FreeRDP/client/iOS/Controllers/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 "RDPSessionViewController.h"
#import "RDPKeyboard.h"
#import "Utils.h"
#import "Toast+UIView.h"
#import "ConnectionParams.h"
#import "CredentialsInputController.h"
#import "VerifyCertificateController.h"
#import "BlockAlertView.h"

#define TOOLBAR_HEIGHT 30

#define AUTOSCROLLDISTANCE 20
#define AUTOSCROLLTIMEOUT 0.05

@interface RDPSessionViewController (Private)
- (void)showSessionToolbar:(BOOL)show;
- (UIToolbar *)keyboardToolbar;
- (void)initGestureRecognizers;
- (void)suspendSession;
- (NSDictionary *)eventDescriptorForMouseEvent:(int)event position:(CGPoint)position;
- (void)handleMouseMoveForPosition:(CGPoint)position;
@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;

		_mouse_move_events_skipped = 0;
		_mouse_move_event_timer = nil;

		_advanced_keyboard_view = nil;
		_advanced_keyboard_visible = NO;
		_requesting_advanced_keyboard = NO;
		_keyboard_last_height = 0;

		_session_toolbar_visible = NO;

		_toggle_mouse_button = NO;

		_autoscroll_with_touchpointer =
		    [[NSUserDefaults standardUserDefaults] boolForKey:@"ui.auto_scroll_touchpointer"];
		_is_autoscrolling = NO;

		[UIView setAnimationDelegate:self];
		[UIView setAnimationDidStopSelector:@selector(animationStopped:finished:context:)];
	}

	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];

	// init keyboard handling vars
	_keyboard_visible = NO;

	// init keyboard toolbar
	_keyboard_toolbar = [[self keyboardToolbar] retain];
	[_dummy_textfield setInputAccessoryView:_keyboard_toolbar];

	// 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];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
	return YES;
}

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
	if (![_touchpointer_view isHidden])
		[_touchpointer_view ensurePointerIsVisible];
}

- (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];

	// hide navigation bar and (if enabled) the status bar
	if ([[NSUserDefaults standardUserDefaults] boolForKey:@"ui.hide_status_bar"])
	{
		if (animated == YES)
			[[UIApplication sharedApplication] setStatusBarHidden:YES
			                                        withAnimation:UIStatusBarAnimationSlide];
		else
			[[UIApplication sharedApplication] setStatusBarHidden:YES
			                                        withAnimation:UIStatusBarAnimationNone];
	}
	[[self navigationController] setNavigationBarHidden:YES animated:animated];

	// if sesssion 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];
			[_session_view setNeedsDisplay];
		}
		else
			[_session connect];

		_session_initilized = YES;
	}
}

- (void)viewWillDisappear:(BOOL)animated
{
	[super viewWillDisappear:animated];

	// show navigation and status bar again
	if (animated == YES)
		[[UIApplication sharedApplication] setStatusBarHidden:NO
		                                        withAnimation:UIStatusBarAnimationSlide];
	else
		[[UIApplication sharedApplication] setStatusBarHidden:NO
		                                        withAnimation:UIStatusBarAnimationNone];
	[[self navigationController] setNavigationBarHidden:NO animated:animated];

	// 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];
	[_session release];
	[super dealloc];
}

#pragma mark -
#pragma mark ScrollView delegate methods

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
	return _session_view;
}

- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView
                       withView:(UIView *)view
                        atScale:(float)scale
{
	NSLog(@"New zoom scale: %f", scale);
	[_session_view setNeedsDisplay];
}

#pragma mark -
#pragma mark TextField delegate methods
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
	_keyboard_visible = YES;
	_advanced_keyboard_visible = NO;
	return YES;
}

- (BOOL)textFieldShouldEndEditing:(UITextField *)textField
{
	_keyboard_visible = NO;
	_advanced_keyboard_visible = NO;
	return YES;
}

- (BOOL)textField:(UITextField *)textField
    shouldChangeCharactersInRange:(NSRange)range
                replacementString:(NSString *)string
{
	if ([string length] > 0)
	{
		for (int i = 0; i < [string length]; i++)
		{
			unichar curChar = [string characterAtIndex:i];

