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"
#include "nsIReflowCommand.h"
#include "nsIPresShell.h"
#include "nsHTMLParts.h"
static NS_DEFINE_IID(kAreaFrameIID, NS_IAREAFRAME_IID);
nsresult
nsAbsoluteContainingBlock::FirstChild(const nsIFrame* aDelegatingFrame,
nsIAtom* aListName,
nsIFrame** aFirstChild) const
{
NS_PRECONDITION(nsLayoutAtoms::absoluteList == aListName, "unexpected child list name");
*aFirstChild = mAbsoluteFrames.FirstChild();
return NS_OK;
}
nsresult
nsAbsoluteContainingBlock::SetInitialChildList(nsIFrame* aDelegatingFrame,
nsIPresContext& aPresContext,
nsIAtom* aListName,
nsIFrame* aChildList)
{
NS_PRECONDITION(nsLayoutAtoms::absoluteList == aListName, "unexpected child list name");
#ifdef NS_DEBUG
nsFrame::VerifyDirtyBitSet(aChildList);
#endif
mAbsoluteFrames.SetFrames(aChildList);
return NS_OK;
}
nsresult
nsAbsoluteContainingBlock::AppendFrames(nsIFrame* aDelegatingFrame,
nsIPresContext& aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aFrameList)
{
nsresult rv = NS_OK;
// Append the frames to our list of absolutely positioned frames
#ifdef NS_DEBUG
nsFrame::VerifyDirtyBitSet(aFrameList);
#endif
mAbsoluteFrames.AppendFrames(nsnull, aFrameList);
// Generate a reflow command to reflow the dirty frames
nsIReflowCommand* reflowCmd;
rv = NS_NewHTMLReflowCommand(&reflowCmd, aDelegatingFrame, nsIReflowCommand::ReflowDirty);
if (NS_SUCCEEDED(rv)) {
reflowCmd->SetChildListName(nsLayoutAtoms::absoluteList);
aPresShell.AppendReflowCommand(reflowCmd);
NS_RELEASE(reflowCmd);
}
return rv;
}
nsresult
nsAbsoluteContainingBlock::InsertFrames(nsIFrame* aDelegatingFrame,
nsIPresContext& aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsIFrame* aFrameList)
{
nsresult rv = NS_OK;
// Insert the new frames
#ifdef NS_DEBUG
nsFrame::VerifyDirtyBitSet(aFrameList);
#endif
mAbsoluteFrames.InsertFrames(nsnull, aPrevFrame, aFrameList);
// Generate a reflow command to reflow the dirty frames
nsIReflowCommand* reflowCmd;
rv = NS_NewHTMLReflowCommand(&reflowCmd, aDelegatingFrame, nsIReflowCommand::ReflowDirty);
if (NS_SUCCEEDED(rv)) {
reflowCmd->SetChildListName(nsLayoutAtoms::absoluteList);
aPresShell.AppendReflowCommand(reflowCmd);
NS_RELEASE(reflowCmd);
}
return rv;
}
nsresult
nsAbsoluteContainingBlock::RemoveFrame(nsIFrame* aDelegatingFrame,
nsIPresContext& aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aOldFrame)
{
PRBool result = mAbsoluteFrames.DestroyFrame(aPresContext, aOldFrame);
NS_ASSERTION(result, "didn't find frame to delete");
// Because positioned frames aren't part of a flow, there's no additional
// work to do, e.g. reflowing sibling frames. And because positioned frames
// have a view, we don't need to repaint
return result ? NS_OK : NS_ERROR_FAILURE;
}
nsresult
nsAbsoluteContainingBlock::Reflow(nsIFrame* aDelegatingFrame,
nsIPresContext& aPresContext,
const nsHTMLReflowState& aReflowState,
nscoord aContainingBlockWidth,
nscoord aContainingBlockHeight)
{
// 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(aDelegatingFrame, aPresContext, reflowState, aContainingBlockWidth,
aContainingBlockHeight, kidFrame, PR_FALSE, kidStatus);
}
return NS_OK;
}
nsresult
nsAbsoluteContainingBlock::IncrementalReflow(nsIFrame* aDelegatingFrame,
nsIPresContext& aPresContext,
const nsHTMLReflowState& aReflowState,
nscoord aContainingBlockWidth,
nscoord aContainingBlockHeight,
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 it's for the positioned child frames
aReflowState.reflowCommand->GetChildListName(listName);
