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fune/layout/generic/nsHTMLContainerFrame.cpp

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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):
*
* 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 "nsHTMLContainerFrame.h"
#include "nsIRenderingContext.h"
#include "nsPresContext.h"
#include "nsIPresShell.h"
#include "nsStyleContext.h"
#include "nsStyleConsts.h"
#include "nsIContent.h"
#include "nsLayoutAtoms.h"
#include "nsLayoutUtils.h"
#include "nsCSSAnonBoxes.h"
#include "nsIWidget.h"
#include "nsILinkHandler.h"
#include "nsGUIEvent.h"
#include "nsIDocument.h"
#include "nsIURL.h"
#include "nsPlaceholderFrame.h"
#include "nsHTMLParts.h"
#include "nsIView.h"
#include "nsIViewManager.h"
#include "nsIDOMEvent.h"
#include "nsIScrollableView.h"
#include "nsWidgetsCID.h"
#include "nsCOMPtr.h"
#include "nsIDeviceContext.h"
#include "nsIFontMetrics.h"
#include "nsReflowPath.h"
#include "nsCSSFrameConstructor.h"
NS_IMETHODIMP
nsHTMLContainerFrame::Paint(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsFramePaintLayer aWhichLayer,
PRUint32 aFlags)
{
if (NS_FRAME_IS_UNFLOWABLE & mState) {
return NS_OK;
}
// Paint inline element backgrounds in the foreground layer, but
// others in the background (bug 36710). (nsInlineFrame::Paint does
// this differently.)
if (NS_FRAME_PAINT_LAYER_BACKGROUND == aWhichLayer) {
PaintSelf(aPresContext, aRenderingContext, aDirtyRect);
}
PaintChildren(aPresContext, aRenderingContext, aDirtyRect, aWhichLayer, aFlags);
return NS_OK;
}
void
nsHTMLContainerFrame::PaintDecorationsAndChildren(
nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsFramePaintLayer aWhichLayer,
PRBool aIsBlock,
PRUint32 aFlags)
{
// Do standards mode painting of 'text-decoration's: under+overline
// behind children, line-through in front. For Quirks mode, see
// nsTextFrame::PaintTextDecorations. (See bug 1777.)
nscolor underColor, overColor, strikeColor;
PRUint8 decorations = NS_STYLE_TEXT_DECORATION_NONE;
nsCOMPtr<nsIFontMetrics> fm;
PRBool isVisible;
if (eCompatibility_NavQuirks != aPresContext->CompatibilityMode() &&
NS_FRAME_PAINT_LAYER_FOREGROUND == aWhichLayer &&
NS_SUCCEEDED(IsVisibleForPainting(aPresContext, aRenderingContext,
PR_TRUE, &isVisible)) &&
isVisible) {
GetTextDecorations(aPresContext, aIsBlock, decorations, underColor,
overColor, strikeColor);
if (decorations & (NS_STYLE_TEXT_DECORATION_UNDERLINE |
NS_STYLE_TEXT_DECORATION_OVERLINE |
NS_STYLE_TEXT_DECORATION_LINE_THROUGH)) {
const nsStyleFont* font = GetStyleFont();
NS_ASSERTION(font->mFont.decorations == NS_FONT_DECORATION_NONE,
"fonts on style structs shouldn't have decorations");
// XXX This is relatively slow and shouldn't need to be used here.
nsCOMPtr<nsIDeviceContext> deviceContext;
aRenderingContext.GetDeviceContext(*getter_AddRefs(deviceContext));
nsCOMPtr<nsIFontMetrics> normalFont;
deviceContext->GetMetricsFor(font->mFont, *getter_AddRefs(fm));
}
if (decorations & NS_STYLE_TEXT_DECORATION_UNDERLINE) {
PaintTextDecorations(aRenderingContext, fm,
NS_STYLE_TEXT_DECORATION_UNDERLINE, underColor);
}
if (decorations & NS_STYLE_TEXT_DECORATION_OVERLINE) {
PaintTextDecorations(aRenderingContext, fm,
NS_STYLE_TEXT_DECORATION_OVERLINE, overColor);
}
}
PaintChildren(aPresContext, aRenderingContext, aDirtyRect,
aWhichLayer, aFlags);
if (decorations & NS_STYLE_TEXT_DECORATION_LINE_THROUGH) {
PaintTextDecorations(aRenderingContext, fm,
NS_STYLE_TEXT_DECORATION_LINE_THROUGH, strikeColor);
}
}
static PRBool
HasTextFrameDescendantOrInFlow(nsPresContext* aPresContext, nsIFrame* aFrame);
void
nsHTMLContainerFrame::GetTextDecorations(nsPresContext* aPresContext,
PRBool aIsBlock,
PRUint8& aDecorations,
nscolor& aUnderColor,
nscolor& aOverColor,
nscolor& aStrikeColor)
{
aDecorations = NS_STYLE_TEXT_DECORATION_NONE;
if (!mStyleContext->HasTextDecorations()) {
// This is a necessary, but not sufficient, condition for text
// decorations.
