Checkable Combobox

QtWidgets.vcxproj

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+      <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <PreprocessorDefinitions>QTWIDGETS_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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+    <ClCompile Include="src\checkableComboBox.cpp" />
+    <ClCompile Include="src\QtWidgets.cpp" />
+    <QtMoc Include="includes\checkableComboBox.h" />
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QtWidgets.vcxproj.filters

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QtWidgets.vcxproj.user

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+  <PropertyGroup />
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includes/QtWidgets.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include "qtwidgets_global.h"
+
+namespace craftlab::ui
+{
+    class QTWIDGETS_EXPORT QtWidgets
+    {
+    public:
+        QtWidgets();
+    };
+}

includes/checkableComboBox.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <QComboBox>
+#include "qtwidgets_global.h"
+
+namespace craftlab::ui
+{
+	class QTWIDGETS_EXPORT CheckableComboBox : public QComboBox
+	{
+		Q_OBJECT
+	public:
+		CheckableComboBox(QWidget* parent = nullptr);
+
+		void paintEvent(QPaintEvent* e) override;
+
+		void setChecked(bool value);
+		bool isChecked() const;
+
+	private:
+		bool checked = false;
+	};
+}

includes/qtwidgets_global.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <QtCore/qglobal.h>
+
+#ifndef BUILD_STATIC
+# if defined(QTWIDGETS_LIB)
+#  define QTWIDGETS_EXPORT Q_DECL_EXPORT
+# else
+#  define QTWIDGETS_EXPORT Q_DECL_IMPORT
+# endif
+#else
+# define QTWIDGETS_EXPORT
+#endif

src/QtWidgets.cpp

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+#include "QtWidgets.h"
+
+using namespace craftlab::ui;
+
+QtWidgets::QtWidgets()
+{
+}

src/checkableComboBox.cpp

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+#include <QStylePainter>
+#include "checkableComboBox.h"
+
+using namespace craftlab::ui;
+
+CheckableComboBox::CheckableComboBox(QWidget* parent): QComboBox(parent)
+{
+}
+
+void CheckableComboBox::setChecked(bool val)
+{
+    if (checked != val)
+    {
+        checked = val;
+        this->update();
+    }
+}
+
+bool CheckableComboBox::isChecked() const
+{
+	return checked;
+}
+
+void CheckableComboBox::paintEvent(QPaintEvent* e)
+{
+    QStylePainter painter(this);
+    painter.setPen(palette().color(QPalette::Text));
+    QStyleOptionComboBox opt;
+    initStyleOption(&opt);
+
+    if (checked)
+    {
+        QStyleOptionButton option;
+        QRectF downButtonRect = style()->proxy()->subControlRect(QStyle::CC_ComboBox, &opt, QStyle::SC_ComboBoxArrow, this);
+        option.initFrom(this);
+        option.features = QStyleOptionButton::HasMenu;
+        option.state |= QStyle::State_On;
+        option.text = currentText();
+        option.icon = qvariant_cast<QIcon>(currentData(Qt::DecorationRole));
+        option.iconSize = iconSize();
+
+        // Draw button
+        option.rect.adjust(0, 0, downButtonRect.width() +4, 0);
+        painter.drawControl(QStyle::CE_PushButtonBevel, option);
+
+        // Draw button text
+        option.rect.adjust(0, 0, -downButtonRect.width() -4, 0);
+        painter.drawControl(QStyle::CE_PushButtonLabel, option);
+
+        // Draw dropdown button
+        painter.setPen(palette().text().color());
+        painter.drawText(downButtonRect, "\uE019", Qt::AlignVCenter | Qt::AlignHCenter);
+    }
+    else
+    {
+        if (currentIndex() < 0 && !placeholderText().isEmpty()) {
+            opt.palette.setBrush(QPalette::ButtonText, opt.palette.placeholderText());
+            opt.currentText = placeholderText();
+        }
+        painter.drawComplexControl(QStyle::CC_ComboBox, opt);
+        painter.drawControl(QStyle::CE_ComboBoxLabel, opt);
+    }
+}