			// special handling for return/enter key
			if (curChar == '\n')
				[[RDPKeyboard getSharedRDPKeyboard] sendEnterKeyStroke];
			else
				[[RDPKeyboard getSharedRDPKeyboard] sendUnicode:curChar];
		}
	}
	else
	{
		[[RDPKeyboard getSharedRDPKeyboard] sendBackspaceKeyStroke];
	}

	return NO;
}

#pragma mark -
#pragma mark AdvancedKeyboardDelegate functions
- (void)advancedKeyPressedVKey:(int)key
{
	[[RDPKeyboard getSharedRDPKeyboard] sendVirtualKeyCode:key];
}

- (void)advancedKeyPressedUnicode:(int)key
{
	[[RDPKeyboard getSharedRDPKeyboard] sendUnicode:key];
}

#pragma mark - RDP keyboard handler

- (void)modifiersChangedForKeyboard:(RDPKeyboard *)keyboard
{
	UIBarButtonItem *curItem;

	// shift button (only on iPad)
	int objectIdx = 0;
	if (IsPad())
	{
		objectIdx = 2;
		curItem = (UIBarButtonItem *)[[_keyboard_toolbar items] objectAtIndex:objectIdx];
		[curItem setStyle:[keyboard shiftPressed] ? UIBarButtonItemStyleDone
		                                          : UIBarButtonItemStyleBordered];
	}

	// ctrl button
	objectIdx += 2;
	curItem = (UIBarButtonItem *)[[_keyboard_toolbar items] objectAtIndex:objectIdx];
	[curItem
	    setStyle:[keyboard ctrlPressed] ? UIBarButtonItemStyleDone : UIBarButtonItemStyleBordered];

	// win button
	objectIdx += 2;
	curItem = (UIBarButtonItem *)[[_keyboard_toolbar items] objectAtIndex:objectIdx];
	[curItem
	    setStyle:[keyboard winPressed] ? UIBarButtonItemStyleDone : UIBarButtonItemStyleBordered];

	// alt button
	objectIdx += 2;
	curItem = (UIBarButtonItem *)[[_keyboard_toolbar items] objectAtIndex:objectIdx];
	[curItem
	    setStyle:[keyboard altPressed] ? UIBarButtonItemStyleDone : UIBarButtonItemStyleBordered];
}

#pragma mark -
#pragma mark RDPSessionDelegate functions

- (void)session:(RDPSession *)session didFailToConnect:(int)reason
{
	// remove and release connecting view
	[_connecting_indicator_view stopAnimating];
	[_connecting_view removeFromSuperview];
	[_connecting_view autorelease];

	// return to bookmark list
	[[self navigationController] popViewControllerAnimated:YES];
}

- (void)sessionWillConnect:(RDPSession *)session
{
	// load connecting view
	[[NSBundle mainBundle] loadNibNamed:@"RDPConnectingView" owner:self options:nil];

	// set strings
	[_lbl_connecting setText:NSLocalizedString(@"Connecting", @"Connecting progress view - label")];
	[_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)sessionDidConnect:(RDPSession *)session
{
	// register keyboard notification handlers
	[[NSNotificationCenter defaultCenter] addObserver:self
	                                         selector:@selector(keyboardWillShow:)
	                                             name:UIKeyboardWillShowNotification
	                                           object:nil];
	[[NSNotificationCenter defaultCenter] addObserver:self
	                                         selector:@selector(keyboardDidShow:)
	                                             name:UIKeyboardDidShowNotification
	                                           object:nil];
	[[NSNotificationCenter defaultCenter] addObserver:self
	                                         selector:@selector(keyboardWillHide:)
	                                             name:UIKeyboardWillHideNotification
	                                           object:nil];
	[[NSNotificationCenter defaultCenter] addObserver:self
	                                         selector:@selector(keyboardDidHide:)
	                                             name:UIKeyboardDidHideNotification
	                                           object:nil];

	// remove and release connecting view
	[_connecting_indicator_view stopAnimating];
	[_connecting_view removeFromSuperview];
	[_connecting_view autorelease];

