Updating trunk VERSION from 2139.0 to 2140.0
[chromium-blink-merge.git] / ash / wm / toplevel_window_event_handler.cc
blobce1d020d5bdf7dd2d42960438f59fef55bac1284
1 // Copyright (c) 2012 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/toplevel_window_event_handler.h"
7 #include "ash/shell.h"
8 #include "ash/wm/resize_shadow_controller.h"
9 #include "ash/wm/window_resizer.h"
10 #include "ash/wm/window_state.h"
11 #include "ash/wm/window_state_observer.h"
12 #include "ash/wm/window_util.h"
13 #include "ash/wm/wm_event.h"
14 #include "base/message_loop/message_loop.h"
15 #include "base/run_loop.h"
16 #include "ui/aura/client/cursor_client.h"
17 #include "ui/aura/env.h"
18 #include "ui/aura/window.h"
19 #include "ui/aura/window_delegate.h"
20 #include "ui/aura/window_event_dispatcher.h"
21 #include "ui/aura/window_observer.h"
22 #include "ui/aura/window_tree_host.h"
23 #include "ui/base/cursor/cursor.h"
24 #include "ui/base/hit_test.h"
25 #include "ui/base/ui_base_types.h"
26 #include "ui/events/event.h"
27 #include "ui/events/event_utils.h"
28 #include "ui/events/gestures/gesture_recognizer.h"
29 #include "ui/gfx/geometry/point_conversions.h"
30 #include "ui/gfx/screen.h"
32 namespace {
33 const double kMinHorizVelocityForWindowSwipe = 1100;
34 const double kMinVertVelocityForWindowMinimize = 1000;
37 namespace ash {
39 namespace {
41 // Returns whether |window| can be moved via a two finger drag given
42 // the hittest results of the two fingers.
43 bool CanStartTwoFingerMove(aura::Window* window,
44 int window_component1,
45 int window_component2) {
46 // We allow moving a window via two fingers when the hittest components are
47 // HTCLIENT. This is done so that a window can be dragged via two fingers when
48 // the tab strip is full and hitting the caption area is difficult. We check
49 // the window type and the state type so that we do not steal touches from the
50 // web contents.
51 if (!wm::GetWindowState(window)->IsNormalOrSnapped() ||
52 window->type() != ui::wm::WINDOW_TYPE_NORMAL) {
53 return false;
55 int component1_behavior =
56 WindowResizer::GetBoundsChangeForWindowComponent(window_component1);
57 int component2_behavior =
58 WindowResizer::GetBoundsChangeForWindowComponent(window_component2);
59 return (component1_behavior & WindowResizer::kBoundsChange_Resizes) == 0 &&
60 (component2_behavior & WindowResizer::kBoundsChange_Resizes) == 0;
63 // Returns whether |window| can be moved or resized via one finger given
64 // |window_component|.
65 bool CanStartOneFingerDrag(int window_component) {
66 return WindowResizer::GetBoundsChangeForWindowComponent(
67 window_component) != 0;
70 gfx::Point ConvertPointToParent(aura::Window* window,
71 const gfx::Point& point) {
72 gfx::Point result(point);
73 aura::Window::ConvertPointToTarget(window, window->parent(), &result);
74 return result;
77 // Returns the window component containing |event|'s location.
78 int GetWindowComponent(aura::Window* window, const ui::LocatedEvent& event) {
79 return window->delegate()->GetNonClientComponent(event.location());
82 } // namespace
84 // ScopedWindowResizer ---------------------------------------------------------
86 // Wraps a WindowResizer and installs an observer on its target window. When
87 // the window is destroyed ResizerWindowDestroyed() is invoked back on the
88 // ToplevelWindowEventHandler to clean up.
89 class ToplevelWindowEventHandler::ScopedWindowResizer
90 : public aura::WindowObserver,
91 public wm::WindowStateObserver {
92 public:
93 ScopedWindowResizer(ToplevelWindowEventHandler* handler,
94 WindowResizer* resizer);
95 virtual ~ScopedWindowResizer();
97 // Returns true if the drag moves the window and does not resize.
