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gecko-dev/layout/generic/nsContainerFrame.cpp
mats.palmgren%bredband.net a9e4efa770 Removed a bogus assertion. b=345699 r+sr=roc
2006-07-28 09:18:27 +00:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* 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):
* Pierre Phaneuf <pp@ludusdesign.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of 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
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* base class #1 for rendering objects that have child lists */
#include "nsContainerFrame.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsPresContext.h"
#include "nsIRenderingContext.h"
#include "nsStyleContext.h"
#include "nsRect.h"
#include "nsPoint.h"
#include "nsGUIEvent.h"
#include "nsStyleConsts.h"
#include "nsIView.h"
#include "nsIScrollableView.h"
#include "nsHTMLContainerFrame.h"
#include "nsFrameManager.h"
#include "nsIPresShell.h"
#include "nsCOMPtr.h"
#include "nsLayoutAtoms.h"
#include "nsCSSAnonBoxes.h"
#include "nsIViewManager.h"
#include "nsIWidget.h"
#include "nsGfxCIID.h"
#include "nsIServiceManager.h"
#include "nsCSSRendering.h"
#include "nsTransform2D.h"
#include "nsRegion.h"
#include "nsLayoutErrors.h"
#include "nsDisplayList.h"
#include "nsContentErrors.h"
#ifdef NS_DEBUG
#undef NOISY
#else
#undef NOISY
#endif
nsContainerFrame::~nsContainerFrame()
{
}
NS_IMETHODIMP
nsContainerFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
nsresult rv = nsSplittableFrame::Init(aContent, aParent, aPrevInFlow);
if (aPrevInFlow) {
// Make sure we copy bits from our prev-in-flow that will affect
// us. A continuation for a container frame needs to know if it
// has a child with a view so that we'll properly reposition it.
if (aPrevInFlow->GetStateBits() & NS_FRAME_HAS_CHILD_WITH_VIEW)
AddStateBits(NS_FRAME_HAS_CHILD_WITH_VIEW);
}
return rv;
}
NS_IMETHODIMP
nsContainerFrame::SetInitialChildList(nsIAtom* aListName,
nsIFrame* aChildList)
{
nsresult result;
if (!mFrames.IsEmpty()) {
// We already have child frames which means we've already been
// initialized
NS_NOTREACHED("unexpected second call to SetInitialChildList");
result = NS_ERROR_UNEXPECTED;
} else if (aListName) {
// All we know about is the unnamed principal child list
NS_NOTREACHED("unknown frame list");
result = NS_ERROR_INVALID_ARG;
} else {
#ifdef NS_DEBUG
nsFrame::VerifyDirtyBitSet(aChildList);
#endif
mFrames.SetFrames(aChildList);
result = NS_OK;
}
return result;
}
static void
CleanupGeneratedContentIn(nsIContent* aRealContent, nsIFrame* aRoot) {
nsIAtom* frameList = nsnull;
PRInt32 listIndex = 0;
do {
nsIFrame* child = aRoot->GetFirstChild(frameList);
while (child) {
nsIContent* content = child->GetContent();
if (content && content != aRealContent) {
content->UnbindFromTree();
}
::CleanupGeneratedContentIn(aRealContent, child);
child = child->GetNextSibling();
}
frameList = aRoot->GetAdditionalChildListName(listIndex++);
} while (frameList);
}
void
nsContainerFrame::Destroy()
{
// Prevent event dispatch during destruction
if (HasView()) {
GetView()->SetClientData(nsnull);
}
if (mState & NS_FRAME_GENERATED_CONTENT) {
// Make sure all the content nodes for the generated content inside
// this frame know it's going away.
// XXXbz would this be better done via a global structure in
// nsCSSFrameConstructor that could key off of
// GeneratedContentFrameRemoved or something? The problem is that
// our kids are gone by the time that's called.
