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gecko-dev/layout/generic/nsGfxScrollFrame.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):
*/
#include "nsCOMPtr.h"
#include "nsHTMLParts.h"
#include "nsIPresContext.h"
#include "nsIStyleContext.h"
#include "nsIReflowCommand.h"
#include "nsIDeviceContext.h"
#include "nsPageFrame.h"
#include "nsViewsCID.h"
#include "nsIServiceManager.h"
#include "nsIView.h"
#include "nsIViewManager.h"
#include "nsHTMLContainerFrame.h"
#include "nsHTMLIIDs.h"
#include "nsCSSRendering.h"
#include "nsIScrollableView.h"
#include "nsWidgetsCID.h"
#include "nsGfxScrollFrame.h"
#include "nsLayoutAtoms.h"
#include "nsIXMLContent.h"
#include "nsXULAtoms.h"
#include "nsHTMLAtoms.h"
#include "nsINameSpaceManager.h"
#include "nsISupportsArray.h"
#include "nsIDocument.h"
#include "nsIFontMetrics.h"
#include "nsIDocumentObserver.h"
#include "nsIDocument.h"
#include "nsIScrollPositionListener.h"
//#include "nsBoxFrame.h"
#include "nsIElementFactory.h"
#include "nsBoxLayoutState.h"
#include "nsINodeInfo.h"
static NS_DEFINE_IID(kWidgetCID, NS_CHILD_CID);
static NS_DEFINE_IID(kScrollingViewCID, NS_SCROLLING_VIEW_CID);
static NS_DEFINE_IID(kViewCID, NS_VIEW_CID);
static NS_DEFINE_IID(kIViewIID, NS_IVIEW_IID);
static NS_DEFINE_IID(kScrollViewIID, NS_ISCROLLABLEVIEW_IID);
static NS_DEFINE_IID(kIAnonymousContentCreatorIID, NS_IANONYMOUS_CONTENT_CREATOR_IID);
static NS_DEFINE_IID(kIScrollableFrameIID, NS_ISCROLLABLE_FRAME_IID);
//----------------------------------------------------------------------
class nsGfxScrollFrameInner : public nsIDocumentObserver,
public nsIScrollPositionListener {
NS_DECL_ISUPPORTS
public:
nsGfxScrollFrameInner(nsGfxScrollFrame* aOuter);
virtual ~nsGfxScrollFrameInner();
// nsIScrollPositionListener
NS_IMETHOD ScrollPositionWillChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY);
NS_IMETHOD ScrollPositionDidChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY);
// nsIDocumentObserver
NS_IMETHOD BeginUpdate(nsIDocument *aDocument) { return NS_OK; }
NS_IMETHOD EndUpdate(nsIDocument *aDocument) { return NS_OK; }
NS_IMETHOD BeginLoad(nsIDocument *aDocument) { return NS_OK; }
NS_IMETHOD EndLoad(nsIDocument *aDocument) { return NS_OK; }
NS_IMETHOD BeginReflow(nsIDocument *aDocument,
nsIPresShell* aShell) { return NS_OK; }
NS_IMETHOD EndReflow(nsIDocument *aDocument,
nsIPresShell* aShell) { return NS_OK; }
NS_IMETHOD ContentChanged(nsIDocument* aDoc,
nsIContent* aContent,
nsISupports* aSubContent) { return NS_OK; }
NS_IMETHOD ContentStatesChanged(nsIDocument* aDocument,
nsIContent* aContent1,
nsIContent* aContent2) { return NS_OK; }
NS_IMETHOD AttributeChanged(nsIDocument *aDocument,
nsIContent* aContent,
PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aHint);
NS_IMETHOD ContentAppended(nsIDocument *aDocument,
nsIContent* aContainer,
PRInt32 aNewIndexInContainer) { return NS_OK; }
NS_IMETHOD ContentInserted(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aChild,
PRInt32 aIndexInContainer) { return NS_OK; }
NS_IMETHOD ContentReplaced(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aOldChild,
nsIContent* aNewChild,
PRInt32 aIndexInContainer) { return NS_OK; }
NS_IMETHOD ContentRemoved(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aChild,
PRInt32 aIndexInContainer) { return NS_OK; }
NS_IMETHOD StyleSheetAdded(nsIDocument *aDocument,
nsIStyleSheet* aStyleSheet) { return NS_OK; }
NS_IMETHOD StyleSheetRemoved(nsIDocument *aDocument,
nsIStyleSheet* aStyleSheet) { return NS_OK; }
NS_IMETHOD StyleSheetDisabledStateChanged(nsIDocument *aDocument,
nsIStyleSheet* aStyleSheet,
PRBool aDisabled) { return NS_OK; }
NS_IMETHOD StyleRuleChanged(nsIDocument *aDocument,
nsIStyleSheet* aStyleSheet,
nsIStyleRule* aStyleRule,
PRInt32 aHint) { return NS_OK; }
NS_IMETHOD StyleRuleAdded(nsIDocument *aDocument,
nsIStyleSheet* aStyleSheet,
nsIStyleRule* aStyleRule) { return NS_OK; }
NS_IMETHOD StyleRuleRemoved(nsIDocument *aDocument,
nsIStyleSheet* aStyleSheet,
nsIStyleRule* aStyleRule) { return NS_OK; }
NS_IMETHOD DocumentWillBeDestroyed(nsIDocument *aDocument) { mDocument = nsnull; return NS_OK; }
PRBool SetAttribute(nsIBox* aBox, nsIAtom* aAtom, nscoord aSize, PRBool aReflow=PR_TRUE);
PRInt32 GetIntegerAttribute(nsIBox* aFrame, nsIAtom* atom, PRInt32 defaultValue);
