| // Copyright 2015 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 "components/mus/ws/event_dispatcher.h" |
| |
| #include <algorithm> |
| |
| #include "base/time/time.h" |
| #include "components/mus/ws/accelerator.h" |
| #include "components/mus/ws/display.h" |
| #include "components/mus/ws/event_dispatcher_delegate.h" |
| #include "components/mus/ws/server_window.h" |
| #include "components/mus/ws/server_window_delegate.h" |
| #include "components/mus/ws/window_coordinate_conversions.h" |
| #include "components/mus/ws/window_finder.h" |
| #include "mojo/converters/geometry/geometry_type_converters.h" |
| #include "mojo/converters/input_events/input_events_type_converters.h" |
| #include "ui/events/event_utils.h" |
| #include "ui/gfx/geometry/point.h" |
| #include "ui/gfx/geometry/point_conversions.h" |
| |
| namespace mus { |
| namespace ws { |
| namespace { |
| |
| bool IsOnlyOneMouseButtonDown(int flags) { |
| const uint32_t button_only_flags = |
| flags & (ui::EF_LEFT_MOUSE_BUTTON | ui::EF_MIDDLE_MOUSE_BUTTON | |
| ui::EF_RIGHT_MOUSE_BUTTON); |
| return button_only_flags == ui::EF_LEFT_MOUSE_BUTTON || |
| button_only_flags == ui::EF_MIDDLE_MOUSE_BUTTON || |
| button_only_flags == ui::EF_RIGHT_MOUSE_BUTTON; |
| } |
| |
| bool IsLocationInNonclientArea(const ServerWindow* target, |
| const gfx::Point& location) { |
| if (!target->parent()) |
| return false; |
| |
| gfx::Rect client_area(target->bounds().size()); |
| client_area.Inset(target->client_area()); |
| if (client_area.Contains(location)) |
| return false; |
| |
| for (const auto& rect : target->additional_client_areas()) { |
| if (rect.Contains(location)) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| uint32_t PointerId(const ui::LocatedEvent& event) { |
| if (event.IsPointerEvent()) |
| return event.AsPointerEvent()->pointer_id(); |
| if (event.IsMouseWheelEvent()) |
| return ui::PointerEvent::kMousePointerId; |
| |
| NOTREACHED(); |
| return 0; |
| } |
| |
| } // namespace |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| EventDispatcher::EventDispatcher(EventDispatcherDelegate* delegate) |
| : delegate_(delegate), |
| root_(nullptr), |
| capture_window_(nullptr), |
| capture_window_in_nonclient_area_(false), |
| modal_window_controller_(this), |
| mouse_button_down_(false), |
| mouse_cursor_source_window_(nullptr), |
| mouse_cursor_in_non_client_area_(false) {} |
| |
| EventDispatcher::~EventDispatcher() { |
| if (capture_window_) { |
| UnobserveWindow(capture_window_); |
| capture_window_ = nullptr; |
| } |
| for (const auto& pair : pointer_targets_) { |
| if (pair.second.window) |
| UnobserveWindow(pair.second.window); |
| } |
| pointer_targets_.clear(); |
| } |
| |
| void EventDispatcher::Reset() { |
| if (capture_window_) { |
| CancelPointerEventsToTarget(capture_window_); |
| DCHECK(capture_window_ == nullptr); |
| } |
| |
| while (!pointer_targets_.empty()) |
| StopTrackingPointer(pointer_targets_.begin()->first); |
| |
| mouse_button_down_ = false; |
| } |
| |
| void EventDispatcher::SetMousePointerScreenLocation( |
| const gfx::Point& screen_location) { |
| DCHECK(pointer_targets_.empty()); |
| mouse_pointer_last_location_ = screen_location; |
| UpdateCursorProviderByLastKnownLocation(); |
| // Write our initial location back to our shared screen coordinate. This |
| // shouldn't cause problems because we already read the cursor before we |
| // process any events in views during window construction. |
| delegate_->OnMouseCursorLocationChanged(screen_location); |
| } |
| |