::CleanupGeneratedContentIn(mContent, this);
}
// Delete the primary child list
mFrames.DestroyFrames();
// Destroy overflow frames now
nsFrameList overflowFrames(GetOverflowFrames(GetPresContext(), PR_TRUE));
overflowFrames.DestroyFrames();
// Destroy the frame and remove the flow pointers
nsSplittableFrame::Destroy();
}
/////////////////////////////////////////////////////////////////////////////
// Child frame enumeration
nsIFrame*
nsContainerFrame::GetFirstChild(nsIAtom* aListName) const
{
// We only know about the unnamed principal child list and the overflow
// list
if (nsnull == aListName) {
return mFrames.FirstChild();
} else if (nsLayoutAtoms::overflowList == aListName) {
return GetOverflowFrames(GetPresContext(), PR_FALSE);
} else {
return nsnull;
}
}
nsIAtom*
nsContainerFrame::GetAdditionalChildListName(PRInt32 aIndex) const
{
if (aIndex == 0) {
return nsLayoutAtoms::overflowList;
} else {
return nsnull;
}
}
/////////////////////////////////////////////////////////////////////////////
// Painting/Events
NS_IMETHODIMP
nsContainerFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
nsresult rv = DisplayBorderBackgroundOutline(aBuilder, aLists);
NS_ENSURE_SUCCESS(rv, rv);
return BuildDisplayListForNonBlockChildren(aBuilder, aDirtyRect, aLists);
}
nsresult
nsContainerFrame::BuildDisplayListForNonBlockChildren(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists,
PRUint32 aFlags)
{
nsIFrame* kid = mFrames.FirstChild();
// Put each child's background directly onto the content list
nsDisplayListSet set(aLists, aLists.Content());
// The children should be in content order
while (kid) {
nsresult rv = BuildDisplayListForChild(aBuilder, kid, aDirtyRect, set, aFlags);
NS_ENSURE_SUCCESS(rv, rv);
kid = kid->GetNextSibling();
}
return NS_OK;
}
NS_IMETHODIMP
nsContainerFrame::ReflowDirtyChild(nsIPresShell* aPresShell, nsIFrame* aChild)
{
// The container frame always generates a reflow command
// targeted at its child
// Note that even if this flag is already set, we still need to reflow the
// child because the frame may have more than one child
mState |= NS_FRAME_HAS_DIRTY_CHILDREN;
aPresShell->AppendReflowCommand(aChild, eReflowType_ReflowDirty, nsnull);
return NS_OK;
}
PRBool
nsContainerFrame::IsLeaf() const
{
return PR_FALSE;
}
/////////////////////////////////////////////////////////////////////////////
// Helper member functions
/**
* Position the view associated with |aKidFrame|, if there is one. A
* container frame should call this method after positioning a frame,
* but before |Reflow|.
*/
void
nsContainerFrame::PositionFrameView(nsIFrame* aKidFrame)
{
nsIFrame* parentFrame = aKidFrame->GetParent();
if (!aKidFrame->HasView() || !parentFrame)
return;
nsIView* view = aKidFrame->GetView();
nsIViewManager* vm = view->GetViewManager();
nsPoint pt;
nsIView* ancestorView = parentFrame->GetClosestView(&pt);
if (ancestorView != view->GetParent()) {
NS_ASSERTION(ancestorView == view->GetParent()->GetParent(),
"Allowed only one anonymous view between frames");
// parentFrame is responsible for positioning aKidFrame's view
// explicitly
return;
}
pt += aKidFrame->GetPosition();
vm->MoveViewTo(view, pt.x, pt.y);
}
// This code is duplicated in nsDisplayList.cpp. We'll remove the duplication
// when we remove all this view sync code.
static PRBool
NonZeroStyleCoord(const nsStyleCoord& aCoord) {
switch (aCoord.GetUnit()) {
case eStyleUnit_Percent:
return aCoord.GetPercentValue() > 0;
case eStyleUnit_Coord:
return aCoord.GetCoordValue() > 0;
case eStyleUnit_Null:
return PR_FALSE;
default:
return PR_TRUE;
}
}
static PRBool
HasNonZeroBorderRadius(nsStyleContext* aStyleContext) {
const nsStyleBorder* border = aStyleContext->GetStyleBorder();
nsStyleCoord coord;
border->mBorderRadius.GetTop(coord);
if (NonZeroStyleCoord(coord)) return PR_TRUE;
border->mBorderRadius.GetRight(coord);
if (NonZeroStyleCoord(coord)) return PR_TRUE;
border->mBorderRadius.GetBottom(coord);
if (NonZeroStyleCoord(coord)) return PR_TRUE;
border->mBorderRadius.GetLeft(coord);
if (NonZeroStyleCoord(coord)) return PR_TRUE;
return PR_FALSE;
}
static void
SyncFrameViewGeometryDependentProperties(nsPresContext* aPresContext,
nsIFrame* aFrame,
nsStyleContext* aStyleContext,
nsIView* aView,
PRUint32 aFlags)
{
nsIViewManager* vm = aView->GetViewManager();
PRBool isCanvas;
const nsStyleBackground* bg;
PRBool hasBG =
nsCSSRendering::FindBackground(aPresContext, aFrame, &bg, &isCanvas);
const nsStyleDisplay* display = aStyleContext->GetStyleDisplay();
// If the frame has a solid background color, 'background-clip:border',
// and it's a kind of frame that paints its background, and rounded borders aren't
// clipping the background, then it's opaque.
// If the frame has a native theme appearance then its background
// color is actually not relevant.
