/*

     File: APLAppDelegate.m

 Abstract: Application delegate that configures the sharing buttons and acts as a controller to manage the sharing services.

  Version: 1.1

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 */

#import "APLAppDelegate.h"

@interface APLAppDelegate ()

@property (weak) IBOutlet NSImageView *imageView;

@property (unsafe_unretained) IBOutlet NSTextView *textView;

/*

 Outlets to the service buttons so they can be appropriately configured with service images etc.

 Note also that sharing services should be invoked on mouse down, not mouse up.

 */

@property (weak) IBOutlet NSButton *tweetButton;

@property (weak) IBOutlet NSButton *emailButton;

@property (weak) IBOutlet NSButton *chooseServiceButton;

@property (weak) IBOutlet NSButton *chooseFromTextFieldButton;

@property (weak) IBOutlet NSButton *includeImageSwitch;

@property IBOutlet NSWindow *window;

@property NSSharingService *tweetSharingService;

@property NSSharingService *emailSharingService;

@end

#pragma mark - APLAppDelegate implementation

@implementation APLAppDelegate

/*

 Configure the application window and the sharing services.

 */

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {

    /*

     Get the Twitter sharing service.

     Update the tweet button's title and icons to display the name of the service and the corresponding images.

     Set the service's delegate to self.

     Use canPerformWithItems: to test whether the service is enabled. If it isn't, disable the button.

    */

    NSSharingService *tweetSharingService = [NSSharingService sharingServiceNamed:NSSharingServiceNamePostOnTwitter];

    self.tweetButton.title = tweetSharingService.title;

    self.tweetButton.image = tweetSharingService.image;

    self.tweetButton.alternateImage = tweetSharingService.alternateImage;

    if ([tweetSharingService canPerformWithItems:nil]) {

        [self.tweetButton setEnabled:YES];

    }

    else {

        [self.tweetButton setEnabled:NO];

    }

    tweetSharingService.delegate = self;

    self.tweetSharingService = tweetSharingService;

    /*

     Get the Email sharing service.

     Update the email button's title and icons to display the name of the service and the corresponding images.

     Set the service's delegate to self.

    */

    NSSharingService *emailSharingService = [NSSharingService sharingServiceNamed:NSSharingServiceNameComposeEmail];

    self.emailButton.title = emailSharingService.title;

    self.emailButton.image = emailSharingService.image;

    self.emailButton.alternateImage = emailSharingService.alternateImage;

    emailSharingService.delegate = self;

    self.emailSharingService = emailSharingService;

    self.imageView.image = [NSImage imageNamed:@"egg"];

    self.textView.string = @"Hello, world.";

    /*

     Buttons triggering the Sharing Service Picker should be invoked on mouse down, not mouse up.

     */

    [self.chooseServiceButton sendActionOn:NSLeftMouseDownMask];

    [self.chooseFromTextFieldButton sendActionOn:NSLeftMouseDownMask];

}

- (IBAction)shareUsingEmail:(id)sender

{    

    /*

     Create the array of items to share.

     Start with just the content of the text view. If there's an image, add that too.

     */

    NSMutableArray *shareItems = [[NSMutableArray alloc] initWithObjects:[self.textView attributedString], nil];

    NSImage *image = [self.imageView image];

    if (image) {

        [shareItems addObject:image];

    }

    /*

     Perform the service using the array of items.

     */

    [self.emailSharingService performWithItems:shareItems];

}

- (IBAction)shareUsingTwitter:(id)sender

{

    /*

     Create the array of items to share.

     Start with just the content of the text view. If there's an image, add that too.

     */

    NSMutableArray *shareItems = [[NSMutableArray alloc] initWithObjects:[self.textView attributedString], nil];

    if ([self.includeImageSwitch state] == NSOnState) {

        NSImage *image = [self.imageView image];

        if (image) {

            [shareItems addObject:image];

        }

    }    

    /*

     Perform the service using the array of items.

     */

    [self.tweetSharingService performWithItems:shareItems];

}

- (IBAction)chooseFromSharingServicePicker:(id)sender

{

    /*

     Create the array of items to share.

     Start with just the content of the text view. If there's an image, add that too.

     */

    NSMutableArray *shareItems = [NSMutableArray arrayWithObject:[self.textView attributedString]];

    NSImage *image = [self.imageView image];

    if (image) {

        [shareItems addObject:image];

    }

    /*

     Create a sharing service picker using the items.

