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pjs/layout/base/nsLayoutUtils.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et tw=78: */
/* ***** 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):
*
* 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 "nsLayoutUtils.h"
#include "nsIFrame.h"
#include "nsIFormControlFrame.h"
#include "nsPresContext.h"
#include "nsIContent.h"
#include "nsFrameList.h"
#include "nsLayoutAtoms.h"
#include "nsIAtom.h"
#include "nsCSSPseudoElements.h"
#include "nsIView.h"
#include "nsIScrollableView.h"
#include "nsPlaceholderFrame.h"
#include "nsIScrollableFrame.h"
#include "nsCSSFrameConstructor.h"
#include "nsIPrivateDOMEvent.h"
#include "nsIDOMEvent.h"
#include "nsGUIEvent.h"
#include "nsDisplayList.h"
#include "nsRegion.h"
#ifdef MOZ_SVG_FOREIGNOBJECT
#include "nsSVGForeignObjectFrame.h"
#include "nsSVGUtils.h"
#include "nsISVGOuterSVGFrame.h"
#endif
/**
* A namespace class for static layout utilities.
*/
/**
* GetFirstChildFrame returns the first "real" child frame of a
* given frame. It will descend down into pseudo-frames (unless the
* pseudo-frame is the :before generated frame).
* @param aFrame the frame
* @param aFrame the frame's content node
*/
static nsIFrame*
GetFirstChildFrame(nsIFrame* aFrame,
nsIContent* aContent)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
// Get the first child frame
nsIFrame* childFrame = aFrame->GetFirstChild(nsnull);
// If the child frame is a pseudo-frame, then return its first child.
// Note that the frame we create for the generated content is also a
// pseudo-frame and so don't drill down in that case
if (childFrame &&
childFrame->IsPseudoFrame(aContent) &&
!childFrame->IsGeneratedContentFrame()) {
return GetFirstChildFrame(childFrame, aContent);
}
return childFrame;
}
/**
* GetLastChildFrame returns the last "real" child frame of a
* given frame. It will descend down into pseudo-frames (unless the
* pseudo-frame is the :after generated frame).
* @param aFrame the frame
* @param aFrame the frame's content node
*/
static nsIFrame*
GetLastChildFrame(nsIFrame* aFrame,
nsIContent* aContent)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
// Get the last in flow frame
nsIFrame* lastInFlow = aFrame->GetLastInFlow();
// Get the last child frame
nsIFrame* firstChildFrame = lastInFlow->GetFirstChild(nsnull);
if (firstChildFrame) {
nsFrameList frameList(firstChildFrame);
nsIFrame* lastChildFrame = frameList.LastChild();
NS_ASSERTION(lastChildFrame, "unexpected error");
// Get the frame's first-in-flow. This matters in case the frame has
// been continuted across multiple lines
lastChildFrame = lastChildFrame->GetFirstInFlow();
// If the last child frame is a pseudo-frame, then return its last child.
// Note that the frame we create for the generated content is also a
// pseudo-frame and so don't drill down in that case
if (lastChildFrame &&
lastChildFrame->IsPseudoFrame(aContent) &&
!lastChildFrame->IsGeneratedContentFrame()) {
return GetLastChildFrame(lastChildFrame, aContent);
}
return lastChildFrame;
}
return nsnull;
}
// static
nsIFrame*
nsLayoutUtils::GetBeforeFrame(nsIFrame* aFrame)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
NS_ASSERTION(!aFrame->GetPrevInFlow(), "aFrame must be first-in-flow");
nsIFrame* firstFrame = GetFirstChildFrame(aFrame, aFrame->GetContent());
if (firstFrame && IsGeneratedContentFor(nsnull, firstFrame,
nsCSSPseudoElements::before)) {
