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Avoid a crash in nsAutoScrollTimer by keeping a reference to the content instead of the view. bug 322084, patch by jpl24 <jlurz24@gmail.com>, r+sr=roc

This commit is contained in:
mrbkap%gmail.com 2006-06-16 01:54:31 +00:00
Родитель 5472b873cc
Коммит 75ca976432
4 изменённых файлов: 128 добавлений и 61 удалений
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8
layout/generic/nsFrame.cpp
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@ -2077,6 +2077,14 @@ static nsIView* GetNearestCapturingView(nsIFrame* aFrame) {
return view;
}
nsIFrame* nsFrame::GetNearestCapturingFrame(nsIFrame* aFrame) {
nsIFrame* captureFrame = aFrame;
while (captureFrame && !captureFrame->GetMouseCapturer()) {
captureFrame = captureFrame->GetParent();
}
return captureFrame;
}
NS_IMETHODIMP nsFrame::HandleDrag(nsPresContext* aPresContext,
nsGUIEvent* aEvent,
nsEventStatus* aEventStatus)

9
layout/generic/nsFrame.h
Просмотреть файл

@ -209,6 +209,15 @@ public:
PRInt32 aLineStart,
PRInt8 aOutSideLimit
);
/**
* Find the nearest frame with a mouse capturer. If no
* parent has mouse capture this will return null.
* @param aFrame Frame drag began in.
* @return Nearest capturing frame.
*/
static nsIFrame* GetNearestCapturingFrame(nsIFrame* aFrame);
NS_IMETHOD CharacterDataChanged(nsPresContext* aPresContext,
nsIContent* aChild,
PRBool aAppend);

1
layout/generic/nsFrameSelection.h
Просмотреть файл

@ -208,7 +208,6 @@ public:
/** StartAutoScrollTimer is responsible for scrolling views so that aPoint is always
* visible, and for selecting any frame that contains aPoint. The timer will also reset
* itself to fire again if we have not scrolled to the end of the document.
* @param aPresContext is the context to use when figuring out what frame contains the point.
* @param aView is view to use when searching for the closest frame to the point,
* which is the view that is capturing the mouse
* @param aPoint is relative to the view.

