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Allow mouse tracking events to terminate without a PointerLeaving event being received.

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This change should handle the situation where a PointerEntering event is received without a corresponding PointerLeaving event, which appears to be caused by some third-party OS addons. This could cause unexpected consequences, so all such terminations are currently logged.
This commit is contained in:
Steve Fryatt 2014-04-05 19:59:07 +01:00
parent f0f05d691b
commit 99c47eb99b
2 changed files with 33 additions and 10 deletions
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35
riscos/mouse.c
View File

@ -163,9 +163,11 @@ void ro_mouse_drag_end(wimp_dragged *dragged)
* Start tracking the mouse in a window, providing a function to be called on
* null polls and optionally one to be called when it leaves the window.
*
* \param *drag_end Callback for when the pointer leaves the window, or
* NULL for none.
* \param *drag_track Callback for mouse tracking while the pointer remains
* \param *poll_end Callback for when the pointer leaves the window, or
* NULL for none. Claimants can receive *leaving==NULL if
* a new tracker is started before a PointerLeaving event
* is received.
* \param *poll_track Callback for mouse tracking while the pointer remains
* in the window, or NULL for none.
* \param *data Data to be passed to the callback functions, or NULL.
*/
@ -175,12 +177,31 @@ void ro_mouse_track_start(void (*poll_end)(wimp_leaving *leaving, void *data),
void *data)
{
/* It should never be possible for the mouse to be in two windows
* at the same time!
* at the same time! However, some third-party extensions to RISC OS
* appear to make this possible (MouseAxess being one), so in the
* event that there's still a claimant we tidy them up first and then
* log the fact in case there are any unexpected consequences.
*
* NB: The Poll End callback will get called with *leaving == NULL in
* this situation, as there's no PointerLeaving event to pass on.
*/
assert(ro_mouse_poll_end_callback == NULL &&
ro_mouse_poll_track_callback == NULL &&
ro_mouse_poll_data == NULL);
if (ro_mouse_poll_end_callback != NULL ||
ro_mouse_poll_track_callback != NULL ||
ro_mouse_poll_data != NULL) {
if (ro_mouse_poll_end_callback != NULL &&
ro_mouse_ignore_leaving_event == false)
ro_mouse_poll_end_callback(NULL, ro_mouse_poll_data);
LOG(("Unexpected mouse track termination."));
ro_mouse_ignore_leaving_event = false;
ro_mouse_poll_end_callback = NULL;
ro_mouse_poll_track_callback = NULL;
ro_mouse_poll_data = NULL;
}
/* Now record details of the new claimant. */
ro_mouse_poll_end_callback = poll_end;
ro_mouse_poll_track_callback = poll_track;

8
riscos/mouse.h
View File

@ -65,9 +65,11 @@ void ro_mouse_drag_end(wimp_dragged *dragged);
* Start tracking the mouse in a window, providing a function to be called on
* null polls and optionally one to be called when it leaves the window.
*
* \param *drag_end Callback for when the pointer leaves the window, or
* NULL for none.
* \param *drag_track Callback for mouse tracking while the pointer remains
* \param *poll_end Callback for when the pointer leaves the window, or
* NULL for none. Claimants can receive *leaving==NULL if
* a new tracker is started before a PointerLeaving event
* is received.
* \param *poll_track Callback for mouse tracking while the pointer remains
* in the window, or NULL for none.
* \param *data Data to be passed to the callback functions, or NULL.
*/