gecko-dev/layout/generic/nsPlaceholderFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Mats Palmgren <mats.palmgren@bredband.net>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* rendering object for the point that anchors out-of-flow rendering
* objects such as floats and absolutely positioned elements
*/
#include "nsLayoutUtils.h"
#include "nsPlaceholderFrame.h"
#include "nsLineLayout.h"
#include "nsIContent.h"
#include "nsPresContext.h"
#include "nsIRenderingContext.h"
#include "nsGkAtoms.h"
#include "nsFrameManager.h"
#include "nsDisplayList.h"
nsIFrame*
NS_NewPlaceholderFrame(nsIPresShell* aPresShell, nsStyleContext* aContext,
nsFrameState aTypeBit)
{
return new (aPresShell) nsPlaceholderFrame(aContext, aTypeBit);
}
NS_IMPL_FRAMEARENA_HELPERS(nsPlaceholderFrame)
nsPlaceholderFrame::~nsPlaceholderFrame()
{
}
/* virtual */ nscoord
nsPlaceholderFrame::GetMinWidth(nsIRenderingContext *aRenderingContext)
{
nscoord result = 0;
DISPLAY_MIN_WIDTH(this, result);
return result;
}
/* virtual */ nscoord
nsPlaceholderFrame::GetPrefWidth(nsIRenderingContext *aRenderingContext)
{
nscoord result = 0;
DISPLAY_PREF_WIDTH(this, result);
return result;
}
/* virtual */ nsSize
nsPlaceholderFrame::GetMinSize(nsBoxLayoutState& aBoxLayoutState)
{
nsSize size(0, 0);
DISPLAY_MIN_SIZE(this, size);
return size;
}
/* virtual */ nsSize
nsPlaceholderFrame::GetPrefSize(nsBoxLayoutState& aBoxLayoutState)
{
nsSize size(0, 0);
DISPLAY_PREF_SIZE(this, size);
return size;
}
/* virtual */ nsSize
nsPlaceholderFrame::GetMaxSize(nsBoxLayoutState& aBoxLayoutState)
{
nsSize size(NS_INTRINSICSIZE, NS_INTRINSICSIZE);
DISPLAY_MAX_SIZE(this, size);
return size;
}
/* virtual */ void
nsPlaceholderFrame::AddInlineMinWidth(nsIRenderingContext *aRenderingContext,
nsIFrame::InlineMinWidthData *aData)
{
// Override AddInlineMinWith so that *nothing* happens. In
// particular, we don't want to zero out |aData->trailingWhitespace|,
// since nsLineLayout skips placeholders when trimming trailing
// whitespace, and we don't want to set aData->skipWhitespace to
// false.
// ...but push floats onto the list
if (mOutOfFlowFrame->GetStyleDisplay()->mFloats != NS_STYLE_FLOAT_NONE)
aData->floats.AppendElement(mOutOfFlowFrame);
}
/* virtual */ void
nsPlaceholderFrame::AddInlinePrefWidth(nsIRenderingContext *aRenderingContext,
nsIFrame::InlinePrefWidthData *aData)
{
// Override AddInlinePrefWith so that *nothing* happens. In
// particular, we don't want to zero out |aData->trailingWhitespace|,
// since nsLineLayout skips placeholders when trimming trailing
// whitespace, and we don't want to set aData->skipWhitespace to
// false.
// ...but push floats onto the list
if (mOutOfFlowFrame->GetStyleDisplay()->mFloats != NS_STYLE_FLOAT_NONE)
aData->floats.AppendElement(mOutOfFlowFrame);
}
NS_IMETHODIMP
nsPlaceholderFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsPlaceholderFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
aDesiredSize.width = 0;
aDesiredSize.height = 0;
aStatus = NS_FRAME_COMPLETE;
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
return NS_OK;
}
void
nsPlaceholderFrame::DestroyFrom(nsIFrame* aDestructRoot)
{
nsIPresShell* shell = PresContext()->GetPresShell();
nsIFrame* oof = mOutOfFlowFrame;
if (oof) {
// Unregister out-of-flow frame
shell->FrameManager()->UnregisterPlaceholderFrame(this);
mOutOfFlowFrame = nsnull;
// If aDestructRoot is not an ancestor of the out-of-flow frame,
// then call RemoveFrame on it here.