return;
}
// A mask of all possible decorations.
PRUint8 decorMask = NS_STYLE_TEXT_DECORATION_UNDERLINE |
NS_STYLE_TEXT_DECORATION_OVERLINE |
NS_STYLE_TEXT_DECORATION_LINE_THROUGH;
if (!aIsBlock) {
aDecorations = GetStyleTextReset()->mTextDecoration & decorMask;
if (aDecorations) {
const nsStyleColor* styleColor = GetStyleColor();
aUnderColor = styleColor->mColor;
aOverColor = styleColor->mColor;
aStrikeColor = styleColor->mColor;
}
}
else {
// walk tree
for (nsIFrame *frame = this; frame && decorMask; frame = frame->GetParent()) {
// find text-decorations. "Inherit" from parent *block* frames
nsStyleContext* styleContext = frame->GetStyleContext();
const nsStyleDisplay* styleDisplay = styleContext->GetStyleDisplay();
if (!styleDisplay->IsBlockLevel() &&
styleDisplay->mDisplay != NS_STYLE_DISPLAY_TABLE_CELL) {
// If an inline frame is discovered while walking up the tree,
// we should stop according to CSS3 draft. CSS2 is rather vague
// about this.
break;
}
const nsStyleTextReset* styleText = styleContext->GetStyleTextReset();
PRUint8 decors = decorMask & styleText->mTextDecoration;
if (decors) {
// A *new* text-decoration is found.
nscolor color = styleContext->GetStyleColor()->mColor;
if (NS_STYLE_TEXT_DECORATION_UNDERLINE & decors) {
aUnderColor = color;
decorMask &= ~NS_STYLE_TEXT_DECORATION_UNDERLINE;
aDecorations |= NS_STYLE_TEXT_DECORATION_UNDERLINE;
}
if (NS_STYLE_TEXT_DECORATION_OVERLINE & decors) {
aOverColor = color;
decorMask &= ~NS_STYLE_TEXT_DECORATION_OVERLINE;
aDecorations |= NS_STYLE_TEXT_DECORATION_OVERLINE;
}
if (NS_STYLE_TEXT_DECORATION_LINE_THROUGH & decors) {
aStrikeColor = color;
decorMask &= ~NS_STYLE_TEXT_DECORATION_LINE_THROUGH;
aDecorations |= NS_STYLE_TEXT_DECORATION_LINE_THROUGH;
}
}
}
}
if (aDecorations) {
// If this frame contains no text, we're required to ignore this property
if (!HasTextFrameDescendantOrInFlow(aPresContext, this)) {
aDecorations = NS_STYLE_TEXT_DECORATION_NONE;
}
}
}
static PRBool
HasTextFrameDescendant(nsPresContext* aPresContext, nsIFrame* aParent)
{
for (nsIFrame* kid = aParent->GetFirstChild(nsnull); kid;
kid = kid->GetNextSibling())
{
if (kid->GetType() == nsLayoutAtoms::textFrame) {
// This is only a candidate. We need to determine if this text
// frame is empty, as in containing only (non-pre) whitespace.
