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gecko/layout/generic/nsGfxScrollFrame.h

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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 Communicator client 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 ***** */
/* rendering object to wrap rendering objects that should be scrollable */
#ifndef nsGfxScrollFrame_h___
#define nsGfxScrollFrame_h___
#include "nsHTMLContainerFrame.h"
#include "nsIAnonymousContentCreator.h"
#include "nsBoxFrame.h"
#include "nsIScrollableFrame.h"
#include "nsIScrollPositionListener.h"
#include "nsIStatefulFrame.h"
#include "nsGUIEvent.h"
#include "nsThreadUtils.h"
#include "nsIScrollableView.h"
#include "nsIView.h"
#include "nsIReflowCallback.h"
#include "nsBoxLayoutState.h"
class nsPresContext;
class nsIPresShell;
class nsIContent;
class nsIAtom;
class nsIDocument;
class nsIScrollFrameInternal;
class nsPresState;
struct ScrollReflowState;
class nsGfxScrollFrameInner : public nsIScrollPositionListener,
public nsIReflowCallback {
public:
NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr);
NS_IMETHOD_(nsrefcnt) AddRef(void);
NS_IMETHOD_(nsrefcnt) Release(void);
nsGfxScrollFrameInner(nsContainerFrame* aOuter, PRBool aIsRoot,
PRBool aIsXUL);
~nsGfxScrollFrameInner();
typedef nsIScrollableFrame::ScrollbarStyles ScrollbarStyles;
ScrollbarStyles GetScrollbarStylesFromFrame() const;
// If a child frame was added or removed on the scrollframe,
// reload our child frame list.
// We need this if a scrollbar frame is recreated.
void ReloadChildFrames();
PRBool NeedsClipWidget() const;
void CreateScrollableView();
nsresult CreateAnonymousContent(nsTArray<nsIContent*>& aElements);
nsresult FireScrollPortEvent();
void PostOverflowEvent();
void Destroy();
nsresult BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists);
// nsIReflowCallback
virtual PRBool ReflowFinished();
virtual void ReflowCallbackCanceled();
// nsIScrollPositionListener
NS_IMETHOD ScrollPositionWillChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY);
virtual void ViewPositionDidChange(nsIScrollableView* aScrollable);
NS_IMETHOD ScrollPositionDidChange(nsIScrollableView* aScrollable, nscoord aX, nscoord aY);
// This gets called when the 'curpos' attribute on one of the scrollbars changes
void CurPosAttributeChanged(nsIContent* aChild);
void PostScrollEvent();
void FireScrollEvent();
class ScrollEvent : public nsRunnable {
public:
NS_DECL_NSIRUNNABLE
ScrollEvent(nsGfxScrollFrameInner *inner) : mInner(inner) {}
void Revoke() { mInner = nsnull; }
private:
nsGfxScrollFrameInner *mInner;
};
class AsyncScrollPortEvent : public nsRunnable {
public:
NS_DECL_NSIRUNNABLE
AsyncScrollPortEvent(nsGfxScrollFrameInner *inner) : mInner(inner) {}
void Revoke() { mInner = nsnull; }
private:
nsGfxScrollFrameInner *mInner;
};
static void FinishReflowForScrollbar(nsIContent* aContent, nscoord aMinXY,
nscoord aMaxXY, nscoord aCurPosXY,
nscoord aPageIncrement,
nscoord aIncrement);
static void SetScrollbarEnabled(nsIContent* aContent, nscoord aMaxPos);
static void SetCoordAttribute(nsIContent* aContent, nsIAtom* aAtom,
nscoord aSize);
nscoord GetCoordAttribute(nsIBox* aFrame, nsIAtom* atom, nscoord defaultValue);
// Like ScrollPositionDidChange, but initiated by this frame rather than from the
// scrolling view
void InternalScrollPositionDidChange(nscoord aX, nscoord aY);
nsIScrollableView* GetScrollableView() const { return mScrollableView; }
nsIView* GetParentViewForChildFrame(nsIFrame* aFrame) const;
void ScrollToRestoredPosition();
nsPresState* SaveState(nsIStatefulFrame::SpecialStateID aStateID);
void RestoreState(nsPresState* aState);
void SaveVScrollbarStateToGlobalHistory();
nsresult GetVScrollbarHintFromGlobalHistory(PRBool* aVScrollbarNeeded);
nsIFrame* GetScrolledFrame() const { return mScrolledFrame; }
void ScrollbarChanged(nsPresContext* aPresContext, nscoord aX, nscoord aY, PRUint32 aFlags);
static void SetScrollbarVisibility(nsIBox* aScrollbar, PRBool aVisible);
/**
* GetScrolledRect is designed to encapsulate deciding which
* directions of overflow should be reachable by scrolling and which
* should not. Callers should NOT depend on it having any particular
* behavior (although nsXULScrollFrame currently does).
