gecko-dev/layout/generic/nsAbsoluteContainingBlock.cpp

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/* -*- 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 "nsAbsoluteContainingBlock.h"
#include "nsContainerFrame.h"
#include "nsHTMLIIDs.h"
#include "nsIAreaFrame.h"
#include "nsIReflowCommand.h"
#include "nsIStyleContext.h"
#include "nsIViewManager.h"
#include "nsLayoutAtoms.h"
static NS_DEFINE_IID(kAreaFrameIID, NS_IAREAFRAME_IID);
void
nsAbsoluteContainingBlock::DeleteFrames(nsIPresContext& aPresContext)
{
mAbsoluteFrames.DeleteFrames(aPresContext);
}
nsresult
nsAbsoluteContainingBlock::FirstChild(nsIAtom* aListName,
nsIFrame** aFirstChild) const
{
NS_PRECONDITION(nsLayoutAtoms::absoluteList == aListName, "unexpected child list name");
*aFirstChild = mAbsoluteFrames.FirstChild();
return NS_OK;
}
nsresult
nsAbsoluteContainingBlock::SetInitialChildList(nsIPresContext& aPresContext,
nsIAtom* aListName,
nsIFrame* aChildList)
{
NS_PRECONDITION(nsLayoutAtoms::absoluteList == aListName, "unexpected child list name");
mAbsoluteFrames.SetFrames(aChildList);
return NS_OK;
}
nsresult
nsAbsoluteContainingBlock::Reflow(nsIPresContext& aPresContext,
const nsHTMLReflowState& aReflowState)
{
// Make a copy of the reflow state. If the reason is eReflowReason_Incremental,
// then change it to eReflowReason_Resize
nsHTMLReflowState reflowState(aReflowState);
if (eReflowReason_Incremental == reflowState.reason) {
reflowState.reason = eReflowReason_Resize;
}
nsIFrame* kidFrame;
for (kidFrame = mAbsoluteFrames.FirstChild(); nsnull != kidFrame; kidFrame->GetNextSibling(&kidFrame)) {
// Reflow the frame
nsReflowStatus kidStatus;
ReflowAbsoluteFrame(aPresContext, reflowState, kidFrame, PR_FALSE,
kidStatus);
}
return NS_OK;
}
nsresult
nsAbsoluteContainingBlock::IncrementalReflow(nsIPresContext& aPresContext,
const nsHTMLReflowState& aReflowState,
PRBool& aWasHandled)
{
// Initialize the OUT paremeter
aWasHandled = PR_FALSE;
// See if the reflow command is targeted at us
nsIFrame* targetFrame;
aReflowState.reflowCommand->GetTarget(targetFrame);
if (aReflowState.frame == targetFrame) {
nsIAtom* listName;
PRBool isAbsoluteChild;
// It's targeted at us. See if the child frame is absolutely positioned
aReflowState.reflowCommand->GetChildListName(listName);
isAbsoluteChild = nsLayoutAtoms::absoluteList == listName;
NS_IF_RELEASE(listName);
if (isAbsoluteChild) {
nsIReflowCommand::ReflowType type;
nsIFrame* newFrames;
PRInt32 numFrames = 0;
// Get the type of reflow command
aReflowState.reflowCommand->GetType(type);
// Handle each specific type
if (nsIReflowCommand::FrameAppended == type) {
// Add the frames to our list of absolutely position frames
aReflowState.reflowCommand->GetChildFrame(newFrames);
NS_ASSERTION(nsnull != newFrames, "null child list");
numFrames = nsContainerFrame::LengthOf(newFrames);
mAbsoluteFrames.AppendFrames(nsnull, newFrames);
} else if (nsIReflowCommand::FrameRemoved == type) {
// Get the new frame
nsIFrame* childFrame;
aReflowState.reflowCommand->GetChildFrame(childFrame);
PRBool result = mAbsoluteFrames.DeleteFrame(aPresContext, childFrame);
NS_ASSERTION(result, "didn't find frame to delete");
} else if (nsIReflowCommand::FrameInserted == type) {
// Get the previous sibling
nsIFrame* prevSibling;
aReflowState.reflowCommand->GetPrevSiblingFrame(prevSibling);
// Insert the new frames
aReflowState.reflowCommand->GetChildFrame(newFrames);
NS_ASSERTION(nsnull != newFrames, "null child list");
numFrames = nsContainerFrame::LengthOf(newFrames);
mAbsoluteFrames.InsertFrames(nsnull, prevSibling, newFrames);
} else {
NS_ASSERTION(PR_FALSE, "unexpected reflow type");
}
// For inserted and appended reflow commands we need to reflow the
// newly added frames
if ((nsIReflowCommand::FrameAppended == type) ||
(nsIReflowCommand::FrameInserted == type)) {
while (numFrames-- > 0) {
nsReflowStatus status;
ReflowAbsoluteFrame(aPresContext, aReflowState, newFrames, PR_TRUE, status);
newFrames->GetNextSibling(&newFrames);
}
}
// Indicate we handled the reflow command
aWasHandled = PR_TRUE;
}
} else {
// Peek at the next frame in the reflow path
nsIFrame* nextFrame;
aReflowState.reflowCommand->GetNext(nextFrame, PR_FALSE);
// See if it's one of our absolutely positioned child frames
NS_ASSERTION(nsnull != nextFrame, "next frame in reflow command is null");
if (mAbsoluteFrames.ContainsFrame(nextFrame)) {
// Remove the next frame from the reflow path
aReflowState.reflowCommand->GetNext(nextFrame, PR_TRUE);
nsReflowStatus kidStatus;
ReflowAbsoluteFrame(aPresContext, aReflowState, nextFrame, PR_FALSE, kidStatus);
// XXX Make sure the frame is repainted. For the time being, since we
// have no idea what actually changed repaint it all...