171
layout/generic/nsSelection.cpp
Просмотреть файл

@ -97,7 +97,7 @@ static NS_DEFINE_CID(kFrameTraversalCID, NS_FRAMETRAVERSAL_CID);
#include "nsIDeviceContext.h"
#include "nsITimer.h"
#include "nsIServiceManager.h"
#include "nsFrameManager.h"
// notifications
#include "nsIDOMDocument.h"
#include "nsIDocument.h"
@ -242,10 +242,22 @@ public:
SelectionDetails **aReturnDetails, SelectionType aType, PRBool aSlowCheck);
NS_IMETHOD Repaint(nsPresContext* aPresContext);
nsresult StartAutoScrollTimer(nsPresContext *aPresContext, nsIView *aView, nsPoint& aPoint, PRUint32 aDelay);
nsresult StartAutoScrollTimer(nsPresContext *aPresContext,
nsIView *aView,
nsPoint& aPoint,
PRUint32 aDelay);
nsresult StopAutoScrollTimer();
nsresult DoAutoScrollView(nsPresContext *aPresContext, nsIView *aView, nsPoint& aPoint, PRBool aScrollParentViews);
private:
friend class nsAutoScrollTimer;
nsresult DoAutoScrollView(nsPresContext *aPresContext,
nsIView *aView,
nsPoint& aPoint,
PRBool aScrollParentViews);
nsresult ScrollPointIntoClipView(nsPresContext *aPresContext, nsIView *aView, nsPoint& aPoint, PRBool *aDidScroll);
nsresult ScrollPointIntoView(nsPresContext *aPresContext, nsIView *aView, nsPoint& aPoint, PRBool aScrollParentViews, PRBool *aDidScroll);
nsresult GetViewAncestorOffset(nsIView *aView, nsIView *aAncestorView, nscoord *aXOffset, nscoord *aYOffset);
@ -299,7 +311,7 @@ private:
nsFrameSelection *mFrameSelection;
nsWeakPtr mPresShellWeak; //weak reference to presshell.
SelectionType mType;//type of this nsTypedSelection;
nsAutoScrollTimer *mAutoScrollTimer; // timer for autoscrolling.
nsRefPtr<nsAutoScrollTimer> mAutoScrollTimer; // timer for autoscrolling.
nsCOMArray<nsISelectionListener> mSelectionListeners;
PRPackedBool mTrueDirection;
nsRevocableEventPtr<ScrollSelectionIntoViewEvent> mScrollEvent;
@ -358,7 +370,7 @@ public:
NS_DECL_ISUPPORTS
nsAutoScrollTimer()
: mSelection(0), mView(0), mPresContext(0), mPoint(0,0), mDelay(30)
: mFrameSelection(0), mSelection(0), mPresContext(0), mPoint(0,0), mDelay(30)
{
}
@ -370,9 +382,42 @@ public:
nsresult Start(nsPresContext *aPresContext, nsIView *aView, nsPoint &aPoint)
{
mView = aView;
mPoint = aPoint;
// Store the presentation context. The timer will be
// stopped by the selection if the prescontext is destroyed.
mPresContext = aPresContext;
mPoint = aPoint;
// Store the content from the nearest capturing frame. If this returns null
// the capturing frame is the root.
nsIFrame* clientFrame = NS_STATIC_CAST(nsIFrame*, aView->GetClientData());
NS_ASSERTION(clientFrame, "Missing client frame");
nsIFrame* capturingFrame = nsFrame::GetNearestCapturingFrame(clientFrame);
NS_ASSERTION(!capturingFrame || capturingFrame->GetMouseCapturer(),
"Capturing frame should have a mouse capturer" );
NS_ASSERTION(!capturingFrame || mPresContext == capturingFrame->GetPresContext(),
"Shouldn't have different pres contexts");
NS_ASSERTION(capturingFrame != mPresContext->PresShell()->FrameManager()->GetRootFrame(),
"Capturing frame should not be the root frame");
if (capturingFrame)
{
mContent = capturingFrame->GetContent();
NS_ASSERTION(mContent, "Need content");
NS_ASSERTION(mContent != mPresContext->PresShell()->FrameManager()->GetRootFrame()->GetContent(),
"We didn't want the root content!");
NS_ASSERTION(capturingFrame == nsFrame::GetNearestCapturingFrame(
mPresContext->PresShell()->GetPrimaryFrameFor(mContent)),
"Mapping of frame to content failed.");
}
// Check that if there was no capturing frame the content is null.
NS_ASSERTION(capturingFrame || !mContent, "Content not cleared correctly.");
if (!mTimer)
{
@ -388,15 +433,14 @@ public:
nsresult Stop()
{
nsresult result = NS_OK;
if (mTimer)
{
mTimer->Cancel();
mTimer = 0;
}
return result;
mContent = nsnull;
return NS_OK;
}
nsresult Init(nsFrameSelection *aFrameSelection, nsTypedSelection *aSelection)
@ -414,50 +458,64 @@ public:
NS_IMETHOD Notify(nsITimer *timer)
{
if (mSelection && mPresContext && mView)
if (mSelection && mPresContext)
{
nsIFrame *frame = NS_STATIC_CAST(nsIFrame*, mView->GetClientData());
// If the content is null the capturing frame must be the root frame.
nsIFrame* capturingFrame;
if (mContent)
{
nsIFrame* contentFrame = mPresContext->PresShell()->GetPrimaryFrameFor(mContent);
if (contentFrame)
{
capturingFrame = nsFrame::GetNearestCapturingFrame(contentFrame);
}
else
{
capturingFrame = nsnull;
}
NS_ASSERTION(!capturingFrame || capturingFrame->GetMouseCapturer(),
"Capturing frame should have a mouse capturer" );
}
else
{
capturingFrame = mPresContext->PresShell()->FrameManager()->GetRootFrame();
}
if (!frame)
// Clear the content reference now that the frame has been found.
