/*

     File: APLCustomDynamicItemViewController.m

 Abstract: Provides the "Custom Dynamic Item" demonstration.

  Version: 1.3

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 */

#import "APLCustomDynamicItemViewController.h"

#import "APLPositionToBoundsMapping.h"

@interface APLCustomDynamicItemViewController ()

@property (nonatomic, weak) IBOutlet UIButton *button1;

@property (nonatomic, readwrite) CGRect button1Bounds;

@property (nonatomic, strong) UIDynamicAnimator *animator;

@end

@implementation APLCustomDynamicItemViewController

//| ----------------------------------------------------------------------------

- (void)viewDidLoad

{

    // Save the button's initial bounds.  This is necessary so that the bounds

    // can be reset to their initial state before starting a new simulation.

    // Otherwise, the new simulation will continue from the bounds set in the

    // final step of the previous simulation which may have been interrupted

    // before it came to rest (e.g. the user tapped the button twice in quick

    // succession).  Without reverting to the initial bounds, this would cause

    // the button to grow uncontrollably in size.

    self.button1Bounds = self.button1.bounds;

    // Force the button image to scale with its bounds.

    self.button1.contentHorizontalAlignment = UIControlContentHorizontalAlignmentFill;

    self.button1.contentVerticalAlignment = UIControlContentHorizontalAlignmentFill;

}

//| ----------------------------------------------------------------------------

//  IBAction for tapping the button in this demo.

//

- (IBAction)buttonAction:(id)sender

{

    // Reset the buttons bounds to their initial state.  See the comment in

    // -viewDidLoad.

    self.button1.bounds = self.button1Bounds;

    // UIDynamicAnimator instances are relatively cheap to create.

    UIDynamicAnimator *animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.view];

    // APLPositionToBoundsMapping maps the center of an id<ResizableDynamicItem>

    // (UIDynamicItem with mutable bounds) to its bounds.  As dynamics modifies

    // the center.x, the changes are forwarded to the bounds.size.width.

    // Similarly, as dynamics modifies the center.y, the changes are forwarded

    // to bounds.size.height.

    APLPositionToBoundsMapping *buttonBoundsDynamicItem = [[APLPositionToBoundsMapping alloc] initWithTarget:sender];

    // Create an attachment between the buttonBoundsDynamicItem and the initial

    // value of the button's bounds.

    UIAttachmentBehavior *attachmentBehavior = [[UIAttachmentBehavior alloc] initWithItem:buttonBoundsDynamicItem attachedToAnchor:buttonBoundsDynamicItem.center];

    [attachmentBehavior setFrequency:2.0];

    [attachmentBehavior setDamping:0.3];

    [animator addBehavior:attachmentBehavior];

    UIPushBehavior *pushBehavior = [[UIPushBehavior alloc] initWithItems:@[buttonBoundsDynamicItem] mode:UIPushBehaviorModeInstantaneous];

    pushBehavior.angle = M_PI_4;

    pushBehavior.magnitude = 2.0;

    [animator addBehavior:pushBehavior];

    [pushBehavior setActive:TRUE];

    self.animator = animator;

}

@end