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Allow safely disabling touch events from a touch event handler

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Don't delete the window wxWindowGesturesData when calling
EnableTouchEvents(wxTOUCH_NONE) but just free it, to make it safe to
call EnableTouchEvents() even from a touch event handler, which later
returns to wxGTK code that could still use the gestures data object.
This commit is contained in:
Vadim Zeitlin
2017-11-23 13:33:36 +01:00
parent 5f5c5b8f29
commit 25da7a58ef
1 changed files with 43 additions and 22 deletions
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65
src/gtk/window.cpp
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@@ -244,8 +244,21 @@ namespace
class wxWindowGesturesData
{
public:
wxWindowGesturesData(wxWindow* win, GtkWidget *widget, int eventsMask);
~wxWindowGesturesData();
// This class has rather unusual "resurrectable" semantics: it is
// initialized by the ctor as usual, but may then be uninitialized by
// calling Free() and re-initialized again by calling Reinit().
wxWindowGesturesData(wxWindow* win, GtkWidget *widget, int eventsMask)
{
Reinit(win, widget, eventsMask);
}
~wxWindowGesturesData()
{
Free();
}
void Reinit(wxWindow* win, GtkWidget *widget, int eventsMask);
void Free();
unsigned int m_touchCount;
unsigned int m_lastTouchTime;
@@ -3370,9 +3383,9 @@ touch_callback(GtkWidget* WXUNUSED(widget), GdkEventTouch* gdk_event, wxWindowGT
}
}
wxWindowGesturesData::wxWindowGesturesData(wxWindowGTK* win,
GtkWidget *widget,
int eventsMask)
void wxWindowGesturesData::Reinit(wxWindowGTK* win,
GtkWidget *widget,
int eventsMask)
{
m_touchCount = 0;
m_lastTouchTime = 0;
@@ -3500,18 +3513,13 @@ wxWindowGesturesData::wxWindowGesturesData(wxWindowGTK* win,
G_CALLBACK(touch_callback), win);
}
wxWindowGesturesData::~wxWindowGesturesData()
void wxWindowGesturesData::Free()
{
if ( m_vertical_pan_gesture )
g_object_unref(m_vertical_pan_gesture);
if ( m_horizontal_pan_gesture )
g_object_unref(m_horizontal_pan_gesture);
if ( m_zoom_gesture )
g_object_unref(m_zoom_gesture);
if ( m_rotate_gesture )
g_object_unref(m_rotate_gesture);
if ( m_long_press_gesture )
g_object_unref(m_long_press_gesture);
g_clear_object(&m_vertical_pan_gesture);
g_clear_object(&m_horizontal_pan_gesture);
g_clear_object(&m_zoom_gesture);
g_clear_object(&m_rotate_gesture);
g_clear_object(&m_long_press_gesture);
}
#endif // wxGTK_HAS_GESTURES_SUPPORT
@@ -3526,17 +3534,30 @@ bool wxWindowGTK::EnableTouchEvents(int eventsMask)
// Check if gestures support is also available during run-time.
if ( gtk_check_version(3, 14, 0) == NULL )
{
wxWindowGesturesData* const dataOld = wxWindowGestures::FromObject(this);
if ( eventsMask == wxTOUCH_NONE )
{
wxWindowGestures::EraseForObject(this);
// Reset the gestures data used by this object, but don't destroy
// it, as we could be called from an event handler, in which case
// this object could be still used after the event handler returns.
if ( dataOld )
dataOld->Free();
}
else
{
wxWindowGestures::StoreForObject
(
this,
new wxWindowGesturesData(this, GetConnectWidget(), eventsMask)
);
GtkWidget* const widget = GetConnectWidget();
if ( dataOld )
{
dataOld->Reinit(this, widget, eventsMask);
}
else
{
wxWindowGesturesData* const
dataNew = new wxWindowGesturesData(this, widget, eventsMask);
wxWindowGestures::StoreForObject(this, dataNew);
}
}
return true;