86 lines
2.6 KiB
JavaScript
86 lines
2.6 KiB
JavaScript
/**
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* @module ol/interaction/KeyboardZoom
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*/
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import {inherits} from '../index.js';
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import EventType from '../events/EventType.js';
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import {targetNotEditable} from '../events/condition.js';
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import Interaction from '../interaction/Interaction.js';
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/**
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* @classdesc
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* Allows the user to zoom the map using keyboard + and -.
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* Note that, although this interaction is by default included in maps,
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* the keys can only be used when browser focus is on the element to which
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* the keyboard events are attached. By default, this is the map div,
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* though you can change this with the `keyboardEventTarget` in
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* {@link ol.Map}. `document` never loses focus but, for any other element,
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* focus will have to be on, and returned to, this element if the keys are to
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* function.
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* See also {@link ol.interaction.KeyboardPan}.
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*
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* @constructor
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* @param {olx.interaction.KeyboardZoomOptions=} opt_options Options.
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* @extends {ol.interaction.Interaction}
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* @api
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*/
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const KeyboardZoom = function(opt_options) {
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Interaction.call(this, {
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handleEvent: KeyboardZoom.handleEvent
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});
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const options = opt_options ? opt_options : {};
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/**
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* @private
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* @type {ol.EventsConditionType}
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*/
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this.condition_ = options.condition ? options.condition : targetNotEditable;
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/**
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* @private
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* @type {number}
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*/
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this.delta_ = options.delta ? options.delta : 1;
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/**
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* @private
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* @type {number}
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*/
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this.duration_ = options.duration !== undefined ? options.duration : 100;
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};
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inherits(KeyboardZoom, Interaction);
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/**
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* Handles the {@link ol.MapBrowserEvent map browser event} if it was a
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* `KeyEvent`, and decides whether to zoom in or out (depending on whether the
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* key pressed was '+' or '-').
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* @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
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* @return {boolean} `false` to stop event propagation.
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* @this {ol.interaction.KeyboardZoom}
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* @api
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*/
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KeyboardZoom.handleEvent = function(mapBrowserEvent) {
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let stopEvent = false;
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if (mapBrowserEvent.type == EventType.KEYDOWN ||
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mapBrowserEvent.type == EventType.KEYPRESS) {
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const keyEvent = mapBrowserEvent.originalEvent;
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const charCode = keyEvent.charCode;
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if (this.condition_(mapBrowserEvent) &&
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(charCode == '+'.charCodeAt(0) || charCode == '-'.charCodeAt(0))) {
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const map = mapBrowserEvent.map;
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const delta = (charCode == '+'.charCodeAt(0)) ? this.delta_ : -this.delta_;
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const view = map.getView();
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Interaction.zoomByDelta(
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view, delta, undefined, this.duration_);
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mapBrowserEvent.preventDefault();
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stopEvent = true;
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}
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}
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return !stopEvent;
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};
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export default KeyboardZoom;
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