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Mozilla/mozilla/layout/generic/nsContainerFrame.cpp
bzbarsky%mit.edu f53f98f7f3 Create an api for easily converting between the coordinate systems of two 
frames or two views.  Use this to fix the auto-positioning of abs pos boxes to
work no matter how their containing block and the block their placeholder lives
in are related, and convert various other callers to the new API.  Bug 266968,
r+sr=roc


git-svn-id: svn://10.0.0.236/trunk@164857 18797224-902f-48f8-a5cc-f745e15eee43
2004-11-03 16:16:57 +00:00

1343 lines
47 KiB
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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 ***** */
#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 "nsVoidArray.h"
#include "nsHTMLReflowCommand.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"
#ifdef NS_DEBUG
#undef NOISY
#else
#undef NOISY
#endif
nsContainerFrame::nsContainerFrame()
{
}
nsContainerFrame::~nsContainerFrame()
{
}
NS_IMETHODIMP
nsContainerFrame::Init(nsPresContext* aPresContext,
nsIContent* aContent,
nsIFrame* aParent,
nsStyleContext* aContext,
nsIFrame* aPrevInFlow)
{
nsresult rv;
rv = nsSplittableFrame::Init(aPresContext, aContent, aParent, aContext, 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(nsPresContext* aPresContext,
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->SetParent(nsnull);
content->SetDocument(nsnull, PR_TRUE, PR_TRUE);
}
::CleanupGeneratedContentIn(aRealContent, child);
child = child->GetNextSibling();
}
frameList = aRoot->GetAdditionalChildListName(listIndex++);
} while (frameList);
}
NS_IMETHODIMP
nsContainerFrame::Destroy(nsPresContext* aPresContext)
{
// 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(aPresContext);
// Destroy overflow frames now
nsFrameList overflowFrames(GetOverflowFrames(aPresContext, PR_TRUE));
overflowFrames.DestroyFrames(aPresContext);
// Destroy the frame and remove the flow pointers
return nsSplittableFrame::Destroy(aPresContext);
}
/////////////////////////////////////////////////////////////////////////////
// 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::Paint(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsFramePaintLayer aWhichLayer,
PRUint32 aFlags)
{
PaintChildren(aPresContext, aRenderingContext, aDirtyRect, aWhichLayer, aFlags);
return NS_OK;
}
// Paint the children of a container, assuming nothing about the
// childrens spatial arrangement. Given relative positioning, negative
// margins, etc, that's probably a good thing.
//
// Note: aDirtyRect is in our coordinate system (and of course, child
// rect's are also in our coordinate system)
void
nsContainerFrame::PaintChildren(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsFramePaintLayer aWhichLayer,
PRUint32 aFlags)
{
nsIFrame* kid = mFrames.FirstChild();
while (kid) {
PaintChild(aPresContext, aRenderingContext, aDirtyRect, kid, aWhichLayer, aFlags);
kid = kid->GetNextSibling();
}
}
// Paint one child frame
void
nsContainerFrame::PaintChild(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsIFrame* aFrame,
nsFramePaintLayer aWhichLayer,
PRUint32 aFlags)
{
NS_ASSERTION(aFrame, "no frame to paint!");
if (!aFrame->HasView()) {
nsRect kidRect = aFrame->GetRect();
// Compute the constrained damage area; set the overlap flag to
// PR_TRUE if any portion of the child frame intersects the
// dirty rect.
nsRect damageArea;
PRBool overlap;
if (NS_FRAME_OUTSIDE_CHILDREN & aFrame->GetStateBits()) {
// If the child frame has children that leak out of our box
// then we don't constrain the damageArea to just the childs
// bounding rect.
damageArea = aDirtyRect;
overlap = PR_TRUE;
}
else {
// Compute the intersection of the dirty rect and the childs
// rect (both are in our coordinate space). This limits the
// damageArea to just the portion that intersects the childs
// rect.
overlap = damageArea.IntersectRect(aDirtyRect, kidRect);
#ifdef NS_DEBUG
if (!overlap && (0 == kidRect.width) && (0 == kidRect.height)) {
overlap = PR_TRUE;
}
#endif
}
if (overlap) {
// Translate damage area into the kids coordinate
// system. Translate rendering context into the kids
// coordinate system.
damageArea.x -= kidRect.x;
damageArea.y -= kidRect.y;
// The transform components are saved and restored instead
// of using PushState and PopState because they are too slow
// because they also save and restore the clip state.
