Only block internal touchpad and allow external mice to continue working in maximize mode.

BUG=362881
TEST=Manual, plug in an external mouse and observe it continues working when device is in maximize mode while internal touchpad does not.

Review URL: https://codereview.chromium.org/269633005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272254 0039d316-1c4b-4281-b951-d872f2087c98

8 files changed, 230 insertions, 13 deletions

diff --git a/ash/ash.gyp b/ash/ash.gyp
index c463286..6d8fece 100644
--- a/ash/ash.gyp
+++ b/ash/ash.gyp
@@ -574,6 +574,9 @@
         'wm/lock_state_controller.cc',
         'wm/lock_state_controller.h',
         'wm/lock_state_observer.h',
+        'wm/maximize_mode/internal_input_device_list.h',
+        'wm/maximize_mode/internal_input_device_list_x11.cc',
+        'wm/maximize_mode/internal_input_device_list_x11.h',
         'wm/maximize_mode/maximize_mode_controller.cc',
         'wm/maximize_mode/maximize_mode_controller.h',
         'wm/maximize_mode/maximize_mode_event_blocker.cc',
diff --git a/ash/wm/maximize_mode/internal_input_device_list.h b/ash/wm/maximize_mode/internal_input_device_list.h
new file mode 100644
index 0000000..ab8c86b
--- /dev/null
+++ b/ash/wm/maximize_mode/internal_input_device_list.h
@@ -0,0 +1,32 @@
+// 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.
+
+#ifndef ASH_WM_MAXIMIZE_MODE_INTERNAL_INPUT_DEVICE_LIST_H_
+#define ASH_WM_MAXIMIZE_MODE_INTERNAL_INPUT_DEVICE_LIST_H_
+
+#include "ash/ash_export.h"
+#include "base/macros.h"
+
+namespace ui {
+class Event;
+}
+
+namespace ash {
+
+// Identifies which input devices are internal and provides a helper function to
+// test if an input event came from an internal device.
+class ASH_EXPORT InternalInputDeviceList {
+ public:
+  InternalInputDeviceList() {}
+  virtual ~InternalInputDeviceList() {}
+
+  virtual bool IsEventFromInternalDevice(const ui::Event* event) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(InternalInputDeviceList);
+};
+
+}  // namespace ash
+
+#endif  // ASH_WM_MAXIMIZE_MODE_INTERNAL_INPUT_DEVICE_LIST_H_
diff --git a/ash/wm/maximize_mode/internal_input_device_list_x11.cc b/ash/wm/maximize_mode/internal_input_device_list_x11.cc
new file mode 100644
index 0000000..9a490ec
--- /dev/null
+++ b/ash/wm/maximize_mode/internal_input_device_list_x11.cc
@@ -0,0 +1,55 @@
+// 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/wm/maximize_mode/internal_input_device_list_x11.h"
+
+#include <X11/extensions/XInput2.h>
+#include <X11/Xlib.h>
+
+#include "base/strings/string_util.h"
+#include "ui/events/event.h"
+#include "ui/events/x/device_data_manager.h"
+#include "ui/events/x/device_list_cache_x.h"
+#include "ui/gfx/x/x11_types.h"
+
+namespace ash {
+
+namespace {
+
+// The name of the xinput device corresponding to the internal touchpad.
+const char kInternalTouchpadName[] = "Elan Touchpad";
+
+// The name of the xinput device corresponding to the internal keyboard.
+const char kInternalKeyboardName[] = "AT Translated Set 2 keyboard";
+
+}  // namespace
+
+InternalInputDeviceListX11::InternalInputDeviceListX11() {
+  if (ui::DeviceDataManager::GetInstance()->IsXInput2Available()) {
+    XIDeviceList xi_dev_list = ui::DeviceListCacheX::GetInstance()->
+        GetXI2DeviceList(gfx::GetXDisplay());
+    for (int i = 0; i < xi_dev_list.count; ++i) {
+      std::string device_name(xi_dev_list[i].name);
+      base::TrimWhitespaceASCII(device_name, base::TRIM_TRAILING, &device_name);
+      if (device_name == kInternalTouchpadName ||
+          device_name == kInternalKeyboardName)
+        internal_device_ids_.insert(xi_dev_list[i].deviceid);
+    }
+  }
+}
+
+InternalInputDeviceListX11::~InternalInputDeviceListX11() {
+}
+
+bool InternalInputDeviceListX11::IsEventFromInternalDevice(
+    const ui::Event* event) {
+  if (!event->HasNativeEvent())
+    return false;
+  XIDeviceEvent* xiev = static_cast<XIDeviceEvent*>(
+      event->native_event()->xcookie.data);
+  return internal_device_ids_.find(xiev->sourceid) !=
+      internal_device_ids_.end();
+}
+
+}  // namespace ash
diff --git a/ash/wm/maximize_mode/internal_input_device_list_x11.h b/ash/wm/maximize_mode/internal_input_device_list_x11.h
new file mode 100644
index 0000000..3ef0de8
--- /dev/null
+++ b/ash/wm/maximize_mode/internal_input_device_list_x11.h
@@ -0,0 +1,38 @@
+// 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.
+
+#ifndef ASH_WM_MAXIMIZE_MODE_INTERNAL_INPUT_DEVICE_LIST_X11_H_
+#define ASH_WM_MAXIMIZE_MODE_INTERNAL_INPUT_DEVICE_LIST_X11_H_
+
+#include <set>
+
+#include "ash/wm/maximize_mode/internal_input_device_list.h"
+#include "base/macros.h"
+
+namespace ui {
+class Event;
+}
+
+namespace ash {
+
+// Identifies which input devices are internal and provides a helper function to
+// test if an input event came from an internal device.
+class InternalInputDeviceListX11 : public InternalInputDeviceList {
+ public:
+  InternalInputDeviceListX11();
+  virtual ~InternalInputDeviceListX11();
+
+  // InternalInputDeviceList:
+  virtual bool IsEventFromInternalDevice(const ui::Event* event) OVERRIDE;
+
+ private:
+  // Tracks the device ids of internal input devices.
+  std::set<int> internal_device_ids_;
+
+  DISALLOW_COPY_AND_ASSIGN(InternalInputDeviceListX11);
+};
+
+}  // namespace ash
+
+#endif  // ASH_WM_MAXIMIZE_MODE_INTERNAL_INPUT_DEVICE_LIST_X11_H_
diff --git a/ash/wm/maximize_mode/maximize_mode_controller.h b/ash/wm/maximize_mode/maximize_mode_controller.h
index 6363211..4d19dcc 100644
--- a/ash/wm/maximize_mode/maximize_mode_controller.h
+++ b/ash/wm/maximize_mode/maximize_mode_controller.h
@@ -17,6 +17,7 @@ class EventHandler;
 
