gistfile1.js

  mouseDragged: function(evt) {
    
    var info = this._mouseDownInfo;
    var layout = this.get('layout');
    var parentLayout = this.get('parentView').get('layout');
    
    var loc;
    
    // handle X direction
    loc = info.left + (evt.pageX - info.pageX);
    if (loc < 0) {
      loc = 0;
    }
    else if (loc >= (parentLayout.width - layout.width)) {
      loc = (parentLayout.width - layout.width);
    }
    
    this.adjust('left', loc);

    // handle Y direction
    loc = info.top + (evt.pageY - info.pageY);
    if (loc < 0) {
      loc = 0;
    }
    else if (loc >= (parentLayout.height - layout.height)) {
      loc = (parentLayout.height - layout.height);
    }
    
    this.adjust('top', loc);

    return YES;
  }
  
});