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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/views/animation/ink_drop_event_handler.h"
#include <memory>
#include <string_view>
#include "build/build_config.h"
#include "ui/events/scoped_target_handler.h"
#include "ui/views/animation/ink_drop.h"
#include "ui/views/animation/ink_drop_state.h"
#include "ui/views/widget/widget.h"
namespace views {
namespace {
bool InkDropStateIsVisible(InkDropState state) {
return state != InkDropState::HIDDEN && state != InkDropState::DEACTIVATED;
}
} // namespace
InkDropEventHandler::InkDropEventHandler(View* host_view, Delegate* delegate)
: target_handler_(
std::make_unique<ui::ScopedTargetHandler>(host_view, this)),
host_view_(host_view),
delegate_(delegate) {
observation_.Observe(host_view_.get());
}
InkDropEventHandler::~InkDropEventHandler() = default;
void InkDropEventHandler::AnimateToState(InkDropState state,
const ui::LocatedEvent* event) {
#if BUILDFLAG(IS_WIN)
// On Windows, don't initiate ink-drops for touch/gesture events.
// Additionally, certain event states should dismiss existing ink-drop
// animations. If the state is already other than HIDDEN, presumably from
// a mouse or keyboard event, then the state should be allowed. Conversely,
// if the requested state is ACTIVATED, then it should always be allowed.
if (event && (event->IsTouchEvent() || event->IsGestureEvent()) &&
delegate_->GetInkDrop()->GetTargetInkDropState() ==
InkDropState::HIDDEN &&
state != InkDropState::ACTIVATED) {
return;
}
#endif
last_ripple_triggering_event_.reset(
event ? event->Clone().release()->AsLocatedEvent() : nullptr);
// If no ink drop exists and we are not transitioning to a visible ink drop
// state the transition have no visual effect. The call to GetInkDrop() will
// lazily create the ink drop when called. Avoid creating the ink drop in
// these cases to prevent the creation of unnecessary layers.
if (delegate_->HasInkDrop() || InkDropStateIsVisible(state)) {
delegate_->GetInkDrop()->AnimateToState(state);
}
}
ui::LocatedEvent* InkDropEventHandler::GetLastRippleTriggeringEvent() const {
return last_ripple_triggering_event_.get();
}
void InkDropEventHandler::OnGestureEvent(ui::GestureEvent* event) {
if (!host_view_->GetEnabled() || !delegate_->SupportsGestureEvents()) {
return;
}
InkDropState current_ink_drop_state =
delegate_->GetInkDrop()->GetTargetInkDropState();
InkDropState ink_drop_state = InkDropState::HIDDEN;
switch (event->type()) {
case ui::EventType::kGestureTapDown:
if (current_ink_drop_state == InkDropState::ACTIVATED) {
return;
}
ink_drop_state = InkDropState::ACTION_PENDING;
break;
case ui::EventType::kGestureLongPress:
if (current_ink_drop_state == InkDropState::ACTIVATED) {
return;
}
ink_drop_state = InkDropState::ALTERNATE_ACTION_PENDING;
break;
case ui::EventType::kGestureLongTap:
ink_drop_state = InkDropState::ALTERNATE_ACTION_TRIGGERED;
break;
case ui::EventType::kGestureEnd:
case ui::EventType::kGestureScrollBegin:
case ui::EventType::kGestureTapCancel:
if (current_ink_drop_state == InkDropState::ACTIVATED) {
return;
}
ink_drop_state = InkDropState::HIDDEN;
break;
default:
return;
}
if (ink_drop_state == InkDropState::HIDDEN &&
(current_ink_drop_state == InkDropState::ACTION_TRIGGERED ||
current_ink_drop_state == InkDropState::ALTERNATE_ACTION_TRIGGERED ||
current_ink_drop_state == InkDropState::DEACTIVATED ||
current_ink_drop_state == InkDropState::HIDDEN)) {
// These InkDropStates automatically transition to the HIDDEN state so we
// don't make an explicit call. Explicitly animating to HIDDEN in this
// case would prematurely pre-empt these animations.
return;
}
AnimateToState(ink_drop_state, event);
}
void InkDropEventHandler::OnMouseEvent(ui::MouseEvent* event) {
switch (event->type()) {
case ui::EventType::kMouseEntered:
delegate_->GetInkDrop()->SetHovered(true);
break;
case ui::EventType::kMouseExited:
delegate_->GetInkDrop()->SetHovered(false);
break;
case ui::EventType::kMouseDragged:
delegate_->GetInkDrop()->SetHovered(
host_view_->GetLocalBounds().Contains(event->location()));
break;
default:
break;
}
}
std::string_view InkDropEventHandler::GetLogContext() const {
return "InkDropEventHandler";
}
void InkDropEventHandler::OnViewVisibilityChanged(View* observed_view,
View* starting_view) {
DCHECK_EQ(host_view_, observed_view);
// A View is *actually* visible if its visible flag is set, all its ancestors'
// visible flags are set, it's in a Widget, and the Widget is
// visible. |View::IsDrawn()| captures the first two conditions.
const bool is_visible = host_view_->IsDrawn() && host_view_->GetWidget() &&
host_view_->GetWidget()->IsVisible();
if (!is_visible && delegate_->HasInkDrop()) {
delegate_->GetInkDrop()->AnimateToState(InkDropState::HIDDEN);
delegate_->GetInkDrop()->SetHovered(false);
}
}
void InkDropEventHandler::OnViewHierarchyChanged(
View* observed_view,
const ViewHierarchyChangedDetails& details) {
DCHECK_EQ(host_view_, observed_view);
// If we're being removed hide the ink-drop so if we're highlighted now the
// highlight won't be active if we're added back again.
if (!details.is_add && details.child == host_view_ &&
delegate_->HasInkDrop()) {
delegate_->GetInkDrop()->SnapToHidden();
delegate_->GetInkDrop()->SetHovered(false);
}
}
void InkDropEventHandler::OnViewBoundsChanged(View* observed_view) {
DCHECK_EQ(host_view_, observed_view);
if (delegate_->HasInkDrop()) {
delegate_->GetInkDrop()->HostSizeChanged(host_view_->size());
}
}
void InkDropEventHandler::OnViewFocused(View* observed_view) {
DCHECK_EQ(host_view_, observed_view);
delegate_->GetInkDrop()->SetFocused(true);
}
void InkDropEventHandler::OnViewBlurred(View* observed_view) {
DCHECK_EQ(host_view_, observed_view);
delegate_->GetInkDrop()->SetFocused(false);
}
void InkDropEventHandler::OnViewThemeChanged(View* observed_view) {
CHECK_EQ(host_view_, observed_view);
// The call to GetInkDrop() will lazily create the ink drop when called. We do
// not want to create the ink drop when view theme changed.
if (delegate_->HasInkDrop()) {
delegate_->GetInkDrop()->HostViewThemeChanged();
}
}
} // namespace views
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