PRBool viewHasTransparentContent =
!(hasBG && !(bg->mBackgroundFlags & NS_STYLE_BG_COLOR_TRANSPARENT) &&
!display->mAppearance && bg->mBackgroundClip == NS_STYLE_BG_CLIP_BORDER &&
!HasNonZeroBorderRadius(aStyleContext));
PRBool drawnOnUniformField = PR_FALSE;
if (aStyleContext->GetPseudoType() == nsCSSAnonBoxes::scrolledContent) {
// If the nsGfxScrollFrame draws a solid unclipped background
// color, and nothing else, then tell the view system that we're
// drawn on a uniform field. Note that it's OK if the background
// is clipped to the padding area, since the scrollport is within
// the borders.
nsIFrame* scrollFrame = aFrame->GetParent();
while (scrollFrame->GetStyleContext()->GetPseudoType()
== nsCSSAnonBoxes::scrolledContent) {
scrollFrame = scrollFrame->GetParent();
}
PRBool scrollFrameIsCanvas;
const nsStyleBackground* scrollFrameBG;
PRBool scrollFrameHasBG =
nsCSSRendering::FindBackground(aPresContext, scrollFrame, &scrollFrameBG,
&scrollFrameIsCanvas);
const nsStyleDisplay* bgDisplay = scrollFrame->GetStyleDisplay();
drawnOnUniformField = scrollFrameHasBG &&
!(scrollFrameBG->mBackgroundFlags & NS_STYLE_BG_COLOR_TRANSPARENT) &&
(scrollFrameBG->mBackgroundFlags & NS_STYLE_BG_IMAGE_NONE) &&
!HasNonZeroBorderRadius(scrollFrame->GetStyleContext()) &&
!(bgDisplay->IsAbsolutelyPositioned()
&& (bgDisplay->mClipFlags & NS_STYLE_CLIP_RECT));
}
aView->SetHasUniformBackground(drawnOnUniformField);
if (isCanvas) {
nsIView* rootView;
vm->GetRootView(rootView);
nsIView* rootParent = rootView->GetParent();
if (!rootParent) {
// We're the root of a view manager hierarchy. We will have to
// paint something. NOTE: this can be overridden below.
viewHasTransparentContent = PR_FALSE;
}
nsIDocument *doc = aPresContext->PresShell()->GetDocument();
if (doc) {
nsIContent *rootElem = doc->GetRootContent();
if (!doc->GetParentDocument() &&
(nsCOMPtr<nsISupports>(doc->GetContainer())) &&
rootElem && rootElem->IsNodeOfType(nsINode::eXUL)) {
// we're XUL at the root of the document hierarchy. Try to make our
// window translucent.
// don't proceed unless this is the root view
// (sometimes the non-root-view is a canvas)
if (aView->HasWidget() && aView == rootView) {
viewHasTransparentContent = hasBG && (bg->mBackgroundFlags & NS_STYLE_BG_COLOR_TRANSPARENT);
aView->GetWidget()->SetWindowTranslucency(viewHasTransparentContent);
}
}
}
}
// XXX we should also set widget transparency for XUL popups
nsFrameState kidState = aFrame->GetStateBits();
PRBool isBlockLevel =
display->IsBlockLevel() || (kidState & NS_FRAME_OUT_OF_FLOW);
if (!viewHasTransparentContent) {
const nsStyleVisibility* vis = aStyleContext->GetStyleVisibility();
if (// If we're showing the view but the frame is hidden, then the
// view is transparent
(nsViewVisibility_kShow == aView->GetVisibility() &&
NS_STYLE_VISIBILITY_HIDDEN == vis->mVisible)) {
viewHasTransparentContent = PR_TRUE;
} else {
PRBool isScrolledContent = aView->GetParent() &&
aView->GetParent()->ToScrollableView();
// If we have overflowing kids and we're not clipped by a parent
// scrolling view, then the view must be transparent.
if (!isScrolledContent && (kidState & NS_FRAME_OUTSIDE_CHILDREN)) {
viewHasTransparentContent = PR_TRUE;
}
}
}
// If the frame has visible content that overflows the content area, then we
// need the view marked as having transparent content
// There are two types of clipping:
// - 'clip' which only applies to absolutely positioned elements, and is
// relative to the element's border edge. 'clip' applies to the entire
// element
// - 'overflow:-moz-hidden-unscrollable' which only applies to
// block-level elements and replaced elements. Note
// that out-of-flow frames like floated or absolutely positioned
// frames are block-level, but we can't rely on the 'display' value
// being set correctly in the style context...
