1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "ash/wm/maximize_mode/maximize_mode_controller.h"
7 #include "ash/accelerators/accelerator_controller.h"
8 #include "ash/accelerators/accelerator_table.h"
9 #include "ash/accelerometer/accelerometer_controller.h"
10 #include "ash/ash_switches.h"
11 #include "ash/display/display_manager.h"
12 #include "ash/shell.h"
13 #include "ash/wm/maximize_mode/maximize_mode_event_blocker.h"
14 #include "ash/wm/maximize_mode/maximize_mode_window_manager.h"
15 #include "base/auto_reset.h"
16 #include "base/command_line.h"
17 #include "base/metrics/histogram.h"
18 #include "ui/base/accelerators/accelerator.h"
19 #include "ui/events/event.h"
20 #include "ui/events/event_handler.h"
21 #include "ui/events/keycodes/keyboard_codes.h"
22 #include "ui/gfx/vector3d_f.h"
28 // The hinge angle at which to enter maximize mode.
29 const float kEnterMaximizeModeAngle = 200.0f;
31 // The angle at which to exit maximize mode, this is specifically less than the
32 // angle to enter maximize mode to prevent rapid toggling when near the angle.
33 const float kExitMaximizeModeAngle = 160.0f;
35 // When the lid is fully open 360 degrees, the accelerometer readings can
36 // occasionally appear as though the lid is almost closed. If the lid appears
37 // near closed but the device is on we assume it is an erroneous reading from
38 // it being open 360 degrees.
39 const float kFullyOpenAngleErrorTolerance = 20.0f;
41 // When the device approaches vertical orientation (i.e. portrait orientation)
42 // the accelerometers for the base and lid approach the same values (i.e.
43 // gravity pointing in the direction of the hinge). When this happens we cannot
44 // compute the hinge angle reliably and must turn ignore accelerometer readings.
45 // This is the minimum acceleration perpendicular to the hinge under which to
46 // detect hinge angle.
47 const float kHingeAngleDetectionThreshold = 0.25f;
49 // The maximum deviation from the acceleration expected due to gravity under
50 // which to detect hinge angle and screen rotation.
51 const float kDeviationFromGravityThreshold = 0.1f;
53 // The maximum deviation between the magnitude of the two accelerometers under
54 // which to detect hinge angle and screen rotation. These accelerometers are
55 // attached to the same physical device and so should be under the same
57 const float kNoisyMagnitudeDeviation = 0.1f;
59 // The angle which the screen has to be rotated past before the display will
60 // rotate to match it (i.e. 45.0f is no stickiness).
61 const float kDisplayRotationStickyAngleDegrees = 60.0f;
63 // The minimum acceleration in a direction required to trigger screen rotation.
64 // This prevents rapid toggling of rotation when the device is near flat and
65 // there is very little screen aligned force on it. The value is effectively the
66 // sine of the rise angle required, with the current value requiring at least a
68 const float kMinimumAccelerationScreenRotation = 0.42f;
70 const float kRadiansToDegrees = 180.0f / 3.14159265f;
72 // Returns the angle between |base| and |other| in degrees.
73 float AngleBetweenVectorsInDegrees(const gfx::Vector3dF& base,
74 const gfx::Vector3dF& other) {
75 return acos(gfx::DotProduct(base, other) /
76 base.Length() / other.Length()) * kRadiansToDegrees;
79 // Returns the clockwise angle between |base| and |other| where |normal| is the
80 // normal of the virtual surface to measure clockwise according to.
81 float ClockwiseAngleBetweenVectorsInDegrees(const gfx::Vector3dF& base,
82 const gfx::Vector3dF& other,
83 const gfx::Vector3dF& normal) {
84 float angle = AngleBetweenVectorsInDegrees(base, other);
85 gfx::Vector3dF cross(base);
87 // If the dot product of this cross product is normal, it means that the
88 // shortest angle between |base| and |other| was counterclockwise with respect
89 // to the surface represented by |normal| and this angle must be reversed.
90 if (gfx::DotProduct(cross, normal) > 0.0f)
91 angle = 360.0f - angle;
95 #if defined(OS_CHROMEOS)
97 // An event handler which listens for a volume down + power keypress and
98 // triggers a screenshot when this is seen.