return firstFrame;
}
return nsnull;
}
// static
nsIFrame*
nsLayoutUtils::GetAfterFrame(nsIFrame* aFrame)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
nsIFrame* lastFrame = GetLastChildFrame(aFrame, aFrame->GetContent());
if (lastFrame && IsGeneratedContentFor(nsnull, lastFrame,
nsCSSPseudoElements::after)) {
return lastFrame;
}
return nsnull;
}
// static
nsIFrame*
nsLayoutUtils::GetPageFrame(nsIFrame* aFrame)
{
for (nsIFrame* frame = aFrame; frame; frame = frame->GetParent()) {
if (frame->GetType() == nsLayoutAtoms::pageFrame) {
return frame;
}
}
return nsnull;
}
nsIFrame*
nsLayoutUtils::GetFloatFromPlaceholder(nsIFrame* aFrame) {
if (nsLayoutAtoms::placeholderFrame != aFrame->GetType()) {
return nsnull;
}
nsIFrame *outOfFlowFrame =
nsPlaceholderFrame::GetRealFrameForPlaceholder(aFrame);
if (outOfFlowFrame->GetStyleDisplay()->IsFloating()) {
return outOfFlowFrame;
}
return nsnull;
}
// static
PRBool
nsLayoutUtils::IsGeneratedContentFor(nsIContent* aContent,
nsIFrame* aFrame,
nsIAtom* aPseudoElement)
{
NS_PRECONDITION(aFrame, "Must have a frame");
NS_PRECONDITION(aPseudoElement, "Must have a pseudo name");
if (!aFrame->IsGeneratedContentFrame()) {
return PR_FALSE;
}
if (aContent && aFrame->GetContent() != aContent) {
return PR_FALSE;
}
return aFrame->GetStyleContext()->GetPseudoType() == aPseudoElement;
}
// static
nsIFrame*
nsLayoutUtils::GetCrossDocParentFrame(nsIFrame* aFrame)
{
nsIFrame* p = aFrame->GetParent();
if (p)
return p;
nsIView* v = aFrame->GetView();
if (!v)
return nsnull;
v = v->GetParent(); // anonymous inner view
if (!v)
return nsnull;
v = v->GetParent(); // subdocumentframe's view
if (!v)
return nsnull;
return NS_STATIC_CAST(nsIFrame*, v->GetClientData());
}
// static
PRBool
nsLayoutUtils::IsProperAncestorFrameCrossDoc(nsIFrame* aAncestorFrame, nsIFrame* aFrame,
nsIFrame* aCommonAncestor)
{
if (aFrame == aCommonAncestor)
return PR_FALSE;
nsIFrame* parentFrame = GetCrossDocParentFrame(aFrame);
while (parentFrame != aCommonAncestor) {
if (parentFrame == aAncestorFrame)
return PR_TRUE;
parentFrame = GetCrossDocParentFrame(parentFrame);
}
return PR_FALSE;
}
// static
PRBool
nsLayoutUtils::IsProperAncestorFrame(nsIFrame* aAncestorFrame, nsIFrame* aFrame,
nsIFrame* aCommonAncestor)
{
if (aFrame == aCommonAncestor) {
return PR_FALSE;
}
nsIFrame* parentFrame = aFrame->GetParent();
while (parentFrame != aCommonAncestor) {
if (parentFrame == aAncestorFrame) {
return PR_TRUE;
}
parentFrame = parentFrame->GetParent();
}
return PR_FALSE;
}
// static
PRInt32
nsLayoutUtils::DoCompareTreePosition(nsIContent* aContent1,
nsIContent* aContent2,
PRInt32 aIf1Ancestor,
PRInt32 aIf2Ancestor,
nsIContent* aCommonAncestor)
{
NS_PRECONDITION(aContent1, "aContent1 must not be null");
NS_PRECONDITION(aContent2, "aContent2 must not be null");
nsAutoVoidArray content1Ancestors;
nsINode* c1;
for (c1 = aContent1; c1 && c1 != aCommonAncestor; c1 = c1->GetNodeParent()) {
content1Ancestors.AppendElement(c1);
}
if (!c1 && aCommonAncestor) {
// So, it turns out aCommonAncestor was not an ancestor of c1. Oops.
// Never mind. We can continue as if aCommonAncestor was null.
aCommonAncestor = nsnull;
}
nsAutoVoidArray content2Ancestors;
nsINode* c2;
for (c2 = aContent2; c2 && c2 != aCommonAncestor; c2 = c2->GetNodeParent()) {
content2Ancestors.AppendElement(c2);
}
if (!c2 && aCommonAncestor) {
// So, it turns out aCommonAncestor was not an ancestor of c2.