PRBool hasClip = display->IsAbsolutelyPositioned() && (display->mClipFlags & NS_STYLE_CLIP_RECT);
PRBool hasOverflowClip = isBlockLevel && (display->mOverflowX == NS_STYLE_OVERFLOW_CLIP);
if (hasClip || hasOverflowClip) {
nsSize frameSize = aFrame->GetSize();
nsRect clipRect;
if (hasClip) {
// Start with the 'auto' values and then factor in user specified values
clipRect.SetRect(0, 0, frameSize.width, frameSize.height);
if (display->mClipFlags & NS_STYLE_CLIP_RECT) {
if (0 == (NS_STYLE_CLIP_TOP_AUTO & display->mClipFlags)) {
clipRect.y = display->mClip.y;
}
if (0 == (NS_STYLE_CLIP_LEFT_AUTO & display->mClipFlags)) {
clipRect.x = display->mClip.x;
}
if (0 == (NS_STYLE_CLIP_RIGHT_AUTO & display->mClipFlags)) {
clipRect.width = display->mClip.width;
}
if (0 == (NS_STYLE_CLIP_BOTTOM_AUTO & display->mClipFlags)) {
clipRect.height = display->mClip.height;
}
}
}
if (hasOverflowClip) {
const nsStyleBorder* borderStyle = aStyleContext->GetStyleBorder();
const nsStylePadding* paddingStyle = aStyleContext->GetStylePadding();
nsMargin padding;
nsRect overflowClipRect(0, 0, frameSize.width, frameSize.height);
overflowClipRect.Deflate(borderStyle->GetBorder());
// XXX We need to handle percentage padding
if (paddingStyle->GetPadding(padding)) {
overflowClipRect.Deflate(padding);
}
#ifdef DEBUG
else {
NS_WARNING("Percentage padding and CLIP overflow don't mix");
}
#endif
if (hasClip) {
// If both 'clip' and 'overflow-clip' apply then use the intersection
// of the two
clipRect.IntersectRect(clipRect, overflowClipRect);
} else {
clipRect = overflowClipRect;
}
}
nsRect newSize = aView->GetBounds();
newSize -= aView->GetPosition();
// If part of the view is being clipped out, then mark it transparent
if (clipRect.y > newSize.y
|| clipRect.x > newSize.x
|| clipRect.XMost() < newSize.XMost()
|| clipRect.YMost() < newSize.YMost()) {
viewHasTransparentContent = PR_TRUE;
}
// Set clipping of child views.
nsRegion region(clipRect);
vm->SetViewChildClipRegion(aView, &region);
} else {
// Remove clipping of child views.
vm->SetViewChildClipRegion(aView, nsnull);
}
vm->SetViewContentTransparency(aView, viewHasTransparentContent);
}
void
nsContainerFrame::SyncFrameViewAfterReflow(nsPresContext* aPresContext,
nsIFrame* aFrame,
nsIView* aView,
const nsRect* aCombinedArea,
PRUint32 aFlags)
{
if (!aView) {
return;
}
// Make sure the view is sized and positioned correctly
if (0 == (aFlags & NS_FRAME_NO_MOVE_VIEW)) {
PositionFrameView(aFrame);
}
if (0 == (aFlags & NS_FRAME_NO_SIZE_VIEW)) {
nsIViewManager* vm = aView->GetViewManager();
// If the frame has child frames that stick outside the content
// area, then size the view large enough to include those child
// frames
NS_ASSERTION(!(aFrame->GetStateBits() & NS_FRAME_OUTSIDE_CHILDREN) ||
aCombinedArea,
"resizing view for frame with overflow to the wrong size");
if ((aFrame->GetStateBits() & NS_FRAME_OUTSIDE_CHILDREN) && aCombinedArea) {
vm->ResizeView(aView, *aCombinedArea, PR_TRUE);
} else {
nsSize frameSize = aFrame->GetSize();
nsRect newSize(0, 0, frameSize.width, frameSize.height);
vm->ResizeView(aView, newSize, PR_TRUE);
}
// Even if the size hasn't changed, we need to sync up the
// geometry dependent properties, because (kidState &
// NS_FRAME_OUTSIDE_CHILDREN) might have changed, and we can't
// detect whether it has or not. Likewise, whether the view size
// has changed or not, we may need to change the transparency
// state even if there is no clip.
nsStyleContext* savedStyleContext = aFrame->GetStyleContext();
SyncFrameViewGeometryDependentProperties(aPresContext, aFrame, savedStyleContext, aView, aFlags);
}
}
void
nsContainerFrame::SyncFrameViewAfterSizeChange(nsPresContext* aPresContext,
nsIFrame* aFrame,
nsStyleContext* aStyleContext,
nsIView* aView,
PRUint32 aFlags)
{
NS_ASSERTION(!aStyleContext || aFrame->GetStyleContext() == aStyleContext,
"Wrong style context for frame?");
if (!aView) {
return;
}
if (nsnull == aStyleContext) {
aStyleContext = aFrame->GetStyleContext();
}
SyncFrameViewGeometryDependentProperties(aPresContext, aFrame, aStyleContext, aView, aFlags);
}
void
nsContainerFrame::SyncFrameViewProperties(nsPresContext* aPresContext,
nsIFrame* aFrame,
nsStyleContext* aStyleContext,
nsIView* aView,
PRUint32 aFlags)
{
NS_ASSERTION(!aStyleContext || aFrame->GetStyleContext() == aStyleContext,
"Wrong style context for frame?");
if (!aView) {
return;
}
nsIViewManager* vm = aView->GetViewManager();
if (nsnull == aStyleContext) {
aStyleContext = aFrame->GetStyleContext();
}
const nsStyleDisplay* display = aStyleContext->GetStyleDisplay();
// Set the view's opacity
vm->SetViewOpacity(aView, display->mOpacity);
// Make sure visibility is correct
if (0 == (aFlags & NS_FRAME_NO_VISIBILITY)) {
// See if the view should be hidden or visible
PRBool viewIsVisible = PR_TRUE;
if (!aStyleContext->GetStyleVisibility()->IsVisible() &&
!aFrame->SupportsVisibilityHidden()) {
// If it's a scrollable frame that can't hide its scrollbars,
// hide the view. This means that child elements can't override
// their parent's visibility, but it's not practical to leave it
// visible in all cases because the scrollbars will be showing
// XXXldb Does the view system really enforce this correctly?
