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425     // Returns true if |coordinates| point to a valid drop location. The
426     // coordinates are relative to the drag container and the object should
428     canDropOn: function(coordinates) {
435       if (coordinates.x >= right || coordinates.x < 0 ||
436           coordinates.y >= bottom || coordinates.y < 0)
439       var position = this.getIndexAt_(coordinates);
448     setDragPlaceholder: function(coordinates) {
449       var position = this.getIndexAt_(coordinates);
461     getIndexAt_: function(coordinates) {
467       var row = Math.floor(coordinates.y / h);
468       var col = Math.floor(coordinates.x / w);