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// 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 "build/build_config.h"
#include "ui/aura/client/cursor_client.h"
#include "ui/aura/client/drag_drop_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/base/hit_test.h"
#include "ui/events/event.h"
#include "ui/wm/public/activation_client.h"
#if defined(OS_CHROMEOS) && defined(USE_X11)
#include "ui/events/devices/x11/touch_factory_x11.h" // nogncheck
#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::CursorType::kSouthResize;
case HTBOTTOMLEFT:
return ui::CursorType::kSouthWestResize;
case HTBOTTOMRIGHT:
return ui::CursorType::kSouthEastResize;
case HTLEFT:
return ui::CursorType::kWestResize;
case HTRIGHT:
return ui::CursorType::kEastResize;
case HTTOP:
return ui::CursorType::kNorthResize;
case HTTOPLEFT:
return ui::CursorType::kNorthWestResize;
case HTTOPRIGHT:
return ui::CursorType::kNorthEastResize;
default:
return ui::CursorType::kNull;
}
}
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) {
for (ui::EventHandler& handler : handlers_) {
if (event->stopped_propagation())
break;
handler.OnKeyEvent(event);
}
}
void CompoundEventFilter::FilterMouseEvent(ui::MouseEvent* event) {
for (ui::EventHandler& handler : handlers_) {
if (event->stopped_propagation())
break;
handler.OnMouseEvent(event);
}
}
void CompoundEventFilter::FilterTouchEvent(ui::TouchEvent* event) {
for (ui::EventHandler& handler : handlers_) {
if (event->stopped_propagation())
break;
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());
// 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,
!(event->flags() & ui::EF_DIRECT_INPUT));
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) {
for (ui::EventHandler& handler : handlers_) {
if (event->stopped_propagation())
break;
handler.OnGestureEvent(event);
}
}
} // namespace wm
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