/*

     File: APLWebViewController.m

 Abstract: The view controller for hosting the UIWebView feature of this sample.

  Version: 2.0

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 */

#import "APLWebViewController.h"

#import "APLPrintPageRenderer.h"

@interface APLWebViewController ()

@property (nonatomic, weak) IBOutlet UIWebView *myWebView;

@property (nonatomic, weak) IBOutlet UITextField *urlField;

@property (nonatomic, weak) IBOutlet UIBarButtonItem *printButton;

@end

@implementation APLWebViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

    [self.urlField setAccessibilityLabel:NSLocalizedString(@"URL", @"Accessiblity Label for URL Text Field")];

    [self.myWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:self.urlField.text]]];

    if(![UIPrintInteractionController isPrintingAvailable]){

        self.printButton.enabled = NO;

    }

}

- (void)viewWillAppear:(BOOL)animated

{

    // Set self as the web view's delegate when the view is shown; use the delegate methods to toggle display of the network activity indicator.

    self.myWebView.delegate = self;

}

- (void)viewWillDisappear:(BOOL)animated

{

    [self.myWebView stopLoading];   // In case the web view is still loading its content.

    self.myWebView.delegate = nil;  // Disconnect the delegate as the webview is hidden.

    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation

{

    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {

        return YES;

    }

    else {

        if (toInterfaceOrientation == UIInterfaceOrientationPortraitUpsideDown) {

            return NO;

        }

    }

    return YES;

}

#pragma mark - UIWebViewDelegate

- (void)webViewDidStartLoad:(UIWebView *)webView

{

    // Starting the load, show the activity indicator in the status bar.

    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;

}

- (void)webViewDidFinishLoad:(UIWebView *)webView

{

    // Finished loading, hide the activity indicator in the status bar.

    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;

    NSURL *url = [webView.request URL];

    self.urlField.text = [url absoluteString];

}

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType

{

    NSURL *url = [request URL];

    self.urlField.text = [url absoluteString];

    return YES;

}

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error

{

    // Load error, hide the activity indicator in the status bar.

    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;

    // Report the error inside the webview.

    NSString* errorString = [NSString stringWithFormat:

                            @"<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01//EN\" \"http://www.w3.org/TR/html4/strict.dtd\"><html><head><meta http-equiv='Content-Type' content='text/html;charset=utf-8'><title></title></head><body><div style='width: 100%%; text-align: center; font-size: 36pt; color: red;'>An error occurred:<br>%@</div></body></html>",

                             error.localizedDescription];

    [self.myWebView loadHTMLString:errorString baseURL:nil];

}

#pragma mark - Printing

- (IBAction)printWebPage:(id)sender

{

    UIPrintInteractionController *controller = [UIPrintInteractionController sharedPrintController];

    if(!controller){

        NSLog(@"Couldn't get shared UIPrintInteractionController!");

        return;

    }

    UIPrintInteractionCompletionHandler completionHandler =

    ^(UIPrintInteractionController *printController, BOOL completed, NSError *error) {

        if(!completed && error){

            NSLog(@"FAILED! due to error in domain %@ with error code %u", error.domain, error.code);

        }

    };

    // Obtain a printInfo so that we can set our printing defaults.

    UIPrintInfo *printInfo = [UIPrintInfo printInfo];

    // This application produces General content that contains color.

    printInfo.outputType = UIPrintInfoOutputGeneral;

    // We'll use the URL as the job name.

    printInfo.jobName = [self.urlField text];

    // Set duplex so that it is available if the printer supports it. We are

    // performing portrait printing so we want to duplex along the long edge.

    printInfo.duplex = UIPrintInfoDuplexLongEdge;

    // Use this printInfo for this print job.

    controller.printInfo = printInfo;

    // Be sure the page range controls are present for documents of > 1 page.

    controller.showsPageRange = YES;

    // This code uses a custom UIPrintPageRenderer so that it can draw a header and footer.

    APLPrintPageRenderer *myRenderer = [[APLPrintPageRenderer alloc] init];

    // The APLPrintPageRenderer class provides a jobtitle that it will label each page with.

    myRenderer.jobTitle = printInfo.jobName;

    // To draw the content of each page, a UIViewPrintFormatter is used.

    UIViewPrintFormatter *viewFormatter = [self.myWebView viewPrintFormatter];

#if SIMPLE_LAYOUT

    /*

     For the simple layout we simply set the header and footer height to the height of the

     text box containing the text content, plus some padding.

     To do a layout that takes into account the paper size, we need to do that

     at a point where we know that size. The numberOfPages method of the UIPrintPageRenderer

     gets the paper size and can perform any calculations related to deciding header and

     footer size based on the paper size. We'll do that when we aren't doing the simple

     layout.

     */

    UIFont *font = [UIFont fontWithName:@"Helvetica" size:HEADER_FOOTER_TEXT_HEIGHT];

    CGSize titleSize = [myRenderer.jobTitle sizeWithFont:font];

    myRenderer.headerHeight = myRenderer.footerHeight = titleSize.height + HEADER_FOOTER_MARGIN_PADDING;

#endif

    [myRenderer addPrintFormatter:viewFormatter startingAtPageAtIndex:0];

    // Set our custom renderer as the printPageRenderer for the print job.

    controller.printPageRenderer = myRenderer;

    /*

     The method we use to present the printing UI depends on the type of UI idiom that is currently executing. Once we invoke one of these methods to present the printing UI, our application's direct involvement in printing is complete. Our custom printPageRenderer will have its methods invoked at the appropriate time by UIKit.

     */

    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {

        [controller presentFromBarButtonItem:self.printButton animated:YES completionHandler:completionHandler];  // iPad

    }

    else {

        [controller presentAnimated:YES completionHandler:completionHandler];  // iPhone

    }

}

#pragma - Text field delegate

// When the "Done" button is clicked, dismiss the keyboard and load the URL.

- (BOOL)textFieldShouldReturn:(UITextField *)textField

{

    [textField resignFirstResponder];

    NSString *URLString = [textField text];

    NSString *httpPrefix = @"http://";

    if (![URLString hasPrefix:httpPrefix])

    {

        URLString = [httpPrefix stringByAppendingString:URLString];

    }

    [self.myWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:URLString]]];

    return YES;

}

@end