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Telegram/SourceFiles/media/view/media_view_playback_progress.cpp

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+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#include "media/view/media_view_playback_progress.h"
+
+#include "media/audio/media_audio.h"
+#include "styles/style_media_view.h"
+
+namespace Media {
+namespace View {
+namespace {
+
+constexpr auto kPlaybackAnimationDurationMs = crl::time(200);
+
+} // namespace
+
+PlaybackProgress::PlaybackProgress()
+: _valueAnimation([=](crl::time now) {
+	return valueAnimationCallback(now);
+})
+, _availableTillAnimation([=](crl::time now) {
+	return availableTillAnimationCallback(now);
+}) {
+}
+
+void PlaybackProgress::updateState(
+		const Player::TrackState &state,
+		float64 loadedTillPercent) {
+	_playing = !Player::IsStopped(state.state);
+	const auto length = state.length;
+	const auto position = Player::IsStoppedAtEnd(state.state)
+		? state.length
+		: Player::IsStoppedOrStopping(state.state)
+		? 0
+		: state.position;
+	const auto receivedTill = (length && state.receivedTill > position)
+		? state.receivedTill
+		: -1;
+	const auto loadedTill = (loadedTillPercent != 0.)
+		? int64(std::floor(loadedTillPercent * length))
+		: -1;
+	const auto availableTill = (length && loadedTill > position)
+		? std::max(receivedTill, loadedTill)
+		: receivedTill;
+
+	const auto wasInLoadingState = _inLoadingState;
+	if (wasInLoadingState) {
+		_inLoadingState = false;
+		if (_inLoadingStateChanged) {
+			_inLoadingStateChanged(false);
+		}
+	}
+
+	const auto progress = (position > length)
+		? 1.
+		: length
+		? std::clamp(float64(position) / length, 0., 1.)
+		: 0.;
+	const auto availableTillProgress = (availableTill > position)
+		? std::clamp(float64(availableTill) / length, 0., 1.)
+		: -1.;
+	const auto animatedPosition = position + (state.frequency * kPlaybackAnimationDurationMs / 1000);
+	const auto animatedProgress = length ? qMax(float64(animatedPosition) / length, 0.) : 0.;
+	if (length != _length || position != _position || wasInLoadingState) {
+		const auto animated = length
+			&& _length
+			&& (animatedProgress > value())
+			&& (position > _position)
+			&& (position < _position + state.frequency);
+		if (animated) {
+			setValue(animatedProgress, animated);
+		} else {
+			setValue(progress, animated);
+		}
+		_position = position;
+		_length = length;
+	}
+	if (availableTill != _availableTill) {
+		setAvailableTill(availableTillProgress);
+		_availableTill = availableTill;
+	}
+}
+
+void PlaybackProgress::updateLoadingState(float64 progress) {
+	if (!_inLoadingState) {
+		_inLoadingState = true;
+		if (_inLoadingStateChanged) {
+			_inLoadingStateChanged(true);
+		}
+	}
+	auto animated = (progress > value());
+	setValue(progress, animated);
+}
+
+float64 PlaybackProgress::value() const {
+	return qMin(a_value.current(), 1.);
+}
+
+void PlaybackProgress::setValue(float64 value, bool animated) {
+	if (animated) {
+		valueAnimationCallback(crl::now());
+		a_value.start(value);
+		_valueAnimation.start();
+	} else {
+		a_value = anim::value(value, value);
+		_valueAnimation.stop();
+	}
+	emitUpdatedValue();
+}
+
+void PlaybackProgress::setAvailableTill(float64 value) {
+	const auto current = a_availableTill.current();
+	if (value > current && current > 0.) {
+		availableTillAnimationCallback(crl::now());
+		a_availableTill.start(value);
+		_availableTillAnimation.start();
+	} else if (value > a_value.current()) {
+		a_availableTill = anim::value(a_value.current(), value);
+		_availableTillAnimation.start();
+	} else {
+		a_availableTill = anim::value(-1., -1.);
+		_availableTillAnimation.stop();
+	}
+	emitUpdatedValue();
+}
+
+bool PlaybackProgress::valueAnimationCallback(float64 now) {
+	const auto time = (now - _valueAnimation.started());
+	const auto dt = anim::Disabled()
+		? 1.
+		: (time / kPlaybackAnimationDurationMs);
+	if (dt >= 1.) {
+		a_value.finish();
+	} else {
+		a_value.update(dt, anim::linear);
+	}
+	emitUpdatedValue();
+	return (dt < 1.);
+}
+
+bool PlaybackProgress::availableTillAnimationCallback(float64 now) {
+	const auto time = now - _availableTillAnimation.started();
+	const auto dt = anim::Disabled()
+		? 1.
+		: (time / kPlaybackAnimationDurationMs);
+	if (dt >= 1.) {
+		a_availableTill.finish();
+	} else {
+		a_availableTill.update(dt, anim::linear);
+	}
+	emitUpdatedValue();
+	return (dt < 1.);
+}
+
+void PlaybackProgress::emitUpdatedValue() {
+	if (_valueChanged) {
+		const auto value = a_value.current();
+		const auto availableTill = a_availableTill.current();
+		_valueChanged(value, std::max(value, availableTill));
+	}
+}
+
+} // namespace View
+} // namespace Media