nsresult Layout(nsBoxLayoutState& aState);
nsresult LayoutBox(nsBoxLayoutState& aState, nsIBox* aBox, const nsRect& aRect);
PRBool AddRemoveScrollbar (PRBool& aHasScrollbar,
nscoord& aXY,
nscoord& aSize,
nscoord aSbSize,
PRBool aOnRightOrBottom,
PRBool aAdd);
PRBool AddRemoveScrollbar(nsBoxLayoutState& aState,
nsRect& aScrollAreaSize,
PRBool aOnTop,
PRBool aHorizontal,
PRBool aAdd);
PRBool AddHorizontalScrollbar (nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnBottom);
PRBool AddVerticalScrollbar (nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnRight);
PRBool RemoveHorizontalScrollbar(nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnBottom);
PRBool RemoveVerticalScrollbar (nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnRight);
nsIScrollableView* GetScrollableView(nsIPresContext* aPresContext);
void GetScrolledContentSize(nsSize& aSize);
void ScrollbarChanged(nsIPresContext* aPresContext, nscoord aX, nscoord aY);
void SetScrollbarVisibility(nsIBox* aScrollbar, PRBool aVisible);
nsIBox* mHScrollbarBox;
nsIBox* mVScrollbarBox;
nsIBox* mScrollAreaBox;
nscoord mOnePixel;
nsCOMPtr<nsIDocument> mDocument;
nsGfxScrollFrame* mOuter;
nsIScrollableView* mScrollableView;
nsSize mMaxElementSize;
PRBool mNeverHasVerticalScrollbar;
PRBool mNeverHasHorizontalScrollbar;
PRBool mHasVerticalScrollbar;
PRBool mHasHorizontalScrollbar;
PRBool mFirstPass;
PRBool mIsRoot;
PRBool mNeverReflowed;
};
NS_IMPL_ISUPPORTS2(nsGfxScrollFrameInner, nsIDocumentObserver, nsIScrollPositionListener)
nsresult
NS_NewGfxScrollFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame, nsIDocument* aDocument, PRBool aIsRoot)
{
NS_PRECONDITION(aNewFrame, "null OUT ptr");
if (nsnull == aNewFrame) {
return NS_ERROR_NULL_POINTER;
}
nsGfxScrollFrame* it = new (aPresShell) nsGfxScrollFrame(aPresShell, aDocument, aIsRoot);
if (nsnull == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
*aNewFrame = it;
return NS_OK;
}
nsGfxScrollFrame::nsGfxScrollFrame(nsIPresShell* aShell, nsIDocument* aDocument, PRBool aIsRoot):nsBoxFrame(aShell, aIsRoot)
{
mInner = new nsGfxScrollFrameInner(this);
mInner->AddRef();
mInner->mDocument = aDocument;
mPresContext = nsnull;
mInner->mIsRoot = PR_FALSE;
mInner->mNeverReflowed = PR_TRUE;
SetLayoutManager(nsnull);
}
nsGfxScrollFrame::~nsGfxScrollFrame()
{
mInner->mOuter = nsnull;
mInner->Release();
mPresContext = nsnull;
}
/**
* Set the view that we are scrolling within the scrolling view.
*/
NS_IMETHODIMP
nsGfxScrollFrame::SetScrolledFrame(nsIPresContext* aPresContext, nsIFrame *aScrolledFrame)
{
NS_ERROR("Not implemented!");
/*
mFrames.DestroyFrame(aPresContext, mInner->mScrollAreaBox);
mInner->mScrollAreaBox = aScrolledFrame;
mFrames.InsertFrame(nsnull, nsnull, mInner->mScrollAreaBox);
*/
return NS_OK;
}
/**
* Get the view that we are scrolling within the scrolling view.
* @result child view
*/
NS_IMETHODIMP
nsGfxScrollFrame::GetScrolledFrame(nsIPresContext* aPresContext, nsIFrame *&aScrolledFrame) const
{
nsIBox* child = nsnull;
mInner->mScrollAreaBox->GetChildBox(&child);
child->GetFrame(&aScrolledFrame);
return NS_OK;
}
/**
* Gets the size of the area that lies inside the scrollbars but clips the scrolled frame
*/
NS_IMETHODIMP
nsGfxScrollFrame::GetClipSize(nsIPresContext* aPresContext,
nscoord *aWidth,
nscoord *aHeight) const
{
nsRect rect;
mInner->mScrollAreaBox->GetBounds(rect);
*aWidth = rect.width;
*aHeight = rect.height;
return NS_OK;
}
/**
* Get information about whether the vertical and horizontal scrollbars
* are currently visible
*/
NS_IMETHODIMP
nsGfxScrollFrame::GetScrollbarVisibility(nsIPresContext* aPresContext,
PRBool *aVerticalVisible,
PRBool *aHorizontalVisible) const
{
*aVerticalVisible = mInner->mHasVerticalScrollbar;
*aHorizontalVisible = mInner->mHasHorizontalScrollbar;
return NS_OK;
}
NS_IMETHODIMP
nsGfxScrollFrame::GetScrollPosition(nsIPresContext* aContext, nscoord &aX, nscoord& aY) const
{
nsIScrollableView* s = mInner->GetScrollableView(aContext);
return s->GetScrollPosition(aX, aY);
}
NS_IMETHODIMP
nsGfxScrollFrame::ScrollTo(nsIPresContext* aContext, nscoord aX, nscoord aY, PRUint32 aFlags)
{
nsIScrollableView* s = mInner->GetScrollableView(aContext);
return s->ScrollTo(aX, aY, aFlags);
}
/**
* Query whether scroll bars should be displayed all the time, never or
* only when necessary.