*
* Currently it allows scrolling down and to the right for
* nsHTMLScrollFrames with LTR directionality and for all
* nsXULScrollFrames, and allows scrolling down and to the left for
* nsHTMLScrollFrames with RTL directionality.
*/
nsRect GetScrolledRect(const nsSize& aScrollPortSize) const;
nsSize GetScrollPortSize() const
{
return mScrollableView->View()->GetBounds().Size();
}
nsMargin GetActualScrollbarSizes() const;
nsMargin GetDesiredScrollbarSizes(nsBoxLayoutState* aState);
PRBool IsLTR() const;
PRBool IsScrollbarOnRight() const;
void LayoutScrollbars(nsBoxLayoutState& aState,
const nsRect& aContentArea,
const nsRect& aOldScrollArea,
const nsRect& aScrollArea);
// owning references to the nsIAnonymousContentCreator-built content
nsCOMPtr<nsIContent> mHScrollbarContent;
nsCOMPtr<nsIContent> mVScrollbarContent;
nsCOMPtr<nsIContent> mScrollCornerContent;
nsRevocableEventPtr<ScrollEvent> mScrollEvent;
nsRevocableEventPtr<AsyncScrollPortEvent> mAsyncScrollPortEvent;
nsIScrollableView* mScrollableView;
nsIBox* mHScrollbarBox;
nsIBox* mVScrollbarBox;
nsIFrame* mScrolledFrame;
nsIBox* mScrollCornerBox;
nsContainerFrame* mOuter;
nsRect mRestoreRect;
nsPoint mLastPos;
PRPackedBool mNeverHasVerticalScrollbar:1;
PRPackedBool mNeverHasHorizontalScrollbar:1;
PRPackedBool mHasVerticalScrollbar:1;
PRPackedBool mHasHorizontalScrollbar:1;
PRPackedBool mViewInitiatedScroll:1;
PRPackedBool mFrameInitiatedScroll:1;
PRPackedBool mDidHistoryRestore:1;
// Is this the scrollframe for the document's viewport?
PRPackedBool mIsRoot:1;
// Is mOuter an nsXULScrollFrame?
PRPackedBool mIsXUL:1;
// If true, don't try to layout the scrollbars in Reflow(). This can be
// useful if multiple passes are involved, because we don't want to place the
// scrollbars at the wrong size.
PRPackedBool mSupppressScrollbarUpdate:1;
// If true, we skipped a scrollbar layout due to mSupppressScrollbarUpdate
// being set at some point. That means we should lay out scrollbars even if
// it might not strictly be needed next time mSupppressScrollbarUpdate is
// false.
PRPackedBool mSkippedScrollbarLayout:1;
// Did we load a hint from global history
// about whether a vertical scrollbar is required?
PRPackedBool mDidLoadHistoryVScrollbarHint:1;
// The value of the hint loaded
PRPackedBool mHistoryVScrollbarHint:1;
PRPackedBool mHadNonInitialReflow:1;
// State used only by PostScrollEvents so we know
// which overflow states have changed.
PRPackedBool mHorizontalOverflow:1;
PRPackedBool mVerticalOverflow:1;
PRPackedBool mPostedReflowCallback:1;
PRPackedBool mMayHaveDirtyFixedChildren:1;
};
/**
* The scroll frame creates and manages the scrolling view
*
* It only supports having a single child frame that typically is an area
* frame, but doesn't have to be. The child frame must have a view, though
*
* Scroll frames don't support incremental changes, i.e. you can't replace
* or remove the scrolled frame
*/
class nsHTMLScrollFrame : public nsHTMLContainerFrame,
public nsIScrollableFrame,
public nsIAnonymousContentCreator,
public nsIStatefulFrame {
public:
friend nsIFrame* NS_NewHTMLScrollFrame(nsIPresShell* aPresShell, nsStyleContext* aContext, PRBool aIsRoot);
NS_DECL_ISUPPORTS
// Called to set the child frames. We typically have three: the scroll area,
// the vertical scrollbar, and the horizontal scrollbar.
