gecko-dev/layout/generic/nsAbsoluteContainingBlock.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* 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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*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* 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
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* 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"),
* in which case the provisions of the GPL or the LGPL are applicable instead
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* ***** END LICENSE BLOCK ***** */
#include "nsCOMPtr.h"
#include "nsAbsoluteContainingBlock.h"
#include "nsContainerFrame.h"
#include "nsReflowPath.h"
#include "nsIStyleContext.h"
#include "nsIViewManager.h"
#include "nsLayoutAtoms.h"
#include "nsIPresShell.h"
#include "nsHTMLParts.h"
#include "nsIPresContext.h"
#include "nsIFrameManager.h"
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
nsHTMLReflowCommand* reflowCmd;
rv = NS_NewHTMLReflowCommand(&reflowCmd, aDelegatingFrame, eReflowType_ReflowDirty);
if (NS_SUCCEEDED(rv)) {
reflowCmd->SetChildListName(nsLayoutAtoms::absoluteList);
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(nsLayoutAtoms::absoluteList);
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;
}
// Destructor function for the collapse offset frame property
static void
DestroyRectFunc(nsIPresContext* aPresContext,
nsIFrame* aFrame,
nsIAtom* aPropertyName,
void* aPropertyValue)
{
delete (nsRect*)aPropertyValue;
}
static nsRect*
GetOverflowAreaProperty(nsIPresContext* aPresContext,
nsIFrame* aFrame,
PRBool aCreateIfNecessary = PR_FALSE)
{
nsCOMPtr<nsIPresShell> presShell;
aPresContext->GetShell(getter_AddRefs(presShell));
if (presShell) {
nsCOMPtr<nsIFrameManager> frameManager;
presShell->GetFrameManager(getter_AddRefs(frameManager));
if (frameManager) {
void* value;
frameManager->GetFrameProperty(aFrame, nsLayoutAtoms::overflowAreaProperty,
0, &value);
if (value) {
return (nsRect*)value; // the property already exists
} else if (aCreateIfNecessary) {
// The property isn't set yet, so allocate a new rect, set the property,
// and return the newly allocated rect
nsRect* overflow = new nsRect(0, 0, 0, 0);
frameManager->SetFrameProperty(aFrame, nsLayoutAtoms::overflowAreaProperty,
overflow, DestroyRectFunc);
return overflow;
}
}
}
return nsnull;
}
nsresult
nsAbsoluteContainingBlock::Reflow(nsIFrame* aDelegatingFrame,
nsIPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
nscoord aContainingBlockWidth,
nscoord aContainingBlockHeight,
nsRect& aChildBounds)
{
// Initialize OUT parameter
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.
nsHTMLReflowState reflowState(aReflowState);
if (eReflowReason_Incremental == reflowState.reason) {
reflowState.reason = eReflowReason_Resize;
}
nsIFrame* kidFrame;
for (kidFrame = mAbsoluteFrames.FirstChild(); nsnull != kidFrame; kidFrame->GetNextSibling(&kidFrame)) {
nsReflowReason reason = reflowState.reason;
nsFrameState kidState;
kidFrame->GetFrameState(&kidState);
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);
// Add in the child's bounds
nsRect kidBounds;
kidFrame->GetRect(kidBounds);
aChildBounds.UnionRect(aChildBounds, kidBounds);
// If the frame has visible overflow, then take it into account, too.
nsFrameState kidFrameState;
kidFrame->GetFrameState(&kidFrameState);
if (kidFrameState & NS_FRAME_OUTSIDE_CHILDREN) {
// Get the property
nsRect* overflowArea = ::GetOverflowAreaProperty(aPresContext, kidFrame);
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)
{
for (nsIFrame* f = mAbsoluteFrames.FirstChild(); f; f->GetNextSibling(&f)) {
// Add in the child's bounds
nsRect bounds;
f->GetRect(bounds);
aChildBounds.UnionRect(aChildBounds, bounds);
// If the frame has visible overflow, then take it into account, too.
nsFrameState frameState;
f->GetFrameState(&frameState);
if (frameState & NS_FRAME_OUTSIDE_CHILDREN) {
// Get the property
nsRect* overflowArea = ::GetOverflowAreaProperty(aPresContext, f);
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,
nsRect& aChildBounds)
{
// Initialize the OUT paremeters
aWasHandled = PR_FALSE;
aChildBounds.SetRect(0, 0, 0, 0);
// 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 (nsLayoutAtoms::absoluteList == 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(eReflowType_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;
nsReflowReason reason;
reason = (frameState & NS_FRAME_FIRST_REFLOW)
? eReflowReason_Initial
: eReflowReason_Dirty;
ReflowAbsoluteFrame(aDelegatingFrame, aPresContext, aReflowState,
aContainingBlockWidth, aContainingBlockHeight, f,
reason, status);
}
}
// Indicate we handled the reflow command.
aWasHandled = PR_TRUE;
// Calculate the total child bounds.
CalculateChildBounds(aPresContext, aChildBounds);
}
}
nsReflowPath::iterator iter = path->FirstChild();
nsReflowPath::iterator end = path->EndChildren();
if (iter != end && mAbsoluteFrames.NotEmpty()) {
// One of our children has been targeted for reflow. By default,
// assume we've handled it.
aWasHandled = PR_TRUE;
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
// Calculate the total child bounds
CalculateChildBounds(aPresContext, aChildBounds);
// 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);
}
/**
* NOTE: nsViewportFrame::ReflowFixedFrame is rather similar to this
* function, so changes made here may also need to be made there.
*/
// 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,
nsReflowReason aReason,
nsReflowStatus& aStatus)
{
nsresult rv;
nsMargin border;
// Get the border values
if (!aReflowState.mStyleBorder->GetBorder(border)) {
NS_NOTYETIMPLEMENTED("percentage border");
}
nsFrameState kidFrameState;
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
nsPoint origin;
aKidFrame->GetOrigin(origin);
x = origin.x;
} else {
x = border.left + kidReflowState.mComputedOffsets.left + kidReflowState.mComputedMargin.left;
}
aKidFrame->MoveTo(aPresContext,
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(aPresContext, rect);
// Size and position the view and set its opacity, visibility, content
// transparency, and clip
nsIView* kidView;
aKidFrame->GetView(aPresContext, &kidView);
nsContainerFrame::SyncFrameViewAfterReflow(aPresContext, aKidFrame, kidView,
&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
aKidFrame->GetFrameState(&kidFrameState);
if (kidFrameState & NS_FRAME_OUTSIDE_CHILDREN) {
// Get the property (creating a rect struct if necessary)
nsRect* overflowArea = ::GetOverflowAreaProperty(aPresContext, aKidFrame, PR_TRUE);
if (overflowArea) {
*overflowArea = kidDesiredSize.mOverflowArea;
}
}
return rv;
}