* @return current scrollbar selection
*/
NS_IMETHODIMP
nsGfxScrollFrame::GetScrollPreference(nsScrollPref* aScrollPreference) const
{
const nsStyleDisplay* styleDisplay = nsnull;
GetStyleData(eStyleStruct_Display,
(const nsStyleStruct*&)styleDisplay);
switch (styleDisplay->mOverflow)
{
case NS_STYLE_OVERFLOW_SCROLL:
*aScrollPreference = AlwaysScroll;
break;
case NS_STYLE_OVERFLOW_SCROLLBARS_HORIZONTAL:
*aScrollPreference = AlwaysScrollHorizontal;
break;
case NS_STYLE_OVERFLOW_SCROLLBARS_VERTICAL:
*aScrollPreference = AlwaysScrollVertical;
break;
case NS_STYLE_OVERFLOW_AUTO:
*aScrollPreference = Auto;
break;
default:
*aScrollPreference = NeverScroll;
}
return NS_OK;
}
/**
* Gets the size of the area that lies inside the scrollbars but clips the scrolled frame
*/
NS_IMETHODIMP
nsGfxScrollFrame::GetScrollbarSizes(nsIPresContext* aPresContext,
nscoord *aVbarWidth,
nscoord *aHbarHeight) const
{
nsBoxLayoutState state(aPresContext);
nsSize hs;
mInner->mHScrollbarBox->GetPrefSize(state, hs);
*aHbarHeight = hs.height;
nsSize vs;
mInner->mVScrollbarBox->GetPrefSize(state, vs);
*aVbarWidth = vs.width;
return NS_OK;
}
NS_IMETHODIMP
nsGfxScrollFrame::SetScrollbarVisibility(nsIPresContext* aPresContext,
PRBool aVerticalVisible,
PRBool aHorizontalVisible)
{
mInner->mNeverHasVerticalScrollbar = !aVerticalVisible;
mInner->mNeverHasHorizontalScrollbar = !aHorizontalVisible;
return NS_OK;
}
nsresult NS_CreateAnonymousNode(nsIContent* aParent, nsIAtom* aTag, PRInt32 aNameSpaceId, nsCOMPtr<nsIContent>& aNewNode);
NS_IMETHODIMP
nsGfxScrollFrame::CreateAnonymousContent(nsIPresContext* aPresContext,
nsISupportsArray& aAnonymousChildren)
{
// create horzontal scrollbar
nsresult rv;
NS_WITH_SERVICE(nsIElementFactory, elementFactory,
NS_ELEMENT_FACTORY_PROGID_PREFIX
"http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul",
&rv);
if (!elementFactory)
return NS_ERROR_FAILURE;
nsCOMPtr<nsINodeInfoManager> nodeInfoManager;
mInner->mDocument->GetNodeInfoManager(*getter_AddRefs(nodeInfoManager));
NS_ENSURE_TRUE(nodeInfoManager, NS_ERROR_FAILURE);
nsCOMPtr<nsINodeInfo> nodeInfo;
nodeInfoManager->GetNodeInfo(NS_ConvertASCIItoUCS2("scrollbar"), nsString(), NS_ConvertASCIItoUCS2("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"),
*getter_AddRefs(nodeInfo));
nsCOMPtr<nsIContent> content;
elementFactory->CreateInstanceByTag(nodeInfo, getter_AddRefs(content));
content->SetAttribute(kNameSpaceID_None, nsHTMLAtoms::align,
NS_ConvertToString("horizontal"), PR_FALSE);
content->SetAttribute(kNameSpaceID_None, nsXULAtoms::collapsed,
NS_ConvertToString("true"), PR_FALSE);
aAnonymousChildren.AppendElement(content);
// create vertical scrollbar
content = nsnull;
elementFactory->CreateInstanceByTag(nodeInfo, getter_AddRefs(content));
content->SetAttribute(kNameSpaceID_None, nsHTMLAtoms::align,
NS_ConvertToString("vertical"), PR_FALSE);
content->SetAttribute(kNameSpaceID_None, nsXULAtoms::collapsed,
NS_ConvertToString("true"), PR_FALSE);
aAnonymousChildren.AppendElement(content);
// XXX For GFX never have scrollbars
// mScrollableView->SetScrollPreference(nsScrollPreference_kNeverScroll);
return NS_OK;
}
NS_IMETHODIMP
nsGfxScrollFrame::Destroy(nsIPresContext* aPresContext)
{
return nsBoxFrame::Destroy(aPresContext);
}
NS_IMETHODIMP
nsGfxScrollFrame::Init(nsIPresContext* aPresContext,
nsIContent* aContent,
nsIFrame* aParent,
nsIStyleContext* aStyleContext,
nsIFrame* aPrevInFlow)
{
mPresContext = aPresContext;
nsresult rv = nsBoxFrame::Init(aPresContext, aContent,
aParent, aStyleContext,
aPrevInFlow);
mInner->mDocument->AddObserver(mInner);
return rv;
}
NS_IMETHODIMP
nsGfxScrollFrame::SetInitialChildList(nsIPresContext* aPresContext,
nsIAtom* aListName,
nsIFrame* aChildList)
{
nsresult rv = nsBoxFrame::SetInitialChildList(aPresContext, aListName,
aChildList);
// get scroll area
GetChildBox(&mInner->mScrollAreaBox);
// horizontal scrollbar
mInner->mScrollAreaBox->GetNextBox(&mInner->mHScrollbarBox);
// vertical scrollbar
mInner->mHScrollbarBox->GetNextBox(&mInner->mVScrollbarBox);
// listen for scroll events.
