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Controller.rb

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class Controller

attr_accessor :mySuperview, :numberText, :speedText, :numberSlider, :speedSlider

def init

super

@objs = [] # This will hold the ViewModel objects.

# A global flag to keep track of whether one of the subviews is moving.

# There is no particular reason why I used a global instead of a method call

# to mySuperview to retrieve an objMoving instance variable. A global

# just seems perfectly acceptable for this kind of thing.

$objMoving = false

self

end

def awakeFromNib

for n in 0..(@numberSlider.intValue-1)

addNewViewModel

end

end

def adjustNumberOfViewModels

desired = @numberSlider.intValue

current = @objs.length

if current < desired

for n in 1..(desired-current)

addNewViewModel

end

end

if current > desired

until @objs.length == desired

@objs.last.removeFromSuperview

@objs.pop

end

end

end

def addNewViewModel

myRect = getRandomViewRect

# Create a new ViewModel object, which is a subclass of NSView.

myObj = ViewModel.alloc.initWithFrame myRect

# Just for testing, the object knows its number.

myObj.setNum @objs.size

# Add it to the superview

@mySuperview.addSubview myObj

# Add it to the array

@objs.push myObj

end

def numberSliderAction(sender)

number = @numberSlider.intValue

@numberText.stringValue = "Number: " + number.to_s

adjustNumberOfViewModels

end

def moveButtonAction(sender)

# Assign new destinations to the objects

@objs.each do |obj|

destPt = getRandomViewPoint

obj.setMoveDestination destPt

speed = @speedSlider.floatValue

obj.setSpeed speed

obj.startMovement

end

end

def speedSliderAction(sender)

# No need to store the speed in an instance variable, since the speed is read

# right from the control in moveButtonAction. Just update the speed text.

speed = @speedSlider.floatValue

@objs.each do |obj|

if obj.speed > 0 # object is moving

obj.setSpeed speed

end

end

speed = speed.to_i

@speedText.stringValue = "Speed: " + speed.to_s

end

def getRandomViewRect

rx = rand(@mySuperview.bounds.size.width - SQUARE_SIZE)

ry = rand(@mySuperview.bounds.size.height - SQUARE_SIZE)

NSRect.new(NSPoint.new(rx, ry), NSSize.new(SQUARE_SIZE, SQUARE_SIZE))

end

def getRandomViewPoint

rx = rand(@mySuperview.bounds.size.width - SQUARE_SIZE)

ry = rand(@mySuperview.bounds.size.height - SQUARE_SIZE)

NSPoint.new(rx, ry)

end

def handleEvents

app = NSApplication.sharedApplication

event = app.nextEventMatchingMask NSAnyEventMask,

untilDate:NSDate.dateWithTimeIntervalSinceNow(0.01),

inMode:OSX.NSDefaultRunLoopMode,

dequeue:true

if event

# Could put special event handling here.

app.sendEvent(event)

end

end

end