RDPSessionViewController.m

/*
 RDP Session View 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 <QuartzCore/QuartzCore.h>
#import <GameController/GameController.h>
#import <objc/runtime.h>
#import "RDPSessionViewController.h"
#import "RDPSessionToolbar.h"
#import "RDPOverlayStyle.h"
#import "RDPKeyboard.h"
#import "Utils.h"
#import "Toast+UIView.h"
#import "ConnectionParams.h"
 
#define TOOLBAR_HEIGHT 44
#define KEYBOARD_CURSOR_MARGIN 44.0
 
@interface RDPSessionViewController (Private)
- (void)showSessionToolbar:(BOOL)show;
- (void)initGestureRecognizers;
- (void)suspendSession;
- (void)fitSessionViewToViewport;
- (void)centerSessionViewInViewport;
- (void)setKeyboardOverlap:(CGFloat)overlap;
- (CGRect)sessionViewportFrame;
- (void)showConnectingViewWithText:(NSString *)text;
- (void)hideConnectingView;
- (void)endBackgroundTask;
- (CGPoint)remotePositionForSessionViewPosition:(CGPoint)position;
- (CGPoint)sessionViewPositionForRemotePosition:(CGPoint)position;
- (CGPoint)clampedSessionViewCursorPosition:(CGPoint)position;
- (NSDictionary *)eventDescriptorForMouseEvent:(int)event position:(CGPoint)position;
- (void)handleMouseMoveForPosition:(CGPoint)position;
- (CGPoint)currentCursorViewPosition;
- (void)moveCursorByViewportDelta:(CGPoint)delta;
- (void)moveCursorToSessionViewPosition:(CGPoint)position;
- (void)sendMouseButtonEvent:(int)event;
- (BOOL)isKeyboardActive;
- (BOOL)isLandscape;
- (CGFloat)advancedKeyboardHeight;
- (void)resetTextInput;
- (void)commitTextInput;
@end
 
// dummy text field
@interface RDPSessionTextField : UITextField
@end
 
@implementation RDPSessionTextField
 
- (void)deleteBackward
{
  // send backspace to remote session if dummy text field is empty.
  if ([[self text] length] == 0)
    [[RDPKeyboard getSharedRDPKeyboard] sendBackspaceKeyStroke];
  [super deleteBackward];
}
 
@end
 
@implementation RDPSessionViewController
 
#pragma mark class methods
 
- (id)initWithNibName:(NSString *)nibNameOrNil
               bundle:(NSBundle *)nibBundleOrNil
              session:(RDPSession *)session
{
  self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
  if (self)
  {
    _session = [session retain];
    [_session setDelegate:self];
    _session_initilized = NO;
 
    _advanced_keyboard_view = nil;
    _sent_text = [@"" retain];
    _last_session_viewport_size = CGSizeZero;
 
    _session_toolbar_visible = NO;
 
    _cursor_view_position = CGPointZero;
    _last_mouse_pan_location = CGPointZero;
    _has_cursor_view_position = NO;
    _has_user_moved_cursor = NO;
    _mouse_pan_active = NO;
    _long_press_active = NO;
    _mouse_drag_active = NO;
    _pointer_is_indirect = NO;
  }
 
  return self;
}
 
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView
{
  // load default view and set background color and resizing mask
  [super loadView];
 
  // let pointer input pass through the session toolbar to the remote session
  object_setClass(_session_toolbar, [RDPSessionToolbar class]);
  [(RDPSessionToolbar *)_session_toolbar setPassthroughView:_session_scrollview];
  if (RDPSupportLiquidGlass() == NO)
  {
    // before ios 26, the gray background has been displayed in toolbar
    UIToolbarAppearance *appearance = [[[UIToolbarAppearance alloc] init] autorelease];
 
    // set transparent background
    [appearance configureWithTransparentBackground];
    [_session_toolbar setStandardAppearance:appearance];
    [_session_toolbar setCompactAppearance:appearance];
    [_session_toolbar setScrollEdgeAppearance:appearance];
    [_session_toolbar setCompactScrollEdgeAppearance:appearance];
  }
 
  // init keyboard toolbar
  _keyboard_toolbar = [[RDPKeyboardToolbarView alloc] initWithTarget:self];
  [_dummy_textfield setInputAccessoryView:_keyboard_toolbar];
 
  // the text field must not alter when typed
  [_dummy_textfield setAutocapitalizationType:UITextAutocapitalizationTypeNone];
  [_dummy_textfield setSpellCheckingType:UITextSpellCheckingTypeNo];
  [_dummy_textfield setSmartQuotesType:UITextSmartQuotesTypeNo];
  [_dummy_textfield setSmartDashesType:UITextSmartDashesTypeNo];
  [_dummy_textfield setSmartInsertDeleteType:UITextSmartInsertDeleteTypeNo];
  [_dummy_textfield addTarget:self
                       action:@selector(textInputChanged:)
             forControlEvents:UIControlEventEditingChanged];
 
  // the undo/redo/paste shortcuts of the iPad keyboard act on the hidden text field, not on
  // the remote session, so don't show them
  [[_dummy_textfield inputAssistantItem] setLeadingBarButtonGroups:@[]];
  [[_dummy_textfield inputAssistantItem] setTrailingBarButtonGroups:@[]];
 
  // init gesture recognizers
  [self initGestureRecognizers];
 
  // hide session toolbar
  [_session_toolbar
      setFrame:CGRectMake(0.0, -TOOLBAR_HEIGHT, [[self view] bounds].size.width, TOOLBAR_HEIGHT)];
}
 
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
  [super viewDidLoad];
 
  // shown around the session when it avoids the screen edges
  [[self view] setBackgroundColor:[UIColor blackColor]];
 
  [_session_scrollview setContentInsetAdjustmentBehavior:UIScrollViewContentInsetAdjustmentNever];
  [_session_scrollview setContentInset:UIEdgeInsetsZero];
  [_session_scrollview setScrollIndicatorInsets:UIEdgeInsetsZero];
  [_session_scrollview setShowsHorizontalScrollIndicator:NO];
  [_session_scrollview setShowsVerticalScrollIndicator:NO];
  [_session_scrollview setAlwaysBounceHorizontal:NO];
  [_session_scrollview setAlwaysBounceVertical:NO];
  [_session_scrollview setBounces:NO];
}
 
- (void)viewDidLayoutSubviews
{
  [super viewDidLayoutSubviews];
 
  CGRect viewportFrame = [self sessionViewportFrame];
  [_session_scrollview setFrame:viewportFrame];
 
  CGSize viewportSize = [_session_scrollview bounds].size;
  if (!CGSizeEqualToSize(viewportSize, _last_session_viewport_size))
    [self fitSessionViewToViewport];
  else
    [self centerSessionViewInViewport];
}
 
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
  return YES;
}
 
- (BOOL)prefersStatusBarHidden
{
  return YES;
}
 
- (UIStatusBarAnimation)preferredStatusBarUpdateAnimation
{
  return UIStatusBarAnimationSlide;
}
 
- (void)viewWillTransitionToSize:(CGSize)size
       withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
{
  [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
 