// We need to retry with no common ancestor hint.
return DoCompareTreePosition(aContent1, aContent2,
aIf1Ancestor, aIf2Ancestor, nsnull);
}
int last1 = content1Ancestors.Count() - 1;
int last2 = content2Ancestors.Count() - 1;
nsINode* content1Ancestor = nsnull;
nsINode* content2Ancestor = nsnull;
while (last1 >= 0 && last2 >= 0
&& ((content1Ancestor = NS_STATIC_CAST(nsINode*, content1Ancestors.ElementAt(last1)))
== (content2Ancestor = NS_STATIC_CAST(nsINode*, content2Ancestors.ElementAt(last2))))) {
last1--;
last2--;
}
if (last1 < 0) {
if (last2 < 0) {
NS_ASSERTION(aContent1 == aContent2, "internal error?");
return 0;
}
// aContent1 is an ancestor of aContent2
return aIf1Ancestor;
}
if (last2 < 0) {
// aContent2 is an ancestor of aContent1
return aIf2Ancestor;
}
// content1Ancestor != content2Ancestor, so they must be siblings with the same parent
nsINode* parent = content1Ancestor->GetNodeParent();
NS_ASSERTION(parent, "no common ancestor at all???");
if (!parent) { // different documents??
return 0;
}
PRInt32 index1 = parent->IndexOf(content1Ancestor);
PRInt32 index2 = parent->IndexOf(content2Ancestor);
if (index1 < 0 || index2 < 0) {
// one of them must be anonymous; we can't determine the order
return 0;
}
return index1 - index2;
}
// static
nsIFrame* nsLayoutUtils::GetLastSibling(nsIFrame* aFrame) {
if (!aFrame) {
return nsnull;
}
nsIFrame* next;
while ((next = aFrame->GetNextSibling()) != nsnull) {
aFrame = next;
}
return aFrame;
}
// static
nsIView*
nsLayoutUtils::FindSiblingViewFor(nsIView* aParentView, nsIFrame* aFrame) {
nsIFrame* parentViewFrame = NS_STATIC_CAST(nsIFrame*, aParentView->GetClientData());
nsIContent* parentViewContent = parentViewFrame ? parentViewFrame->GetContent() : nsnull;
for (nsIView* insertBefore = aParentView->GetFirstChild(); insertBefore;
insertBefore = insertBefore->GetNextSibling()) {
nsIFrame* f = NS_STATIC_CAST(nsIFrame*, insertBefore->GetClientData());
if (!f) {
// this view could be some anonymous view attached to a meaningful parent
for (nsIView* searchView = insertBefore->GetParent(); searchView;
searchView = searchView->GetParent()) {
f = NS_STATIC_CAST(nsIFrame*, searchView->GetClientData());
if (f) {
break;
}
}
NS_ASSERTION(f, "Can't find a frame anywhere!");
}
if (!f || !aFrame->GetContent() || !f->GetContent() ||
CompareTreePosition(aFrame->GetContent(), f->GetContent(), parentViewContent) > 0) {
// aFrame's content is after f's content (or we just don't know),
// so put our view before f's view
return insertBefore;
}
}
return nsnull;
}
//static
nsIScrollableFrame*
nsLayoutUtils::GetScrollableFrameFor(nsIFrame *aScrolledFrame)
{
nsIFrame *frame = aScrolledFrame->GetParent();
if (!frame) {
return nsnull;
}
nsIScrollableFrame *sf;
CallQueryInterface(frame, &sf);
return sf;
}
//static
nsIScrollableFrame*
nsLayoutUtils::GetScrollableFrameFor(nsIScrollableView *aScrollableView)
{
nsIFrame *frame = GetFrameFor(aScrollableView->View()->GetParent());
if (frame) {
nsIScrollableFrame *sf;
CallQueryInterface(frame, &sf);
return sf;
}
return nsnull;
}
//static
nsPresContext::ScrollbarStyles
nsLayoutUtils::ScrollbarStylesOfView(nsIScrollableView *aScrollableView)
{
nsIScrollableFrame *sf = GetScrollableFrameFor(aScrollableView);
return sf ? sf->GetScrollbarStyles() :
nsPresContext::ScrollbarStyles(NS_STYLE_OVERFLOW_HIDDEN,
NS_STYLE_OVERFLOW_HIDDEN);
}
// static
nsIScrollableView*
nsLayoutUtils::GetNearestScrollingView(nsIView* aView, Direction aDirection)
{
// If aDirection is eEither, find first view with a scrolllable frame.
