Automatic deployment of the virtual keyboard.

ash/virtual_keyboard_controller.cc

 // Copyright 2014 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 "ash/virtual_keyboard_controller.h"
 
+#include <vector>
+
 #include "ash/shell.h"
+#include "base/command_line.h"
+#include "base/strings/string_util.h"
+#include "ui/events/device_data_manager.h"
+#include "ui/events/input_device.h"
+#include "ui/events/keyboard_device.h"
+#include "ui/events/touchscreen_device.h"
+#include "ui/gfx/x/x11_types.h"
+#include "ui/keyboard/keyboard_switches.h"
 #include "ui/keyboard/keyboard_util.h"
 
 namespace ash {
 
-VirtualKeyboardController::VirtualKeyboardController() {
-  Shell::GetInstance()->AddShellObserver(this);
+VirtualKeyboardController::VirtualKeyboardController()
+    : has_external_keyboard_(false),
+      has_internal_keyboard_(false),
+      has_touchscreen_(false) {
+  ui::DeviceDataManager::GetInstance()->AddObserver(this);
+  UpdateDevices();
+  // Do not actually create the keyboard object since Ash environment may not be
+  // ready yet.
+  keyboard::SetTouchKeyboardEnabled(ShouldShowKeyboard());
 }
 
 VirtualKeyboardController::~VirtualKeyboardController() {
-  Shell::GetInstance()->RemoveShellObserver(this);
+  ui::DeviceDataManager::GetInstance()->RemoveObserver(this);
 }
 
-void VirtualKeyboardController::OnMaximizeModeStarted() {
-  keyboard::SetTouchKeyboardEnabled(true);
-  Shell::GetInstance()->CreateKeyboard();
+// Determines the active input devices.
+void VirtualKeyboardController::UpdateDevices() {
+  ui::DeviceDataManager* device_data_manager =
+      ui::DeviceDataManager::GetInstance();
+
+  // Checks for internal touchscreens.
+  std::vector<ui::TouchscreenDevice> screens =
+      device_data_manager->touchscreen_devices();
+  has_touchscreen_ = screens.size() > 0;
+
+  // Checks for keyboards.
+  has_external_keyboard_ = false;
+  has_internal_keyboard_ = false;
+  std::vector<ui::KeyboardDevice> keyboards =
+      device_data_manager->keyboard_devices();
+  std::vector<ui::KeyboardDevice>::const_iterator iter;
+  for (iter = keyboards.begin(); iter != keyboards.end(); ++iter) {
+    ui::InputDeviceType type = (*iter).type;
+    if (type == ui::InputDeviceType::INPUT_DEVICE_INTERNAL)
+      has_internal_keyboard_ = true;
+    if (type == ui::InputDeviceType::INPUT_DEVICE_EXTERNAL)
+      has_external_keyboard_ = true;
+  }
 }
 
-void VirtualKeyboardController::OnMaximizeModeEnded() {
-  keyboard::SetTouchKeyboardEnabled(false);
-  if (!keyboard::IsKeyboardEnabled())
-    Shell::GetInstance()->DeactivateKeyboard();
+// Updates the virtual keyboard state.
+void VirtualKeyboardController::SetKeyboardEnabled(bool enabled) {
+  keyboard::SetTouchKeyboardEnabled(enabled);
+  if (enabled) {
+    Shell::GetInstance()->CreateKeyboard();
+  } else {
+    if (!keyboard::IsKeyboardEnabled())
+      Shell::GetInstance()->DeactivateKeyboard();
+  }
+}
+
+// Whether the keyboard should be shown.
+bool VirtualKeyboardController::ShouldShowKeyboard() {
+  // If flag to autodetect is not set, we will always deploy the keyboard on
+  // maximize mode, and always dismiss it otherwise.
+  if (!CommandLine::ForCurrentProcess()->HasSwitch(
+          keyboard::switches::kAutoVirtualKeyboard)) {
+    return !has_internal_keyboard_;
+  }
+  // TODO(rsadam@): Add logic for a repressed keyboard. For now just enable the
+  // keyboard.
+  return !has_internal_keyboard_ && has_touchscreen_;
+}
+
+void VirtualKeyboardController::OnTouchscreenDeviceConfigurationChanged() {
+  UpdateDevices();
+  SetKeyboardEnabled(ShouldShowKeyboard());
+}
+
+void VirtualKeyboardController::OnKeyboardDeviceConfigurationChanged() {
+  UpdateDevices();
+  SetKeyboardEnabled(ShouldShowKeyboard());
 }
 
 }  // namespace ash