	// 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];
	if (([orig_params intForKey:@"width"] != sess_params->DesktopWidth &&
	     [orig_params intForKey:@"width"] != (sess_params->DesktopWidth + 1)) ||
	    [orig_params intForKey:@"height"] != sess_params->DesktopHeight ||
	    [orig_params intForKey:@"colors"] != sess_params->ColorDepth)
	{
		// 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"),
		                               sess_params->DesktopWidth, sess_params->DesktopHeight,
		                               sess_params->ColorDepth];
		[[self view] makeToast:message duration:ToastDurationNormal position:@"bottom"];
	}
}

- (void)sessionWillDisconnect:(RDPSession *)session
{
}

- (void)sessionDidDisconnect:(RDPSession *)session
{
	// return to bookmark list
	[[self navigationController] popViewControllerAnimated:YES];
}

- (void)sessionBitmapContextWillChange:(RDPSession *)session
{
	// calc new view frame
	rdpSettings *sess_params = [session getSessionParams];
	CGRect view_rect = CGRectMake(0, 0, sess_params->DesktopWidth, sess_params->DesktopHeight);

	// reset  zoom level and update content size
	[_session_scrollview setZoomScale:1.0];
	[_session_scrollview setContentSize:view_rect.size];

	// set session view size
	[_session_view setFrame:view_rect];

	// show/hide toolbar
	[_session
	    setToolbarVisible:![[NSUserDefaults standardUserDefaults] boolForKey:@"ui.hide_tool_bar"]];
	[self showSessionToolbar:[_session toolbarVisible]];
}

- (void)sessionBitmapContextDidChange:(RDPSession *)session
{
	// associate view with session
	[_session_view setSession:session];

	// issue an update (this might be needed in case we had a resize for instance)
	[_session_view setNeedsDisplay];
}

- (void)session:(RDPSession *)session needsRedrawInRect:(CGRect)rect
{
	[_session_view setNeedsDisplayInRect:rect];
}

- (void)session:(RDPSession *)session requestsAuthenticationWithParams:(NSMutableDictionary *)params
{
	CredentialsInputController *view_controller =
	    [[[CredentialsInputController alloc] initWithNibName:@"CredentialsInputView"
	                                                  bundle:nil
	                                                 session:_session
	                                                  params:params] autorelease];
	[self presentModalViewController:view_controller animated:YES];
}

- (void)session:(RDPSession *)session verifyCertificateWithParams:(NSMutableDictionary *)params
{
	VerifyCertificateController *view_controller =
	    [[[VerifyCertificateController alloc] initWithNibName:@"VerifyCertificateView"
	                                                   bundle:nil
	                                                  session:_session
	                                                   params:params] autorelease];
	[self presentModalViewController:view_controller animated:YES];
}

- (CGSize)sizeForFitScreenForSession:(RDPSession *)session
{
	if (IsPad())
		return [self view].bounds.size;
	else
	{
		// on phones make a resolution that has a 16:10 ratio with the phone's height
		CGSize size = [self view].bounds.size;
		CGFloat maxSize = (size.width > size.height) ? size.width : size.height;
		return CGSizeMake(maxSize * 1.6f, maxSize);
	}
}

#pragma mark - Keyboard Toolbar Handlers

- (void)showAdvancedKeyboardAnimated
{
	// calc initial and final rect of the advanced keyboard view
	CGRect rect = [[_keyboard_toolbar superview] bounds];
	rect.origin.y = [_keyboard_toolbar bounds].size.height;
	rect.size.height -= rect.origin.y;

	// create new view (hidden) and add to host-view of keyboard toolbar
	_advanced_keyboard_view = [[AdvancedKeyboardView alloc]
	    initWithFrame:CGRectMake(rect.origin.x, [[_keyboard_toolbar superview] bounds].size.height,
	                             rect.size.width, rect.size.height)
	         delegate:self];
	[[_keyboard_toolbar superview] addSubview:_advanced_keyboard_view];
	// we set autoresize to YES for the keyboard toolbar's superview so that our adv. keyboard view
	// gets properly resized
	[[_keyboard_toolbar superview] setAutoresizesSubviews:YES];

	// show view with animation
	[UIView beginAnimations:nil context:NULL];
	[_advanced_keyboard_view setFrame:rect];
	[UIView commitAnimations];
}

