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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ash/fast_ink/fast_ink_pointer_controller.h"
#include "ash/constants/ash_pref_names.h"
#include "ash/shell.h"
#include "base/functional/bind.h"
#include "components/prefs/pref_change_registrar.h"
#include "components/prefs/pref_service.h"
#include "ui/aura/window.h"
#include "ui/display/screen.h"
#include "ui/events/base_event_utils.h"
#include "ui/events/types/event_type.h"
#include "ui/views/widget/widget.h"
#include "ui/wm/core/coordinate_conversion.h"
namespace ash {
namespace {
// The amount of time used to estimate time from VSYNC event to when
// visible light can be noticed by the user.
const int kPresentationDelayMs = 18;
} // namespace
FastInkPointerController::FastInkPointerController()
: presentation_delay_(base::Milliseconds(kPresentationDelayMs)) {
auto* local_state = Shell::Get()->local_state();
// |local_state| could be null in tests.
if (!local_state)
return;
pref_change_registrar_local_ = std::make_unique<PrefChangeRegistrar>();
pref_change_registrar_local_->Init(local_state);
pref_change_registrar_local_->Add(
prefs::kHasSeenStylus,
base::BindRepeating(&FastInkPointerController::OnHasSeenStylusPrefChanged,
base::Unretained(this)));
OnHasSeenStylusPrefChanged();
}
FastInkPointerController::~FastInkPointerController() {}
void FastInkPointerController::SetEnabled(bool enabled) {
enabled_ = enabled;
// Not calling DestroyPointerView when disabling, leaving the control over
// the pointer view lifetime to the specific controller implementation.
// For instance, a controller might prefer to keep the pointer view around
// while it is being animated away.
}
void FastInkPointerController::AddExcludedWindow(aura::Window* window) {
DCHECK(window);
excluded_windows_.Add(window);
}
bool FastInkPointerController::CanStartNewGesture(ui::LocatedEvent* event) {
if (IsPointerInExcludedWindows(event))
return false;
// 1) The stylus/finger is pressed.
// 2) The stylus/finger is moving, but the pointer session has not started yet
// (most likely because the preceding press event was consumed by another
// handler).
bool can_start_on_touch_event =
event->type() == ui::EventType::kTouchPressed ||
(event->type() == ui::EventType::kTouchMoved && !GetPointerView());
if (can_start_on_touch_event)
return true;
// 1) The mouse is pressed.
// 2) The mouse is moving, but the pointer session has not started yet
// (most likely because the preceding press event was consumed by another
// handler).
bool can_start_on_mouse_event =
event->type() == ui::EventType::kMousePressed ||
(event->type() == ui::EventType::kMouseMoved && !GetPointerView());
if (can_start_on_mouse_event)
return true;
return false;
}
bool FastInkPointerController::ShouldProcessEvent(ui::LocatedEvent* event) {
return event->type() == ui::EventType::kTouchReleased ||
event->type() == ui::EventType::kTouchMoved ||
event->type() == ui::EventType::kTouchPressed ||
event->type() == ui::EventType::kTouchCancelled ||
event->type() == ui::EventType::kMousePressed ||
event->type() == ui::EventType::kMouseReleased ||
event->type() == ui::EventType::kMouseMoved;
}
bool FastInkPointerController::IsEnabledForMouseEvent() const {
return !has_seen_stylus_ && !pointer_view_created_by_touch_.value_or(false);
}
bool FastInkPointerController::IsPointerInExcludedWindows(
ui::LocatedEvent* event) {
gfx::Point screen_location = event->location();
aura::Window* event_target = static_cast<aura::Window*>(event->target());
wm::ConvertPointToScreen(event_target, &screen_location);
for (const aura::Window* excluded_window : excluded_windows_.windows()) {
if (excluded_window->GetBoundsInScreen().Contains(screen_location)) {
return true;
}
}
return false;
}
bool FastInkPointerController::MaybeCreatePointerView(
ui::LocatedEvent* event,
bool can_start_new_gesture) {
aura::Window* root_window =
static_cast<aura::Window*>(event->target())->GetRootWindow();
if (can_start_new_gesture) {
DestroyPointerView();
CreatePointerView(presentation_delay_, root_window);
pointer_view_created_by_touch_ = event->IsTouchEvent();
} else {
views::View* pointer_view = GetPointerView();
if (!pointer_view)
return false;
views::Widget* widget = pointer_view->GetWidget();
if (widget->IsClosed() ||
widget->GetNativeWindow()->GetRootWindow() != root_window) {
// The pointer widget is no longer valid, end the current pointer session.
DestroyPointerView();
return false;
}
}
return true;
}
void FastInkPointerController::OnTouchEvent(ui::TouchEvent* event) {
const int touch_id = event->pointer_details().id;
// Keep track of touch point count.
if (event->type() == ui::EventType::kTouchPressed) {
touch_ids_.insert(touch_id);
}
if (event->type() == ui::EventType::kTouchReleased ||
event->type() == ui::EventType::kTouchCancelled) {
auto iter = touch_ids_.find(touch_id);
// Can happen if this object is constructed while fingers were down.
if (iter == touch_ids_.end())
return;
touch_ids_.erase(touch_id);
}
if (!enabled_)
return;
// Disable on touch events if the device has stylus.
if (has_seen_stylus_ &&
event->pointer_details().pointer_type != ui::EventPointerType::kPen) {
return;
}
// Disable for multiple fingers touch.
if (touch_ids_.size() > 1) {
DestroyPointerView();
return;
}
if (!ShouldProcessEvent(event))
return;
// Update pointer view and stop event propagation if pointer view is
// available.
if (MaybeCreatePointerView(event, CanStartNewGesture(event))) {
UpdatePointerView(event);
event->StopPropagation();
}
}
void FastInkPointerController::OnMouseEvent(ui::MouseEvent* event) {
if (!enabled_ || !IsEnabledForMouseEvent() || !ShouldProcessEvent(event))
return;
// Update pointer view and stop event propagation if pointer view is
// available.
if (MaybeCreatePointerView(event, CanStartNewGesture(event))) {
UpdatePointerView(event);
event->StopPropagation();
}
}
void FastInkPointerController::OnHasSeenStylusPrefChanged() {
auto* local_state = pref_change_registrar_local_->prefs();
has_seen_stylus_ =
local_state && local_state->GetBoolean(prefs::kHasSeenStylus);
}
void FastInkPointerController::DestroyPointerView() {
pointer_view_created_by_touch_.reset();
}
} // namespace ash
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