viewIsVisible = PR_FALSE;
} else {
// if the view is for a popup, don't show the view if the popup is closed
nsIWidget* widget = aView->GetWidget();
if (widget) {
nsWindowType windowType;
widget->GetWindowType(windowType);
if (windowType == eWindowType_popup) {
widget->IsVisible(viewIsVisible);
}
}
}
vm->SetViewVisibility(aView, viewIsVisible ? nsViewVisibility_kShow :
nsViewVisibility_kHide);
}
// See if the frame is being relatively positioned or absolutely
// positioned
PRBool isPositioned = display->IsPositioned();
PRInt32 zIndex = 0;
PRBool autoZIndex = PR_FALSE;
if (!isPositioned) {
autoZIndex = PR_TRUE;
} else {
// Make sure z-index is correct
const nsStylePosition* position = aStyleContext->GetStylePosition();
if (position->mZIndex.GetUnit() == eStyleUnit_Integer) {
zIndex = position->mZIndex.GetIntValue();
} else if (position->mZIndex.GetUnit() == eStyleUnit_Auto) {
autoZIndex = PR_TRUE;
}
}
vm->SetViewZIndex(aView, autoZIndex, zIndex, isPositioned);
SyncFrameViewGeometryDependentProperties(aPresContext, aFrame, aStyleContext, aView, aFlags);
}
PRBool
nsContainerFrame::FrameNeedsView(nsIFrame* aFrame)
{
if (aFrame->NeedsView()) {
return PR_TRUE;
}
nsStyleContext* sc = aFrame->GetStyleContext();
const nsStyleDisplay* display = sc->GetStyleDisplay();
if (display->mOpacity != 1.0f) {
return PR_TRUE;
}
// See if the frame has a fixed background attachment
const nsStyleBackground *color;
PRBool isCanvas;
PRBool hasBackground =
nsCSSRendering::FindBackground(aFrame->GetPresContext(),
aFrame, &color, &isCanvas);
if (hasBackground && color->HasFixedBackground()) {
return PR_TRUE;
}
if (NS_STYLE_POSITION_RELATIVE == display->mPosition) {
return PR_TRUE;
} else if (display->IsAbsolutelyPositioned()) {
return PR_TRUE;
}
if (sc->GetPseudoType() == nsCSSAnonBoxes::scrolledContent) {
return PR_TRUE;
}
// See if the frame is block-level and has 'overflow' set to
// '-moz-hidden-unscrollable'. If so, then we need to give it a view
// so clipping of any child views works correctly. Note that if it's
// floated it is also block-level, but we can't trust that the style
// context 'display' value is set correctly.
if ((display->IsBlockLevel() || display->IsFloating()) &&
(display->mOverflowX == NS_STYLE_OVERFLOW_CLIP)) {
// XXX Check for the frame being a block frame and only force a view
// in that case, because adding a view for box frames seems to cause
// problems for XUL...