98 bool IsMove() const;
100 WindowResizer* resizer() { return resizer_.get(); }
102 // WindowObserver overrides:
103 virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
105 // WindowStateObserver overrides:
106 virtual void OnPreWindowStateTypeChange(wm::WindowState* window_state,
107 wm::WindowStateType type) OVERRIDE;
109 private:
110 ToplevelWindowEventHandler* handler_;
111 scoped_ptr<WindowResizer> resizer_;
113 DISALLOW_COPY_AND_ASSIGN(ScopedWindowResizer);
116 ToplevelWindowEventHandler::ScopedWindowResizer::ScopedWindowResizer(
117 ToplevelWindowEventHandler* handler,
118 WindowResizer* resizer)
119 : handler_(handler),
120 resizer_(resizer) {
121 resizer_->GetTarget()->AddObserver(this);
122 wm::GetWindowState(resizer_->GetTarget())->AddObserver(this);
125 ToplevelWindowEventHandler::ScopedWindowResizer::~ScopedWindowResizer() {
126 resizer_->GetTarget()->RemoveObserver(this);
127 wm::GetWindowState(resizer_->GetTarget())->RemoveObserver(this);
130 bool ToplevelWindowEventHandler::ScopedWindowResizer::IsMove() const {
131 return resizer_->details().bounds_change ==
132 WindowResizer::kBoundsChange_Repositions;
135 void
136 ToplevelWindowEventHandler::ScopedWindowResizer::OnPreWindowStateTypeChange(
137 wm::WindowState* window_state,
138 wm::WindowStateType old) {
139 handler_->CompleteDrag(DRAG_COMPLETE);
142 void ToplevelWindowEventHandler::ScopedWindowResizer::OnWindowDestroying(
143 aura::Window* window) {
144 DCHECK_EQ(resizer_->GetTarget(), window);
145 handler_->ResizerWindowDestroyed();
148 // ToplevelWindowEventHandler --------------------------------------------------
150 ToplevelWindowEventHandler::ToplevelWindowEventHandler()
151 : first_finger_hittest_(HTNOWHERE),
152 in_move_loop_(false),
153 in_gesture_drag_(false),
154 drag_reverted_(false),
155 destroyed_(NULL) {
156 Shell::GetInstance()->display_controller()->AddObserver(this);
159 ToplevelWindowEventHandler::~ToplevelWindowEventHandler() {
160 Shell::GetInstance()->display_controller()->RemoveObserver(this);
161 if (destroyed_)
162 *destroyed_ = true;
165 void ToplevelWindowEventHandler::OnKeyEvent(ui::KeyEvent* event) {
166 if (window_resizer_.get() && event->type() == ui::ET_KEY_PRESSED &&
167 event->key_code() == ui::VKEY_ESCAPE) {
168 CompleteDrag(DRAG_REVERT);
172 void ToplevelWindowEventHandler::OnMouseEvent(
173 ui::MouseEvent* event) {
174 if (event->handled())
175 return;
176 if ((event->flags() &
177 (ui::EF_MIDDLE_MOUSE_BUTTON | ui::EF_RIGHT_MOUSE_BUTTON)) != 0)
178 return;
180 if (in_gesture_drag_)
181 return;
183 aura::Window* target = static_cast<aura::Window*>(event->target());
184 switch (event->type()) {
185 case ui::ET_MOUSE_PRESSED:
186 HandleMousePressed(target, event);
187 break;
188 case ui::ET_MOUSE_DRAGGED:
189 HandleDrag(target, event);
190 break;
191 case ui::ET_MOUSE_CAPTURE_CHANGED:
192 case ui::ET_MOUSE_RELEASED:
193 HandleMouseReleased(target, event);
194 break;
195 case ui::ET_MOUSE_MOVED:
196 HandleMouseMoved(target, event);
197 break;
198 case ui::ET_MOUSE_EXITED:
199 HandleMouseExited(target, event);
200 break;
201 default:
202 break;
206 void ToplevelWindowEventHandler::OnGestureEvent(ui::GestureEvent* event) {
207 if (event->handled())
208 return;
209 aura::Window* target = static_cast<aura::Window*>(event->target());
210 if (!target->delegate())
211 return;
213 if (window_resizer_.get() && !in_gesture_drag_)