 namespace ash {
 
+class MaximizeModeControllerTest;
 class MaximizeModeEventBlocker;
 
 // MaximizeModeController listens to accelerometer events and automatically
@@ -53,6 +54,8 @@ class ASH_EXPORT MaximizeModeController : public AccelerometerObserver {
                                       const gfx::Vector3dF& lid) OVERRIDE;
 
  private:
+  friend class MaximizeModeControllerTest;
+
   // Detect hinge rotation from |base| and |lid| accelerometers and
   // automatically start / stop maximize mode.
   void HandleHingeRotation(const gfx::Vector3dF& base,
diff --git a/ash/wm/maximize_mode/maximize_mode_controller_unittest.cc b/ash/wm/maximize_mode/maximize_mode_controller_unittest.cc
index 5509107..4145281 100644
--- a/ash/wm/maximize_mode/maximize_mode_controller_unittest.cc
+++ b/ash/wm/maximize_mode/maximize_mode_controller_unittest.cc
@@ -14,6 +14,8 @@
 #include "ash/test/test_screenshot_delegate.h"
 #include "ash/test/test_system_tray_delegate.h"
 #include "ash/test/test_volume_control_delegate.h"
+#include "ash/wm/maximize_mode/internal_input_device_list.h"
+#include "ash/wm/maximize_mode/maximize_mode_event_blocker.h"
 #include "ui/aura/test/event_generator.h"
 #include "ui/events/event_handler.h"
 #include "ui/gfx/vector3d_f.h"
@@ -58,6 +60,21 @@ void EventCounter::OnEvent(ui::Event* event) {
   event_count_++;
 }
 
+// A test internal input device list which pretends that all events are from
+// internal devices to allow verifying that the event blocking works.
+class TestInternalInputDeviceList : public InternalInputDeviceList {
+ public:
+  TestInternalInputDeviceList() {}
+  virtual ~TestInternalInputDeviceList() {}
+
+  virtual bool IsEventFromInternalDevice(const ui::Event* event) OVERRIDE {
+    return true;
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TestInternalInputDeviceList);
+};
+
 }  // namespace
 
 // Test accelerometer data taken with the lid at less than 180 degrees while
@@ -109,6 +126,13 @@ class MaximizeModeControllerTest : public test::AshTestBase {
     return Shell::GetInstance()->IsMaximizeModeWindowManagerEnabled();
   }
 
