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              var Surface = Samsara.DOM.Surface;
var Context = Samsara.DOM.Context;
var Transform = Samsara.Core.Transform;
var MouseInput = Samsara.Inputs.MouseInput;
var Accumulator = Samsara.Streams.Accumulator;

var mouseInput = new MouseInput({
    direction : MouseInput.DIRECTION.X

// An accumulator is a stream that adds up all values it subscribes to over time
var displacement = new Accumulator(0);

// Send the deltas of the mouse movement to the displacement accumulator

var redSize = displacement.map(function(value){
    var length = value + 100;
    return [length, length];

var redSurface = new Surface({
    content : 'drag me',
    size : redSize,
    properties : {
      background : 'red',
      cursor : 'ew-resize'

var blueTransform = redSurface.size.map(function(size){
    return Transform.translateX(size[0]);

var blueSurface = new Surface({
    size : [100, 100],
    properties : {background : 'blue'}

var context = new Context();

// The mouse input listens to mouse events on the redSurface

var dragDisplacement = displacement.map(function(value){
    return Transform.translateX(value);

// Both surfaces are affected by translating by the mouse displacement
var dragNode = context.add({transform : dragDisplacement});

dragNode.add({transform : blueTransform}).add(blueSurface)


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