214 return;
216 if (window_resizer_.get() &&
217 window_resizer_->resizer()->GetTarget() != target) {
218 return;
221 if (event->details().touch_points() > 2) {
222 if (CompleteDrag(DRAG_COMPLETE))
223 event->StopPropagation();
224 return;
227 switch (event->type()) {
228 case ui::ET_GESTURE_TAP_DOWN: {
229 int component = GetWindowComponent(target, *event);
230 if (!(WindowResizer::GetBoundsChangeForWindowComponent(component) &
231 WindowResizer::kBoundsChange_Resizes))
232 return;
233 ResizeShadowController* controller =
234 Shell::GetInstance()->resize_shadow_controller();
235 if (controller)
236 controller->ShowShadow(target, component);
237 return;
239 case ui::ET_GESTURE_END: {
240 ResizeShadowController* controller =
241 Shell::GetInstance()->resize_shadow_controller();
242 if (controller)
243 controller->HideShadow(target);
245 if (window_resizer_.get() &&
246 (event->details().touch_points() == 1 ||
247 !CanStartOneFingerDrag(first_finger_hittest_))) {
248 CompleteDrag(DRAG_COMPLETE);
249 event->StopPropagation();
251 return;
253 case ui::ET_GESTURE_BEGIN: {
254 if (event->details().touch_points() == 1) {
255 first_finger_hittest_ = GetWindowComponent(target, *event);
256 } else if (window_resizer_.get()) {
257 if (!window_resizer_->IsMove()) {
258 // The transition from resizing with one finger to resizing with two
259 // fingers causes unintended resizing because the location of
260 // ET_GESTURE_SCROLL_UPDATE jumps from the position of the first
261 // finger to the position in the middle of the two fingers. For this
262 // reason two finger resizing is not supported.
263 CompleteDrag(DRAG_COMPLETE);
264 event->StopPropagation();
266 } else {
267 int second_finger_hittest = GetWindowComponent(target, *event);
268 if (CanStartTwoFingerMove(
269 target, first_finger_hittest_, second_finger_hittest)) {
270 gfx::Point location_in_parent =
271 event->details().bounding_box().CenterPoint();
272 AttemptToStartDrag(target, location_in_parent, HTCAPTION,
273 aura::client::WINDOW_MOVE_SOURCE_TOUCH);
274 event->StopPropagation();
277 return;
279 case ui::ET_GESTURE_SCROLL_BEGIN: {
280 // The one finger drag is not started in ET_GESTURE_BEGIN to avoid the
281 // window jumping upon initiating a two finger drag. When a one finger
282 // drag is converted to a two finger drag, a jump occurs because the
283 // location of the ET_GESTURE_SCROLL_UPDATE event switches from the single
284 // finger's position to the position in the middle of the two fingers.
285 if (window_resizer_.get())
286 return;
287 int component = GetWindowComponent(target, *event);
288 if (!CanStartOneFingerDrag(component))
289 return;
290 gfx::Point location_in_parent(
291 ConvertPointToParent(target, event->location()));
292 AttemptToStartDrag(target, location_in_parent, component,
293 aura::client::WINDOW_MOVE_SOURCE_TOUCH);
294 event->StopPropagation();
295 return;
297 default:
298 break;
301 if (!window_resizer_.get())
302 return;
304 switch (event->type()) {
305 case ui::ET_GESTURE_SCROLL_UPDATE:
306 HandleDrag(target, event);
307 event->StopPropagation();
308 return;
309 case ui::ET_GESTURE_SCROLL_END:
310 // We must complete the drag here instead of as a result of ET_GESTURE_END
311 // because otherwise the drag will be reverted when EndMoveLoop() is
312 // called.
313 // TODO(pkotwicz): Pass drag completion status to
314 // WindowMoveClient::EndMoveLoop().
