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box_zoom.js
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box_zoom.js
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// @flow
import DOM from '../../util/dom.js';
import {Event} from '../../util/evented.js';
import type Map from '../map.js';
/**
* The `BoxZoomHandler` allows the user to zoom the map to fit within a bounding box.
* The bounding box is defined by clicking and holding `shift` while dragging the cursor.
*
* @see [Example: Toggle interactions](https://docs.mapbox.com/mapbox-gl-js/example/toggle-interaction-handlers/)
* @see [Example: Highlight features within a bounding box](https://docs.mapbox.com/mapbox-gl-js/example/using-box-queryrenderedfeatures/)
*/
class BoxZoomHandler {
_map: Map;
_el: HTMLElement;
_container: HTMLElement;
_enabled: boolean;
_active: boolean;
_startPos: Point;
_lastPos: Point;
_box: HTMLElement;
_clickTolerance: number;
/**
* @private
*/
constructor(map: Map, options: {
clickTolerance: number
}) {
this._map = map;
this._el = map.getCanvasContainer();
this._container = map.getContainer();
this._clickTolerance = options.clickTolerance || 1;
}
/**
* Returns a Boolean indicating whether the "box zoom" interaction is enabled.
*
* @returns {boolean} Returns `true` if the "box zoom" interaction is enabled.
* @example
* const isBoxZoomEnabled = map.boxZoom.isEnabled();
*/
isEnabled() {
return !!this._enabled;
}
/**
* Returns a Boolean indicating whether the "box zoom" interaction is active (currently being used).
*
* @returns {boolean} Returns `true` if the "box zoom" interaction is active.
* @example
* const isBoxZoomActive = map.boxZoom.isActive();
*/
isActive() {
return !!this._active;
}
/**
* Enables the "box zoom" interaction.
*
* @example
* map.boxZoom.enable();
*/
enable() {
if (this.isEnabled()) return;
this._enabled = true;
}
/**
* Disables the "box zoom" interaction.
*
* @example
* map.boxZoom.disable();
*/
disable() {
if (!this.isEnabled()) return;
this._enabled = false;
}
mousedown(e: MouseEvent, point: Point) {
if (!this.isEnabled()) return;
if (!(e.shiftKey && e.button === 0)) return;
DOM.disableDrag();
this._startPos = this._lastPos = point;
this._active = true;
}
mousemoveWindow(e: MouseEvent, point: Point) {
if (!this._active) return;
const pos = point;
if (this._lastPos.equals(pos) || (!this._box && pos.dist(this._startPos) < this._clickTolerance)) {
return;
}
const p0 = this._startPos;
this._lastPos = pos;
if (!this._box) {
this._box = DOM.create('div', 'mapboxgl-boxzoom', this._container);
this._container.classList.add('mapboxgl-crosshair');
this._fireEvent('boxzoomstart', e);
}
const minX = Math.min(p0.x, pos.x),
maxX = Math.max(p0.x, pos.x),
minY = Math.min(p0.y, pos.y),
maxY = Math.max(p0.y, pos.y);
this._map._requestDomTask(() => {
if (this._box) {
DOM.setTransform(this._box, `translate(${minX}px,${minY}px)`);
this._box.style.width = `${maxX - minX}px`;
this._box.style.height = `${maxY - minY}px`;
}
});
}
mouseupWindow(e: MouseEvent, point: Point) {
if (!this._active) return;
if (e.button !== 0) return;
const p0 = this._startPos,
p1 = point;
this.reset();
DOM.suppressClick();
if (p0.x === p1.x && p0.y === p1.y) {
this._fireEvent('boxzoomcancel', e);
} else {
this._map.fire(new Event('boxzoomend', {originalEvent: e}));
return {
cameraAnimation: map => map.fitScreenCoordinates(p0, p1, this._map.getBearing(), {linear: false})
};
}
}
keydown(e: KeyboardEvent) {
if (!this._active) return;
if (e.keyCode === 27) {
this.reset();
this._fireEvent('boxzoomcancel', e);
}
}
blur() {
this.reset();
}
reset() {
this._active = false;
this._container.classList.remove('mapboxgl-crosshair');
if (this._box) {
DOM.remove(this._box);
this._box = (null: any);
}
DOM.enableDrag();
delete this._startPos;
delete this._lastPos;
}
_fireEvent(type: string, e: *) {
return this._map.fire(new Event(type, {originalEvent: e}));
}
}
export default BoxZoomHandler;