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gecko-dev/layout/generic/nsContainerFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* 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 compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* 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 Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
* Pierre Phaneuf <pp@ludusdesign.com>
*/
#include "nsContainerFrame.h"
#include "nsIContent.h"
#include "nsIPresContext.h"
#include "nsIRenderingContext.h"
#include "nsISpaceManager.h"
#include "nsIStyleContext.h"
#include "nsRect.h"
#include "nsPoint.h"
#include "nsGUIEvent.h"
#include "nsStyleConsts.h"
#include "nsIView.h"
#include "nsVoidArray.h"
#include "nsISizeOfHandler.h"
#include "nsIReflowCommand.h"
#include "nsHTMLIIDs.h"
#include "nsHTMLContainerFrame.h"
#include "nsIFrameManager.h"
#include "nsIPresShell.h"
#include "nsCOMPtr.h"
#include "nsLayoutAtoms.h"
#include "nsIViewManager.h"
#ifdef NS_DEBUG
#undef NOISY
#else
#undef NOISY
#endif
nsContainerFrame::nsContainerFrame()
{
}
nsContainerFrame::~nsContainerFrame()
{
}
NS_IMETHODIMP
nsContainerFrame::SetInitialChildList(nsIPresContext* aPresContext,
nsIAtom* aListName,
nsIFrame* aChildList)
{
// NS_PRECONDITION(mFrames.IsEmpty(), "already initialized");
nsresult result;
if (!mFrames.IsEmpty()) {
// We already have child frames which means we've already been
// initialized
result = NS_ERROR_UNEXPECTED;
} else if (aListName) {
// All we know about is the unnamed principal child list
result = NS_ERROR_INVALID_ARG;
} else {
#ifdef NS_DEBUG
nsFrame::VerifyDirtyBitSet(aChildList);
#endif
mFrames.SetFrames(aChildList);
result = NS_OK;
}
return result;
}
NS_IMETHODIMP
nsContainerFrame::Destroy(nsIPresContext* aPresContext)
{
// Prevent event dispatch during destruction
nsIView* view;
GetView(aPresContext, &view);
if (nsnull != view) {
view->SetClientData(nsnull);
}
// Delete the primary child list
mFrames.DestroyFrames(aPresContext);
// Base class will destroy the frame
return nsFrame::Destroy(aPresContext);
}
/////////////////////////////////////////////////////////////////////////////
// Child frame enumeration
NS_IMETHODIMP
nsContainerFrame::FirstChild(nsIPresContext* aPresContext,
nsIAtom* aListName,
nsIFrame** aFirstChild) const
{
NS_PRECONDITION(nsnull != aFirstChild, "null OUT parameter pointer");
// We only know about the unnamed principal child list and the overflow
// list
if (nsnull == aListName) {
*aFirstChild = mFrames.FirstChild();
return NS_OK;
} else if (nsLayoutAtoms::overflowList == aListName) {
*aFirstChild = GetOverflowFrames(aPresContext, PR_FALSE);
return NS_OK;
} else {
*aFirstChild = nsnull;
return NS_ERROR_INVALID_ARG;
}
}
/////////////////////////////////////////////////////////////////////////////
// Painting/Events
NS_IMETHODIMP
nsContainerFrame::Paint(nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsFramePaintLayer aWhichLayer)
{
PaintChildren(aPresContext, aRenderingContext, aDirtyRect, aWhichLayer);
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(nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsFramePaintLayer aWhichLayer)
{
const nsStyleDisplay* disp = (const nsStyleDisplay*)
mStyleContext->GetStyleData(eStyleStruct_Display);
nsIFrame* kid = mFrames.FirstChild();
while (nsnull != kid) {
PaintChild(aPresContext, aRenderingContext, aDirtyRect, kid, aWhichLayer);
kid->GetNextSibling(&kid);
}
}
// Paint one child frame
void
nsContainerFrame::PaintChild(nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsIFrame* aFrame,
nsFramePaintLayer aWhichLayer)
{
nsIView *pView;