- (IBAction)toggleKeyboardWhenOtherVisible:(id)sender
{
	if (_advanced_keyboard_visible == NO)
	{
		[self showAdvancedKeyboardAnimated];
	}
	else
	{
		// hide existing view
		[UIView beginAnimations:@"hide_advanced_keyboard_view" context:NULL];
		CGRect rect = [_advanced_keyboard_view frame];
		rect.origin.y = [[_keyboard_toolbar superview] bounds].size.height;
		[_advanced_keyboard_view setFrame:rect];
		[UIView commitAnimations];

		// the view is released in the animationDidStop selector registered in init
	}

	// toggle flag
	_advanced_keyboard_visible = !_advanced_keyboard_visible;
}

- (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)pressEscKey:(id)sender
{
	[[RDPKeyboard getSharedRDPKeyboard] sendEscapeKeyStroke];
}

#pragma mark -
#pragma mark event handlers

- (void)animationStopped:(NSString *)animationID
                finished:(NSNumber *)finished
                 context:(void *)context
{
	if ([animationID isEqualToString:@"hide_advanced_keyboard_view"])
	{
		// cleanup advanced keyboard view
		[_advanced_keyboard_view removeFromSuperview];
		[_advanced_keyboard_view autorelease];
		_advanced_keyboard_view = nil;
	}
}

- (IBAction)switchSession:(id)sender
{
	[self suspendSession];
}

- (IBAction)toggleKeyboard:(id)sender
{
	if (!_keyboard_visible)
		[_dummy_textfield becomeFirstResponder];
	else
		[_dummy_textfield resignFirstResponder];
}

- (IBAction)toggleExtKeyboard:(id)sender
{
	// if the sys kb is shown but not the advanced kb then toggle the advanced kb
	if (_keyboard_visible && !_advanced_keyboard_visible)
		[self toggleKeyboardWhenOtherVisible:nil];
	else
	{
		// if not visible request the advanced keyboard view
		if (_advanced_keyboard_visible == NO)
			_requesting_advanced_keyboard = YES;
		[self toggleKeyboard:nil];
	}
}

- (IBAction)toggleTouchPointer:(id)sender
{
	BOOL toggle_visibilty = ![_touchpointer_view isHidden];
	[_touchpointer_view setHidden:toggle_visibilty];
	if (toggle_visibilty)
		[_session_scrollview setContentInset:UIEdgeInsetsZero];
	else
		[_session_scrollview setContentInset:[_touchpointer_view getEdgeInsets]];
}

- (IBAction)disconnectSession:(id)sender
{
	[_session disconnect];
}

- (IBAction)cancelButtonPressed:(id)sender
{
	[_session disconnect];
}

#pragma mark -
#pragma mark iOS Keyboard Notification Handlers

// the keyboard is given in a portrait frame of reference
- (BOOL)isLandscape
{

	UIInterfaceOrientation ori = [[UIApplication sharedApplication] statusBarOrientation];
	return (ori == UIInterfaceOrientationLandscapeLeft ||
	        ori == UIInterfaceOrientationLandscapeRight);
}

- (void)shiftKeyboard:(NSNotification *)notification
{

	CGRect keyboardEndFrame =
	    [[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];

	CGFloat previousHeight = _keyboard_last_height;

	if ([self isLandscape])
	{
		// landscape has the keyboard based on x, so x can go negative
		_keyboard_last_height = keyboardEndFrame.size.width + keyboardEndFrame.origin.x;
	}
	else
	{
		// portrait has the keyboard based on the difference of the height and the frames y.
		CGFloat height = [[UIScreen mainScreen] bounds].size.height;
		_keyboard_last_height = height - keyboardEndFrame.origin.y;
	}

	CGFloat shiftHeight = _keyboard_last_height - previousHeight;

	[UIView beginAnimations:nil context:NULL];
	[UIView setAnimationCurve:[[[notification userInfo]
	                              objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue]];
	[UIView
	    setAnimationDuration:[[[notification userInfo]
	                             objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue]];
	CGRect frame = [_session_scrollview frame];
	frame.size.height -= shiftHeight;
	[_session_scrollview setFrame:frame];
	[_touchpointer_view setFrame:frame];
	[UIView commitAnimations];
}

- (void)keyboardWillShow:(NSNotification *)notification
{
	[self shiftKeyboard:notification];