  // the system keyboard changes its height with the orientation, so follow it
  [coordinator
      animateAlongsideTransition:nil
                      completion:^(id<UIViewControllerTransitionCoordinatorContext> context) {
                        if (!_advanced_keyboard_view)
                          return;
                        CGRect frame = [_advanced_keyboard_view frame];
                        frame.size.height = [self advancedKeyboardHeight];
                        [_advanced_keyboard_view setFrame:frame];
                        [_dummy_textfield reloadInputViews];
                      }];
}
 
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
  (void)fromInterfaceOrientation;
  [self centerSessionViewInViewport];
}
 
- (void)didReceiveMemoryWarning
{
  // Releases the view if it doesn't have a superview.
  [super didReceiveMemoryWarning];
 
  // Release any cached data, images, etc. that aren't in use.
}
 
- (void)viewDidUnload
{
  [super viewDidUnload];
  // Release any retained subviews of the main view.
  // e.g. self.myOutlet = nil;
}
 
- (void)viewWillAppear:(BOOL)animated
{
  [super viewWillAppear:animated];
 
  // remote screen always fit in device screen
  [self setNeedsStatusBarAppearanceUpdate];
  [[self navigationController] setNeedsStatusBarAppearanceUpdate];
  [[self navigationController] setNavigationBarHidden:YES animated:animated];
  if (@available(iOS 18.0, *))
    [[self tabBarController] setTabBarHidden:YES animated:animated];
  else
    [[[self tabBarController] tabBar] setHidden:YES];
 
  // if session is suspended - notify that we got a new bitmap context
  if ([_session isSuspended])
    [self sessionBitmapContextWillChange:_session];
 
  // init keyboard
  [[RDPKeyboard getSharedRDPKeyboard] initWithSession:_session delegate:self];
}
 
- (void)viewDidAppear:(BOOL)animated
{
  [super viewDidAppear:animated];
 
  if (!_session_initilized)
  {
    if ([_session isSuspended])
    {
      [_session resume];
      [self sessionBitmapContextDidChange:_session];
    }
    else
      [_session connect];
 
    _session_initilized = YES;
  }
}
 
- (void)viewWillDisappear:(BOOL)animated
{
  [super viewWillDisappear:animated];
  if (_mouse_drag_active)
    [self sendMouseButtonEvent:GetLeftMouseButtonClickEvent(NO)];
  _mouse_drag_active = NO;
  _mouse_pan_active = NO;
  _long_press_active = NO;
 
  [[self navigationController] setNeedsStatusBarAppearanceUpdate];
  [[self navigationController] setNavigationBarHidden:NO animated:animated];
  if (@available(iOS 18.0, *))
    [[self tabBarController] setTabBarHidden:NO animated:animated];
  else
    [[[self tabBarController] tabBar] setHidden:NO];
 
  // reset all modifier keys on rdp keyboard
  [[RDPKeyboard getSharedRDPKeyboard] reset];
 
  // hide toolbar and keyboard
  [self showSessionToolbar:NO];
  [_dummy_textfield resignFirstResponder];
}
 
- (void)dealloc
{
  // remove any observers
  [[NSNotificationCenter defaultCenter] removeObserver:self];
 
  // the session lives on longer so set the delegate to nil
  [_session setDelegate:nil];
 
  [_advanced_keyboard_view release];
  [_keyboard_toolbar release];
  [_sent_text release];
  [_session release];
  [super dealloc];
}
 
#pragma mark -
#pragma mark ScrollView delegate methods
 
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
  return _session_view;
}
 
- (void)scrollViewDidZoom:(UIScrollView *)scrollView
{
  [self centerSessionViewInViewport];
}
 
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView
                       withView:(UIView *)view
                        atScale:(CGFloat)scale
{
  NSLog(@"New zoom scale: %f", scale);
  [self centerSessionViewInViewport];
  [_session_view setNeedsDisplayInRemoteRect:[_session_view bounds]];
}
 
#pragma mark -
#pragma mark TextField delegate methods
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
  return YES;
}
 
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField
{
  [self destroyAdvancedKeyboard];
  return YES;
}
 
- (void)textFieldDidEndEditing:(UITextField *)textField
{
  [self commitTextInput];
}
 
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
  [self commitTextInput];
  [[RDPKeyboard getSharedRDPKeyboard] sendEnterKeyStroke];
 
  // turn off default action
  return NO;
}
 
// sends what changed in the text field since the last time
- (void)textInputChanged:(UITextField *)textField
{
  // send marked text (chinese, japanese) only once committed, sending every change
  // arrives out of order on the server
  if ([textField markedTextRange] != nil)
    return;
 
  // a letter typed with a toolbar modifier is a shortcut (e.g. ctrl+a). read it before
  // sending, which releases the modifiers
  RDPKeyboard *keyboard = [RDPKeyboard getSharedRDPKeyboard];
  BOOL modifierPressed = [keyboard ctrlPressed] || [keyboard altPressed] ||
                         [keyboard winPressed] || [keyboard altGrPressed];
 
  NSString *text = [textField text] != nil ? [textField text] : @"";
  NSUInteger length = MIN([text length], [_sent_text length]);
  NSUInteger common = 0;
 
  while (common < length)
  {
    if ([text characterAtIndex:common] != [_sent_text characterAtIndex:common])
    {
      break;
    }
    common++;
  }
 
  // don't split a multi code point character (e.g. emoji)
  if (common < [_sent_text length])
    common = MIN(common, [_sent_text rangeOfComposedCharacterSequenceAtIndex:common].location);
  if (common < [text length])
    common = MIN(common, [text rangeOfComposedCharacterSequenceAtIndex:common].location);
 
  for (NSUInteger i = common; i < [_sent_text length];)
  {
    NSRange range = [_sent_text rangeOfComposedCharacterSequenceAtIndex:i];
    [keyboard sendBackspaceKeyStroke];
    i = NSMaxRange(range);
  }
 
  for (NSUInteger i = common; i < [text length]; i++)
  {
    [keyboard sendUnicode:[text characterAtIndex:i]];
  }
 
  BOOL isLastCharLetter = NO;
  if ([text length] > 0)
  {
    isLastCharLetter = [[NSCharacterSet letterCharacterSet]
        characterIsMember:[text characterAtIndex:[text length] - 1]];
  }
 
  // some keyboard (korean) composes with the letters before the cursor
  // keep it
  if (modifierPressed || !isLastCharLetter)
  {
    [self resetTextInput];
  }
  else
  {
    [_sent_text release];
    _sent_text = [text copy];
  }
}
 
#pragma mark -
#pragma mark AdvancedKeyboardDelegate functions
- (void)advancedKeyPressedVKey:(NSInteger)key
{
  [self commitTextInput];
  [[RDPKeyboard getSharedRDPKeyboard] sendVirtualKeyCode:key];
}
 
#pragma mark - RDP keyboard handler
 
- (void)modifiersChangedForKeyboard:(RDPKeyboard *)keyboard
{
  [_keyboard_toolbar updateModifiersWithKeyboard:keyboard];
}
 
#pragma mark -
#pragma mark RDPSessionDelegate functions
 
- (void)session:(RDPSession *)session didFailToConnect:(int)reason
{
  [self hideConnectingView];
 
  // return to bookmark list
  [[self navigationController] popViewControllerAnimated:YES];
}
 