aFrame->GetView(aPresContext, &pView);
if (nsnull == pView) {
nsRect kidRect;
aFrame->GetRect(kidRect);
nsFrameState state;
aFrame->GetFrameState(&state);
// 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 & state) {
// 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;
aRenderingContext.Translate(kidRect.x, kidRect.y);
// Paint the kid
aFrame->Paint(aPresContext, aRenderingContext, damageArea, aWhichLayer);
// don't use PushState and PopState, because they're slow
aRenderingContext.Translate(-kidRect.x, -kidRect.y);
#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(nsIPresContext* aPresContext,
const nsPoint& aPoint,
nsFramePaintLayer aWhichLayer,
nsIFrame** aFrame)
{
return GetFrameForPointUsing(aPresContext, aPoint, nsnull, aWhichLayer, (aWhichLayer == NS_FRAME_PAINT_LAYER_FOREGROUND), aFrame);
}
nsresult
nsContainerFrame::GetFrameForPointUsing(nsIPresContext* aPresContext,
const nsPoint& aPoint,
nsIAtom* aList,
nsFramePaintLayer aWhichLayer,
PRBool aConsiderSelf,
nsIFrame** aFrame)
{
nsIFrame *kid, *hit;
nsPoint tmp;
PRBool inThisFrame = mRect.Contains(aPoint);
if (! ((mState & NS_FRAME_OUTSIDE_CHILDREN) || inThisFrame ) ) {
return NS_ERROR_FAILURE;
}
FirstChild(aPresContext, aList, &kid);
*aFrame = nsnull;
tmp.MoveTo(aPoint.x - mRect.x, aPoint.y - mRect.y);
while (nsnull != kid) {
nsresult rv = kid->GetFrameForPoint(aPresContext, tmp, aWhichLayer, &hit);
if (NS_SUCCEEDED(rv) && hit) {
*aFrame = hit;
}
kid->GetNextSibling(&kid);
}
if (*aFrame) {
return NS_OK;
}
if ( inThisFrame && aConsiderSelf ) {
const nsStyleDisplay* disp = (const nsStyleDisplay*)
mStyleContext->GetStyleData(eStyleStruct_Display);
if (disp->IsVisible()) {
*aFrame = this;
return NS_OK;
}
}
return NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsContainerFrame::ReplaceFrame(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aOldFrame,
nsIFrame* aNewFrame)
{
nsIFrame* prevFrame;
nsIFrame* firstChild;
nsresult rv;
// Get the old frame's previous sibling frame
FirstChild(aPresContext, aListName, &firstChild);
nsFrameList frames(firstChild);
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
if (!(mState & NS_FRAME_HAS_DIRTY_CHILDREN)) {
mState |= NS_FRAME_HAS_DIRTY_CHILDREN;
nsFrame::CreateAndPostReflowCommand(aPresShell, aChild,
nsIReflowCommand::ReflowDirty, nsnull, nsnull, nsnull);
}
return NS_OK;
}
/////////////////////////////////////////////////////////////////////////////
// Helper member functions
static PRBool
TranslatePointTo(nsPoint& aPoint, nsIView* aChildView, nsIView* aParentView)
{
do {
nsRect bounds;
aChildView->GetBounds(bounds);
aPoint.x += bounds.x;
aPoint.y += bounds.y;
aChildView->GetParent(aChildView);
} while (aChildView && (aChildView != aParentView));
return aChildView == aParentView;
}
void
nsContainerFrame::PositionFrameView(nsIPresContext* aPresContext,
nsIFrame* aKidFrame,
nsIView* aView)
{
if (aView) {
// Position view relative to its parent, not relative to aKidFrame's
// frame which may not have a view
nsIView* containingView;
nsPoint origin;
nsIView* parentView;
nsIViewManager *vm;
aView->GetParent(parentView);
aKidFrame->GetOffsetFromView(aPresContext, origin, &containingView);
aView->GetViewManager(vm);
if (containingView != parentView)
{
// 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 = 0;
parentView->GetClientData(data);
if (data)
break;
nsRect bounds;
parentView->GetBounds(bounds);
origin.x += bounds.x;
origin.y += bounds.y;
parentView->GetParent(parentView);
}
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
NS_VERIFY(TranslatePointTo(origin, containingView, parentView), "translation failed");