| bool EventDispatcher::GetCurrentMouseCursor(int32_t* cursor_out) { |
| if (!mouse_cursor_source_window_) |
| return false; |
| |
| *cursor_out = mouse_cursor_in_non_client_area_ |
| ? mouse_cursor_source_window_->non_client_cursor() |
| : mouse_cursor_source_window_->cursor(); |
| return true; |
| } |
| |
| bool EventDispatcher::SetCaptureWindow(ServerWindow* window, |
| bool in_nonclient_area) { |
| if (window == capture_window_) |
| return true; |
| |
| // A window that is blocked by a modal window cannot gain capture. |
| if (window && modal_window_controller_.IsWindowBlocked(window)) |
| return false; |
| |
| if (capture_window_) { |
| // Stop observing old capture window. |pointer_targets_| are cleared on |
| // initial setting of a capture window. |
| delegate_->OnServerWindowCaptureLost(capture_window_); |
| UnobserveWindow(capture_window_); |
| } else { |
| // Cancel implicit capture to all other windows. |
| for (const auto& pair : pointer_targets_) { |
| ServerWindow* target = pair.second.window; |
| if (!target) |
| continue; |
| UnobserveWindow(target); |
| if (target == window) |
| continue; |
| |
| ui::EventType event_type = pair.second.is_mouse_event |
| ? ui::ET_POINTER_EXITED |
| : ui::ET_POINTER_CANCELLED; |
| ui::EventPointerType pointer_type = |
| pair.second.is_mouse_event ? ui::EventPointerType::POINTER_TYPE_MOUSE |
| : ui::EventPointerType::POINTER_TYPE_TOUCH; |
| // TODO(jonross): Track previous location in PointerTarget for sending |
| // cancels. |
| ui::PointerEvent event(event_type, pointer_type, gfx::Point(), |
| gfx::Point(), ui::EF_NONE, pair.first, |
| ui::EventTimeForNow()); |
| DispatchToPointerTarget(pair.second, event); |
| } |
| pointer_targets_.clear(); |
| } |
| |
| // Set the capture before changing native capture; otherwise, the callback |
| // from native platform might try to set the capture again. |
| bool had_capture_window = capture_window_ != nullptr; |
| capture_window_ = window; |
| capture_window_in_nonclient_area_ = in_nonclient_area; |
| |
| // Begin tracking the capture window if it is not yet being observed. |
| if (window) { |
| ObserveWindow(window); |
| if (!had_capture_window) |
| delegate_->SetNativeCapture(); |
| } else { |
| delegate_->ReleaseNativeCapture(); |
| if (!mouse_button_down_) |
| UpdateCursorProviderByLastKnownLocation(); |
| } |
| |
| return true; |
| } |
| |
| void EventDispatcher::AddSystemModalWindow(ServerWindow* window) { |
| modal_window_controller_.AddSystemModalWindow(window); |
| } |
| |
| void EventDispatcher::ReleaseCaptureBlockedByModalWindow( |
| const ServerWindow* modal_window) { |
| if (!capture_window_) |
| return; |
| |
| if (modal_window_controller_.IsWindowBlockedBy(capture_window_, |
| modal_window)) { |
| SetCaptureWindow(nullptr, false); |
| } |
| } |
| |
| void EventDispatcher::ReleaseCaptureBlockedByAnyModalWindow() { |
| if (!capture_window_) |
| return; |
| |
| if (modal_window_controller_.IsWindowBlocked(capture_window_)) |
| SetCaptureWindow(nullptr, false); |
| } |
| |
| void EventDispatcher::UpdateNonClientAreaForCurrentWindow() { |
| if (mouse_cursor_source_window_) { |
| gfx::Point location = mouse_pointer_last_location_; |
| ServerWindow* target = FindDeepestVisibleWindowForEvents(root_, &location); |
| if (target == mouse_cursor_source_window_) { |
| mouse_cursor_in_non_client_area_ = |
| mouse_cursor_source_window_ |
| ? IsLocationInNonclientArea(mouse_cursor_source_window_, location) |
| : false; |
| } |
| } |
| } |
| |
| void EventDispatcher::UpdateCursorProviderByLastKnownLocation() { |
