gecko-dev/layout/generic/nsSpacerFrame.cpp
2000-04-21 14:59:47 +00:00

181 lines
4.9 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#include "nsHTMLParts.h"
#include "nsIHTMLContent.h"
#include "nsFrame.h"
#include "nsLineLayout.h"
#include "nsHTMLIIDs.h"
#include "nsIPresContext.h"
#include "nsHTMLAtoms.h"
#include "nsUnitConversion.h"
#include "nsIStyleContext.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 nsresult NS_NewSpacerFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame);
// nsIHTMLReflow
NS_IMETHOD Reflow(nsIPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
PRUint8 GetType();
protected:
SpacerFrame();
virtual ~SpacerFrame();
};
nsresult
NS_NewSpacerFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame)
{
NS_PRECONDITION(aNewFrame, "null OUT ptr");
if (nsnull == aNewFrame) {
return NS_ERROR_NULL_POINTER;
}
SpacerFrame* it = new (aPresShell) SpacerFrame;
if (nsnull == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
*aNewFrame = it;
return NS_OK;
}
SpacerFrame::SpacerFrame()
{
}
SpacerFrame::~SpacerFrame()
{
}
NS_IMETHODIMP
SpacerFrame::Reflow(nsIPresContext* aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("SpacerFrame", aReflowState.reason);
aStatus = NS_FRAME_COMPLETE;
// By default, we have no area
aMetrics.width = 0;
aMetrics.height = 0;
aMetrics.ascent = 0;
aMetrics.descent = 0;
nscoord width = 0;
nscoord height = 0;
PRUint8 type = GetType();
nsresult ca;
nsIHTMLContent* hc = nsnull;
mContent->QueryInterface(kIHTMLContentIID, (void**) &hc);
if (nsnull != hc) {
if (type != TYPE_IMAGE) {
nsHTMLValue val;
ca = hc->GetHTMLAttribute(nsHTMLAtoms::size, val);
if (NS_CONTENT_ATTR_HAS_VALUE == ca) {
width = val.GetPixelValue();
}
} else {
nsHTMLValue val;
ca = hc->GetHTMLAttribute(nsHTMLAtoms::width, val);
if (NS_CONTENT_ATTR_HAS_VALUE == ca) {
if (eHTMLUnit_Pixel == val.GetUnit()) {
width = val.GetPixelValue();
}
}
ca = hc->GetHTMLAttribute(nsHTMLAtoms::height, val);
if (NS_CONTENT_ATTR_HAS_VALUE == ca) {
if (eHTMLUnit_Pixel == val.GetUnit()) {
height = val.GetPixelValue();
}
}
}
NS_RELEASE(hc);
}
float p2t;
aPresContext->GetScaledPixelsToTwips(&p2t);
switch (type) {
case TYPE_WORD:
if (0 != width) {
aMetrics.width = NSIntPixelsToTwips(width, p2t);
}
break;
case TYPE_LINE:
if (0 != width) {
aStatus = NS_INLINE_LINE_BREAK_AFTER(NS_FRAME_COMPLETE);
aMetrics.height = NSIntPixelsToTwips(width, p2t);
aMetrics.ascent = aMetrics.height;
}
break;
case TYPE_IMAGE:
aMetrics.width = NSIntPixelsToTwips(width, p2t);
aMetrics.height = NSIntPixelsToTwips(height, p2t);
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 (nsnull != aMetrics.maxElementSize) {
aMetrics.maxElementSize->width = aMetrics.width;
aMetrics.maxElementSize->height = aMetrics.height;
}
return NS_OK;
}
PRUint8
SpacerFrame::GetType()
{
PRUint8 type = TYPE_WORD;
nsAutoString value;
if (NS_CONTENT_ATTR_HAS_VALUE ==
mContent->GetAttribute(kNameSpaceID_HTML, nsHTMLAtoms::type, value)) {
if (value.EqualsIgnoreCase("line") ||
value.EqualsIgnoreCase("vert") ||
value.EqualsIgnoreCase("vertical")) {
return TYPE_LINE;
}
if (value.EqualsIgnoreCase("block")) {
return TYPE_IMAGE;
}
}
return type;
}