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// Copyright 2024 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/accessibility/flash_screen_controller.h"
#include "ash/color_enhancement/color_enhancement_controller.h"
#include "ash/shell.h"
#include "ui/accessibility/accessibility_features.h"
#include "ui/message_center/message_center_types.h"
#include "ui/message_center/public/cpp/notification_types.h"
namespace ash {
namespace {
// Duration of the throb animation (on or off).
constexpr auto kNotificationTimerDelay = base::Milliseconds(300);
// The animation will be repeated twice.
constexpr int kNumFlashesPerNotification = 2;
} // namespace
FlashScreenController::FlashScreenController() : throb_animation_{this} {
notification_observer_.Observe(message_center::MessageCenter::Get());
throb_animation_.SetThrobDuration(kNotificationTimerDelay);
}
FlashScreenController::~FlashScreenController() = default;
void FlashScreenController::OnNotificationDisplayed(
const std::string& notification_id,
const message_center::DisplaySource display_source) {
// Only flash when a popup is displayed (not the message center).
if (display_source == message_center::DISPLAY_SOURCE_POPUP) {
MaybeFlashOn(notification_id);
}
}
void FlashScreenController::OnNotificationAdded(
const std::string& notification_id) {
MaybeFlashOn(notification_id);
}
void FlashScreenController::AnimationEnded(const gfx::Animation* animation) {
// AnimationEnded is called at the end of each slide animation (up or down)
// during the throb. Just turn the flash fully off when it's fully done.
if (!throb_animation_.IsShowing()) {
FlashOff();
}
}
void FlashScreenController::AnimationProgressed(
const gfx::Animation* animation) {
const double percent = 1 - animation->GetCurrentValue();
if (percent == 0) {
FlashOff();
return;
}
float r = SkColorGetR(color_);
float g = SkColorGetG(color_);
float b = SkColorGetB(color_);
r = r + (255 - r) * percent;
g = g + (255 - g) * percent;
b = b + (255 - b) * percent;
if (r > 255) {
r = 255;
}
if (g > 255) {
g = 255;
}
if (b > 255) {
b = 255;
}
SkColor color = SkColorSetRGB(r, g, b);
auto* color_enhancement_controller =
Shell::Get()->color_enhancement_controller();
color_enhancement_controller->FlashScreenForNotification(/*show_flash=*/true,
color);
}
void FlashScreenController::AnimationCanceled(const gfx::Animation* animation) {
FlashOff();
}
void FlashScreenController::MaybeFlashOn(const std::string& notification_id) {
auto* message_center = message_center::MessageCenter::Get();
if (!message_center || message_center->IsQuietMode()) {
// Do not flash when in quiet mode.
return;
}
message_center::Notification* notification =
message_center->FindNotificationById(notification_id);
if (!notification || notification->silent()) {
// Do not flash for silent notifications.
return;
}
if (notification->group_parent()) {
// Do not flash for new groupings of notifications (only for individual
// notifications).
return;
}
if (notification->priority() < message_center::DEFAULT_PRIORITY) {
// Do not flash for low priority notifications, as no pop-up will
// be shown.
return;
}
FlashOn();
}
void FlashScreenController::PreviewFlash() {
FlashOn();
}
void FlashScreenController::FlashOn() {
if (!::features::IsAccessibilityFlashScreenFeatureEnabled()) {
return;
}
if (!enabled_) {
// Don't flash if the pref is disabled.
return;
}
if (throb_animation_.is_animating()) {
// Don't start a flash if already flashing.
return;
}
throb_animation_.StartThrobbing(kNumFlashesPerNotification * 2);
}
void FlashScreenController::FlashOff() {
// Turns off the flash.
auto* color_enhancement_controller =
Shell::Get()->color_enhancement_controller();
color_enhancement_controller->FlashScreenForNotification(
/*show_flash=*/false, color_);
}
} // namespace ash
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