Code coverage report for src/map/handler/Map.Drag.js

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All files » src/map/handler/ » Map.Drag.js
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/*
 * L.Handler.MapDrag is used to make the map draggable (with panning inertia), enabled by default.
 */
 
L.Map.mergeOptions({
	dragging: true,
 
	inertia: !L.Browser.android23,
	inertiaDeceleration: 3400, // px/s^2
	inertiaMaxSpeed: Infinity, // px/s
	inertiaThreshold: L.Browser.touch ? 32 : 18, // ms
	easeLinearity: 0.25,
 
	longPress: true,
 
	// TODO refactor, move to CRS
	worldCopyJump: false
});
 
L.Map.Drag = L.Handler.extend({
	addHooks: function () {
		Eif (!this._draggable) {
			var map = this._map;
 
			this._draggable = new L.Draggable(map._mapPane, map._container, map.options.longPress);
 
			this._draggable.on({
				'dragstart': this._onDragStart,
				'drag': this._onDrag,
				'dragend': this._onDragEnd
			}, this);
 
			Iif (map.options.worldCopyJump) {
				this._draggable.on('predrag', this._onPreDrag, this);
				map.on('viewreset', this._onViewReset, this);
			}
		}
		this._draggable.enable();
	},
 
	removeHooks: function () {
		this._draggable.disable();
	},
 
	moved: function () {
		return this._draggable && this._draggable._moved;
	},
 
	_onDragStart: function () {
		var map = this._map;
 
		if (map._panAnim) {
			map._panAnim.stop();
		}
 
		map
		    .fire('movestart')
		    .fire('dragstart');
 
		if (map.options.inertia) {
			this._positions = [];
			this._times = [];
		}
	},
 
	_onDrag: function () {
		if (this._map.options.inertia) {
			var time = this._lastTime = +new Date(),
			    pos = this._lastPos = this._draggable._newPos;
 
			this._positions.push(pos);
			this._times.push(time);
 
			if (time - this._times[0] > 200) {
				this._positions.shift();
				this._times.shift();
			}
		}
 
		this._map
		    .fire('move')
		    .fire('drag');
	},
 
	_onViewReset: function () {
		// TODO fix hardcoded Earth values
		var pxCenter = this._map.getSize()._divideBy(2),
		    pxWorldCenter = this._map.latLngToLayerPoint(new L.LatLng(0, 0));
 
		this._initialWorldOffset = pxWorldCenter.subtract(pxCenter).x;
		this._worldWidth = this._map.project(new L.LatLng(0, 180)).x;
	},
 
	_onPreDrag: function () {
		// TODO refactor to be able to adjust map pane position after zoom
		var worldWidth = this._worldWidth,
		    halfWidth = Math.round(worldWidth / 2),
		    dx = this._initialWorldOffset,
		    x = this._draggable._newPos.x,
		    newX1 = (x - halfWidth + dx) % worldWidth + halfWidth - dx,
		    newX2 = (x + halfWidth + dx) % worldWidth - halfWidth - dx,
		    newX = Math.abs(newX1 + dx) < Math.abs(newX2 + dx) ? newX1 : newX2;
 
		this._draggable._newPos.x = newX;
	},
 
	_onDragEnd: function () {
		var map = this._map,
		    options = map.options,
		    delay = +new Date() - this._lastTime,
 
		    noInertia = !options.inertia || delay > options.inertiaThreshold || !this._positions[0];
 
		map.fire('dragend');
 
		if (noInertia) {
			map.fire('moveend');
 
		} else {
 
			var direction = this._lastPos.subtract(this._positions[0]),
			    duration = (this._lastTime + delay - this._times[0]) / 1000,
			    ease = options.easeLinearity,
 
			    speedVector = direction.multiplyBy(ease / duration),
			    speed = speedVector.distanceTo(new L.Point(0, 0)),
 
			    limitedSpeed = Math.min(options.inertiaMaxSpeed, speed),
			    limitedSpeedVector = speedVector.multiplyBy(limitedSpeed / speed),
 
			    decelerationDuration = limitedSpeed / (options.inertiaDeceleration * ease),
			    offset = limitedSpeedVector.multiplyBy(-decelerationDuration / 2).round();
 
			if (!offset.x || !offset.y) {
				map.fire('moveend');
 
			} else {
				L.Util.requestAnimFrame(function () {
					map.panBy(offset, decelerationDuration, ease, true);
				});
			}
		}
 
		if (options.maxBounds) {
			// TODO predrag validation instead of animation
			L.Util.requestAnimFrame(this._panInsideMaxBounds, map, true, map._container);
		}
	},
 
	_panInsideMaxBounds: function () {
		this.panInsideBounds(this.options.maxBounds);
	}
});
 
L.Map.addInitHook('addHandler', 'dragging', L.Map.Drag);