gecko/layout/generic/nsPlaceholderFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2012-05-21 04:12:37 -07:00
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* 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 "nsRenderingContext.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(nsRenderingContext *aRenderingContext)
{
nscoord result = 0;
DISPLAY_MIN_WIDTH(this, result);
return result;
}
/* virtual */ nscoord
nsPlaceholderFrame::GetPrefWidth(nsRenderingContext *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(nsRenderingContext *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()->IsFloating())
aData->floats.AppendElement(mOutOfFlowFrame);
}
/* virtual */ void
nsPlaceholderFrame::AddInlinePrefWidth(nsRenderingContext *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()->IsFloating())
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) {
oof->InvalidateFrameSubtree();
// 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))) {
ChildListID listId = nsLayoutUtils::GetChildListNameFor(oof);
shell->FrameManager()->RemoveFrame(listId, oof, false);
}
// else oof will be destroyed by its parent
}
nsFrame::DestroyFrom(aDestructRoot);
}
nsIAtom*
nsPlaceholderFrame::GetType() const
{
return nsGkAtoms::placeholderFrame;
}
/* virtual */ bool
nsPlaceholderFrame::CanContinueTextRun() const
{
if (!mOutOfFlowFrame) {
return false;
}
// first-letter frames can continue text runs, and placeholders for floated
// first-letter frames can too
return mOutOfFlowFrame->CanContinueTextRun();
}
nsIFrame*
nsPlaceholderFrame::GetParentStyleContextFrame() const
{
NS_PRECONDITION(GetParent(), "How can we not have a parent here?");
// 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.
return CorrectStyleParentFrame(GetParent(), nsGkAtoms::placeholderFrame);
}
#ifdef DEBUG
static void
PaintDebugPlaceholder(nsIFrame* aFrame, nsRenderingContext* 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]", (unsigned long long)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