gecko-dev/layout/generic/nsAbsoluteContainingBlock.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape Public License
* Version 1.1 (the "License"); you may not use this file except in
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*
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* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
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* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
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* Contributor(s):
*
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* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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#include "nsCOMPtr.h"
#include "nsAbsoluteContainingBlock.h"
#include "nsContainerFrame.h"
#include "nsReflowPath.h"
#include "nsIViewManager.h"
#include "nsLayoutAtoms.h"
#include "nsIPresShell.h"
#include "nsHTMLParts.h"
#include "nsIPresContext.h"
#ifdef DEBUG
#include "nsBlockFrame.h"
#endif
nsresult
nsAbsoluteContainingBlock::FirstChild(const nsIFrame* aDelegatingFrame,
nsIAtom* aListName,
nsIFrame** aFirstChild) const
{
NS_PRECONDITION(GetChildListName() == aListName, "unexpected child list name");
*aFirstChild = mAbsoluteFrames.FirstChild();
return NS_OK;
}
nsresult
nsAbsoluteContainingBlock::SetInitialChildList(nsIFrame* aDelegatingFrame,
nsIPresContext* aPresContext,
nsIAtom* aListName,
nsIFrame* aChildList)
{
NS_PRECONDITION(GetChildListName() == 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
nsHTMLReflowCommand* reflowCmd;
rv = NS_NewHTMLReflowCommand(&reflowCmd, aDelegatingFrame, eReflowType_ReflowDirty);
if (NS_SUCCEEDED(rv)) {
reflowCmd->SetChildListName(GetChildListName());
aPresShell.AppendReflowCommand(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
nsHTMLReflowCommand* reflowCmd;
rv = NS_NewHTMLReflowCommand(&reflowCmd, aDelegatingFrame, eReflowType_ReflowDirty);
if (NS_SUCCEEDED(rv)) {
reflowCmd->SetChildListName(GetChildListName());
aPresShell.AppendReflowCommand(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::ReplaceFrame(nsIFrame* aDelegatingFrame,
nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aOldFrame,
nsIFrame* aNewFrame)
{
PRBool result = mAbsoluteFrames.ReplaceFrame(aPresContext, aDelegatingFrame,
aOldFrame, aNewFrame, PR_TRUE);
NS_ASSERTION(result, "Problems replacing a frame");
return result ? NS_OK : NS_ERROR_FAILURE;
}
nsresult
nsAbsoluteContainingBlock::Reflow(nsIFrame* aDelegatingFrame,
nsIPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
nscoord aContainingBlockWidth,
nscoord aContainingBlockHeight,
nsRect* aChildBounds)
{
// Initialize OUT parameter
if (aChildBounds)
aChildBounds->SetRect(0, 0, 0, 0);
// Make a copy of the reflow state. If the reason is
// eReflowReason_Incremental (which should mean either that the target
// is the frame for which this is the absolute container or that the
// container changed size due to incremental reflow of its children),
// then change it to eReflowReason_Resize.
// XXXldb If the target is this frame, shouldn't we be setting it
// appropriately (which might mean to StyleChanged)?
nsHTMLReflowState reflowState(aReflowState);
if (eReflowReason_Incremental == reflowState.reason) {
reflowState.reason = eReflowReason_Resize;
}
nsIFrame* kidFrame;
for (kidFrame = mAbsoluteFrames.FirstChild(); kidFrame; kidFrame = kidFrame->GetNextSibling()) {
nsReflowReason reason = reflowState.reason;
nsFrameState kidState = kidFrame->GetStateBits();
if (NS_FRAME_FIRST_REFLOW & kidState) {
// The frame has never had a reflow, so change the reason to eReflowReason_Initial
reason = eReflowReason_Initial;
} else if (NS_FRAME_IS_DIRTY & kidState) {
// The frame is dirty so give it the correct reflow reason
reason = eReflowReason_Dirty;
}
// Reflow the frame
nsReflowStatus kidStatus;
ReflowAbsoluteFrame(aDelegatingFrame, aPresContext, reflowState, aContainingBlockWidth,
aContainingBlockHeight, kidFrame, reason, kidStatus);
if (aChildBounds) {
// Add in the child's bounds
nsRect kidBounds = kidFrame->GetRect();
aChildBounds->UnionRect(*aChildBounds, kidBounds);
// If the frame has visible overflow, then take it into account, too.
if (kidFrame->GetStateBits() & NS_FRAME_OUTSIDE_CHILDREN) {
// Get the property
nsRect* overflowArea = kidFrame->GetOverflowAreaProperty(aPresContext);
if (overflowArea) {
// The overflow area is in the child's coordinate space, so translate
// it into the parent's coordinate space
nsRect rect(*overflowArea);
rect.MoveBy(kidBounds.x, kidBounds.y);
aChildBounds->UnionRect(*aChildBounds, rect);
}
}
}
}
return NS_OK;
}
void
nsAbsoluteContainingBlock::CalculateChildBounds(nsIPresContext* aPresContext,
nsRect& aChildBounds)
{
// Initialize the OUT parameters
aChildBounds.SetRect(0, 0, 0, 0);
for (nsIFrame* f = mAbsoluteFrames.FirstChild(); f; f = f->GetNextSibling()) {
// Add in the child's bounds
nsRect bounds = f->GetRect();
aChildBounds.UnionRect(aChildBounds, bounds);
// If the frame has visible overflow, then take it into account, too.
