Class: MouseWheelZoom

ol.interaction.MouseWheelZoom


import MouseWheelZoom from 'ol/interaction/mousewheelzoom';

Allows the user to zoom the map by scrolling the mouse wheel.

new ol.interaction.MouseWheelZoom(opt_options)

src/ol/interaction/mousewheelzoom.js, line 21
Name Type Description
options

Options.

Name Type Description
duration number | undefined

Animation duration in milliseconds. Default is 250.

timeout number | undefined

Mouse wheel timeout duration in milliseconds. Default is 80.

constrainResolution boolean | undefined

When using a trackpad or magic mouse, zoom to the closest integer zoom level after the scroll gesture ends. Default is false.

useAnchor boolean | undefined

Enable zooming using the mouse's location as the anchor. Default is true. When set to false, zooming in and out will zoom to the center of the screen instead of zooming on the mouse's location.

Fires:

Extends

Observable Properties

Name Type Settable ol.Object.Event type Description
active boolean yes change:active

true if the interaction is active, false otherwise.

Methods

ol.interaction.MouseWheelZoom.handleEvent(mapBrowserEvent){boolean}

src/ol/interaction/mousewheelzoom.js, line 121

Handles the map browser event (if it was a mousewheel-event) and eventually zooms the map.

This:
Name Type Description
mapBrowserEvent ol.MapBrowserEvent

Map browser event.

Returns:
Allow event propagation.

changed() inherited

src/ol/observable.js, line 58

Increases the revision counter and dispatches a 'change' event.

dispatchEvent(event) inherited

src/ol/observable.js, line 75

Dispatches an event and calls all listeners listening for events of this type. The event parameter can either be a string or an Object with a type property.

Name Type Description
event Object | ol.events.Event | string

Event object.

get(key){*} inherited

src/ol/object.js, line 101

Gets a value.

Name Type Description
key string

Key name.

Returns:
Value.

getActive(){boolean} inherited

src/ol/interaction/interaction.js, line 55

Return whether the interaction is currently active.

Returns:
true if the interaction is active, false otherwise.

getKeys(){Array.<string>} inherited

src/ol/object.js, line 115

Get a list of object property names.

Returns:
List of property names.

getMap(){ol.PluggableMap} inherited

src/ol/interaction/interaction.js, line 66

Get the map associated with this interaction.

Returns:
Map.

getProperties(){Object.<string, *>} inherited

src/ol/object.js, line 125

Get an object of all property names and values.

Returns:
Object.

getRevision(){number} inherited

src/ol/observable.js, line 84

Get the version number for this object. Each time the object is modified, its version number will be incremented.

Returns:
Revision.

on(type, listener, opt_this){ol.EventsKey|Array.<ol.EventsKey>} inherited

src/ol/observable.js, line 99

Listen for a certain type of event.

Name Type Description
type string | Array.<string>

The event type or array of event types.

listener function

The listener function.

this Object

The object to use as this in listener.

Returns:
Unique key for the listener. If called with an array of event types as the first argument, the return will be an array of keys.

once(type, listener, opt_this){ol.EventsKey|Array.<ol.EventsKey>} inherited

src/ol/observable.js, line 124

Listen once for a certain type of event.

Name Type Description
type string | Array.<string>

The event type or array of event types.

listener function

The listener function.

this Object

The object to use as this in listener.

Returns:
Unique key for the listener. If called with an array of event types as the first argument, the return will be an array of keys.

set(key, value, opt_silent) inherited

src/ol/object.js, line 150

Sets a value.

Name Type Description
key string

Key name.

value *

Value.

silent boolean

Update without triggering an event.

setActive(active) inherited

src/ol/interaction/interaction.js, line 77

Activate or deactivate the interaction.

Name Type Description
active boolean

Active.

setMouseAnchor(useAnchor)

src/ol/interaction/mousewheelzoom.js, line 272

Enable or disable using the mouse's location as an anchor when zooming

Name Type Description
useAnchor boolean

true to zoom to the mouse's location, false to zoom to the center of the map

setProperties(values, opt_silent) inherited

src/ol/object.js, line 170

Sets a collection of key-value pairs. Note that this changes any existing properties and adds new ones (it does not remove any existing properties).

Name Type Description
values Object.<string, *>

Values.

silent boolean

Update without triggering an event.

un(type, listener, opt_this) inherited

src/ol/observable.js, line 147

Unlisten for a certain type of event.

Name Type Description
type string | Array.<string>

The event type or array of event types.

listener function

The listener function.

this Object

The object which was used as this by the listener.

unset(key, opt_silent) inherited

src/ol/object.js, line 184

Unsets a property.

Name Type Description
key string

Key name.

silent boolean

Unset without triggering an event.