diff options
Diffstat (limited to 'chromium/ui/wm/core/compound_event_filter.cc')
| -rw-r--r-- | chromium/ui/wm/core/compound_event_filter.cc | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/chromium/ui/wm/core/compound_event_filter.cc b/chromium/ui/wm/core/compound_event_filter.cc new file mode 100644 index 00000000000..d1f652c02f6 --- /dev/null +++ b/chromium/ui/wm/core/compound_event_filter.cc @@ -0,0 +1,263 @@ +// 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/wm/core/compound_event_filter.h" + +#include "base/containers/hash_tables.h" +#include "base/logging.h" +#include "ui/aura/client/cursor_client.h" +#include "ui/aura/env.h" +#include "ui/aura/window.h" +#include "ui/aura/window_delegate.h" +#include "ui/aura/window_event_dispatcher.h" +#include "ui/aura/window_tracker.h" +#include "ui/base/hit_test.h" +#include "ui/events/event.h" +#include "ui/wm/public/activation_client.h" +#include "ui/wm/public/drag_drop_client.h" + +#if defined(OS_CHROMEOS) && defined(USE_X11) +#include "ui/events/x/touch_factory_x11.h" +#endif + +namespace wm { + +namespace { + +// Returns true if the cursor should be hidden on touch events. +// TODO(tdanderson|rsadam): Move this function into CursorClient. +bool ShouldHideCursorOnTouch(const ui::TouchEvent& event) { +#if defined(OS_WIN) + return true; +#elif defined(OS_CHROMEOS) +#if defined(USE_X11) + int device_id = event.source_device_id(); + if (device_id >= 0 && + !ui::TouchFactory::GetInstance()->IsMultiTouchDevice(device_id)) { + // If the touch event is coming from a mouse-device (i.e. not a real + // touch-device), then do not hide the cursor. + return false; + } +#endif // defined(USE_X11) + return true; +#else + // Linux Aura does not hide the cursor on touch by default. + // TODO(tdanderson): Change this if having consistency across + // all platforms which use Aura is desired. + return false; +#endif +} + +} // namespace + +//////////////////////////////////////////////////////////////////////////////// +// CompoundEventFilter, public: + +CompoundEventFilter::CompoundEventFilter() { +} + +CompoundEventFilter::~CompoundEventFilter() { + // Additional filters are not owned by CompoundEventFilter and they + // should all be removed when running here. |handlers_| has + // check_empty == true and will DCHECK failure if it is not empty. +} + +// static +gfx::NativeCursor CompoundEventFilter::CursorForWindowComponent( + int window_component) { + switch (window_component) { + case HTBOTTOM: + return ui::kCursorSouthResize; + case HTBOTTOMLEFT: + return ui::kCursorSouthWestResize; + case HTBOTTOMRIGHT: + return ui::kCursorSouthEastResize; + case HTLEFT: + return ui::kCursorWestResize; + case HTRIGHT: + return ui::kCursorEastResize; + case HTTOP: + return ui::kCursorNorthResize; + case HTTOPLEFT: + return ui::kCursorNorthWestResize; + case HTTOPRIGHT: + return ui::kCursorNorthEastResize; + default: + return ui::kCursorNull; + } +} + +void CompoundEventFilter::AddHandler(ui::EventHandler* handler) { + handlers_.AddObserver(handler); +} + +void CompoundEventFilter::RemoveHandler(ui::EventHandler* handler) { + handlers_.RemoveObserver(handler); +} + +//////////////////////////////////////////////////////////////////////////////// +// CompoundEventFilter, private: + +void CompoundEventFilter::UpdateCursor(aura::Window* target, + ui::MouseEvent* event) { + // If drag and drop is in progress, let the drag drop client set the cursor + // instead of setting the cursor here. + aura::Window* root_window = target->GetRootWindow(); + aura::client::DragDropClient* drag_drop_client = + aura::client::GetDragDropClient(root_window); + if (drag_drop_client && drag_drop_client->IsDragDropInProgress()) + return; + + aura::client::CursorClient* cursor_client = + aura::client::GetCursorClient(root_window); + if (cursor_client) { + gfx::NativeCursor cursor = target->GetCursor(event->location()); + if ((event->flags() & ui::EF_IS_NON_CLIENT)) { + if (target->delegate()) { + int window_component = + target->delegate()->GetNonClientComponent(event->location()); + cursor = CursorForWindowComponent(window_component); + } else { + // Allow the OS to handle non client cursors if we don't have a + // a delegate to handle the non client hittest. + return; + } + } + cursor_client->SetCursor(cursor); + } +} + +void CompoundEventFilter::FilterKeyEvent(ui::KeyEvent* event) { + if (handlers_.might_have_observers()) { + ObserverListBase<ui::EventHandler>::Iterator