};
    Screen.prototype.swap = function(dim, side) {
        // console.log('swap:', dim, side);
        // var other = this.edges[dim][side];
        // // Swap edges
        // var temp = this.edges;
        // this.edges = other.edges;
        // this.edges[1 - side] = other;
        // other.edges = temp;
        // other.edges[side] = this;
        // // Reposition other screen
        // var pos = other.pos;
        // var offset = ((this.size[dim] + other.size[dim]) / 2 + gridPad);
        // pos[dim] -= (2 * side - 1) * offset;
        // other.setPos(pos);

    };
    Screen.prototype.dragStart = function(e) {
        this.edges = [[null, null], [null, null]];

        // Swap when this center meets the edge of another screen
        this.pos.forEach((val, dim) => {
            this.edges[dim].forEach((other, side) => {
                if (other && val >= other.pos[dim] - (2 * side - 1) * other.size[dim] / 2) {
                    this.swap(dim, side);
                }
            });
        });

        console.log(this);