vm->MoveViewTo(aView, origin.x, origin.y);
}
}
vm->MoveViewTo(aView, origin.x, origin.y);
NS_RELEASE(vm);
}
}
void
nsContainerFrame::SyncFrameViewAfterReflow(nsIPresContext* aPresContext,
nsIFrame* aFrame,
nsIView* aView,
const nsRect* aCombinedArea,
PRUint32 aFlags)
{
if (aView) {
nsIViewManager *vm;
nsFrameState kidState;
nsSize frameSize;
aView->GetViewManager(vm);
aFrame->GetFrameState(&kidState);
aFrame->GetSize(frameSize);
// Make sure the view is sized and positioned correctly
if (0 == (aFlags & NS_FRAME_NO_MOVE_VIEW)) {
nsIView* containingView;
nsPoint origin;
nsIView* parentView;
aView->GetParent(parentView);
aFrame->GetOffsetFromView(aPresContext, origin, &containingView);
if (containingView != parentView)
{
// 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 = 0;
parentView->GetClientData(data);
if (data)
break;
nsRect bounds;
parentView->GetBounds(bounds);
origin.x += bounds.x;
origin.y += bounds.y;
parentView->GetParent(parentView);
}
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
NS_VERIFY(TranslatePointTo(origin, containingView, parentView), "translation failed");
vm->MoveViewTo(aView, origin.x, origin.y);
}
}
vm->MoveViewTo(aView, origin.x, origin.y);
}
if (0 == (aFlags & NS_FRAME_NO_SIZE_VIEW)) {
// If the frame has child frames that stick outside the content
// area, then size the view large enough to include those child
// frames
if ((kidState & NS_FRAME_OUTSIDE_CHILDREN) && aCombinedArea) {
vm->ResizeView(aView, aCombinedArea->XMost(), aCombinedArea->YMost());
} else {
vm->ResizeView(aView, frameSize.width, frameSize.height);
}
}
const nsStyleColor* color;
const nsStyleDisplay* display;
aFrame->GetStyleData(eStyleStruct_Color, (const nsStyleStruct*&)color);
aFrame->GetStyleData(eStyleStruct_Display, (const nsStyleStruct*&)display);
// Set the view's opacity
vm->SetViewOpacity(aView, color->mOpacity);
// See if the view should be hidden or visible
PRBool viewIsVisible = PR_TRUE;
PRBool viewHasTransparentContent = (color->mBackgroundFlags &
NS_STYLE_BG_COLOR_TRANSPARENT) == NS_STYLE_BG_COLOR_TRANSPARENT;
if (NS_STYLE_VISIBILITY_COLLAPSE == display->mVisible) {
viewIsVisible = PR_FALSE;
}
else if (NS_STYLE_VISIBILITY_HIDDEN == display->mVisible) {
// If it has a widget, hide the view because the widget can't deal with it
nsIWidget* widget = nsnull;
aView->GetWidget(widget);
if (widget) {
viewIsVisible = PR_FALSE;
NS_RELEASE(widget);
}
else {
// If it's a scroll frame, then 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
nsIAtom* frameType;
aFrame->GetFrameType(&frameType);
if (frameType == nsLayoutAtoms::scrollFrame) {
viewIsVisible = PR_FALSE;
} else {
// If we're a container element, then leave the view visible, but
// mark it as having transparent content. The reason we need to
// do this is that child elements can override their parent's
// hidden visibility and be visible anyway
nsIFrame* firstChild;
aFrame->FirstChild(aPresContext, nsnull, &firstChild);
if (firstChild) {
// Not a left frame, so the view needs to be visible, but marked
// as having transparent content
viewHasTransparentContent = PR_TRUE;
} else {
// Leaf frame so go ahead and hide the view
viewIsVisible = PR_FALSE;
}
}
NS_IF_RELEASE(frameType);
}
}
// If the frame has visible content that overflows the content area, then we
// need the view marked as having transparent content
if (NS_STYLE_OVERFLOW_VISIBLE == display->mOverflow) {
if (kidState & NS_FRAME_OUTSIDE_CHILDREN) {
viewHasTransparentContent = PR_TRUE;
}
}
// Make sure visibility is correct
if (0 == (aFlags & NS_FRAME_NO_VISIBILITY)) {
