moonlight-ios/Limelight/Input/TextFieldKeyboardDelegate.m

//
//  TextFieldKeyboardDelegate.m
//  Moonlight
//
//  Created by Cameron Gutman on 3/24/20.
//  Copyright © 2020 Moonlight Game Streaming Project. All rights reserved.
//

#import "TextFieldKeyboardDelegate.h"
#import "KeyboardSupport.h"

#include <Limelight.h>

@implementation TextFieldKeyboardDelegate {
    NSDictionary<NSString *, NSNumber *> *dictCodes;
}

- (id)initWithTextField:(UITextField*)textField {
    self = [self init];
    
    [textField addTarget:self action:@selector(onKeyboardPressed:) forControlEvents:UIControlEventEditingChanged];
    
    textField.delegate = self;
    
    return self;
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    // This method is called when the "Return" key is pressed.
    LiSendKeyboardEvent(0x0d, KEY_ACTION_DOWN, 0);
    usleep(50 * 1000);
    LiSendKeyboardEvent(0x0d, KEY_ACTION_UP, 0);
    return NO;
}

- (void)onKeyboardPressed:(UITextField *)textField {
    NSString* inputText = textField.text;
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
        // If the text became empty, we know the user pressed the backspace key.
        if ([inputText isEqual:@""]) {
            LiSendKeyboardEvent(0x08, KEY_ACTION_DOWN, 0);
            usleep(50 * 1000);
            LiSendKeyboardEvent(0x08, KEY_ACTION_UP, 0);
        } else {
            // Character 0 will be our known sentinel value
            for (int i = 1; i < [inputText length]; i++) {
                struct KeyEvent event = [KeyboardSupport translateKeyEvent:[inputText characterAtIndex:i] withModifierFlags:0];
                if (event.keycode == 0) {
                    // If we don't know the code, don't send anything.
                    Log(LOG_W, @"Unknown key code: [%c]", [inputText characterAtIndex:i]);
                    continue;
                }
                [self sendLowLevelEvent:event];
            }
        }
    });
    
    // Reset text field back to known state
    textField.text = @"0";
    
    // Move the insertion point back to the end of the text box
    UITextRange *textRange = [textField textRangeFromPosition:textField.endOfDocument toPosition:textField.endOfDocument];
    [textField setSelectedTextRange:textRange];
}

- (void)specialCharPressed:(UIKeyCommand *)cmd {
    struct KeyEvent event = [KeyboardSupport translateKeyEvent:0x20 withModifierFlags:[cmd modifierFlags]];
    event.keycode = [[dictCodes valueForKey:[cmd input]] intValue];
    [self sendLowLevelEvent:event];
}

- (void)keyPressed:(UIKeyCommand *)cmd {
    struct KeyEvent event = [KeyboardSupport translateKeyEvent:[[cmd input] characterAtIndex:0] withModifierFlags:[cmd modifierFlags]];
    [self sendLowLevelEvent:event];
}

- (void)sendLowLevelEvent:(struct KeyEvent)event {
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
        // When we want to send a modified key (like uppercase letters) we need to send the
        // modifier ("shift") seperately from the key itself.
        if (event.modifier != 0) {
            LiSendKeyboardEvent(event.modifierKeycode, KEY_ACTION_DOWN, event.modifier);
        }
        LiSendKeyboardEvent(event.keycode, KEY_ACTION_DOWN, event.modifier);
        usleep(50 * 1000);
        LiSendKeyboardEvent(event.keycode, KEY_ACTION_UP, event.modifier);
        if (event.modifier != 0) {
            LiSendKeyboardEvent(event.modifierKeycode, KEY_ACTION_UP, event.modifier);
        }
    });
}

- (NSArray<UIKeyCommand *> *)keyCommands
{
    NSString *charset = @"qwertyuiopasdfghjklzxcvbnm1234567890\t§[]\\'\"/.,`<>-´ç+`¡'º;ñ= ";
    
    NSMutableArray<UIKeyCommand *> * commands = [NSMutableArray<UIKeyCommand *> array];
    dictCodes = [[NSDictionary alloc] initWithObjectsAndKeys: [NSNumber numberWithInt: 0x0d], @"\r", [NSNumber numberWithInt: 0x08], @"\b", [NSNumber numberWithInt: 0x1b], UIKeyInputEscape, [NSNumber numberWithInt: 0x28], UIKeyInputDownArrow, [NSNumber numberWithInt: 0x26], UIKeyInputUpArrow, [NSNumber numberWithInt: 0x25], UIKeyInputLeftArrow, [NSNumber numberWithInt: 0x27], UIKeyInputRightArrow, nil];
    
    [charset enumerateSubstringsInRange:NSMakeRange(0, charset.length)
                                options:NSStringEnumerationByComposedCharacterSequences
                             usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
                                 [commands addObject:[UIKeyCommand keyCommandWithInput:substring modifierFlags:0 action:@selector(keyPressed:)]];
                                 [commands addObject:[UIKeyCommand keyCommandWithInput:substring modifierFlags:UIKeyModifierShift action:@selector(keyPressed:)]];
                                 [commands addObject:[UIKeyCommand keyCommandWithInput:substring modifierFlags:UIKeyModifierControl action:@selector(keyPressed:)]];
                                 [commands addObject:[UIKeyCommand keyCommandWithInput:substring modifierFlags:UIKeyModifierAlternate action:@selector(keyPressed:)]];
                             }];
    
    for (NSString *c in [dictCodes keyEnumerator]) {
        [commands addObject:[UIKeyCommand keyCommandWithInput:c
                                                modifierFlags:0
                                                       action:@selector(specialCharPressed:)]];
        [commands addObject:[UIKeyCommand keyCommandWithInput:c
                                                modifierFlags:UIKeyModifierShift
                                                       action:@selector(specialCharPressed:)]];
        [commands addObject:[UIKeyCommand keyCommandWithInput:c
                                                modifierFlags:UIKeyModifierShift | UIKeyModifierAlternate
                                                       action:@selector(specialCharPressed:)]];
        [commands addObject:[UIKeyCommand keyCommandWithInput:c
                                                modifierFlags:UIKeyModifierShift | UIKeyModifierControl
                                                       action:@selector(specialCharPressed:)]];
        [commands addObject:[UIKeyCommand keyCommandWithInput:c
                                                modifierFlags:UIKeyModifierControl
                                                       action:@selector(specialCharPressed:)]];
        [commands addObject:[UIKeyCommand keyCommandWithInput:c
                                                modifierFlags:UIKeyModifierControl | UIKeyModifierAlternate
                                                       action:@selector(specialCharPressed:)]];
        [commands addObject:[UIKeyCommand keyCommandWithInput:c
                                                modifierFlags:UIKeyModifierAlternate
                                                       action:@selector(specialCharPressed:)]];
    }
    
    return commands;
}

@end