| // Copyright (c) 2012 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 "ui/base/x/x11_whole_screen_move_loop.h" |
| |
| #include <stddef.h> |
| |
| #include <memory> |
| #include <utility> |
| |
| #include "base/bind.h" |
| #include "base/logging.h" |
| #include "base/run_loop.h" |
| #include "base/single_thread_task_runner.h" |
| #include "base/stl_util.h" |
| #include "base/task/current_thread.h" |
| #include "base/threading/thread_task_runner_handle.h" |
| #include "ui/base/x/x11_pointer_grab.h" |
| #include "ui/base/x/x11_util.h" |
| #include "ui/events/event.h" |
| #include "ui/events/event_utils.h" |
| #include "ui/events/keycodes/keyboard_code_conversion_x.h" |
| #include "ui/events/platform/platform_event_source.h" |
| #include "ui/events/platform/scoped_event_dispatcher.h" |
| #include "ui/events/platform/x11/x11_event_source.h" |
| #include "ui/events/x/events_x_utils.h" |
| #include "ui/events/x/x11_window_event_manager.h" |
| #include "ui/gfx/x/connection.h" |
| #include "ui/gfx/x/x11.h" |
| #include "ui/gfx/x/xproto.h" |
| |
| namespace ui { |
| |
| namespace { |
| |
| constexpr x11::KeySym kEscKeysym = static_cast<x11::KeySym>(0xff1b); |
| |
| // XGrabKey requires the modifier mask to explicitly be specified. |
| constexpr x11::ModMask kModifiersMasks[] = { |
| {}, // No additional modifier. |
| x11::ModMask::c_2, // Num lock |
| x11::ModMask::Lock, // Caps lock |
| x11::ModMask::c_5, // Scroll lock |
| x11::ModMask::c_2 | x11::ModMask::Lock, |
| x11::ModMask::c_2 | x11::ModMask::c_5, |
| x11::ModMask::Lock | x11::ModMask::c_5, |
| x11::ModMask::c_2 | x11::ModMask::Lock | x11::ModMask::c_5, |
| }; |
| |
| } // namespace |
| |
| X11WholeScreenMoveLoop::X11WholeScreenMoveLoop(X11MoveLoopDelegate* delegate) |
| : delegate_(delegate), |
| in_move_loop_(false), |
| grab_input_window_(x11::Window::None), |
| grabbed_pointer_(false), |
| canceled_(false) {} |
| |
| X11WholeScreenMoveLoop::~X11WholeScreenMoveLoop() { |
| EndMoveLoop(); |
| } |
| |
| void X11WholeScreenMoveLoop::DispatchMouseMovement() { |
| if (!last_motion_in_screen_) |
| return; |
| delegate_->OnMouseMovement(last_motion_in_screen_->root_location(), |
| last_motion_in_screen_->flags(), |
| last_motion_in_screen_->time_stamp()); |
| last_motion_in_screen_.reset(); |
| } |
| |
| void X11WholeScreenMoveLoop::PostDispatchIfNeeded(const ui::MouseEvent& event) { |
| bool dispatch_mouse_event = !last_motion_in_screen_; |
| last_motion_in_screen_ = std::make_unique<ui::MouseEvent>(event); |
| if (dispatch_mouse_event) { |
| // Post a task to dispatch mouse movement event when control returns to the |
| // message loop. This allows smoother dragging since the events are |
| // dispatched without waiting for the drag widget updates. |
| base::ThreadTaskRunnerHandle::Get()->PostTask( |
| FROM_HERE, |
| base::BindOnce(&X11WholeScreenMoveLoop::DispatchMouseMovement, |
| weak_factory_.GetWeakPtr())); |
| } |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // DesktopWindowTreeHostLinux, ui::PlatformEventDispatcher implementation: |
| |
| bool X11WholeScreenMoveLoop::CanDispatchEvent(const ui::PlatformEvent& event) { |
| return in_move_loop_; |
| } |
| |
| uint32_t X11WholeScreenMoveLoop::DispatchEvent(const ui::PlatformEvent& event) { |
| DCHECK(base::CurrentUIThread::IsSet()); |
| |
| // This method processes all events while the move loop is active. |
| if (!in_move_loop_) |
| return ui::POST_DISPATCH_PERFORM_DEFAULT; |
| |
| switch (event->type()) { |
| case ui::ET_MOUSE_MOVED: |
| case ui::ET_MOUSE_DRAGGED: { |
| PostDispatchIfNeeded(*event->AsMouseEvent()); |
| return ui::POST_DISPATCH_NONE; |
| } |
| case ui::ET_MOUSE_RELEASED: { |
| if (event->AsMouseEvent()->IsLeftMouseButton()) { |
| // Assume that drags are being done with the left mouse button. Only |
| // break the drag if the left mouse button was released. |
| DispatchMouseMovement(); |
| delegate_->OnMouseReleased(); |
| |
| if (!grabbed_pointer_) { |
| // If the source widget had capture prior to the move loop starting, |
| // it may be relying on views::Widget getting the mouse release and |
| // releasing capture in Widget::OnMouseEvent(). |
| return ui::POST_DISPATCH_PERFORM_DEFAULT; |
| } |
| } |
| return ui::POST_DISPATCH_NONE; |
| } |
| case ui::ET_KEY_PRESSED: |
| if (event->AsKeyEvent()->key_code() == ui::VKEY_ESCAPE) { |
| canceled_ = true; |
| EndMoveLoop(); |
| return ui::POST_DISPATCH_NONE; |
| } |
| break; |
| default: |
| break; |
| } |
| return ui::POST_DISPATCH_PERFORM_DEFAULT; |
| } |
| |
| bool X11WholeScreenMoveLoop::RunMoveLoop( |
| bool can_grab_pointer, |
| scoped_refptr<ui::X11Cursor> old_cursor, |