99 class ScreenshotActionHandler : public ui::EventHandler {
101 ScreenshotActionHandler();
102 virtual ~ScreenshotActionHandler();
105 virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
108 bool volume_down_pressed_;
110 DISALLOW_COPY_AND_ASSIGN(ScreenshotActionHandler);
113 ScreenshotActionHandler::ScreenshotActionHandler()
114 : volume_down_pressed_(false) {
115 Shell::GetInstance()->PrependPreTargetHandler(this);
118 ScreenshotActionHandler::~ScreenshotActionHandler() {
119 Shell::GetInstance()->RemovePreTargetHandler(this);
122 void ScreenshotActionHandler::OnKeyEvent(ui::KeyEvent* event) {
123 if (event->key_code() == ui::VKEY_VOLUME_DOWN) {
124 volume_down_pressed_ = event->type() == ui::ET_KEY_PRESSED ||
125 event->type() == ui::ET_TRANSLATED_KEY_PRESS;
126 } else if (volume_down_pressed_ &&
127 event->key_code() == ui::VKEY_POWER &&
128 event->type() == ui::ET_KEY_PRESSED) {
129 Shell::GetInstance()->accelerator_controller()->PerformAction(
130 ash::TAKE_SCREENSHOT, ui::Accelerator());
134 #endif // OS_CHROMEOS
138 MaximizeModeController::MaximizeModeController()
139 : rotation_locked_(false),
140 have_seen_accelerometer_data_(false),
141 in_set_screen_rotation_(false),
142 user_rotation_(gfx::Display::ROTATE_0),
143 last_touchview_transition_time_(base::Time::Now()) {
144 Shell::GetInstance()->accelerometer_controller()->AddObserver(this);
145 Shell::GetInstance()->AddShellObserver(this);
148 MaximizeModeController::~MaximizeModeController() {
149 Shell::GetInstance()->RemoveShellObserver(this);
150 Shell::GetInstance()->accelerometer_controller()->RemoveObserver(this);
153 void MaximizeModeController::SetRotationLocked(bool rotation_locked) {
154 if (rotation_locked_ == rotation_locked)
156 rotation_locked_ = rotation_locked;
157 FOR_EACH_OBSERVER(Observer, observers_,
158 OnRotationLockChanged(rotation_locked_));
161 void MaximizeModeController::AddObserver(Observer* observer) {
162 observers_.AddObserver(observer);
165 void MaximizeModeController::RemoveObserver(Observer* observer) {
166 observers_.RemoveObserver(observer);
169 bool MaximizeModeController::CanEnterMaximizeMode() {
170 // If we have ever seen accelerometer data, then HandleHingeRotation may
171 // trigger maximize mode at some point in the future.
172 // The --enable-touch-view-testing switch can also mean that we may enter
174 return have_seen_accelerometer_data_ ||
175 CommandLine::ForCurrentProcess()->HasSwitch(
176 switches::kAshEnableTouchViewTesting);
179 void MaximizeModeController::EnableMaximizeModeWindowManager(bool enable) {
180 if (enable && !maximize_mode_window_manager_.get()) {
181 maximize_mode_window_manager_.reset(new MaximizeModeWindowManager());
182 // TODO(jonross): Move the maximize mode notifications from ShellObserver
183 // to MaximizeModeController::Observer
184 Shell::GetInstance()->OnMaximizeModeStarted();
185 } else if (!enable && maximize_mode_window_manager_.get()) {
186 maximize_mode_window_manager_.reset();
187 Shell::GetInstance()->OnMaximizeModeEnded();
191 bool MaximizeModeController::IsMaximizeModeWindowManagerEnabled() const {
192 return maximize_mode_window_manager_.get() != NULL;
195 void MaximizeModeController::AddWindow(aura::Window* window) {
196 if (IsMaximizeModeWindowManagerEnabled())
197 maximize_mode_window_manager_->AddWindow(window);
200 void MaximizeModeController::Shutdown() {
201 maximize_mode_window_manager_.reset();
202 Shell::GetInstance()->OnMaximizeModeEnded();
205 void MaximizeModeController::OnAccelerometerUpdated(
206 const gfx::Vector3dF& base,
207 const gfx::Vector3dF& lid) {
208 have_seen_accelerometer_data_ = true;
210 // Ignore the reading if it appears unstable. The reading is considered
211 // unstable if it deviates too much from gravity and/or the magnitude of the
212 // reading from the lid differs too much from the reading from the base.
213 float base_magnitude = base.Length();
214 float lid_magnitude = lid.Length();
215 if (std::abs(base_magnitude - lid_magnitude) > kNoisyMagnitudeDeviation ||
216 std::abs(base_magnitude - 1.0f) > kDeviationFromGravityThreshold ||
217 std::abs(lid_magnitude - 1.0f) > kDeviationFromGravityThreshold) {
221 // Responding to the hinge rotation can change the maximize mode state which
222 // affects screen rotation, so we handle hinge rotation first.
