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import {Evented} from '../core/Events';
import * as Browser from '../core/Browser';
import * as DomEvent from './DomEvent';
import * as DomUtil from './DomUtil';
import * as Util from '../core/Util';
import {Point} from '../geometry/Point';
/*
* @class Draggable
* @aka L.Draggable
* @inherits Evented
*
* A class for making DOM elements draggable (including touch support).
* Used internally for map and marker dragging. Only works for elements
* that were positioned with [`L.DomUtil.setPosition`](#domutil-setposition).
*
* @example
* ```js
* var draggable = new L.Draggable(elementToDrag);
* draggable.enable();
* ```
*/
var START = Browser.touch ? 'touchstart mousedown' : 'mousedown';
var END = {
mousedown: 'mouseup',
touchstart: 'touchend',
pointerdown: 'touchend',
MSPointerDown: 'touchend'
};
var MOVE = {
mousedown: 'mousemove',
touchstart: 'touchmove',
pointerdown: 'touchmove',
MSPointerDown: 'touchmove'
};
export var Draggable = Evented.extend({
options: {
// @section
// @aka Draggable options
// @option clickTolerance: Number = 3
// The max number of pixels a user can shift the mouse pointer during a click
// for it to be considered a valid click (as opposed to a mouse drag).
clickTolerance: 3
},
// @constructor L.Draggable(el: HTMLElement, dragHandle?: HTMLElement, preventOutline?: Boolean, options?: Draggable options)
// Creates a `Draggable` object for moving `el` when you start dragging the `dragHandle` element (equals `el` itself by default).
initialize: function (element, dragStartTarget, preventOutline, options) {
Util.setOptions(this, options);
this._element = element;
this._dragStartTarget = dragStartTarget || element;
this._preventOutline = preventOutline;
},
// @method enable()
// Enables the dragging ability
enable: function () {
if (this._enabled) { return; }
DomEvent.on(this._dragStartTarget, START, this._onDown, this);
this._enabled = true;
},
// @method disable()
// Disables the dragging ability
disable: function () {
if (!this._enabled) { return; }
// If we're currently dragging this draggable,
// disabling it counts as first ending the drag.
if (Draggable._dragging === this) {
this.finishDrag();
}
DomEvent.off(this._dragStartTarget, START, this._onDown, this);
this._enabled = false;
this._moved = false;
},
_onDown: function (e) {
// Ignore simulated events, since we handle both touch and
// mouse explicitly; otherwise we risk getting duplicates of
// touch events, see #4315.
// Also ignore the event if disabled; this happens in IE11
// under some circumstances, see #3666.
if (e._simulated || !this._enabled) { return; }
this._moved = false;
if (DomUtil.hasClass(this._element, 'leaflet-zoom-anim')) { return; }
if (Draggable._dragging || e.shiftKey || ((e.which !== 1) && (e.button !== 1) && !e.touches)) { return; }
Draggable._dragging = this; // Prevent dragging multiple objects at once.
if (this._preventOutline) {
DomUtil.preventOutline(this._element);
}
DomUtil.disableImageDrag();
DomUtil.disableTextSelection();
if (this._moving) { return; }
// @event down: Event
// Fired when a drag is about to start.
this.fire('down');
var first = e.touches ? e.touches[0] : e;
this._startPoint = new Point(first.clientX, first.clientY);
DomEvent.on(document, MOVE[e.type], this._onMove, this);
DomEvent.on(document, END[e.type], this._onUp, this);
},
_onMove: function (e) {
// Ignore simulated events, since we handle both touch and
// mouse explicitly; otherwise we risk getting duplicates of
// touch events, see #4315.
// Also ignore the event if disabled; this happens in IE11
// under some circumstances, see #3666.
if (e._simulated || !this._enabled) { return; }
if (e.touches && e.touches.length > 1) {
this._moved = true;
return;
}
var first = (e.touches && e.touches.length === 1 ? e.touches[0] : e),
newPoint = new Point(first.clientX, first.clientY),
offset = newPoint.subtract(this._startPoint);
if (!offset.x && !offset.y) { return; }
if (Math.abs(offset.x) + Math.abs(offset.y) < this.options.clickTolerance) { return; }
DomEvent.preventDefault(e);
if (!this._moved) {
// @event dragstart: Event
// Fired when a drag starts
this.fire('dragstart');
this._moved = true;
this._startPos = DomUtil.getPosition(this._element).subtract(offset);
DomUtil.addClass(document.body, 'leaflet-dragging');
this._lastTarget = e.target || e.srcElement;
// IE and Edge do not give the <use> element, so fetch it
// if necessary
if ((window.SVGElementInstance) && (this._lastTarget instanceof SVGElementInstance)) {
this._lastTarget = this._lastTarget.correspondingUseElement;
}
DomUtil.addClass(this._lastTarget, 'leaflet-drag-target');
}
this._newPos = this._startPos.add(offset);
this._moving = true;
Util.cancelAnimFrame(this._animRequest);
this._lastEvent = e;
this._animRequest = Util.requestAnimFrame(this._updatePosition, this, true);
},
_updatePosition: function () {
var e = {originalEvent: this._lastEvent};
// @event predrag: Event
// Fired continuously during dragging *before* each corresponding
// update of the element's position.
this.fire('predrag', e);
DomUtil.setPosition(this._element, this._newPos);
// @event drag: Event
// Fired continuously during dragging.
this.fire('drag', e);
},
_onUp: function (e) {
// Ignore simulated events, since we handle both touch and
// mouse explicitly; otherwise we risk getting duplicates of
// touch events, see #4315.
// Also ignore the event if disabled; this happens in IE11
// under some circumstances, see #3666.
if (e._simulated || !this._enabled) { return; }
this.finishDrag();
},
finishDrag: function () {
DomUtil.removeClass(document.body, 'leaflet-dragging');
if (this._lastTarget) {
DomUtil.removeClass(this._lastTarget, 'leaflet-drag-target');
this._lastTarget = null;
}
for (var i in MOVE) {
DomEvent.off(document, MOVE[i], this._onMove, this);
DomEvent.off(document, END[i], this._onUp, this);
}
DomUtil.enableImageDrag();
DomUtil.enableTextSelection();
if (this._moved && this._moving) {
// ensure drag is not fired after dragend
Util.cancelAnimFrame(this._animRequest);
// @event dragend: DragEndEvent
// Fired when the drag ends.
this.fire('dragend', {
distance: this._newPos.distanceTo(this._startPos)
});
}
this._moving = false;
Draggable._dragging = false;
}
});
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