gecko-dev/layout/generic/nsHTMLReflowCommand.cpp
1999-08-19 03:51:25 +00:00

209 lines
6.0 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 "nsCOMPtr.h"
#include "nsHTMLReflowCommand.h"
#include "nsHTMLParts.h"
#include "nsIFrame.h"
#include "nsIHTMLReflow.h"
#include "nsIPresContext.h"
#include "nsIPresShell.h"
#include "nsIContent.h"
#include "nsIStyleContext.h"
#include "nsStyleConsts.h"
#include "nsHTMLIIDs.h"
static NS_DEFINE_IID(kIReflowCommandIID, NS_IREFLOWCOMMAND_IID);
nsresult
NS_NewHTMLReflowCommand(nsIReflowCommand** aInstancePtrResult,
nsIFrame* aTargetFrame,
nsIReflowCommand::ReflowType aReflowType,
nsIFrame* aChildFrame,
nsIAtom* aAttribute)
{
NS_PRECONDITION(nsnull != aInstancePtrResult, "null ptr");
if (nsnull == aInstancePtrResult) {
return NS_ERROR_NULL_POINTER;
}
nsHTMLReflowCommand* cmd = new nsHTMLReflowCommand(aTargetFrame, aReflowType, aChildFrame, aAttribute);
if (nsnull == cmd) {
return NS_ERROR_OUT_OF_MEMORY;
}
return cmd->QueryInterface(kIReflowCommandIID, (void**)aInstancePtrResult);
}
// Construct a reflow command given a target frame, reflow command type,
// and optional child frame
nsHTMLReflowCommand::nsHTMLReflowCommand(nsIFrame* aTargetFrame,
ReflowType aReflowType,
nsIFrame* aChildFrame,
nsIAtom* aAttribute)
: mType(aReflowType), mTargetFrame(aTargetFrame), mChildFrame(aChildFrame),
mPrevSiblingFrame(nsnull),
mAttribute(aAttribute),
mListName(nsnull)
{
NS_PRECONDITION(mTargetFrame != nsnull, "null target frame");
if (nsnull!=mAttribute)
NS_ADDREF(mAttribute);
NS_INIT_REFCNT();
}
nsHTMLReflowCommand::~nsHTMLReflowCommand()
{
NS_IF_RELEASE(mAttribute);
NS_IF_RELEASE(mListName);
}
NS_IMPL_ISUPPORTS(nsHTMLReflowCommand, kIReflowCommandIID);
nsIFrame* nsHTMLReflowCommand::GetContainingBlock(nsIFrame* aFloater)
{
nsIFrame* containingBlock;
aFloater->GetParent(&containingBlock);
return containingBlock;
}
void nsHTMLReflowCommand::BuildPath()
{
mPath.Clear();
// Floating frames are handled differently. The path goes from the target
// frame to the containing block, and then up the hierarchy
const nsStyleDisplay* display;
mTargetFrame->GetStyleData(eStyleStruct_Display, (const nsStyleStruct*&)display);
if (NS_STYLE_FLOAT_NONE != display->mFloats) {
mPath.AppendElement((void*)mTargetFrame);
for (nsIFrame* f = GetContainingBlock(mTargetFrame); nsnull != f; f->GetParent(&f)) {
mPath.AppendElement((void*)f);
}
} else {
for (nsIFrame* f = mTargetFrame; nsnull != f; f->GetParent(&f)) {
mPath.AppendElement((void*)f);
}
}
}
NS_IMETHODIMP nsHTMLReflowCommand::Dispatch(nsIPresContext& aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsSize& aMaxSize,
nsIRenderingContext& aRendContext)
{
// Build the path from the target frame (index 0) to the root frame
BuildPath();
// Send an incremental reflow notification to the root frame
nsIFrame* root = (nsIFrame*)mPath[mPath.Count() - 1];
#ifdef NS_DEBUG
nsCOMPtr<nsIPresShell> shell;
aPresContext.GetShell(getter_AddRefs(shell));
if (shell) {
nsIFrame* rootFrame;
shell->GetRootFrame(&rootFrame);
NS_ASSERTION(rootFrame == root, "bad root frame");
}
#endif
if (nsnull != root) {
mPath.RemoveElementAt(mPath.Count() - 1);
nsHTMLReflowState reflowState(aPresContext, root, *this,
&aRendContext, aMaxSize);
nsIHTMLReflow* htmlReflow;
nsReflowStatus status;
if (NS_OK == root->QueryInterface(kIHTMLReflowIID, (void**)&htmlReflow)) {
htmlReflow->Reflow(aPresContext, aDesiredSize, reflowState, status);
}
}
return NS_OK;
}
NS_IMETHODIMP nsHTMLReflowCommand::GetNext(nsIFrame*& aNextFrame, PRBool aRemove)
{
PRInt32 count = mPath.Count();
aNextFrame = nsnull;
if (count > 0) {
aNextFrame = (nsIFrame*)mPath[count - 1];
if (aRemove) {
mPath.RemoveElementAt(count - 1);
}
}
return NS_OK;
}
NS_IMETHODIMP nsHTMLReflowCommand::GetTarget(nsIFrame*& aTargetFrame) const
{
aTargetFrame = mTargetFrame;
return NS_OK;
}
NS_IMETHODIMP nsHTMLReflowCommand::SetTarget(nsIFrame* aTargetFrame)
{
mTargetFrame = aTargetFrame;
return NS_OK;
}
NS_IMETHODIMP nsHTMLReflowCommand::GetType(ReflowType& aReflowType) const
{
aReflowType = mType;
return NS_OK;
}
NS_IMETHODIMP nsHTMLReflowCommand::GetAttribute(nsIAtom *& aAttribute) const
{
aAttribute = mAttribute;
if (nsnull!=aAttribute)
NS_ADDREF(aAttribute);
return NS_OK;
}
NS_IMETHODIMP nsHTMLReflowCommand::GetChildFrame(nsIFrame*& aChildFrame) const
{
aChildFrame = mChildFrame;
return NS_OK;
}
NS_IMETHODIMP nsHTMLReflowCommand::GetChildListName(nsIAtom*& aListName) const
{
aListName = mListName;
NS_IF_ADDREF(aListName);
return NS_OK;
}
NS_IMETHODIMP nsHTMLReflowCommand::SetChildListName(nsIAtom* aListName)
{
mListName = aListName;
NS_IF_ADDREF(mListName);
return NS_OK;
}
NS_IMETHODIMP nsHTMLReflowCommand::GetPrevSiblingFrame(nsIFrame*& aSiblingFrame) const
{
aSiblingFrame = mPrevSiblingFrame;
return NS_OK;
}