// Note: Setting a negative translation to restore the
// state does not work because the floating point errors can accumulate
// causing the display of some frames to be off by one pixel.
// This happens frequently when running in 120DPI mode where frames are
// often positioned at 1/2 pixel locations and small floating point errors
// will cause the frames to vary their pixel x location during scrolling
// operations causes a single scan line of pixels to be shifted left relative
// to the other scan lines for the same text.
// Save the transformation matrix's translation components.
float xMatrix;
float yMatrix;
nsTransform2D *theTransform;
aRenderingContext.GetCurrentTransform(theTransform);
NS_ASSERTION(theTransform != nsnull, "The rendering context transform is null");
theTransform->GetTranslation(&xMatrix, &yMatrix);
aRenderingContext.Translate(kidRect.x, kidRect.y);
// Paint the kid
aFrame->Paint(aPresContext, aRenderingContext, damageArea, aWhichLayer, aFlags);
// Restore the transformation matrix's translation components.
theTransform->SetTranslation(xMatrix, yMatrix);
#ifdef NS_DEBUG
// Draw a border around the child
if (nsIFrameDebug::GetShowFrameBorders() && !kidRect.IsEmpty()) {
aRenderingContext.SetColor(NS_RGB(255,0,0));
aRenderingContext.DrawRect(kidRect);
}
#endif
}
}
}
NS_IMETHODIMP
nsContainerFrame::GetFrameForPoint(nsPresContext* aPresContext,
const nsPoint& aPoint,
nsFramePaintLayer aWhichLayer,
nsIFrame** aFrame)
{
return GetFrameForPointUsing(aPresContext, aPoint, nsnull, aWhichLayer, (aWhichLayer == NS_FRAME_PAINT_LAYER_FOREGROUND), aFrame);
}
nsresult
nsContainerFrame::GetFrameForPointUsing(nsPresContext* aPresContext,
const nsPoint& aPoint,
nsIAtom* aList,
nsFramePaintLayer aWhichLayer,
PRBool aConsiderSelf,
nsIFrame** aFrame)
{
nsIFrame *hit;
nsPoint tmp;
PRBool inThisFrame = mRect.Contains(aPoint);
if (! ((mState & NS_FRAME_OUTSIDE_CHILDREN) || inThisFrame ) ) {
return NS_ERROR_FAILURE;
}
nsIFrame* kid = GetFirstChild(aList);
*aFrame = nsnull;
tmp.MoveTo(aPoint.x - mRect.x, aPoint.y - mRect.y);
nsPoint originOffset;
nsIView *view = nsnull;
nsresult rv = GetOriginToViewOffset(aPresContext, originOffset, &view);
if (NS_SUCCEEDED(rv) && view)
tmp += originOffset;
while (kid) {
if (aWhichLayer == NS_FRAME_PAINT_LAYER_ALL) {
// Check all layers on this kid before moving on to the next one
rv = kid->GetFrameForPoint(aPresContext, tmp,
NS_FRAME_PAINT_LAYER_FOREGROUND, &hit);
if (NS_FAILED(rv) || !hit) {
rv = kid->GetFrameForPoint(aPresContext, tmp,
NS_FRAME_PAINT_LAYER_FLOATS, &hit);
if (NS_FAILED(rv) || !hit) {
rv = kid->GetFrameForPoint(aPresContext, tmp,
NS_FRAME_PAINT_LAYER_BACKGROUND, &hit);
}
}
} else {
rv = kid->GetFrameForPoint(aPresContext, tmp, aWhichLayer, &hit);
}
if (NS_SUCCEEDED(rv) && hit) {
*aFrame = hit;
}
kid = kid->GetNextSibling();
}
if (*aFrame) {
return NS_OK;
}
if ( inThisFrame && aConsiderSelf ) {
if (GetStyleVisibility()->IsVisible()) {
*aFrame = this;
return NS_OK;
}
}
return NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsContainerFrame::ReplaceFrame(nsPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aOldFrame,
nsIFrame* aNewFrame)
{
nsIFrame* prevFrame;
nsresult rv;
// Get the old frame's previous sibling frame
nsFrameList frames(GetFirstChild(aListName));
NS_ASSERTION(frames.ContainsFrame(aOldFrame), "frame is not a valid child frame");
