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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);
|