- (void)sessionWillConnect:(RDPSession *)session
{
  [self showConnectingViewWithText:NSLocalizedString(@"Connecting",
                                                     @"Connecting progress view - label")];
}
 
- (void)sessionWillReconnect:(RDPSession *)session
{
  (void)session;
  [self showConnectingViewWithText:NSLocalizedString(
                                       @"Reconnecting",
                                       @"Connecting progress view - reconnect label")];
}
 
- (void)sessionDidReconnect:(RDPSession *)session
{
  (void)session;
  [self hideConnectingView];
}
 
- (void)sessionDidConnect:(RDPSession *)session
{
  // register keyboard notification handlers
  [[NSNotificationCenter defaultCenter] addObserver:self
                                           selector:@selector(keyboardWillShow:)
                                               name:UIKeyboardWillShowNotification
                                             object:nil];
  [[NSNotificationCenter defaultCenter] addObserver:self
                                           selector:@selector(keyboardWillHide:)
                                               name:UIKeyboardWillHideNotification
                                             object:nil];
  [[NSNotificationCenter defaultCenter] addObserver:self
                                           selector:@selector(keyboardDidHide:)
                                               name:UIKeyboardDidHideNotification
                                             object:nil];
 
  // register hardware keyboard connection handlers (for ipad magic keyboard)
  [[NSNotificationCenter defaultCenter] addObserver:self
                                           selector:@selector(hardwareKeyboardChanged:)
                                               name:GCKeyboardDidConnectNotification
                                             object:nil];
  [[NSNotificationCenter defaultCenter] addObserver:self
                                           selector:@selector(hardwareKeyboardChanged:)
                                               name:GCKeyboardDidDisconnectNotification
                                             object:nil];
  [self hardwareKeyboardChanged:nil];
 
  // another app may have changed the clipboard while this one was inactive
  [[NSNotificationCenter defaultCenter] addObserver:self
                                           selector:@selector(localClipboardChanged:)
                                               name:UIApplicationDidBecomeActiveNotification
                                             object:nil];
  [self localClipboardChanged:nil];
 
  // ios can suspends the app soon after it switched to the background and may then take its
  // socket away
  [[NSNotificationCenter defaultCenter] addObserver:self
                                           selector:@selector(applicationDidEnterBackground:)
                                               name:UIApplicationDidEnterBackgroundNotification
                                             object:nil];
  [[NSNotificationCenter defaultCenter] addObserver:self
                                           selector:@selector(applicationWillEnterForeground:)
                                               name:UIApplicationWillEnterForegroundNotification
                                             object:nil];
 
  [self hideConnectingView];
 
  // check if session settings changed ...
  // The 2nd width check is to ignore changes in resolution settings due to the RDVH display bug
  // (refer to RDPSEssion.m for more details)
  ConnectionParams *orig_params = [session params];
  rdpSettings *sess_params = [session getSessionParams];
  const UINT32 width = freerdp_settings_get_uint32(sess_params, FreeRDP_DesktopWidth);
  const UINT32 height = freerdp_settings_get_uint32(sess_params, FreeRDP_DesktopHeight);
  const UINT32 depth = freerdp_settings_get_uint32(sess_params, FreeRDP_ColorDepth);
 
  if (([orig_params intForKey:@"width"] != width &&
       [orig_params intForKey:@"width"] != (width + 1ul)) ||
      [orig_params intForKey:@"height"] != height || [orig_params intForKey:@"colors"] != depth)
  {
    // display notification that the session params have been changed by the server
    NSString *message =
        [NSString stringWithFormat:NSLocalizedString(
                                       @"The server changed the screen settings to %dx%dx%d",
                                       @"Screen settings not supported message with width, "
                                       @"height and colors parameter"),
                                   width, height, depth];
    [[self view] makeToast:message duration:ToastDurationNormal position:@"bottom"];
  }
}
 
- (void)sessionWillDisconnect:(RDPSession *)session
{
}
 
- (void)sessionDidDisconnect:(RDPSession *)session
{
  [self hideConnectingView];
  [self endBackgroundTask];
 
  // return to bookmark list
  [[self navigationController] popViewControllerAnimated:YES];
}
 
- (void)sessionBitmapContextWillChange:(RDPSession *)session
{
  [_session_view prepareForBitmapContextChange];
 
  // calc new view frame
  rdpSettings *sess_params = [session getSessionParams];
  CGRect view_rect =
      CGRectMake(0, 0, freerdp_settings_get_uint32(sess_params, FreeRDP_DesktopWidth),
                 freerdp_settings_get_uint32(sess_params, FreeRDP_DesktopHeight));
 
  // set session view to its native (remote) size and update content size
  [_session_scrollview setZoomScale:1.0];
  [_session_view setFrame:view_rect];
  [_session_scrollview setContentSize:view_rect.size];
  _has_cursor_view_position = NO;
  _has_user_moved_cursor = NO;
  _last_session_viewport_size = CGSizeZero;
  [self fitSessionViewToViewport];
 
  // show toolbar
  [_session setToolbarVisible:YES];
  [self showSessionToolbar:[_session toolbarVisible]];
}
 
- (void)sessionBitmapContextDidChange:(RDPSession *)session
{
  // associate view with session
  [_session_view setSession:session];
  [_session_view setDefaultRemoteCursor];
  if (!_has_cursor_view_position)
    (void)[self currentCursorViewPosition];
 
  // Upload the new desktop once; subsequent EndPaint callbacks update only dirty regions.
  [_session_view setNeedsDisplayInRemoteRect:[_session_view bounds]];
}
 
- (void)session:(RDPSession *)session needsRedrawInRect:(CGRect)rect
{
  [_session_view setNeedsDisplayInRemoteRect:rect];
}
 
- (void)session:(RDPSession *)session didSetRemoteCursor:(RDPCursor *)cursor
{
  (void)session;
  [_session_view setRemoteCursor:cursor];
 
  if (!_has_user_moved_cursor &&
      (!_has_cursor_view_position || CGPointEqualToPoint(_cursor_view_position, CGPointZero)))
  {
    _has_cursor_view_position = NO;
    (void)[self currentCursorViewPosition];
  }
}
 
- (void)session:(RDPSession *)session didMoveRemoteCursor:(CGPoint)position
{
  (void)session;
  if (_mouse_pan_active || _long_press_active)
    return;
  CGPoint viewPosition = [self sessionViewPositionForRemotePosition:position];
  if (!_has_user_moved_cursor && CGPointEqualToPoint(position, CGPointZero) &&
      _has_cursor_view_position && !CGPointEqualToPoint(_cursor_view_position, CGPointZero))
    return;
 
  _cursor_view_position = viewPosition;
  _has_cursor_view_position = YES;
  [_session_view setRemoteCursorPosition:viewPosition];
}
 
- (void)sessionDidHideRemoteCursor:(RDPSession *)session
{
  (void)session;
  [_session_view hideRemoteCursor];
}
 
- (void)sessionDidSetDefaultRemoteCursor:(RDPSession *)session
{
  (void)session;
  [_session_view setDefaultRemoteCursor];
}
 
- (void)session:(RDPSession *)session didChangeRemoteClipboardText:(NSString *)text
{
  (void)session;
  UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
  [pasteboard setString:text];
 
  // don't announce the server's own text back to it
  _pasteboard_change_count = [pasteboard changeCount];
}
 
