From 1d7ce510f7cbd4a279e6340d038b37cd5e2dbc63 Mon Sep 17 00:00:00 2001
From: WarmUpTill <WarmUpTill@web.de>
Date: Fri, 14 Jul 2023 19:25:17 +0200
Subject: [PATCH] Add SwitchButton

Simple switch toogle button widget based on
https://github.com/KDAB/kdabtv/blob/master/Styling-Qt-Widgets/toggleswitch.h
---
 CMakeLists.txt              |   2 +
 src/utils/switch-button.cpp | 102 ++++++++++++++++++++++++++++++++++++
 src/utils/switch-button.hpp |  37 +++++++++++++
 3 files changed, 141 insertions(+)
 create mode 100644 src/utils/switch-button.cpp
 create mode 100644 src/utils/switch-button.hpp

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d230339d..058d1e36 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -302,6 +302,8 @@ target_sources(
           src/utils/string-list.hpp
           src/utils/striped-frame.cpp
           src/utils/striped-frame.hpp
+          src/utils/switch-button.cpp
+          src/utils/switch-button.hpp
           src/utils/sync-helper.cpp
           src/utils/sync-helper.hpp
           src/utils/transition-selection.cpp
diff --git a/src/utils/switch-button.cpp b/src/utils/switch-button.cpp
new file mode 100644
index 00000000..dd1bfd50
--- /dev/null
+++ b/src/utils/switch-button.cpp
@@ -0,0 +1,102 @@
+#include "switch-button.hpp"
+
+#include <QMouseEvent>
+#include <QPainter>
+#include <QPalette>
+
+namespace advss {
+
+static const int s_height = 20;
+static const int s_innerMargin = 4;
+static const int s_handleSize = s_height - s_innerMargin * 2;
+static const int s_width = s_handleSize * 2 + s_innerMargin * 2;
+
+SwitchButton::SwitchButton(QWidget *parent) : QWidget{parent}
+{
+	setSizePolicy({QSizePolicy::Fixed, QSizePolicy::Fixed});
+	setFocusPolicy(Qt::TabFocus);
+	setAttribute(Qt::WA_Hover);
+}
+
+void SwitchButton::setChecked(bool checked)
+{
+	if (_checked == checked) {
+		return;
+	}
+	_checked = checked;
+	emit toggled(checked);
+	update();
+}
+
+bool SwitchButton::isChecked() const
+{
+	return _checked;
+}
+
+void SwitchButton::toggle()
+{
+	setChecked(!_checked);
+}
+
+QSize SwitchButton::sizeHint() const
+{
+	return QSize(s_width, s_height);
+}
+
+void SwitchButton::paintEvent(QPaintEvent *)
+{
+	QPainter painter(this);
+	painter.setRenderHint(QPainter::Antialiasing);
+	QPalette pal = palette();
+
+	if (!isEnabled()) {
+		painter.setPen(pal.color(QPalette::Midlight));
+		painter.setOpacity(0.5);
+	} else if (_mouseDown) {
+		painter.setPen(pal.color(QPalette::Light));
+	} else if (underMouse() || hasFocus()) {
+		painter.setPen(QPen(pal.brush(QPalette::Highlight), 1));
+	} else {
+		painter.setPen(pal.color(QPalette::Midlight));
+	}
+
+	if (_checked) {
+		painter.setBrush(pal.color(QPalette::Button));
+	}
+	const qreal radius = height() / 2;
+	painter.drawRoundedRect(QRectF(rect()).adjusted(0.5, 0.5, -0.5, -0.5),
+				radius, radius);
+
+	// Now draw the handle
+	QRect valueRect = rect().adjusted(s_innerMargin, s_innerMargin,
+					  -s_innerMargin, -s_innerMargin);
+	valueRect.setWidth(valueRect.height());
+
+	if (_checked) {
+		valueRect.moveLeft(width() / 2);
+	}
+	painter.setBrush(pal.color(QPalette::Base));
+	painter.drawEllipse(valueRect);
+}
+
+void SwitchButton::mousePressEvent(QMouseEvent *event)
+{
+	if (event->button() == Qt::LeftButton) {
+		_mouseDown = true;
+	} else {
+		event->ignore();
+	}
+}
+
+void SwitchButton::mouseReleaseEvent(QMouseEvent *event)
+{
+	if (event->button() == Qt::LeftButton && _mouseDown) {
+		_mouseDown = false;
+		toggle();
+		emit checked(_checked);
+	} else {
+		event->ignore();
+	}
+}
+
+} // namespace advss
diff --git a/src/utils/switch-button.hpp b/src/utils/switch-button.hpp
new file mode 100644
index 00000000..9e1e7400
--- /dev/null
+++ b/src/utils/switch-button.hpp
@@ -0,0 +1,37 @@
+#pragma once
+#include <QWidget>
+
+namespace advss {
+
+/*
+Simple switch toogle button widget
+Based on https://github.com/KDAB/kdabtv/blob/master/Styling-Qt-Widgets/toggleswitch.h
+*/
+class SwitchButton : public QWidget {
+	Q_OBJECT
+
+public:
+	explicit SwitchButton(QWidget *parent = nullptr);
+
+	void setChecked(bool checked);
+	bool isChecked() const;
+
+	void toggle();
+
+	QSize sizeHint() const override;
+
+signals:
+	void checked(bool checked); // by user
+	void toggled(bool checked); // by user or by program
+
+protected:
+	void paintEvent(QPaintEvent *event) override;
+	void mousePressEvent(QMouseEvent *event) override;
+	void mouseReleaseEvent(QMouseEvent *event) override;
+
+private:
+	bool _checked = false;
+	bool _mouseDown = false;
+};
+
+} // namespace advss