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Viewing file:     Draggable.js (2.75 KB)      -rw-r--r--

// 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);
    // `mosuemove` and `mouseup` can be continue to fire when dragging.
    // See [Drag outside] in `Handler.js`. So we do not need to trigger
    // `_dragEnd` when globalout. That would brings better user experience.
    // 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;
        // Find if there is draggable in the ancestor
        while (draggingTarget && !draggingTarget.draggable) {
            draggingTarget = draggingTarget.parent;
        }
        if (draggingTarget) {
            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};
}

export default Draggable;