| if (!mouse_button_down_) { |
| gfx::Point location = mouse_pointer_last_location_; |
| mouse_cursor_source_window_ = |
| FindDeepestVisibleWindowForEvents(root_, &location); |
| |
| mouse_cursor_in_non_client_area_ = |
| mouse_cursor_source_window_ |
| ? IsLocationInNonclientArea(mouse_cursor_source_window_, location) |
| : false; |
| } |
| } |
| |
| bool EventDispatcher::AddAccelerator(uint32_t id, |
| mojom::EventMatcherPtr event_matcher) { |
| std::unique_ptr<Accelerator> accelerator(new Accelerator(id, *event_matcher)); |
| // If an accelerator with the same id or matcher already exists, then abort. |
| for (const auto& pair : accelerators_) { |
| if (pair.first == id || accelerator->EqualEventMatcher(pair.second.get())) |
| return false; |
| } |
| accelerators_.insert(Entry(id, std::move(accelerator))); |
| return true; |
| } |
| |
| void EventDispatcher::RemoveAccelerator(uint32_t id) { |
| auto it = accelerators_.find(id); |
| // Clients may pass bogus ids. |
| if (it != accelerators_.end()) |
| accelerators_.erase(it); |
| } |
| |
| void EventDispatcher::ProcessEvent(const ui::Event& event) { |
| if (!root_) // Tests may not have a root window. |
| return; |
| |
| if (event.IsKeyEvent()) { |
| const ui::KeyEvent* key_event = event.AsKeyEvent(); |
| if (event.type() == ui::ET_KEY_PRESSED && !key_event->is_char()) { |
| Accelerator* pre_target = |
| FindAccelerator(*key_event, mojom::AcceleratorPhase::PRE_TARGET); |
| if (pre_target) { |
| delegate_->OnAccelerator(pre_target->id(), event); |
| return; |
| } |
| } |
| ProcessKeyEvent(*key_event); |
| return; |
| } |
| |
| if (event.IsPointerEvent() || event.IsMouseWheelEvent()) { |
| ProcessLocatedEvent(*event.AsLocatedEvent()); |
| return; |
| } |
| |
| NOTREACHED(); |
| } |
| |
| void EventDispatcher::ProcessKeyEvent(const ui::KeyEvent& event) { |
| Accelerator* post_target = |
| FindAccelerator(event, mojom::AcceleratorPhase::POST_TARGET); |
| ServerWindow* focused_window = |
| delegate_->GetFocusedWindowForEventDispatcher(); |
| if (focused_window) { |
| delegate_->DispatchInputEventToWindow(focused_window, false, event, |
| post_target); |
| return; |
| } |
| delegate_->OnEventTargetNotFound(event); |
| if (post_target) |
| delegate_->OnAccelerator(post_target->id(), event); |
| } |
| |
| void EventDispatcher::ProcessLocatedEvent(const ui::LocatedEvent& event) { |
| DCHECK(event.IsPointerEvent() || event.IsMouseWheelEvent()); |
| const bool is_mouse_event = |
| event.IsMousePointerEvent() || event.IsMouseWheelEvent(); |
| |
| if (is_mouse_event) { |
| mouse_pointer_last_location_ = event.location(); |
| delegate_->OnMouseCursorLocationChanged(event.root_location()); |
| } |
| |
| // Release capture on pointer up. For mouse we only release if there are |
| // no buttons down. |
| const bool is_pointer_going_up = |
| (event.type() == ui::ET_POINTER_UP || |
| event.type() == ui::ET_POINTER_CANCELLED) && |
| (!is_mouse_event || IsOnlyOneMouseButtonDown(event.flags())); |
| |
| // Update mouse down state upon events which change it. |
| if (is_mouse_event) { |
| if (event.type() == ui::ET_POINTER_DOWN) |
| mouse_button_down_ = true; |
| else if (is_pointer_going_up) |
| mouse_button_down_ = false; |
| } |
| |
| if (capture_window_) { |
| mouse_cursor_source_window_ = capture_window_; |
| PointerTarget pointer_target; |
| pointer_target.window = capture_window_; |
| pointer_target.in_nonclient_area = capture_window_in_nonclient_area_; |
| DispatchToPointerTarget(pointer_target, event); |
| return; |
| } |
| |
| const int32_t pointer_id = PointerId(event); |
