gecko-dev/layout/generic/nsSpacerFrame.cpp
leon.sha%sun.com 0960e6fd1d Bug 333896
Convert GetAttr calls to AttrValueIs and FindAttrValueIn.
Patch by alfred.peng@sun.com.
roc: review+
roc: superreview+
2006-04-24 05:40:11 +00:00

177 lines
5.5 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
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*
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* 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):
*
* 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
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/* rendering object for HTML <spacer> element */
#include "nsHTMLParts.h"
#include "nsFrame.h"
#include "nsLineLayout.h"
#include "nsPresContext.h"
#include "nsHTMLAtoms.h"
#include "nsUnitConversion.h"
#include "nsStyleConsts.h"
#include "nsINameSpaceManager.h"
// Spacer type's
#define TYPE_WORD 0 // horizontal space
#define TYPE_LINE 1 // line-break + vertical space
#define TYPE_IMAGE 2 // acts like a sized image with nothing to see
class SpacerFrame : public nsFrame {
public:
friend nsIFrame* NS_NewSpacerFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
// nsIHTMLReflow
NS_IMETHOD Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
PRUint8 GetType();
protected:
SpacerFrame(nsStyleContext* aContext) : nsFrame(aContext) {}
virtual ~SpacerFrame();
};
nsIFrame*
NS_NewSpacerFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) SpacerFrame(aContext);
}
SpacerFrame::~SpacerFrame()
{
}
NS_IMETHODIMP
SpacerFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("SpacerFrame", aReflowState.reason);
DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aStatus);
aStatus = NS_FRAME_COMPLETE;
// By default, we have no area
aMetrics.width = 0;
aMetrics.height = 0;
aMetrics.ascent = 0;
aMetrics.descent = 0;
const nsStylePosition* position = GetStylePosition();
PRUint8 type = GetType();
switch (type) {
case TYPE_WORD:
break;
case TYPE_LINE:
aStatus = NS_INLINE_LINE_BREAK_AFTER(NS_FRAME_COMPLETE);
if (eStyleUnit_Coord == position->mHeight.GetUnit()) {
aMetrics.width = position->mHeight.GetCoordValue();
}
aMetrics.ascent = aMetrics.height;
break;
case TYPE_IMAGE:
// width
nsStyleUnit unit = position->mWidth.GetUnit();
if (eStyleUnit_Coord == unit) {
aMetrics.width = position->mWidth.GetCoordValue();
}
else if (eStyleUnit_Percent == unit)
{
if (NS_UNCONSTRAINEDSIZE != aReflowState.availableWidth)
{
float factor = position->mWidth.GetPercentValue();
aMetrics.width = NSToCoordRound (factor * aReflowState.availableWidth);
}
}
// height
unit = position->mHeight.GetUnit();
if (eStyleUnit_Coord == unit) {
aMetrics.height = position->mHeight.GetCoordValue();
}
else if (eStyleUnit_Percent == unit)
{
if (NS_UNCONSTRAINEDSIZE != aReflowState.availableHeight)
{
float factor = position->mHeight.GetPercentValue();
aMetrics.width = NSToCoordRound (factor * aReflowState.availableHeight);
}
}
// accent
aMetrics.ascent = aMetrics.height;
break;
}
if (aMetrics.width || aMetrics.height) {
// Make sure that the other dimension is non-zero
if (!aMetrics.width) aMetrics.width = 1;
if (!aMetrics.height) aMetrics.height = 1;
}
if (aMetrics.mComputeMEW) {
aMetrics.SetMEWToActualWidth(aReflowState.mStylePosition->mWidth.GetUnit());
}
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aMetrics);
return NS_OK;
}
PRUint8
SpacerFrame::GetType()
{
PRUint8 type = TYPE_WORD;
static nsIContent::AttrValuesArray strings[] =
{&nsHTMLAtoms::line, &nsHTMLAtoms::vert, &nsHTMLAtoms::vertical,
&nsHTMLAtoms::block, nsnull};
switch (mContent->FindAttrValueIn(kNameSpaceID_None, nsHTMLAtoms::type,
strings, eIgnoreCase)) {
case 0:
case 1:
case 2:
return TYPE_LINE;
case 3:
return TYPE_IMAGE;
}
return type;
}