mInner->GetScrollableView(aPresContext)->AddScrollPositionListener(mInner);
return rv;
}
NS_IMETHODIMP
nsGfxScrollFrame::AppendFrames(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aFrameList)
{
nsIFrame* frame;
mInner->mScrollAreaBox->GetFrame(&frame);
return frame->AppendFrames(aPresContext,
aPresShell,
aListName,
aFrameList);
}
NS_IMETHODIMP
nsGfxScrollFrame::InsertFrames(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsIFrame* aFrameList)
{
nsIFrame* frame;
mInner->mScrollAreaBox->GetFrame(&frame);
return frame->InsertFrames(aPresContext,
aPresShell,
aListName,
aPrevFrame,
aFrameList);
}
NS_IMETHODIMP
nsGfxScrollFrame::RemoveFrame(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aOldFrame)
{
nsIFrame* frame;
mInner->mScrollAreaBox->GetFrame(&frame);
return frame->RemoveFrame (aPresContext,
aPresShell,
aListName,
aOldFrame);
}
NS_IMETHODIMP
nsGfxScrollFrame::ReplaceFrame(nsIPresContext* aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aOldFrame,
nsIFrame* aNewFrame)
{
nsIFrame* frame;
mInner->mScrollAreaBox->GetFrame(&frame);
return frame->ReplaceFrame (aPresContext,
aPresShell,
aListName,
aOldFrame,
aNewFrame);
}
NS_IMETHODIMP
nsGfxScrollFrame::GetPadding(nsMargin& aMargin)
{
aMargin.SizeTo(0,0,0,0);
return NS_OK;
}
NS_IMETHODIMP
nsGfxScrollFrame::Paint(nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsFramePaintLayer aWhichLayer)
{
// Paint our children
return nsBoxFrame::Paint(aPresContext, aRenderingContext, aDirtyRect,
aWhichLayer);
}
NS_IMETHODIMP
nsGfxScrollFrame::GetContentAndOffsetsFromPoint(nsIPresContext* aCX,
const nsPoint& aPoint,
nsIContent ** aNewContent,
PRInt32& aContentOffset,
PRInt32& aContentOffsetEnd,
PRBool& aBeginFrameContent)
{
if (! mInner)
return NS_ERROR_NULL_POINTER;
nsIFrame* frame = nsnull;
mInner->mScrollAreaBox->GetFrame(&frame);
return frame->GetContentAndOffsetsFromPoint(aCX, aPoint, aNewContent, aContentOffset, aContentOffsetEnd, aBeginFrameContent);
}
PRIntn
nsGfxScrollFrame::GetSkipSides() const
{
return 0;
}
NS_IMETHODIMP
nsGfxScrollFrame::GetFrameType(nsIAtom** aType) const
{
NS_PRECONDITION(nsnull != aType, "null OUT parameter pointer");
*aType = nsLayoutAtoms::scrollFrame;
NS_ADDREF(*aType);
return NS_OK;
}
NS_IMETHODIMP
nsGfxScrollFrame::GetAscent(nsBoxLayoutState& aState, nscoord& aAscent)
{
aAscent = 0;
nsresult rv = mInner->mScrollAreaBox->GetAscent(aState, aAscent);
nsMargin m(0,0,0,0);
GetBorderAndPadding(m);
aAscent += m.top;
GetMargin(m);
aAscent += m.top;
GetInset(m);
aAscent += m.top;
return rv;
}
NS_IMETHODIMP
nsGfxScrollFrame::GetPrefSize(nsBoxLayoutState& aState, nsSize& aSize)
{
PropagateDebug(aState);
nsIFrame* frame = nsnull;
GetFrame(&frame);
const nsStyleDisplay* styleDisplay = nsnull;
frame->GetStyleData(eStyleStruct_Display,
(const nsStyleStruct*&)styleDisplay);
nsresult rv = mInner->mScrollAreaBox->GetPrefSize(aState, aSize);
nsBox::AddMargin(mInner->mScrollAreaBox, aSize);
if (styleDisplay->mOverflow == NS_STYLE_OVERFLOW_SCROLL ||
styleDisplay->mOverflow == NS_STYLE_OVERFLOW_SCROLLBARS_VERTICAL) {
nsSize vSize(0,0);
mInner->mVScrollbarBox->GetPrefSize(aState, vSize);
nsBox::AddMargin(mInner->mVScrollbarBox, vSize);
aSize.width += vSize.width;
}
if (styleDisplay->mOverflow == NS_STYLE_OVERFLOW_SCROLL ||
styleDisplay->mOverflow == NS_STYLE_OVERFLOW_SCROLLBARS_HORIZONTAL) {
nsSize hSize(0,0);
mInner->mHScrollbarBox->GetPrefSize(aState, hSize);
nsBox::AddMargin(mInner->mHScrollbarBox, hSize);
aSize.height += hSize.height;
}
AddBorderAndPadding(aSize);
AddInset(aSize);
nsIBox::AddCSSPrefSize(aState, this, aSize);
return rv;
}
NS_IMETHODIMP
nsGfxScrollFrame::GetMinSize(nsBoxLayoutState& aState, nsSize& aSize)
{
PropagateDebug(aState);
nsIFrame* frame = nsnull;
GetFrame(&frame);
const nsStyleDisplay* styleDisplay = nsnull;
frame->GetStyleData(eStyleStruct_Display,
(const nsStyleStruct*&)styleDisplay);
nsresult rv = mInner->mScrollAreaBox->GetMinSize(aState, aSize);
if (styleDisplay->mOverflow == NS_STYLE_OVERFLOW_SCROLL ||
styleDisplay->mOverflow == NS_STYLE_OVERFLOW_SCROLLBARS_VERTICAL) {
nsSize vSize(0,0);
mInner->mVScrollbarBox->GetMinSize(aState, vSize);
AddMargin(mInner->mVScrollbarBox, vSize);
aSize.width += vSize.width;
if (aSize.height < vSize.height)
aSize.height = vSize.height;
}
if (styleDisplay->mOverflow == NS_STYLE_OVERFLOW_SCROLL ||
styleDisplay->mOverflow == NS_STYLE_OVERFLOW_SCROLLBARS_HORIZONTAL) {
nsSize hSize(0,0);
mInner->mHScrollbarBox->GetMinSize(aState, hSize);
AddMargin(mInner->mHScrollbarBox, hSize);
aSize.height += hSize.height;
if (aSize.width < hSize.width)
aSize.width = hSize.width;
}
AddBorderAndPadding(aSize);
AddInset(aSize);
nsIBox::AddCSSMinSize(aState, this, aSize);
return rv;
}
NS_IMETHODIMP
nsGfxScrollFrame::GetMaxSize(nsBoxLayoutState& aState, nsSize& aSize)
{
PropagateDebug(aState);
aSize.width = NS_INTRINSICSIZE;
aSize.height = NS_INTRINSICSIZE;
AddBorderAndPadding(aSize);
AddInset(aSize);
nsIBox::AddCSSMaxSize(aState, this, aSize);
return NS_OK;
}
NS_IMETHODIMP
nsGfxScrollFrame::Reflow(nsIPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsGfxScrollFrame", aReflowState.reason);
// if there is a max element request then set it to -1 so we can see if it gets set
if (aDesiredSize.maxElementSize)
{
aDesiredSize.maxElementSize->width = -1;
aDesiredSize.maxElementSize->height = -1;
}
nsresult rv = nsBoxFrame::Reflow(aPresContext, aDesiredSize, aReflowState, aStatus);
// if it was set then cache it. Otherwise set it.