isAbsoluteChild = nsLayoutAtoms::absoluteList == listName;
NS_IF_RELEASE(listName);
if (isAbsoluteChild) {
nsIReflowCommand::ReflowType type;
// Get the type of reflow command
aReflowState.reflowCommand->GetType(type);
// The only type of reflow command we expect is that we have dirty
// child frames to reflow
NS_ASSERTION(nsIReflowCommand::ReflowDirty, "unexpected reflow type");
// Walk the positioned frames and reflow the dirty frames
for (nsIFrame* f = mAbsoluteFrames.FirstChild(); f; f->GetNextSibling(&f)) {
nsFrameState frameState;
f->GetFrameState(&frameState);
if (frameState & NS_FRAME_IS_DIRTY) {
nsReflowStatus status;
// Note: the only reason the frame would be dirty would be if it had
// just been inserted or appended
NS_ASSERTION(frameState & NS_FRAME_FIRST_REFLOW, "unexpected frame state");
ReflowAbsoluteFrame(aDelegatingFrame, aPresContext, aReflowState,
aContainingBlockWidth, aContainingBlockHeight, f,
PR_TRUE, status);
}
}
// 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(aDelegatingFrame, aPresContext, aReflowState,
aContainingBlockWidth, aContainingBlockHeight, nextFrame,
PR_FALSE, kidStatus);
// We don't need to invalidate anything because the frame should
// invalidate any area within its frame that needs repainting, and
// because it has a view if it changes size the view manager will
// damage the dirty area
aWasHandled = PR_TRUE;
}
}
return NS_OK;
}
void
nsAbsoluteContainingBlock::DestroyFrames(nsIFrame* aDelegatingFrame,
nsIPresContext& aPresContext)
{
mAbsoluteFrames.DestroyFrames(aPresContext);
}
// 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(nsIFrame* aDelegatingFrame,
nsIPresContext& aPresContext,
const nsHTMLReflowState& aReflowState,
nscoord aContainingBlockWidth,
nscoord aContainingBlockHeight,
nsIFrame* aKidFrame,
PRBool aInitialReflow,
nsReflowStatus& aStatus)
{
nsresult rv;
nsMargin border;
// Get the border values
if (!aReflowState.mStyleSpacing->GetBorder(border)) {
NS_NOTYETIMPLEMENTED("percentage border");
}
nsIHTMLReflow* htmlReflow;
rv = aKidFrame->QueryInterface(kIHTMLReflowIID, (void**)&htmlReflow);
if (NS_SUCCEEDED(rv)) {
htmlReflow->WillReflow(aPresContext);
nsSize availSize(aReflowState.mComputedWidth, NS_UNCONSTRAINEDSIZE);
nsHTMLReflowMetrics kidDesiredSize(nsnull);
nsHTMLReflowState kidReflowState(aPresContext, aReflowState, aKidFrame,
availSize, aContainingBlockWidth,
aContainingBlockHeight);
// 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);
// Because we don't know the size of a replaced element until after we reflow
// it 'auto' margins must be computed now, and we need to take into account
// min-max information
if (NS_FRAME_IS_REPLACED(kidReflowState.mFrameType)) {
// Factor in any minimum and maximum size information
if (kidDesiredSize.width > kidReflowState.mComputedMaxWidth) {
kidDesiredSize.width = kidReflowState.mComputedMaxWidth;
} else if (kidDesiredSize.width < kidReflowState.mComputedMinWidth) {
kidDesiredSize.width = kidReflowState.mComputedMinWidth;
}
if (kidDesiredSize.height > kidReflowState.mComputedMaxHeight) {
kidDesiredSize.height = kidReflowState.mComputedMaxHeight;
} else if (kidDesiredSize.height < kidReflowState.mComputedMinHeight) {
kidDesiredSize.height = kidReflowState.mComputedMinHeight;
}
// Get the containing block width/height
nscoord containingBlockWidth, containingBlockHeight;
kidReflowState.ComputeContainingBlockRectangle(&aReflowState,
containingBlockWidth,
containingBlockHeight);
// XXX This code belongs in nsHTMLReflowState...
