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package bogue
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Dealing with events.
Events are simply SDL events, plus a few additional events. They are also used for primitive communication between threads.
Events are detected by Layouts, and then sent to the resident Widget. Finally, the Widget decides what to do with the events. There is one exception: the startup event is directly sent to all Widgets.
Dependency graph
type t = Tsdl.Sdl.event_typeSDL events
val text_input : tSame as Tsdl.Sdl.Event.text_input
val key_down : tSame as Tsdl.Sdl.Event.key_down
val key_up : tSame as Tsdl.Sdl.Event.key_up
Special Bogue events
val startup : tThe startup event is sent to all Widgets when the Bogue mainloop is started using Main.run.
val mouse_enter : tThe mouse_enter event is triggered when the pointer (mouse motion, or finger touch -- but not finger drag) enters a new layout.
val mouse_leave : tSimilar to mouse_enter, when the pointer leaves the layout.
val mouse_at_rest : tTriggered when the mouse did not move for a while.
val var_changed : tThe var_changed event can be sent to notify that some widget made a change to a global variable.
val update : tCurrently the update event is more or less equivalent to var_changed. This might change in future versions.
val user_event : tSame as Tsdl.Sdl.Event.user_event. This special event of type SDL_UserEvent can trigger a global reaction, not associated with any widget in particular, through the on_user_event parameter of Main.create
val buttons_down : t listA list of events containing the mouse_button_down event, and the finger_down event.
val buttons_up : t listA list of events containing the mouse_button_up event, and the finger_up event.
val pointer_motion : t listA list of events containing the mouse_motion event, and the finger_motion event.
Using events for terminating threads
val should_exit : Tsdl.Sdl.event -> boolTell if the current thread should exit. This should only be called within a widget action. The event should be the event passed to the action function. A well programmed action should check this event to decide if it should exit.
val will_exit : Tsdl.Sdl.event -> unitA nice thread should do this just before terminating. May be suppressed in future versions.
val nice_delay : Tsdl.Sdl.event -> float -> unitnice_delay ev t Wait during a delay (t seconds), but quit anyway when should_exit ev is true.
Send the SDL_QUIT event, as if the user clicked on the close button of the last existing window. It will in principle raise the Main.Exit exception and hence exit the mainloop.
val wait_for : ?timeout:float -> ?ev:Tsdl.Sdl.event -> (unit -> bool) -> unitSDL Misc
SDL events
type sdl_event = Tsdl.Sdl.Event.enumtype bogue_event = [ | `Bogue_startup| `Bogue_stop| `Bogue_stopped| `Bogue_mouse_at_rest| `Bogue_mouse_enter| `Bogue_mouse_leave| `Bogue_var_changed| `Bogue_keyboard_focus| `Bogue_mouse_focus| `Bogue_remove_layout| `Bogue_destroy_window| `Bogue_update| `Bogue_sync_action| `Bogue_redraw| `Bogue_keymap_changed
]val event_kind : Tsdl.Sdl.event -> [ sdl_event | bogue_event ]Union of sdl_event and bogue_event