// Otherwise, find the first view that has a scrollable frame whose
// ScrollbarStyles is not NS_STYLE_OVERFLOW_HIDDEN in aDirection
// and where there is something currently not visible
// that can be scrolled to in aDirection.
NS_ASSERTION(aView, "GetNearestScrollingView expects a non-null view");
nsIScrollableView* scrollableView = nsnull;
for (; aView; aView = aView->GetParent()) {
scrollableView = aView->ToScrollableView();
if (scrollableView) {
nsPresContext::ScrollbarStyles ss =
nsLayoutUtils::ScrollbarStylesOfView(scrollableView);
nsIScrollableFrame *scrollableFrame = GetScrollableFrameFor(scrollableView);
NS_ASSERTION(scrollableFrame, "Must have scrollable frame for view!");
nsMargin margin = scrollableFrame->GetActualScrollbarSizes();
// Get size of total scrollable area
nscoord totalWidth, totalHeight;
scrollableView->GetContainerSize(&totalWidth, &totalHeight);
// Get size of currently visible area
nsSize visibleSize = aView->GetBounds().Size();
// aDirection can be eHorizontal, eVertical, or eEither
// If scrolling in a specific direction, require visible scrollbars or
// something to scroll to in that direction.
if (aDirection != eHorizontal &&
ss.mVertical != NS_STYLE_OVERFLOW_HIDDEN &&
(aDirection == eEither || totalHeight > visibleSize.height || margin.LeftRight()))
break;
if (aDirection != eVertical &&
ss.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN &&
(aDirection == eEither || totalWidth > visibleSize.width || margin.TopBottom()))
break;
}
}
return scrollableView;
}
nsPoint
nsLayoutUtils::GetDOMEventCoordinatesRelativeTo(nsIDOMEvent* aDOMEvent, nsIFrame* aFrame)
{
nsCOMPtr<nsIPrivateDOMEvent> privateEvent(do_QueryInterface(aDOMEvent));
NS_ASSERTION(privateEvent, "bad implementation");
if (!privateEvent)
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
nsEvent* event;
nsresult rv = privateEvent->GetInternalNSEvent(&event);
if (NS_FAILED(rv))
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
return GetEventCoordinatesRelativeTo(event, aFrame);
}
nsPoint
nsLayoutUtils::GetEventCoordinatesRelativeTo(nsEvent* aEvent, nsIFrame* aFrame)
{
if (!aEvent || (aEvent->eventStructType != NS_MOUSE_EVENT &&
aEvent->eventStructType != NS_MOUSE_SCROLL_EVENT))
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
nsGUIEvent* GUIEvent = NS_STATIC_CAST(nsGUIEvent*, aEvent);
if (!GUIEvent->widget)
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
// If it is, or is a descendant of, an SVG foreignobject frame,
// then we need to do extra work
nsIFrame* rootFrame = aFrame;
for (nsIFrame* f = aFrame; f; f = GetCrossDocParentFrame(f)) {
#ifdef MOZ_SVG_FOREIGNOBJECT
if (f->IsFrameOfType(nsIFrame::eSVGForeignObject)) {
nsSVGForeignObjectFrame* fo = NS_STATIC_CAST(nsSVGForeignObjectFrame*, f);
nsIFrame* outer;
CallQueryInterface(nsSVGUtils::GetOuterSVGFrame(fo), &outer);
return fo->TransformPointFromOuter(
GetEventCoordinatesRelativeTo(aEvent, outer)) -
aFrame->GetOffsetTo(fo);
}
#endif
rootFrame = f;
}
nsIView* rootView = rootFrame->GetView();
if (!rootView)
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
nsPoint widgetToView = TranslateWidgetToView(rootFrame->GetPresContext(),
GUIEvent->widget, GUIEvent->refPoint,
rootView);
if (widgetToView == nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE))
