зеркало из https://github.com/mozilla/pjs.git
471 строка
16 KiB
C++
471 строка
16 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 "nsHTMLParts.h"
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#include "nsHTMLContainerFrame.h"
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#include "nsCSSRendering.h"
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#include "nsIDocument.h"
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#include "nsIReflowCommand.h"
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#include "nsIPresContext.h"
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#include "nsIStyleContext.h"
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#include "nsViewsCID.h"
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#include "nsIView.h"
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#include "nsIViewManager.h"
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#include "nsIWidget.h"
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#include "nsHTMLIIDs.h"
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#include "nsPageFrame.h"
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#include "nsIRenderingContext.h"
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#include "nsGUIEvent.h"
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#include "nsIDOMEvent.h"
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#include "nsStyleConsts.h"
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#include "nsIViewManager.h"
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#include "nsHTMLAtoms.h"
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#include "nsIEventStateManager.h"
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#include "nsIDeviceContext.h"
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#include "nsIScrollableView.h"
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#include "nsLayoutAtoms.h"
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#include "nsIPresShell.h"
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// Interface IDs
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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 CanvasFrame : public nsHTMLContainerFrame {
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public:
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NS_IMETHOD AppendFrames(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aFrameList);
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NS_IMETHOD InsertFrames(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aPrevFrame,
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nsIFrame* aFrameList);
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NS_IMETHOD RemoveFrame(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aOldFrame);
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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 HandleEvent(nsIPresContext* aPresContext,
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nsGUIEvent* aEvent,
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nsEventStatus* aEventStatus);
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NS_IMETHOD GetFrameForPoint(nsIPresContext* aPresContext,
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const nsPoint& aPoint,
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nsFramePaintLayer aWhichLayer,
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nsIFrame** aFrame);
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NS_IMETHOD IsPercentageBase(PRBool& aBase) const {
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aBase = PR_TRUE;
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return NS_OK;
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}
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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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/**
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* Get the "type" of the frame
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*
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* @see nsLayoutAtoms::canvasFrame
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*/
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NS_IMETHOD GetFrameType(nsIAtom** aType) const;
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NS_IMETHOD AttributeChanged(nsIPresContext* aPresContext,
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nsIContent* aChild,
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PRInt32 aNameSpaceID,
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nsIAtom* aAttribute,
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PRInt32 aHint);
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#ifdef DEBUG
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NS_IMETHOD GetFrameName(nsString& aResult) const;
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NS_IMETHOD SizeOf(nsISizeOfHandler* aHandler, PRUint32* aResult) const;
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#endif
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protected:
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virtual PRIntn GetSkipSides() const;
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};
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//----------------------------------------------------------------------
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nsresult
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NS_NewCanvasFrame(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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CanvasFrame* it = new (aPresShell)CanvasFrame;
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if (nsnull == it) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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*aNewFrame = it;
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return NS_OK;
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}
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NS_IMETHODIMP
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CanvasFrame::AppendFrames(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aFrameList)
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{
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nsresult rv;
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NS_ASSERTION(!aListName, "unexpected child list name");
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NS_PRECONDITION(mFrames.IsEmpty(), "already have a child frame");
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if (aListName) {
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// We only support unnamed principal child list
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rv = NS_ERROR_INVALID_ARG;
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} else if (!mFrames.IsEmpty()) {
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// We only allow a single child frame
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rv = NS_ERROR_FAILURE;
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} else {
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// Insert the new frames
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#ifdef NS_DEBUG
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nsFrame::VerifyDirtyBitSet(aFrameList);
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#endif
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mFrames.AppendFrame(nsnull, aFrameList);
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// Generate a reflow command to reflow the newly inserted frame
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nsIReflowCommand* reflowCmd;
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rv = NS_NewHTMLReflowCommand(&reflowCmd, this, nsIReflowCommand::ReflowDirty);
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if (NS_SUCCEEDED(rv)) {
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aPresShell.AppendReflowCommand(reflowCmd);
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NS_RELEASE(reflowCmd);
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}
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}
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return rv;
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}
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NS_IMETHODIMP
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CanvasFrame::InsertFrames(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aPrevFrame,
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nsIFrame* aFrameList)
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{
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nsresult rv;
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// Because we only support a single child frame inserting is the same
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// as appending
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NS_PRECONDITION(!aPrevFrame, "unexpected previous sibling frame");
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if (aPrevFrame) {
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rv = NS_ERROR_UNEXPECTED;
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} else {
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rv = AppendFrames(aPresContext, aPresShell, aListName, aFrameList);
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}
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return rv;
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}
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NS_IMETHODIMP
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CanvasFrame::RemoveFrame(nsIPresContext* aPresContext,
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nsIPresShell& aPresShell,
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nsIAtom* aListName,
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nsIFrame* aOldFrame)
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{
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nsresult rv;
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NS_ASSERTION(!aListName, "unexpected child list name");
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if (aListName) {
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// We only support the unnamed principal child list
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rv = NS_ERROR_INVALID_ARG;
