зеркало из https://github.com/mozilla/pjs.git
660 строки
21 KiB
C++
660 строки
21 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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#include "nsIServiceManager.h"
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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 "nsPresContext.h"
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#include "nsStyleContext.h"
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#include "nsIView.h"
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#include "nsIViewManager.h"
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#include "nsIRenderingContext.h"
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#include "nsGUIEvent.h"
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#include "nsStyleConsts.h"
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#include "nsGkAtoms.h"
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#include "nsIEventStateManager.h"
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#include "nsIDeviceContext.h"
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#include "nsIPresShell.h"
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#include "nsIScrollPositionListener.h"
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#include "nsDisplayList.h"
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// for focus
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#include "nsIDOMWindowInternal.h"
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#include "nsIFocusController.h"
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#include "nsIScrollableFrame.h"
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#include "nsIScrollableView.h"
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#include "nsIDocShell.h"
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#include "nsICanvasFrame.h"
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#ifdef DEBUG_rods
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//#define DEBUG_CANVAS_FOCUS
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#endif
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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 nsIScrollPositionListener,
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public nsICanvasFrame {
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public:
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CanvasFrame(nsStyleContext* aContext)
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: nsHTMLContainerFrame(aContext), mDoPaintFocus(PR_FALSE) {}
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// nsISupports
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NS_IMETHOD QueryInterface(const nsIID& aIID, void** aInstancePtr);
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NS_IMETHOD Init(nsIContent* aContent,
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nsIFrame* aParent,
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nsIFrame* aPrevInFlow);
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virtual void Destroy();
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NS_IMETHOD AppendFrames(nsIAtom* aListName,
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nsIFrame* aFrameList);
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NS_IMETHOD InsertFrames(nsIAtom* aListName,
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nsIFrame* aPrevFrame,
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nsIFrame* aFrameList);
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NS_IMETHOD RemoveFrame(nsIAtom* aListName,
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nsIFrame* aOldFrame);
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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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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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NS_IMETHOD ScrollPositionWillChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY);
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NS_IMETHOD ScrollPositionDidChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY);
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// nsICanvasFrame
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NS_IMETHOD SetHasFocus(PRBool aHasFocus);
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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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#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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nsCOMPtr<nsIViewManager> mViewManager;
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private:
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NS_IMETHOD_(nsrefcnt) AddRef() { return NS_OK; }
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NS_IMETHOD_(nsrefcnt) Release() { return NS_OK; }
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};
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//----------------------------------------------------------------------
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nsIFrame*
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NS_NewCanvasFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
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return new (aPresShell)CanvasFrame(aContext);
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}
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//--------------------------------------------------------------
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// Frames are not refcounted, no need to AddRef
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NS_IMETHODIMP
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CanvasFrame::QueryInterface(const nsIID& aIID, void** aInstancePtr)
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{
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NS_PRECONDITION(0 != aInstancePtr, "null ptr");
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if (NULL == aInstancePtr) {
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return NS_ERROR_NULL_POINTER;
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}
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if (aIID.Equals(NS_GET_IID(nsIScrollPositionListener))) {
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*aInstancePtr = (void*) ((nsIScrollPositionListener*) this);
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return NS_OK;
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}
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if (aIID.Equals(NS_GET_IID(nsICanvasFrame))) {
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*aInstancePtr = (void*) ((nsICanvasFrame*) this);
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return NS_OK;
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}
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return nsHTMLContainerFrame::QueryInterface(aIID, aInstancePtr);
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}
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NS_IMETHODIMP
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CanvasFrame::Init(nsIContent* aContent,
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nsIFrame* aParent,
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nsIFrame* aPrevInFlow)
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{
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nsresult rv = nsHTMLContainerFrame::Init(aContent, aParent, aPrevInFlow);
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mViewManager = GetPresContext()->GetViewManager();
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nsIScrollableView* scrollingView = nsnull;
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mViewManager->GetRootScrollableView(&scrollingView);
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if (scrollingView) {
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scrollingView->AddScrollPositionListener(this);
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}
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return rv;
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}
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void
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CanvasFrame::Destroy()
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{
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nsIScrollableView* scrollingView = nsnull;
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mViewManager->GetRootScrollableView(&scrollingView);
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if (scrollingView) {
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scrollingView->RemoveScrollPositionListener(this);
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}
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nsHTMLContainerFrame::Destroy();
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}
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NS_IMETHODIMP
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CanvasFrame::ScrollPositionWillChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY)
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{
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#ifdef DEBUG_CANVAS_FOCUS
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{
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PRBool hasFocus = PR_FALSE;
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nsCOMPtr<nsIViewObserver> observer;
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mViewManager->GetViewObserver(*getter_AddRefs(observer));
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nsCOMPtr<nsIPresShell> shell = do_QueryInterface(observer);
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nsCOMPtr<nsPresContext> context;
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shell->GetPresContext(getter_AddRefs(context));
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nsCOMPtr<nsISupports> container;
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context->GetContainer(getter_AddRefs(container));
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nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(container));
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if (docShell) {
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docShell->GetHasFocus(&hasFocus);
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}
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printf("SPWC: %p HF: %s mDoPaintFocus: %s\n", docShell.get(), hasFocus?"Y":"N", mDoPaintFocus?"Y":"N");
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}
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#endif
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if (mDoPaintFocus) {
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mDoPaintFocus = PR_FALSE;
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mViewManager->UpdateAllViews(NS_VMREFRESH_NO_SYNC);
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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::ScrollPositionDidChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY)
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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::SetHasFocus(PRBool aHasFocus)
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{
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if (mDoPaintFocus != aHasFocus) {
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mDoPaintFocus = aHasFocus;
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nsIViewManager* vm = GetPresContext()->PresShell()->GetViewManager();
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if (vm) {
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vm->UpdateAllViews(NS_VMREFRESH_NO_SYNC);
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}
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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::AppendFrames(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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rv = GetPresContext()->PresShell()->
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FrameNeedsReflow(this, nsIPresShell::eTreeChange);
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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(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(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(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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// The child of the canvas probably can't have an outline, but why bother
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// thinking about that?