	[_touchpointer_view ensurePointerIsVisible];
}

- (void)keyboardDidShow:(NSNotification *)notification
{
	if (_requesting_advanced_keyboard)
	{
		[self showAdvancedKeyboardAnimated];
		_advanced_keyboard_visible = YES;
		_requesting_advanced_keyboard = NO;
	}
}

- (void)keyboardWillHide:(NSNotification *)notification
{

	[self shiftKeyboard:notification];
}

- (void)keyboardDidHide:(NSNotification *)notification
{
	// release adanced keyboard view
	if (_advanced_keyboard_visible == YES)
	{
		_advanced_keyboard_visible = NO;
		[_advanced_keyboard_view removeFromSuperview];
		[_advanced_keyboard_view autorelease];
		_advanced_keyboard_view = nil;
	}
}

#pragma mark -
#pragma mark Gesture handlers

- (void)handleSingleTap:(UITapGestureRecognizer *)gesture
{
	CGPoint pos = [gesture locationInView:_session_view];
	if (_toggle_mouse_button)
	{
		[_session
		    sendInputEvent:[self eventDescriptorForMouseEvent:GetRightMouseButtonClickEvent(YES)
		                                             position:pos]];
		[_session
		    sendInputEvent:[self eventDescriptorForMouseEvent:GetRightMouseButtonClickEvent(NO)
		                                             position:pos]];
	}
	else
	{
		[_session
		    sendInputEvent:[self eventDescriptorForMouseEvent:GetLeftMouseButtonClickEvent(YES)
		                                             position:pos]];
		[_session sendInputEvent:[self eventDescriptorForMouseEvent:GetLeftMouseButtonClickEvent(NO)
		                                                   position:pos]];
	}

	_toggle_mouse_button = NO;
}

- (void)handleDoubleTap:(UITapGestureRecognizer *)gesture
{
	CGPoint pos = [gesture locationInView:_session_view];
	[_session sendInputEvent:[self eventDescriptorForMouseEvent:GetLeftMouseButtonClickEvent(YES)
	                                                   position:pos]];
	[_session sendInputEvent:[self eventDescriptorForMouseEvent:GetLeftMouseButtonClickEvent(NO)
	                                                   position:pos]];
	[_session sendInputEvent:[self eventDescriptorForMouseEvent:GetLeftMouseButtonClickEvent(YES)
	                                                   position:pos]];
	[_session sendInputEvent:[self eventDescriptorForMouseEvent:GetLeftMouseButtonClickEvent(NO)
	                                                   position:pos]];
	_toggle_mouse_button = NO;
}

- (void)handleLongPress:(UILongPressGestureRecognizer *)gesture
{
	CGPoint pos = [gesture locationInView:_session_view];

	if ([gesture state] == UIGestureRecognizerStateBegan)
		[_session
		    sendInputEvent:[self eventDescriptorForMouseEvent:GetLeftMouseButtonClickEvent(YES)
		                                             position:pos]];
	else if ([gesture state] == UIGestureRecognizerStateChanged)
		[self handleMouseMoveForPosition:pos];
	else if ([gesture state] == UIGestureRecognizerStateEnded)
		[_session sendInputEvent:[self eventDescriptorForMouseEvent:GetLeftMouseButtonClickEvent(NO)
		                                                   position:pos]];
}

- (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];

	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:pos]];
			_prev_long_press_position = pos;
		}
		else if (delta < -GetScrollGestureDelta())
		{
			[_session sendInputEvent:[self eventDescriptorForMouseEvent:GetMouseWheelEvent(NO)
			                                                   position:pos]];
			_prev_long_press_position = pos;
		}
	}
}

- (void)handleSingle2FingersTap:(UITapGestureRecognizer *)gesture
{
	_toggle_mouse_button = !_toggle_mouse_button;
}

- (void)handleSingle3FingersTap:(UITapGestureRecognizer *)gesture
{
	[_session setToolbarVisible:![_session toolbarVisible]];
	[self showSessionToolbar:[_session toolbarVisible]];
}

#pragma mark -
#pragma mark Touch Pointer delegates
// callback if touch pointer should be closed
- (void)touchPointerClose
{
	[self toggleTouchPointer:nil];
}