NS_IMETHOD SetInitialChildList(nsIAtom* aListName,
nsIFrame* aChildList);
NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists) {
return mInner.BuildDisplayList(aBuilder, aDirtyRect, aLists);
}
PRBool TryLayout(ScrollReflowState* aState,
nsHTMLReflowMetrics* aKidMetrics,
PRBool aAssumeVScroll, PRBool aAssumeHScroll,
PRBool aForce, nsresult* aResult);
PRBool ScrolledContentDependsOnHeight(ScrollReflowState* aState);
nsresult ReflowScrolledFrame(ScrollReflowState* aState,
PRBool aAssumeHScroll,
PRBool aAssumeVScroll,
nsHTMLReflowMetrics* aMetrics,
PRBool aFirstPass);
nsresult ReflowContents(ScrollReflowState* aState,
const nsHTMLReflowMetrics& aDesiredSize);
void PlaceScrollArea(const ScrollReflowState& aState);
nscoord GetIntrinsicVScrollbarWidth(nsIRenderingContext *aRenderingContext);
virtual nscoord GetMinWidth(nsIRenderingContext *aRenderingContext);
virtual nscoord GetPrefWidth(nsIRenderingContext *aRenderingContext);
NS_IMETHOD GetPadding(nsMargin& aPadding);
virtual PRBool IsCollapsed(nsBoxLayoutState& aBoxLayoutState);
NS_IMETHOD Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
// Because there can be only one child frame, these two function return
// NS_ERROR_FAILURE
NS_IMETHOD AppendFrames(nsIAtom* aListName,
nsIFrame* aFrameList);
NS_IMETHOD InsertFrames(nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsIFrame* aFrameList);
virtual void Destroy();
NS_IMETHOD RemoveFrame(nsIAtom* aListName,
nsIFrame* aOldFrame);
virtual nsIView* GetParentViewForChildFrame(nsIFrame* aFrame) const {
return mInner.GetParentViewForChildFrame(aFrame);
}
virtual nsIFrame* GetContentInsertionFrame() {
return mInner.GetScrolledFrame()->GetContentInsertionFrame();
}
virtual nsIView* GetMouseCapturer() const {
return mInner.GetScrolledFrame()->GetView();
}
virtual void InvalidateInternal(const nsRect& aDamageRect,
nscoord aX, nscoord aY, nsIFrame* aForChild,
PRUint32 aFlags);
virtual PRBool NeedsView() { return PR_TRUE; }
virtual PRBool DoesClipChildren() { return PR_TRUE; }
virtual nsSplittableType GetSplittableType() const;
virtual nsPoint GetPositionOfChildIgnoringScrolling(nsIFrame* aChild)
{ nsPoint pt = aChild->GetPosition();
if (aChild == mInner.GetScrolledFrame()) pt += GetScrollPosition();
return pt;
}
// nsIAnonymousContentCreator
virtual nsresult CreateAnonymousContent(nsTArray<nsIContent*>& aElements);
// nsIScrollableFrame
virtual nsIFrame* GetScrolledFrame() const;
virtual nsIScrollableView* GetScrollableView();
virtual nsPoint GetScrollPosition() const;
virtual void ScrollTo(nsPoint aScrollPosition, PRUint32 aFlags);
virtual void SetScrollbarVisibility(PRBool aVerticalVisible, PRBool aHorizontalVisible);
virtual nsIBox* GetScrollbarBox(PRBool aVertical);
virtual void CurPosAttributeChanged(nsIContent* aChild, PRInt32 aModType);
// nsIStatefulFrame
NS_IMETHOD SaveState(SpecialStateID aStateID, nsPresState** aState) {
NS_ENSURE_ARG_POINTER(aState);
*aState = mInner.SaveState(aStateID);
