/*

    File:       AppDelegate.m

    Contains:   Main app controller.

    Written by: DTS

    Copyright:  Copyright (c) 1997-2011 Apple Inc. All Rights Reserved.

    Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Inc.

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                this notice, no other rights or licenses, express or implied,

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                by other works in which the Apple Software may be incorporated.

                The Apple Software is provided by Apple on an "AS IS" basis. 

                APPLE MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING

                WITHOUT LIMITATION THE IMPLIED WARRANTIES OF NON-INFRINGEMENT,

                MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING

                THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

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*/

#import "AppDelegate.h"

#import "SillyBallsView.h"

@interface AppDelegate () <NSApplicationDelegate>

@property (nonatomic, assign, readwrite) BOOL       running;        // whether we are currently drawing

@property (nonatomic, assign, readwrite) double     ballRate;       // the rate at which we should draw

@end

@implementation AppDelegate

@synthesize window = window_;

@synthesize sillyBallView = sillyBallView_;

@synthesize ballRateSlider = sliderView_;

@synthesize ballRateLabel = textView_;

@synthesize running = running_;

@synthesize ballRate = ballRate_;

- (NSTimeInterval)intervalFromRate:(double)rate

    // We map the ball rate slider to a time interval via this function 

    // to get a pleasing non-linearity.

{

    return pow(10, -rate);

}

- (void)didChangeBallRate

    // After a ball rate change we need to update both the ball rate slider 

    // and its associated text field.  I could have done this with bindings 

    // but I decided to use the traditional target/action/outlet mechanism 

    // just to keep things simple.

{

    [self.ballRateSlider setDoubleValue:self.ballRate];

    self.sillyBallView.ballInterval = [self intervalFromRate:self.ballRate];

    [self.ballRateLabel setStringValue:[NSString stringWithFormat:@"%.1f", self.ballRate]];

}

#pragma mark * Application delegate methods

- (void)applicationDidFinishLaunching:(NSNotification *)note

    // An application delegate method called on startup.  We set up our 

    // default values and then apply them to the UI.

{

    #pragma unused(note)

    assert(self.window != nil);

    assert(self.sillyBallView != nil);

    assert(self.ballRateSlider != nil);

    assert(self.ballRateLabel != nil);

    // Set up the default values.

    self.running  = YES;

    self.ballRate = 1.0;

    // Apply them to the UI.

    [self didChangeBallRate];

    self.sillyBallView.ballInterval = [self intervalFromRate:self.ballRate];

    self.sillyBallView.running = self.running;

    // After everthing is set up, show our window.

    [self.window makeKeyAndOrderFront:self];

}

- (void)dealloc

    // The application delegate is never deallocated, so this is just a stub.

{

    assert(NO);

    [super dealloc];

}

- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)sender

    // An application delegate method called when the user closes the last 

    // window.  In our case, we do want the application to quit when the last 

    // window is closed.

{

    #pragma unused(sender)

    return YES;

}

#pragma mark * User interface actions

- (IBAction)startStopAction:(id)sender

    // See comment in header.

{

    NSButton *  senderButton;

    // Change our state.

    self.running = ! self.running;

    // Reflect that change to the view.

    self.sillyBallView.running = self.running;

    // Reflect that change to the menu item.

    senderButton = (NSButton *) sender;

    assert([senderButton isKindOfClass:[NSButton class]]);

    [senderButton setTitle:self.running ? @"Stop" : @"Start"];

}

- (IBAction)clearAction:(id)sender

    // See comment in header.

{

    #pragma unused(sender)

    // Just reflect this operation down to the view.

    [self.sillyBallView clear];

}

- (IBAction)sliderDidChangeAction:(id)sender

    // See comment in header.

{

    assert(sender == self.ballRateSlider);

    #pragma unused(sender)

    // Change our state.

    self.ballRate = [self.ballRateSlider doubleValue];

    // Reflect that change to the ball rate views.

    [self didChangeBallRate];

}

@end