зеркало из https://github.com/mozilla/pjs.git
194 строки
8.6 KiB
C++
194 строки
8.6 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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/* base class #2 for rendering objects that have child lists */
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#ifndef nsHTMLContainerFrame_h___
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#define nsHTMLContainerFrame_h___
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#include "nsContainerFrame.h"
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#include "gfxPoint.h"
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#include "nsIDeviceContext.h"
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class nsString;
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class nsAbsoluteFrame;
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class nsPlaceholderFrame;
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struct nsStyleDisplay;
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struct nsStylePosition;
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struct nsHTMLReflowMetrics;
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struct nsHTMLReflowState;
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class nsLineBox;
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// Some macros for container classes to do sanity checking on
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// width/height/x/y values computed during reflow.
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#ifdef DEBUG
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#define CRAZY_W (1000000*nsIDeviceContext::AppUnitsPerCSSPixel())
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#define CRAZY_H CRAZY_W
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#define CRAZY_WIDTH(_x) (((_x) < -CRAZY_W) || ((_x) > CRAZY_W))
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#define CRAZY_HEIGHT(_y) (((_y) < -CRAZY_H) || ((_y) > CRAZY_H))
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#endif
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class nsDisplayTextDecoration;
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// Base class for html container frames that provides common
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// functionality.
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class nsHTMLContainerFrame : public nsContainerFrame {
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public:
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NS_DECL_FRAMEARENA_HELPERS
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/**
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* Helper method to wrap views around frames. Used by containers
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* under special circumstances (can be used by leaf frames as well)
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*/
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static nsresult CreateViewForFrame(nsIFrame* aFrame,
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PRBool aForce);
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static nsresult ReparentFrameView(nsPresContext* aPresContext,
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nsIFrame* aChildFrame,
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nsIFrame* aOldParentFrame,
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nsIFrame* aNewParentFrame);
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static nsresult ReparentFrameViewList(nsPresContext* aPresContext,
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const nsFrameList& aChildFrameList,
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nsIFrame* aOldParentFrame,
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nsIFrame* aNewParentFrame);
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/**
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* Helper method to create next-in-flows if necessary. If aFrame
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* already has a next-in-flow then this method does
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* nothing. Otherwise, a new continuation frame is created and
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* linked into the flow. In addition, the new frame is inserted
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* into the principal child list after aFrame.
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* @note calling this method on a block frame is illegal. Use
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* nsBlockFrame::CreateContinuationFor() instead.
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* @param aNextInFlowResult will contain the next-in-flow
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* <b>if and only if</b> one is created. If a next-in-flow already
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* exists aNextInFlowResult is set to nsnull.
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* @return NS_OK if a next-in-flow already exists or is successfully created.
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*/
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nsresult CreateNextInFlow(nsPresContext* aPresContext,
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nsIFrame* aFrame,
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nsIFrame*& aNextInFlowResult);
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/**
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* Displays the standard border, background and outline for the frame
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* and calls DisplayTextDecorationsAndChildren. This is suitable for
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* inline frames or frames that behave like inlines.
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*/
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NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists);
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nsresult DisplayTextDecorations(nsDisplayListBuilder* aBuilder,
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nsDisplayList* aBelowTextDecorations,
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nsDisplayList* aAboveTextDecorations,
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nsLineBox* aLine);
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protected:
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nsHTMLContainerFrame(nsStyleContext *aContext) : nsContainerFrame(aContext) {}
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/**
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* Displays the below-children decorations, then the children, then
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* the above-children decorations, with the decorations going in the
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* Content() list. This is suitable for inline elements and elements
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* that behave like inline elements (e.g. MathML containers).
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*/
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nsresult DisplayTextDecorationsAndChildren(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists);
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/**
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* Fetch the text decorations for this frame.
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* @param aIsBlock whether |this| is a block frame or no.
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* @param aDecorations mask with all decorations.
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* See bug 1777 and 20163 to understand how a
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* frame can end up with several decorations.
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* @param aUnderColor The color of underline if the appropriate bit
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* in aDecoration is set. It is undefined otherwise.
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* @param aOverColor The color of overline if the appropriate bit
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* in aDecoration is set. It is undefined otherwise.
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* @param aStrikeColor The color of strike-through if the appropriate bit
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* in aDecoration is set. It is undefined otherwise.
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* NOTE: This function assigns NS_STYLE_TEXT_DECORATION_NONE to
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* aDecorations for text-less frames. See bug 20163 for
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* details.
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*/
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void GetTextDecorations(nsPresContext* aPresContext,
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PRBool aIsBlock,
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PRUint8& aDecorations,
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nscolor& aUnderColor,
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nscolor& aOverColor,
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nscolor& aStrikeColor);
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/**
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* Function that does the actual drawing of the textdecoration.
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* input:
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* @param aCtx the Thebes graphics context to draw on
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* @param aLine the line, or nsnull if this is an inline frame
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* @param aColor the color of the text-decoration
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* @param aAscent ascent of the font from which the
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* text-decoration was derived.
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* @param aOffset distance *above* baseline where the
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* text-decoration should be drawn,
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* i.e. negative offsets draws *below*
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* the baseline.
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* @param aSize the thickness of the line
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* @param aDecoration which line will be painted
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* i.e., NS_STYLE_TEXT_DECORATION_UNDERLINE or
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* NS_STYLE_TEXT_DECORATION_OVERLINE or
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* NS_STYLE_TEXT_DECORATION_LINE_THROUGH.
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*/
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virtual void PaintTextDecorationLine(gfxContext* aCtx,
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const nsPoint& aPt,
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nsLineBox* aLine,
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nscolor aColor,
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gfxFloat aOffset,
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gfxFloat aAscent,
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gfxFloat aSize,
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const PRUint8 aDecoration);
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virtual void AdjustForTextIndent(const nsLineBox* aLine,
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nscoord& start,
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nscoord& width);
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friend class nsDisplayTextDecoration;
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friend class nsDisplayTextShadow;
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};
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#endif /* nsHTMLContainerFrame_h___ */
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