nsIView* view;
nextFrame->GetView(&view);
if (nsnull != view) {
nsIViewManager* viewMgr;
view->GetViewManager(viewMgr);
if (nsnull != viewMgr) {
viewMgr->UpdateView(view, (nsIRegion*)nsnull, NS_VMREFRESH_NO_SYNC);
NS_RELEASE(viewMgr);
}
}
aWasHandled = PR_TRUE;
}
}
return NS_OK;
}
// XXX Optimize the case where it's a resize reflow and the absolutely
// positioned child has the exact same size and position and skip the
// reflow...
nsresult
nsAbsoluteContainingBlock::ReflowAbsoluteFrame(nsIPresContext& aPresContext,
const nsHTMLReflowState& aReflowState,
nsIFrame* aKidFrame,
PRBool aInitialReflow,
nsReflowStatus& aStatus)
{
nsresult rv;
nsMargin border;
// Get the border values
aReflowState.mStyleSpacing->GetBorder(border);
nsIHTMLReflow* htmlReflow;
rv = aKidFrame->QueryInterface(kIHTMLReflowIID, (void**)&htmlReflow);
if (NS_SUCCEEDED(rv)) {
htmlReflow->WillReflow(aPresContext);
nsSize availSize(aReflowState.computedWidth, NS_UNCONSTRAINEDSIZE);
nsHTMLReflowMetrics kidDesiredSize(nsnull);
nsHTMLReflowState kidReflowState(aPresContext, aReflowState, aKidFrame,
availSize);
// If it's the initial reflow, then override the reflow reason. This is
// used when frames are inserted incrementally
if (aInitialReflow) {
kidReflowState.reason = eReflowReason_Initial;
}
rv = htmlReflow->Reflow(aPresContext, kidDesiredSize, kidReflowState, aStatus);
// XXX If the child had a fixed height, then make sure it respected it...
if (NS_AUTOHEIGHT != kidReflowState.computedHeight) {
if (kidDesiredSize.height < kidReflowState.computedHeight) {
kidDesiredSize.height = kidReflowState.computedHeight;
kidDesiredSize.height += kidReflowState.mComputedBorderPadding.top +
kidReflowState.mComputedBorderPadding.bottom;
}
}
// Position the child relative to our padding edge
nsRect rect(border.left + kidReflowState.computedOffsets.left + kidReflowState.computedMargin.left,
border.top + kidReflowState.computedOffsets.top + kidReflowState.computedMargin.top,
kidDesiredSize.width, kidDesiredSize.height);
aKidFrame->SetRect(rect);
}
return rv;
}
nsresult
nsAbsoluteContainingBlock::GetPositionedInfo(nscoord& aXMost, nscoord& aYMost) const
{
aXMost = aYMost = 0;
for (nsIFrame* f = mAbsoluteFrames.FirstChild(); nsnull != f; f->GetNextSibling(&f)) {
// Get the frame's x-most and y-most. This is for its flowed content only
nsRect rect;
f->GetRect(rect);
if (rect.XMost() > aXMost) {
aXMost = rect.XMost();
}
if (rect.YMost() > aYMost) {
aYMost = rect.YMost();
}
// If the child frame is also an area frame, then take into account its child
// absolutely positioned elements
nsIAreaFrame* areaFrame;
if (NS_SUCCEEDED(f->QueryInterface(kAreaFrameIID, (void**)&areaFrame))) {
nscoord xMost, yMost;
areaFrame->GetPositionedInfo(xMost, yMost);
// Convert to our coordinate space
xMost += rect.x;
yMost += rect.y;
if (xMost > aXMost) {
aXMost = xMost;
}
if (yMost > aYMost) {
aYMost = yMost;
}
}
}
return NS_OK;
}