent)
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result = parentContent->IndexOf(mContent, offsetBegin);
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if (aPos->mAmount != eSelectLine && aPos->mAmount != eSelectBeginLine
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&& aPos->mAmount != eSelectEndLine) //then we must do the adjustment to make sure we leave this frame
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{
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if (aPos->mDirection == eDirNext)
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aPos->mStartOffset = offsetBegin +1;//go to end to make sure we jump to next node.
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else
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aPos->mStartOffset = offsetBegin; //we start at beginning to make sure we leave this frame.
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}
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return nsFrame::PeekOffset(aPresContext, aPos);//now we let the default take over.
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}
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