gecko-dev/layout/generic/nsLeafFrame.cpp

119 строки
3.7 KiB
C++
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* 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/. */
/* base class for rendering objects that do not have child lists */
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#include "nsLeafFrame.h"
#include "nsPresContext.h"
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nsLeafFrame::~nsLeafFrame()
{
}
NS_IMPL_FRAMEARENA_HELPERS(nsLeafFrame)
/* virtual */ nscoord
nsLeafFrame::GetMinWidth(nsRenderingContext *aRenderingContext)
{
nscoord result;
DISPLAY_MIN_WIDTH(this, result);
result = GetIntrinsicWidth();
return result;
}
/* virtual */ nscoord
nsLeafFrame::GetPrefWidth(nsRenderingContext *aRenderingContext)
{
nscoord result;
DISPLAY_PREF_WIDTH(this, result);
result = GetIntrinsicWidth();
return result;
}
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/* virtual */ nsSize
nsLeafFrame::ComputeAutoSize(nsRenderingContext *aRenderingContext,
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nsSize aCBSize, nscoord aAvailableWidth,
nsSize aMargin, nsSize aBorder,
nsSize aPadding, bool aShrinkWrap)
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{
return nsSize(GetIntrinsicWidth(), GetIntrinsicHeight());
}
nsresult
nsLeafFrame::Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
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{
DO_GLOBAL_REFLOW_COUNT("nsLeafFrame");
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NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
("enter nsLeafFrame::Reflow: aMaxSize=%d,%d",
aReflowState.AvailableWidth(), aReflowState.AvailableHeight()));
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NS_PRECONDITION(mState & NS_FRAME_IN_REFLOW, "frame is not in reflow");
DoReflow(aPresContext, aMetrics, aReflowState, aStatus);
FinishAndStoreOverflow(&aMetrics);
return NS_OK;
}
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nsresult
nsLeafFrame::DoReflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
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NS_ASSERTION(aReflowState.ComputedWidth() != NS_UNCONSTRAINEDSIZE,
"Shouldn't have unconstrained stuff here "
"Thanks to the rules of reflow");
NS_ASSERTION(NS_INTRINSICSIZE != aReflowState.ComputedHeight(),
"Shouldn't have unconstrained stuff here "
"thanks to ComputeAutoSize");
aMetrics.Width() = aReflowState.ComputedWidth();
aMetrics.Height() = aReflowState.ComputedHeight();
AddBordersAndPadding(aReflowState, aMetrics);
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aStatus = NS_FRAME_COMPLETE;
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NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
("exit nsLeafFrame::DoReflow: size=%d,%d",
aMetrics.Width(), aMetrics.Height()));
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aMetrics);
aMetrics.SetOverflowAreasToDesiredBounds();
return NS_OK;
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}
nscoord
nsLeafFrame::GetIntrinsicHeight()
{
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NS_NOTREACHED("Someone didn't override Reflow or ComputeAutoSize");
return 0;
}
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// XXX how should border&padding effect baseline alignment?
// => descent = borderPadding.bottom for example
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void
nsLeafFrame::AddBordersAndPadding(const nsHTMLReflowState& aReflowState,
nsHTMLReflowMetrics& aMetrics)
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{
aMetrics.Width() += aReflowState.ComputedPhysicalBorderPadding().LeftRight();
aMetrics.Height() += aReflowState.ComputedPhysicalBorderPadding().TopBottom();
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}
void
nsLeafFrame::SizeToAvailSize(const nsHTMLReflowState& aReflowState,
nsHTMLReflowMetrics& aDesiredSize)
{
aDesiredSize.Width() = aReflowState.AvailableWidth(); // FRAME
aDesiredSize.Height() = aReflowState.AvailableHeight();
aDesiredSize.SetOverflowAreasToDesiredBounds();
FinishAndStoreOverflow(&aDesiredSize);
}