// callback for a left click action
- (void)touchPointerLeftClick:(CGPoint)pos down:(BOOL)down
{
	CGPoint session_view_pos = [_touchpointer_view convertPoint:pos toView:_session_view];
	[_session sendInputEvent:[self eventDescriptorForMouseEvent:GetLeftMouseButtonClickEvent(down)
	                                                   position:session_view_pos]];
}

// callback for a right click action
- (void)touchPointerRightClick:(CGPoint)pos down:(BOOL)down
{
	CGPoint session_view_pos = [_touchpointer_view convertPoint:pos toView:_session_view];
	[_session sendInputEvent:[self eventDescriptorForMouseEvent:GetRightMouseButtonClickEvent(down)
	                                                   position:session_view_pos]];
}

- (void)doAutoScrolling
{
	int scrollX = 0;
	int scrollY = 0;
	CGPoint curPointerPos = [_touchpointer_view getPointerPosition];
	CGRect viewBounds = [_touchpointer_view bounds];
	CGRect scrollBounds = [_session_view bounds];

	// add content insets to scroll bounds
	scrollBounds.size.width += [_session_scrollview contentInset].right;
	scrollBounds.size.height += [_session_scrollview contentInset].bottom;

	// add zoom factor
	scrollBounds.size.width *= [_session_scrollview zoomScale];
	scrollBounds.size.height *= [_session_scrollview zoomScale];

	if (curPointerPos.x > (viewBounds.size.width - [_touchpointer_view getPointerWidth]))
		scrollX = AUTOSCROLLDISTANCE;
	else if (curPointerPos.x < 0)
		scrollX = -AUTOSCROLLDISTANCE;

	if (curPointerPos.y > (viewBounds.size.height - [_touchpointer_view getPointerHeight]))
		scrollY = AUTOSCROLLDISTANCE;
	else if (curPointerPos.y < (_session_toolbar_visible ? TOOLBAR_HEIGHT : 0))
		scrollY = -AUTOSCROLLDISTANCE;

	CGPoint newOffset = [_session_scrollview contentOffset];
	newOffset.x += scrollX;
	newOffset.y += scrollY;

	// if offset is going off screen - stop scrolling in that direction
	if (newOffset.x < 0)
	{
		scrollX = 0;
		newOffset.x = 0;
	}
	else if (newOffset.x > (scrollBounds.size.width - viewBounds.size.width))
	{
		scrollX = 0;
		newOffset.x = MAX(scrollBounds.size.width - viewBounds.size.width, 0);
	}
	if (newOffset.y < 0)
	{
		scrollY = 0;
		newOffset.y = 0;
	}
	else if (newOffset.y > (scrollBounds.size.height - viewBounds.size.height))
	{
		scrollY = 0;
		newOffset.y = MAX(scrollBounds.size.height - viewBounds.size.height, 0);
	}

	// perform scrolling
	[_session_scrollview setContentOffset:newOffset];

	// continue scrolling?
	if (scrollX != 0 || scrollY != 0)
		[self performSelector:@selector(doAutoScrolling)
		           withObject:nil
		           afterDelay:AUTOSCROLLTIMEOUT];
	else
		_is_autoscrolling = NO;
}

// callback for a right click action
- (void)touchPointerMove:(CGPoint)pos
{
	CGPoint session_view_pos = [_touchpointer_view convertPoint:pos toView:_session_view];
	[self handleMouseMoveForPosition:session_view_pos];

	if (_autoscroll_with_touchpointer && !_is_autoscrolling)
	{
		_is_autoscrolling = YES;
		[self performSelector:@selector(doAutoScrolling)
		           withObject:nil
		           afterDelay:AUTOSCROLLTIMEOUT];
	}
}

// callback if scrolling is performed
- (void)touchPointerScrollDown:(BOOL)down
{
	[_session sendInputEvent:[self eventDescriptorForMouseEvent:GetMouseWheelEvent(down)
	                                                   position:CGPointZero]];
}

// callback for toggling the standard keyboard
- (void)touchPointerToggleKeyboard
{
	if (_advanced_keyboard_visible)
		[self toggleKeyboardWhenOtherVisible:nil];
	else
		[self toggleKeyboard:nil];
}

// callback for toggling the extended keyboard
- (void)touchPointerToggleExtendedKeyboard
{
	[self toggleExtKeyboard:nil];
}