+  // Overrides the internal input device list for the current event targeters
+  // with one which always returns true.
+  void InstallTestInternalDeviceList() {
+    maximize_mode_controller()->event_blocker_->internal_devices_.reset(
+        new TestInternalInputDeviceList);
+  }
+
   gfx::Display::Rotation GetInternalDisplayRotation() const {
     return Shell::GetInstance()->display_manager()->GetDisplayInfo(
         gfx::Display::InternalDisplayId()).rotation();
@@ -326,6 +350,7 @@ TEST_F(MaximizeModeControllerTest, BlocksKeyboardAndMouse) {
   TriggerAccelerometerUpdate(gfx::Vector3dF(0.0f, 0.0f, 1.0f),
                              gfx::Vector3dF(1.0f, 0.0f, 0.0f));
   ASSERT_TRUE(IsMaximizeModeStarted());
+  InstallTestInternalDeviceList();
 
   event_generator.PressKey(ui::VKEY_ESCAPE, 0);
   event_generator.ReleaseKey(ui::VKEY_ESCAPE, 0);
diff --git a/ash/wm/maximize_mode/maximize_mode_event_blocker.cc b/ash/wm/maximize_mode/maximize_mode_event_blocker.cc
index fd2362f..572886c 100644
--- a/ash/wm/maximize_mode/maximize_mode_event_blocker.cc
+++ b/ash/wm/maximize_mode/maximize_mode_event_blocker.cc
@@ -5,10 +5,18 @@
 #include "ash/wm/maximize_mode/maximize_mode_event_blocker.h"
 
 #include "ash/shell.h"
+#include "ash/wm/maximize_mode/internal_input_device_list.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/aura/client/cursor_client.h"
+#include "ui/aura/window_event_dispatcher.h"
+#include "ui/aura/window_tree_host.h"
 #include "ui/events/event_targeter.h"
 #include "ui/events/keycodes/keyboard_codes.h"
+#include "ui/gfx/point.h"
+
+#if defined(USE_X11)
+#include "ash/wm/maximize_mode/internal_input_device_list_x11.h"
+#endif
 
 namespace ash {
 
@@ -17,11 +25,11 @@ namespace {
 // Event targeter to prevent delivery of mouse and touchpad events while
 // maximize mode is active. Other events such as touch are passed on to the
 // default targeter.
-// TODO(flackr): This should only stop events from the internal keyboard and
-// touchpad.
 class BlockKeyboardAndTouchpadTargeter : public ui::EventTargeter {
  public:
-  BlockKeyboardAndTouchpadTargeter();
+  BlockKeyboardAndTouchpadTargeter(
+      aura::Window* root_window,
+      MaximizeModeEventBlocker* event_blocker);
   virtual ~BlockKeyboardAndTouchpadTargeter();
 
   // Sets the default targeter to use when the event is not being blocked.
@@ -32,16 +40,34 @@ class BlockKeyboardAndTouchpadTargeter : public ui::EventTargeter {
                                               ui::Event* event) OVERRIDE;
 
  private:
+  // A weak pointer to the root window on which this targeter will be set. The
+  // root window owns this targeter.
+  aura::Window* root_window_;
+
+  // A weak pointer to the event blocker which owns the scoped targeter owning
+  // this targeter.
+  MaximizeModeEventBlocker* event_blocker_;
+
   // A weak pointer to the targeter this targeter is wrapping. The
   // default_targeter is owned by the ScopedWindowTargeter which will be valid
   // as long as this targeter is alive.
   ui::EventTargeter* default_targeter_;
 
+  // The last known mouse location to lock the cursor in place to when events
+  // come from the internal touchpad.
+  gfx::Point last_mouse_location_;
+
   DISALLOW_COPY_AND_ASSIGN(BlockKeyboardAndTouchpadTargeter);
 };
 
-BlockKeyboardAndTouchpadTargeter::BlockKeyboardAndTouchpadTargeter()
-    : default_targeter_(NULL) {
+BlockKeyboardAndTouchpadTargeter::BlockKeyboardAndTouchpadTargeter(
+    aura::Window* root_window,
+    MaximizeModeEventBlocker* event_blocker)
+    : root_window_(root_window),
+      event_blocker_(event_blocker),
+      default_targeter_(NULL),
+      last_mouse_location_(root_window->GetHost()->dispatcher()->
+          GetLastMouseLocationInRoot()) {
 }
 
