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https://gitlab.winehq.org/wine/wine-gecko.git
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218 lines
7.5 KiB
C++
218 lines
7.5 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 that goes directly inside the document's scrollbars */
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#ifndef nsCanvasFrame_h___
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#define nsCanvasFrame_h___
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#include "nsHTMLContainerFrame.h"
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#include "nsStyleContext.h"
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#include "nsIRenderingContext.h"
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#include "nsGUIEvent.h"
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#include "nsGkAtoms.h"
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#include "nsIScrollPositionListener.h"
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#include "nsDisplayList.h"
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#include "nsAbsoluteContainingBlock.h"
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class nsPresContext;
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/**
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* Root frame class.
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*
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* The root frame is the parent frame for the document element's frame.
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* It only supports having a single child frame which must be an area
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* frame
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*/
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class nsCanvasFrame : public nsHTMLContainerFrame,
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public nsIScrollPositionListener
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{
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public:
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nsCanvasFrame(nsStyleContext* aContext)
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: nsHTMLContainerFrame(aContext),
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mDoPaintFocus(PR_FALSE),
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mAddedScrollPositionListener(PR_FALSE),
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mAbsoluteContainer(nsGkAtoms::absoluteList) {}
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NS_DECL_QUERYFRAME_TARGET(nsCanvasFrame)
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NS_DECL_QUERYFRAME
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NS_DECL_FRAMEARENA_HELPERS
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virtual void DestroyFrom(nsIFrame* aDestructRoot);
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NS_IMETHOD SetInitialChildList(nsIAtom* aListName,
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nsFrameList& aChildList);
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NS_IMETHOD AppendFrames(nsIAtom* aListName,
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nsFrameList& aFrameList);
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NS_IMETHOD InsertFrames(nsIAtom* aListName,
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nsIFrame* aPrevFrame,
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nsFrameList& aFrameList);
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NS_IMETHOD RemoveFrame(nsIAtom* aListName,
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nsIFrame* aOldFrame);
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virtual nsIAtom* GetAdditionalChildListName(PRInt32 aIndex) const;
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virtual nsFrameList GetChildList(nsIAtom* aListName) const;
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virtual nscoord GetMinWidth(nsIRenderingContext *aRenderingContext);
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virtual nscoord GetPrefWidth(nsIRenderingContext *aRenderingContext);
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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 PRBool IsContainingBlock() const { return PR_TRUE; }
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virtual PRBool IsFrameOfType(PRUint32 aFlags) const
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{
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return nsHTMLContainerFrame::IsFrameOfType(aFlags &
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~(nsIFrame::eCanContainOverflowContainers));
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}
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/** SetHasFocus tells the CanvasFrame to draw with focus ring
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* @param aHasFocus PR_TRUE to show focus ring, PR_FALSE to hide it
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*/
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NS_IMETHOD SetHasFocus(PRBool aHasFocus);
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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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void PaintFocus(nsIRenderingContext& aRenderingContext, nsPoint aPt);
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// nsIScrollPositionListener
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virtual void ScrollPositionWillChange(nscoord aX, nscoord aY);
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virtual void ScrollPositionDidChange(nscoord aX, nscoord aY) {}
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/**
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* Get the "type" of the frame
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*
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* @see nsGkAtoms::canvasFrame
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*/
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virtual nsIAtom* GetType() const;
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virtual nsresult StealFrame(nsPresContext* aPresContext,
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nsIFrame* aChild,
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PRBool aForceNormal)
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{
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NS_ASSERTION(!aForceNormal, "No-one should be passing this in here");
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// nsCanvasFrame keeps overflow container continuations of its child
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// frame in main child list
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nsresult rv = nsContainerFrame::StealFrame(aPresContext, aChild, PR_TRUE);
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if (NS_FAILED(rv)) {
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rv = nsContainerFrame::StealFrame(aPresContext, aChild);
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}
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return rv;
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}
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#ifdef DEBUG
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NS_IMETHOD GetFrameName(nsAString& aResult) const;
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#endif
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NS_IMETHOD GetContentForEvent(nsPresContext* aPresContext,
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nsEvent* aEvent,
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nsIContent** aContent);
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nsRect CanvasArea() const;
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protected:
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virtual PRIntn GetSkipSides() const;
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// Data members
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PRPackedBool mDoPaintFocus;
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PRPackedBool mAddedScrollPositionListener;
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nsAbsoluteContainingBlock mAbsoluteContainer;
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};
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/**
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* Override nsDisplayBackground methods so that we pass aBGClipRect to
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* PaintBackground, covering the whole overflow area.
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* We can also paint an "extra background color" behind the normal
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* background.
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*/
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class nsDisplayCanvasBackground : public nsDisplayBackground {
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public:
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nsDisplayCanvasBackground(nsDisplayListBuilder* aBuilder, nsIFrame *aFrame)
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: nsDisplayBackground(aBuilder, aFrame)
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{
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mExtraBackgroundColor = NS_RGBA(0,0,0,0);
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}
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virtual PRBool ComputeVisibility(nsDisplayListBuilder* aBuilder,
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nsRegion* aVisibleRegion)
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{
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return NS_GET_A(mExtraBackgroundColor) > 0 ||
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nsDisplayBackground::ComputeVisibility(aBuilder, aVisibleRegion);
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}
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virtual PRBool IsOpaque(nsDisplayListBuilder* aBuilder)
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{
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return NS_GET_A(mExtraBackgroundColor) == 255 ||
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nsDisplayBackground::IsOpaque(aBuilder);
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}
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virtual PRBool IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor)
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{
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nscolor background;
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if (!nsDisplayBackground::IsUniform(aBuilder, &background))
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return PR_FALSE;
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NS_ASSERTION(background == NS_RGBA(0,0,0,0),
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"The nsDisplayBackground for a canvas frame doesn't paint "
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"its background color normally");
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*aColor = mExtraBackgroundColor;
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return PR_TRUE;
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}
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virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder)
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{
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nsCanvasFrame* frame = static_cast<nsCanvasFrame*>(mFrame);
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return frame->CanvasArea() + ToReferenceFrame();
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}
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virtual void Paint(nsDisplayListBuilder* aBuilder,
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nsIRenderingContext* aCtx);
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void SetExtraBackgroundColor(nscolor aColor)
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{
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mExtraBackgroundColor = aColor;
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}
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NS_DISPLAY_DECL_NAME("CanvasBackground", TYPE_CANVAS_BACKGROUND)
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private:
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nscolor mExtraBackgroundColor;
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};
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#endif /* nsCanvasFrame_h___ */
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