tdesktop/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 "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::start_with_next([=](int count) {
changed(count);
}, lifetime());
}
void SignalBars::paintEvent(QPaintEvent *e) {
Painter p(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