     Set its delegate to self; the actual services are then set up in sharingServicePicker:sharingServicesForItems:proposedSharingServices:.

     Finally, display the picker.

     */

    NSSharingServicePicker *sharingServicePicker = [[NSSharingServicePicker alloc] initWithItems:shareItems];

    sharingServicePicker.delegate = self;

    [sharingServicePicker showRelativeToRect:[self.chooseServiceButton bounds] ofView:self.chooseServiceButton preferredEdge:NSMaxYEdge];

}

#pragma mark - Sharing service picker delegate methods

- (NSArray *)sharingServicePicker:(NSSharingServicePicker *)sharingServicePicker sharingServicesForItems:(NSArray *)items proposedSharingServices:(NSArray *)proposedServices

{

    /*

     If you're only interested in providing your own services, you could ignore the array of proposed services and construct and return your own array. Alternatively, as shown here, you add your service to the list of those offered by the system.

     */

    NSArray *services = proposedServices;

    /*

     Example of a custom sharing service:

     Search the array of items to find the first instance of a string.

     If there is a string, create a new service that simply logs the string.

     */

    NSString *theFirstString;

    for (id item in items) {

        if ([item isKindOfClass:[NSString class]]) {

            theFirstString = item;

            break;

        }

        if ([item isKindOfClass:[NSAttributedString class]]) {

            theFirstString = [(NSAttributedString *)item string];

            break;

        }

    }

    /*

     If there is a string in the array of items, create a new service:

     The service is defined as a handler block; in this case, the block simply uses NSLog to print out the string.

     */

    if (theFirstString) {

        NSSharingService *customService = [[NSSharingService alloc] initWithTitle:@"Log the first string" image:[NSImage imageNamed:@"egg16"] alternateImage:nil handler:^{

            NSLog(@"The first string: %@", theFirstString);

        }];

        services = [services arrayByAddingObject:customService];

    }

    return services;

}

- (id <NSSharingServiceDelegate>)sharingServicePicker:(NSSharingServicePicker *)sharingServicePicker delegateForSharingService:(NSSharingService *)sharingService

{

    /*

     Implementing this method sets the delegate for the sharing service picker created in chooseSharingService:.

     In this example, it's for illustration only -- the delegate method simply logs which service was chosen. In your application, you might want to use the delegate method for something more useful, like managing resources.

     */

    return self;

}

- (void)sharingServicePicker:(NSSharingServicePicker *)sharingServicePicker didChooseSharingService:(NSSharingService *)service

{    

    NSLog(@"Picked this service: %@", service);

}

#pragma mark - Sharing service delegate methods

- (NSRect)sharingService:(NSSharingService *)sharingService sourceFrameOnScreenForShareItem:(id<NSPasteboardWriting>)item

{

    if ([item isKindOfClass:[NSImage class]]) {

        NSImageView *imageView = self.imageView;

        NSRect imageViewBounds = [imageView bounds];

        NSSize imageSize = [[imageView image] size];

        NSRect imageFrame = NSMakeRect((NSWidth(imageViewBounds) - imageSize.width) / 2.0, (NSHeight(imageViewBounds) - imageSize.height) / 2.0, imageSize.width, imageSize.height);

        NSRect frame = [imageView convertRect:imageFrame toView:nil];

        frame.origin = [[imageView window] convertBaseToScreen:frame.origin];

        return frame;

    }

    else {

        return NSZeroRect;

    }

}

- (NSImage *)sharingService:(NSSharingService *)sharingService transitionImageForShareItem:(id<NSPasteboardWriting>)item contentRect:(NSRect *)contentRect

{

    if ([item isKindOfClass:[NSImage class]]) {

        return [self.imageView image];

    }

    else {

        return nil;

    }

}

- (NSWindow *)sharingService:(NSSharingService *)sharingService sourceWindowForShareItems:(NSArray *)items sharingContentScope:(NSSharingContentScope *)sharingContentScope

{

    /*

     The window for all the services is self's window.

     The other methods are useful if you share an item which already has a representation in the window, typically an image. You give its frame and the sharing service animates from it.

     */

    return self.window;

}

#pragma mark - Text view delegate

- (NSSharingServicePicker *)textView:(NSTextView *)textView willShowSharingServicePicker:(NSSharingServicePicker *)servicePicker forItems:(NSArray *)items

{

    /*

     Here you could modify the service picker for the given items.

     */

    NSLog(@"Text view using %@ with items: %@", servicePicker, items);

    return servicePicker;

}

@end