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box_zoom.js
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box_zoom.js
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// @flow
import DOM from '../../util/dom';
import LngLatBounds from '../../geo/lng_lat_bounds';
import { bindAll } from '../../util/util';
import window from '../../util/window';
import { Event } from '../../util/evented';
import type Map from '../map';
/**
* 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.
*/
class BoxZoomHandler {
_map: Map;
_el: HTMLElement;
_container: HTMLElement;
_enabled: boolean;
_active: boolean;
_startPos: any;
_box: HTMLElement;
/**
* @private
*/
constructor(map: Map) {
this._map = map;
this._el = map.getCanvasContainer();
this._container = map.getContainer();
bindAll([
'_onMouseMove',
'_onMouseUp',
'_onKeyDown'
], this);
}
/**
* Returns a Boolean indicating whether the "box zoom" interaction is enabled.
*
* @returns {boolean} `true` if the "box zoom" interaction is enabled.
*/
isEnabled() {
return !!this._enabled;
}
/**
* Returns a Boolean indicating whether the "box zoom" interaction is active, i.e. currently being used.
*
* @returns {boolean} `true` if the "box zoom" interaction is active.
*/
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;
}
onMouseDown(e: MouseEvent) {
if (!this.isEnabled()) return;
if (!(e.shiftKey && e.button === 0)) return;
window.document.addEventListener('mousemove', this._onMouseMove, false);
window.document.addEventListener('keydown', this._onKeyDown, false);
window.document.addEventListener('mouseup', this._onMouseUp, false);
DOM.disableDrag();
this._startPos = DOM.mousePos(this._el, e);
this._active = true;
}
_onMouseMove(e: MouseEvent) {
const p0 = this._startPos,
p1 = DOM.mousePos(this._el, e);
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, p1.x),
maxX = Math.max(p0.x, p1.x),
minY = Math.min(p0.y, p1.y),
maxY = Math.max(p0.y, p1.y);
DOM.setTransform(this._box, `translate(${minX}px,${minY}px)`);
this._box.style.width = `${maxX - minX}px`;
this._box.style.height = `${maxY - minY}px`;
}
_onMouseUp(e: MouseEvent) {
if (e.button !== 0) return;
const p0 = this._startPos,
p1 = DOM.mousePos(this._el, e),
bounds = new LngLatBounds()
.extend(this._map.unproject(p0))
.extend(this._map.unproject(p1));
this._finish();
DOM.suppressClick();
if (p0.x === p1.x && p0.y === p1.y) {
this._fireEvent('boxzoomcancel', e);
} else {
this._map
.fitBounds(bounds, {linear: true})
.fire(new Event('boxzoomend', { originalEvent: e, boxZoomBounds: bounds }));
}
}
_onKeyDown(e: KeyboardEvent) {
if (e.keyCode === 27) {
this._finish();
this._fireEvent('boxzoomcancel', e);
}
}
_finish() {
this._active = false;
window.document.removeEventListener('mousemove', this._onMouseMove, false);
window.document.removeEventListener('keydown', this._onKeyDown, false);
window.document.removeEventListener('mouseup', this._onMouseUp, false);
this._container.classList.remove('mapboxgl-crosshair');
if (this._box) {
DOM.remove(this._box);
this._box = (null: any);
}
DOM.enableDrag();
}
_fireEvent(type: string, e: *) {
return this._map.fire(new Event(type, { originalEvent: e }));
}
}
export default BoxZoomHandler;