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
return widgetToView - aFrame->GetOffsetTo(rootFrame);
}
nsPoint
nsLayoutUtils::GetEventCoordinatesForNearestView(nsEvent* aEvent,
nsIFrame* aFrame,
nsIView** aView)
{
if (!aEvent || (aEvent->eventStructType != NS_MOUSE_EVENT &&
aEvent->eventStructType != NS_MOUSE_SCROLL_EVENT))
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
nsGUIEvent* GUIEvent = NS_STATIC_CAST(nsGUIEvent*, aEvent);
if (!GUIEvent->widget)
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
nsPoint viewToFrame;
nsIView* frameView;
aFrame->GetOffsetFromView(viewToFrame, &frameView);
if (aView)
*aView = frameView;
return TranslateWidgetToView(aFrame->GetPresContext(), GUIEvent->widget,
GUIEvent->refPoint, frameView);
}
nsPoint
nsLayoutUtils::TranslateWidgetToView(nsPresContext* aPresContext,
nsIWidget* aWidget, nsIntPoint aPt,
nsIView* aView)
{
nsIView* baseView = nsIView::GetViewFor(aWidget);
if (!baseView)
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
nsPoint viewToWidget;
nsIWidget* wid = baseView->GetNearestWidget(&viewToWidget);
NS_ASSERTION(aWidget == wid, "Clashing widgets");
float pixelsToTwips = aPresContext->PixelsToTwips();
nsPoint refPointTwips(NSIntPixelsToTwips(aPt.x, pixelsToTwips),
NSIntPixelsToTwips(aPt.y, pixelsToTwips));
return refPointTwips - viewToWidget - aView->GetOffsetTo(baseView);
}
// Combine aNewBreakType with aOrigBreakType, but limit the break types
// to NS_STYLE_CLEAR_LEFT, RIGHT, LEFT_AND_RIGHT.
PRUint8
nsLayoutUtils::CombineBreakType(PRUint8 aOrigBreakType,
PRUint8 aNewBreakType)
{
PRUint8 breakType = aOrigBreakType;
switch(breakType) {
case NS_STYLE_CLEAR_LEFT:
if ((NS_STYLE_CLEAR_RIGHT == aNewBreakType) ||
(NS_STYLE_CLEAR_LEFT_AND_RIGHT == aNewBreakType)) {
breakType = NS_STYLE_CLEAR_LEFT_AND_RIGHT;
}
break;
case NS_STYLE_CLEAR_RIGHT:
if ((NS_STYLE_CLEAR_LEFT == aNewBreakType) ||
(NS_STYLE_CLEAR_LEFT_AND_RIGHT == aNewBreakType)) {
breakType = NS_STYLE_CLEAR_LEFT_AND_RIGHT;
}
break;
case NS_STYLE_CLEAR_NONE:
if ((NS_STYLE_CLEAR_LEFT == aNewBreakType) ||
(NS_STYLE_CLEAR_RIGHT == aNewBreakType) ||
(NS_STYLE_CLEAR_LEFT_AND_RIGHT == aNewBreakType)) {
breakType = aNewBreakType;
}
}
return breakType;
}
PRBool
nsLayoutUtils::IsInitialContainingBlock(nsIFrame* aFrame)
{
return aFrame ==
aFrame->GetPresContext()->PresShell()->FrameConstructor()->GetInitialContainingBlock();
}
#ifdef DEBUG
#include <stdio.h>
static PRBool gDumpPaintList = PR_FALSE;
static PRBool gDumpEventList = PR_FALSE;
static PRBool gDumpRepaintRegionForCopy = PR_FALSE;
#endif
nsIFrame*
nsLayoutUtils::GetFrameForPoint(nsIFrame* aFrame, nsPoint aPt)
{
nsDisplayListBuilder builder(aFrame, PR_TRUE, PR_FALSE);
nsDisplayList list;
nsRect target(aPt, nsSize(1, 1));
builder.EnterPresShell(aFrame, target);
nsresult rv =
aFrame->BuildDisplayListForStackingContext(&builder, target, &list);
builder.LeavePresShell(aFrame, target);
NS_ENSURE_SUCCESS(rv, nsnull);
#ifdef DEBUG
if (gDumpEventList) {
fprintf(stderr, "Event handling --- (%d,%d):\n", aPt.x, aPt.y);
nsIFrameDebug::PrintDisplayList(&builder, list);
}
#endif
nsIFrame* result = list.HitTest(&builder, aPt);
list.DeleteAll();
return result;
}
/**
* A simple display item that just renders a solid color across the entire
* visible area.
