gecko-dev/layout/generic/nsHTMLContainerFrame.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
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*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
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*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* base class #2 for rendering objects that have child lists */
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#ifndef nsHTMLContainerFrame_h___
#define nsHTMLContainerFrame_h___
#include "nsContainerFrame.h"
#include "gfxPoint.h"
#include "nsIDeviceContext.h"
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class nsString;
class nsAbsoluteFrame;
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class nsPlaceholderFrame;
struct nsStyleDisplay;
struct nsStylePosition;
struct nsHTMLReflowMetrics;
struct nsHTMLReflowState;
class nsLineBox;
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// Some macros for container classes to do sanity checking on
// width/height/x/y values computed during reflow.
#ifdef DEBUG
#define CRAZY_W (1000000*nsIDeviceContext::AppUnitsPerCSSPixel())
#define CRAZY_H CRAZY_W
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#define CRAZY_WIDTH(_x) (((_x) < -CRAZY_W) || ((_x) > CRAZY_W))
#define CRAZY_HEIGHT(_y) (((_y) < -CRAZY_H) || ((_y) > CRAZY_H))
#endif
class nsDisplayTextDecoration;
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// Base class for html container frames that provides common
// functionality.
class nsHTMLContainerFrame : public nsContainerFrame {
public:
NS_DECL_FRAMEARENA_HELPERS
/**
* Helper method to wrap views around frames. Used by containers
* under special circumstances (can be used by leaf frames as well)
*/
static nsresult CreateViewForFrame(nsIFrame* aFrame,
PRBool aForce);
static nsresult ReparentFrameView(nsPresContext* aPresContext,
nsIFrame* aChildFrame,
nsIFrame* aOldParentFrame,
nsIFrame* aNewParentFrame);
static nsresult ReparentFrameViewList(nsPresContext* aPresContext,
const nsFrameList& aChildFrameList,
nsIFrame* aOldParentFrame,
nsIFrame* aNewParentFrame);
/**
* Helper method to create next-in-flows if necessary. If aFrame
* already has a next-in-flow then this method does
* nothing. Otherwise, a new continuation frame is created and
* linked into the flow. In addition, the new frame is inserted
* into the principal child list after aFrame.
* @note calling this method on a block frame is illegal. Use
* nsBlockFrame::CreateContinuationFor() instead.
* @param aNextInFlowResult will contain the next-in-flow
* <b>if and only if</b> one is created. If a next-in-flow already
* exists aNextInFlowResult is set to nsnull.
* @return NS_OK if a next-in-flow already exists or is successfully created.
*/
nsresult CreateNextInFlow(nsPresContext* aPresContext,
nsIFrame* aFrame,
nsIFrame*& aNextInFlowResult);
/**
* Displays the standard border, background and outline for the frame
* and calls DisplayTextDecorationsAndChildren. This is suitable for
* inline frames or frames that behave like inlines.
*/
NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists);
nsresult DisplayTextDecorations(nsDisplayListBuilder* aBuilder,
nsDisplayList* aBelowTextDecorations,
nsDisplayList* aAboveTextDecorations,
nsLineBox* aLine);
protected:
nsHTMLContainerFrame(nsStyleContext *aContext) : nsContainerFrame(aContext) {}
/**
* Displays the below-children decorations, then the children, then
* the above-children decorations, with the decorations going in the
* Content() list. This is suitable for inline elements and elements
* that behave like inline elements (e.g. MathML containers).
*/
nsresult DisplayTextDecorationsAndChildren(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists);
/**
* Fetch the text decorations for this frame.
* @param aIsBlock whether |this| is a block frame or no.
* @param aDecorations mask with all decorations.
* See bug 1777 and 20163 to understand how a
* frame can end up with several decorations.
* @param aUnderColor The color of underline if the appropriate bit
* in aDecoration is set. It is undefined otherwise.
* @param aOverColor The color of overline if the appropriate bit
* in aDecoration is set. It is undefined otherwise.
* @param aStrikeColor The color of strike-through if the appropriate bit
* in aDecoration is set. It is undefined otherwise.
* NOTE: This function assigns NS_STYLE_TEXT_DECORATION_NONE to
* aDecorations for text-less frames. See bug 20163 for
* details.
*/
void GetTextDecorations(nsPresContext* aPresContext,
PRBool aIsBlock,
PRUint8& aDecorations,
nscolor& aUnderColor,
nscolor& aOverColor,
nscolor& aStrikeColor);
/**
* Function that does the actual drawing of the textdecoration.
* input:
* @param aCtx the Thebes graphics context to draw on
* @param aLine the line, or nsnull if this is an inline frame
* @param aColor the color of the text-decoration
* @param aAscent ascent of the font from which the
* text-decoration was derived.
* @param aOffset distance *above* baseline where the
* text-decoration should be drawn,
* i.e. negative offsets draws *below*
* the baseline.
* @param aSize the thickness of the line
* @param aDecoration which line will be painted
* i.e., NS_STYLE_TEXT_DECORATION_UNDERLINE or
* NS_STYLE_TEXT_DECORATION_OVERLINE or
* NS_STYLE_TEXT_DECORATION_LINE_THROUGH.
*/
virtual void PaintTextDecorationLine(gfxContext* aCtx,
const nsPoint& aPt,
nsLineBox* aLine,
nscolor aColor,
gfxFloat aOffset,
gfxFloat aAscent,
gfxFloat aSize,
const PRUint8 aDecoration);
virtual void AdjustForTextIndent(const nsLineBox* aLine,
nscoord& start,
nscoord& width);
friend class nsDisplayTextDecoration;
friend class nsDisplayTextShadow;
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};
#endif /* nsHTMLContainerFrame_h___ */