gecko/layout/generic/nsSpacerFrame.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):
*
* 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 HTML <spacer> element */
#include "nsHTMLParts.h"
#include "nsFrame.h"
#include "nsLineLayout.h"
#include "nsPresContext.h"
#include "nsGkAtoms.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
virtual nscoord GetMinWidth(nsIRenderingContext *aRenderingContext);
virtual nscoord GetPrefWidth(nsIRenderingContext *aRenderingContext);
NS_IMETHOD Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
PRUint8 GetType();
protected:
SpacerFrame(nsStyleContext* aContext) : nsFrame(aContext) {}
virtual ~SpacerFrame();
void GetDesiredSize(nsHTMLReflowMetrics& aMetrics, nsSize aPercentBase);
};
nsIFrame*
NS_NewSpacerFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
#ifdef DEBUG
const nsStyleDisplay* disp = aContext->GetStyleDisplay();
NS_ASSERTION(!disp->IsAbsolutelyPositioned() && !disp->IsFloating(),
"Spacers should not be positioned and should not float");
#endif
return new (aPresShell) SpacerFrame(aContext);
}
SpacerFrame::~SpacerFrame()
{
}
/* virtual */ nscoord
SpacerFrame::GetMinWidth(nsIRenderingContext *aRenderingContext)
{
nsHTMLReflowMetrics metrics;
DISPLAY_MIN_WIDTH(this, metrics.width);
GetDesiredSize(metrics, nsSize(0, 0));
return metrics.width;
}
/* virtual */ nscoord
SpacerFrame::GetPrefWidth(nsIRenderingContext *aRenderingContext)
{
nsHTMLReflowMetrics metrics;
DISPLAY_PREF_WIDTH(this, metrics.width);
GetDesiredSize(metrics, nsSize(0, 0));
return metrics.width;
}
NS_IMETHODIMP
SpacerFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("SpacerFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aStatus);
aStatus = NS_FRAME_COMPLETE;
// XXX Bug 379654 Should use containing block size!
nsSize percentBase(aReflowState.availableWidth, aReflowState.availableHeight);
if (percentBase.width == NS_UNCONSTRAINEDSIZE)
percentBase.width = 0;
if (percentBase.height == NS_UNCONSTRAINEDSIZE)
percentBase.height = 0;
if (GetType() == TYPE_LINE)
aStatus = NS_INLINE_LINE_BREAK_AFTER(NS_FRAME_COMPLETE);
GetDesiredSize(aMetrics, percentBase);
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aMetrics);
return NS_OK;
}
void
SpacerFrame::GetDesiredSize(nsHTMLReflowMetrics& aMetrics, nsSize aPercentBase)
{
// By default, we have no area
aMetrics.width = 0;
aMetrics.height = 0;
// XXX Bug 379654 This code doesn't handle some value types for width
// and height, doesn't handle min/max-width/height, doesn't handle
// border and padding, doesn't handle 'ch' units, doesn't handle the
// enumerated values on width, etc. But it probably doesn't much
// matter.
const nsStylePosition* position = GetStylePosition();
PRUint8 type = GetType();
switch (type) {
case TYPE_WORD:
break;
case TYPE_LINE:
if (eStyleUnit_Coord == position->mHeight.GetUnit()) {
aMetrics.height = position->mHeight.GetCoordValue();
}
break;
case TYPE_IMAGE:
// width
nsStyleUnit unit = position->mWidth.GetUnit();
if (eStyleUnit_Coord == unit) {
aMetrics.width = position->mWidth.GetCoordValue();
}
else if (eStyleUnit_Percent == unit)
{
float factor = position->mWidth.GetPercentValue();
aMetrics.width = NSToCoordRound(factor * aPercentBase.width);
}
// height
unit = position->mHeight.GetUnit();
if (eStyleUnit_Coord == unit) {
aMetrics.height = position->mHeight.GetCoordValue();
}
else if (eStyleUnit_Percent == unit)
{
float factor = position->mHeight.GetPercentValue();
aMetrics.height = NSToCoordRound(factor * aPercentBase.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;
}
}
PRUint8
SpacerFrame::GetType()
{
PRUint8 type = TYPE_WORD;
static nsIContent::AttrValuesArray strings[] =
{&nsGkAtoms::line, &nsGkAtoms::vert, &nsGkAtoms::vertical,
&nsGkAtoms::block, nsnull};
switch (mContent->FindAttrValueIn(kNameSpaceID_None, nsGkAtoms::type,
strings, eIgnoreCase)) {
case 0:
case 1:
case 2:
return TYPE_LINE;
case 3:
return TYPE_IMAGE;
}
return type;
}