*/
class nsDisplaySolidColor : public nsDisplayItem {
public:
nsDisplaySolidColor(nsIFrame* aFrame, nscolor aColor)
: nsDisplayItem(aFrame), mColor(aColor) {
MOZ_COUNT_CTOR(nsDisplaySolidColor);
}
#ifdef NS_BUILD_REFCNT_LOGGING
virtual ~nsDisplaySolidColor() {
MOZ_COUNT_DTOR(nsDisplaySolidColor);
}
#endif
virtual void Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx,
const nsRect& aDirtyRect);
NS_DISPLAY_DECL_NAME("SolidColor")
private:
nscolor mColor;
};
void nsDisplaySolidColor::Paint(nsDisplayListBuilder* aBuilder,
nsIRenderingContext* aCtx, const nsRect& aDirtyRect)
{
aCtx->SetColor(mColor);
aCtx->FillRect(aDirtyRect);
}
nsresult
nsLayoutUtils::PaintFrame(nsIRenderingContext* aRenderingContext, nsIFrame* aFrame,
const nsRegion& aDirtyRegion, nscolor aBackground)
{
nsDisplayListBuilder builder(aFrame, PR_FALSE, PR_TRUE);
nsDisplayList list;
nsRect dirtyRect = aDirtyRegion.GetBounds();
builder.EnterPresShell(aFrame, dirtyRect);
nsresult rv =
aFrame->BuildDisplayListForStackingContext(&builder, dirtyRect, &list);
builder.LeavePresShell(aFrame, dirtyRect);
NS_ENSURE_SUCCESS(rv, rv);
if (NS_GET_A(aBackground) > 0) {
// Fill the visible area with a background color. In the common case,
// the visible area is entirely covered by the background of the root
// document (at least!) so this will be removed by the optimizer. In some
// cases we might not have a root frame, so this will prevent garbage
// from being drawn.
rv = list.AppendNewToBottom(new (&builder) nsDisplaySolidColor(aFrame, aBackground));
NS_ENSURE_SUCCESS(rv, rv);
}
#ifdef DEBUG
if (gDumpPaintList) {
fprintf(stderr, "Painting --- before optimization (dirty %d,%d,%d,%d):\n",
dirtyRect.x, dirtyRect.y, dirtyRect.width, dirtyRect.height);
nsIFrameDebug::PrintDisplayList(&builder, list);
}
#endif
nsRegion visibleRegion = aDirtyRegion;
list.OptimizeVisibility(&builder, &visibleRegion);
#ifdef DEBUG
if (gDumpPaintList) {
fprintf(stderr, "Painting --- after optimization:\n");
nsIFrameDebug::PrintDisplayList(&builder, list);
}
#endif
list.Paint(&builder, aRenderingContext, aDirtyRegion.GetBounds());
// Flush the list so we don't trigger the IsEmpty-on-destruction assertion
list.DeleteAll();
return NS_OK;
}
static void
AccumulateItemInRegion(nsRegion* aRegion, const nsRect& aAreaRect,
const nsRect& aItemRect, nsDisplayItem* aItem)
{
nsRect damageRect;
if (damageRect.IntersectRect(aAreaRect, aItemRect)) {
#ifdef DEBUG
if (gDumpRepaintRegionForCopy) {
fprintf(stderr, "Adding rect %d,%d,%d,%d for frame %p\n",
damageRect.x, damageRect.y, damageRect.width, damageRect.height,
(void*)aItem->GetUnderlyingFrame());
}
#endif
aRegion->Or(*aRegion, damageRect);
}
}
static void
AddItemsToRegion(nsDisplayListBuilder* aBuilder, nsDisplayList* aList,
const nsRect& aRect, const nsRect& aClipRect, nsPoint aDelta,
nsRegion* aRegion)
{
for (nsDisplayItem* item = aList->GetBottom(); item; item = item->GetAbove()) {
nsDisplayList* sublist = item->GetList();
if (sublist) {
if (item->GetType() == nsDisplayItem::TYPE_CLIP) {
nsRect clip;
clip.IntersectRect(aClipRect, NS_STATIC_CAST(nsDisplayClip*, item)->GetClipRect());
AddItemsToRegion(aBuilder, sublist, aRect, clip, aDelta, aRegion);
} else {
// opacity, or a generic sublist
AddItemsToRegion(aBuilder, sublist, aRect, aClipRect, aDelta, aRegion);
}
} else {
// Items left in the list are either IsVaryingRelativeToFrame