223 HandleHingeRotation(base, lid);
224 HandleScreenRotation(lid);
227 void MaximizeModeController::OnDisplayConfigurationChanged() {
228 if (in_set_screen_rotation_)
230 DisplayManager* display_manager = Shell::GetInstance()->display_manager();
231 gfx::Display::Rotation user_rotation = display_manager->
232 GetDisplayInfo(gfx::Display::InternalDisplayId()).rotation();
233 if (user_rotation != current_rotation_) {
234 // A user may change other display configuration settings. When the user
235 // does change the rotation setting, then lock rotation to prevent the
236 // accelerometer from erasing their change.
237 SetRotationLocked(true);
238 user_rotation_ = user_rotation;
239 current_rotation_ = user_rotation;
243 void MaximizeModeController::HandleHingeRotation(const gfx::Vector3dF& base,
244 const gfx::Vector3dF& lid) {
245 static const gfx::Vector3dF hinge_vector(0.0f, 1.0f, 0.0f);
246 bool maximize_mode_engaged = IsMaximizeModeWindowManagerEnabled();
247 // Ignore the component of acceleration parallel to the hinge for the purposes
248 // of hinge angle calculation.
249 gfx::Vector3dF base_flattened(base);
250 gfx::Vector3dF lid_flattened(lid);
251 base_flattened.set_y(0.0f);
252 lid_flattened.set_y(0.0f);
254 // As the hinge approaches a vertical angle, the base and lid accelerometers
255 // approach the same values making any angle calculations highly inaccurate.
256 // Bail out early when it is too close.
257 if (base_flattened.Length() < kHingeAngleDetectionThreshold ||
258 lid_flattened.Length() < kHingeAngleDetectionThreshold) {
262 // Compute the angle between the base and the lid.
263 float angle = ClockwiseAngleBetweenVectorsInDegrees(base_flattened,
264 lid_flattened, hinge_vector);
266 // Toggle maximize mode on or off when corresponding thresholds are passed.
267 // TODO(flackr): Make MaximizeModeController own the MaximizeModeWindowManager
268 // such that observations of state changes occur after the change and shell
269 // has fewer states to track.
270 if (maximize_mode_engaged &&
271 angle > kFullyOpenAngleErrorTolerance &&
272 angle < kExitMaximizeModeAngle) {
274 } else if (!maximize_mode_engaged &&
275 angle > kEnterMaximizeModeAngle) {
280 void MaximizeModeController::HandleScreenRotation(const gfx::Vector3dF& lid) {
281 bool maximize_mode_engaged = IsMaximizeModeWindowManagerEnabled();
283 // TODO(jonross): track the updated rotation angle even when locked. So that
284 // when rotation lock is removed the accelerometer rotation can be applied
285 // without waiting for the next update.
286 if (!maximize_mode_engaged || rotation_locked_)
289 DisplayManager* display_manager =
290 Shell::GetInstance()->display_manager();
291 gfx::Display::Rotation current_rotation = display_manager->GetDisplayInfo(
292 gfx::Display::InternalDisplayId()).rotation();
294 // After determining maximize mode state, determine if the screen should
296 gfx::Vector3dF lid_flattened(lid.x(), lid.y(), 0.0f);
297 float lid_flattened_length = lid_flattened.Length();
298 // When the lid is close to being flat, don't change rotation as it is too
299 // sensitive to slight movements.
300 if (lid_flattened_length < kMinimumAccelerationScreenRotation)
303 // The reference vector is the angle of gravity when the device is rotated
304 // clockwise by 45 degrees. Computing the angle between this vector and
305 // gravity we can easily determine the expected display rotation.
306 static gfx::Vector3dF rotation_reference(-1.0f, 1.0f, 0.0f);
308 // Set the down vector to match the expected direction of gravity given the
309 // last configured rotation. This is used to enforce a stickiness that the
310 // user must overcome to rotate the display and prevents frequent rotations
311 // when holding the device near 45 degrees.
312 gfx::Vector3dF down(0.0f, 0.0f, 0.0f);
313 if (current_rotation == gfx::Display::ROTATE_0)
315 else if (current_rotation == gfx::Display::ROTATE_90)
317 else if (current_rotation == gfx::Display::ROTATE_180)
322 // Don't rotate if the screen has not passed the threshold.