// See bug 20163.
if (!kid->IsEmpty()) {
return PR_TRUE;
}
}
if (HasTextFrameDescendant(aPresContext, kid)) {
return PR_TRUE;
}
}
return PR_FALSE;
}
static PRBool
HasTextFrameDescendantOrInFlow(nsPresContext* aPresContext, nsIFrame* aFrame)
{
for (nsIFrame *f = aFrame->GetFirstInFlow(); f; f = f->GetNextInFlow()) {
if (HasTextFrameDescendant(aPresContext, f))
return PR_TRUE;
}
return PR_FALSE;
}
#if (NS_SIDE_TOP == 0) && (NS_SIDE_RIGHT == 1) && (NS_SIDE_BOTTOM == 2) && (NS_SIDE_LEFT == 3)
static nscoord nsMargin::* const nsMarginSides[4] = {
&nsMargin::top,
&nsMargin::right,
&nsMargin::bottom,
&nsMargin::left,
};
#else
#error "Somebody changed the side constants."
#endif
/*virtual*/ void
nsHTMLContainerFrame::PaintTextDecorationLines(
nsIRenderingContext& aRenderingContext,
nscolor aColor,
nscoord aOffset,
nscoord aAscent,
nscoord aSize)
{
nsMargin bp;
CalcBorderPadding(bp);
PRIntn skip = GetSkipSides();
NS_FOR_CSS_SIDES(side) {
if (skip & (1 << side)) {
bp.*(nsMarginSides[side]) = 0;
}
}
aRenderingContext.SetColor(aColor);
nscoord innerWidth = mRect.width - bp.left - bp.right;
aRenderingContext.FillRect(bp.left,
bp.top + aAscent - aOffset, innerWidth, aSize);
}
void
nsHTMLContainerFrame::PaintTextDecorations(
nsIRenderingContext& aRenderingContext,
nsIFontMetrics* aFontMetrics,
PRUint8 aDecoration,
nscolor aColor)
{
nscoord ascent, offset, size;
aFontMetrics->GetMaxAscent(ascent);
if (aDecoration &
(NS_STYLE_TEXT_DECORATION_UNDERLINE
| NS_STYLE_TEXT_DECORATION_OVERLINE)) {
aFontMetrics->GetUnderline(offset, size);
if (NS_STYLE_TEXT_DECORATION_UNDERLINE & aDecoration) {
PaintTextDecorationLines(aRenderingContext, aColor, offset, ascent, size);
}
else if (NS_STYLE_TEXT_DECORATION_OVERLINE & aDecoration) {
PaintTextDecorationLines(aRenderingContext, aColor, ascent, ascent, size);
}
}
else if (NS_STYLE_TEXT_DECORATION_LINE_THROUGH & aDecoration) {
aFontMetrics->GetStrikeout(offset, size);
PaintTextDecorationLines(aRenderingContext, aColor, offset, ascent, size);
}
}
/**
* Create a next-in-flow for aFrame. Will return the newly created
* frame in aNextInFlowResult <b>if and only if</b> a new frame is
* created; otherwise nsnull is returned in aNextInFlowResult.
*/
nsresult
nsHTMLContainerFrame::CreateNextInFlow(nsPresContext* aPresContext,
nsIFrame* aOuterFrame,
nsIFrame* aFrame,
nsIFrame*& aNextInFlowResult)
{
aNextInFlowResult = nsnull;
nsIFrame* nextInFlow = aFrame->GetNextInFlow();
if (nsnull == nextInFlow) {
// Create a continuation frame for the child frame and insert it
// into our lines child list.
nsIFrame* nextFrame = aFrame->GetNextSibling();
aPresContext->PresShell()->FrameConstructor()->
CreateContinuingFrame(aPresContext, aFrame, aOuterFrame, &nextInFlow);
if (nsnull == nextInFlow) {
return NS_ERROR_OUT_OF_MEMORY;
}
aFrame->SetNextSibling(nextInFlow);
nextInFlow->SetNextSibling(nextFrame);
NS_FRAME_LOG(NS_FRAME_TRACE_NEW_FRAMES,
("nsHTMLContainerFrame::MaybeCreateNextInFlow: frame=%p nextInFlow=%p",
aFrame, nextInFlow));
aNextInFlowResult = nextInFlow;
}
return NS_OK;
}
static nsresult
ReparentFrameViewTo(nsIFrame* aFrame,
nsIViewManager* aViewManager,
nsIView* aNewParentView,
nsIView* aOldParentView)
{
// XXX What to do about placeholder views for "position: fixed" elements?
// They should be reparented too.
