CredentialsInputController.m

/*
 Credentials input controller
 
 Copyright 2013 Thincast Technologies GmbH, Author: Martin Fleisz
 
 This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
 If a copy of the MPL was not distributed with this file, You can obtain one at
 http://mozilla.org/MPL/2.0/.
 */
 
#import "CredentialsInputController.h"
#import "RDPSession.h"
 
@interface CredentialsInputController ()
- (void)updateScrollViewContentSize;
 
- (UIView *)activeCredentialField;
- (void)setKeyboardOverlap:(CGFloat)overlap notification:(NSNotification *)notification;
@end
 
@implementation CredentialsInputController
 
- (id)initWithNibName:(NSString *)nibNameOrNil
               bundle:(NSBundle *)nibBundleOrNil
              session:(RDPSession *)session
               params:(NSMutableDictionary *)params
{
  self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
  if (self)
  {
    _session = session;
    _params = params;
    [self setModalPresentationStyle:UIModalPresentationFormSheet];
 
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillShow:)
                                                 name:UIKeyboardWillShowNotification
                                               object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillHide:)
                                                 name:UIKeyboardWillHideNotification
                                               object:nil];
  }
  return self;
}
 
- (void)viewDidLoad
{
  [super viewDidLoad];
 
  // set localized strings
  [_lbl_message
      setText:NSLocalizedString(
                  @"Please provide the missing user information in order to proceed and login.",
                  @"Credentials input view message")];
  [_textfield_username
      setPlaceholder:NSLocalizedString(@"Username", @"Credentials Input Username hint")];
  [_textfield_password
      setPlaceholder:NSLocalizedString(@"Password", @"Credentials Input Password hint")];
  [_textfield_domain
      setPlaceholder:NSLocalizedString(@"Domain", @"Credentials Input Domain hint")];
  [_btn_login setTitle:NSLocalizedString(@"Login", @"Login Button")
              forState:UIControlStateNormal];
  [_btn_cancel setTitle:NSLocalizedString(@"Cancel", @"Cancel Button")
               forState:UIControlStateNormal];
 
  [_scroll_view setKeyboardDismissMode:UIScrollViewKeyboardDismissModeInteractive];
  [self updateScrollViewContentSize];
 
  // set params in the view
  [_textfield_username setText:[_params valueForKey:@"username"]];
  [_textfield_password setText:[_params valueForKey:@"password"]];
  [_textfield_domain setText:[_params valueForKey:@"domain"]];
}
 
- (void)viewDidLayoutSubviews
{
  [super viewDidLayoutSubviews];
  [self updateScrollViewContentSize];
}
 
- (void)viewDidUnload
{
  [super viewDidUnload];
}
 
- (void)viewDidDisappear:(BOOL)animated
{
  [super viewDidDisappear:animated];
  // set signal
  [[_session uiRequestCompleted] signal];
}
 
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
  return YES;
}
 
- (void)dealloc
{
  [[NSNotificationCenter defaultCenter] removeObserver:self];
  [super dealloc];
}
 
#pragma mark -
#pragma mark iOS Keyboard Notification Handlers
 
- (void)keyboardWillShow:(NSNotification *)notification
{
  CGRect keyboardScreenFrame =
      [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
  CGRect keyboardViewFrame = [[self view] convertRect:keyboardScreenFrame fromView:nil];
  CGRect overlapRect = CGRectIntersection([[self view] bounds], keyboardViewFrame);
  CGFloat overlap = CGRectIsNull(overlapRect) ? 0.0f : CGRectGetHeight(overlapRect);
  [self setKeyboardOverlap:overlap notification:notification];
}
 
- (void)keyboardWillHide:(NSNotification *)notification
{
  [self setKeyboardOverlap:0.0f notification:notification];
}
 
- (void)updateScrollViewContentSize
{
  CGFloat contentBottom = 0.0f;
  for (UIView *subview in [_scroll_view subviews])
    contentBottom = MAX(contentBottom, CGRectGetMaxY([subview frame]));
 
  CGSize contentSize = [_scroll_view bounds].size;
  contentSize.height = MAX(contentSize.height, contentBottom + 20.0f);
  [_scroll_view setContentSize:contentSize];
}
 
- (UIView *)activeCredentialField
{
  if ([_textfield_username isFirstResponder])
    return _textfield_username;
  if ([_textfield_password isFirstResponder])
    return _textfield_password;
  if ([_textfield_domain isFirstResponder])
    return _textfield_domain;
  return nil;
}
 
- (void)setKeyboardOverlap:(CGFloat)overlap notification:(NSNotification *)notification
{
  NSTimeInterval duration =
      [[[notification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
  UIViewAnimationCurve curve = (UIViewAnimationCurve)[
      [[notification userInfo] objectForKey:UIKeyboardAnimationCurveUserInfoKey] integerValue];
  UIViewAnimationOptions options =
      UIViewAnimationOptionBeginFromCurrentState | (UIViewAnimationOptions)(curve << 16);
 
  [UIView animateWithDuration:duration
                        delay:0.0
                      options:options
                   animations:^{
                     UIEdgeInsets insets = [_scroll_view contentInset];
                     insets.bottom = overlap;
                     [_scroll_view setContentInset:insets];
                     [_scroll_view setScrollIndicatorInsets:insets];
 
                     UIView *activeField = [self activeCredentialField];
                     if (activeField)
                     {
                       CGRect visibleRect = [activeField convertRect:[activeField bounds]
                                                              toView:_scroll_view];
                       visibleRect = CGRectInset(visibleRect, -12.0f, -16.0f);
                       [_scroll_view scrollRectToVisible:visibleRect animated:NO];
                     }
                   }
                   completion:nil];
}
 
#pragma mark - Action handlers
 
- (IBAction)loginPressed:(id)sender
{
  // read input back in
  [_params setValue:[_textfield_username text] forKey:@"username"];
  [_params setValue:[_textfield_password text] forKey:@"password"];
  [_params setValue:[_textfield_domain text] forKey:@"domain"];
  [_params setValue:[NSNumber numberWithBool:YES] forKey:@"result"];
 
  // dismiss controller
  [self dismissModalViewControllerAnimated:YES];
}
 
- (IBAction)cancelPressed:(id)sender
{
  [_params setValue:[NSNumber numberWithBool:NO] forKey:@"result"];
 
  // dismiss controller
  [self dismissModalViewControllerAnimated:YES];
}
 
@end