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Invalidate(aOldFrame->GetOverflowRect() + aOldFrame->GetPosition(), PR_FALSE);
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// Remove the frame and destroy it
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mFrames.DestroyFrame(aOldFrame);
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AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
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rv = GetPresContext()->PresShell()->
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FrameNeedsReflow(this, nsIPresShell::eTreeChange);
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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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nsRect CanvasFrame::CanvasArea() const
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{
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nsRect result(GetOverflowRect());
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nsIScrollableFrame *scrollableFrame;
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CallQueryInterface(GetParent(), &scrollableFrame);
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if (scrollableFrame) {
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nsIScrollableView* scrollableView = scrollableFrame->GetScrollableView();
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nsRect vcr = scrollableView->View()->GetBounds();
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result.UnionRect(result, nsRect(nsPoint(0, 0), vcr.Size()));
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}
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return result;
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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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*/
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class nsDisplayCanvasBackground : public nsDisplayBackground {
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public:
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nsDisplayCanvasBackground(nsIFrame *aFrame)
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: nsDisplayBackground(aFrame)
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{
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}
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virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder)
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{
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CanvasFrame* frame = NS_STATIC_CAST(CanvasFrame*, mFrame);
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return frame->CanvasArea() + aBuilder->ToReferenceFrame(mFrame);
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}
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virtual void Paint(nsDisplayListBuilder* aBuilder,
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nsIRenderingContext* aCtx, const nsRect& aDirtyRect)
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{
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CanvasFrame* frame = NS_STATIC_CAST(CanvasFrame*, mFrame);
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nsPoint offset = aBuilder->ToReferenceFrame(mFrame);
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nsRect bgClipRect = frame->CanvasArea() + offset;
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nsCSSRendering::PaintBackground(mFrame->GetPresContext(), *aCtx, mFrame,
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aDirtyRect,
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nsRect(offset, mFrame->GetSize()),
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*mFrame->GetStyleBorder(),
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*mFrame->GetStylePadding(),
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mFrame->HonorPrintBackgroundSettings(),
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&bgClipRect);
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}
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NS_DISPLAY_DECL_NAME("CanvasBackground")
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};
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/**
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* A display item to paint the focus ring for the document.
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*
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* The only reason this can't use nsDisplayGeneric is overriding GetBounds.
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*/
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class nsDisplayCanvasFocus : public nsDisplayItem {
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public:
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nsDisplayCanvasFocus(CanvasFrame *aFrame)
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: nsDisplayItem(aFrame)
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{
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}
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virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder)
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{
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// This is an overestimate, but that's not a problem.
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CanvasFrame* frame = NS_STATIC_CAST(CanvasFrame*, mFrame);
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return frame->CanvasArea() + aBuilder->ToReferenceFrame(mFrame);
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}
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virtual void Paint(nsDisplayListBuilder* aBuilder,
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nsIRenderingContext* aCtx, const nsRect& aDirtyRect)
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{
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CanvasFrame* frame = NS_STATIC_CAST(CanvasFrame*, mFrame);
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frame->PaintFocus(*aCtx, aBuilder->ToReferenceFrame(mFrame));
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}
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NS_DISPLAY_DECL_NAME("CanvasFocus")
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};
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NS_IMETHODIMP
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CanvasFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists)
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{
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nsresult rv;
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// Force a background to be shown. We may have a background propagated to us,
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// in which case GetStyleBackground wouldn't have the right background
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// and the code in nsFrame::DisplayBorderBackgroundOutline might not give us
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// a background.