if (aDesiredSize.maxElementSize)
{
nsSize* size = aDesiredSize.maxElementSize;
// if not set then use the cached size. If set then set it.
if (size->width == -1)
size->width = mInner->mMaxElementSize.width;
else
mInner->mMaxElementSize.width = size->width;
if (size->height == -1)
size->height = mInner->mMaxElementSize.height;
else
mInner->mMaxElementSize.height = size->height;
// make sure we add in our scrollbar.
nsBoxLayoutState state(aPresContext, aReflowState, aDesiredSize);
const nsStyleDisplay* styleDisplay = nsnull;
nsIFrame* frame = nsnull;
GetFrame(&frame);
frame->GetStyleData(eStyleStruct_Display,
(const nsStyleStruct*&)styleDisplay);
if (mInner->mHasVerticalScrollbar ||
styleDisplay->mOverflow == NS_STYLE_OVERFLOW_SCROLL ||
styleDisplay->mOverflow == NS_STYLE_OVERFLOW_SCROLLBARS_VERTICAL) {
nsSize vSize(0,0);
mInner->mVScrollbarBox->GetMinSize(state, vSize);
AddMargin(mInner->mVScrollbarBox, vSize);
size->width += vSize.width;
nsMargin border;
GetBorderAndPadding(border);
nsMargin inset;
GetInset(inset);
border += inset;
size->width += border.left + border.right + inset.left + inset.right;
}
}
return rv;
}
NS_IMETHODIMP_(nsrefcnt)
nsGfxScrollFrame::AddRef(void)
{
return NS_OK;
}
NS_IMETHODIMP_(nsrefcnt)
nsGfxScrollFrame::Release(void)
{
return NS_OK;
}
#ifdef NS_DEBUG
NS_IMETHODIMP
nsGfxScrollFrame::GetFrameName(nsString& aResult) const
{
return MakeFrameName("GfxScroll", aResult);
}
#endif
NS_INTERFACE_MAP_BEGIN(nsGfxScrollFrame)
NS_INTERFACE_MAP_ENTRY(nsIAnonymousContentCreator)
#ifdef NS_DEBUG
NS_INTERFACE_MAP_ENTRY(nsIFrameDebug)
#endif
NS_INTERFACE_MAP_ENTRY(nsIScrollableFrame)
NS_INTERFACE_MAP_END_INHERITING(nsBoxFrame)
//-------------------- Inner ----------------------
nsGfxScrollFrameInner::nsGfxScrollFrameInner(nsGfxScrollFrame* aOuter):mHScrollbarBox(nsnull),
mVScrollbarBox(nsnull),
mScrollAreaBox(nsnull),
mOnePixel(20),
mHasVerticalScrollbar(PR_FALSE),
mHasHorizontalScrollbar(PR_FALSE)
{
NS_INIT_REFCNT();
mOuter = aOuter;
mMaxElementSize.width = 0;
mMaxElementSize.height = 0;
mFirstPass = PR_FALSE;
mNeverHasVerticalScrollbar = PR_FALSE;
mNeverHasHorizontalScrollbar = PR_FALSE;
}
NS_IMETHODIMP
nsGfxScrollFrameInner::ScrollPositionWillChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY)
{
// Do nothing.
return NS_OK;
}
/**
* Called if something externally moves the scroll area
* This can happen if the user pages up down or uses arrow keys
* So what we need to do up adjust the scrollbars to match.
*/
NS_IMETHODIMP
nsGfxScrollFrameInner::ScrollPositionDidChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY)
{
SetAttribute(mVScrollbarBox, nsXULAtoms::curpos, aY);
SetAttribute(mHScrollbarBox, nsXULAtoms::curpos, aX);
return NS_OK;
}
NS_IMETHODIMP
nsGfxScrollFrameInner::AttributeChanged(nsIDocument *aDocument,
nsIContent* aContent,
PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aHint)
{
if (mHScrollbarBox && mVScrollbarBox)
{
nsIFrame* hframe = nsnull;
mHScrollbarBox->GetFrame(&hframe);
nsIFrame* vframe = nsnull;
mVScrollbarBox->GetFrame(&vframe);
nsCOMPtr<nsIContent> vcontent;
nsCOMPtr<nsIContent> hcontent;
hframe->GetContent(getter_AddRefs(hcontent));
vframe->GetContent(getter_AddRefs(vcontent));
if (hcontent.get() == aContent || vcontent.get() == aContent)
{
nscoord x = 0;
nscoord y = 0;
nsAutoString value;
if (NS_CONTENT_ATTR_HAS_VALUE == hcontent->GetAttribute(kNameSpaceID_None, nsXULAtoms::curpos, value))
{
PRInt32 error;
// convert it to an integer
x = value.ToInteger(&error);
}
if (NS_CONTENT_ATTR_HAS_VALUE == vcontent->GetAttribute(kNameSpaceID_None, nsXULAtoms::curpos, value))
{
PRInt32 error;
// convert it to an integer
y = value.ToInteger(&error);
}
nsIScrollableView* s = GetScrollableView(mOuter->mPresContext);
s->RemoveScrollPositionListener(this);
ScrollbarChanged(mOuter->mPresContext, x*mOnePixel, y*mOnePixel);
s->AddScrollPositionListener(this);
}
}
return NS_OK;
}
nsIScrollableView*
nsGfxScrollFrameInner::GetScrollableView(nsIPresContext* aPresContext)
{
nsIScrollableView* scrollingView;
nsIView* view;
nsIFrame* frame = nsnull;