// or !IsMovingFrame (i.e., not in the moving subtree)
nsRect r;
if (r.IntersectRect(aClipRect, item->GetBounds(aBuilder))) {
PRBool inMovingSubtree = PR_FALSE;
if (item->IsVaryingRelativeToFrame(aBuilder, aBuilder->GetRootMovingFrame())) {
nsIFrame* f = item->GetUnderlyingFrame();
NS_ASSERTION(f, "Must have an underlying frame for leaf item");
inMovingSubtree = aBuilder->IsMovingFrame(f);
AccumulateItemInRegion(aRegion, aRect + aDelta, r, item);
}
if (!inMovingSubtree) {
// if it's uniform and it includes both the old and new areas, then
// we don't need to paint it
PRBool skip = r.Contains(aRect) && r.Contains(aRect + aDelta) &&
item->IsUniform(aBuilder);
if (!skip) {
// area where a non-moving element is visible must be repainted
AccumulateItemInRegion(aRegion, aRect + aDelta, r, item);
// we may have bitblitted an area that was painted by a non-moving
// element. This bitblitted data is invalid and was copied to
// "r + aDelta".
AccumulateItemInRegion(aRegion, aRect + aDelta, r + aDelta, item);
}
}
}
}
}
}
nsresult
nsLayoutUtils::ComputeRepaintRegionForCopy(nsIFrame* aRootFrame,
nsIFrame* aMovingFrame,
nsPoint aDelta,
const nsRect& aCopyRect,
nsRegion* aRepaintRegion)
{
// Build the 'after' display list over the whole area of interest.
// Frames under aMovingFrame will not be allowed to affect (clip or cover)
// non-moving frame display items ... then we can be sure the non-moving
// frame display items we get are the same ones we would have gotten if
// we had constructed the 'before' display list.
// (We have to build the 'after' display list because the frame/view
// hierarchy has already been updated for the move.)
nsRect rect;
rect.UnionRect(aCopyRect, aCopyRect + aDelta);
nsDisplayListBuilder builder(aRootFrame, PR_FALSE, PR_TRUE, aMovingFrame);
nsDisplayList list;
builder.EnterPresShell(aRootFrame, rect);
nsresult rv =
aRootFrame->BuildDisplayListForStackingContext(&builder, rect, &list);
builder.LeavePresShell(aRootFrame, rect);
NS_ENSURE_SUCCESS(rv, rv);
#ifdef DEBUG
if (gDumpRepaintRegionForCopy) {
fprintf(stderr,
"Repaint region for copy --- before optimization (area %d,%d,%d,%d, frame %p):\n",
rect.x, rect.y, rect.width, rect.height, (void*)aMovingFrame);
nsIFrameDebug::PrintDisplayList(&builder, list);
}
#endif
// Optimize for visibility, but frames under aMovingFrame will not be
// considered opaque, so they don't cover non-moving frames.
nsRegion visibleRegion(aCopyRect);
visibleRegion.Or(visibleRegion, aCopyRect + aDelta);
list.OptimizeVisibility(&builder, &visibleRegion);
#ifdef DEBUG
if (gDumpRepaintRegionForCopy) {
fprintf(stderr, "Repaint region for copy --- after optimization:\n");
nsIFrameDebug::PrintDisplayList(&builder, list);
}
#endif
aRepaintRegion->SetEmpty();
// Any visible non-moving display items get added to the repaint region
// a) at their current location and b) offset by -aPt (their position in
// the 'before' display list) (unless they're uniform and we can exclude them).
// Also, any visible position-varying display items get added to the
// repaint region. All these areas are confined to aCopyRect+aDelta.
// We could do more work here: e.g., do another optimize-visibility pass
// with the moving items taken into account, either on the before-list
// or the after-list, or even both if we cloned the display lists ... but
// it's probably not worth it.