nsIAtom* frameType = aFrame->GetType();
if ((frameType == nsLayoutAtoms::blockFrame) ||
(frameType == nsLayoutAtoms::areaFrame)) {
return PR_TRUE;
}
}
return PR_FALSE;
}
/**
* Invokes the WillReflow() function, positions the frame and its view (if
* requested), and then calls Reflow(). If the reflow succeeds and the child
* frame is complete, deletes any next-in-flows using DeleteNextInFlowChild()
*/
nsresult
nsContainerFrame::ReflowChild(nsIFrame* aKidFrame,
nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nscoord aX,
nscoord aY,
PRUint32 aFlags,
nsReflowStatus& aStatus)
{
NS_PRECONDITION(aReflowState.frame == aKidFrame, "bad reflow state");
nsresult result;
#ifdef DEBUG
#ifdef REALLY_NOISY_MAX_ELEMENT_SIZE
if (aDesiredSize.mComputeMEW) {
aDesiredSize.mMaxElementWidth = nscoord(0xdeadbeef);
}
#endif
#endif
// Send the WillReflow() notification, and position the child frame
// and its view if requested
aKidFrame->WillReflow(aPresContext);
if (0 == (aFlags & NS_FRAME_NO_MOVE_FRAME)) {
aKidFrame->SetPosition(nsPoint(aX, aY));
}
if (0 == (aFlags & NS_FRAME_NO_MOVE_VIEW)) {
PositionFrameView(aKidFrame);
}
// Reflow the child frame
result = aKidFrame->Reflow(aPresContext, aDesiredSize, aReflowState,
aStatus);
#ifdef DEBUG
#ifdef REALLY_NOISY_MAX_ELEMENT_SIZE
if (aDesiredSize.mComputeMEW &&
(nscoord(0xdeadbeef) == aDesiredSize.mMaxElementWidth)) {
printf("nsContainerFrame: ");
nsFrame::ListTag(stdout, aKidFrame);
printf(" didn't set max-element-width!\n");
}
#endif
#endif
// If the reflow was successful and the child frame is complete, delete any
// next-in-flows
if (NS_SUCCEEDED(result) && NS_FRAME_IS_COMPLETE(aStatus)) {
nsIFrame* kidNextInFlow = aKidFrame->GetNextInFlow();
if (nsnull != kidNextInFlow) {
// Remove all of the childs next-in-flows. Make sure that we ask
// the right parent to do the removal (it's possible that the
// parent is not this because we are executing pullup code)
NS_STATIC_CAST(nsContainerFrame*, kidNextInFlow->GetParent())
->DeleteNextInFlowChild(aPresContext, kidNextInFlow);
}
}
return result;
}
/**
* Position the views of |aFrame|'s descendants. A container frame
* should call this method if it moves a frame after |Reflow|.
*/
void
nsContainerFrame::PositionChildViews(nsIFrame* aFrame)
{
if (!(aFrame->GetStateBits() & NS_FRAME_HAS_CHILD_WITH_VIEW)) {
return;
}
nsIAtom* childListName = nsnull;
PRInt32 childListIndex = 0;
do {
// Recursively walk aFrame's child frames
nsIFrame* childFrame = aFrame->GetFirstChild(childListName);
while (childFrame) {
// Position the frame's view (if it has one) otherwise recursively
// process its children
if (childFrame->HasView()) {
PositionFrameView(childFrame);
} else {
PositionChildViews(childFrame);
}
// Get the next sibling child frame
childFrame = childFrame->GetNextSibling();
}
childListName = aFrame->GetAdditionalChildListName(childListIndex++);
} while (childListName);
}
/**
* The second half of frame reflow. Does the following:
* - sets the frame's bounds
* - sizes and positions (if requested) the frame's view. If the frame's final
* position differs from the current position and the frame itself does not
* have a view, then any child frames with views are positioned so they stay
* in sync
* - sets the view's visibility, opacity, content transparency, and clip
* - invoked the DidReflow() function
*
* Flags:
* NS_FRAME_NO_MOVE_FRAME - don't move the frame. aX and aY are ignored in this
* case. Also implies NS_FRAME_NO_MOVE_VIEW
* NS_FRAME_NO_MOVE_VIEW - don't position the frame's view. Set this if you
* don't want to automatically sync the frame and view
* NS_FRAME_NO_SIZE_VIEW - don't size the frame's view
*/
nsresult
nsContainerFrame::FinishReflowChild(nsIFrame* aKidFrame,
nsPresContext* aPresContext,
const nsHTMLReflowState* aReflowState,
nsHTMLReflowMetrics& aDesiredSize,
nscoord aX,
nscoord aY,
PRUint32 aFlags)
{
nsPoint curOrigin = aKidFrame->GetPosition();
nsRect bounds(aX, aY, aDesiredSize.width, aDesiredSize.height);
aKidFrame->SetRect(bounds);
if (aKidFrame->HasView()) {
nsIView* view = aKidFrame->GetView();
// Make sure the frame's view is properly sized and positioned and has
// things like opacity correct
SyncFrameViewAfterReflow(aPresContext, aKidFrame, view,
&aDesiredSize.mOverflowArea,
aFlags);
}
if (!(aFlags & NS_FRAME_NO_MOVE_VIEW) &&
(curOrigin.x != aX || curOrigin.y != aY)) {
if (!aKidFrame->HasView()) {
// If the frame has moved, then we need to make sure any child views are
// correctly positioned
PositionChildViews(aKidFrame);
}
// We also need to redraw everything associated with the frame
// because if the frame's Reflow issued any invalidates, then they
// will be at the wrong offset ... note that this includes
// invalidates issued against the frame's children, so we need to
// invalidate the overflow area too.
aKidFrame->Invalidate(aDesiredSize.mOverflowArea);
}
return aKidFrame->DidReflow(aPresContext, aReflowState, NS_FRAME_REFLOW_FINISHED);
}
/**
* Remove and delete aNextInFlow and its next-in-flows. Updates the sibling and flow
* pointers
*/
void
nsContainerFrame::DeleteNextInFlowChild(nsPresContext* aPresContext,
nsIFrame* aNextInFlow)
{
nsIFrame* prevInFlow = aNextInFlow->GetPrevInFlow();
NS_PRECONDITION(prevInFlow, "bad prev-in-flow");
// If the next-in-flow has a next-in-flow then delete it, too (and
// delete it first).