- (void)session:(RDPSession *)session requestsClipboardTextWithParams:(NSMutableDictionary *)params
{
  (void)session;
  NSString *text = [[UIPasteboard generalPasteboard] string];
  if (text)
    [params setObject:text forKey:@"text"];
}
 
- (void)session:(RDPSession *)session requestsAuthenticationWithParams:(NSMutableDictionary *)params
{
  // custom view --> stock UIAlertController
  __block UIAlertController *alert = [UIAlertController
      alertControllerWithTitle:NSLocalizedString(@"Credentials", @"Credentials title")
                       message:NSLocalizedString(@"Please provide the missing user information.",
                                                 @"Credentials input view message")
                preferredStyle:UIAlertControllerStyleAlert];
 
  // username input field
  [alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
    [textField
        setPlaceholder:NSLocalizedString(@"Username", @"Credentials Input Username hint")];
    [textField setText:[params valueForKey:@"username"]];
    [textField setAutocapitalizationType:UITextAutocapitalizationTypeNone];
    [textField setAutocorrectionType:UITextAutocorrectionTypeNo];
  }];
 
  // password input field
  [alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
    [textField
        setPlaceholder:NSLocalizedString(@"Password", @"Credentials Input Password hint")];
    [textField setText:[params valueForKey:@"password"]];
    [textField setSecureTextEntry:YES];
  }];
 
  // domain input field
  [alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
    [textField setPlaceholder:NSLocalizedString(@"Domain", @"Credentials Input Domain hint")];
    [textField setText:[params valueForKey:@"domain"]];
    [textField setAutocapitalizationType:UITextAutocapitalizationTypeNone];
    [textField setAutocorrectionType:UITextAutocorrectionTypeNo];
  }];
 
  // cancel btn
  UIAlertAction *cancelAction =
      [UIAlertAction actionWithTitle:NSLocalizedString(@"Cancel", @"Cancel Button")
                               style:UIAlertActionStyleCancel
                             handler:^(UIAlertAction *action) {
                               [params setValue:[NSNumber numberWithBool:NO] forKey:@"result"];
                               [[session uiRequestCompleted] signal];
                             }];
  [alert addAction:cancelAction];
 
  // login btn
  UIAlertAction *loginAction = [UIAlertAction
      actionWithTitle:NSLocalizedString(@"Login", @"Login Button")
                style:UIAlertActionStyleDefault
              handler:^(UIAlertAction *action) {
                NSArray *fields = [alert textFields];
                [params setValue:[[fields objectAtIndex:0] text] forKey:@"username"];
                [params setValue:[[fields objectAtIndex:1] text] forKey:@"password"];
                [params setValue:[[fields objectAtIndex:2] text] forKey:@"domain"];
                [params setValue:[NSNumber numberWithBool:YES] forKey:@"result"];
                [[session uiRequestCompleted] signal];
              }];
  [alert addAction:loginAction];
 
  [alert setPreferredAction:loginAction];
 
  [self presentViewController:alert animated:YES completion:nil];
}
 
- (void)session:(RDPSession *)session verifyCertificateWithParams:(NSMutableDictionary *)params
{
  NSString *message = [NSString
      stringWithFormat:@"%@\n\n%@ %@",
                       NSLocalizedString(@"The identity of the remote computer cannot be "
                                         @"verified. Do you want to connect anyway?",
                                         @"Verify certificate view message"),
                       NSLocalizedString(@"Issuer:", @"Verify certificate view issuer label"),
                       [params valueForKey:@"issuer"]];
  UIAlertController *alert =
      [UIAlertController alertControllerWithTitle:nil
                                          message:message
                                   preferredStyle:UIAlertControllerStyleAlert];
 
  [alert addAction:[UIAlertAction actionWithTitle:NSLocalizedString(@"No", @"No Button")
                                            style:UIAlertActionStyleCancel
                                          handler:^(UIAlertAction *action) {
                                            [params setValue:[NSNumber numberWithBool:NO]
                                                      forKey:@"result"];
                                            [[session uiRequestCompleted] signal];
                                          }]];
 
  [alert addAction:[UIAlertAction actionWithTitle:NSLocalizedString(@"Yes", @"Yes Button")
                                            style:UIAlertActionStyleDefault
                                          handler:^(UIAlertAction *action) {
                                            [params setValue:[NSNumber numberWithBool:YES]
                                                      forKey:@"result"];
                                            [[session uiRequestCompleted] signal];
                                          }]];
 
  [self presentViewController:alert animated:YES completion:nil];
}
 
- (CGSize)sizeForFitScreenForSession:(RDPSession *)session
{
  // set remote resolution that matches the on-screen viewport.
  CGSize size = [self sessionViewportFrame].size;
  UIScreen *screen = [[self view] window] ? [[[self view] window] screen] : [UIScreen mainScreen];
  CGFloat scale =
      [screen respondsToSelector:@selector(nativeScale)] ? [screen nativeScale] : [screen scale];
  if (scale <= 0.0f)
    scale = 1.0f;
 
  size.width = ceilf(size.width * scale);
  size.height = ceilf(size.height * scale);
 
  CGFloat maxDimension = MAX(size.width, size.height);
  if (maxDimension > 4096.0f)
  {
    CGFloat downscale = 4096.0f / maxDimension;
    size.width = floorf(size.width * downscale);
    size.height = floorf(size.height * downscale);
  }
 
  size.width = MAX(64.0f, size.width);
  size.height = MAX(64.0f, size.height);
  return size;
}
 
#pragma mark - Keyboard Toolbar Handlers
 
- (void)showAdvancedKeyboardAnimated
{
  // already advanced keyboard activated
  if (_advanced_keyboard_view)
    return;
 
  CGRect rect = CGRectMake(0, 0, [[self view] bounds].size.width, [self advancedKeyboardHeight]);
  _advanced_keyboard_view = [[AdvancedKeyboardView alloc] initWithFrame:rect delegate:self];
 
  [_dummy_textfield setInputView:_advanced_keyboard_view];
  [_dummy_textfield reloadInputViews];
  [_keyboard_toolbar setExtendedKeyboardActive:YES];
}
 
- (void)destroyAdvancedKeyboard
{
  // advanced keyboard not activated
  if (!_advanced_keyboard_view)
    return;
 
  [_dummy_textfield setInputView:nil];
  [_advanced_keyboard_view autorelease];
  _advanced_keyboard_view = nil;
  [_keyboard_toolbar setExtendedKeyboardActive:NO];
}
 
// toggle advanced keyboard (not keyboard)
- (IBAction)toggleKeyboardWhenOtherVisible:(id)sender
{
  if (!_advanced_keyboard_view)
  {
    // show advanced keyboard
    [self showAdvancedKeyboardAnimated];
  }
  else
  {
    // close advanced keyboard
    [self destroyAdvancedKeyboard];
    [_dummy_textfield reloadInputViews];
  }
}
 
- (IBAction)toggleWinKey:(id)sender
{
  [[RDPKeyboard getSharedRDPKeyboard] toggleWinKey];
}
 
- (IBAction)toggleShiftKey:(id)sender
{
  [[RDPKeyboard getSharedRDPKeyboard] toggleShiftKey];
}
 