AddItemsToRegion(&builder, &list, aCopyRect, rect, aDelta, aRepaintRegion);
// Flush the list so we don't trigger the IsEmpty-on-destruction assertion
list.DeleteAll();
return NS_OK;
}
nsresult
nsLayoutUtils::CreateOffscreenContext(nsIDeviceContext* deviceContext, nsIDrawingSurface* surface,
const nsRect& aRect, nsIRenderingContext** aResult)
{
nsresult rv;
nsIRenderingContext *context = nsnull;
rv = deviceContext->CreateRenderingContext(surface, context);
NS_ENSURE_SUCCESS(rv, rv);
// always initialize clipping, linux won't draw images otherwise.
nsRect clip(0, 0, aRect.width, aRect.height);
context->SetClipRect(clip, nsClipCombine_kReplace);
context->Translate(-aRect.x, -aRect.y);
*aResult = context;
return NS_OK;
}
PRInt32
nsLayoutUtils::GetZIndex(nsIFrame* aFrame) {
if (!aFrame->GetStyleDisplay()->IsPositioned())
return 0;
const nsStylePosition* position =
aFrame->GetStylePosition();
if (position->mZIndex.GetUnit() == eStyleUnit_Integer)
return position->mZIndex.GetIntValue();
// sort the auto and 0 elements together
return 0;
}
/**
* Uses a binary search for find where the cursor falls in the line of text
* It also keeps track of the part of the string that has already been measured
* so it doesn't have to keep measuring the same text over and over
*
* @param "aBaseWidth" contains the width in twips of the portion
* of the text that has already been measured, and aBaseInx contains
* the index of the text that has already been measured.
*
* @param aTextWidth returns the (in twips) the length of the text that falls
* before the cursor aIndex contains the index of the text where the cursor falls
*/
PRBool
nsLayoutUtils::BinarySearchForPosition(nsIRenderingContext* aRendContext,
const PRUnichar* aText,
PRInt32 aBaseWidth,
PRInt32 aBaseInx,
PRInt32 aStartInx,
PRInt32 aEndInx,
PRInt32 aCursorPos,
PRInt32& aIndex,
PRInt32& aTextWidth)
{
PRInt32 range = aEndInx - aStartInx;
if ((range == 1) || (range == 2 && IS_HIGH_SURROGATE(aText[aStartInx]))) {
aIndex = aStartInx + aBaseInx;
aRendContext->GetWidth(aText, aIndex, aTextWidth);
return PR_TRUE;
}
PRInt32 inx = aStartInx + (range / 2);
// Make sure we don't leave a dangling low surrogate
if (IS_HIGH_SURROGATE(aText[inx-1]))
inx++;
PRInt32 textWidth = 0;
aRendContext->GetWidth(aText, inx, textWidth);
PRInt32 fullWidth = aBaseWidth + textWidth;
if (fullWidth == aCursorPos) {
aTextWidth = textWidth;
aIndex = inx;
return PR_TRUE;
} else if (aCursorPos < fullWidth) {
aTextWidth = aBaseWidth;
if (BinarySearchForPosition(aRendContext, aText, aBaseWidth, aBaseInx, aStartInx, inx, aCursorPos, aIndex, aTextWidth)) {
return PR_TRUE;
}
} else {
aTextWidth = fullWidth;
if (BinarySearchForPosition(aRendContext, aText, aBaseWidth, aBaseInx, inx, aEndInx, aCursorPos, aIndex, aTextWidth)) {
return PR_TRUE;
}
}
return PR_FALSE;
}
void
nsLayoutUtils::ScrollIntoView(nsIFormControlFrame* aFormFrame)
{
NS_ASSERTION(aFormFrame, "Null frame passed into ScrollIntoView");
nsIFrame* frame = nsnull;
CallQueryInterface(aFormFrame, &frame);
NS_ASSERTION(frame, "Form frame did not implement nsIFrame.");
if (frame) {
nsIPresShell* presShell = frame->GetPresContext()->GetPresShell();
if (presShell) {
presShell->ScrollFrameIntoView(frame,
NS_PRESSHELL_SCROLL_IF_NOT_VISIBLE,
NS_PRESSHELL_SCROLL_IF_NOT_VISIBLE);
}
}
}
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