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Code Issues Releases Wiki Activity

TrackPanel::mpClickedTrack is a safe weak_ptr

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This commit is contained in:
Paul Licameli 2017-06-27 14:35:30 -04:00
parent 6684c7b9b0
commit e424f8e54e
2 changed files with 14 additions and 17 deletions
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29
src/TrackPanel.cpp
View File

@ -765,16 +765,11 @@ void TrackPanel::CancelDragging()
{
if (mUIHandle) {
UIHandle::Result refreshResult = mUIHandle->Cancel(GetProject());
{
// TODO: avoid dangling pointers to mpClickedTrack
// when the undo stack management of the typical Cancel override
// causes it to relocate. That is implement some means to
// re-fetch the track according to its position in the list.
// (Or should all Tracks be managed always by std::shared_ptr?)
mpClickedTrack = NULL;
}
ProcessUIHandleResult(this, mRuler, mpClickedTrack, NULL, refreshResult);
mpClickedTrack = NULL;
auto pTrack = GetTracks()->Lock(mpClickedTrack);
if (pTrack)
ProcessUIHandleResult(
this, mRuler, pTrack.get(), NULL, refreshResult);
mpClickedTrack.reset();
mUIHandle = NULL;
Uncapture();
}
@ -1458,16 +1453,17 @@ try
}
if (mUIHandle) {
auto pClickedTrack = GetTracks()->Lock(mpClickedTrack);
if (event.Dragging()) {
// UIHANDLE DRAG
const UIHandle::Result refreshResult =
mUIHandle->Drag( tpmEvent, GetProject() );
ProcessUIHandleResult
(this, mRuler, mpClickedTrack, pTrack.get(), refreshResult);
(this, mRuler, pClickedTrack.get(), pTrack.get(), refreshResult);
if (refreshResult & RefreshCode::Cancelled) {
// Drag decided to abort itself
mUIHandle = NULL;
mpClickedTrack = NULL;
mpClickedTrack.reset();
Uncapture( &event );
}
else
@ -1483,8 +1479,8 @@ try
UIHandle::Result refreshResult =
uiHandle->Release( tpmEvent, GetProject(), this );
ProcessUIHandleResult
(this, mRuler, mpClickedTrack, pTrack.get(), refreshResult);
mpClickedTrack = NULL;
(this, mRuler, pClickedTrack.get(), pTrack.get(), refreshResult);
mpClickedTrack.reset();
// will also Uncapture() below
}
}
@ -1544,7 +1540,7 @@ void TrackPanel::HandleClick( const TrackPanelMouseEvent &tpmEvent )
if (refreshResult & RefreshCode::Cancelled)
mUIHandle = NULL;
else
mpClickedTrack = pTrack.get();
mpClickedTrack = pTrack;
ProcessUIHandleResult
(this, mRuler, pTrack.get(), pTrack.get(), refreshResult);
HandleCursor( tpmEvent );
@ -2181,7 +2177,8 @@ void TrackPanel::DrawOutside(Track * t, wxDC * dc, const wxRect & rec)
// when TrackPanelCell gets a virtual function into which we move this
// drawing code.
MouseCaptureEnum(TrackControls::gCaptureState);
const bool captured = (t == mpClickedTrack);
auto pClickedTrack = GetTracks()->Lock(mpClickedTrack);
const bool captured = (t == pClickedTrack.get());
TrackInfo::DrawItems( dc, rect, *t, mouseCapture, captured );

2
src/TrackPanel.h
View File

@ -527,7 +527,7 @@ protected:
wxSize vrulerSize;
protected:
Track *mpClickedTrack {};
std::weak_ptr<Track> mpClickedTrack;
// TrackPanel is not responsible for memory management:
UIHandle *mUIHandle {};