mScrollAreaBox->GetFrame(&frame);
frame->GetView(aPresContext, &view);
nsresult result = view->QueryInterface(kScrollViewIID, (void**)&scrollingView);
NS_ASSERTION(NS_SUCCEEDED(result), "assertion gfx scrollframe does not contain a scrollframe");
return scrollingView;
}
void
nsGfxScrollFrameInner::GetScrolledContentSize(nsSize& aSize)
{
// get the ara frame is the scrollarea
nsIBox* child = nsnull;
mScrollAreaBox->GetChildBox(&child);
nsRect rect(0,0,0,0);
child->GetBounds(rect);
aSize.width = rect.width;
aSize.height = rect.height;
nsBox::AddMargin(child, aSize);
nsBox::AddBorderAndPadding(mScrollAreaBox, aSize);
nsBox::AddInset(mScrollAreaBox, aSize);
}
PRBool
nsGfxScrollFrameInner::AddHorizontalScrollbar(nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnTop)
{
return AddRemoveScrollbar(aState, aScrollAreaSize, aOnTop, PR_TRUE, PR_TRUE);
}
PRBool
nsGfxScrollFrameInner::AddVerticalScrollbar(nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnRight)
{
return AddRemoveScrollbar(aState, aScrollAreaSize, aOnRight, PR_FALSE, PR_TRUE);
}
PRBool
nsGfxScrollFrameInner::RemoveHorizontalScrollbar(nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnTop)
{
return AddRemoveScrollbar(aState, aScrollAreaSize, aOnTop, PR_TRUE, PR_FALSE);
}
PRBool
nsGfxScrollFrameInner::RemoveVerticalScrollbar(nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnRight)
{
return AddRemoveScrollbar(aState, aScrollAreaSize, aOnRight, PR_FALSE, PR_FALSE);
}
PRBool
nsGfxScrollFrameInner::AddRemoveScrollbar(nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnTop, PRBool aHorizontal, PRBool aAdd)
{
if (aHorizontal) {
if (mNeverHasHorizontalScrollbar)
return PR_FALSE;
if (aAdd)
SetScrollbarVisibility(mHScrollbarBox, aAdd);
nsSize hSize;
mHScrollbarBox->GetPrefSize(aState, hSize);
nsBox::AddMargin(mHScrollbarBox, hSize);
if (!aAdd)
SetScrollbarVisibility(mHScrollbarBox, aAdd);
PRBool fit = AddRemoveScrollbar(mHasHorizontalScrollbar, aScrollAreaSize.y, aScrollAreaSize.height, hSize.height, aOnTop, aAdd);
if (!fit)
SetScrollbarVisibility(mHScrollbarBox, !aAdd);
return fit;
} else {
if (mNeverHasVerticalScrollbar)
return PR_FALSE;
if (aAdd)
SetScrollbarVisibility(mVScrollbarBox, aAdd);
nsSize vSize;
mVScrollbarBox->GetPrefSize(aState, vSize);
if (!aAdd)
SetScrollbarVisibility(mVScrollbarBox, aAdd);
nsBox::AddMargin(mVScrollbarBox, vSize);
PRBool fit = AddRemoveScrollbar(mHasVerticalScrollbar, aScrollAreaSize.x, aScrollAreaSize.width, vSize.width, aOnTop, aAdd);
if (!fit)
SetScrollbarVisibility(mVScrollbarBox, !aAdd);
return fit;
}
}
PRBool
nsGfxScrollFrameInner::AddRemoveScrollbar(PRBool& aHasScrollbar, nscoord& aXY, nscoord& aSize, nscoord aSbSize, PRBool aRightOrBottom, PRBool aAdd)
{
nscoord size = aSize;
if (size != NS_INTRINSICSIZE) {
if (aAdd) {
size -= aSbSize;
if (!aRightOrBottom && size >= 0)
aXY += aSbSize;
} else {
size += aSbSize;
if (!aRightOrBottom)
aXY -= aSbSize;
}
}
// not enough room? Yes? Return true.
if (size >= aSbSize) {
aHasScrollbar = aAdd;
aSize = size;
return PR_TRUE;
}
return PR_FALSE;
}
nsresult
nsGfxScrollFrameInner::LayoutBox(nsBoxLayoutState& aState, nsIBox* aBox, const nsRect& aRect)
{
return mOuter->LayoutChildAt(aState, aBox, aRect);
}
NS_IMETHODIMP
nsGfxScrollFrame::Layout(nsBoxLayoutState& aState)
{
// mark ourselves as dirty so no child under us
// can post an incremental layout.
mState |= NS_FRAME_HAS_DIRTY_CHILDREN;
PropagateDebug(aState);
PRUint32 flags = 0;
aState.GetLayoutFlags(flags);
nsresult rv = mInner->Layout(aState);
aState.SetLayoutFlags(flags);
nsBox::Layout(aState);
return rv;
}
/**
* Reflow the scroll area if it needs it and return its size. Also determine if the reflow will
* cause any of the scrollbars to need to be reflowed.
*/
nsresult
nsGfxScrollFrameInner::Layout(nsBoxLayoutState& aState)
{
//TODO make bidi code set these from preferences
// if true places the vertical scrollbar on the right false puts it on the left.
PRBool scrollBarRight = PR_TRUE;
// if true places the horizontal scrollbar on the bottom false puts it on the top.
