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

## Statements: 20% (9 / 45) Branches: 10.34% (3 / 29) Functions: 10% (1 / 10) Lines: 20% (9 / 45)

All files » src/map/handler/ » Map.Drag.js

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    28
    29
    30
    31
    32
    33
    34
    35
    36
    37
    38
    39
    40
    41
    42
    43
    44
    45
    46
    47
    48
    49
    50
    51
    52
    53
    54
    55
    56
    57
    58
    59
    60
    61
    62
    63
    64
    65
    66
    67
    68
    69
    70
    71
    72
    73
    74
    75
    76
    77
    78
    79
    80
    81
    82
    83
    84
    85
    86
    87
    88
    89
    90
    91
    92
    93
    94
    95
    96
    97
    98
    99
    100
    101
    102
    103
    104
    105
    106
    107
    108
    109
    110
    111
    112
    113
    114
    115
    116
    117
    118
    119
    120
    121
    122
    123
    124
    125
    126
    127
    128
    129
    130
    131
    132
    133
    134
    135
    136
    137
    138
    139
    140
    141
    142
    143
    144
    145
    146
    147
    148
    149
    150
    151
    152
    153
    154
    155
    156

    1

    1

    50
    50

    50

    50

    50

    50

    1
     /*
     * 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);