// Do this in a loop so we don't overflow the stack for frames
// with very many next-in-flows
nsIFrame* nextNextInFlow = aNextInFlow->GetNextInFlow();
if (nextNextInFlow) {
nsAutoVoidArray frames;
for (nsIFrame* f = nextNextInFlow; f; f = f->GetNextInFlow()) {
frames.AppendElement(f);
}
for (PRInt32 i = frames.Count() - 1; i >= 0; --i) {
nsIFrame* delFrame = NS_STATIC_CAST(nsIFrame*, frames.ElementAt(i));
NS_STATIC_CAST(nsContainerFrame*, delFrame->GetParent())
->DeleteNextInFlowChild(aPresContext, delFrame);
}
}
// Disconnect the next-in-flow from the flow list
nsSplittableFrame::BreakFromPrevFlow(aNextInFlow);
// Take the next-in-flow out of the parent's child list
PRBool result = mFrames.RemoveFrame(aNextInFlow);
if (!result) {
// We didn't find the child in the parent's principal child list.
// Maybe it's on the overflow list?
nsFrameList overflowFrames(GetOverflowFrames(aPresContext, PR_TRUE));
if (overflowFrames.IsEmpty() || !overflowFrames.RemoveFrame(aNextInFlow)) {
NS_ASSERTION(result, "failed to remove frame");
}
// Set the overflow property again
if (overflowFrames.NotEmpty()) {
SetOverflowFrames(aPresContext, overflowFrames.FirstChild());
}
}
// Delete the next-in-flow frame and its descendants.
aNextInFlow->Destroy();
NS_POSTCONDITION(!prevInFlow->GetNextInFlow(), "non null next-in-flow");
}
nsIFrame*
nsContainerFrame::GetOverflowFrames(nsPresContext* aPresContext,
PRBool aRemoveProperty) const
{
nsPropertyTable *propTable = aPresContext->PropertyTable();
if (aRemoveProperty) {
return (nsIFrame*) propTable->UnsetProperty(this,
nsLayoutAtoms::overflowProperty);
}
return (nsIFrame*) propTable->GetProperty(this,
nsLayoutAtoms::overflowProperty);
}
// Destructor function for the overflow frame property
static void
DestroyOverflowFrames(void* aFrame,
nsIAtom* aPropertyName,
void* aPropertyValue,
void* aDtorData)
{
if (aPropertyValue) {
nsFrameList frames((nsIFrame*)aPropertyValue);
frames.DestroyFrames();
}
}
nsresult
nsContainerFrame::SetOverflowFrames(nsPresContext* aPresContext,
nsIFrame* aOverflowFrames)
{
nsresult rv =
aPresContext->PropertyTable()->SetProperty(this,
nsLayoutAtoms::overflowProperty,
aOverflowFrames,
DestroyOverflowFrames,
nsnull);
// Verify that we didn't overwrite an existing overflow list
NS_ASSERTION(rv != NS_PROPTABLE_PROP_OVERWRITTEN, "existing overflow list");
return rv;
}
/**
* Push aFromChild and its next siblings to the next-in-flow. Change the
* geometric parent of each frame that's pushed. If there is no next-in-flow
* the frames are placed on the overflow list (and the geometric parent is
* left unchanged).
*
* Updates the next-in-flow's child count. Does <b>not</b> update the
* pusher's child count.
*
* @param aFromChild the first child frame to push. It is disconnected from
* aPrevSibling
* @param aPrevSibling aFromChild's previous sibling. Must not be null. It's
* an error to push a parent's first child frame
*/
void
nsContainerFrame::PushChildren(nsPresContext* aPresContext,
nsIFrame* aFromChild,
nsIFrame* aPrevSibling)
{
NS_PRECONDITION(nsnull != aFromChild, "null pointer");
NS_PRECONDITION(nsnull != aPrevSibling, "pushing first child");
NS_PRECONDITION(aPrevSibling->GetNextSibling() == aFromChild, "bad prev sibling");
// Disconnect aFromChild from its previous sibling
aPrevSibling->SetNextSibling(nsnull);
if (nsnull != GetNextInFlow()) {
// XXX This is not a very good thing to do. If it gets removed
// then remove the copy of this routine that doesn't do this from
// nsInlineFrame.
nsContainerFrame* nextInFlow = (nsContainerFrame*)GetNextInFlow();
// When pushing and pulling frames we need to check for whether any
// views need to be reparented.
for (nsIFrame* f = aFromChild; f; f = f->GetNextSibling()) {
nsHTMLContainerFrame::ReparentFrameView(aPresContext, f, this, nextInFlow);
}
nextInFlow->mFrames.InsertFrames(nextInFlow, nsnull, aFromChild);
}
else {
// Add the frames to our overflow list
SetOverflowFrames(aPresContext, aFromChild);
}
}
/**
* Moves any frames on the overflow lists (the prev-in-flow's overflow list and
* the receiver's overflow list) to the child list.