PRBool scrollBarBottom = PR_TRUE;
nsIFrame* frame = nsnull;
mOuter->GetFrame(&frame);
const nsStyleDisplay* styleDisplay = nsnull;
frame->GetStyleData(eStyleStruct_Display,
(const nsStyleStruct*&)styleDisplay);
// get the content rect
nsRect clientRect(0,0,0,0);
mOuter->GetClientRect(clientRect);
// get the preferred size of the scrollbars
nsSize hSize(0,0);
nsSize vSize(0,0);
nsSize hMinSize(0,0);
nsSize vMinSize(0,0);
/*
mHScrollbarBox->GetPrefSize(aState, hSize);
mVScrollbarBox->GetPrefSize(aState, vSize);
mHScrollbarBox->GetMinSize(aState, hMinSize);
mVScrollbarBox->GetMinSize(aState, vMinSize);
nsBox::AddMargin(mHScrollbarBox, hSize);
nsBox::AddMargin(mVScrollbarBox, vSize);
nsBox::AddMargin(mHScrollbarBox, hMinSize);
nsBox::AddMargin(mVScrollbarBox, vMinSize);
*/
// the scroll area size starts off as big as our content area
nsRect scrollAreaRect(clientRect);
// Look at our style do we always have vertical or horizontal scrollbars?
if (styleDisplay->mOverflow == NS_STYLE_OVERFLOW_SCROLL || styleDisplay->mOverflow == NS_STYLE_OVERFLOW_SCROLLBARS_HORIZONTAL)
mHasHorizontalScrollbar = PR_TRUE;
if (styleDisplay->mOverflow == NS_STYLE_OVERFLOW_SCROLL || styleDisplay->mOverflow == NS_STYLE_OVERFLOW_SCROLLBARS_VERTICAL)
mHasVerticalScrollbar = PR_TRUE;
if (mHasHorizontalScrollbar)
AddHorizontalScrollbar(aState, scrollAreaRect, scrollBarBottom);
if (mHasVerticalScrollbar)
AddVerticalScrollbar(aState, scrollAreaRect, scrollBarRight);
// layout our the scroll area
LayoutBox(aState, mScrollAreaBox, scrollAreaRect);
// now look at the content area and see if we need scrollbars or not
PRBool needsLayout = PR_FALSE;
nsSize scrolledContentSize(0,0);
// if we have 'auto' scrollbars look at the vertical case
if (styleDisplay->mOverflow != NS_STYLE_OVERFLOW_SCROLL
&& styleDisplay->mOverflow != NS_STYLE_OVERFLOW_SCROLLBARS_VERTICAL) {
// get the area frame is the scrollarea
GetScrolledContentSize(scrolledContentSize);
// There are two cases to consider
if (scrolledContentSize.height <= scrollAreaRect.height
|| styleDisplay->mOverflow == NS_STYLE_OVERFLOW_SCROLLBARS_HORIZONTAL
|| styleDisplay->mOverflow == NS_STYLE_OVERFLOW_SCROLLBARS_NONE) {
if (mHasVerticalScrollbar) {
// We left room for the vertical scrollbar, but it's not needed;
// remove it.
if (RemoveVerticalScrollbar(aState, scrollAreaRect, scrollBarRight))
needsLayout = PR_TRUE;
}
} else {
if (!mHasVerticalScrollbar) {
// We didn't leave room for the vertical scrollbar, but it turns
// out we needed it
if (AddVerticalScrollbar(aState, scrollAreaRect, scrollBarRight))
needsLayout = PR_TRUE;
}
}
// ok layout at the right size
if (needsLayout) {
nsBoxLayoutState resizeState(aState);
resizeState.SetLayoutReason(nsBoxLayoutState::Resize);
LayoutBox(resizeState, mScrollAreaBox, scrollAreaRect);
needsLayout = PR_FALSE;
}
}
// if scrollbars are auto look at the horizontal case
if ((NS_STYLE_OVERFLOW_SCROLL != styleDisplay->mOverflow)
&& (NS_STYLE_OVERFLOW_SCROLLBARS_HORIZONTAL != styleDisplay->mOverflow))
{
// get the area frame is the scrollarea
GetScrolledContentSize(scrolledContentSize);
// if the child is wider that the scroll area
// and we don't have a scrollbar add one.
if (scrolledContentSize.width > scrollAreaRect.width
&& styleDisplay->mOverflow != NS_STYLE_OVERFLOW_SCROLLBARS_VERTICAL
&& styleDisplay->mOverflow != NS_STYLE_OVERFLOW_SCROLLBARS_NONE) {
if (!mHasHorizontalScrollbar) {
// no scrollbar?
if (AddHorizontalScrollbar(aState, scrollAreaRect, scrollBarBottom))
needsLayout = PR_TRUE;
// if we added a horizonal scrollbar and we did not have a vertical
// there is a chance that by adding the horizonal scrollbar we will
// suddenly need a vertical scrollbar. Is a special case but its
// important.
//if (!mHasVerticalScrollbar && scrolledContentSize.height > scrollAreaRect.height - sbSize.height)
// printf("****Gfx Scrollbar Special case hit!!*****\n");
}
} else {
// if the area is smaller or equal to and we have a scrollbar then
// remove it.
if (mHasHorizontalScrollbar) {
if (RemoveHorizontalScrollbar(aState, scrollAreaRect, scrollBarBottom))
needsLayout = PR_TRUE;
}
}
}
// we only need to set the rect. The inner child stays the same size.
