/*
RDP Keyboard helper
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 "RDPKeyboard.h"
#include <freerdp/locale/keyboard.h>
@interface RDPKeyboard (Private)
- (void)sendVirtualKey:(int)vKey up:(BOOL)up;
- (void)handleSpecialKey:(int)character;
- (void)handleAlphaNumChar:(int)character;
- (void)notifyDelegateModifiersChanged;
@end
@implementation RDPKeyboard
@synthesize delegate = _delegate, ctrlPressed = _ctrl_pressed, altPressed = _alt_pressed,
shiftPressed = _shift_pressed, winPressed = _win_pressed;
- (id)init
{
if ((self = [super init]) != nil)
{
[self initWithSession:nil delegate:nil];
memset(_virtual_key_map, 0, sizeof(_virtual_key_map));
memset(_unicode_map, 0, sizeof(_unicode_map));
// init vkey map - used for alpha-num characters
_virtual_key_map['0'] = VK_KEY_0;
_virtual_key_map['1'] = VK_KEY_1;
_virtual_key_map['2'] = VK_KEY_2;
_virtual_key_map['3'] = VK_KEY_3;
_virtual_key_map['4'] = VK_KEY_4;
_virtual_key_map['5'] = VK_KEY_5;
_virtual_key_map['6'] = VK_KEY_6;
_virtual_key_map['7'] = VK_KEY_7;
_virtual_key_map['8'] = VK_KEY_8;
_virtual_key_map['9'] = VK_KEY_9;
_virtual_key_map['a'] = VK_KEY_A;
_virtual_key_map['b'] = VK_KEY_B;
_virtual_key_map['c'] = VK_KEY_C;
_virtual_key_map['d'] = VK_KEY_D;
_virtual_key_map['e'] = VK_KEY_E;
_virtual_key_map['f'] = VK_KEY_F;
_virtual_key_map['g'] = VK_KEY_G;
_virtual_key_map['h'] = VK_KEY_H;
_virtual_key_map['i'] = VK_KEY_I;
_virtual_key_map['j'] = VK_KEY_J;
_virtual_key_map['k'] = VK_KEY_K;
_virtual_key_map['l'] = VK_KEY_L;
_virtual_key_map['m'] = VK_KEY_M;
_virtual_key_map['n'] = VK_KEY_N;
_virtual_key_map['o'] = VK_KEY_O;
_virtual_key_map['p'] = VK_KEY_P;
_virtual_key_map['q'] = VK_KEY_Q;
_virtual_key_map['r'] = VK_KEY_R;
_virtual_key_map['s'] = VK_KEY_S;
_virtual_key_map['t'] = VK_KEY_T;
_virtual_key_map['u'] = VK_KEY_U;
_virtual_key_map['v'] = VK_KEY_V;
_virtual_key_map['w'] = VK_KEY_W;
_virtual_key_map['x'] = VK_KEY_X;
_virtual_key_map['y'] = VK_KEY_Y;
_virtual_key_map['z'] = VK_KEY_Z;
// init scancode map - used for special characters
_unicode_map['-'] = 45;
_unicode_map['/'] = 47;
_unicode_map[':'] = 58;
_unicode_map[';'] = 59;
_unicode_map['('] = 40;
_unicode_map[')'] = 41;
_unicode_map['&'] = 38;
_unicode_map['@'] = 64;
_unicode_map['.'] = 46;
_unicode_map[','] = 44;
_unicode_map['?'] = 63;
_unicode_map['!'] = 33;
_unicode_map['\''] = 39;
_unicode_map['\"'] = 34;
_unicode_map['['] = 91;
_unicode_map[']'] = 93;
_unicode_map['{'] = 123;
_unicode_map['}'] = 125;
_unicode_map['#'] = 35;
_unicode_map['%'] = 37;
_unicode_map['^'] = 94;
_unicode_map['*'] = 42;
_unicode_map['+'] = 43;
_unicode_map['='] = 61;
_unicode_map['_'] = 95;
_unicode_map['\\'] = 92;
_unicode_map['|'] = 124;
_unicode_map['~'] = 126;
_unicode_map['<'] = 60;
_unicode_map['>'] = 62;
_unicode_map['$'] = 36;
}
return self;
}
- (void)dealloc
{
[super dealloc];
}
#pragma mark -
#pragma mark class methods
// return a keyboard instance
+ (RDPKeyboard *)getSharedRDPKeyboard
{
static RDPKeyboard *_shared_keyboard = nil;
if (_shared_keyboard == nil)
{
@synchronized(self)
{
if (_shared_keyboard == nil)
_shared_keyboard = [[RDPKeyboard alloc] init];
}
}
return _shared_keyboard;
}
// reset the keyboard instance and assign the given rdp instance
- (void)initWithSession:(RDPSession *)session delegate:(NSObject<RDPKeyboardDelegate> *)delegate
{
_alt_pressed = NO;
_ctrl_pressed = NO;
_shift_pressed = NO;
_win_pressed = NO;
_session = session;
_delegate = delegate;
}
- (void)reset
{
// reset pressed ctrl, alt, shift or win key
if (_shift_pressed)
[self toggleShiftKey];
if (_alt_pressed)
[self toggleAltKey];
if (_ctrl_pressed)
[self toggleCtrlKey];
if (_win_pressed)
[self toggleWinKey];
}
// handles button pressed input event from the iOS keyboard
// performs all conversions etc.
