зеркало из https://github.com/mozilla/pjs.git
133 строки
4.1 KiB
C++
133 строки
4.1 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 License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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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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class BRFrame : public nsFrame {
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public:
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// nsIFrame
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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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// 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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protected:
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virtual ~BRFrame();
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};
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nsresult
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NS_NewBRFrame(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 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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NS_METHOD
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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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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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if (nsnull != 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;
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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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if (nsnull != aReflowState.lineLayout) {
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if (aReflowState.lineLayout->CanPlaceFloaterNow()) {
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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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// Because 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 only, we provide some height for the BR frame so that it
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// creates some vertical whitespace.
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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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nsIFontMetrics* fm;
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aReflowState.rendContext->GetFontMetrics(fm);
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fm->GetHeight(aMetrics.height);
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NS_RELEASE(fm);
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aMetrics.ascent = aMetrics.height;
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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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}
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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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