# Listen To Events

{% hint style="info" %}
To cause a widget inside `FlutterMap`'s context to rebuild when the [`MapCamera`](https://docs.fleaflet.dev/v6/usage/programmatic-control/get-camera), [`MapOptions`](https://docs.fleaflet.dev/v6/usage/options), or [`MapController`](https://docs.fleaflet.dev/v6/usage/programmatic-control/controller) changes, see [#hooking-into-inherited-state](https://docs.fleaflet.dev/v6/plugins/making-a-plugin/creating-new-layers#hooking-into-inherited-state "mention").

This page's methods should only be used to listen to events from outside the `FlutterMap`'s context.
{% endhint %}

When changes happen to `FlutterMap`'s internal state (such as a change to the current [`MapCamera`](https://docs.fleaflet.dev/v6/usage/programmatic-control/get-camera)) it emits a `MapEvent`, which can be handled by you.

## Catching All Events

There's two methods to catch all emitted `MapEvent`s. These methods expose the raw `MapEvent`, and is recommended in cases where multiple events need to be caught, or there's no more specific callback method available in `MapOptions` (see [#catching-specific-events](#catching-specific-events "mention")).

* Listening to a [`MapController`](https://docs.fleaflet.dev/v6/usage/programmatic-control/controller)'s `mapEventStream`, which exposes events via a `Stream`
* Specifying a callback method in `MapOptions.onMapEvent`

## Catching Specific Events

If only a couple of events need to be caught, such as just an `onTap` handler, it is possible to avoid handling the raw `Stream` of `MapEvent`s. Instead, `MapOptions` has callbacks available for the following events:

* `onTap`
* `onLongPress`
* `onPositionChanged`
* `onPointerDown`/`onPointerUp`/`onPointerHover`/`onPointerCancel`
* `onMapReady`\
  Primarily used for advanced `MapController` [#usage-inside-initstate](https://docs.fleaflet.dev/v6/usage/controller#usage-inside-initstate "mention")

{% hint style="info" %}
The `MapEventTap` event may be emitted (or the `onTap` callback called) 250ms after the actual tap occurred, as this is the acceptable delay between the two taps in a double tap zoom gesture.

If this causes noticeable jank or a bad experience (for example, on desktop platforms), disable [`InteractiveFlag`](https://docs.fleaflet.dev/v6/options/interaction-options#flags)`.doubleTapZoom`:

```dart
options: MapOptions(
    interactiveFlags: ~InteractiveFlag.doubleTapZoom,
),
```

This disables the double tap handler, so the `MapEventTap` is emitted 'instantly' on tap.
{% endhint %}