/
navigation_control.js
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navigation_control.js
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// @flow
import DOM from '../../util/dom';
import {extend, bindAll} from '../../util/util';
import DragRotateHandler from '../handler/drag_rotate';
import type Map from '../map';
type Options = {
showCompass?: boolean,
showZoom?: boolean,
visualizePitch?: boolean
};
const defaultOptions: Options = {
showCompass: true,
showZoom: true,
visualizePitch: false
};
/**
* A `NavigationControl` control contains zoom buttons and a compass.
*
* @implements {IControl}
* @param {Object} [options]
* @param {Boolean} [options.showCompass=true] If `true` the compass button is included.
* @param {Boolean} [options.showZoom=true] If `true` the zoom-in and zoom-out buttons are included.
* @param {Boolean} [options.visualizePitch=false] If `true` the pitch is visualized by rotating X-axis of compass.
* @example
* var nav = new mapboxgl.NavigationControl();
* map.addControl(nav, 'top-left');
* @see [Display map navigation controls](https://www.mapbox.com/mapbox-gl-js/example/navigation/)
* @see [Add a third party vector tile source](https://www.mapbox.com/mapbox-gl-js/example/third-party/)
*/
class NavigationControl {
_map: Map;
options: Options;
_container: HTMLElement;
_zoomInButton: HTMLButtonElement;
_zoomOutButton: HTMLButtonElement;
_compass: HTMLButtonElement;
_compassIcon: HTMLElement;
_handler: DragRotateHandler;
constructor(options: Options) {
this.options = extend({}, defaultOptions, options);
this._container = DOM.create('div', 'mapboxgl-ctrl mapboxgl-ctrl-group');
this._container.addEventListener('contextmenu', (e) => e.preventDefault());
if (this.options.showZoom) {
bindAll([
'_setButtonTitle',
'_updateZoomButtons'
], this);
this._zoomInButton = this._createButton('mapboxgl-ctrl-zoom-in', (e) => this._map.zoomIn({}, {originalEvent: e}));
DOM.create('span', `mapboxgl-ctrl-icon`, this._zoomInButton).setAttribute('aria-hidden', true);
this._zoomOutButton = this._createButton('mapboxgl-ctrl-zoom-out', (e) => this._map.zoomOut({}, {originalEvent: e}));
DOM.create('span', `mapboxgl-ctrl-icon`, this._zoomOutButton).setAttribute('aria-hidden', true);
}
if (this.options.showCompass) {
bindAll([
'_rotateCompassArrow'
], this);
this._compass = this._createButton('mapboxgl-ctrl-compass', (e) => {
if (this.options.visualizePitch) {
this._map.resetNorthPitch({}, {originalEvent: e});
} else {
this._map.resetNorth({}, {originalEvent: e});
}
});
this._compassIcon = DOM.create('span', 'mapboxgl-ctrl-icon', this._compass);
this._compassIcon.setAttribute('aria-hidden', true);
}
}
_updateZoomButtons() {
const zoom = this._map.getZoom();
this._zoomInButton.disabled = zoom === this._map.getMaxZoom();
this._zoomOutButton.disabled = zoom === this._map.getMinZoom();
}
_rotateCompassArrow() {
const rotate = this.options.visualizePitch ?
`scale(${1 / Math.pow(Math.cos(this._map.transform.pitch * (Math.PI / 180)), 0.5)}) rotateX(${this._map.transform.pitch}deg) rotateZ(${this._map.transform.angle * (180 / Math.PI)}deg)` :
`rotate(${this._map.transform.angle * (180 / Math.PI)}deg)`;
this._compassIcon.style.transform = rotate;
}
onAdd(map: Map) {
this._map = map;
if (this.options.showZoom) {
this._setButtonTitle(this._zoomInButton, 'ZoomIn');
this._setButtonTitle(this._zoomOutButton, 'ZoomOut');
this._map.on('zoom', this._updateZoomButtons);
this._updateZoomButtons();
}
if (this.options.showCompass) {
this._setButtonTitle(this._compass, 'ResetBearing');
if (this.options.visualizePitch) {
this._map.on('pitch', this._rotateCompassArrow);
}
this._map.on('rotate', this._rotateCompassArrow);
this._rotateCompassArrow();
this._handler = new DragRotateHandler(map, {button: 'left', element: this._compass});
DOM.addEventListener(this._compass, 'mousedown', this._handler.onMouseDown);
DOM.addEventListener(this._compass, 'touchstart', this._handler.onMouseDown, {passive: false});
this._handler.enable();
}
return this._container;
}
onRemove() {
DOM.remove(this._container);
if (this.options.showZoom) {
this._map.off('zoom', this._updateZoomButtons);
}
if (this.options.showCompass) {
if (this.options.visualizePitch) {
this._map.off('pitch', this._rotateCompassArrow);
}
this._map.off('rotate', this._rotateCompassArrow);
DOM.removeEventListener(this._compass, 'mousedown', this._handler.onMouseDown);
DOM.removeEventListener(this._compass, 'touchstart', this._handler.onMouseDown, {passive: false});
this._handler.disable();
delete this._handler;
}
delete this._map;
}
_createButton(className: string, fn: () => mixed) {
const a = DOM.create('button', className, this._container);
a.type = 'button';
a.addEventListener('click', fn);
return a;
}
_setButtonTitle(button: HTMLButtonElement, title: string) {
const str = this._map._getUIString(`NavigationControl.${title}`);
button.title = str;
button.setAttribute('aria-label', str);
}
}
export default NavigationControl;