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} else if (aOldFrame == mFrames.FirstChild()) {
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// It's our one and only child frame
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// Damage the area occupied by the deleted frame
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nsRect damageRect;
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aOldFrame->GetRect(damageRect);
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Invalidate(aPresContext, damageRect, PR_FALSE);
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// Remove the frame and destroy it
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mFrames.DestroyFrame(aPresContext, aOldFrame);
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// Generate a reflow command so we get reflowed
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nsIReflowCommand* reflowCmd;
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rv = NS_NewHTMLReflowCommand(&reflowCmd, this, nsIReflowCommand::ReflowDirty);
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if (NS_SUCCEEDED(rv)) {
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aPresShell.AppendReflowCommand(reflowCmd);
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NS_RELEASE(reflowCmd);
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}
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} else {
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rv = NS_ERROR_FAILURE;
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}
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return rv;
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}
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NS_IMETHODIMP
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CanvasFrame::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_BACKGROUND == aWhichLayer) {
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SetDefaultBackgroundColor(aPresContext);
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}
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return nsHTMLContainerFrame::Paint(aPresContext, aRenderingContext, aDirtyRect, aWhichLayer);
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}
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NS_IMETHODIMP
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CanvasFrame::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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{
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DO_GLOBAL_REFLOW_COUNT("CanvasFrame", aReflowState.reason);
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NS_FRAME_TRACE_REFLOW_IN("CanvasFrame::Reflow");
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NS_PRECONDITION(nsnull == aDesiredSize.maxElementSize, "unexpected request");
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// Initialize OUT parameter
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aStatus = NS_FRAME_COMPLETE;
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PRBool isStyleChange = PR_FALSE;
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PRBool isDirtyChildReflow = PR_FALSE;
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// Check for an incremental reflow
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if (eReflowReason_Incremental == aReflowState.reason) {
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// See if we're the target frame
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nsIFrame* targetFrame;
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aReflowState.reflowCommand->GetTarget(targetFrame);
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if (this == targetFrame) {
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// Get the reflow type
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nsIReflowCommand::ReflowType reflowType;
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aReflowState.reflowCommand->GetType(reflowType);
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switch (reflowType) {
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case nsIReflowCommand::ReflowDirty:
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isDirtyChildReflow = PR_TRUE;
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break;
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case nsIReflowCommand::StyleChanged:
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// Remember it's a style change so we can set the reflow reason below
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isStyleChange = PR_TRUE;
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break;
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default:
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NS_ASSERTION(PR_FALSE, "unexpected reflow command type");
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}
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} else {
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nsIFrame* nextFrame;
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// Get the next frame in the reflow chain
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aReflowState.reflowCommand->GetNext(nextFrame);
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NS_ASSERTION(nextFrame == mFrames.FirstChild(), "unexpected next reflow command frame");
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}
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}
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// Reflow our one and only child frame
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nsHTMLReflowMetrics kidDesiredSize(nsnull);
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if (mFrames.IsEmpty()) {
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// We have no child frame, so return an empty size
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aDesiredSize.width = aDesiredSize.height = 0;
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aDesiredSize.ascent = aDesiredSize.descent = 0;
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} else {
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nsIFrame* kidFrame = mFrames.FirstChild();
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// We must specify an unconstrained available height, because constrained
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// is only for when we're paginated...
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nsHTMLReflowState kidReflowState(aPresContext, aReflowState, kidFrame,
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nsSize(aReflowState.availableWidth,
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NS_UNCONSTRAINEDSIZE));
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if (isDirtyChildReflow) {
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// Note: the only reason the frame would be dirty would be if it had
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// just been inserted or appended
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kidReflowState.reason = eReflowReason_Initial;
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kidReflowState.reflowCommand = nsnull;
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} else if (isStyleChange) {
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kidReflowState.reason = eReflowReason_StyleChange;
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kidReflowState.reflowCommand = nsnull;
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}
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// Reflow the frame
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ReflowChild(kidFrame, aPresContext, kidDesiredSize, kidReflowState,
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kidReflowState.mComputedMargin.left, kidReflowState.mComputedMargin.top,
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0, aStatus);
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// The document element's background should cover the entire canvas, so
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// take into account the combined area and any space taken up by
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// absolutely positioned elements
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nsMargin border;
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nsFrameState kidState;
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if (!kidReflowState.mStyleBorder->GetBorder(border)) {
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NS_NOTYETIMPLEMENTED("percentage border");
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}
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kidFrame->GetFrameState(&kidState);
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// First check the combined area
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if (NS_FRAME_OUTSIDE_CHILDREN & kidState) {
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// The background covers the content area and padding area, so check
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// for children sticking outside the child frame's padding edge
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nscoord paddingEdgeX = kidDesiredSize.width - border.right;
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nscoord paddingEdgeY = kidDesiredSize.height - border.bottom;
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if (kidDesiredSize.mOverflowArea.XMost() > paddingEdgeX) {
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kidDesiredSize.width = kidDesiredSize.mOverflowArea.XMost() +
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border.right;
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}
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if (kidDesiredSize.mOverflowArea.YMost() > paddingEdgeY) {
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kidDesiredSize.height = kidDesiredSize.mOverflowArea.YMost() +
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border.bottom;
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}
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}
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// If our height is fixed, then make sure the child frame plus its top and
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// bottom margin is at least that high as well...