323 if (AngleBetweenVectorsInDegrees(down, lid_flattened) <
324 kDisplayRotationStickyAngleDegrees) {
328 float angle = ClockwiseAngleBetweenVectorsInDegrees(rotation_reference,
329 lid_flattened, gfx::Vector3dF(0.0f, 0.0f, -1.0f));
331 gfx::Display::Rotation new_rotation = gfx::Display::ROTATE_90;
333 new_rotation = gfx::Display::ROTATE_0;
334 else if (angle < 180.0f)
335 new_rotation = gfx::Display::ROTATE_270;
336 else if (angle < 270.0f)
337 new_rotation = gfx::Display::ROTATE_180;
339 if (new_rotation != current_rotation)
340 SetDisplayRotation(display_manager, new_rotation);
343 void MaximizeModeController::SetDisplayRotation(
344 DisplayManager* display_manager,
345 gfx::Display::Rotation rotation) {
346 base::AutoReset<bool> auto_in_set_screen_rotation(
347 &in_set_screen_rotation_, true);
348 current_rotation_ = rotation;
349 display_manager->SetDisplayRotation(gfx::Display::InternalDisplayId(),
353 void MaximizeModeController::EnterMaximizeMode() {
354 DisplayManager* display_manager = Shell::GetInstance()->display_manager();
355 current_rotation_ = user_rotation_ = display_manager->
356 GetDisplayInfo(gfx::Display::InternalDisplayId()).rotation();
357 EnableMaximizeModeWindowManager(true);
358 event_blocker_.reset(new MaximizeModeEventBlocker);
359 #if defined(OS_CHROMEOS)
360 event_handler_.reset(new ScreenshotActionHandler);
362 Shell::GetInstance()->display_controller()->AddObserver(this);
365 void MaximizeModeController::LeaveMaximizeMode() {
366 DisplayManager* display_manager = Shell::GetInstance()->display_manager();
367 gfx::Display::Rotation current_rotation = display_manager->
368 GetDisplayInfo(gfx::Display::InternalDisplayId()).rotation();
369 if (current_rotation != user_rotation_)
370 SetDisplayRotation(display_manager, user_rotation_);
371 rotation_locked_ = false;
372 EnableMaximizeModeWindowManager(false);
373 event_blocker_.reset();
374 event_handler_.reset();
377 void MaximizeModeController::OnSuspend() {
378 RecordTouchViewStateTransition();
381 void MaximizeModeController::OnResume() {
382 last_touchview_transition_time_ = base::Time::Now();
385 // Called after maximize mode has started, windows might still animate though.
386 void MaximizeModeController::OnMaximizeModeStarted() {
387 RecordTouchViewStateTransition();
390 // Called after maximize mode has ended, windows might still be returning to
391 // their original position.
392 void MaximizeModeController::OnMaximizeModeEnded() {
393 RecordTouchViewStateTransition();
396 void MaximizeModeController::RecordTouchViewStateTransition() {
397 if (CanEnterMaximizeMode()) {
398 base::Time current_time = base::Time::Now();
399 base::TimeDelta delta = current_time - last_touchview_transition_time_;
400 if (IsMaximizeModeWindowManagerEnabled()) {
401 UMA_HISTOGRAM_LONG_TIMES("Ash.TouchView.TouchViewInactive", delta);
402 total_non_touchview_time_ += delta;
404 UMA_HISTOGRAM_LONG_TIMES("Ash.TouchView.TouchViewActive", delta);
405 total_touchview_time_ += delta;
407 last_touchview_transition_time_ = current_time;
411 void MaximizeModeController::OnAppTerminating() {
412 if (CanEnterMaximizeMode()) {
413 RecordTouchViewStateTransition();
414 UMA_HISTOGRAM_CUSTOM_COUNTS("Ash.TouchView.TouchViewActiveTotal",
415 total_touchview_time_.InMinutes(),
416 1, base::TimeDelta::FromDays(7).InMinutes(), 50);
417 UMA_HISTOGRAM_CUSTOM_COUNTS("Ash.TouchView.TouchViewInactiveTotal",
418 total_non_touchview_time_.InMinutes(),
419 1, base::TimeDelta::FromDays(7).InMinutes(), 50);
420 base::TimeDelta total_runtime = total_touchview_time_ +
421 total_non_touchview_time_;
422 if (total_runtime.InSeconds() > 0) {
423 UMA_HISTOGRAM_PERCENTAGE("Ash.TouchView.TouchViewActivePercentage",
424 100 * total_touchview_time_.InSeconds() / total_runtime.InSeconds());
427 Shell::GetInstance()->display_controller()->RemoveObserver(this);