- (void)sendUnicode:(int)character
{
if (isalnum(character))
[self handleAlphaNumChar:character];
else
[self handleSpecialKey:character];
[self reset];
}
// send a backspace key press
- (void)sendVirtualKeyCode:(int)keyCode
{
[self sendVirtualKey:keyCode up:NO];
[self sendVirtualKey:keyCode up:YES];
}
#pragma mark modifier key handling
// toggle ctrl key, returns true if pressed, otherwise false
- (void)toggleCtrlKey
{
[self sendVirtualKey:VK_LCONTROL up:_ctrl_pressed];
_ctrl_pressed = !_ctrl_pressed;
[self notifyDelegateModifiersChanged];
}
// toggle alt key, returns true if pressed, otherwise false
- (void)toggleAltKey
{
[self sendVirtualKey:VK_LMENU up:_alt_pressed];
_alt_pressed = !_alt_pressed;
[self notifyDelegateModifiersChanged];
}
// toggle shift key, returns true if pressed, otherwise false
- (void)toggleShiftKey
{
[self sendVirtualKey:VK_LSHIFT up:_shift_pressed];
_shift_pressed = !_shift_pressed;
[self notifyDelegateModifiersChanged];
}
// toggle windows key, returns true if pressed, otherwise false
- (void)toggleWinKey
{
[self sendVirtualKey:(VK_LWIN | KBDEXT) up:_win_pressed];
_win_pressed = !_win_pressed;
[self notifyDelegateModifiersChanged];
}
#pragma mark Sending special key strokes
- (void)sendEnterKeyStroke
{
[self sendVirtualKeyCode:(VK_RETURN | KBDEXT)];
}
- (void)sendEscapeKeyStroke
{
[self sendVirtualKeyCode:VK_ESCAPE];
}
- (void)sendBackspaceKeyStroke
{
[self sendVirtualKeyCode:VK_BACK];
}
@end
#pragma mark -
@implementation RDPKeyboard (Private)
- (void)handleAlphaNumChar:(int)character
{
// if we recive an uppercase letter - make it lower and send an shift down event to server
BOOL shift_was_sent = NO;
if (isupper(character) && _shift_pressed == NO)
{
character = tolower(character);
[self sendVirtualKey:VK_LSHIFT up:NO];
shift_was_sent = YES;
}
// convert the character to a VK
int vk = _virtual_key_map[character];
if (vk != 0)
{
// send key pressed
[self sendVirtualKey:vk up:NO];
[self sendVirtualKey:vk up:YES];
}
// send the missing shift up if we had a shift down
if (shift_was_sent)
[self sendVirtualKey:VK_LSHIFT up:YES];
}
- (void)handleSpecialKey:(int)character
{
NSDictionary *eventDescriptor = nil;
if (character < 256)
{
// convert the character to a unicode character
int code = _unicode_map[character];
if (code != 0)
eventDescriptor = [NSDictionary
dictionaryWithObjectsAndKeys:@"keyboard", @"type", @"unicode", @"subtype",
[NSNumber numberWithUnsignedShort:0], @"flags",
[NSNumber numberWithUnsignedShort:code],
@"unicode_char", nil];
}
if (eventDescriptor == nil)
eventDescriptor = [NSDictionary
dictionaryWithObjectsAndKeys:@"keyboard", @"type", @"unicode", @"subtype",
[NSNumber numberWithUnsignedShort:0], @"flags",
[NSNumber numberWithUnsignedShort:character],
@"unicode_char", nil];
[_session sendInputEvent:eventDescriptor];
}
// sends the vk code to the session
- (void)sendVirtualKey:(int)vKey up:(BOOL)up
{
DWORD scancode = GetVirtualScanCodeFromVirtualKeyCode(vKey, 4);
int flags = (up ? KBD_FLAGS_RELEASE : KBD_FLAGS_DOWN);
flags |= ((scancode & KBDEXT) ? KBD_FLAGS_EXTENDED : 0);
[_session
sendInputEvent:[NSDictionary
dictionaryWithObjectsAndKeys:@"keyboard", @"type", @"scancode",
@"subtype",
[NSNumber numberWithUnsignedShort:flags],
@"flags",
[NSNumber
numberWithUnsignedShort:(scancode &
0xFF)],
@"scancode", nil]];
}
- (void)notifyDelegateModifiersChanged
{
if ([[self delegate] respondsToSelector:@selector(modifiersChangedForKeyboard:)])
[[self delegate] modifiersChangedForKeyboard:self];
}
@end