if (f->GetStateBits() & NS_FRAME_OUTSIDE_CHILDREN) {
// Get the property
nsRect* overflowArea = f->GetOverflowAreaProperty(aPresContext);
if (overflowArea) {
// The overflow area is in the child's coordinate space, so translate
// it into the parent's coordinate space
nsRect rect(*overflowArea);
rect.MoveBy(bounds.x, bounds.y);
aChildBounds.UnionRect(aChildBounds, rect);
}
}
}
}
nsresult
nsAbsoluteContainingBlock::IncrementalReflow(nsIFrame* aDelegatingFrame,
nsIPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
nscoord aContainingBlockWidth,
nscoord aContainingBlockHeight,
PRBool& aWasHandled)
{
// Initialize the OUT parameters
// Assume we handled the incremental reflow
// until we find something that requires a full block reflow
aWasHandled = PR_TRUE;
// See if the reflow command is targeted at us.
nsReflowPath *path = aReflowState.path;
nsHTMLReflowCommand *command = path->mReflowCommand;
if (command) {
// It's targeted at us. See if it's for the positioned child frames
nsCOMPtr<nsIAtom> listName;
command->GetChildListName(*getter_AddRefs(listName));
if (GetChildListName() == listName) {
nsReflowType type;
// Get the type of reflow command
command->GetType(type);
// The only type of reflow command we expect is that we have dirty
// child frames to reflow
NS_ASSERTION(type == eReflowType_ReflowDirty, "unexpected reflow type");
// Walk the positioned frames and reflow the dirty frames
for (nsIFrame* f = mAbsoluteFrames.FirstChild(); f; f = f->GetNextSibling()) {
nsFrameState frameState = f->GetStateBits();
if (frameState & NS_FRAME_IS_DIRTY) {
nsReflowStatus status;
nsReflowReason reason;
reason = (frameState & NS_FRAME_FIRST_REFLOW)
? eReflowReason_Initial
: eReflowReason_Dirty;
ReflowAbsoluteFrame(aDelegatingFrame, aPresContext, aReflowState,
aContainingBlockWidth, aContainingBlockHeight, f,
reason, status);
}
}
} else {
// A reflow command is targeted directly at this block.
// The block will have to do a proper reflow.
// But keep going to make sure that we process any dirty absolute frames, below.
aWasHandled = PR_FALSE;
}
}
nsReflowPath::iterator iter = path->FirstChild();
nsReflowPath::iterator end = path->EndChildren();
if (iter != end && mAbsoluteFrames.NotEmpty()) {
for ( ; iter != end; ++iter) {
// See if it's one of our absolutely positioned child frames
if (mAbsoluteFrames.ContainsFrame(*iter)) {
// Remove the next frame from the reflow path
nsReflowStatus kidStatus;
ReflowAbsoluteFrame(aDelegatingFrame, aPresContext, aReflowState,
aContainingBlockWidth, aContainingBlockHeight, *iter,
aReflowState.reason, 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
// Prune the path so we don't flow the block frame _again_
// when returning to the caller.
aReflowState.path->Remove(iter);
}
else {
// At least one of the frames along the reflow path wasn't
// absolutely positioned, so we'll need to deal with it in
// normal block reflow.
aWasHandled = PR_FALSE;
}
}
}
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...
// When bug 154892 is checked in, make sure that when
// GetChildListName() == nsLayoutAtoms::fixedList, the height is unconstrained.
// since we don't allow replicated frames to split.
nsresult
nsAbsoluteContainingBlock::ReflowAbsoluteFrame(nsIFrame* aDelegatingFrame,
nsIPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
nscoord aContainingBlockWidth,
nscoord aContainingBlockHeight,
nsIFrame* aKidFrame,
nsReflowReason aReason,
nsReflowStatus& aStatus)
{
#ifdef DEBUG
if (nsBlockFrame::gNoisyReflow) {
nsFrame::IndentBy(stdout,nsBlockFrame::gNoiseIndent);
printf("abs pos ");
if (nsnull != aKidFrame) {
nsIFrameDebug* frameDebug;
if (NS_SUCCEEDED(CallQueryInterface(aKidFrame, &frameDebug))) {
nsAutoString name;
frameDebug->GetFrameName(name);
printf("%s ", NS_LossyConvertUCS2toASCII(name).get());
}
}
printf("r=%d",aReflowState.reason);
if (aReflowState.reason == eReflowReason_Incremental) {
nsHTMLReflowCommand *command = aReflowState.path->mReflowCommand;
if (command) {
// We're the target.
