Draggable.js
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// TODO Draggable for group
// FIXME Draggable on element which has parent rotation or scale
function Draggable() {
this.on('mousedown', this._dragStart, this);
this.on('mousemove', this._drag, this);
this.on('mouseup', this._dragEnd, this);
this.on('globalout', this._dragEnd, this); // this._dropTarget = null;
// this._draggingTarget = null;
// this._x = 0;
// this._y = 0;
}
Draggable.prototype = {
constructor: Draggable,
_dragStart: function (e) {
var draggingTarget = e.target;
if (draggingTarget && draggingTarget.draggable) {
this._draggingTarget = draggingTarget;
draggingTarget.dragging = true;
this._x = e.offsetX;
this._y = e.offsetY;
this.dispatchToElement(param(draggingTarget, e), 'dragstart', e.event);
}
},
_drag: function (e) {
var draggingTarget = this._draggingTarget;
if (draggingTarget) {
var x = e.offsetX;
var y = e.offsetY;
var dx = x - this._x;
var dy = y - this._y;
this._x = x;
this._y = y;
draggingTarget.drift(dx, dy, e);
this.dispatchToElement(param(draggingTarget, e), 'drag', e.event);
var dropTarget = this.findHover(x, y, draggingTarget).target;
var lastDropTarget = this._dropTarget;
this._dropTarget = dropTarget;
if (draggingTarget !== dropTarget) {
if (lastDropTarget && dropTarget !== lastDropTarget) {
this.dispatchToElement(param(lastDropTarget, e), 'dragleave', e.event);
}
if (dropTarget && dropTarget !== lastDropTarget) {
this.dispatchToElement(param(dropTarget, e), 'dragenter', e.event);
}
}
}
},
_dragEnd: function (e) {
var draggingTarget = this._draggingTarget;
if (draggingTarget) {
draggingTarget.dragging = false;
}
this.dispatchToElement(param(draggingTarget, e), 'dragend', e.event);
if (this._dropTarget) {
this.dispatchToElement(param(this._dropTarget, e), 'drop', e.event);
}
this._draggingTarget = null;
this._dropTarget = null;
}
};
function param(target, e) {
return {
target: target,
topTarget: e && e.topTarget
};
}
var _default = Draggable;
module.exports = _default;