if (needsLayout) {
nsBoxLayoutState resizeState(aState);
resizeState.SetLayoutReason(nsBoxLayoutState::Resize);
LayoutBox(resizeState, mScrollAreaBox, scrollAreaRect);
needsLayout = PR_FALSE;
}
GetScrolledContentSize(scrolledContentSize);
nsIPresContext* presContext = aState.GetPresContext();
float p2t;
presContext->GetScaledPixelsToTwips(&p2t);
mOnePixel = NSIntPixelsToTwips(1, p2t);
const nsStyleFont* font;
mOuter->GetStyleData(eStyleStruct_Font, (const nsStyleStruct*&) font);
const nsFont& f = font->mFont;
nsCOMPtr<nsIFontMetrics> fm;
presContext->GetMetricsFor(f, getter_AddRefs(fm));
nscoord fontHeight = 1;
fm->GetHeight(fontHeight);
nscoord maxX = scrolledContentSize.width - scrollAreaRect.width;
nscoord maxY = scrolledContentSize.height - scrollAreaRect.height;
nsIScrollableView* scrollable = GetScrollableView(presContext);
scrollable->SetLineHeight(fontHeight);
mHScrollbarBox->GetPrefSize(aState, hSize);
mVScrollbarBox->GetPrefSize(aState, vSize);
// layout vertical scrollbar
nsRect vRect(clientRect);
vRect.width = vSize.width;
vRect.y = clientRect.y;
if (mHasHorizontalScrollbar) {
vRect.height -= hSize.height;
if (!scrollBarBottom)
vRect.y += hSize.height;
}
vRect.x = clientRect.x;
if (scrollBarRight)
vRect.x += clientRect.width - vSize.width;
if (mHasVerticalScrollbar) {
SetAttribute(mVScrollbarBox, nsXULAtoms::maxpos, maxY);
SetAttribute(mVScrollbarBox, nsXULAtoms::pageincrement, nscoord(scrollAreaRect.height - fontHeight));
SetAttribute(mVScrollbarBox, nsXULAtoms::increment, fontHeight, PR_FALSE);
}
LayoutBox(aState, mVScrollbarBox, vRect);
mVScrollbarBox->GetPrefSize(aState, vSize);
mVScrollbarBox->GetMinSize(aState, vMinSize);
if (mHasVerticalScrollbar && (vMinSize.width > vRect.width || vMinSize.height > vRect.height)) {
if (RemoveVerticalScrollbar(aState, scrollAreaRect, scrollBarRight))
needsLayout = PR_TRUE;
mVScrollbarBox->GetPrefSize(aState, vSize);
}
// layout horizontal scrollbar
nsRect hRect(clientRect);
hRect.height = hSize.height;
hRect.x = clientRect.x;
if (mHasVerticalScrollbar) {
hRect.width -= vSize.width;
if (!scrollBarRight)
hRect.x += vSize.width;
}
hRect.y = clientRect.y;
if (scrollBarBottom)
hRect.y += clientRect.height - hSize.height;
if (mHasHorizontalScrollbar) {
SetAttribute(mHScrollbarBox, nsXULAtoms::maxpos, maxX);
SetAttribute(mHScrollbarBox, nsXULAtoms::pageincrement, nscoord(float(scrollAreaRect.width)*0.8));
SetAttribute(mHScrollbarBox, nsXULAtoms::increment, 10*mOnePixel, PR_FALSE);
}
LayoutBox(aState, mHScrollbarBox, hRect);
mHScrollbarBox->GetMinSize(aState, hMinSize);
if (mHasHorizontalScrollbar && (hMinSize.width > hRect.width || hMinSize.height > hRect.height)) {
if (RemoveHorizontalScrollbar(aState, scrollAreaRect, scrollBarBottom))
needsLayout = PR_TRUE;
}
// we only need to set the rect. The inner child stays the same size.
if (needsLayout) {
nsBoxLayoutState resizeState(aState);
resizeState.SetLayoutReason(nsBoxLayoutState::Resize);
LayoutBox(resizeState, mScrollAreaBox, scrollAreaRect);
needsLayout = PR_FALSE;
}
return NS_OK;
}
void
nsGfxScrollFrameInner::ScrollbarChanged(nsIPresContext* aPresContext, nscoord aX, nscoord aY)
{
nsIScrollableView* scrollable = GetScrollableView(aPresContext);
scrollable->ScrollTo(aX,aY, NS_SCROLL_PROPERTY_ALWAYS_BLIT);
// printf("scrolling to: %d, %d\n", aX, aY);
}
nsGfxScrollFrameInner::~nsGfxScrollFrameInner()
{
if (mDocument) {
mDocument->RemoveObserver(this);
mDocument = nsnull;
}
}
/**
* Returns whether it actually needed to change the attribute
*/
PRBool
nsGfxScrollFrameInner::SetAttribute(nsIBox* aBox, nsIAtom* aAtom, nscoord aSize, PRBool aReflow)
{
// convert to pixels
aSize /= mOnePixel;
// only set the attribute if it changed.
PRInt32 current = GetIntegerAttribute(aBox, aAtom, -1);
if (current != aSize)
{
nsIFrame* frame = nsnull;
aBox->GetFrame(&frame);
nsCOMPtr<nsIContent> content;
frame->GetContent(getter_AddRefs(content));
char ch[100];
sprintf(ch,"%d", aSize);
nsAutoString newValue; newValue.AssignWithConversion(ch);
content->SetAttribute(kNameSpaceID_None, aAtom, newValue, aReflow);
return PR_TRUE;
}
return PR_FALSE;
}
void
nsGfxScrollFrameInner::SetScrollbarVisibility(nsIBox* aScrollbar, PRBool aVisible)
{
nsIFrame* frame = nsnull;
aScrollbar->GetFrame(&frame);
nsCOMPtr<nsIContent> content;
frame->GetContent(getter_AddRefs(content));
PRBool old = PR_TRUE;
nsAutoString value;
if (NS_CONTENT_ATTR_HAS_VALUE == content->GetAttribute(kNameSpaceID_None, nsXULAtoms::collapsed, value))
old = PR_FALSE;
if (aVisible == old)
return;
if (!aVisible)
content->SetAttribute(kNameSpaceID_None, nsXULAtoms::collapsed, NS_ConvertToString("true"), PR_TRUE);
else
content->UnsetAttribute(kNameSpaceID_None, nsXULAtoms::collapsed, PR_TRUE);
}
PRInt32
nsGfxScrollFrameInner::GetIntegerAttribute(nsIBox* aBox, nsIAtom* atom, PRInt32 defaultValue)
{
nsIFrame* frame = nsnull;
aBox->GetFrame(&frame);
nsCOMPtr<nsIContent> content;
frame->GetContent(getter_AddRefs(content));
nsAutoString value;
if (NS_CONTENT_ATTR_HAS_VALUE == content->GetAttribute(kNameSpaceID_None, atom, value))
{
PRInt32 error;
// convert it to an integer
defaultValue = value.ToInteger(&error);
}
return defaultValue;
}
nsresult
nsGfxScrollFrame::GetContentOf(nsIContent** aContent)
{
GetContent(aContent);
return NS_OK;
}
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