// Does aFrame have a view?
if (aFrame->HasView()) {
nsIView* view = aFrame->GetView();
// Verify that the current parent view is what we think it is
//nsIView* parentView;
//NS_ASSERTION(parentView == aOldParentView, "unexpected parent view");
aViewManager->RemoveChild(view);
// The view will remember the Z-order and other attributes that have been set on it.
nsIView* insertBefore = nsLayoutUtils::FindSiblingViewFor(aNewParentView, aFrame);
aViewManager->InsertChild(aNewParentView, view, insertBefore, insertBefore != nsnull);
} else {
PRInt32 listIndex = 0;
nsIAtom* listName = nsnull;
// This loop iterates through every child list name, and also
// executes once with listName == nsnull.
do {
// Iterate the child frames, and check each child frame to see if it has
// a view
nsIFrame* childFrame = aFrame->GetFirstChild(listName);
for (; childFrame; childFrame = childFrame->GetNextSibling()) {
ReparentFrameViewTo(childFrame, aViewManager,
aNewParentView, aOldParentView);
}
listName = aFrame->GetAdditionalChildListName(listIndex++);
} while (listName);
}
return NS_OK;
}
nsresult
nsHTMLContainerFrame::ReparentFrameView(nsPresContext* aPresContext,
nsIFrame* aChildFrame,
nsIFrame* aOldParentFrame,
nsIFrame* aNewParentFrame)
{
NS_PRECONDITION(aChildFrame, "null child frame pointer");
NS_PRECONDITION(aOldParentFrame, "null old parent frame pointer");
NS_PRECONDITION(aNewParentFrame, "null new parent frame pointer");
NS_PRECONDITION(aOldParentFrame != aNewParentFrame, "same old and new parent frame");
// This code is called often and we need it to be as fast as possible, so
// see if we can trivially detect that no work needs to be done
if (!aChildFrame->HasView()) {
// Child frame doesn't have a view. See if it has any child frames
if (!aChildFrame->GetFirstChild(nsnull)) {
return NS_OK;
}
}
// See if either the old parent frame or the new parent frame have a view
while (!aOldParentFrame->HasView() && !aNewParentFrame->HasView()) {
// Walk up both the old parent frame and the new parent frame nodes
// stopping when we either find a common parent or views for one
// or both of the frames.
//
// This works well in the common case where we push/pull and the old parent
// frame and the new parent frame are part of the same flow. They will
// typically be the same distance (height wise) from the
aOldParentFrame = aOldParentFrame->GetParent();
aNewParentFrame = aNewParentFrame->GetParent();
// We should never walk all the way to the root frame without finding
// a view
NS_ASSERTION(aOldParentFrame && aNewParentFrame, "didn't find view");
// See if we reached a common ancestor
if (aOldParentFrame == aNewParentFrame) {
break;
}
}
// See if we found a common parent frame
if (aOldParentFrame == aNewParentFrame) {
// We found a common parent and there are no views between the old parent
// and the common parent or the new parent frame and the common parent.
// Because neither the old parent frame nor the new parent frame have views,
// then any child views don't need reparenting
return NS_OK;
}
// We found views for one or both of the ancestor frames before we
// found a common ancestor.
nsIView* oldParentView = aOldParentFrame->GetClosestView();
nsIView* newParentView = aNewParentFrame->GetClosestView();
// See if the old parent frame and the new parent frame are in the
// same view sub-hierarchy. If they are then we don't have to do
// anything
if (oldParentView != newParentView) {
// They're not so we need to reparent any child views
return ReparentFrameViewTo(aChildFrame, oldParentView->GetViewManager(), newParentView,
oldParentView);
}
return NS_OK;
}
nsresult
nsHTMLContainerFrame::ReparentFrameViewList(nsPresContext* aPresContext,
nsIFrame* aChildFrameList,
nsIFrame* aOldParentFrame,
nsIFrame* aNewParentFrame)
{
NS_PRECONDITION(aChildFrameList, "null child frame list");
NS_PRECONDITION(aOldParentFrame, "null old parent frame pointer");
NS_PRECONDITION(aNewParentFrame, "null new parent frame pointer");
NS_PRECONDITION(aOldParentFrame != aNewParentFrame, "same old and new parent frame");
// See if either the old parent frame or the new parent frame have a view
while (!aOldParentFrame->HasView() && !aNewParentFrame->HasView()) {
// Walk up both the old parent frame and the new parent frame nodes
// stopping when we either find a common parent or views for one
// or both of the frames.