315 CompleteDrag(DRAG_COMPLETE);
316 event->StopPropagation();
317 return;
318 case ui::ET_SCROLL_FLING_START:
319 CompleteDrag(DRAG_COMPLETE);
321 // TODO(pkotwicz): Fix tests which inadvertantly start flings and check
322 // window_resizer_->IsMove() instead of the hittest component at |event|'s
323 // location.
324 if (GetWindowComponent(target, *event) != HTCAPTION ||
325 !wm::GetWindowState(target)->IsNormalOrSnapped()) {
326 return;
329 if (event->details().velocity_y() > kMinVertVelocityForWindowMinimize) {
330 SetWindowStateTypeFromGesture(target, wm::WINDOW_STATE_TYPE_MINIMIZED);
331 } else if (event->details().velocity_y() <
332 -kMinVertVelocityForWindowMinimize) {
333 SetWindowStateTypeFromGesture(target, wm::WINDOW_STATE_TYPE_MAXIMIZED);
334 } else if (event->details().velocity_x() >
335 kMinHorizVelocityForWindowSwipe) {
336 SetWindowStateTypeFromGesture(target,
337 wm::WINDOW_STATE_TYPE_RIGHT_SNAPPED);
338 } else if (event->details().velocity_x() <
339 -kMinHorizVelocityForWindowSwipe) {
340 SetWindowStateTypeFromGesture(target,
341 wm::WINDOW_STATE_TYPE_LEFT_SNAPPED);
343 event->StopPropagation();
344 return;
345 case ui::ET_GESTURE_SWIPE:
346 DCHECK_GT(event->details().touch_points(), 0);
347 if (event->details().touch_points() == 1)
348 return;
349 if (!wm::GetWindowState(target)->IsNormalOrSnapped())
350 return;
352 CompleteDrag(DRAG_COMPLETE);
354 if (event->details().swipe_down()) {
355 SetWindowStateTypeFromGesture(target, wm::WINDOW_STATE_TYPE_MINIMIZED);
356 } else if (event->details().swipe_up()) {
357 SetWindowStateTypeFromGesture(target, wm::WINDOW_STATE_TYPE_MAXIMIZED);
358 } else if (event->details().swipe_right()) {
359 SetWindowStateTypeFromGesture(target,
360 wm::WINDOW_STATE_TYPE_RIGHT_SNAPPED);
361 } else {
362 SetWindowStateTypeFromGesture(target,
363 wm::WINDOW_STATE_TYPE_LEFT_SNAPPED);
365 event->StopPropagation();
366 return;
367 default:
368 return;
372 aura::client::WindowMoveResult ToplevelWindowEventHandler::RunMoveLoop(
373 aura::Window* source,
374 const gfx::Vector2d& drag_offset,
375 aura::client::WindowMoveSource move_source) {
376 DCHECK(!in_move_loop_); // Can only handle one nested loop at a time.
377 aura::Window* root_window = source->GetRootWindow();
378 DCHECK(root_window);
379 // TODO(tdresser): Use gfx::PointF. See crbug.com/337824.
380 gfx::Point drag_location;
381 if (move_source == aura::client::WINDOW_MOVE_SOURCE_TOUCH &&
382 aura::Env::GetInstance()->is_touch_down()) {
383 gfx::PointF drag_location_f;
384 bool has_point = ui::GestureRecognizer::Get()->
385 GetLastTouchPointForTarget(source, &drag_location_f);
386 drag_location = gfx::ToFlooredPoint(drag_location_f);
387 DCHECK(has_point);
388 } else {
389 drag_location =
390 root_window->GetHost()->dispatcher()->GetLastMouseLocationInRoot();
391 aura::Window::ConvertPointToTarget(
392 root_window, source->parent(), &drag_location);
394 // Set the cursor before calling AttemptToStartDrag(), as that will
395 // eventually call LockCursor() and prevent the cursor from changing.