return NS_OK;
}
NS_IMETHOD RestoreState(nsPresState* aState) {
NS_ENSURE_ARG_POINTER(aState);
mInner.RestoreState(aState);
return NS_OK;
}
virtual void ScrollToRestoredPosition() {
mInner.ScrollToRestoredPosition();
}
virtual nsMargin GetActualScrollbarSizes() const {
return mInner.GetActualScrollbarSizes();
}
virtual nsMargin GetDesiredScrollbarSizes(nsBoxLayoutState* aState);
virtual nsMargin GetDesiredScrollbarSizes(nsPresContext* aPresContext,
nsIRenderingContext* aRC) {
nsBoxLayoutState bls(aPresContext, aRC, 0);
return GetDesiredScrollbarSizes(&bls);
}
virtual nsGfxScrollFrameInner::ScrollbarStyles GetScrollbarStyles() const;
/**
* Get the "type" of the frame
*
* @see nsGkAtoms::scrollFrame
*/
virtual nsIAtom* GetType() const;
#ifdef NS_DEBUG
NS_IMETHOD GetFrameName(nsAString& aResult) const;
#endif
PRBool DidHistoryRestore() { return mInner.mDidHistoryRestore; }
#ifdef ACCESSIBILITY
NS_IMETHOD GetAccessible(nsIAccessible** aAccessible);
#endif
protected:
nsHTMLScrollFrame(nsIPresShell* aShell, nsStyleContext* aContext, PRBool aIsRoot);
virtual PRIntn GetSkipSides() const;
void SetSuppressScrollbarUpdate(PRBool aSuppress) {
mInner.mSupppressScrollbarUpdate = aSuppress;
}
PRBool GuessHScrollbarNeeded(const ScrollReflowState& aState);
PRBool GuessVScrollbarNeeded(const ScrollReflowState& aState);
nsSize GetScrollPortSize() const
{
return mInner.GetScrollPortSize();
}
PRBool IsScrollbarUpdateSuppressed() const {
return mInner.mSupppressScrollbarUpdate;
}
// Return whether we're in an "initial" reflow. Some reflows with
// NS_FRAME_FIRST_REFLOW set are NOT "initial" as far as we're concerned.
PRBool InInitialReflow() const;
/**
* Override this to return false if computed height/min-height/max-height
* should NOT be propagated to child content.
* nsListControlFrame uses this.
*/
virtual PRBool ShouldPropagateComputedHeightToScrolledContent() const { return PR_TRUE; }
private:
friend class nsGfxScrollFrameInner;
nsGfxScrollFrameInner mInner;
};
/**
* The scroll frame creates and manages the scrolling view
*
* It only supports having a single child frame that typically is an area
* frame, but doesn't have to be. The child frame must have a view, though
*
* Scroll frames don't support incremental changes, i.e. you can't replace
* or remove the scrolled frame
*/
class nsXULScrollFrame : public nsBoxFrame,
public nsIScrollableFrame,
public nsIAnonymousContentCreator,
public nsIStatefulFrame {
public:
friend nsIFrame* NS_NewXULScrollFrame(nsIPresShell* aPresShell, nsStyleContext* aContext, PRBool aIsRoot);
// Called to set the child frames. We typically have three: the scroll area,
// the vertical scrollbar, and the horizontal scrollbar.
NS_IMETHOD SetInitialChildList(nsIAtom* aListName,
nsIFrame* aChildList);
NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists) {
return mInner.BuildDisplayList(aBuilder, aDirtyRect, aLists);
}
// XXXldb Is this actually used?