- (IBAction)toggleCtrlKey:(id)sender
{
  [[RDPKeyboard getSharedRDPKeyboard] toggleCtrlKey];
}
 
- (IBAction)toggleAltKey:(id)sender
{
  [[RDPKeyboard getSharedRDPKeyboard] toggleAltKey];
}
 
- (IBAction)toggleAltGrKey:(id)sender
{
  [[RDPKeyboard getSharedRDPKeyboard] toggleAltGrKey];
}
 
- (IBAction)pressEscKey:(id)sender
{
  [self commitTextInput];
  [[RDPKeyboard getSharedRDPKeyboard] sendEscapeKeyStroke];
}
 
- (IBAction)pressDeleteKey:(id)sender
{
  [self commitTextInput];
  [[RDPKeyboard getSharedRDPKeyboard] sendDeleteKeyStroke];
}
 
- (IBAction)pressTabKey:(id)sender
{
  [self commitTextInput];
  [[RDPKeyboard getSharedRDPKeyboard] sendTabKeyStroke];
}
 
#pragma mark -
#pragma mark event handlers
 
- (IBAction)switchSession:(id)sender
{
  [self suspendSession];
}
 
- (IBAction)toggleKeyboard:(id)sender
{
  if (![self isKeyboardActive])
    [_dummy_textfield becomeFirstResponder];
  else
    [_dummy_textfield resignFirstResponder];
}
 
- (IBAction)disconnectSession:(id)sender
{
  [_session disconnect];
}
 
- (IBAction)cancelButtonPressed:(id)sender
{
  [_session disconnect];
}
 
#pragma mark -
#pragma mark iOS Keyboard Notification Handlers
 
- (void)keyboardWillShow:(NSNotification *)notification
{
  // remember the system keyboard's height (to show advanced keyboard view)
  if (!_advanced_keyboard_view)
  {
    CGRect frame =
        [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGFloat height = frame.size.height - [_keyboard_toolbar bounds].size.height;
 
    // 100.0 is heuristic value.
    if (height >= 100.0)
    {
      if ([self isLandscape])
        _keyboard_height_landscape = height;
      else
        _keyboard_height_portrait = height;
    }
  }
 
  [self centerSessionViewInViewport];
 
  // get covered area (keyboard)
  CGRect keyboardFrame =
      [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
  keyboardFrame = [[self view] convertRect:keyboardFrame fromView:nil];
 
  CGRect coveredArea = CGRectIntersection([_session_scrollview frame], keyboardFrame);
 
  [self setKeyboardOverlap:CGRectGetHeight(coveredArea)];
}
 
- (void)keyboardWillHide:(NSNotification *)notification
{
  (void)notification;
  [self centerSessionViewInViewport];
  [self setKeyboardOverlap:0.0];
}
 
- (void)keyboardDidHide:(NSNotification *)notification
{
  // release adanced keyboard view
  if (![self isKeyboardActive])
    [self destroyAdvancedKeyboard];
 
  // resume capturing the hardware keyboard once the on-screen keyboard is gone
  if (![self isKeyboardActive] && [_session_view hardwareKeyboardActive])
    [_session_view becomeFirstResponder];
}
 
- (void)hardwareKeyboardChanged:(NSNotification *)notification
{
  BOOL connected = (GCKeyboard.coalescedKeyboard != nil);
  [_session_view setHardwareKeyboardActive:connected];
 
  if (connected && ![self isKeyboardActive])
    [_session_view becomeFirstResponder];
  else if (!connected)
    [_session_view resignFirstResponder];
}
 
- (void)localClipboardChanged:(NSNotification *)notification
{
  // hasStrings does not show the paste permission alert, unlike reading the string
  UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
  if ([pasteboard changeCount] == _pasteboard_change_count)
    return;
 
  _pasteboard_change_count = [pasteboard changeCount];
  [_session sendClipboardHasText:[pasteboard hasStrings]];
}
 
- (void)applicationDidEnterBackground:(NSNotification *)notification
{
  // keeps the connection alive for a short visit to another app
  // after a longer one the session will reconnect
  [self endBackgroundTask];
  _background_task =
      [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
        [self endBackgroundTask];
      }];
}
 
- (void)applicationWillEnterForeground:(NSNotification *)notification
{
  [self endBackgroundTask];
}
 
#pragma mark -
#pragma mark Gesture handlers
 
- (void)handleSingleTap:(UITapGestureRecognizer *)gesture
{
  if (_pointer_is_indirect)
    [self moveCursorToSessionViewPosition:[gesture locationInView:_session_view]];
  [self sendMouseButtonEvent:GetLeftMouseButtonClickEvent(YES)];
  [self sendMouseButtonEvent:GetLeftMouseButtonClickEvent(NO)];
}
 
- (void)handleSecondaryTap:(UITapGestureRecognizer *)gesture
{
  [self moveCursorToSessionViewPosition:[gesture locationInView:_session_view]];
  [self sendMouseButtonEvent:GetRightMouseButtonClickEvent(YES)];
  [self sendMouseButtonEvent:GetRightMouseButtonClickEvent(NO)];
}
 
- (void)handleLongPress:(UILongPressGestureRecognizer *)gesture
{
  if ([gesture state] == UIGestureRecognizerStateBegan)
  {
    _long_press_active = YES;
    _mouse_drag_active = NO;
  }
  else if ([gesture state] == UIGestureRecognizerStateEnded ||
           [gesture state] == UIGestureRecognizerStateCancelled ||
           [gesture state] == UIGestureRecognizerStateFailed)
  {
    if (_mouse_drag_active)
      [self sendMouseButtonEvent:GetLeftMouseButtonClickEvent(NO)];
    else if ([gesture state] == UIGestureRecognizerStateEnded)
    {
      [self sendMouseButtonEvent:GetRightMouseButtonClickEvent(YES)];
      [self sendMouseButtonEvent:GetRightMouseButtonClickEvent(NO)];
    }
 
    _mouse_drag_active = NO;
    _long_press_active = NO;
  }
}
 
- (void)handleMousePan:(UIPanGestureRecognizer *)gesture
{
  // A mouse/trackpad drag holds a button down, so move the cursor absolutely and
  // keep the left button pressed for the duration of the drag.
  if (_pointer_is_indirect)
  {
    [self moveCursorToSessionViewPosition:[gesture locationInView:_session_view]];
 
    if ([gesture state] == UIGestureRecognizerStateBegan)
    {
      [self sendMouseButtonEvent:GetLeftMouseButtonClickEvent(YES)];
      _mouse_drag_active = YES;
    }
    else if ([gesture state] == UIGestureRecognizerStateEnded ||
             [gesture state] == UIGestureRecognizerStateCancelled ||
             [gesture state] == UIGestureRecognizerStateFailed)
    {
      if (_mouse_drag_active)
        [self sendMouseButtonEvent:GetLeftMouseButtonClickEvent(NO)];
      _mouse_drag_active = NO;
    }
    return;
  }
 
  CGPoint location = [gesture locationInView:_session_scrollview];
 
  if ([gesture state] == UIGestureRecognizerStateBegan)
  {
    _mouse_pan_active = YES;
    _last_mouse_pan_location = location;
    if (_long_press_active && !_mouse_drag_active)
    {
      [self sendMouseButtonEvent:GetLeftMouseButtonClickEvent(YES)];
      _mouse_drag_active = YES;
    }
  }
  else if ([gesture state] == UIGestureRecognizerStateChanged)
  {
    if (_long_press_active && !_mouse_drag_active)
    {
      [self sendMouseButtonEvent:GetLeftMouseButtonClickEvent(YES)];
      _mouse_drag_active = YES;
    }
 