396 aura::client::CursorClient* cursor_client =
397 aura::client::GetCursorClient(root_window);
398 if (cursor_client)
399 cursor_client->SetCursor(ui::kCursorPointer);
400 if (!AttemptToStartDrag(source, drag_location, HTCAPTION, move_source))
401 return aura::client::MOVE_CANCELED;
403 in_move_loop_ = true;
404 bool destroyed = false;
405 destroyed_ = &destroyed;
406 base::MessageLoopForUI* loop = base::MessageLoopForUI::current();
407 base::MessageLoop::ScopedNestableTaskAllower allow_nested(loop);
408 base::RunLoop run_loop;
409 quit_closure_ = run_loop.QuitClosure();
410 run_loop.Run();
411 if (destroyed)
412 return aura::client::MOVE_CANCELED;
413 destroyed_ = NULL;
414 in_move_loop_ = false;
415 return drag_reverted_ ? aura::client::MOVE_CANCELED :
416 aura::client::MOVE_SUCCESSFUL;
419 void ToplevelWindowEventHandler::EndMoveLoop() {
420 if (in_move_loop_)
421 CompleteDrag(DRAG_REVERT);
424 void ToplevelWindowEventHandler::OnDisplayConfigurationChanging() {
425 CompleteDrag(DRAG_REVERT);
428 bool ToplevelWindowEventHandler::AttemptToStartDrag(
429 aura::Window* window,
430 const gfx::Point& point_in_parent,
431 int window_component,
432 aura::client::WindowMoveSource source) {
433 if (window_resizer_.get())
434 return false;
435 WindowResizer* resizer = CreateWindowResizer(window, point_in_parent,
436 window_component, source).release();
437 if (!resizer)
438 return false;
440 window_resizer_.reset(new ScopedWindowResizer(this, resizer));
442 pre_drag_window_bounds_ = window->bounds();
443 in_gesture_drag_ = (source == aura::client::WINDOW_MOVE_SOURCE_TOUCH);
444 return true;
447 bool ToplevelWindowEventHandler::CompleteDrag(DragCompletionStatus status) {
448 if (!window_resizer_)
449 return false;
451 scoped_ptr<ScopedWindowResizer> resizer(window_resizer_.release());
452 switch (status) {
453 case DRAG_COMPLETE:
454 resizer->resizer()->CompleteDrag();
455 break;
456 case DRAG_REVERT:
457 resizer->resizer()->RevertDrag();
458 break;
459 case DRAG_RESIZER_WINDOW_DESTROYED:
460 // We explicitly do not invoke RevertDrag() since that may do things to
461 // WindowResizer::GetTarget() which was destroyed.
462 break;
464 drag_reverted_ = (status != DRAG_COMPLETE);
466 first_finger_hittest_ = HTNOWHERE;
467 in_gesture_drag_ = false;
468 if (in_move_loop_)
469 quit_closure_.Run();
470 return true;
473 void ToplevelWindowEventHandler::HandleMousePressed(
474 aura::Window* target,
475 ui::MouseEvent* event) {
476 if (event->phase() != ui::EP_PRETARGET || !target->delegate())
477 return;
479 // We also update the current window component here because for the
480 // mouse-drag-release-press case, where the mouse is released and
481 // pressed without mouse move event.
482 int component = GetWindowComponent(target, *event);
483 if ((event->flags() &
484 (ui::EF_IS_DOUBLE_CLICK | ui::EF_IS_TRIPLE_CLICK)) == 0 &&
485 WindowResizer::GetBoundsChangeForWindowComponent(component)) {
486 gfx::Point location_in_parent(
487 ConvertPointToParent(target, event->location()));
488 AttemptToStartDrag(target, location_in_parent, component,
489 aura::client::WINDOW_MOVE_SOURCE_MOUSE);
490 // Set as handled so that other event handlers do no act upon the event
491 // but still receive it so that they receive both parts of each pressed/
492 // released pair.
493 event->SetHandled();
494 } else {
495 CompleteDrag(DRAG_COMPLETE);
499 void ToplevelWindowEventHandler::HandleMouseReleased(
500 aura::Window* target,
501 ui::MouseEvent* event) {
502 if (event->phase() != ui::EP_PRETARGET)
503 return;
505 CompleteDrag(event->type() == ui::ET_MOUSE_RELEASED ?
506 DRAG_COMPLETE : DRAG_REVERT);
509 void ToplevelWindowEventHandler::HandleDrag(
510 aura::Window* target,
511 ui::LocatedEvent* event) {
512 // This function only be triggered to move window
513 // by mouse drag or touch move event.
