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Telegram/SourceFiles/calls/calls_signal_bars.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 "calls/calls_signal_bars.h"
+
+#include "calls/calls_call.h"
+#include "ui/painter.h"
+#include "styles/style_calls.h"
+
+namespace Calls {
+
+SignalBars::SignalBars(
+	QWidget *parent,
+	not_null<Call*> call,
+	const style::CallSignalBars &st)
+: RpWidget(parent)
+, _st(st)
+, _count(Call::kSignalBarStarting) {
+	resize(
+		_st.width + (_st.width + _st.skip) * (Call::kSignalBarCount - 1),
+		_st.max);
+	call->signalBarCountValue(
+	) | rpl::on_next([=](int count) {
+		changed(count);
+	}, lifetime());
+}
+
+void SignalBars::paintEvent(QPaintEvent *e) {
+	auto p = QPainter(this);
+
+	PainterHighQualityEnabler hq(p);
+	p.setPen(Qt::NoPen);
+	p.setBrush(_st.color);
+	for (auto i = 0; i < Call::kSignalBarCount; ++i) {
+		p.setOpacity((i < _count) ? 1. : _st.inactiveOpacity);
+		const auto barHeight = _st.min
+			+ (_st.max - _st.min) * (i / float64(Call::kSignalBarCount - 1));
+		const auto barLeft = i * (_st.width + _st.skip);
+		const auto barTop = height() - barHeight;
+		p.drawRoundedRect(
+			QRectF(
+				barLeft,
+				barTop,
+				_st.width,
+				barHeight),
+			_st.radius,
+			_st.radius);
+	}
+	p.setOpacity(1.);
+}
+
+void SignalBars::changed(int count) {
+	if (_count == Call::kSignalBarFinished) {
+		return;
+	} else if (_count != count) {
+		_count = count;
+		update();
+	}
+}
+
+} // namespace Calls