openpilot is an open source driver assistance system. openpilot performs the functions of Automated Lane Centering and Adaptive Cruise Control for over 200 supported car makes and models.

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#include "selfdrive/ui/qt/widgets/controls.h"
#include <QPainter>
#include <QStyleOption>
AbstractControl::AbstractControl(const QString &title, const QString &desc, const QString &icon, QWidget *parent) : QFrame(parent) {
QVBoxLayout *main_layout = new QVBoxLayout(this);
main_layout->setMargin(0);
hlayout = new QHBoxLayout;
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hlayout->setMargin(0);
hlayout->setSpacing(20);
// left icon
icon_label = new QLabel();
if (!icon.isEmpty()) {
icon_pixmap = QPixmap(icon).scaledToWidth(80, Qt::SmoothTransformation);
icon_label->setPixmap(icon_pixmap);
icon_label->setSizePolicy(QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed));
hlayout->addWidget(icon_label);
}
// title
title_label = new QPushButton(title);
title_label->setFixedHeight(120);
title_label->setStyleSheet("font-size: 50px; font-weight: 400; text-align: left; border: none;");
hlayout->addWidget(title_label, 1);
// value next to control button
value = new ElidedLabel();
value->setAlignment(Qt::AlignRight | Qt::AlignVCenter);
value->setStyleSheet("color: #aaaaaa");
hlayout->addWidget(value);
main_layout->addLayout(hlayout);
// description
description = new QLabel(desc);
description->setContentsMargins(40, 20, 40, 20);
description->setStyleSheet("font-size: 40px; color: grey");
description->setWordWrap(true);
description->setVisible(false);
main_layout->addWidget(description);
connect(title_label, &QPushButton::clicked, [=]() {
if (!description->isVisible()) {
emit showDescriptionEvent();
}
if (!description->text().isEmpty()) {
description->setVisible(!description->isVisible());
}
});
main_layout->addStretch();
}
void AbstractControl::hideEvent(QHideEvent *e) {
if (description != nullptr) {
description->hide();
}
}
// controls
ButtonControl::ButtonControl(const QString &title, const QString &text, const QString &desc, QWidget *parent) : AbstractControl(title, desc, "", parent) {
btn.setText(text);
btn.setStyleSheet(R"(
QPushButton {
padding: 0;
border-radius: 50px;
font-size: 35px;
font-weight: 500;
color: #E4E4E4;
background-color: #393939;
}
QPushButton:pressed {
background-color: #4a4a4a;
}
QPushButton:disabled {
color: #33E4E4E4;
}
)");
btn.setFixedSize(250, 100);
QObject::connect(&btn, &QPushButton::clicked, this, &ButtonControl::clicked);
hlayout->addWidget(&btn);
}
// ElidedLabel
ElidedLabel::ElidedLabel(QWidget *parent) : ElidedLabel({}, parent) {}
ElidedLabel::ElidedLabel(const QString &text, QWidget *parent) : QLabel(text.trimmed(), parent) {
setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
setMinimumWidth(1);
}
void ElidedLabel::resizeEvent(QResizeEvent* event) {
QLabel::resizeEvent(event);
lastText_ = elidedText_ = "";
}
void ElidedLabel::paintEvent(QPaintEvent *event) {
const QString curText = text();
if (curText != lastText_) {
elidedText_ = fontMetrics().elidedText(curText, Qt::ElideRight, contentsRect().width());
lastText_ = curText;
}
QPainter painter(this);
drawFrame(&painter);
QStyleOption opt;
opt.initFrom(this);
style()->drawItemText(&painter, contentsRect(), alignment(), opt.palette, isEnabled(), elidedText_, foregroundRole());
}