if ((NS_AUTOMARGIN == kidReflowState.mComputedMargin.left) ||
(NS_AUTOMARGIN == kidReflowState.mComputedMargin.right)) {
// Calculate the amount of space for margins
nscoord availMarginSpace = containingBlockWidth -
kidReflowState.mComputedOffsets.left - kidReflowState.mComputedBorderPadding.left -
kidDesiredSize.width - kidReflowState.mComputedBorderPadding.right -
kidReflowState.mComputedOffsets.right;
if (NS_AUTOMARGIN == kidReflowState.mComputedMargin.left) {
if (NS_AUTOMARGIN == kidReflowState.mComputedMargin.right) {
// Both 'margin-left' and 'margin-right' are 'auto', so they get
// equal values
kidReflowState.mComputedMargin.left = availMarginSpace / 2;
kidReflowState.mComputedMargin.right = availMarginSpace -
kidReflowState.mComputedMargin.left;
} else {
// Just 'margin-left' is 'auto'
kidReflowState.mComputedMargin.left = availMarginSpace -
kidReflowState.mComputedMargin.right;
}
} else {
// Just 'margin-right' is 'auto'
kidReflowState.mComputedMargin.right = availMarginSpace -
kidReflowState.mComputedMargin.left;
}
}
if ((NS_AUTOMARGIN == kidReflowState.mComputedMargin.top) ||
(NS_AUTOMARGIN == kidReflowState.mComputedMargin.bottom)) {
// Calculate the amount of space for margins
nscoord availMarginSpace = containingBlockHeight -
kidReflowState.mComputedOffsets.top - kidReflowState.mComputedBorderPadding.top -
kidDesiredSize.height - kidReflowState.mComputedBorderPadding.bottom -
kidReflowState.mComputedOffsets.bottom;
if (NS_AUTOMARGIN == kidReflowState.mComputedMargin.top) {
if (NS_AUTOMARGIN == kidReflowState.mComputedMargin.bottom) {
// Both 'margin-top' and 'margin-bottom' are 'auto', so they get
// equal values
kidReflowState.mComputedMargin.top = availMarginSpace / 2;
kidReflowState.mComputedMargin.bottom = availMarginSpace -
kidReflowState.mComputedMargin.top;
} else {
// Just 'margin-top' is 'auto'
kidReflowState.mComputedMargin.top = availMarginSpace -
kidReflowState.mComputedMargin.bottom;
}
} else {
// Just 'margin-bottom' is 'auto'
kidReflowState.mComputedMargin.bottom = availMarginSpace -
kidReflowState.mComputedMargin.top;
}
}
}
// XXX If the child had a fixed height, then make sure it respected it...
if (NS_AUTOHEIGHT != kidReflowState.mComputedHeight) {
if (kidDesiredSize.height < kidReflowState.mComputedHeight) {
kidDesiredSize.height = kidReflowState.mComputedHeight;
kidDesiredSize.height += kidReflowState.mComputedBorderPadding.top +
kidReflowState.mComputedBorderPadding.bottom;
}
}
// Position the child relative to our padding edge
nsRect rect(border.left + kidReflowState.mComputedOffsets.left + kidReflowState.mComputedMargin.left,
border.top + kidReflowState.mComputedOffsets.top + kidReflowState.mComputedMargin.top,
kidDesiredSize.width, kidDesiredSize.height);
aKidFrame->SetRect(rect);
}
return rv;
}
nsresult
nsAbsoluteContainingBlock::GetPositionedInfo(const nsIFrame* aDelegatingFrame,
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;
}