| if (!IsTrackingPointer(pointer_id) || |
| !pointer_targets_[pointer_id].is_pointer_down) { |
| const bool any_pointers_down = AreAnyPointersDown(); |
| UpdateTargetForPointer(pointer_id, event); |
| if (is_mouse_event) |
| mouse_cursor_source_window_ = pointer_targets_[pointer_id].window; |
| |
| PointerTarget& pointer_target = pointer_targets_[pointer_id]; |
| if (pointer_target.is_pointer_down) { |
| if (is_mouse_event) |
| mouse_cursor_source_window_ = pointer_target.window; |
| if (!any_pointers_down) { |
| delegate_->SetFocusedWindowFromEventDispatcher(pointer_target.window); |
| delegate_->SetNativeCapture(); |
| } |
| } |
| } |
| |
| // When we release the mouse button, we want the cursor to be sourced from |
| // the window under the mouse pointer, even though we're sending the button |
| // up event to the window that had implicit capture. We have to set this |
| // before we perform dispatch because the Delegate is going to read this |
| // information from us. |
| if (is_pointer_going_up && is_mouse_event) |
| UpdateCursorProviderByLastKnownLocation(); |
| |
| DispatchToPointerTarget(pointer_targets_[pointer_id], event); |
| |
| if (is_pointer_going_up) { |
| if (is_mouse_event) |
| pointer_targets_[pointer_id].is_pointer_down = false; |
| else |
| StopTrackingPointer(pointer_id); |
| if (!AreAnyPointersDown()) |
| delegate_->ReleaseNativeCapture(); |
| } |
| } |
| |
| void EventDispatcher::StartTrackingPointer( |
| int32_t pointer_id, |
| const PointerTarget& pointer_target) { |
| DCHECK(!IsTrackingPointer(pointer_id)); |
| ObserveWindow(pointer_target.window); |
| pointer_targets_[pointer_id] = pointer_target; |
| } |
| |
| void EventDispatcher::StopTrackingPointer(int32_t pointer_id) { |
| DCHECK(IsTrackingPointer(pointer_id)); |
| ServerWindow* window = pointer_targets_[pointer_id].window; |
| pointer_targets_.erase(pointer_id); |
| if (window) |
| UnobserveWindow(window); |
| } |
| |
| void EventDispatcher::UpdateTargetForPointer(int32_t pointer_id, |
| const ui::LocatedEvent& event) { |
| if (!IsTrackingPointer(pointer_id)) { |
| StartTrackingPointer(pointer_id, PointerTargetForEvent(event)); |
| return; |
| } |
| |
| const PointerTarget pointer_target = PointerTargetForEvent(event); |
| if (pointer_target.window == pointer_targets_[pointer_id].window && |
| pointer_target.in_nonclient_area == |
| pointer_targets_[pointer_id].in_nonclient_area) { |
| // The targets are the same, only set the down state to true if necessary. |
| // Down going to up is handled by ProcessLocatedEvent(). |
| if (pointer_target.is_pointer_down) |
| pointer_targets_[pointer_id].is_pointer_down = true; |
| return; |
| } |
| |
| // The targets are changing. Send an exit if appropriate. |
| if (event.IsMousePointerEvent()) { |
| ui::PointerEvent exit_event( |
| ui::ET_POINTER_EXITED, ui::EventPointerType::POINTER_TYPE_MOUSE, |
| event.location(), event.root_location(), event.flags(), |
| ui::PointerEvent::kMousePointerId, event.time_stamp()); |
| DispatchToPointerTarget(pointer_targets_[pointer_id], exit_event); |
| } |
| |
| // Technically we're updating in place, but calling start then stop makes for |
| // simpler code. |
| StopTrackingPointer(pointer_id); |
| StartTrackingPointer(pointer_id, pointer_target); |
| } |
| |
| EventDispatcher::PointerTarget EventDispatcher::PointerTargetForEvent( |
| const ui::LocatedEvent& event) const { |
| PointerTarget pointer_target; |
| gfx::Point location(event.location()); |
| ServerWindow* target_window = |