it(handlers_); + ui::EventHandler* handler; + while (!event->stopped_propagation() && (handler = it.GetNext()) != NULL) + handler->OnKeyEvent(event); + } +} + +void CompoundEventFilter::FilterMouseEvent(ui::MouseEvent* event) { + if (handlers_.might_have_observers()) { + ObserverListBase<ui::EventHandler>::Iterator it(handlers_); + ui::EventHandler* handler; + while (!event->stopped_propagation() && (handler = it.GetNext()) != NULL) + handler->OnMouseEvent(event); + } +} + +void CompoundEventFilter::FilterTouchEvent(ui::TouchEvent* event) { + if (handlers_.might_have_observers()) { + ObserverListBase<ui::EventHandler>::Iterator it(handlers_); + ui::EventHandler* handler; + while (!event->stopped_propagation() && (handler = it.GetNext()) != NULL) + handler->OnTouchEvent(event); + } +} + +void CompoundEventFilter::SetCursorVisibilityOnEvent(aura::Window* target, + ui::Event* event, + bool show) { + if (event->flags() & ui::EF_IS_SYNTHESIZED) + return; + + aura::client::CursorClient* client = + aura::client::GetCursorClient(target->GetRootWindow()); + if (!client) + return; + + if (show) + client->ShowCursor(); + else + client->HideCursor(); +} + +void CompoundEventFilter::SetMouseEventsEnableStateOnEvent(aura::Window* target, + ui::Event* event, + bool enable) { + if (event->flags() & ui::EF_IS_SYNTHESIZED) + return; + aura::client::CursorClient* client = + aura::client::GetCursorClient(target->GetRootWindow()); + if (!client) + return; + + if (enable) + client->EnableMouseEvents(); + else + client->DisableMouseEvents(); +} + +//////////////////////////////////////////////////////////////////////////////// +// CompoundEventFilter, ui::EventHandler implementation: + +void CompoundEventFilter::OnKeyEvent(ui::KeyEvent* event) { + aura::Window* target = static_cast<aura::Window*>(event->target()); + aura::client::CursorClient* client = + aura::client::GetCursorClient(target->GetRootWindow()); + if (client && client->ShouldHideCursorOnKeyEvent(*event)) + SetCursorVisibilityOnEvent(target, event, false); + + FilterKeyEvent(event); +} + +void CompoundEventFilter::OnMouseEvent(ui::MouseEvent* event) { + aura::Window* window = static_cast<aura::Window*>(event->target()); + aura::WindowTracker window_tracker; + window_tracker.Add(window); + + // We must always update the cursor, otherwise the cursor can get stuck if an + // event filter registered with us consumes the event. + // It should also update the cursor for clicking and wheels for ChromeOS boot. + // When ChromeOS is booted, it hides the mouse cursor but immediate mouse + // operation will show the cursor. + // We also update the cursor for mouse enter in case a mouse cursor is sent to + // outside of the root window and moved back for some reasons (e.g. running on + // on Desktop for testing, or a bug in pointer barrier). + if (!(event->flags() & ui::EF_FROM_TOUCH) && + (event->type() == ui::ET_MOUSE_ENTERED || + event->type() == ui::ET_MOUSE_MOVED || + event->type() == ui::ET_MOUSE_PRESSED || + event->type() == ui::ET_MOUSEWHEEL)) { + SetMouseEventsEnableStateOnEvent(window, event, true); + SetCursorVisibilityOnEvent(window, event, true); + UpdateCursor(window, event); + } + + FilterMouseEvent(event); +} + +void CompoundEventFilter::OnScrollEvent(ui::ScrollEvent* event) { +} + +void CompoundEventFilter::OnTouchEvent(ui::TouchEvent* event) { + FilterTouchEvent(event); + if (!event->handled() && event->type() == ui::ET_TOUCH_PRESSED && + ShouldHideCursorOnTouch(*event) && + !aura::Env::GetInstance()->IsMouseButtonDown()) { + SetMouseEventsEnableStateOnEvent( + static_cast<aura::Window*>(event->target()), event, false); + } +} + +void CompoundEventFilter::OnGestureEvent(ui::GestureEvent* event) { + if (handlers_.might_have_observers()) { + ObserverListBase<ui::EventHandler>::Iterator it(handlers_); + ui::EventHandler* handler; + while (!event->stopped_propagation() && (handler = it.GetNext()) != NULL) + handler->OnGestureEvent(event); + } + +#if defined(OS_WIN) + // A Win8 edge swipe event is a special event that does not have location + // information associated with it, and is not preceeded by an ET_TOUCH_PRESSED + // event. So we treat it specially here. + if (!event->handled() && event->type() == ui::ET_GESTURE_WIN8_EDGE_SWIPE && + !aura::Env::GetInstance()->IsMouseButtonDown()) { + SetMouseEventsEnableStateOnEvent( + static_cast<aura::Window*>(event->target()), event, false); + } +#endif +} + +} // namespace wm |