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// We don't have any border or outline, and our background draws over
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// the overflow area, so just add nsDisplayCanvasBackground instead of
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// calling DisplayBorderBackgroundOutline.
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if (IsVisibleForPainting(aBuilder)) {
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rv = aLists.BorderBackground()->AppendNewToTop(new (aBuilder)
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nsDisplayCanvasBackground(this));
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NS_ENSURE_SUCCESS(rv, rv);
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}
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nsIFrame* kid = GetFirstChild(nsnull);
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if (kid) {
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// Put our child into its own pseudo-stack.
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rv = BuildDisplayListForChild(aBuilder, kid, aDirtyRect, aLists,
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DISPLAY_CHILD_FORCE_PSEUDO_STACKING_CONTEXT);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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#ifdef DEBUG_CANVAS_FOCUS
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nsCOMPtr<nsIContent> focusContent;
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aPresContext->EventStateManager()->
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GetFocusedContent(getter_AddRefs(focusContent));
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PRBool hasFocus = PR_FALSE;
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nsCOMPtr<nsISupports> container;
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aPresContext->GetContainer(getter_AddRefs(container));
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nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(container));
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if (docShell) {
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docShell->GetHasFocus(&hasFocus);
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printf("%p - CanvasFrame::Paint R:%d,%d,%d,%d DR: %d,%d,%d,%d\n", this,
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mRect.x, mRect.y, mRect.width, mRect.height,
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aDirtyRect.x, aDirtyRect.y, aDirtyRect.width, aDirtyRect.height);
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}
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printf("%p - Focus: %s c: %p DoPaint:%s\n", docShell.get(), hasFocus?"Y":"N",
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focusContent.get(), mDoPaintFocus?"Y":"N");
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#endif
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if (!mDoPaintFocus)
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return NS_OK;
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// Only paint the focus if we're visible
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if (!GetStyleVisibility()->IsVisible())
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return NS_OK;
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return aLists.Outlines()->AppendNewToTop(new (aBuilder)
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nsDisplayCanvasFocus(this));
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}
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void
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CanvasFrame::PaintFocus(nsIRenderingContext& aRenderingContext, nsPoint aPt)
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{
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nsRect focusRect(aPt, GetSize());
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nsIScrollableFrame *scrollableFrame;
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CallQueryInterface(GetParent(), &scrollableFrame);
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if (scrollableFrame) {
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nsIScrollableView* scrollableView = scrollableFrame->GetScrollableView();
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nsRect vcr = scrollableView->View()->GetBounds();
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focusRect.width = vcr.width;
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focusRect.height = vcr.height;
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nscoord x,y;
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scrollableView->GetScrollPosition(x, y);
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focusRect.x += x;
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focusRect.y += y;
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}
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nsStyleOutline outlineStyle(GetPresContext());
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outlineStyle.SetOutlineStyle(NS_STYLE_BORDER_STYLE_DOTTED);
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outlineStyle.SetOutlineInitialColor();
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// XXX use the root frame foreground color, but should we find BODY frame
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// for HTML documents?
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nsIFrame* root = mFrames.FirstChild();
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const nsStyleColor* color =
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root ? root->GetStyleContext()->GetStyleColor() :
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mStyleContext->GetStyleColor();
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if (!color) {
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NS_ERROR("current color cannot be found");
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return;
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}
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// XXX the CSS border for links is specified as 2px, but it
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// is only drawn as 1px. Match this here.
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nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
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|
|
nsRect borderInside(focusRect.x + onePixel,
|
|
focusRect.y + onePixel,
|
|
focusRect.width - 2 * onePixel,
|
|
focusRect.height - 2 * onePixel);
|
|
|
|
nsCSSRendering::DrawDashedSides(0, aRenderingContext,
|
|
focusRect, color,
|
|
nsnull, &outlineStyle,
|
|
PR_TRUE, focusRect,
|
|
borderInside, 0,
|
|
nsnull);
|
|
}
|
|
|
|
/* virtual */ nscoord
|
|
CanvasFrame::GetMinWidth(nsIRenderingContext *aRenderingContext)
|
|
{
|
|
nscoord result;
|
|
DISPLAY_MIN_WIDTH(this, result);
|
|
if (mFrames.IsEmpty())
|
|
result = 0;
|
|
else
|
|
result = mFrames.FirstChild()->GetMinWidth(aRenderingContext);
|
|
return result;
|
|
}
|
|
|
|
/* virtual */ nscoord
|
|
CanvasFrame::GetPrefWidth(nsIRenderingContext *aRenderingContext)
|
|
{
|
|
nscoord result;
|
|
DISPLAY_PREF_WIDTH(this, result);
|
|
if (mFrames.IsEmpty())
|
|
result = 0;
|
|
else
|
|
result = mFrames.FirstChild()->GetPrefWidth(aRenderingContext);
|
|
return result;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
CanvasFrame::Reflow(nsPresContext* aPresContext,
|
|
nsHTMLReflowMetrics& aDesiredSize,
|
|
const nsHTMLReflowState& aReflowState,
|
|
nsReflowStatus& aStatus)
|
|
{
|
|
DO_GLOBAL_REFLOW_COUNT("CanvasFrame");
|
|
DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
|
|
NS_FRAME_TRACE_REFLOW_IN("CanvasFrame::Reflow");
|
|
|
|
// Initialize OUT parameter
|
|
aStatus = NS_FRAME_COMPLETE;
|
|
|
|
// Reflow our one and only child frame
|
|
nsHTMLReflowMetrics kidDesiredSize;
|
|
if (mFrames.IsEmpty()) {
|
|
// We have no child frame, so return an empty size
|
|
aDesiredSize.width = aDesiredSize.height = 0;
|
|
} else {
|
|
nsIFrame* kidFrame = mFrames.FirstChild();
|
|
PRBool kidDirty = (kidFrame->GetStateBits() & NS_FRAME_IS_DIRTY) != 0;
|
|
|
|
// We must specify an unconstrained available height, because constrained
|
|
// is only for when we're paginated...