| FindDeepestVisibleWindowForEvents(root_, &location); |
| pointer_target.window = |
| modal_window_controller_.GetTargetForWindow(target_window); |
| pointer_target.is_mouse_event = event.IsMousePointerEvent(); |
| pointer_target.in_nonclient_area = |
| target_window != pointer_target.window || |
| IsLocationInNonclientArea(pointer_target.window, location); |
| pointer_target.is_pointer_down = event.type() == ui::ET_POINTER_DOWN; |
| return pointer_target; |
| } |
| |
| bool EventDispatcher::AreAnyPointersDown() const { |
| for (const auto& pair : pointer_targets_) { |
| if (pair.second.is_pointer_down) |
| return true; |
| } |
| return false; |
| } |
| |
| void EventDispatcher::DispatchToPointerTarget(const PointerTarget& target, |
| const ui::LocatedEvent& event) { |
| if (!target.window) { |
| delegate_->OnEventTargetNotFound(event); |
| return; |
| } |
| |
| if (target.is_mouse_event) |
| mouse_cursor_in_non_client_area_ = target.in_nonclient_area; |
| |
| gfx::Point location(event.location()); |
| gfx::Transform transform(GetTransformToWindow(target.window)); |
| transform.TransformPoint(&location); |
| std::unique_ptr<ui::Event> clone = ui::Event::Clone(event); |
| clone->AsLocatedEvent()->set_location(location); |
| // TODO(jonross): add post-target accelerator support once accelerators |
| // support pointer events. |
| delegate_->DispatchInputEventToWindow(target.window, target.in_nonclient_area, |
| *clone, nullptr); |
| } |
| |
| void EventDispatcher::CancelPointerEventsToTarget(ServerWindow* window) { |
| if (capture_window_ == window) { |
| UnobserveWindow(window); |
| capture_window_ = nullptr; |
| mouse_button_down_ = false; |
| // A window only cares to be informed that it lost capture if it explicitly |
| // requested capture. A window can lose capture if another window gains |
| // explicit capture. |
| delegate_->OnServerWindowCaptureLost(window); |
| delegate_->ReleaseNativeCapture(); |
| UpdateCursorProviderByLastKnownLocation(); |
| return; |
| } |
| |
| for (auto& pair : pointer_targets_) { |
| if (pair.second.window == window) { |
| UnobserveWindow(window); |
| pair.second.window = nullptr; |
| } |
| } |
| } |
| |
| void EventDispatcher::ObserveWindow(ServerWindow* window) { |
| auto res = observed_windows_.insert(std::make_pair(window, 0u)); |
| res.first->second++; |
| if (res.second) |
| window->AddObserver(this); |
| } |
| |
| void EventDispatcher::UnobserveWindow(ServerWindow* window) { |
| auto it = observed_windows_.find(window); |
| DCHECK(it != observed_windows_.end()); |
| DCHECK_LT(0u, it->second); |
| it->second--; |
| if (!it->second) { |
| window->RemoveObserver(this); |
| observed_windows_.erase(it); |
| } |
| } |
| |
| Accelerator* EventDispatcher::FindAccelerator( |
| const ui::KeyEvent& event, |
| const mojom::AcceleratorPhase phase) { |
| for (const auto& pair : accelerators_) { |
| if (pair.second->MatchesEvent(event, phase)) { |
| return pair.second.get(); |
| } |
| } |
| return nullptr; |
| } |
| |
| void EventDispatcher::OnWillChangeWindowHierarchy(ServerWindow* window, |
| ServerWindow* new_parent, |
| ServerWindow* old_parent) { |
| CancelPointerEventsToTarget(window); |
| } |
| |
| void EventDispatcher::OnWindowVisibilityChanged(ServerWindow* window) { |
| CancelPointerEventsToTarget(window); |
| } |
| |
| void EventDispatcher::OnWindowDestroyed(ServerWindow* window) { |
| CancelPointerEventsToTarget(window); |
| |
| if (mouse_cursor_source_window_ == window) |
| mouse_cursor_source_window_ = nullptr; |
| } |
| |
| } // namespace ws |
| } // namespace mus |