    CGPoint delta = CGPointMake(location.x - _last_mouse_pan_location.x,
                                location.y - _last_mouse_pan_location.y);
    [self moveCursorByViewportDelta:delta];
    _last_mouse_pan_location = location;
  }
  else if ([gesture state] == UIGestureRecognizerStateEnded ||
           [gesture state] == UIGestureRecognizerStateCancelled ||
           [gesture state] == UIGestureRecognizerStateFailed)
  {
    _mouse_pan_active = NO;
  }
}
 
- (void)handleHover:(UIHoverGestureRecognizer *)gesture
{
  if ([gesture state] != UIGestureRecognizerStateBegan &&
      [gesture state] != UIGestureRecognizerStateChanged)
    return;
 
  [self moveCursorToSessionViewPosition:[gesture locationInView:_session_view]];
}
 
- (void)handleDoubleLongPress:(UILongPressGestureRecognizer *)gesture
{
  // this point is mapped against the scroll view because we want to have relative movement to the
  // screen/scrollview
  CGPoint pos = [gesture locationInView:_session_scrollview];
  CGPoint session_view_pos = [self currentCursorViewPosition];
 
  if ([gesture state] == UIGestureRecognizerStateBegan)
    _prev_long_press_position = pos;
  else if ([gesture state] == UIGestureRecognizerStateChanged)
  {
    int delta = _prev_long_press_position.y - pos.y;
 
    if (delta > GetScrollGestureDelta())
    {
      [_session sendInputEvent:[self eventDescriptorForMouseEvent:GetMouseWheelEvent(YES)
                                                         position:session_view_pos]];
      _prev_long_press_position = pos;
    }
    else if (delta < -GetScrollGestureDelta())
    {
      [_session sendInputEvent:[self eventDescriptorForMouseEvent:GetMouseWheelEvent(NO)
                                                         position:session_view_pos]];
      _prev_long_press_position = pos;
    }
  }
}
 
- (void)handleScroll:(UIPanGestureRecognizer *)gesture
{
  CGFloat delta = [gesture translationInView:_session_view].y;
  if (fabs(delta) < GetScrollGestureDelta())
    return;
 
  CGPoint position = [self currentCursorViewPosition];
  [_session sendInputEvent:[self eventDescriptorForMouseEvent:GetMouseWheelEvent(delta > 0)
                                                     position:position]];
  [gesture setTranslation:CGPointZero inView:_session_view];
}
 
- (void)handleSingle3FingersTap:(UITapGestureRecognizer *)gesture
{
  [_session setToolbarVisible:![_session toolbarVisible]];
  [self showSessionToolbar:[_session toolbarVisible]];
}
 
- (UIPointerStyle *)pointerInteraction:(UIPointerInteraction *)interaction
                        styleForRegion:(UIPointerRegion *)region
{
  return [UIPointerStyle hiddenPointerStyle];
}
 
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
       shouldReceiveTouch:(UITouch *)touch
{
  // the scroll recognizer only handles pointer scroll events, never touches
  if ([gestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]] &&
      [(UIPanGestureRecognizer *)gestureRecognizer allowedScrollTypesMask] != 0)
    return NO;
 
  _pointer_is_indirect = ([touch type] == UITouchTypeIndirectPointer);
 
  // the long press maps to a right-click / drag for touch input, which a connected
  // mouse handles through its own buttons instead
  if (_pointer_is_indirect &&
      [gestureRecognizer isKindOfClass:[UILongPressGestureRecognizer class]])
    return NO;
 
  return YES;
}
 
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
    shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
  BOOL panAndHold =
      ([gestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]] &&
       [otherGestureRecognizer isKindOfClass:[UILongPressGestureRecognizer class]]) ||
      ([gestureRecognizer isKindOfClass:[UILongPressGestureRecognizer class]] &&
       [otherGestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]]);
  return panAndHold;
}
 
@end
 
@implementation RDPSessionViewController (Private)
 
#pragma mark -
#pragma mark Helper functions
 
- (void)showConnectingViewWithText:(NSString *)text
{
  [self hideConnectingView];
 
  // load connecting view
  [[NSBundle mainBundle] loadNibNamed:@"RDPConnectingView" owner:self options:nil];
 
  // set strings
  [_lbl_connecting setText:text];
  [_cancel_connect_button setTitle:NSLocalizedString(@"Cancel", @"Cancel Button")
                          forState:UIControlStateNormal];
 
  // center view and give it round corners
  [_connecting_view setCenter:[[self view] center]];
  [[_connecting_view layer] setCornerRadius:10];
 
  // display connecting view and start indicator
  [[self view] addSubview:_connecting_view];
  [_connecting_indicator_view startAnimating];
}
 
- (void)hideConnectingView
{
  if (!_connecting_view)
    return;
 
  // remove and release connecting view
  [_connecting_indicator_view stopAnimating];
  [_connecting_view removeFromSuperview];
  [_connecting_view autorelease];
  _connecting_view = nil;
}
 
- (void)endBackgroundTask
{
  if (_background_task == UIBackgroundTaskInvalid)
    return;
 
  [[UIApplication sharedApplication] endBackgroundTask:_background_task];
  _background_task = UIBackgroundTaskInvalid;
}
 
- (CGRect)sessionViewportFrame
{
  // use full screen (ipad or 'Avoid Screen Edges' disabled)
  if (IsPad() || ![[NSUserDefaults standardUserDefaults] boolForKey:@"ui.avoid_screen_edges"])
    return [[self view] bounds];
 
  // if 'Avoid Screen Edges' enabled (only for iphone)
  return UIEdgeInsetsInsetRect([[self view] bounds], [[self view] safeAreaInsets]);
}
 
- (void)fitSessionViewToViewport
{
  CGSize viewportSize = [_session_scrollview bounds].size;
  CGSize remoteSize = [_session_view bounds].size;
  if (viewportSize.width <= 0.0f || viewportSize.height <= 0.0f || remoteSize.width <= 0.0f ||
      remoteSize.height <= 0.0f)
    return;
 
  CGFloat fitScale =
      MIN(viewportSize.width / remoteSize.width, viewportSize.height / remoteSize.height);
  [_session_scrollview setMinimumZoomScale:fitScale];
  [_session_scrollview setMaximumZoomScale:MAX(2.0f, fitScale)];
  [_session_scrollview setZoomScale:fitScale animated:NO];
  [_session_scrollview setContentOffset:CGPointZero animated:NO];
  _last_session_viewport_size = viewportSize;
  [self centerSessionViewInViewport];
}
 
- (void)centerSessionViewInViewport
{
  CGSize viewportSize = [_session_scrollview bounds].size;
  CGRect sessionFrame = [_session_view frame];
  if (viewportSize.width <= 0.0f || viewportSize.height <= 0.0f ||
      sessionFrame.size.width <= 0.0f || sessionFrame.size.height <= 0.0f)
    return;
 
  sessionFrame.origin.x = MAX((viewportSize.width - sessionFrame.size.width) * 0.5f, 0.0f);
  sessionFrame.origin.y = MAX((viewportSize.height - sessionFrame.size.height) * 0.5f, 0.0f);
  [_session_view setFrame:sessionFrame];
 
