[CRD iOS] Send key events to the session.

remoting/client/input/simple_keyboard_input_strategy.cc

+// Copyright 2017 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.
+
+#include "remoting/client/input/simple_keyboard_input_strategy.h"
+
+#include "remoting/client/native_device_keymap.h"
+#include "ui/events/keycodes/dom/dom_code.h"
+
+namespace remoting {
+
+SimpleKeyboardInputStrategy::SimpleKeyboardInputStrategy(
+    ChromotingSession* input_stub)
+    : input_stub_(input_stub) {}
+
+SimpleKeyboardInputStrategy::~SimpleKeyboardInputStrategy() {}
+
+// KeyboardInputStrategy
+
+void SimpleKeyboardInputStrategy::HandleTextEvent(const std::string& text,
+                                                  uint8_t modifiers) {
+  std::queue<KeyEvent> keys = ConvertTextEvent(text, modifiers);
+  while (!keys.empty()) {
+    KeyEvent key = keys.front();
+    input_stub_->SendKeyEvent(key.keycode, key.keydown);
+    keys.pop();
+  }
+}
+
+void SimpleKeyboardInputStrategy::HandleDeleteEvent(uint8_t modifiers) {
+  std::queue<KeyEvent> keys = ConvertDeleteEvent(modifiers);
+  while (!keys.empty()) {
+    KeyEvent key = keys.front();
+    input_stub_->SendKeyEvent(0, key.keycode, key.keydown);

[Yuwei, 2017/05/15 19:38:06]

In case of the backspace key, could we just call SendKeyEvent(int, int)?

+    keys.pop();
+  }
+}
+
+// Private
+
+std::queue<KeyEvent> SimpleKeyboardInputStrategy::ConvertTextEvent(
+    const std::string& text,
+    uint8_t modifiers) {
+  std::queue<KeyEvent> keys;
+  for (size_t i = 0; i < text.size(); i++) {
+    KeycodeWithModifier keycode = AsciiToUsbKeycodeWithModifier(text.at(i));
+    if (keycode.modifier) {
+      // Key modifier press.
+      KeyEvent modifier_down;
+      modifier_down.keycode = keycode.modifier;
+      modifier_down.keydown = true;
+      keys.push(modifier_down);

[Yuwei, 2017/05/15 19:38:06]

Could you just use list-initialization, i.e. `keys.push({keycode.modifier,
true})`?

Ditto below.

[nicholss, 2017/05/15 23:06:11]

fancy!

+    }
+
+    // Key press.
+    KeyEvent key_down;
+    key_down.keycode = keycode.keycode;
+    key_down.keydown = true;
+    keys.push(key_down);
+
+    // Key release.
+    KeyEvent key_up;
+    key_up.keycode = keycode.keycode;
+    key_up.keydown = false;
+    keys.push(key_up);
+
+    if (keycode.modifier) {
+      // Key modifier release.
+      KeyEvent modifier;
+      modifier.keycode = keycode.modifier;
+      modifier.keydown = false;
+      keys.push(modifier);
+    }
+  }
+  return keys;
+}
+
+std::queue<KeyEvent> SimpleKeyboardInputStrategy::ConvertDeleteEvent(
+    uint8_t modifiers) {
+  std::queue<KeyEvent> keys;
+  // TODO(nicholss): Handle modifers.
+  // Key press.
+  KeyEvent key_down;
+  key_down.keycode = static_cast<uint32_t>(ui::DomCode::BACKSPACE);
+  key_down.keydown = true;
+  keys.push(key_down);
+
+  // Key release.
+  KeyEvent key_up;
+  key_up.keycode = static_cast<uint32_t>(ui::DomCode::BACKSPACE);
+  key_up.keydown = false;
+  keys.push(key_up);
+
+  return keys;
+}
+
+}  // namespace remoting