mContent = nsnull;
// This could happen for a frame with style changed to display:none or a frame
// that was destroyed.
if (!capturingFrame) {
NS_WARNING("Frame destroyed or set to display:none before scroll timer fired.");
return NS_OK;
}
mFrameSelection->HandleDrag(frame, mPoint);
nsIView* captureView = capturingFrame->GetMouseCapturer();
nsIFrame* viewFrame = NS_STATIC_CAST(nsIFrame*, captureView->GetClientData());
NS_ASSERTION(viewFrame, "View must have a client frame");
mFrameSelection->HandleDrag(viewFrame, mPoint);
mSelection->DoAutoScrollView(mPresContext, mView, mPoint, PR_TRUE);
mSelection->DoAutoScrollView(mPresContext, captureView, mPoint, PR_TRUE);
}
return NS_OK;
}
private:
nsFrameSelection *mFrameSelection;
nsFrameSelection *mFrameSelection;
nsTypedSelection *mSelection;
nsCOMPtr<nsITimer> mTimer;
nsIView *mView;
nsPresContext *mPresContext;
nsPoint mPoint;
PRUint32 mDelay;
nsPoint mPoint;
nsCOMPtr<nsITimer> mTimer;
nsCOMPtr<nsIContent> mContent;
PRUint32 mDelay;
};
NS_IMPL_ADDREF(nsAutoScrollTimer)
NS_IMPL_RELEASE(nsAutoScrollTimer)
NS_IMPL_QUERY_INTERFACE1(nsAutoScrollTimer, nsITimerCallback)
nsresult NS_NewAutoScrollTimer(nsAutoScrollTimer **aResult);
nsresult NS_NewAutoScrollTimer(nsAutoScrollTimer **aResult)
{
if (!aResult)
return NS_ERROR_NULL_POINTER;
*aResult = (nsAutoScrollTimer*) new nsAutoScrollTimer;
if (!aResult)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(*aResult);
return NS_OK;
}
nsresult NS_NewSelection(nsFrameSelection **aFrameSelection);
nsresult NS_NewSelection(nsFrameSelection **aFrameSelection)
@ -3891,7 +3949,6 @@ nsTypedSelection::nsTypedSelection(nsFrameSelection *aList)
mFrameSelection = aList;
mFixupState = PR_FALSE;
mDirection = eDirNext;
mAutoScrollTimer = nsnull;
mCachedOffsetForFrame = nsnull;
}
@ -3901,7 +3958,6 @@ nsTypedSelection::nsTypedSelection()
mFrameSelection = nsnull;
mFixupState = PR_FALSE;
mDirection = eDirNext;
mAutoScrollTimer = nsnull;
mCachedOffsetForFrame = nsnull;
}
@ -3917,7 +3973,7 @@ void nsTypedSelection::DetachFromPresentation() {
if (mAutoScrollTimer) {
mAutoScrollTimer->Stop();
NS_RELEASE(mAutoScrollTimer);
mAutoScrollTimer = nsnull;
}
mScrollEvent.Revoke();
@ -4712,18 +4768,20 @@ nsTypedSelection::GetFrameSelection(nsFrameSelection **aFrameSelection) {
}
nsresult
nsTypedSelection::StartAutoScrollTimer(nsPresContext *aPresContext, nsIView *aView, nsPoint& aPoint, PRUint32 aDelay)
nsTypedSelection::StartAutoScrollTimer(nsPresContext *aPresContext,
nsIView *aView,
nsPoint& aPoint,
PRUint32 aDelay)
{
NS_PRECONDITION(aView, "Need a view");
nsresult result;
if (!mFrameSelection)
return NS_OK;//nothing to do
if (!mAutoScrollTimer)
{
result = NS_NewAutoScrollTimer(&mAutoScrollTimer);
if (NS_FAILED(result))
return result;
mAutoScrollTimer = new nsAutoScrollTimer();
if (!mAutoScrollTimer)
return NS_ERROR_OUT_OF_MEMORY;
@ -5007,7 +5065,10 @@ nsTypedSelection::ScrollPointIntoView(nsPresContext *aPresContext, nsIView *aVie
}
nsresult
nsTypedSelection::DoAutoScrollView(nsPresContext *aPresContext, nsIView *aView, nsPoint& aPoint, PRBool aScrollParentViews)
nsTypedSelection::DoAutoScrollView(nsPresContext *aPresContext,
nsIView *aView,
nsPoint& aPoint,
PRBool aScrollParentViews)
{
if (!aPresContext || !aView)
return NS_ERROR_NULL_POINTER;
@ -5022,19 +5083,14 @@ nsTypedSelection::DoAutoScrollView(nsPresContext *aPresContext, nsIView *aView,
//
nsPoint globalOffset;
result = GetViewAncestorOffset(aView, nsnull, &globalOffset.x, &globalOffset.y);
if (NS_FAILED(result))
return result;
NS_ENSURE_SUCCESS(result, result);
//
// Convert aPoint into global coordinates so we can get back
// to the same point after all the parent views have scrolled.
//
nsPoint globalPoint = aPoint + globalOffset;
//
// Now scroll aPoint into view.
//
@ -5042,9 +5098,7 @@ nsTypedSelection::DoAutoScrollView(nsPresContext *aPresContext, nsIView *aView,
PRBool didScroll = PR_FALSE;
result = ScrollPointIntoView(aPresContext, aView, aPoint, aScrollParentViews, &didScroll);
if (NS_FAILED(result))
return result;
NS_ENSURE_SUCCESS(result, result);
//
// Start the AutoScroll timer if necessary.
@ -5058,13 +5112,10 @@ nsTypedSelection::DoAutoScrollView(nsPresContext *aPresContext, nsIView *aView,
// window and its parents may have changed their offsets.
//
result = GetViewAncestorOffset(aView, nsnull, &globalOffset.x, &globalOffset.y);
if (NS_FAILED(result))
return result;
NS_ENSURE_SUCCESS(result, result);
nsPoint svPoint = globalPoint - globalOffset;
result = mAutoScrollTimer->Start(aPresContext, aView, svPoint);
mAutoScrollTimer->Start(aPresContext, aView, svPoint);
}
return NS_OK;