  [_session_scrollview
      setContentSize:CGSizeMake(MAX(viewportSize.width, sessionFrame.size.width),
                                MAX(viewportSize.height, sessionFrame.size.height))];
}
 
- (void)setKeyboardOverlap:(CGFloat)overlap
{
  // extend the scrollable area to push up using 2 finger
  UIEdgeInsets inset = [_session_scrollview contentInset];
  inset.bottom = overlap;
  [_session_scrollview setContentInset:inset];
 
  CGPoint offset = [_session_scrollview contentOffset];
  CGFloat viewportHeight = [_session_scrollview bounds].size.height;
 
  // cursor is usually located in typing area
  if (overlap > 0.0 && _has_cursor_view_position)
  {
    CGPoint cursor = [_session_scrollview convertPoint:_cursor_view_position
                                              fromView:_session_view];
    CGFloat visibleBottom = offset.y + viewportHeight - overlap;
    CGFloat hiddenHeight = cursor.y + KEYBOARD_CURSOR_MARGIN - visibleBottom;
    if (hiddenHeight > 0.0)
      offset.y += hiddenHeight;
  }
 
  // stay within the scrollable range or scrolls back once the keyboard hides
  CGFloat maxOffsetY = [_session_scrollview contentSize].height + overlap - viewportHeight;
  offset.y = MAX(MIN(offset.y, maxOffsetY), 0.0);
  [_session_scrollview setContentOffset:offset animated:YES];
}
 
- (void)showSessionToolbar:(BOOL)show
{
  // already shown or hidden?
  if (_session_toolbar_visible == show)
    return;
 
  // Offset by the safe-area insets so the toolbar/buttons are not hidden behind
  // the status bar / notch / Dynamic Island on modern devices (and side notch
  // in landscape).
  UIEdgeInsets safe = [[self view] safeAreaInsets];
  // devices without a notch (e.g. iPad) have no top inset once the status bar is hidden,
  // so keep at least the system margin to the top edge
  safe.top = MAX(safe.top, [self systemMinimumLayoutMargins].leading);
  CGFloat toolbarWidth = [[self view] bounds].size.width - safe.left - safe.right;
 
  if (show)
  {
    [UIView animateWithDuration:0.4
                          delay:0.0
                        options:UIViewAnimationOptionCurveLinear
                     animations:^{
                       [_session_toolbar setFrame:CGRectMake(safe.left, safe.top,
                                                             toolbarWidth, TOOLBAR_HEIGHT)];
                     }
                     completion:nil];
    _session_toolbar_visible = YES;
  }
  else
  {
    [UIView animateWithDuration:0.4
                          delay:0.0
                        options:UIViewAnimationOptionCurveLinear
                     animations:^{
                       [_session_toolbar setFrame:CGRectMake(safe.left, -TOOLBAR_HEIGHT,
                                                             toolbarWidth, TOOLBAR_HEIGHT)];
                     }
                     completion:nil];
    _session_toolbar_visible = NO;
  }
}
 
- (void)initGestureRecognizers
{
  // single tap recognizer. A double-click is just two quick taps, which the server
  // coalesces on its own, so we avoid the latency of waiting for a double-tap to fail.
  UITapGestureRecognizer *singleTapRecognizer =
      [[[UITapGestureRecognizer alloc] initWithTarget:self
                                               action:@selector(handleSingleTap:)] autorelease];
  [singleTapRecognizer setNumberOfTouchesRequired:1];
  [singleTapRecognizer setNumberOfTapsRequired:1];
  [singleTapRecognizer setDelegate:self];
 
  // long press gesture recognizer
  UILongPressGestureRecognizer *longPressRecognizer = [[[UILongPressGestureRecognizer alloc]
      initWithTarget:self
              action:@selector(handleLongPress:)] autorelease];
  [longPressRecognizer setMinimumPressDuration:0.3];
  [longPressRecognizer setAllowableMovement:12.0];
  [longPressRecognizer setDelegate:self];
 
  // One-finger movement behaves like a trackpad and moves the remote cursor relatively.
  UIPanGestureRecognizer *mousePanRecognizer =
      [[[UIPanGestureRecognizer alloc] initWithTarget:self
                                               action:@selector(handleMousePan:)] autorelease];
  [mousePanRecognizer setMinimumNumberOfTouches:1];
  [mousePanRecognizer setMaximumNumberOfTouches:1];
  [mousePanRecognizer setDelegate:self];
 
  // A connected mouse/trackpad moves the remote cursor absolutely while hovering.
  UIHoverGestureRecognizer *hoverRecognizer =
      [[[UIHoverGestureRecognizer alloc] initWithTarget:self
                                                 action:@selector(handleHover:)] autorelease];
  [hoverRecognizer setDelegate:self];
 
  // Secondary mouse/trackpad button maps to a right-click. Standard tap recognizers
  // only track the primary button, so this needs its own recognizer.
  UITapGestureRecognizer *secondaryTapRecognizer = [[[UITapGestureRecognizer alloc]
      initWithTarget:self
              action:@selector(handleSecondaryTap:)] autorelease];
  [secondaryTapRecognizer setButtonMaskRequired:UIEventButtonMaskSecondary];
  [secondaryTapRecognizer setAllowedTouchTypes:@[@(UITouchTypeIndirectPointer)]];
  [secondaryTapRecognizer setDelegate:self];
 
  // Mouse wheel and trackpad scrolling are forwarded as remote wheel events. Setting a
  // scroll type mask lets this pan recognizer receive pointer scroll device events.
  UIPanGestureRecognizer *scrollRecognizer =
      [[[UIPanGestureRecognizer alloc] initWithTarget:self
                                               action:@selector(handleScroll:)] autorelease];
  [scrollRecognizer setAllowedScrollTypesMask:UIScrollTypeMaskAll];
  [scrollRecognizer setDelegate:self];
 
  // double long press gesture recognizer
  UILongPressGestureRecognizer *doubleLongPressRecognizer = [[[UILongPressGestureRecognizer alloc]
      initWithTarget:self
              action:@selector(handleDoubleLongPress:)] autorelease];
  [doubleLongPressRecognizer setNumberOfTouchesRequired:2];
  [doubleLongPressRecognizer setMinimumPressDuration:0.3];
 
  // 3 finger, single tap gesture for showing/hiding the toolbar
  UITapGestureRecognizer *single3FingersTapRecognizer = [[[UITapGestureRecognizer alloc]
      initWithTarget:self
              action:@selector(handleSingle3FingersTap:)] autorelease];
  [single3FingersTapRecognizer setNumberOfTapsRequired:1];
  [single3FingersTapRecognizer setNumberOfTouchesRequired:3];
  [singleTapRecognizer requireGestureRecognizerToFail:longPressRecognizer];
 
  // Reserve one finger for the mouse; two fingers still pan/zoom the viewport.
  [[_session_scrollview panGestureRecognizer] setMinimumNumberOfTouches:2];
 
