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51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
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//---
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// JustUI.jevent: GUI union event
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//---
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#ifndef _J_EVENT
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#define _J_EVENT
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#include <justui/defs.h>
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#include <justui/jwidget.h>
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#include <gint/keyboard.h>
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/* jevent: GUI event
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This type is mostly a union type that provides details on every event that
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occurs in the GUI. These are mostly widget signaling state changes,
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validations, and other GUI specifics that might require attention. Events
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can either be reported to the user by the scene (upwards event) or notify
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widgets of something occuring to them (downwards event).
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JustUI tries hard to not invert flow control and leave the user to decide
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when to produce downwards events. In a normal situation, events from
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getkey() are passed to the scene using jscene_process_key() while reading
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GUI events moving upwards with jscene_pollevent(). This way, the user can
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decide to filter their key events or even craft some.
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For the sake of convenience, a single function jscene_run() is provided that
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implements a common form of main loop, which forwards keyboard events to the
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scene and reports upwards GUI events and ignored key events.
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Event IDs can be registered with j_register_event() and (usually) exposed as
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global variables. Extensions are meaningful for custom widget types that
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need their own upwards events. */
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typedef struct {
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/* Widget that emitted the event (if upwards), NULL otherwise */
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void *source;
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/* Type of event */
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uint16_t type;
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/* Reserved for future use */
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uint16_t _;
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/* Event details or data */
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union {
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/* Downward JWIDGET_KEY event or upwards JSCENE_KEY */
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key_event_t key;
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};
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} jevent;
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#endif /* _J_EVENT */
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