prevFrame = frames.GetPrevSiblingFor(aOldFrame);
// Default implementation treats it like two separate operations
rv = RemoveFrame(aPresContext, aPresShell, aListName, aOldFrame);
if (NS_SUCCEEDED(rv)) {
rv = InsertFrames(aPresContext, aPresShell, aListName, prevFrame, aNewFrame);
}
return rv;
}
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;
nsFrame::CreateAndPostReflowCommand(aPresShell, aChild,
eReflowType_ReflowDirty, nsnull, nsnull, nsnull);
return NS_OK;
}
/////////////////////////////////////////////////////////////////////////////
// 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(nsPresContext* aPresContext,
nsIFrame* aKidFrame)
{
if (aKidFrame->HasView()) {
nsIView* view = aKidFrame->GetView();
// Position view relative to its parent, not relative to aKidFrame's
// frame which may not have a view
nsIView* parentView = view->GetParent();
nsIView* containingView;
nsPoint origin;
aKidFrame->GetOffsetFromView(aPresContext, origin, &containingView);
nsIViewManager* vm = view->GetViewManager();
// it's possible for the parentView to be nonnull but containingView to be
// null, when the parent view doesn't belong to this frame tree but to
// the frame tree of some enclosing document. We do nothing in that case,
// but we have to check that containingView is nonnull or we will crash.
if (nsnull != containingView && containingView != parentView) {
NS_ERROR("This hack should not be needed now!!! See bug 126263.");
// XXX roc this should be no longer needed, but it still is for printing/print preview
// it is possible for parent view not to have a frame attached to it
// kind of an anonymous view. This happens with native scrollbars and
// the clip view. To fix this we need to go up and parentView chain
// until we find a view with client data. This is total HACK to fix
// the HACK below. COMBO box code should NOT be in the container code!!!
// And the case it looks from does not just happen for combo boxes. Native
// scrollframes get in this situation too!!
while (parentView) {
void *data = parentView->GetClientData();
if (data)
break;
origin -= parentView->GetPosition();
parentView = parentView->GetParent();
}
if (containingView != parentView)
{
// Huh, the view's parent view isn't the same as the containing view.
// This happens for combo box drop-down frames.
//
// We have the origin in the coordinate space of the containing view,
// but we need it in the coordinate space of the parent view so do a
// view translation
origin += containingView->GetOffsetTo(parentView);
}
}
if (parentView) {
// If the parent view is scrollable, then adjust the origin by
// the parent's scroll position.
nsIScrollableView* scrollable = nsnull;
CallQueryInterface(parentView, &scrollable);
if (scrollable) {
nscoord scrollX = 0, scrollY = 0;
scrollable->GetScrollPosition(scrollX, scrollY);
origin.x -= scrollX;
origin.y -= scrollY;
}
}
vm->MoveViewTo(view, origin.x, origin.y);
}
}
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);
// background-attachment: fixed is not really geometry dependent, but
// we set it here because it's cheap to do so
PRBool fixedBackground = hasBG && bg->HasFixedBackground();
// If the frame has a fixed background attachment, then indicate that the
// view's contents should be repainted and not bitblt'd
vm->SetViewBitBltEnabled(aView, !fixedBackground);
// 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.
