/*

 Copyright (C) 2017 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 A NSViewController subclass showing how to use IBActions to manipulate a view.

 */

import Cocoa

class ViewController: NSViewController {

    @IBOutlet weak var dotView: DotView!

    // radiusChanged(_:) is an action method which lets you change the radius of the dot.

    // A possible optimization is to check to see if the old and new value is the same,

    // and not do anything if so.

    @IBAction func radiusChanged(_ sender: NSSlider) {

        dotView.radius = CGFloat(sender.doubleValue)

    }

    // colorChanged(_:) is an action method which lets you change the color of the dot.

    // A possible optimization is to check to see if the old and new value is the same,

    // and not do anything if so.

    @IBAction func colorChanged(_ sender: NSColorWell) {

        dotView.color = sender.color

    }

    // The recommended way to handle events is to override NSResponder (superclass

    // of NSView) methods in the NSView subclass. One such method is mouseUp(with:).

    // These methods get the event as the argument. The event has the mouse

    // location in window coordinates; use convert(_:from:) (with "nil"

    // as the view argument) to convert this point to view coordinates local

    // to dotView.

    //

    // Note that once we set the new center, needsDisplay is set to true in the center

    // property's didSet observer to mark that the view needs to be redisplayed (which

    // is done automatically by AppKit).

    override func mouseUp(with event: NSEvent) {

        let eventLocation = event.locationInWindow

        dotView.center = dotView.convert(eventLocation, from: nil)

    }

}