pjs/layout/generic/nsPlaceholderFrame.cpp

192 строки
5.4 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 "nsIContent.h"
#include "nsIContentDelegate.h"
#include "nsIFloaterContainer.h"
static NS_DEFINE_IID(kIFloaterContainerIID, NS_IFLOATERCONTAINER_IID);
nsresult
PlaceholderFrame::NewFrame(nsIFrame** aInstancePtrResult,
nsIContent* aContent,
nsIFrame* aParent)
{
NS_PRECONDITION(nsnull != aInstancePtrResult, "null ptr");
if (nsnull == aInstancePtrResult) {
return NS_ERROR_NULL_POINTER;
}
nsIFrame* it = new PlaceholderFrame(aContent, aParent);
if (nsnull == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
*aInstancePtrResult = it;
return NS_OK;
}
PlaceholderFrame::PlaceholderFrame(nsIContent* aContent, nsIFrame* aParent)
: nsFrame(aContent, aParent)
{
mAnchoredItem = nsnull;
}
PlaceholderFrame::~PlaceholderFrame()
{
}
NS_METHOD PlaceholderFrame::ResizeReflow(nsIPresContext* aPresContext,
nsReflowMetrics& aDesiredSize,
const nsSize& aMaxSize,
nsSize* aMaxElementSize,
nsReflowStatus& aStatus)
{
// Get the floater container in which we're inserted
nsIFloaterContainer* container = nsnull;
for (nsIFrame* parent = mGeometricParent; parent; parent->GetGeometricParent(parent)) {
if (NS_OK == parent->QueryInterface(kIFloaterContainerIID, (void**)&container)) {
break;
}
}
NS_ASSERTION(nsnull != container, "no floater container");
// Have we created the anchored item yet?
if (nsnull == mAnchoredItem) {
// Create the anchored item
nsIContentDelegate* delegate = mContent->GetDelegate(aPresContext);
nsresult rv = delegate->CreateFrame(aPresContext, mContent,
mGeometricParent, mStyleContext,
mAnchoredItem);
NS_RELEASE(delegate);
if (NS_OK != rv) {
return rv;
}
// Resize reflow the anchored item into the available space
// XXX Check for complete?
mAnchoredItem->ResizeReflow(aPresContext, aDesiredSize, aMaxSize,
nsnull, aStatus);
mAnchoredItem->SizeTo(aDesiredSize.width, aDesiredSize.height);
// Now notify our containing block that there's a new floater
container->AddFloater(aPresContext, mAnchoredItem, this);
} else {
// XXX This causes anchored-items sizes to get fixed up; this is
// not quite right because this class should be implementing one
// of the incremental reflow methods and propogating things down
// properly to the contained frame.
mAnchoredItem->ResizeReflow(aPresContext, aDesiredSize, aMaxSize,
nsnull, aStatus);
mAnchoredItem->SizeTo(aDesiredSize.width, aDesiredSize.height);
container->PlaceFloater(aPresContext, mAnchoredItem, this);
}
return nsFrame::ResizeReflow(aPresContext, aDesiredSize, aMaxSize, aMaxElementSize, aStatus);
}
NS_METHOD
PlaceholderFrame::ChildCount(PRInt32& aChildCount) const
{
aChildCount = 1;
return NS_OK;
}
NS_METHOD
PlaceholderFrame::ChildAt(PRInt32 aIndex, nsIFrame*& aFrame) const
{
aFrame = (0 == aIndex) ? mAnchoredItem : nsnull;
return NS_OK;
}
NS_METHOD
PlaceholderFrame::IndexOf(const nsIFrame* aChild, PRInt32& aIndex) const
{
aIndex = (aChild == mAnchoredItem) ? 0 : -1;
return NS_OK;
}
NS_METHOD
PlaceholderFrame::FirstChild(nsIFrame*& aFirstChild) const
{
aFirstChild = mAnchoredItem;
return NS_OK;
}
NS_METHOD
PlaceholderFrame::NextChild(const nsIFrame* aChild, nsIFrame*& aNextChild) const
{
aNextChild = nsnull;
return NS_OK;
}
NS_METHOD
PlaceholderFrame::PrevChild(const nsIFrame* aChild, nsIFrame*& aPrevChild) const
{
aPrevChild = nsnull;
return NS_OK;
}
NS_METHOD
PlaceholderFrame::LastChild(nsIFrame*& aLastChild) const
{
aLastChild = mAnchoredItem;
return NS_OK;
}
NS_METHOD PlaceholderFrame::ListTag(FILE* out) const
{
fputs("*placeholder", out);
PRInt32 contentIndex;
GetContentIndex(contentIndex);
fprintf(out, "(%d)@%p", contentIndex, this);
return NS_OK;
}
NS_METHOD
PlaceholderFrame::List(FILE* out, PRInt32 aIndent) const
{
PRInt32 i;
// Indent
for (i = aIndent; --i >= 0; ) fputs(" ", out);
// Output the tag
ListTag(out);
// Output the rect
out << mRect;
// Output the children
if (nsnull != mAnchoredItem) {
if (0 != mState) {
fprintf(out, " [state=%08x]", mState);
}
fputs("<\n", out);
mAnchoredItem->List(out, aIndent + 1);
for (i = aIndent; --i >= 0; ) fputs(" ", out);
fputs(">\n", out);
} else {
if (0 != mState) {
fprintf(out, " [state=%08x]", mState);
}
fputs("<>\n", out);
}
return NS_OK;
}