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if (NS_AUTOHEIGHT != aReflowState.mComputedHeight) {
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nscoord totalHeight = kidDesiredSize.height + kidReflowState.mComputedMargin.top +
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kidReflowState.mComputedMargin.bottom;
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if (totalHeight < aReflowState.mComputedHeight) {
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kidDesiredSize.height += aReflowState.mComputedHeight - totalHeight;
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}
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}
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// Complete the reflow and position and size the child frame
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nsRect rect(kidReflowState.mComputedMargin.left, kidReflowState.mComputedMargin.top,
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kidDesiredSize.width, kidDesiredSize.height);
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FinishReflowChild(kidFrame, aPresContext, kidDesiredSize, rect.x, rect.y, 0);
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// If the child frame was just inserted, then we're responsible for making sure
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// it repaints
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if (isDirtyChildReflow) {
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// Damage the area occupied by the deleted frame
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Invalidate(aPresContext, rect, PR_FALSE);
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}
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// Return our desired size
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aDesiredSize.width = kidDesiredSize.width + kidReflowState.mComputedMargin.left +
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kidReflowState.mComputedMargin.right;
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aDesiredSize.height = kidDesiredSize.height + kidReflowState.mComputedMargin.top +
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kidReflowState.mComputedMargin.bottom;
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aDesiredSize.ascent = aDesiredSize.height;
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aDesiredSize.descent = 0;
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// XXX Don't completely ignore NS_FRAME_OUTSIDE_CHILDREN for child frames
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// that stick out on the left or top edges...
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}
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NS_FRAME_TRACE_REFLOW_OUT("CanvasFrame::Reflow", aStatus);
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return NS_OK;
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}
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PRIntn
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CanvasFrame::GetSkipSides() const
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{
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return 0;
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}
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NS_IMETHODIMP
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CanvasFrame::HandleEvent(nsIPresContext* aPresContext,
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nsGUIEvent* aEvent,
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nsEventStatus* aEventStatus)
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{
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NS_ENSURE_ARG_POINTER(aEventStatus);
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if (nsEventStatus_eConsumeNoDefault == *aEventStatus) {
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return NS_OK;
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}
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if (aEvent->message == NS_MOUSE_LEFT_BUTTON_UP ||
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aEvent->message == NS_MOUSE_MIDDLE_BUTTON_UP ||
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aEvent->message == NS_MOUSE_RIGHT_BUTTON_UP ||
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aEvent->message == NS_MOUSE_MOVE ) {
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nsIFrame *firstChild;
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nsresult rv = FirstChild(aPresContext,nsnull,&firstChild);
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//canvas frame needs to pass mouse events to its area frame so that mouse movement
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//and selection code will work properly. this will still have the necessary effects
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//that would have happened if nsFrame::HandleEvent was called.
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if (NS_SUCCEEDED(rv) && firstChild)
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firstChild->HandleEvent(aPresContext, aEvent, aEventStatus);
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else
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nsFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
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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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CanvasFrame::GetFrameForPoint(nsIPresContext* aPresContext,
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const nsPoint& aPoint,
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nsFramePaintLayer aWhichLayer,
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nsIFrame** aFrame)
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{
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// this should act like a block, so we need to override
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return GetFrameForPointUsing(aPresContext, aPoint, nsnull, aWhichLayer, (aWhichLayer == NS_FRAME_PAINT_LAYER_BACKGROUND), aFrame);
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}
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NS_IMETHODIMP
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CanvasFrame::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::canvasFrame;
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NS_ADDREF(*aType);
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return NS_OK;
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}
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NS_IMETHODIMP
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CanvasFrame::AttributeChanged(nsIPresContext* aPresContext,
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nsIContent* aChild,
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PRInt32 aNameSpaceID,
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nsIAtom* aAttribute,
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PRInt32 aHint)
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{
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// if the background color or image is changing, invalidate the canvas
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if (aHint > 0){
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if (aAttribute == nsHTMLAtoms::bgcolor ||
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aAttribute == nsHTMLAtoms::background) {
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Invalidate(aPresContext,mRect,PR_FALSE);
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}
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}
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return NS_OK;
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}
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#ifdef DEBUG
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NS_IMETHODIMP
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CanvasFrame::GetFrameName(nsString& aResult) const
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{
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return MakeFrameName("Canvas", aResult);
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}
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NS_IMETHODIMP
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CanvasFrame::SizeOf(nsISizeOfHandler* aHandler, PRUint32* aResult) const
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{
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if (!aResult) {
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return NS_ERROR_NULL_POINTER;
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}
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*aResult = sizeof(*this);
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return NS_OK;
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}
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#endif
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