gecko-dev/layout/generic/nsPlaceholderFrame.cpp

168 lines
5.5 KiB
C++

/* -*- 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 ***** */
#include "nsPlaceholderFrame.h"
#include "nsLineLayout.h"
#include "nsIContent.h"
#include "nsPresContext.h"
#include "nsIRenderingContext.h"
#include "nsLayoutAtoms.h"
#include "nsFrameManager.h"
nsresult
NS_NewPlaceholderFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame)
{
NS_PRECONDITION(aNewFrame, "null OUT ptr");
if (nsnull == aNewFrame) {
return NS_ERROR_NULL_POINTER;
}
nsPlaceholderFrame* it = new (aPresShell) nsPlaceholderFrame;
if (nsnull == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
*aNewFrame = it;
return NS_OK;
}
// These are useful for debugging
nsPlaceholderFrame::nsPlaceholderFrame()
{
}
nsPlaceholderFrame::~nsPlaceholderFrame()
{
}
NS_IMETHODIMP
nsPlaceholderFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsPlaceholderFrame", aReflowState.reason);
DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
aDesiredSize.width = 0;
aDesiredSize.height = 0;
aDesiredSize.ascent = 0;
aDesiredSize.descent = 0;
if (aDesiredSize.mComputeMEW) {
aDesiredSize.mMaxElementWidth = 0;
}
aStatus = NS_FRAME_COMPLETE;
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
return NS_OK;
}
NS_IMETHODIMP
nsPlaceholderFrame::Destroy(nsPresContext* aPresContext)
{
nsIPresShell* shell = aPresContext->GetPresShell();
if (shell && mOutOfFlowFrame) {
NS_ASSERTION(!shell->FrameManager()->GetPlaceholderFrameFor(mOutOfFlowFrame),
"Placeholder relationship should have been torn down");
}
return nsSplittableFrame::Destroy(aPresContext);
}
nsIAtom*
nsPlaceholderFrame::GetType() const
{
return nsLayoutAtoms::placeholderFrame;
}
#ifdef DEBUG
NS_IMETHODIMP
nsPlaceholderFrame::Paint(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsFramePaintLayer aWhichLayer,
PRUint32 aFlags)
{
if ((NS_FRAME_PAINT_LAYER_DEBUG == aWhichLayer) && GetShowFrameBorders()) {
float p2t;
p2t = aPresContext->PixelsToTwips();
aRenderingContext.SetColor(NS_RGB(0, 255, 255));
nscoord x = NSIntPixelsToTwips(-5, p2t);
aRenderingContext.FillRect(x, 0, NSIntPixelsToTwips(13, p2t),
NSIntPixelsToTwips(3, p2t));
nscoord y = NSIntPixelsToTwips(-10, p2t);
aRenderingContext.FillRect(0, y, NSIntPixelsToTwips(3, p2t),
NSIntPixelsToTwips(10, p2t));
}
DO_GLOBAL_REFLOW_COUNT_DSP("nsPlaceholderFrame", &aRenderingContext);
return NS_OK;
}
NS_IMETHODIMP
nsPlaceholderFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("Placeholder"), aResult);
}
NS_IMETHODIMP
nsPlaceholderFrame::List(nsPresContext* aPresContext, FILE* out, PRInt32 aIndent) const
{
IndentBy(out, aIndent);
ListTag(out);
#ifdef DEBUG_waterson
fprintf(out, " [parent=%p]", NS_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=%08x]", mState);
}
nsIFrame* prevInFlow = GetPrevInFlow();
nsIFrame* nextInFlow = GetNextInFlow();
if (nsnull != prevInFlow) {
fprintf(out, " prev-in-flow=%p", NS_STATIC_CAST(void*, prevInFlow));
}
if (nsnull != nextInFlow) {
fprintf(out, " next-in-flow=%p", NS_STATIC_CAST(void*, nextInFlow));
}
if (mOutOfFlowFrame) {
fprintf(out, " outOfFlowFrame=");
nsFrame::ListTag(out, mOutOfFlowFrame);
}
fputs("\n", out);
return NS_OK;
}
#endif