514 DCHECK(event->type() == ui::ET_MOUSE_DRAGGED ||
515 event->type() == ui::ET_TOUCH_MOVED ||
516 event->type() == ui::ET_GESTURE_SCROLL_UPDATE);
518 // Drag actions are performed pre-target handling to prevent spurious mouse
519 // moves from the move/size operation from being sent to the target.
520 if (event->phase() != ui::EP_PRETARGET)
521 return;
523 if (!window_resizer_)
524 return;
525 window_resizer_->resizer()->Drag(
526 ConvertPointToParent(target, event->location()), event->flags());
527 event->StopPropagation();
530 void ToplevelWindowEventHandler::HandleMouseMoved(
531 aura::Window* target,
532 ui::LocatedEvent* event) {
533 // Shadow effects are applied after target handling. Note that we don't
534 // respect ER_HANDLED here right now since we have not had a reason to allow
535 // the target to cancel shadow rendering.
536 if (event->phase() != ui::EP_POSTTARGET || !target->delegate())
537 return;
539 // TODO(jamescook): Move the resize cursor update code into here from
540 // CompoundEventFilter?
541 ResizeShadowController* controller =
542 Shell::GetInstance()->resize_shadow_controller();
543 if (controller) {
544 if (event->flags() & ui::EF_IS_NON_CLIENT) {
545 int component =
546 target->delegate()->GetNonClientComponent(event->location());
547 controller->ShowShadow(target, component);
548 } else {
549 controller->HideShadow(target);
554 void ToplevelWindowEventHandler::HandleMouseExited(
555 aura::Window* target,
556 ui::LocatedEvent* event) {
557 // Shadow effects are applied after target handling. Note that we don't
558 // respect ER_HANDLED here right now since we have not had a reason to allow
559 // the target to cancel shadow rendering.
560 if (event->phase() != ui::EP_POSTTARGET)
561 return;
563 ResizeShadowController* controller =
564 Shell::GetInstance()->resize_shadow_controller();
565 if (controller)
566 controller->HideShadow(target);
569 void ToplevelWindowEventHandler::SetWindowStateTypeFromGesture(
570 aura::Window* window,
571 wm::WindowStateType new_state_type) {
572 wm::WindowState* window_state = ash::wm::GetWindowState(window);
573 // TODO(oshima): Move extra logic (set_unminimize_to_restore_bounds,
574 // SetRestoreBoundsInParent) that modifies the window state
575 // into WindowState.
576 switch (new_state_type) {
577 case wm::WINDOW_STATE_TYPE_MINIMIZED:
578 if (window_state->CanMinimize()) {
579 window_state->Minimize();
580 window_state->set_unminimize_to_restore_bounds(true);
581 window_state->SetRestoreBoundsInParent(pre_drag_window_bounds_);
583 break;
584 case wm::WINDOW_STATE_TYPE_MAXIMIZED:
585 if (window_state->CanMaximize()) {
586 window_state->SetRestoreBoundsInParent(pre_drag_window_bounds_);
587 window_state->Maximize();
589 break;
590 case wm::WINDOW_STATE_TYPE_LEFT_SNAPPED:
591 if (window_state->CanSnap()) {
592 window_state->SetRestoreBoundsInParent(pre_drag_window_bounds_);
593 const wm::WMEvent event(wm::WM_EVENT_SNAP_LEFT);
594 window_state->OnWMEvent(&event);
596 break;
597 case wm::WINDOW_STATE_TYPE_RIGHT_SNAPPED:
598 if (window_state->CanSnap()) {
599 window_state->SetRestoreBoundsInParent(pre_drag_window_bounds_);
600 const wm::WMEvent event(wm::WM_EVENT_SNAP_RIGHT);
601 window_state->OnWMEvent(&event);
603 break;
604 default:
605 NOTREACHED();
609 void ToplevelWindowEventHandler::ResizerWindowDestroyed() {
610 CompleteDrag(DRAG_RESIZER_WINDOW_DESTROYED);
613 } // namespace ash