//
// This works well in the common case where we push/pull and the old parent
// frame and the new parent frame are part of the same flow. They will
// typically be the same distance (height wise) from the
aOldParentFrame = aOldParentFrame->GetParent();
aNewParentFrame = aNewParentFrame->GetParent();
// We should never walk all the way to the root frame without finding
// a view
NS_ASSERTION(aOldParentFrame && aNewParentFrame, "didn't find view");
// See if we reached a common ancestor
if (aOldParentFrame == aNewParentFrame) {
break;
}
}
// See if we found a common parent frame
if (aOldParentFrame == aNewParentFrame) {
// We found a common parent and there are no views between the old parent
// and the common parent or the new parent frame and the common parent.
// Because neither the old parent frame nor the new parent frame have views,
// then any child views don't need reparenting
return NS_OK;
}
// We found views for one or both of the ancestor frames before we
// found a common ancestor.
nsIView* oldParentView = aOldParentFrame->GetClosestView();
nsIView* newParentView = aNewParentFrame->GetClosestView();
// See if the old parent frame and the new parent frame are in the
// same view sub-hierarchy. If they are then we don't have to do
// anything
if (oldParentView != newParentView) {
nsIViewManager* viewManager = oldParentView->GetViewManager();
// They're not so we need to reparent any child views
for (nsIFrame* f = aChildFrameList; f; f = f->GetNextSibling()) {
ReparentFrameViewTo(f, viewManager, newParentView,
oldParentView);
}
}
return NS_OK;
}
nsresult
nsHTMLContainerFrame::CreateViewForFrame(nsIFrame* aFrame,
nsIFrame* aContentParentFrame,
PRBool aForce)
{
if (aFrame->HasView()) {
return NS_OK;
}
// If we don't yet have a view, see if we need a view
if (!(aForce || FrameNeedsView(aFrame))) {
// don't need a view
return NS_OK;
}
// Create a view
nsIFrame* parent = aFrame->GetAncestorWithView();
NS_ASSERTION(parent, "GetParentWithView failed");
nsIView* parentView = parent->GetView();
NS_ASSERTION(parentView, "no parent with view");
nsIViewManager* viewManager = parentView->GetViewManager();
NS_ASSERTION(viewManager, "null view manager");
// Create a view
nsIView* view = viewManager->CreateView(aFrame->GetRect(), parentView);
if (!view)
return NS_ERROR_OUT_OF_MEMORY;
SyncFrameViewProperties(aFrame->GetPresContext(), aFrame, nsnull, view);
// Insert the view into the view hierarchy. If the parent view is a
// scrolling view we need to do this differently
nsIScrollableView* scrollingView = parentView->ToScrollableView();
if (scrollingView) {
scrollingView->SetScrolledView(view);
} else {
nsIView* insertBefore = nsLayoutUtils::FindSiblingViewFor(parentView, aFrame);
// we insert this view 'above' the insertBefore view, unless insertBefore is null,
// in which case we want to call with aAbove == PR_FALSE to insert at the beginning
// in document order
viewManager->InsertChild(parentView, view, insertBefore, insertBefore != nsnull);
if (nsnull != aContentParentFrame) {
nsIView* zParentView = aContentParentFrame->GetClosestView();
if (zParentView != parentView) {
insertBefore = nsLayoutUtils::FindSiblingViewFor(zParentView, aFrame);
viewManager->InsertZPlaceholder(zParentView, view, insertBefore, insertBefore != nsnull);
}
}
}
// XXX If it's fixed positioned, then create a widget so it floats
// above the scrolling area
const nsStyleDisplay* display = aFrame->GetStyleContext()->GetStyleDisplay();
if (NS_STYLE_POSITION_FIXED == display->mPosition) {
aFrame->CreateWidgetForView(view);
}
// Reparent views on any child frames (or their descendants) to this
// view. We can just call ReparentFrameViewTo on this frame because
// we know this frame has no view, so it will crawl the children. Also,
// we know that any descendants with views must have 'parentView' as their
// parent view.
ReparentFrameViewTo(aFrame, viewManager, view, parentView);
// Remember our view
aFrame->SetView(view);
NS_FRAME_LOG(NS_FRAME_TRACE_CALLS,
("nsHTMLContainerFrame::CreateViewForFrame: frame=%p view=%p",
aFrame));
return NS_OK;
}
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