  // add gestures to scroll view
  [_session_scrollview addGestureRecognizer:singleTapRecognizer];
  [_session_scrollview addGestureRecognizer:longPressRecognizer];
  [_session_scrollview addGestureRecognizer:mousePanRecognizer];
  [_session_scrollview addGestureRecognizer:hoverRecognizer];
  [_session_scrollview addGestureRecognizer:secondaryTapRecognizer];
  [_session_scrollview addGestureRecognizer:scrollRecognizer];
  [_session_scrollview addGestureRecognizer:doubleLongPressRecognizer];
  [_session_scrollview addGestureRecognizer:single3FingersTapRecognizer];
 
  // Hide the system pointer over the session so only the remote cursor is visible.
  UIPointerInteraction *pointerInteraction =
      [[[UIPointerInteraction alloc] initWithDelegate:self] autorelease];
  [_session_view addInteraction:pointerInteraction];
}
 
- (void)suspendSession
{
  // suspend session and pop navigation controller
  [_session suspend];
 
  // pop current view controller
  [[self navigationController] popViewControllerAnimated:YES];
}
 
- (NSDictionary *)eventDescriptorForMouseEvent:(int)event position:(CGPoint)position
{
  CGPoint remote_position = [self remotePositionForSessionViewPosition:position];
  return [NSDictionary
      dictionaryWithObjectsAndKeys:@"mouse", @"type", [NSNumber numberWithUnsignedShort:event],
                                   @"flags",
                                   [NSNumber numberWithUnsignedShort:lrintf(remote_position.x)],
                                   @"coord_x",
                                   [NSNumber numberWithUnsignedShort:lrintf(remote_position.y)],
                                   @"coord_y", nil];
}
 
- (CGPoint)remotePositionForSessionViewPosition:(CGPoint)position
{
  rdpSettings *settings = [_session getSessionParams];
  CGSize viewSize = [_session_view bounds].size;
  CGFloat desktopWidth =
      settings ? freerdp_settings_get_uint32(settings, FreeRDP_DesktopWidth) : 0;
  CGFloat desktopHeight =
      settings ? freerdp_settings_get_uint32(settings, FreeRDP_DesktopHeight) : 0;
 
  if ((viewSize.width > 0.0f) && (desktopWidth > 0.0f))
    position.x = position.x * desktopWidth / viewSize.width;
  if ((viewSize.height > 0.0f) && (desktopHeight > 0.0f))
    position.y = position.y * desktopHeight / viewSize.height;
 
  if (desktopWidth > 0.0f)
    position.x = MIN(MAX(position.x, 0.0f), desktopWidth - 1.0f);
  if (desktopHeight > 0.0f)
    position.y = MIN(MAX(position.y, 0.0f), desktopHeight - 1.0f);
 
  return position;
}
 
- (CGPoint)sessionViewPositionForRemotePosition:(CGPoint)position
{
  rdpSettings *settings = [_session getSessionParams];
  CGSize viewSize = [_session_view bounds].size;
  CGFloat desktopWidth =
      settings ? freerdp_settings_get_uint32(settings, FreeRDP_DesktopWidth) : 0;
  CGFloat desktopHeight =
      settings ? freerdp_settings_get_uint32(settings, FreeRDP_DesktopHeight) : 0;
 
  if ((desktopWidth > 0.0f) && (viewSize.width > 0.0f))
    position.x = position.x * viewSize.width / desktopWidth;
  if ((desktopHeight > 0.0f) && (viewSize.height > 0.0f))
    position.y = position.y * viewSize.height / desktopHeight;
 
  return [self clampedSessionViewCursorPosition:position];
}
 
- (CGPoint)clampedSessionViewCursorPosition:(CGPoint)position
{
  CGSize viewSize = [_session_view bounds].size;
  if (viewSize.width > 0.0f)
    position.x = MIN(MAX(position.x, 0.0f), viewSize.width - 1.0f);
  if (viewSize.height > 0.0f)
    position.y = MIN(MAX(position.y, 0.0f), viewSize.height - 1.0f);
  return position;
}
 
- (CGPoint)currentCursorViewPosition
{
  if (!_has_cursor_view_position)
  {
    CGSize viewSize = [_session_view bounds].size;
    _cursor_view_position = CGPointMake(MAX(viewSize.width - 1.0, 0.0) * 0.5,
                                        MAX(viewSize.height - 1.0, 0.0) * 0.5);
    _has_cursor_view_position = YES;
    [_session_view setRemoteCursorPosition:_cursor_view_position];
  }
  [_session_view showRemoteCursor];
 
  return _cursor_view_position;
}
 
- (void)moveCursorByViewportDelta:(CGPoint)delta
{
  CGPoint position = [self currentCursorViewPosition];
  CGFloat zoomScale = [_session_scrollview zoomScale];
  if (zoomScale <= 0.0)
    zoomScale = 1.0;
 
  position.x += delta.x / zoomScale;
  position.y += delta.y / zoomScale;
  position = [self clampedSessionViewCursorPosition:position];
  _cursor_view_position = position;
  _has_cursor_view_position = YES;
  _has_user_moved_cursor = YES;
 
  // Local prediction keeps the cursor responsive while the RDP event is in flight.
  [_session_view setRemoteCursorPosition:position];
  [self handleMouseMoveForPosition:position];
}
 
- (void)moveCursorToSessionViewPosition:(CGPoint)position
{
  position = [self clampedSessionViewCursorPosition:position];
  _cursor_view_position = position;
  _has_cursor_view_position = YES;
  _has_user_moved_cursor = YES;
 
  // Local prediction keeps the cursor responsive while the RDP event is in flight.
  [_session_view setRemoteCursorPosition:position];
  [_session_view showRemoteCursor];
  [self handleMouseMoveForPosition:position];
}
 
- (void)sendMouseButtonEvent:(int)event
{
  // typed text can not be changed anymore.
  [self commitTextInput];
  CGPoint position = [self currentCursorViewPosition];
  [_session sendInputEvent:[self eventDescriptorForMouseEvent:event position:position]];
}
 
- (void)handleMouseMoveForPosition:(CGPoint)position
{
  [_session sendInputEvent:[self eventDescriptorForMouseEvent:PTR_FLAGS_MOVE position:position]];
}
 
- (BOOL)isKeyboardActive
{
  return [_dummy_textfield isFirstResponder];
}
 
- (void)resetTextInput
{
  [_dummy_textfield setText:@""];
  [_sent_text release];
  _sent_text = [@"" retain];
}
 
- (void)commitTextInput
{
  if ([[_dummy_textfield text] length] == 0)
    return;
 
  // send the text being composed as it is
  [_dummy_textfield unmarkText];
  [self textInputChanged:_dummy_textfield];
  [self resetTextInput];
}
 
- (BOOL)isLandscape
{
  CGSize size = [[self view] bounds].size;
  return size.width > size.height;
}
 
- (CGFloat)advancedKeyboardHeight
{
  // before the system keyboard was shown in this orientation, use a typical height
  if ([self isLandscape])
    return (_keyboard_height_landscape > 0.0) ? _keyboard_height_landscape
                                              : (IsPad() ? 400.0 : 200.0);
  return (_keyboard_height_portrait > 0.0) ? _keyboard_height_portrait
                                           : (IsPad() ? 320.0 : 290.0);
}
 
@end