Enum widgetry::mapspace::world::WorldOutcome

pub enum WorldOutcome<ID: ObjectID> {
    ClickedFreeSpace(Pt2D),
    Dragging {
        obj: ID,
        dx: f64,
        dy: f64,
        cursor: Pt2D,
    },
    Keypress(&'static str, ID),
    ClickedObject(ID),
    HoverChanged(Option<ID>, Option<ID>),
    Nothing,
}

The result of a World handling an event

Variants

ClickedFreeSpace(Pt2D)

A left click occurred while not hovering on any object

Dragging

An object is being dragged. The given offsets are relative to the previous dragging event. The current position of the cursor is included. If you’re dragging a large object, applying the offset will likely feel more natural than centering on the cursor.

Fields

obj: ID

dx: f64

dy: f64

cursor: Pt2D

Keypress(&'static str, ID)

While hovering on an object with a defined hotkey, that key was pressed.

ClickedObject(ID)

A hoverable object was clicked

HoverChanged(Option<ID>, Option<ID>)

The object being hovered on changed from (something before, to something after). Note this transition may also occur outside of event – such as during delete or initialize_hover.

TODO Bug in the map_editor: If you delete one object, then the caller does initialize_hover and we immediately wind up on another road beneath, we don’t detect this and start showing road points.

Nothing

Nothing interesting happened

Implementations

impl<I: ObjectID> WorldOutcome<I>

pub fn maybe_map_id<O: ObjectID, F: Fn(I) -> Option<O>>( self, f: F ) -> Option<WorldOutcome<O>>

If the outcome references some ID, transform it to another type. This is useful when some component owns a World that contains a few different types of objects, some of which are managed by another component that only cares about its IDs.

Trait Implementations

impl<ID: Clone + ObjectID> Clone for WorldOutcome<ID>

fn clone(&self) -> WorldOutcome<ID>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.