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() {
+VirtualKeyboardController::VirtualKeyboardController()
+    : has_external_keyboard_(false),
+      has_internal_keyboard_(false),
+      has_touchscreen_(false),
+      maximized_(false) {
   Shell::GetInstance()->AddShellObserver(this);
+  ui::DeviceDataManager::GetInstance()->AddObserver(this);
+  UpdateDevices();
 }
 
 VirtualKeyboardController::~VirtualKeyboardController() {
   Shell::GetInstance()->RemoveShellObserver(this);
+  ui::DeviceDataManager::GetInstance()->RemoveObserver(this);
 }
 
 void VirtualKeyboardController::OnMaximizeModeStarted() {
-  keyboard::SetTouchKeyboardEnabled(true);
-  Shell::GetInstance()->CreateKeyboard();
+  maximized_ = true;
+  Update();
 }
 
 void VirtualKeyboardController::OnMaximizeModeEnded() {
-  keyboard::SetTouchKeyboardEnabled(false);
-  if (!keyboard::IsKeyboardEnabled())
-    Shell::GetInstance()->DeactivateKeyboard();
+  maximized_ = false;
+  Update();
+}
+
+// Traverse active devices and record the presence of a touchscreen,

[flackr, 2014/10/04 01:02:54]

nit: Suggest something that implies the subsequent update. i.e.
Determines the active input devices and triggers an update of the virtual
keyboard state based on this.

[rsadam, 2014/10/23 20:10:52]

Done.

+// external keyboards and internal keyboards.
+void VirtualKeyboardController::UpdateDevices() {
+  ui::DeviceDataManager* device_data_manager =
+      ui::DeviceDataManager::GetInstance();
+
+  // Checks for internal touchscreens.
+  has_touchscreen_ = false;
+  std::vector<ui::TouchscreenDevice> screens =
+      device_data_manager->touchscreen_devices();
+  std::vector<ui::TouchscreenDevice>::const_iterator screen_iter;
+  for (screen_iter = screens.begin();
+      screen_iter != screens.end(); ++screen_iter) {
+    if ((*screen_iter).type == ui::InputDeviceType::INTERNAL)

[flackr, 2014/10/04 01:02:54]

Why not deploy for an external touchscreen? Isn't this exactly the scenario we
want to support for chromeboxes?

[rsadam, 2014/10/23 20:10:52]

Done.

+      has_touchscreen_ = true;
+  }
+
+  // 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::INTERNAL)
+      has_internal_keyboard_ = true;
+    if (type == ui::InputDeviceType::EXTERNAL)
+      has_external_keyboard_ = true;
+  }
+
+  // Updates keyboard state.
+  Update();
+}
+
+
+// Updates the keyboard state.
+void VirtualKeyboardController::Update() {
+  // 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)) {

[flackr, 2014/10/04 01:02:54]

SetTouchKeyboardEnabled(maximized_) and early return. Avoid changing members to
things they're not to affect logic.

[rsadam, 2014/10/23 20:10:52]

Done.

+    has_touchscreen_ = true;
+    has_internal_keyboard_= true;
+  }
+
+  // If the device does not have a touchscreen, or the device has an internal
+  // keyboard and is not in TouchView mode, disable the keyboard.
+  if ((has_internal_keyboard_ && !maximized_)
+      || !has_touchscreen_) {
+    keyboard::SetTouchKeyboardEnabled(false);

[flackr, 2014/10/04 01:02:54]

Can you move these two commands to enable/disable the keyboard to a private
function like SetKeyboardEnabled(bool enabled)?

Then this entire block can change to:
SetTouchKeyboardEnabled(!has_internal_keyboard_ && has_touchscreen);

And later to:
SetTouchKeyboardEnabled(!(has_internal_keyboard_ || has_external_keyboard_) &&
has_touchscreen);

See my comment in https://codereview.chromium.org/618283003/ about making it so
that maximize mode isn't a special case.

[rsadam, 2014/10/23 20:10:52]

Done.

+    if (!keyboard::IsKeyboardEnabled())
+      Shell::GetInstance()->DeactivateKeyboard();
+  } else {
+    // TODO(rsadam@): Add logic for a repressed keyboard. For now just enable.
+    keyboard::SetTouchKeyboardEnabled(true);
+    Shell::GetInstance()->CreateKeyboard();
+  }
+}
+
+void VirtualKeyboardController::OnTouchscreenDeviceConfigurationChanged() {
+  UpdateDevices();
+}
+
+void VirtualKeyboardController::OnKeyboardDeviceConfigurationChanged() {
+  UpdateDevices();
 }
 
 }  // namespace ash