Module event

The event enums and assorted supporting types.

These are sent to the closure given to EventLoop::run_app(...), where they get processed and used to modify the program state. For more details, see the root-level documentation.

Some of these events represent different “parts” of a traditional event-handling loop. You could approximate the basic ordering loop of EventLoop::run_app(...) like this:

let mut start_cause = StartCause::Init;

while !elwt.exiting() {
    app.new_events(event_loop, start_cause);

    for event in (window events, user events, device events) {
        // This will pick the right method on the application based on the event.
        app.handle_event(event_loop, event);
    }

    for window_id in (redraw windows) {
        app.window_event(event_loop, window_id, RedrawRequested);
    }

    app.about_to_wait(event_loop);
    start_cause = wait_if_necessary();
}

app.exiting(event_loop);

This leaves out timing details like ControlFlow::WaitUntil but hopefully describes what happens in what order.

Structs

• DeviceId
  Identifier of an input device.
• FingerId
  Identifier of a finger in a touch event.
• KeyEvent
  Describes a keyboard input targeting a window.
• Modifiers
  Describes keyboard modifiers event.
• RawKeyEvent
  Describes a keyboard input as a raw device event.
• SurfaceSizeWriter
  Handle to synchronously change the size of the window from the WindowEvent.
• Touch
  Represents a touch event

Enums

• DeviceEvent
  Represents raw hardware events that are not associated with any particular window.
• ElementState
  Describes the input state of a key.
• Event
  Describes a generic event.
• Force
  Describes the force of a touch event
• Ime
  Describes input method events.
• MouseButton
  Describes a button of a mouse controller.
• MouseScrollDelta
  Describes a difference in the mouse scroll wheel state.
• StartCause
  Describes the reason the event loop is resuming.
• TouchPhase
  Describes touch-screen input state.
• WindowEvent
  Describes an event from a [Window].

Type Aliases

• AxisId
  Identifier for a specific analog axis on some device.
• ButtonId
  Identifier for a specific button on some device.