vm->SetViewVisibility(aView, viewIsVisible ? nsViewVisibility_kShow :
nsViewVisibility_kHide);
}
// Make sure content transparency is correct
if (viewIsVisible) {
vm->SetViewContentTransparency(aView, viewHasTransparentContent);
}
// Make sure z-index is correct
PRInt32 zIndex = 0;
PRBool autoZIndex = PR_FALSE;
const nsStylePosition* position;
aFrame->GetStyleData(eStyleStruct_Position, (const nsStyleStruct*&)position);
if (position->mZIndex.GetUnit() == eStyleUnit_Integer) {
zIndex = position->mZIndex.GetIntValue();
} else if (position->mZIndex.GetUnit() == eStyleUnit_Auto) {
autoZIndex = PR_TRUE;
}
vm->SetViewZIndex(aView, zIndex);
vm->SetViewAutoZIndex(aView, autoZIndex);
// 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 hasClip, hasOverflowClip;
PRBool isBlockLevel = display->IsBlockLevel() || (0 != (kidState & NS_FRAME_OUT_OF_FLOW));
hasClip = position->IsAbsolutelyPositioned() && (display->mClipFlags & NS_STYLE_CLIP_RECT);
hasOverflowClip = isBlockLevel && (display->mOverflow == NS_STYLE_OVERFLOW_HIDDEN);
if (hasClip || hasOverflowClip) {
nsRect clipRect, overflowClipRect;
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 nsStyleSpacing* spacing;
nsMargin border, padding;
aFrame->GetStyleData(eStyleStruct_Spacing, (const nsStyleStruct*&)spacing);
// 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
overflowClipRect.SetRect(0, 0, frameSize.width, frameSize.height);
spacing->GetBorder(border);
overflowClipRect.Deflate(border);
// XXX We need to handle percentage padding
if (spacing->GetPadding(padding)) {
overflowClipRect.Deflate(padding);
}
}
// If both 'clip' and 'overflow-clip' apply then use the intersection
// of the two
if (hasClip && hasOverflowClip) {
clipRect.IntersectRect(clipRect, overflowClipRect);
}
// Set clipping of child views.
if (hasClip) {
aView->SetChildClip(clipRect.x, clipRect.y, clipRect.XMost(), clipRect.YMost());
} else {
aView->SetChildClip(overflowClipRect.x, overflowClipRect.y,
overflowClipRect.XMost(), overflowClipRect.YMost());
}
PRUint32 vflags;
aView->GetViewFlags(&vflags);
aView->SetViewFlags(vflags | NS_VIEW_PUBLIC_FLAG_CLIPCHILDREN);
} else {
// Remove clipping of child views.
PRUint32 vflags;
aView->GetViewFlags(&vflags);
aView->SetViewFlags(vflags & ~NS_VIEW_PUBLIC_FLAG_CLIPCHILDREN);
}
NS_RELEASE(vm);
}
}
/**
* 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 DeleteChildsNextInFlow()
*/
nsresult
nsContainerFrame::ReflowChild(nsIFrame* aKidFrame,
nsIPresContext* 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
nsSize* saveMaxElementSize = aDesiredSize.maxElementSize;
#ifdef REALLY_NOISY_MAX_ELEMENT_SIZE
if (nsnull != aDesiredSize.maxElementSize) {
aDesiredSize.maxElementSize->width = nscoord(0xdeadbeef);
aDesiredSize.maxElementSize->height = 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->MoveTo(aPresContext, aX, aY);
}
if (0 == (aFlags & NS_FRAME_NO_MOVE_VIEW)) {
nsIView* view;
aKidFrame->GetView(aPresContext, &view);
if (view) {
PositionFrameView(aPresContext, aKidFrame, view);
}
}
// Reflow the child frame
result = aKidFrame->Reflow(aPresContext, aDesiredSize, aReflowState,
aStatus);
#ifdef DEBUG
if (saveMaxElementSize != aDesiredSize.maxElementSize) {
printf("nsContainerFrame: ");
nsFrame::ListTag(stdout, aKidFrame);
printf(" changed the maxElementSize *pointer* (baaaad boy!)\n");
}
#ifdef REALLY_NOISY_MAX_ELEMENT_SIZE
if ((nsnull != aDesiredSize.maxElementSize) &&
((nscoord(0xdeadbeef) == aDesiredSize.maxElementSize->width) ||
(nscoord(0xdeadbeef) == aDesiredSize.maxElementSize->height))) {
printf("nsContainerFrame: ");
nsFrame::ListTag(stdout, aKidFrame);
