gecko-dev/layout/generic/nsPlaceholderFrame.cpp

121 строка
3.8 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 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "nsPlaceholderFrame.h"
#include "nsLineLayout.h"
#include "nsHTMLIIDs.h"
#include "nsIContent.h"
#include "nsIPresContext.h"
#include "nsIRenderingContext.h"
#include "nsIStyleContext.h"
nsresult
NS_NewPlaceholderFrame(nsIFrame** aInstancePtrResult)
{
NS_PRECONDITION(nsnull != aInstancePtrResult, "null ptr");
if (nsnull == aInstancePtrResult) {
return NS_ERROR_NULL_POINTER;
}
nsIFrame* it = new nsPlaceholderFrame;
if (nsnull == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
*aInstancePtrResult = it;
return NS_OK;
}
NS_IMETHODIMP
nsPlaceholderFrame::Reflow(nsIPresContext& aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
if (nsnull != aReflowState.lineLayout) {
if (eReflowReason_Initial == aReflowState.reason) {
aReflowState.lineLayout->InitFloater(this);
}
else {
aReflowState.lineLayout->AddFloater(this);
}
}
aDesiredSize.width = 0;
aDesiredSize.height = 0;
aDesiredSize.ascent = 0;
aDesiredSize.descent = 0;
if (nsnull != aDesiredSize.maxElementSize) {
aDesiredSize.maxElementSize->width = 0;
aDesiredSize.maxElementSize->height = 0;
}
aStatus = NS_FRAME_COMPLETE;
return NS_OK;
}
NS_IMETHODIMP
nsPlaceholderFrame::Paint(nsIPresContext& aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect)
{
if (nsIFrame::GetShowFrameBorders()) {
float p2t = aPresContext.GetPixelsToTwips();
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));
}
return NS_OK;
}
NS_IMETHODIMP
nsPlaceholderFrame::ContentChanged(nsIPresContext* aPresContext,
nsIContent* aChild,
nsISupports* aSubContent)
{
NS_ASSERTION(mContent == aChild, "bad content-changed target");
// Forward the notification to the floater
if (nsnull != mAnchoredItem) {
return mAnchoredItem->ContentChanged(aPresContext, aChild, aSubContent);
}
return NS_OK;
}
NS_IMETHODIMP
nsPlaceholderFrame::AttributeChanged(nsIPresContext* aPresContext,
nsIContent* aChild,
nsIAtom* aAttribute,
PRInt32 aHint)
{
// Forward the notification to the floater
if (nsnull != mAnchoredItem) {
return mAnchoredItem->AttributeChanged(aPresContext, aChild,
aAttribute, aHint);
}
return NS_OK;
}
NS_IMETHODIMP
nsPlaceholderFrame::GetFrameName(nsString& aResult) const
{
return MakeFrameName("Placeholder", aResult);
}