|
|
nsHTMLReflowState kidReflowState(aPresContext, aReflowState, kidFrame,
|
|
nsSize(aReflowState.availableWidth,
|
|
NS_UNCONSTRAINEDSIZE));
|
|
|
|
// Reflow the frame
|
|
ReflowChild(kidFrame, aPresContext, kidDesiredSize, kidReflowState,
|
|
kidReflowState.mComputedMargin.left, kidReflowState.mComputedMargin.top,
|
|
0, aStatus);
|
|
|
|
// Complete the reflow and position and size the child frame
|
|
FinishReflowChild(kidFrame, aPresContext, &kidReflowState, kidDesiredSize,
|
|
kidReflowState.mComputedMargin.left,
|
|
kidReflowState.mComputedMargin.top, 0);
|
|
|
|
// If the child frame was just inserted, then we're responsible for making sure
|
|
// it repaints
|
|
if (kidDirty) {
|
|
// But we have a new child, which will affect our background, so
|
|
// invalidate our whole rect.
|
|
// Note: Even though we request to be sized to our child's size, our
|
|
// scroll frame ensures that we are always the size of the viewport.
|
|
// Also note: GetPosition() on a CanvasFrame is always going to return
|
|
// (0, 0). We only want to invalidate GetRect() since GetOverflowRect()
|
|
// could also include overflow to our top and left (out of the viewport)
|
|
// which doesn't need to be painted.
|
|
Invalidate(GetRect(), PR_FALSE);
|
|
}
|
|
|
|
// Return our desired size (which doesn't matter)
|
|
aDesiredSize.width = aReflowState.availableWidth;
|
|
aDesiredSize.height = kidDesiredSize.height +
|
|
kidReflowState.mComputedMargin.TopBottom();
|
|
|
|
aDesiredSize.mOverflowArea.UnionRect(
|
|
nsRect(0, 0, aDesiredSize.width, aDesiredSize.height),
|
|
kidDesiredSize.mOverflowArea +
|
|
nsPoint(kidReflowState.mComputedMargin.left,
|
|
kidReflowState.mComputedMargin.top));
|
|
FinishAndStoreOverflow(&aDesiredSize);
|
|
}
|
|
|
|
NS_FRAME_TRACE_REFLOW_OUT("CanvasFrame::Reflow", aStatus);
|
|
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
|
|
return NS_OK;
|
|
}
|
|
|
|
PRIntn
|
|
CanvasFrame::GetSkipSides() const
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
nsIAtom*
|
|
CanvasFrame::GetType() const
|
|
{
|
|
return nsGkAtoms::canvasFrame;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
CanvasFrame::GetContentForEvent(nsPresContext* aPresContext,
|
|
nsEvent* aEvent,
|
|
nsIContent** aContent)
|
|
{
|
|
NS_ENSURE_ARG_POINTER(aContent);
|
|
nsresult rv = nsFrame::GetContentForEvent(aPresContext,
|
|
aEvent,
|
|
aContent);
|
|
if (NS_FAILED(rv) || !*aContent) {
|
|
nsIFrame* kid = mFrames.FirstChild();
|
|
if (kid) {
|
|
rv = kid->GetContentForEvent(aPresContext,
|
|
aEvent,
|
|
aContent);
|
|
}
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
NS_IMETHODIMP
|
|
CanvasFrame::GetFrameName(nsAString& aResult) const
|
|
{
|
|
return MakeFrameName(NS_LITERAL_STRING("Canvas"), aResult);
|
|
}
|
|
#endif
|