printf(" didn't set max-element-size!\n");
aDesiredSize.maxElementSize->width = 0;
aDesiredSize.maxElementSize->height = 0;
}
#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(&kidNextInFlow);
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)
nsIFrame* parent;
aKidFrame->GetParent(&parent);
((nsContainerFrame*)parent)->DeleteChildsNextInFlow(aPresContext,
aKidFrame);
}
}
return result;
}
void
nsContainerFrame::PositionChildViews(nsIPresContext* aPresContext,
nsIFrame* aFrame)
{
nsIAtom* childListName = nsnull;
PRInt32 childListIndex = 0;
do {
// Recursively walk aFrame's child frames
nsIFrame* childFrame;
aFrame->FirstChild(aPresContext, childListName, &childFrame);
while (childFrame) {
nsIView* view;
// See if the child frame has a view
childFrame->GetView(aPresContext, &view);
if (view) {
// Position the view. Because any child views are relative to their
// parent, there's no need to recurse
PositionFrameView(aPresContext, childFrame, view);
} else {
// Recursively examine its child frames
PositionChildViews(aPresContext, childFrame);
}
// Get the next sibling child frame
childFrame->GetNextSibling(&childFrame);
}
NS_IF_RELEASE(childListName);
aFrame->GetAdditionalChildListName(childListIndex++, &childListName);
} 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
* NS_FRAME_NO_MOVE_CHILD_VIEWS - don't move child views. This is for the case
* where the frame's new position differs from its current position and the
* frame itself doesn't have a view, so moving the frame would cause any child
* views to be out of sync
*/
nsresult
nsContainerFrame::FinishReflowChild(nsIFrame* aKidFrame,
nsIPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
nscoord aX,
nscoord aY,
PRUint32 aFlags)
{
nsPoint curOrigin;
nsRect bounds(aX, aY, aDesiredSize.width, aDesiredSize.height);
aKidFrame->GetOrigin(curOrigin);
aKidFrame->SetRect(aPresContext, bounds);
nsIView* view;
aKidFrame->GetView(aPresContext, &view);
if (view) {
// Make sure the frame's view is properly sized and positioned and has
// things like opacity correct
SyncFrameViewAfterReflow(aPresContext, aKidFrame, view,
&aDesiredSize.mOverflowArea,
aFlags);
} else if (0 == (aFlags & NS_FRAME_NO_MOVE_CHILD_VIEWS)) {
// If the frame has moved, then we need to make sure any child views are
// correctly positioned
if ((curOrigin.x != aX) || (curOrigin.y != aY)) {
PositionChildViews(aPresContext, aKidFrame);
}
}
return aKidFrame->DidReflow(aPresContext, NS_FRAME_REFLOW_FINISHED);
}
/**
* Remove and delete aChild's next-in-flow(s). Updates the sibling and flow
* pointers
*
* @param aChild child this child's next-in-flow
* @return PR_TRUE if successful and PR_FALSE otherwise
*/
void
nsContainerFrame::DeleteChildsNextInFlow(nsIPresContext* aPresContext,
nsIFrame* aChild)
{
NS_PRECONDITION(mFrames.ContainsFrame(aChild), "bad geometric parent");
nsIFrame* nextInFlow;
nsContainerFrame* parent;
aChild->GetNextInFlow(&nextInFlow);
NS_PRECONDITION(nsnull != nextInFlow, "null next-in-flow");
nextInFlow->GetParent((nsIFrame**)&parent);
// If the next-in-flow has a next-in-flow then delete it, too (and
// delete it first).
nsIFrame* nextNextInFlow;
nextInFlow->GetNextInFlow(&nextNextInFlow);
if (nsnull != nextNextInFlow) {
parent->DeleteChildsNextInFlow(aPresContext, nextInFlow);
}
// Disconnect the next-in-flow from the flow list
nsSplittableFrame::BreakFromPrevFlow(nextInFlow);
// Take the next-in-flow out of the parent's child list
PRBool result = parent->mFrames.RemoveFrame(nextInFlow);
if (!result) {
// We didn't find the child in the parent's principal child list.
// Maybe it's on the overflow list?
