зеркало из https://github.com/mozilla/pjs.git
372 строки
12 KiB
C++
372 строки
12 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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/*
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* rendering object that is the root of the frame tree, which contains
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* the document's scrollbars and contains fixed-positioned elements
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*/
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#include "nsCOMPtr.h"
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#include "nsViewportFrame.h"
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#include "nsHTMLParts.h"
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#include "nsGkAtoms.h"
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#include "nsIScrollableFrame.h"
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#include "nsDisplayList.h"
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nsIFrame*
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NS_NewViewportFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
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return new (aPresShell) ViewportFrame(aContext);
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}
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NS_IMETHODIMP
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ViewportFrame::Init(nsIContent* aContent,
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nsIFrame* aParent,
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nsIFrame* aPrevInFlow)
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{
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return Super::Init(aContent, aParent, aPrevInFlow);
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}
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void
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ViewportFrame::Destroy()
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{
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mFixedContainer.DestroyFrames(this);
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nsContainerFrame::Destroy();
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}
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NS_IMETHODIMP
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ViewportFrame::SetInitialChildList(nsIAtom* aListName,
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nsIFrame* aChildList)
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{
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nsresult rv = NS_OK;
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// See which child list to add the frames to
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#ifdef NS_DEBUG
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nsFrame::VerifyDirtyBitSet(aChildList);
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#endif
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if (nsGkAtoms::fixedList == aListName) {
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rv = mFixedContainer.SetInitialChildList(this, aListName, aChildList);
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}
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else {
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rv = nsContainerFrame::SetInitialChildList(aListName, aChildList);
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}
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return rv;
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}
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NS_IMETHODIMP
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ViewportFrame::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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// We don't need any special painting or event handling. We just need to
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// mark our visible out-of-flow frames (i.e., the fixed position frames) so
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// that display list construction is guaranteed to recurse into their
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// ancestors.
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aBuilder->MarkFramesForDisplayList(this, mFixedContainer.GetFirstChild(), aDirtyRect);
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nsIFrame* kid = mFrames.FirstChild();
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if (!kid)
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return NS_OK;
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// make the kid's BorderBackground our own. This ensures that the canvas
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// frame's background becomes our own background and therefore appears
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// below negative z-index elements.
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return BuildDisplayListForChild(aBuilder, kid, aDirtyRect, aLists);
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}
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NS_IMETHODIMP
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ViewportFrame::AppendFrames(nsIAtom* aListName,
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nsIFrame* aFrameList)
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{
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nsresult rv = NS_OK;
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if (nsGkAtoms::fixedList == aListName) {
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rv = mFixedContainer.AppendFrames(this, aListName, aFrameList);
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}
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else {
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// We only expect incremental changes for our fixed frames
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NS_ERROR("unexpected child list");
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rv = NS_ERROR_INVALID_ARG;
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}
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return rv;
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}
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NS_IMETHODIMP
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ViewportFrame::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 = NS_OK;
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if (nsGkAtoms::fixedList == aListName) {
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rv = mFixedContainer.InsertFrames(this, aListName, aPrevFrame, aFrameList);
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}
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else {
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// We only expect incremental changes for our fixed frames
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NS_ERROR("unexpected child list");
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rv = NS_ERROR_INVALID_ARG;
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}
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return rv;
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}
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NS_IMETHODIMP
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ViewportFrame::RemoveFrame(nsIAtom* aListName,
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nsIFrame* aOldFrame)
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{
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nsresult rv = NS_OK;
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if (nsGkAtoms::fixedList == aListName) {
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rv = mFixedContainer.RemoveFrame(this, aListName, aOldFrame);
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}
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else {
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// We only expect incremental changes for our fixed frames
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NS_ERROR("unexpected child list");
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rv = NS_ERROR_INVALID_ARG;
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}
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return rv;
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}
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nsIAtom*
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ViewportFrame::GetAdditionalChildListName(PRInt32 aIndex) const
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{
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NS_PRECONDITION(aIndex >= 0, "illegal index");
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if (0 == aIndex) {
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return nsGkAtoms::fixedList;
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}
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return nsnull;
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}
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nsIFrame*
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ViewportFrame::GetFirstChild(nsIAtom* aListName) const
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{
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if (nsGkAtoms::fixedList == aListName) {
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nsIFrame* result = nsnull;
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mFixedContainer.FirstChild(this, aListName, &result);
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return result;
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}
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return nsContainerFrame::GetFirstChild(aListName);
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}
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/* virtual */ nscoord
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ViewportFrame::GetMinWidth(nsIRenderingContext *aRenderingContext)
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{
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nscoord result;
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DISPLAY_MIN_WIDTH(this, result);
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if (mFrames.IsEmpty())
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result = 0;
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else
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result = mFrames.FirstChild()->GetMinWidth(aRenderingContext);
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// XXXldb Deal with mFixedContainer (matters for SizeToContent)!
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return result;
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}
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/* virtual */ nscoord
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ViewportFrame::GetPrefWidth(nsIRenderingContext *aRenderingContext)
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{
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nscoord result;
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DISPLAY_PREF_WIDTH(this, result);
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if (mFrames.IsEmpty())
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result = 0;
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else
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result = mFrames.FirstChild()->GetPrefWidth(aRenderingContext);
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// XXXldb Deal with mFixedContainer (matters for SizeToContent)!