*
* Updates this frame's child count and content mapping.
*
* @return PR_TRUE if any frames were moved and PR_FALSE otherwise
*/
PRBool
nsContainerFrame::MoveOverflowToChildList(nsPresContext* aPresContext)
{
PRBool result = PR_FALSE;
// Check for an overflow list with our prev-in-flow
nsContainerFrame* prevInFlow = (nsContainerFrame*)GetPrevInFlow();
if (nsnull != prevInFlow) {
nsIFrame* prevOverflowFrames = prevInFlow->GetOverflowFrames(aPresContext,
PR_TRUE);
if (prevOverflowFrames) {
NS_ASSERTION(mFrames.IsEmpty(), "bad overflow list");
// When pushing and pulling frames we need to check for whether any
// views need to be reparented.
for (nsIFrame* f = prevOverflowFrames; f; f = f->GetNextSibling()) {
nsHTMLContainerFrame::ReparentFrameView(aPresContext, f, prevInFlow, this);
}
mFrames.InsertFrames(this, nsnull, prevOverflowFrames);
result = PR_TRUE;
}
}
// It's also possible that we have an overflow list for ourselves
nsIFrame* overflowFrames = GetOverflowFrames(aPresContext, PR_TRUE);
if (overflowFrames) {
NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames");
mFrames.AppendFrames(nsnull, overflowFrames);
result = PR_TRUE;
}
return result;
}
/////////////////////////////////////////////////////////////////////////////
// Debugging
#ifdef NS_DEBUG
NS_IMETHODIMP
nsContainerFrame::List(FILE* out, PRInt32 aIndent) const
{
IndentBy(out, aIndent);
ListTag(out);
#ifdef DEBUG_waterson
fprintf(out, " [parent=%p]", NS_STATIC_CAST(void*, mParent));
#endif
if (HasView()) {
fprintf(out, " [view=%p]", NS_STATIC_CAST(void*, GetView()));
}
if (nsnull != mNextSibling) {
fprintf(out, " next=%p", NS_STATIC_CAST(void*, mNextSibling));
}
if (nsnull != GetPrevContinuation()) {
fprintf(out, " prev-continuation=%p", NS_STATIC_CAST(void*, GetPrevContinuation()));
}
if (nsnull != GetNextContinuation()) {
fprintf(out, " next-continuation=%p", NS_STATIC_CAST(void*, GetNextContinuation()));
}
fprintf(out, " {%d,%d,%d,%d}", mRect.x, mRect.y, mRect.width, mRect.height);
if (0 != mState) {
fprintf(out, " [state=%08x]", mState);
}
fprintf(out, " [content=%p]", NS_STATIC_CAST(void*, mContent));
nsContainerFrame* f = NS_CONST_CAST(nsContainerFrame*, this);
nsRect* overflowArea = f->GetOverflowAreaProperty(PR_FALSE);
if (overflowArea) {
fprintf(out, " [overflow=%d,%d,%d,%d]", overflowArea->x, overflowArea->y,
overflowArea->width, overflowArea->height);
}
fprintf(out, " [sc=%p]", NS_STATIC_CAST(void*, mStyleContext));
nsIAtom* pseudoTag = mStyleContext->GetPseudoType();
if (pseudoTag) {
nsAutoString atomString;
pseudoTag->ToString(atomString);
fprintf(out, " pst=%s",
NS_LossyConvertUTF16toASCII(atomString).get());
}
// Output the children
nsIAtom* listName = nsnull;
PRInt32 listIndex = 0;
PRBool outputOneList = PR_FALSE;
do {
nsIFrame* kid = GetFirstChild(listName);
if (nsnull != kid) {
if (outputOneList) {
IndentBy(out, aIndent);
}
outputOneList = PR_TRUE;
nsAutoString tmp;
if (nsnull != listName) {
listName->ToString(tmp);
fputs(NS_LossyConvertUTF16toASCII(tmp).get(), out);
}
fputs("<\n", out);
while (nsnull != kid) {
// Verify the child frame's parent frame pointer is correct
NS_ASSERTION(kid->GetParent() == (nsIFrame*)this, "bad parent frame pointer");
// Have the child frame list
nsIFrameDebug* frameDebug;
if (NS_SUCCEEDED(kid->QueryInterface(NS_GET_IID(nsIFrameDebug), (void**)&frameDebug))) {
frameDebug->List(out, aIndent + 1);
}
kid = kid->GetNextSibling();
}
IndentBy(out, aIndent);
fputs(">\n", out);
}
listName = GetAdditionalChildListName(listIndex++);
} while(nsnull != listName);
if (!outputOneList) {
fputs("<>\n", out);
}
return NS_OK;
}
#endif
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