nsFrameList overflowFrames(parent->GetOverflowFrames(aPresContext, PR_TRUE));
if (overflowFrames.IsEmpty() || !overflowFrames.RemoveFrame(nextInFlow)) {
NS_ASSERTION(result, "failed to remove frame");
}
// Set the overflow property again
if (overflowFrames.NotEmpty()) {
parent->SetOverflowFrames(aPresContext, overflowFrames.FirstChild());
}
}
// Delete the next-in-flow frame
nextInFlow->Destroy(aPresContext);
#ifdef NS_DEBUG
aChild->GetNextInFlow(&nextInFlow);
NS_POSTCONDITION(nsnull == nextInFlow, "non null next-in-flow");
#endif
}
nsIFrame*
nsContainerFrame::GetOverflowFrames(nsIPresContext* aPresContext,
PRBool aRemoveProperty) const
{
nsCOMPtr<nsIPresShell> presShell;
aPresContext->GetShell(getter_AddRefs(presShell));
if (presShell) {
nsCOMPtr<nsIFrameManager> frameManager;
presShell->GetFrameManager(getter_AddRefs(frameManager));
if (frameManager) {
PRUint32 options = 0;
void* value;
if (aRemoveProperty) {
options |= NS_IFRAME_MGR_REMOVE_PROP;
}
frameManager->GetFrameProperty((nsIFrame*)this, nsLayoutAtoms::overflowProperty,
options, &value);
return (nsIFrame*)value;
}
}
return nsnull;
}
// Destructor function for the overflow frame property
static void
DestroyOverflowFrames(nsIPresContext* aPresContext,
nsIFrame* aFrame,
nsIAtom* aPropertyName,
void* aPropertyValue)
{
if (aPropertyValue) {
nsFrameList frames((nsIFrame*)aPropertyValue);
frames.DestroyFrames(aPresContext);
}
}
nsresult
nsContainerFrame::SetOverflowFrames(nsIPresContext* aPresContext,
nsIFrame* aOverflowFrames)
{
nsCOMPtr<nsIPresShell> presShell;
nsresult rv = NS_ERROR_FAILURE;
aPresContext->GetShell(getter_AddRefs(presShell));
if (presShell) {
nsCOMPtr<nsIFrameManager> frameManager;
presShell->GetFrameManager(getter_AddRefs(frameManager));
if (frameManager) {
rv = frameManager->SetFrameProperty(this, nsLayoutAtoms::overflowProperty,
aOverflowFrames, DestroyOverflowFrames);
// Verify that we didn't overwrite an existing overflow list
NS_ASSERTION(rv != NS_IFRAME_MGR_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(nsIPresContext* aPresContext,
nsIFrame* aFromChild,
nsIFrame* aPrevSibling)
{
NS_PRECONDITION(nsnull != aFromChild, "null pointer");
NS_PRECONDITION(nsnull != aPrevSibling, "pushing first child");
#ifdef NS_DEBUG
nsIFrame* prevNextSibling;
aPrevSibling->GetNextSibling(&prevNextSibling);
NS_PRECONDITION(prevNextSibling == aFromChild, "bad prev sibling");
#endif
// 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->GetNextSibling(&f)) {
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 overflwo 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(nsIPresContext* 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->GetNextSibling(&f)) {
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(nsIPresContext* aPresContext, FILE* out, PRInt32 aIndent) const
{
IndentBy(out, aIndent);
ListTag(out);
#ifdef DEBUG_waterson
fprintf(out, " [parent=%p]", mParent);
#endif
nsIView* view;
GetView(aPresContext, &view);
if (nsnull != view) {
fprintf(out, " [view=%p]", view);
}
if (nsnull != mNextSibling) {
fprintf(out, " next=%p", mNextSibling);
}
if (nsnull != mPrevInFlow) {
fprintf(out, " prev-in-flow=%p", mPrevInFlow);
}
if (nsnull != mNextInFlow) {
fprintf(out, " next-in-flow=%p", 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, " sc=%p", mStyleContext);
// Output the children
nsIAtom* listName = nsnull;
PRInt32 listIndex = 0;
PRBool outputOneList = PR_FALSE;
do {
nsIFrame* kid;
FirstChild(aPresContext, listName, &kid);
if (nsnull != kid) {
if (outputOneList) {
IndentBy(out, aIndent);
}
outputOneList = PR_TRUE;
nsAutoString tmp;
if (nsnull != listName) {
listName->ToString(tmp);
fputs(tmp, out);
}
fputs("<\n", out);
while (nsnull != kid) {
// Verify the child frame's parent frame pointer is correct
nsIFrame* parentFrame;
kid->GetParent(&parentFrame);
NS_ASSERTION(parentFrame == (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->GetNextSibling(&kid);
}
IndentBy(out, aIndent);
fputs(">\n", out);
}
NS_IF_RELEASE(listName);
GetAdditionalChildListName(listIndex++, &listName);
} while(nsnull != listName);
if (!outputOneList) {
fputs("<>\n", out);
}
return NS_OK;
}
NS_IMETHODIMP
nsContainerFrame::SizeOf(nsISizeOfHandler* aHandler, PRUint32* aResult) const
{
if (!aResult) {
return NS_ERROR_NULL_POINTER;
}
*aResult = sizeof(*this);
return NS_OK;
}
#endif
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