// Also destroy it here if it's a popup frame. (Bug 96291)
if (shell->FrameManager() &&
((GetStateBits() & PLACEHOLDER_FOR_POPUP) ||
!nsLayoutUtils::IsProperAncestorFrame(aDestructRoot, oof))) {
nsIAtom* listName = nsLayoutUtils::GetChildListNameFor(oof);
shell->FrameManager()->RemoveFrame(listName, oof);
}
// else oof will be destroyed by its parent
}
nsFrame::DestroyFrom(aDestructRoot);
}
nsIAtom*
nsPlaceholderFrame::GetType() const
{
return nsGkAtoms::placeholderFrame;
}
/* virtual */ PRBool
nsPlaceholderFrame::CanContinueTextRun() const
{
if (!mOutOfFlowFrame) {
return PR_FALSE;
}
// first-letter frames can continue text runs, and placeholders for floated
// first-letter frames can too
return mOutOfFlowFrame->CanContinueTextRun();
}
NS_IMETHODIMP
nsPlaceholderFrame::GetParentStyleContextFrame(nsPresContext* aPresContext,
nsIFrame** aProviderFrame,
PRBool* aIsChild)
{
NS_PRECONDITION(GetParent(), "How can we not have a parent here?");
*aIsChild = PR_FALSE;
// Lie about our pseudo so we can step out of all anon boxes and
// pseudo-elements. The other option would be to reimplement the
// {ib} split gunk here.
*aProviderFrame =
CorrectStyleParentFrame(GetParent(), nsGkAtoms::placeholderFrame);
return NS_OK;
}
#ifdef DEBUG
static void
PaintDebugPlaceholder(nsIFrame* aFrame, nsIRenderingContext* aCtx,
const nsRect& aDirtyRect, nsPoint aPt)
{
aCtx->SetColor(NS_RGB(0, 255, 255));
nscoord x = nsPresContext::CSSPixelsToAppUnits(-5);
aCtx->FillRect(aPt.x + x, aPt.y,
nsPresContext::CSSPixelsToAppUnits(13), nsPresContext::CSSPixelsToAppUnits(3));
nscoord y = nsPresContext::CSSPixelsToAppUnits(-10);
aCtx->FillRect(aPt.x, aPt.y + y,
nsPresContext::CSSPixelsToAppUnits(3), nsPresContext::CSSPixelsToAppUnits(10));
}
#endif // DEBUG
#if defined(DEBUG) || (defined(MOZ_REFLOW_PERF_DSP) && defined(MOZ_REFLOW_PERF))
NS_IMETHODIMP
nsPlaceholderFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
DO_GLOBAL_REFLOW_COUNT_DSP("nsPlaceholderFrame");
#ifdef DEBUG
if (!GetShowFrameBorders())
return NS_OK;
return aLists.Outlines()->AppendNewToTop(new (aBuilder)
nsDisplayGeneric(aBuilder, this, PaintDebugPlaceholder, "DebugPlaceholder",
nsDisplayItem::TYPE_DEBUG_PLACEHOLDER));
#else // DEBUG
return NS_OK;
#endif // DEBUG
}
#endif // DEBUG || (MOZ_REFLOW_PERF_DSP && MOZ_REFLOW_PERF)
#ifdef DEBUG
NS_IMETHODIMP
nsPlaceholderFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("Placeholder"), aResult);
}
NS_IMETHODIMP
nsPlaceholderFrame::List(FILE* out, PRInt32 aIndent) const
{
IndentBy(out, aIndent);
ListTag(out);
#ifdef DEBUG_waterson
fprintf(out, " [parent=%p]", static_cast<void*>(mParent));
#endif
if (HasView()) {
fprintf(out, " [view=%p]", (void*)GetView());
}
fprintf(out, " {%d,%d,%d,%d}", mRect.x, mRect.y, mRect.width, mRect.height);
if (0 != mState) {
fprintf(out, " [state=%016llx]", mState);
}
nsIFrame* prevInFlow = GetPrevInFlow();
nsIFrame* nextInFlow = GetNextInFlow();
if (nsnull != prevInFlow) {
fprintf(out, " prev-in-flow=%p", static_cast<void*>(prevInFlow));
}
if (nsnull != nextInFlow) {
fprintf(out, " next-in-flow=%p", static_cast<void*>(nextInFlow));
}
if (nsnull != mContent) {
fprintf(out, " [content=%p]", static_cast<void*>(mContent));
}
if (nsnull != mStyleContext) {
fprintf(out, " [sc=%p]", static_cast<void*>(mStyleContext));
}
if (mOutOfFlowFrame) {
fprintf(out, " outOfFlowFrame=");
nsFrame::ListTag(out, mOutOfFlowFrame);
}
fputs("\n", out);
return NS_OK;
}
#endif