| scoped_refptr<ui::X11Cursor> new_cursor) { |
| DCHECK(!in_move_loop_); // Can only handle one nested loop at a time. |
| |
| // Query the mouse cursor prior to the move loop starting so that it can be |
| // restored when the move loop finishes. |
| initial_cursor_ = old_cursor; |
| |
| CreateDragInputWindow(x11::Connection::Get()); |
| |
| // Only grab mouse capture of |grab_input_window_| if |can_grab_pointer| is |
| // true aka the source that initiated the move loop doesn't have explicit |
| // grab. |
| // - The caller may intend to transfer capture to a different X11Window |
| // when the move loop ends and not release capture. |
| // - Releasing capture and X window destruction are both asynchronous. We drop |
| // events targeted at |grab_input_window_| in the time between the move |
| // loop ends and |grab_input_window_| loses capture. |
| grabbed_pointer_ = false; |
| if (can_grab_pointer) { |
| grabbed_pointer_ = GrabPointer(new_cursor); |
| if (!grabbed_pointer_) { |
| x11::Connection::Get()->DestroyWindow({grab_input_window_}); |
| return false; |
| } |
| } |
| |
| GrabEscKey(); |
| |
| std::unique_ptr<ui::ScopedEventDispatcher> old_dispatcher = |
| std::move(nested_dispatcher_); |
| nested_dispatcher_ = |
| ui::PlatformEventSource::GetInstance()->OverrideDispatcher(this); |
| |
| base::WeakPtr<X11WholeScreenMoveLoop> alive(weak_factory_.GetWeakPtr()); |
| |
| in_move_loop_ = true; |
| canceled_ = false; |
| base::RunLoop run_loop(base::RunLoop::Type::kNestableTasksAllowed); |
| quit_closure_ = run_loop.QuitClosure(); |
| run_loop.Run(); |
| |
| if (!alive) |
| return false; |
| |
| nested_dispatcher_ = std::move(old_dispatcher); |
| return !canceled_; |
| } |
| |
| void X11WholeScreenMoveLoop::UpdateCursor(scoped_refptr<ui::X11Cursor> cursor) { |
| if (in_move_loop_) |
| ui::ChangeActivePointerGrabCursor(cursor); |
| } |
| |
| void X11WholeScreenMoveLoop::EndMoveLoop() { |
| if (!in_move_loop_) |
| return; |
| |
| // Prevent DispatchMouseMovement from dispatching any posted motion event. |
| last_motion_in_screen_.reset(); |
| |
| // TODO(erg): Is this ungrab the cause of having to click to give input focus |
| // on drawn out windows? Not ungrabbing here screws the X server until I kill |
| // the chrome process. |
| |
| // Ungrab before we let go of the window. |
| if (grabbed_pointer_) |
| ui::UngrabPointer(); |
| else |
| UpdateCursor(initial_cursor_); |
| |
| auto* connection = x11::Connection::Get(); |
| auto esc_keycode = connection->KeysymToKeycode(kEscKeysym); |
| for (auto mask : kModifiersMasks) |
| connection->UngrabKey({esc_keycode, grab_input_window_, mask}); |
| |
| // Restore the previous dispatcher. |
| nested_dispatcher_.reset(); |
| delegate_->OnMoveLoopEnded(); |
| grab_input_window_events_.reset(); |
| connection->DestroyWindow({grab_input_window_}); |
| grab_input_window_ = x11::Window::None; |
| |
| in_move_loop_ = false; |
| std::move(quit_closure_).Run(); |
| } |
| |
| bool X11WholeScreenMoveLoop::GrabPointer(scoped_refptr<X11Cursor> cursor) { |
| auto* connection = x11::Connection::Get(); |
| |
| // Pass "owner_events" as false so that X sends all mouse events to |
| // |grab_input_window_|. |
| auto ret = ui::GrabPointer(grab_input_window_, false, cursor); |
| if (ret != x11::GrabStatus::Success) { |
| DLOG(ERROR) << "Grabbing pointer for dragging failed: " |
| << ui::GetX11ErrorString(connection->display(), |
| static_cast<int>(ret)); |
| } |
| connection->Flush(); |
| return ret == x11::GrabStatus::Success; |
| } |
| |
| void X11WholeScreenMoveLoop::GrabEscKey() { |
| auto* connection = x11::Connection::Get(); |
| auto esc_keycode = connection->KeysymToKeycode(kEscKeysym); |
| for (auto mask : kModifiersMasks) { |
| connection->GrabKey({false, grab_input_window_, mask, esc_keycode, |
| x11::GrabMode::Async, x11::GrabMode::Async}); |
| } |
| } |
| |
| void X11WholeScreenMoveLoop::CreateDragInputWindow( |
| x11::Connection* connection) { |
| grab_input_window_ = connection->GenerateId<x11::Window>(); |
| connection->CreateWindow({ |
| .wid = grab_input_window_, |
| .parent = connection->default_root(), |
| .x = -100, |
| .y = -100, |
| .width = 10, |
| .height = 10, |
| .c_class = x11::WindowClass::InputOnly, |
| .override_redirect = x11::Bool32(true), |
| }); |
| uint32_t event_mask = ButtonPressMask | ButtonReleaseMask | |
| PointerMotionMask | KeyPressMask | KeyReleaseMask | |
| StructureNotifyMask; |
| grab_input_window_events_ = std::make_unique<ui::XScopedEventSelector>( |
| grab_input_window_, event_mask); |
| connection->MapWindow({grab_input_window_}); |
| RaiseWindow(grab_input_window_); |
| } |
| |
| } // namespace ui |