pjs/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: MPL 1.1/GPL 2.0/LGPL 2.1
*
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*
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* for the specific language governing rights and limitations under the
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*
* 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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*
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/*
* code for managing absolutely positioned children of a rendering
* object that is a containing block for them
*/
#include "nsCOMPtr.h"
#include "nsAbsoluteContainingBlock.h"
#include "nsContainerFrame.h"
#include "nsIPresShell.h"
#include "nsHTMLParts.h"
#include "nsPresContext.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,
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,
nsIAtom* aListName,
nsIFrame* aFrameList)
{
NS_ASSERTION(GetChildListName() == aListName, "unexpected child list");
// Append the frames to our list of absolutely positioned frames
#ifdef NS_DEBUG
nsFrame::VerifyDirtyBitSet(aFrameList);
#endif
mAbsoluteFrames.AppendFrames(nsnull, aFrameList);
aDelegatingFrame->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
// no damage to intrinsic widths, since absolutely positioned frames can't
// change them
return aDelegatingFrame->GetPresContext()->PresShell()->
FrameNeedsReflow(aDelegatingFrame, nsIPresShell::eResize);
}
nsresult
nsAbsoluteContainingBlock::InsertFrames(nsIFrame* aDelegatingFrame,
nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsIFrame* aFrameList)
{
NS_ASSERTION(GetChildListName() == aListName, "unexpected child list");
NS_ASSERTION(!aPrevFrame || aPrevFrame->GetParent() == aDelegatingFrame,
"inserting after sibling frame with different parent");
#ifdef NS_DEBUG
nsFrame::VerifyDirtyBitSet(aFrameList);
#endif
mAbsoluteFrames.InsertFrames(nsnull, aPrevFrame, aFrameList);
aDelegatingFrame->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
// no damage to intrinsic widths, since absolutely positioned frames can't
// change them
return aDelegatingFrame->GetPresContext()->PresShell()->
FrameNeedsReflow(aDelegatingFrame, nsIPresShell::eResize);
}
nsresult
nsAbsoluteContainingBlock::RemoveFrame(nsIFrame* aDelegatingFrame,
nsIAtom* aListName,
nsIFrame* aOldFrame)
{
NS_ASSERTION(GetChildListName() == aListName, "unexpected child list");
PRBool result = mAbsoluteFrames.DestroyFrame(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;
}
static void
AddFrameToChildBounds(nsIFrame* aKidFrame, nsRect* aChildBounds)
{
NS_PRECONDITION(aKidFrame, "Must have kid frame");
if (!aChildBounds) {
return;
}
// Add in the child's bounds
nsRect kidBounds = aKidFrame->GetRect();
nsRect* kidOverflow = aKidFrame->GetOverflowAreaProperty();
if (kidOverflow) {
// Put it in the parent's coordinate system
kidBounds = *kidOverflow + kidBounds.TopLeft();
}
aChildBounds->UnionRect(*aChildBounds, kidBounds);
}
nsresult
nsAbsoluteContainingBlock::Reflow(nsIFrame* aDelegatingFrame,
nsPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
nscoord aContainingBlockWidth,
nscoord aContainingBlockHeight,
PRBool aCBWidthChanged,
PRBool aCBHeightChanged,
nsRect* aChildBounds)
{
// Initialize OUT parameter
if (aChildBounds)
aChildBounds->SetRect(0, 0, 0, 0);
PRBool reflowAll = aReflowState.ShouldReflowAllKids();
nsIFrame* kidFrame;
for (kidFrame = mAbsoluteFrames.FirstChild(); kidFrame; kidFrame = kidFrame->GetNextSibling()) {
if (reflowAll ||
(kidFrame->GetStateBits() &
(NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN)) ||
FrameDependsOnContainer(kidFrame, aCBWidthChanged, aCBHeightChanged)) {
// Reflow the frame
nsReflowStatus kidStatus;
ReflowAbsoluteFrame(aDelegatingFrame, aPresContext, aReflowState, aContainingBlockWidth,
aContainingBlockHeight, kidFrame, kidStatus);
}
AddFrameToChildBounds(kidFrame, aChildBounds);
}
return NS_OK;
}
static PRBool IsFixedPaddingSize(nsStyleUnit aUnit) {
return aUnit == eStyleUnit_Coord || aUnit == eStyleUnit_Null;
}
static PRBool IsFixedMarginSize(nsStyleUnit aUnit) {
return aUnit == eStyleUnit_Coord || aUnit == eStyleUnit_Null;
}
static PRBool IsFixedMaxSize(nsStyleUnit aUnit) {
return aUnit == eStyleUnit_Null || aUnit == eStyleUnit_Coord;
}
PRBool
nsAbsoluteContainingBlock::FrameDependsOnContainer(nsIFrame* f,
PRBool aCBWidthChanged,
PRBool aCBHeightChanged)
{
const nsStylePosition* pos = f->GetStylePosition();
// See if f's position might have changed because it depends on a
// placeholder's position
// This can happen in the following cases:
// 1) Vertical positioning. "top" must be auto and "bottom" must be auto
// (otherwise the vertical position is completely determined by
// whichever of them is not auto and the height).