// callback for reset view
- (void)touchPointerResetSessionView
{
	[_session_scrollview setZoomScale:1.0 animated:YES];
}

@end

@implementation RDPSessionViewController (Private)

#pragma mark -
#pragma mark Helper functions

- (void)showSessionToolbar:(BOOL)show
{
	// already shown or hidden?
	if (_session_toolbar_visible == show)
		return;

	if (show)
	{
		[UIView beginAnimations:@"showToolbar" context:nil];
		[UIView setAnimationDuration:.4];
		[UIView setAnimationCurve:UIViewAnimationCurveLinear];
		[_session_toolbar
		    setFrame:CGRectMake(0.0, 0.0, [[self view] bounds].size.width, TOOLBAR_HEIGHT)];
		[UIView commitAnimations];
		_session_toolbar_visible = YES;
	}
	else
	{
		[UIView beginAnimations:@"hideToolbar" context:nil];
		[UIView setAnimationDuration:.4];
		[UIView setAnimationCurve:UIViewAnimationCurveLinear];
		[_session_toolbar setFrame:CGRectMake(0.0, -TOOLBAR_HEIGHT, [[self view] bounds].size.width,
		                                      TOOLBAR_HEIGHT)];
		[UIView commitAnimations];
		_session_toolbar_visible = NO;
	}
}

- (UIToolbar *)keyboardToolbar
{
	UIToolbar *keyboard_toolbar = [[[UIToolbar alloc] initWithFrame:CGRectNull] autorelease];
	[keyboard_toolbar setBarStyle:UIBarStyleBlackOpaque];

	UIBarButtonItem *esc_btn =
	    [[[UIBarButtonItem alloc] initWithTitle:@"Esc"
	                                      style:UIBarButtonItemStyleBordered
	                                     target:self
	                                     action:@selector(pressEscKey:)] autorelease];
	UIImage *win_icon =
	    [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"toolbar_icon_win"
	                                                                     ofType:@"png"]];
	UIBarButtonItem *win_btn =
	    [[[UIBarButtonItem alloc] initWithImage:win_icon
	                                      style:UIBarButtonItemStyleBordered
	                                     target:self
	                                     action:@selector(toggleWinKey:)] autorelease];
	UIBarButtonItem *ctrl_btn =
	    [[[UIBarButtonItem alloc] initWithTitle:@"Ctrl"
	                                      style:UIBarButtonItemStyleBordered
	                                     target:self
	                                     action:@selector(toggleCtrlKey:)] autorelease];
	UIBarButtonItem *alt_btn =
	    [[[UIBarButtonItem alloc] initWithTitle:@"Alt"
	                                      style:UIBarButtonItemStyleBordered
	                                     target:self
	                                     action:@selector(toggleAltKey:)] autorelease];
	UIBarButtonItem *ext_btn = [[[UIBarButtonItem alloc]
	    initWithTitle:@"Ext"
	            style:UIBarButtonItemStyleBordered
	           target:self
	           action:@selector(toggleKeyboardWhenOtherVisible:)] autorelease];
	UIBarButtonItem *done_btn = [[[UIBarButtonItem alloc]
	    initWithBarButtonSystemItem:UIBarButtonSystemItemDone
	                         target:self
	                         action:@selector(toggleKeyboard:)] autorelease];
	UIBarButtonItem *flex_spacer =
	    [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace
	                                                   target:nil
	                                                   action:nil] autorelease];

	// iPad gets a shift button, iphone doesn't (there's just not enough space ...)
	NSArray *items;
	if (IsPad())
	{
		UIBarButtonItem *shift_btn =
		    [[[UIBarButtonItem alloc] initWithTitle:@"Shift"
		                                      style:UIBarButtonItemStyleBordered
		                                     target:self
		                                     action:@selector(toggleShiftKey:)] autorelease];
		items = [NSArray arrayWithObjects:esc_btn, flex_spacer, shift_btn, flex_spacer, ctrl_btn,
		                                  flex_spacer, win_btn, flex_spacer, alt_btn, flex_spacer,
		                                  ext_btn, flex_spacer, done_btn, nil];
	}
	else
	{
		items = [NSArray arrayWithObjects:esc_btn, flex_spacer, ctrl_btn, flex_spacer, win_btn,
		                                  flex_spacer, alt_btn, flex_spacer, ext_btn, flex_spacer,
		                                  done_btn, nil];
	}