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return result;
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}
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nsPoint
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ViewportFrame::AdjustReflowStateForScrollbars(nsHTMLReflowState* aReflowState) const
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{
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// Calculate how much room is available for fixed frames. That means
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// determining if the viewport is scrollable and whether the vertical and/or
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// horizontal scrollbars are visible
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// Get our prinicpal child frame and see if we're scrollable
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nsIFrame* kidFrame = mFrames.FirstChild();
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nsCOMPtr<nsIScrollableFrame> scrollingFrame(do_QueryInterface(kidFrame));
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if (scrollingFrame) {
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nsMargin scrollbars = scrollingFrame->GetActualScrollbarSizes();
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aReflowState->SetComputedWidth(aReflowState->ComputedWidth() -
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scrollbars.LeftRight());
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aReflowState->availableWidth -= scrollbars.LeftRight();
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aReflowState->SetComputedHeight(aReflowState->ComputedHeight() -
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scrollbars.TopBottom());
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// XXX why don't we also adjust "aReflowState->availableHeight"?
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return nsPoint(scrollbars.left, scrollbars.top);
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}
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return nsPoint(0, 0);
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}
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NS_IMETHODIMP
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ViewportFrame::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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{
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DO_GLOBAL_REFLOW_COUNT("ViewportFrame");
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DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
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NS_FRAME_TRACE_REFLOW_IN("ViewportFrame::Reflow");
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// Initialize OUT parameters
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aStatus = NS_FRAME_COMPLETE;
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// Because |Reflow| sets mComputedHeight on the child to
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// availableHeight.
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AddStateBits(NS_FRAME_CONTAINS_RELATIVE_HEIGHT);
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// Reflow the main content first so that the placeholders of the
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// fixed-position frames will be in the right places on an initial
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// reflow.
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nsRect kidRect(0,0,aReflowState.availableWidth,aReflowState.availableHeight);
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nsresult rv = NS_OK;
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if (mFrames.NotEmpty()) {
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// Deal with a non-incremental reflow or an incremental reflow
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// targeted at our one-and-only principal child frame.
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if (aReflowState.ShouldReflowAllKids() ||
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aReflowState.mFlags.mVResize ||
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NS_SUBTREE_DIRTY(mFrames.FirstChild())) {
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// Reflow our one-and-only principal child frame
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nsIFrame* kidFrame = mFrames.FirstChild();
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nsHTMLReflowMetrics kidDesiredSize;
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nsSize availableSpace(aReflowState.availableWidth,
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aReflowState.availableHeight);
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nsHTMLReflowState kidReflowState(aPresContext, aReflowState,
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kidFrame, availableSpace);
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// Reflow the frame
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kidReflowState.SetComputedHeight(aReflowState.availableHeight);
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rv = ReflowChild(kidFrame, aPresContext, kidDesiredSize, kidReflowState,
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0, 0, 0, aStatus);
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kidRect.width = kidDesiredSize.width;
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kidRect.height = kidDesiredSize.height;
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FinishReflowChild(kidFrame, aPresContext, nsnull, kidDesiredSize, 0, 0, 0);
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}
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}
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NS_ASSERTION(aReflowState.availableWidth != NS_UNCONSTRAINEDSIZE,
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"shouldn't happen anymore");
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// Return the max size as our desired size
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aDesiredSize.width = aReflowState.availableWidth;
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// Being flowed initially at an unconstrained height means we should
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// return our child's intrinsic size.
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aDesiredSize.height = aReflowState.availableHeight != NS_UNCONSTRAINEDSIZE
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? aReflowState.availableHeight
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: kidRect.height;
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// Make a copy of the reflow state and change the computed width and height
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// to reflect the available space for the fixed items
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nsHTMLReflowState reflowState(aReflowState);
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nsPoint offset = AdjustReflowStateForScrollbars(&reflowState);
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#ifdef DEBUG
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nsIFrame* f;
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mFixedContainer.FirstChild(this, nsGkAtoms::fixedList, &f);
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NS_ASSERTION(!f || (offset.x == 0 && offset.y == 0),
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"We don't handle correct positioning of fixed frames with "
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"scrollbars in odd positions");
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#endif
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// Just reflow all the fixed-pos frames.
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rv = mFixedContainer.Reflow(this, aPresContext, reflowState,
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reflowState.ComputedWidth(),
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reflowState.ComputedHeight(),
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PR_TRUE, PR_TRUE); // XXX could be optimized
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// If we were dirty then do a repaint
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if (GetStateBits() & NS_FRAME_IS_DIRTY) {
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nsRect damageRect(0, 0, aDesiredSize.width, aDesiredSize.height);
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Invalidate(damageRect, PR_FALSE);
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}
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// XXX Should we do something to clip our children to this?
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aDesiredSize.mOverflowArea =
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nsRect(nsPoint(0, 0), nsSize(aDesiredSize.width, aDesiredSize.height));
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NS_FRAME_TRACE_REFLOW_OUT("ViewportFrame::Reflow", aStatus);
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NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
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return rv;
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}
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nsIAtom*
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ViewportFrame::GetType() const
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{
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return nsGkAtoms::viewportFrame;
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}
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/* virtual */ PRBool
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ViewportFrame::IsContainingBlock() const
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{
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return PR_TRUE;
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}
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void
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ViewportFrame::InvalidateInternal(const nsRect& aDamageRect,
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nscoord aX, nscoord aY, nsIFrame* aForChild,
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PRBool aImmediate)
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{
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nsIFrame* parent = nsLayoutUtils::GetCrossDocParentFrame(this);
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if (parent) {
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nsPoint pt = GetOffsetTo(parent);
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parent->InvalidateInternal(aDamageRect, aX + pt.x, aY + pt.y, this, aImmediate);
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return;
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}
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InvalidateRoot(aDamageRect, aX, aY, aImmediate);
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}
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#ifdef DEBUG
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NS_IMETHODIMP
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ViewportFrame::GetFrameName(nsAString& aResult) const
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{
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return MakeFrameName(NS_LITERAL_STRING("Viewport"), aResult);
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}
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#endif
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