[CRD iOS] Send key events to the session.

remoting/ios/key_input.mm

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
-#import "remoting/ios/key_input.h"
-#import "remoting/ios/key_map_us.h"
-
-@interface KeyInput (Private)
-- (void)transmitAppropriateKeyCode:(NSString*)text;
-- (void)transmitKeyCode:(NSInteger)keyCode needShift:(bool)needShift;
-@end
-
-@implementation KeyInput
-
-@synthesize delegate = _delegate;
-@synthesize keyboardVisible = _keyboardVisible;
-@synthesize keyboardHeight = _keyboardHeight;
-
-// Override UIView
-- (instancetype)initWithFrame:(CGRect)frame {
-  self = [super initWithFrame:frame];
-  if (self) {
-    NSNotificationCenter* center = [NSNotificationCenter defaultCenter];
-    [center addObserver:self
-               selector:@selector(keyboardDidShow:)
-                   name:UIKeyboardDidShowNotification
-                 object:nil];
-    [center addObserver:self
-               selector:@selector(keyboardWillHide:)
-                   name:UIKeyboardWillHideNotification
-                 object:nil];
-  }
-  return self;
-}
-
-// Override NSObject
-- (void)dealloc {
-  [[NSNotificationCenter defaultCenter] removeObserver:self];
-}
-
-// Callback from NotificationCenter
-- (void)keyboardDidShow:(NSNotification*)notification {
-  NSDictionary* userInfo = [notification userInfo];
-  CGSize keyboardSize =
-      [[userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
-  _keyboardHeight = keyboardSize.height;
-  _keyboardVisible = YES;
-  [_delegate keyboardShown];
-}
-
-// Callback from NotificationCenter
-- (void)keyboardWillHide:(NSNotification*)notification {
-  _keyboardHeight = 0.0;
-  _keyboardVisible = NO;
-  [_delegate keyboardDismissed];
-}
-
-// Override UIKeyInput::UITextInputTraits property.
-- (UIKeyboardType)keyboardType {
-  return UIKeyboardTypeAlphabet;
-}
-
-// Override UIKeyInput::UITextInputTraits property.
-// Remove text completion.
-- (UITextAutocorrectionType)autocorrectionType {
-  return UITextAutocorrectionTypeNo;
-}
-
-// Override UIView::UIResponder, when this interface is the first responder
-// on-screen keyboard input will create events for Chromoting keyboard input.
-- (BOOL)canBecomeFirstResponder {
-  return YES;
-}
-
-// @protocol UIKeyInput, Send backspace.
-- (void)deleteBackward {
-  [self transmitKeyCode:kKeyCodeMetaUS[kBackspaceIndex].code needShift:false];
-}
-
-// @protocol UIKeyInput, Assume this is a text input.
-- (BOOL)hasText {
-  return YES;
-}
-
-// @protocol UIKeyInput, Translate inserted text to key presses, one char at a
-// time.
-- (void)insertText:(NSString*)text {
-  [self transmitAppropriateKeyCode:text];
-}
-
-- (void)ctrlAltDel {
-  if (_delegate) {
-    [_delegate keyboardActionKeyCode:kKeyCodeMetaUS[kCtrlIndex].code
-                           isKeyDown:YES];
-    [_delegate keyboardActionKeyCode:kKeyCodeMetaUS[kAltIndex].code
-                           isKeyDown:YES];
-    [_delegate keyboardActionKeyCode:kKeyCodeMetaUS[kDelIndex].code
-                           isKeyDown:YES];
-    [_delegate keyboardActionKeyCode:kKeyCodeMetaUS[kDelIndex].code
-                           isKeyDown:NO];
-    [_delegate keyboardActionKeyCode:kKeyCodeMetaUS[kAltIndex].code
-                           isKeyDown:NO];
-    [_delegate keyboardActionKeyCode:kKeyCodeMetaUS[kCtrlIndex].code
-                           isKeyDown:NO];
-  }
-}
-
-// When inserting multiple characters, process them one at a time.  |text| is as
-// it was output on the device.  The shift key is not naturally presented in the
-// input stream, and must be inserted by inspecting each char and considering
-// that if the key was input on a traditional keyboard that the character would
-// have required a shift.  Assume caps lock does not exist.
-- (void)transmitAppropriateKeyCode:(NSString*)text {
-  for (size_t i = 0; i < [text length]; ++i) {
-    NSInteger charToSend = [text characterAtIndex:i];
-
-    if (charToSend <= kKeyboardKeyMaxUS) {
-      [self transmitKeyCode:kKeyCodeMetaUS[charToSend].code
-                  needShift:kKeyCodeMetaUS[charToSend].needsShift];
-    }
-  }
-}
-
-// |charToSend| is as it was output on the device.  Some call this a
-// 'key press'.  For Chromoting this must be transferred as a key down (press
-// down with a finger), followed by a key up (finger is removed from the
-// keyboard).
-//
-// The delivery may be an upper case or special character.  Chromoting is just
-// interested in the button that was pushed, so to create an upper case
-// character, first send a shift press, then the button, then release shift.
-- (void)transmitKeyCode:(NSInteger)keyCode needShift:(bool)needShift {
-  if (keyCode > 0 && _delegate) {
-    if (needShift) {
-      [_delegate keyboardActionKeyCode:kKeyCodeMetaUS[kShiftIndex].code
-                             isKeyDown:YES];
-    }
-    [_delegate keyboardActionKeyCode:keyCode isKeyDown:YES];
-    [_delegate keyboardActionKeyCode:keyCode isKeyDown:NO];
-    if (needShift) {
-      [_delegate keyboardActionKeyCode:kKeyCodeMetaUS[kShiftIndex].code
-                             isKeyDown:NO];
-    }
-  }
-}
-@end