// 2) Horizontal positioning. "left" must be auto and "right" must be auto
// (otherwise the horizontal position is completely determined by
// whichever of them is not auto and the width).
// See nsHTMLReflowState::InitAbsoluteConstraints -- these are the
// only cases when we call CalculateHypotheticalBox().
if ((pos->mOffset.GetTopUnit() == eStyleUnit_Auto &&
pos->mOffset.GetBottomUnit() == eStyleUnit_Auto) ||
(pos->mOffset.GetLeftUnit() == eStyleUnit_Auto &&
pos->mOffset.GetRightUnit() == eStyleUnit_Auto)) {
return PR_TRUE;
}
if (!aCBWidthChanged && !aCBHeightChanged) {
// skip getting style data
return PR_FALSE;
}
const nsStylePadding* padding = f->GetStylePadding();
const nsStyleMargin* margin = f->GetStyleMargin();
if (aCBWidthChanged) {
// See if f's width might have changed.
// If border-left, border-right, padding-left, padding-right,
// width, min-width, and max-width are all lengths, 'none', or enumerated,
// then our frame width does not depend on the parent width.
// Note that borders never depend on the parent width
if (pos->mWidth.GetUnit() != eStyleUnit_Coord ||
pos->mMinWidth.GetUnit() != eStyleUnit_Coord ||
!IsFixedMaxSize(pos->mMaxWidth.GetUnit()) ||
!IsFixedPaddingSize(padding->mPadding.GetLeftUnit()) ||
!IsFixedPaddingSize(padding->mPadding.GetRightUnit())) {
return PR_TRUE;
}
// See if f's position might have changed. If we're RTL then the
// rules are slightly different. We'll assume percentage or auto
// margins will always induce a dependency on the size
if (!IsFixedMarginSize(margin->mMargin.GetLeftUnit()) ||
!IsFixedMarginSize(margin->mMargin.GetRightUnit())) {
return PR_TRUE;
}
if (f->GetStyleVisibility()->mDirection == NS_STYLE_DIRECTION_RTL) {
// Note that even if 'left' is a length, our position can
// still depend on the containing block width, because if
// 'right' is also a length we will discard 'left' and be
// positioned relative to the containing block right edge.
// 'left' length and 'right' auto is the only combination
// we can be sure of.
if (pos->mOffset.GetLeftUnit() != eStyleUnit_Coord ||
pos->mOffset.GetRightUnit() != eStyleUnit_Auto) {
return PR_TRUE;
}
} else {
if (pos->mOffset.GetLeftUnit() != eStyleUnit_Coord) {
return PR_TRUE;
}
}
}
if (aCBHeightChanged) {
// See if f's height might have changed.
// If border-top, border-bottom, padding-top, padding-bottom,
// min-height, and max-height are all lengths or 'none',
// and height is a length or height and bottom are auto and top is not auto,
// then our frame height does not depend on the parent height.
// Note that borders never depend on the parent height
if (!(pos->mHeight.GetUnit() == eStyleUnit_Coord ||
(pos->mHeight.GetUnit() == eStyleUnit_Auto &&
pos->mOffset.GetBottomUnit() == eStyleUnit_Auto &&
pos->mOffset.GetTopUnit() != eStyleUnit_Auto)) ||
pos->mMinHeight.GetUnit() != eStyleUnit_Coord ||
!IsFixedMaxSize(pos->mMaxHeight.GetUnit()) ||
!IsFixedPaddingSize(padding->mPadding.GetTopUnit()) ||
!IsFixedPaddingSize(padding->mPadding.GetBottomUnit())) {
return PR_TRUE;
}
// See if f's position might have changed.
if (!IsFixedMarginSize(margin->mMargin.GetTopUnit()) ||
!IsFixedMarginSize(margin->mMargin.GetBottomUnit())) {
return PR_TRUE;
}
if (pos->mOffset.GetTopUnit() != eStyleUnit_Coord) {
return PR_TRUE;
}
}
return PR_FALSE;
}
void
nsAbsoluteContainingBlock::DestroyFrames(nsIFrame* aDelegatingFrame)
{
mAbsoluteFrames.DestroyFrames();
}
// 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() == nsGkAtoms::fixedList, the height is unconstrained.
