зеркало из https://github.com/mozilla/pjs.git
292 строки
9.4 KiB
C++
292 строки
9.4 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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* Mats Palmgren <mats.palmgren@bredband.net>
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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 for the point that anchors out-of-flow rendering
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* objects such as floats and absolutely positioned elements
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*/
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#include "nsLayoutUtils.h"
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#include "nsPlaceholderFrame.h"
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#include "nsLineLayout.h"
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#include "nsIContent.h"
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#include "nsPresContext.h"
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#include "nsIRenderingContext.h"
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#include "nsGkAtoms.h"
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#include "nsFrameManager.h"
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#include "nsDisplayList.h"
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nsIFrame*
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NS_NewPlaceholderFrame(nsIPresShell* aPresShell, nsStyleContext* aContext,
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nsFrameState aTypeBit)
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{
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return new (aPresShell) nsPlaceholderFrame(aContext, aTypeBit);
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsPlaceholderFrame)
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nsPlaceholderFrame::~nsPlaceholderFrame()
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{
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}
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/* virtual */ nscoord
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nsPlaceholderFrame::GetMinWidth(nsIRenderingContext *aRenderingContext)
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{
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nscoord result = 0;
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DISPLAY_MIN_WIDTH(this, result);
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return result;
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}
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/* virtual */ nscoord
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nsPlaceholderFrame::GetPrefWidth(nsIRenderingContext *aRenderingContext)
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{
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nscoord result = 0;
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DISPLAY_PREF_WIDTH(this, result);
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return result;
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}
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/* virtual */ nsSize
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nsPlaceholderFrame::GetMinSize(nsBoxLayoutState& aBoxLayoutState)
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{
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nsSize size(0, 0);
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DISPLAY_MIN_SIZE(this, size);
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return size;
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}
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/* virtual */ nsSize
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nsPlaceholderFrame::GetPrefSize(nsBoxLayoutState& aBoxLayoutState)
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{
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nsSize size(0, 0);
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DISPLAY_PREF_SIZE(this, size);
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return size;
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}
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/* virtual */ nsSize
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nsPlaceholderFrame::GetMaxSize(nsBoxLayoutState& aBoxLayoutState)
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{
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nsSize size(NS_INTRINSICSIZE, NS_INTRINSICSIZE);
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DISPLAY_MAX_SIZE(this, size);
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return size;
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}
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/* virtual */ void
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nsPlaceholderFrame::AddInlineMinWidth(nsIRenderingContext *aRenderingContext,
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nsIFrame::InlineMinWidthData *aData)
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{
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// Override AddInlineMinWith so that *nothing* happens. In
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// particular, we don't want to zero out |aData->trailingWhitespace|,
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// since nsLineLayout skips placeholders when trimming trailing
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// whitespace, and we don't want to set aData->skipWhitespace to
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// false.
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// ...but push floats onto the list
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if (mOutOfFlowFrame->GetStyleDisplay()->mFloats != NS_STYLE_FLOAT_NONE)
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aData->floats.AppendElement(mOutOfFlowFrame);
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}
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/* virtual */ void
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nsPlaceholderFrame::AddInlinePrefWidth(nsIRenderingContext *aRenderingContext,
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nsIFrame::InlinePrefWidthData *aData)
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{
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// Override AddInlinePrefWith so that *nothing* happens. In
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// particular, we don't want to zero out |aData->trailingWhitespace|,
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// since nsLineLayout skips placeholders when trimming trailing
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// whitespace, and we don't want to set aData->skipWhitespace to
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// false.
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// ...but push floats onto the list
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if (mOutOfFlowFrame->GetStyleDisplay()->mFloats != NS_STYLE_FLOAT_NONE)
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aData->floats.AppendElement(mOutOfFlowFrame);
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}
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NS_IMETHODIMP
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nsPlaceholderFrame::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("nsPlaceholderFrame");
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DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
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aDesiredSize.width = 0;
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aDesiredSize.height = 0;
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aStatus = NS_FRAME_COMPLETE;
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NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
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return NS_OK;
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}
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void
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nsPlaceholderFrame::DestroyFrom(nsIFrame* aDestructRoot)
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{
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nsIPresShell* shell = PresContext()->GetPresShell();
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nsIFrame* oof = mOutOfFlowFrame;
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if (oof) {
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// Unregister out-of-flow frame
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shell->FrameManager()->UnregisterPlaceholderFrame(this);
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mOutOfFlowFrame = nsnull;
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// If aDestructRoot is not an ancestor of the out-of-flow frame,
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// then call RemoveFrame on it here.
