Struct druid::DruidHandler

pub struct DruidHandler<T> { /* fields omitted */ }

The struct implements the druid-shell WinHandler trait.

One DruidHandler exists per window.

This is something of an internal detail and possibly we don't want to surface it publicly.

Trait Implementations

impl<T: Data> WinHandler for DruidHandler<T>

fn connect(&mut self, handle: &WindowHandle)

Provide the handler with a handle to the window so that it can invalidate or make other requests.

fn paint(&mut self, piet: &mut Piet) -> bool

Request the handler to paint the window contents. Return value indicates whether window is animating, i.e. whether another paint should be scheduled for the next animation frame.

fn size(&mut self, width: u32, height: u32)

Called when the size of the window is changed. Note that size is in physical pixels.

fn command(&mut self, id: u32)

Called when a menu item is selected.

fn mouse_down(&mut self, event: &MouseEvent)

Called on mouse button down.

fn mouse_up(&mut self, event: &MouseEvent)

Called on mouse button up.

fn mouse_move(&mut self, event: &MouseEvent)

Called when the mouse moves.

fn key_down(&mut self, event: KeyEvent) -> bool

Called on a key down event.

fn key_up(&mut self, event: KeyEvent)

Called when a key is released. This corresponds to the WM_KEYUP message on Windows, or keyUp(withEvent:) on macOS.

fn wheel(&mut self, delta: Vec2, mods: KeyModifiers)

Called on a mouse wheel event.

fn zoom(&mut self, delta: f64)

Called when a platform-defined zoom gesture occurs (such as pinching on the trackpad).

fn got_focus(&mut self)

Called when this window becomes the focused window.

fn timer(&mut self, token: TimerToken)

Called on timer event.

fn idle(&mut self, token: IdleToken)

Called when a idle token is requested by [IdleHandle::schedule_idle()] call.

fn as_any(&mut self) -> &mut dyn Any

Get a reference to the handler state. Used mostly by idle handlers.

fn destroy(&mut self)

Called when the window is being destroyed. Note that this happens earlier in the sequence than drop (at WM_DESTROY, while the latter is WM_NCDESTROY).

fn rebuild_resources(&mut self)

Called when the resources need to be rebuilt.