// since we don't allow replicated frames to split.
nsresult
nsAbsoluteContainingBlock::ReflowAbsoluteFrame(nsIFrame* aDelegatingFrame,
nsPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
nscoord aContainingBlockWidth,
nscoord aContainingBlockHeight,
nsIFrame* aKidFrame,
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_LossyConvertUTF16toASCII(name).get());
}
}
char width[16];
char height[16];
PrettyUC(aReflowState.availableWidth, width);
PrettyUC(aReflowState.availableHeight, height);
printf(" a=%s,%s ", width, height);
PrettyUC(aReflowState.ComputedWidth(), width);
PrettyUC(aReflowState.mComputedHeight, height);
printf("c=%s,%s \n", width, height);
}
AutoNoisyIndenter indent(nsBlockFrame::gNoisy);
#endif // DEBUG
// Store position and overflow rect so taht we can invalidate the correct
// area if the position changes
nsRect oldOverflowRect(aKidFrame->GetOverflowRect() +
aKidFrame->GetPosition());
nsRect oldRect = aKidFrame->GetRect();
nsresult rv;
// Get the border values
const nsMargin& border = aReflowState.mStyleBorder->GetBorder();
nscoord availWidth = aContainingBlockWidth;
if (availWidth == -1) {
NS_ASSERTION(aReflowState.ComputedWidth() != NS_UNCONSTRAINEDSIZE,
"Must have a useful width _somewhere_");
availWidth =
aReflowState.ComputedWidth() + aReflowState.mComputedPadding.LeftRight();
}
nsHTMLReflowMetrics kidDesiredSize;
nsHTMLReflowState kidReflowState(aPresContext, aReflowState, aKidFrame,
nsSize(availWidth, NS_UNCONSTRAINEDSIZE),
aContainingBlockWidth,
aContainingBlockHeight);
// 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));
// 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) {
NS_ASSERTION(NS_AUTOOFFSET != kidReflowState.mComputedOffsets.right,
"Can't solve for both left and right");
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);
if (oldRect.TopLeft() != rect.TopLeft() ||
(aDelegatingFrame->GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
// The frame moved; we have to invalidate the whole frame
// because the children may have moved after they were reflowed
// XXX This could be optimized in some cases, like repositioning and
// clipping
aKidFrame->GetParent()->Invalidate(oldOverflowRect);
aKidFrame->GetParent()->Invalidate(kidDesiredSize.mOverflowArea +
rect.TopLeft());
} else if (oldRect.Size() != rect.Size()) {
// Invalidate the area where the frame changed size.
nscoord innerWidth = PR_MIN(oldRect.width, rect.width);
nscoord innerHeight = PR_MIN(oldRect.height, rect.height);
nscoord outerWidth = PR_MAX(oldRect.width, rect.width);
nscoord outerHeight = PR_MAX(oldRect.height, rect.height);
aKidFrame->GetParent()->Invalidate(
nsRect(rect.x + innerWidth, rect.y, outerWidth - innerWidth, outerHeight));
// Invalidate the horizontal strip
aKidFrame->GetParent()->Invalidate(
nsRect(rect.x, rect.y + innerHeight, outerWidth, outerHeight - innerHeight));
}
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(PR_TRUE);
NS_ASSERTION(overflowArea, "should have created rect");
if (overflowArea) {
*overflowArea = kidDesiredSize.mOverflowArea;
}
}
#ifdef DEBUG
if (nsBlockFrame::gNoisyReflow) {
nsFrame::IndentBy(stdout,nsBlockFrame::gNoiseIndent - 1);
printf("abs pos ");
if (nsnull != aKidFrame) {
nsIFrameDebug* frameDebug;
if (NS_SUCCEEDED(CallQueryInterface(aKidFrame, &frameDebug))) {
nsAutoString name;
frameDebug->GetFrameName(name);
printf("%s ", NS_LossyConvertUTF16toASCII(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((PRInt32)0xdeadbeef == aSize)
{
strcpy(aBuf, "deadbeef");
}
else {
sprintf(aBuf, "%d", aSize);
}
}
}
#endif