#if 0
virtual nscoord GetMinWidth(nsIRenderingContext *aRenderingContext);
#endif
// Because there can be only one child frame, these two function return
// NS_ERROR_FAILURE
NS_IMETHOD AppendFrames(nsIAtom* aListName,
nsIFrame* aFrameList);
NS_IMETHOD InsertFrames(nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsIFrame* aFrameList);
virtual void Destroy();
NS_IMETHOD RemoveFrame(nsIAtom* aListName,
nsIFrame* aOldFrame);
virtual nsIView* GetParentViewForChildFrame(nsIFrame* aFrame) const {
return mInner.GetParentViewForChildFrame(aFrame);
}
virtual nsIFrame* GetContentInsertionFrame() {
return mInner.GetScrolledFrame()->GetContentInsertionFrame();
}
virtual nsIView* GetMouseCapturer() const {
return mInner.GetScrolledFrame()->GetView();
}
virtual void InvalidateInternal(const nsRect& aDamageRect,
nscoord aX, nscoord aY, nsIFrame* aForChild,
PRUint32 aFlags);
virtual PRBool NeedsView() { return PR_TRUE; }
virtual PRBool DoesClipChildren() { return PR_TRUE; }
virtual nsSplittableType GetSplittableType() const;
virtual nsPoint GetPositionOfChildIgnoringScrolling(nsIFrame* aChild)
{ nsPoint pt = aChild->GetPosition();
if (aChild == mInner.GetScrolledFrame()) pt += GetScrollPosition();
return pt;
}
// nsIAnonymousContentCreator
virtual nsresult CreateAnonymousContent(nsTArray<nsIContent*>& aElements);
// nsIBox methods
NS_DECL_ISUPPORTS
virtual nsSize GetMinSize(nsBoxLayoutState& aBoxLayoutState);
virtual nsSize GetPrefSize(nsBoxLayoutState& aBoxLayoutState);
virtual nsSize GetMaxSize(nsBoxLayoutState& aBoxLayoutState);
virtual nscoord GetBoxAscent(nsBoxLayoutState& aBoxLayoutState);
NS_IMETHOD DoLayout(nsBoxLayoutState& aBoxLayoutState);
NS_IMETHOD GetPadding(nsMargin& aPadding);
nsresult Layout(nsBoxLayoutState& aState);
void LayoutScrollArea(nsBoxLayoutState& aState, const nsRect& aRect);
static 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);
void RemoveHorizontalScrollbar(nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnBottom);
void RemoveVerticalScrollbar (nsBoxLayoutState& aState, nsRect& aScrollAreaSize, PRBool aOnRight);
static void AdjustReflowStateForPrintPreview(nsBoxLayoutState& aState, PRBool& aSetBack);
static void AdjustReflowStateBack(nsBoxLayoutState& aState, PRBool aSetBack);
// nsIScrollableFrame
virtual nsIFrame* GetScrolledFrame() const;
virtual nsIScrollableView* GetScrollableView();
virtual nsPoint GetScrollPosition() const;
virtual void ScrollTo(nsPoint aScrollPosition, PRUint32 aFlags);
virtual void SetScrollbarVisibility(PRBool aVerticalVisible, PRBool aHorizontalVisible);
virtual nsIBox* GetScrollbarBox(PRBool aVertical);
virtual void CurPosAttributeChanged(nsIContent* aChild, PRInt32 aModType);
// nsIStatefulFrame
NS_IMETHOD SaveState(SpecialStateID aStateID, nsPresState** aState) {
NS_ENSURE_ARG_POINTER(aState);
*aState = mInner.SaveState(aStateID);
return NS_OK;
}
NS_IMETHOD RestoreState(nsPresState* aState) {
NS_ENSURE_ARG_POINTER(aState);
mInner.RestoreState(aState);
return NS_OK;
}
virtual void ScrollToRestoredPosition() {
mInner.ScrollToRestoredPosition();
}
virtual nsMargin GetActualScrollbarSizes() const {
return mInner.GetActualScrollbarSizes();
}
virtual nsMargin GetDesiredScrollbarSizes(nsBoxLayoutState* aState);
virtual nsMargin GetDesiredScrollbarSizes(nsPresContext* aPresContext,
nsIRenderingContext* aRC) {
nsBoxLayoutState bls(aPresContext, aRC, 0);
return GetDesiredScrollbarSizes(&bls);
}
virtual nsGfxScrollFrameInner::ScrollbarStyles GetScrollbarStyles() const;
/**
* Get the "type" of the frame
*
* @see nsGkAtoms::scrollFrame
*/
virtual nsIAtom* GetType() const;
virtual PRBool IsFrameOfType(PRUint32 aFlags) const
{
// Override bogus IsFrameOfType in nsBoxFrame.
if (aFlags & (nsIFrame::eReplacedContainsBlock | nsIFrame::eReplaced))
return PR_FALSE;
return nsBoxFrame::IsFrameOfType(aFlags);
}
#ifdef NS_DEBUG
NS_IMETHOD GetFrameName(nsAString& aResult) const;
#endif
protected:
nsXULScrollFrame(nsIPresShell* aShell, nsStyleContext* aContext, PRBool aIsRoot);
virtual PRIntn GetSkipSides() const;
private:
friend class nsGfxScrollFrameInner;
nsGfxScrollFrameInner mInner;
};
#endif /* nsGfxScrollFrame_h___ */
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