nsReflowType type;
command->GetType(type);
printf("(%d)", type);
}
}
char width[16];
char height[16];
PrettyUC(aReflowState.availableWidth, width);
PrettyUC(aReflowState.availableHeight, height);
printf(" a=%s,%s ", width, height);
PrettyUC(aReflowState.mComputedWidth, width);
PrettyUC(aReflowState.mComputedHeight, height);
printf("c=%s,%s \n", width, height);
}
if (nsBlockFrame::gNoisy) {
nsBlockFrame::gNoiseIndent++;
}
#endif // DEBUG
nsresult rv;
nsMargin border;
// Get the border values
if (!aReflowState.mStyleBorder->GetBorder(border)) {
NS_NOTYETIMPLEMENTED("percentage border");
}
nsSize availSize(aReflowState.mComputedWidth, NS_UNCONSTRAINEDSIZE);
nsHTMLReflowMetrics kidDesiredSize(nsnull);
nsHTMLReflowState kidReflowState(aPresContext, aReflowState, aKidFrame,
availSize, aContainingBlockWidth,
aContainingBlockHeight,
aReason);
// Send the WillReflow() notification and position the frame
aKidFrame->WillReflow(aPresContext);
// XXXldb We can simplify this if we come up with a better way to
// position views.
nscoord x;
if (NS_AUTOOFFSET == kidReflowState.mComputedOffsets.left) {
// Just use the current x-offset
x = aKidFrame->GetPosition().x;
} else {
x = border.left + kidReflowState.mComputedOffsets.left + kidReflowState.mComputedMargin.left;
}
aKidFrame->SetPosition(nsPoint(x, border.top + kidReflowState.mComputedOffsets.top + kidReflowState.mComputedMargin.top));
// Position its view, but don't bother it doing it now if we haven't
// yet determined the left offset
if (NS_AUTOOFFSET != kidReflowState.mComputedOffsets.left) {
nsContainerFrame::PositionFrameView(aPresContext, aKidFrame);
}
// Do the reflow
rv = aKidFrame->Reflow(aPresContext, kidDesiredSize, kidReflowState, aStatus);
// If we're solving for 'left' or 'top', then compute it now that we know the
// width/height
if ((NS_AUTOOFFSET == kidReflowState.mComputedOffsets.left) ||
(NS_AUTOOFFSET == kidReflowState.mComputedOffsets.top)) {
if (-1 == aContainingBlockWidth) {
// Get the containing block width/height
kidReflowState.ComputeContainingBlockRectangle(aPresContext,
&aReflowState,
aContainingBlockWidth,
aContainingBlockHeight);
}
if (NS_AUTOOFFSET == kidReflowState.mComputedOffsets.left) {
kidReflowState.mComputedOffsets.left = aContainingBlockWidth -
kidReflowState.mComputedOffsets.right -
kidReflowState.mComputedMargin.right -
kidDesiredSize.width -
kidReflowState.mComputedMargin.left;
}
if (NS_AUTOOFFSET == kidReflowState.mComputedOffsets.top) {
kidReflowState.mComputedOffsets.top = aContainingBlockHeight -
kidReflowState.mComputedOffsets.bottom -
kidReflowState.mComputedMargin.bottom -
kidDesiredSize.height -
kidReflowState.mComputedMargin.top;
}
}
// 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);
// Size and position the view and set its opacity, visibility, content
// transparency, and clip
nsContainerFrame::SyncFrameViewAfterReflow(aPresContext, aKidFrame,
aKidFrame->GetView(),
&kidDesiredSize.mOverflowArea);
aKidFrame->DidReflow(aPresContext, &kidReflowState, NS_FRAME_REFLOW_FINISHED);
// If the frame has visible overflow, then store it as a property on the
// frame. This allows us to be able to recover it without having to reflow
// the frame
if (aKidFrame->GetStateBits() & NS_FRAME_OUTSIDE_CHILDREN) {
// Get the property (creating a rect struct if necessary)
nsRect* overflowArea = aKidFrame->GetOverflowAreaProperty(aPresContext, PR_TRUE);
NS_ASSERTION(overflowArea, "should have created rect");
if (overflowArea) {
*overflowArea = kidDesiredSize.mOverflowArea;
}
}
#ifdef DEBUG
if (nsBlockFrame::gNoisy) {
nsBlockFrame::gNoiseIndent--;
}
if (nsBlockFrame::gNoisyReflow) {
nsFrame::IndentBy(stdout,nsBlockFrame::gNoiseIndent);
printf("abs pos ");
if (nsnull != aKidFrame) {
nsIFrameDebug* frameDebug;
if (NS_SUCCEEDED(CallQueryInterface(aKidFrame, &frameDebug))) {
nsAutoString name;
frameDebug->GetFrameName(name);
printf("%s ", NS_LossyConvertUCS2toASCII(name).get());
}
}
printf("%p rect=%d,%d,%d,%d", aKidFrame, rect.x, rect.y, rect.width, rect.height);
printf("\n");
}
#endif
return rv;
}
#ifdef DEBUG
void nsAbsoluteContainingBlock::PrettyUC(nscoord aSize,
char* aBuf)
{
if (NS_UNCONSTRAINEDSIZE == aSize) {
strcpy(aBuf, "UC");
}
else {
if(0xdeadbeef == aSize)
{
strcpy(aBuf, "deadbeef");
}
else {
sprintf(aBuf, "%d", aSize);
}
}
}
#endif