diff options
Diffstat (limited to 'riscos/mouse.c')
| -rw-r--r-- | riscos/mouse.c | 78 |
1 files changed, 75 insertions, 3 deletions
diff --git a/riscos/mouse.c b/riscos/mouse.c index 12b4e3e54..73535cae5 100644 --- a/riscos/mouse.c +++ b/riscos/mouse.c @@ -27,6 +27,12 @@ * - on Null Polls while the drag is active, * - when the drag terminates with Event_DragEnd, and * - when the drag terminates with Escape being pressed. + * + * 2. Mouse tracking support, allowing clients to track the mouse while it + * remains in the current window and specify callbacks to be used + * + * - on Null Polls while the pointer is in the window, and + * - when the pointer leaves the window. */ #include "oslib/wimp.h" @@ -44,6 +50,15 @@ static void (*ro_mouse_drag_track_callback)(wimp_pointer *pointer, void *data) static void (*ro_mouse_drag_cancel_callback)(void *data) = NULL; static void *ro_mouse_drag_data = NULL; +/* Data for the wimp poll handler. */ + +static void (*ro_mouse_poll_end_callback)(wimp_leaving *leaving, void *data) + = NULL; +static void (*ro_mouse_poll_track_callback)(wimp_pointer *pointer, void *data) + = NULL; +static void *ro_mouse_poll_data = NULL; + + /** * Process Null polls for any drags and mouse trackers that are currently * active. @@ -56,7 +71,8 @@ void ro_mouse_poll(void) /* If no trackers are active, just exit. */ - if (ro_mouse_drag_track_callback == NULL /* && no trackers */) + if (ro_mouse_drag_track_callback == NULL && + ro_mouse_poll_track_callback == NULL) return; error = xwimp_get_pointer_info(&pointer); @@ -71,6 +87,11 @@ void ro_mouse_poll(void) if (ro_mouse_drag_track_callback != NULL) ro_mouse_drag_track_callback(&pointer, ro_mouse_drag_data); + + /* Process the window tracker, if one is active. */ + + if (ro_mouse_poll_track_callback != NULL) + ro_mouse_poll_track_callback(&pointer, ro_mouse_poll_data); } @@ -106,8 +127,8 @@ void ro_mouse_drag_start(void (*drag_end)(wimp_dragged *dragged, void *data), /** - * Process Wimp_DragEnd events by passing the details on to any registered - * event handler. + * Process Wimp_DragEnd events by terminating an active drag track and passing + * the details on to any registered event handler. * * \param *dragged The Wimp_DragEnd data block. */ @@ -129,3 +150,54 @@ void ro_mouse_drag_end(wimp_dragged *dragged) ro_mouse_drag_data = NULL; } + +/** + * 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 + * in the window, or NULL for none. + * \param *data Data to be passed to the callback functions, or NULL. + */ + +void ro_mouse_track_start(void (*poll_end)(wimp_leaving *leaving, void *data), + void (*poll_track)(wimp_pointer *pointer, void *data), + void *data) +{ + /* It should never be possible for the mouse to be in two windows + * at the same time! + */ + + assert(ro_mouse_poll_end_callback == NULL && + ro_mouse_poll_track_callback == NULL && + ro_mouse_poll_data == NULL); + + ro_mouse_poll_end_callback = poll_end; + ro_mouse_poll_track_callback = poll_track; + ro_mouse_poll_data = data; +} + + +/** + * Process Wimp_PointerLeaving events by terminating an active mouse track and + * passing the details on to any registered event handler. + * + * \param *leaving The Wimp_PointerLeaving data block. + */ + +void ro_mouse_pointer_leaving_window(wimp_leaving *leaving) +{ + if (ro_mouse_poll_end_callback != NULL) + ro_mouse_poll_end_callback(leaving, ro_mouse_poll_data); + + /* Poll tracking is a one-shot event, so clear the data ready for + * another claimant. + */ + + ro_mouse_poll_end_callback = NULL; + ro_mouse_poll_track_callback = NULL; + ro_mouse_poll_data = NULL; +} + |