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// Also destroy it here if it's a popup frame. (Bug 96291)
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if (shell->FrameManager() &&
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((GetStateBits() & PLACEHOLDER_FOR_POPUP) ||
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!nsLayoutUtils::IsProperAncestorFrame(aDestructRoot, oof))) {
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nsIAtom* listName = nsLayoutUtils::GetChildListNameFor(oof);
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shell->FrameManager()->RemoveFrame(listName, oof);
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}
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// else oof will be destroyed by its parent
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}
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nsFrame::DestroyFrom(aDestructRoot);
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}
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nsIAtom*
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nsPlaceholderFrame::GetType() const
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{
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return nsGkAtoms::placeholderFrame;
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}
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/* virtual */ PRBool
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nsPlaceholderFrame::CanContinueTextRun() const
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{
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if (!mOutOfFlowFrame) {
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return PR_FALSE;
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}
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// first-letter frames can continue text runs, and placeholders for floated
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// first-letter frames can too
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return mOutOfFlowFrame->CanContinueTextRun();
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}
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NS_IMETHODIMP
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nsPlaceholderFrame::GetParentStyleContextFrame(nsPresContext* aPresContext,
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nsIFrame** aProviderFrame,
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PRBool* aIsChild)
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{
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NS_PRECONDITION(GetParent(), "How can we not have a parent here?");
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*aIsChild = PR_FALSE;
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// Lie about our pseudo so we can step out of all anon boxes and
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// pseudo-elements. The other option would be to reimplement the
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// {ib} split gunk here.
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*aProviderFrame =
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CorrectStyleParentFrame(GetParent(), nsGkAtoms::placeholderFrame);
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return NS_OK;
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}
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#ifdef DEBUG
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static void
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PaintDebugPlaceholder(nsIFrame* aFrame, nsIRenderingContext* aCtx,
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const nsRect& aDirtyRect, nsPoint aPt)
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{
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aCtx->SetColor(NS_RGB(0, 255, 255));
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nscoord x = nsPresContext::CSSPixelsToAppUnits(-5);
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aCtx->FillRect(aPt.x + x, aPt.y,
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nsPresContext::CSSPixelsToAppUnits(13), nsPresContext::CSSPixelsToAppUnits(3));
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nscoord y = nsPresContext::CSSPixelsToAppUnits(-10);
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aCtx->FillRect(aPt.x, aPt.y + y,
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nsPresContext::CSSPixelsToAppUnits(3), nsPresContext::CSSPixelsToAppUnits(10));
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}
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#endif // DEBUG
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#if defined(DEBUG) || (defined(MOZ_REFLOW_PERF_DSP) && defined(MOZ_REFLOW_PERF))
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NS_IMETHODIMP
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nsPlaceholderFrame::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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DO_GLOBAL_REFLOW_COUNT_DSP("nsPlaceholderFrame");
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#ifdef DEBUG
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if (!GetShowFrameBorders())
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return NS_OK;
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return aLists.Outlines()->AppendNewToTop(new (aBuilder)
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nsDisplayGeneric(aBuilder, this, PaintDebugPlaceholder, "DebugPlaceholder",
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nsDisplayItem::TYPE_DEBUG_PLACEHOLDER));
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#else // DEBUG
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return NS_OK;
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#endif // DEBUG
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}
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#endif // DEBUG || (MOZ_REFLOW_PERF_DSP && MOZ_REFLOW_PERF)
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#ifdef DEBUG
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NS_IMETHODIMP
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nsPlaceholderFrame::GetFrameName(nsAString& aResult) const
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{
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return MakeFrameName(NS_LITERAL_STRING("Placeholder"), aResult);
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}
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NS_IMETHODIMP
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nsPlaceholderFrame::List(FILE* out, PRInt32 aIndent) const
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{
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IndentBy(out, aIndent);
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ListTag(out);
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#ifdef DEBUG_waterson
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fprintf(out, " [parent=%p]", static_cast<void*>(mParent));
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#endif
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if (HasView()) {
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fprintf(out, " [view=%p]", (void*)GetView());
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}
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fprintf(out, " {%d,%d,%d,%d}", mRect.x, mRect.y, mRect.width, mRect.height);
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if (0 != mState) {
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fprintf(out, " [state=%016llx]", mState);
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}
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nsIFrame* prevInFlow = GetPrevInFlow();
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nsIFrame* nextInFlow = GetNextInFlow();
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if (nsnull != prevInFlow) {
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fprintf(out, " prev-in-flow=%p", static_cast<void*>(prevInFlow));
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}
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if (nsnull != nextInFlow) {
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fprintf(out, " next-in-flow=%p", static_cast<void*>(nextInFlow));
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}
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if (nsnull != mContent) {
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fprintf(out, " [content=%p]", static_cast<void*>(mContent));
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}
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if (nsnull != mStyleContext) {
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fprintf(out, " [sc=%p]", static_cast<void*>(mStyleContext));
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}
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if (mOutOfFlowFrame) {
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fprintf(out, " outOfFlowFrame=");
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nsFrame::ListTag(out, mOutOfFlowFrame);
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}
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fputs("\n", out);
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return NS_OK;
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}
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#endif
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