 BlockKeyboardAndTouchpadTargeter::~BlockKeyboardAndTouchpadTargeter() {
@@ -55,19 +81,37 @@ void BlockKeyboardAndTouchpadTargeter::SetDefaultTargeter(
 ui::EventTarget* BlockKeyboardAndTouchpadTargeter::FindTargetForEvent(
     ui::EventTarget* root,
     ui::Event* event) {
-  if (event->IsMouseEvent() ||
-      event->IsMouseWheelEvent() ||
-      event->IsScrollEvent()) {
+  bool internal_device = event_blocker_->internal_devices() &&
+      event_blocker_->internal_devices()->IsEventFromInternalDevice(event);
+  if (event->IsMouseEvent()) {
+    if (internal_device) {
+      // The cursor movement is handled at a lower level which is not blocked.
+      // Move the mouse cursor back to its last known location resulting from
+      // an external mouse to prevent the internal touchpad from moving it.
+      root_window_->GetHost()->MoveCursorToHostLocation(
+          last_mouse_location_);
+      return NULL;
+    } else {
+      // Track the last location seen from an external mouse event.
+      last_mouse_location_ =
+          static_cast<ui::MouseEvent*>(event)->root_location();
+      root_window_->GetHost()->ConvertPointToHost(&last_mouse_location_);
+    }
+  } else if (internal_device && (event->IsMouseWheelEvent() ||
+                                 event->IsScrollEvent())) {
     return NULL;
-  }
-  if (event->IsKeyEvent() && event->HasNativeEvent()) {
+  } else if (event->IsKeyEvent() && event->HasNativeEvent()) {
+    // TODO(flackr): Disable events only from the internal keyboard device
+    // when we begin using XI2 events for keyboard events
+    // (http://crbug.com/368750) and can tell which device the event is
+    // coming from, http://crbug.com/362881.
     // TODO(bruthig): Fix this to block rewritten volume keys
     // (i.e. F9 and F10)  from the device's keyboard. https://crbug.com/368669
     ui::KeyEvent* key_event = static_cast<ui::KeyEvent*>(event);
     if (key_event->key_code() != ui::VKEY_VOLUME_DOWN &&
         key_event->key_code() != ui::VKEY_VOLUME_UP
 #if defined(OS_CHROMEOS)
-        && key_event->key_code() != ui::VKEY_POWER
+      && key_event->key_code() != ui::VKEY_POWER
 #endif
         ) {
       return NULL;
@@ -78,7 +122,11 @@ ui::EventTarget* BlockKeyboardAndTouchpadTargeter::FindTargetForEvent(
 
 }  // namespace
 
-MaximizeModeEventBlocker::MaximizeModeEventBlocker() {
+MaximizeModeEventBlocker::MaximizeModeEventBlocker()
+#if defined(USE_X11)
+    : internal_devices_(new InternalInputDeviceListX11)
+#endif
+    {
   Shell::GetInstance()->AddShellObserver(this);
 
   // Hide the cursor as mouse events will be blocked.
@@ -107,7 +155,7 @@ void MaximizeModeEventBlocker::OnRootWindowAdded(aura::Window* root_window) {
 void MaximizeModeEventBlocker::AddEventTargeterOn(
     aura::Window* root_window) {
   BlockKeyboardAndTouchpadTargeter* targeter =
-      new BlockKeyboardAndTouchpadTargeter();
+      new BlockKeyboardAndTouchpadTargeter(root_window, this);
   aura::ScopedWindowTargeter* scoped_targeter = new aura::ScopedWindowTargeter(
       root_window, scoped_ptr<ui::EventTargeter>(targeter));
   targeter->SetDefaultTargeter(scoped_targeter->old_targeter());
diff --git a/ash/wm/maximize_mode/maximize_mode_event_blocker.h b/ash/wm/maximize_mode/maximize_mode_event_blocker.h
index 9e4a1a0..4f7fae7 100644
--- a/ash/wm/maximize_mode/maximize_mode_event_blocker.h
+++ b/ash/wm/maximize_mode/maximize_mode_event_blocker.h
@@ -5,8 +5,11 @@
 #ifndef ASH_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_EVENT_BLOCKER_H_
 #define ASH_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_EVENT_BLOCKER_H_
 
+#include <set>
+
 #include "ash/shell_observer.h"
 #include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "ui/aura/scoped_window_targeter.h"
 
@@ -16,6 +19,9 @@ class Window;
 
 namespace ash {
 
+class InternalInputDeviceList;
+class MaximizeModeControllerTest;
+
 // A class which blocks mouse and keyboard events while instantiated by
 // replacing the root window event targeter.
 class MaximizeModeEventBlocker : public ShellObserver {
@@ -23,14 +29,21 @@ class MaximizeModeEventBlocker : public ShellObserver {
   MaximizeModeEventBlocker();
   virtual ~MaximizeModeEventBlocker();
 
+  InternalInputDeviceList* internal_devices() {
+    return internal_devices_.get();
+  }
+
   // ShellObserver:
   virtual void OnRootWindowAdded(aura::Window* root_window) OVERRIDE;
 
  private:
+  friend class MaximizeModeControllerTest;
+
   // Adds an event targeter on |root_window| to block mouse and keyboard events.
   void AddEventTargeterOn(aura::Window* root_window);
 
   ScopedVector<aura::ScopedWindowTargeter> targeters_;
+  scoped_ptr<InternalInputDeviceList> internal_devices_;
 
   DISALLOW_COPY_AND_ASSIGN(MaximizeModeEventBlocker);
 };