PRBool viewHasTransparentContent =
!(hasBG && !(bg->mBackgroundFlags & NS_STYLE_BG_COLOR_TRANSPARENT) &&
bg->mBackgroundClip == NS_STYLE_BG_CLIP_BORDER &&
aFrame->CanPaintBackground() &&
!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() &&
rootElem && rootElem->IsContentOfType(nsIContent::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
const nsStyleDisplay* display = aStyleContext->GetStyleDisplay();
nsFrameState kidState = aFrame->GetStateBits();
if (!viewHasTransparentContent) {
// If we're showing the view but the frame is hidden, then the view is transparent
const nsStyleVisibility* vis = aStyleContext->GetStyleVisibility();
if ((nsViewVisibility_kShow == aView->GetVisibility()
&& NS_STYLE_VISIBILITY_HIDDEN == vis->mVisible)
|| (NS_STYLE_OVERFLOW_VISIBLE == display->mOverflowX
&& (kidState & NS_FRAME_OUTSIDE_CHILDREN) != 0)) {
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-clip' which only applies to block-level elements and replaced
// elements that have 'overflow' set to 'hidden'. 'overflow-clip' is relative
// to the content area and applies to content only (not border or background).
// 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 isBlockLevel = display->IsBlockLevel() || (kidState & NS_FRAME_OUT_OF_FLOW);
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 border, padding;
// XXX We don't support the 'overflow-clip' property yet so just use the
// content area (which is the default value) as the clip shape
nsRect overflowClipRect(0, 0, frameSize.width, frameSize.height);
borderStyle->GetBorder(border);
overflowClipRect.Deflate(border);
// XXX We need to handle percentage padding
if (paddingStyle->GetPadding(padding)) {
overflowClipRect.Deflate(padding);
}
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(aPresContext, 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 isTopMostView = display->IsPositioned();
// Make sure z-index is correct
const nsStylePosition* position = aStyleContext->GetStylePosition();
PRInt32 zIndex = 0;
PRBool autoZIndex = PR_FALSE;
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, isTopMostView);
SyncFrameViewGeometryDependentProperties(aPresContext, aFrame, aStyleContext, aView, aFlags);
}
PRBool
nsContainerFrame::FrameNeedsView(nsIFrame* aFrame)
{
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 'hidden'. 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(aPresContext, 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(nsPresContext* aPresContext,
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(aPresContext, childFrame);
} else {
PositionChildViews(aPresContext, 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(aPresContext, 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");
NS_PRECONDITION(mFrames.ContainsFrame(aNextInFlow), "bad geometric parent");
// If the next-in-flow has a next-in-flow then delete it, too (and
// delete it first).
nsIFrame* nextNextInFlow = aNextInFlow->GetNextInFlow();
if (nextNextInFlow) {
NS_STATIC_CAST(nsContainerFrame*, nextNextInFlow->GetParent())
->DeleteNextInFlowChild(aPresContext, nextNextInFlow);
}
#ifdef IBMBIDI
if ((prevInFlow->GetStateBits() & NS_FRAME_IS_BIDI) &&
(NS_STATIC_CAST(nsIFrame*,
aPresContext->PropertyTable()->GetProperty(prevInFlow, nsLayoutAtoms::nextBidi)) ==
aNextInFlow)) {
return;
}
#endif // IBMBIDI
// 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(aPresContext);
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(NS_STATIC_CAST(nsPresContext*, aDtorData));
}
}
nsresult
nsContainerFrame::SetOverflowFrames(nsPresContext* aPresContext,
nsIFrame* aOverflowFrames)
{
nsresult rv =
aPresContext->PropertyTable()->SetProperty(this,
nsLayoutAtoms::overflowProperty,
aOverflowFrames,
DestroyOverflowFrames,
aPresContext);
// 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 != mNextInFlow) {
// 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*)mNextInFlow;
// 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, mNextInFlow);
}
nextInFlow->mFrames.InsertFrames(mNextInFlow, 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*)mPrevInFlow;
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(nsPresContext* aPresContext, 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 != mPrevInFlow) {
fprintf(out, " prev-in-flow=%p", NS_STATIC_CAST(void*, mPrevInFlow));
}
if (nsnull != mNextInFlow) {
fprintf(out, " next-in-flow=%p", NS_STATIC_CAST(void*, mNextInFlow));
}
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));
// 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_LossyConvertUCS2toASCII(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(aPresContext, 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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