	[keyboard_toolbar setItems:items];
	[keyboard_toolbar sizeToFit];
	return keyboard_toolbar;
}

- (void)initGestureRecognizers
{
	// single and double tap recognizer
	UITapGestureRecognizer *doubleTapRecognizer =
	    [[[UITapGestureRecognizer alloc] initWithTarget:self
	                                             action:@selector(handleDoubleTap:)] autorelease];
	[doubleTapRecognizer setNumberOfTouchesRequired:1];
	[doubleTapRecognizer setNumberOfTapsRequired:2];

	UITapGestureRecognizer *singleTapRecognizer =
	    [[[UITapGestureRecognizer alloc] initWithTarget:self
	                                             action:@selector(handleSingleTap:)] autorelease];
	[singleTapRecognizer requireGestureRecognizerToFail:doubleTapRecognizer];
	[singleTapRecognizer setNumberOfTouchesRequired:1];
	[singleTapRecognizer setNumberOfTapsRequired:1];

	// 2 fingers - tap recognizer
	UITapGestureRecognizer *single2FingersTapRecognizer = [[[UITapGestureRecognizer alloc]
	    initWithTarget:self
	            action:@selector(handleSingle2FingersTap:)] autorelease];
	[single2FingersTapRecognizer setNumberOfTouchesRequired:2];
	[single2FingersTapRecognizer setNumberOfTapsRequired:1];

	// long press gesture recognizer
	UILongPressGestureRecognizer *longPressRecognizer = [[[UILongPressGestureRecognizer alloc]
	    initWithTarget:self
	            action:@selector(handleLongPress:)] autorelease];
	[longPressRecognizer setMinimumPressDuration:0.5];

	// double long press gesture recognizer
	UILongPressGestureRecognizer *doubleLongPressRecognizer = [[[UILongPressGestureRecognizer alloc]
	    initWithTarget:self
	            action:@selector(handleDoubleLongPress:)] autorelease];
	[doubleLongPressRecognizer setNumberOfTouchesRequired:2];
	[doubleLongPressRecognizer setMinimumPressDuration:0.5];

	// 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];

	// add gestures to scroll view
	[_session_scrollview addGestureRecognizer:singleTapRecognizer];
	[_session_scrollview addGestureRecognizer:doubleTapRecognizer];
	[_session_scrollview addGestureRecognizer:single2FingersTapRecognizer];
	[_session_scrollview addGestureRecognizer:longPressRecognizer];
	[_session_scrollview addGestureRecognizer:doubleLongPressRecognizer];
	[_session_scrollview addGestureRecognizer:single3FingersTapRecognizer];
}

- (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
{
	return [NSDictionary
	    dictionaryWithObjectsAndKeys:@"mouse", @"type", [NSNumber numberWithUnsignedShort:event],
	                                 @"flags",
	                                 [NSNumber numberWithUnsignedShort:lrintf(position.x)],
	                                 @"coord_x",
	                                 [NSNumber numberWithUnsignedShort:lrintf(position.y)],
	                                 @"coord_y", nil];
}

- (void)sendDelayedMouseEventWithTimer:(NSTimer *)timer
{
	_mouse_move_event_timer = nil;
	NSDictionary *event = [timer userInfo];
	[_session sendInputEvent:event];
	[timer autorelease];
}

- (void)handleMouseMoveForPosition:(CGPoint)position
{
	NSDictionary *event = [self eventDescriptorForMouseEvent:PTR_FLAGS_MOVE position:position];

	// cancel pending mouse move events
	[_mouse_move_event_timer invalidate];
	_mouse_move_events_skipped++;

	if (_mouse_move_events_skipped >= 5)
	{
		[_session sendInputEvent:event];
		_mouse_move_events_skipped = 0;
	}
	else
	{
		[_mouse_move_event_timer autorelease];
		_mouse_move_event_timer =
		    [[NSTimer scheduledTimerWithTimeInterval:0.05
		                                      target:self
		                                    selector:@selector(sendDelayedMouseEventWithTimer:)
		                                    userInfo:event
		                                     repeats:NO] retain];
	}
}

@end