DCSOlympus/frontend/react/src/map/touchboxselect.ts

import { Map, Point } from 'leaflet';
import { Handler } from 'leaflet';
import { Util } from 'leaflet';
import { DomUtil } from 'leaflet';
import { DomEvent } from 'leaflet';
import { LatLngBounds } from 'leaflet';
import { Bounds } from 'leaflet';

export var TouchBoxSelect = Handler.extend({
	initialize: function (map: Map) {
		this._map = map;
		this._container = map.getContainer();
		this._pane = map.getPanes().overlayPane;
		this._resetStateTimeout = 0;
		this._doubleClicked = false;
		map.on('unload', this._destroy, this);
	},

	addHooks: function () {
		DomEvent.on(this._container, 'touchstart', this._onMouseDown, this);
	},

	removeHooks: function () {
		DomEvent.off(this._container, 'touchstart', this._onMouseDown, this);
	},

	moved: function () {
		return this._moved;
	},

	_destroy: function () {
		DomUtil.remove(this._pane);
		delete this._pane;
	},

	_resetState: function () {
		this._resetStateTimeout = 0;
		this._moved = false;
	},

	_clearDeferredResetState: function () {
		if (this._resetStateTimeout !== 0) {
			clearTimeout(this._resetStateTimeout);
			this._resetStateTimeout = 0;
		}
	},

	_onMouseDown: function (e: any) {
		if ((e.which == 0)) {
			this._map.fire('selectionstart');
			// Clear the deferred resetState if it hasn't executed yet, otherwise it
			// will interrupt the interaction and orphan a box element in the container.
			this._clearDeferredResetState();
			this._resetState();

			DomUtil.disableTextSelection();
			DomUtil.disableImageDrag();

			this._startPoint = this._getMousePosition(e);

			//@ts-ignore
			DomEvent.on(document, {
				contextmenu: DomEvent.stop,
				touchmove: this._onMouseMove,
				touchend: this._onMouseUp
			}, this);
		} else {
			return false;
		}
	},

	_onMouseMove: function (e: any) {
		if (!this._moved) {
			this._moved = true;

			this._box = DomUtil.create('div', 'leaflet-zoom-box', this._container);
			DomUtil.addClass(this._container, 'leaflet-crosshair');
		}

		this._point = this._getMousePosition(e);

		var bounds = new Bounds(this._point, this._startPoint),
			size = bounds.getSize();

		if (bounds.min != undefined)
			DomUtil.setPosition(this._box, bounds.min);

		this._box.style.width = size.x + 'px';
		this._box.style.height = size.y + 'px';
	},

	_finish: function () {
		if (this._moved) {
			DomUtil.remove(this._box);
			DomUtil.removeClass(this._container, 'leaflet-crosshair');
		}

		DomUtil.enableTextSelection();
		DomUtil.enableImageDrag();

		//@ts-ignore
		DomEvent.off(document, {
			contextmenu: DomEvent.stop,
			touchmove: this._onMouseMove,
			touchend: this._onMouseUp
		}, this);
	},

	_onMouseUp: function (e: any) {
		if ((e.which !== 0)) { return; }

		this._finish();

		if (!this._moved) { return; }
		// Postpone to next JS tick so internal click event handling
		// still see it as "moved".
		window.setTimeout(Util.bind(this._resetState, this), 0);
		var bounds = new LatLngBounds(
			this._map.containerPointToLatLng(this._startPoint),
			this._map.containerPointToLatLng(this._point));

		this._map.fire('selectionend', { selectionBounds: bounds });
	},

	_getMousePosition(e: any) {
		var scale = DomUtil.getScale(this._container), offset = scale.boundingClientRect; // left and top  values are in page scale (like the event clientX/Y)
	
		return new Point(
			// offset.left/top values are in page scale (like clientX/Y),
			// whereas clientLeft/Top (border width) values are the original values (before CSS scale applies).
			(e.touches[0].clientX - offset.left) / scale.x - this._container.clientLeft,
			(e.touches[0].clientY - offset.top) / scale.y - this._container.clientTop
		);
	}
});