Move MouseWheelWidgetAdjustmentGuard

src/utils/mouse-wheel-guard.cpp

@@ -0,0 +1,31 @@
+#include "mouse-wheel-guard.hpp"
+
+#include <QEvent>
+#include <QScrollBar>
+
+MouseWheelWidgetAdjustmentGuard::MouseWheelWidgetAdjustmentGuard(QObject *parent)
+	: QObject(parent)
+{
+}
+
+bool MouseWheelWidgetAdjustmentGuard::eventFilter(QObject *o, QEvent *e)
+{
+	const QWidget *widget = static_cast<QWidget *>(o);
+	if (e->type() == QEvent::Wheel && widget && !widget->hasFocus()) {
+		e->ignore();
+		return true;
+	}
+
+	return QObject::eventFilter(o, e);
+}
+
+void PreventMouseWheelAdjustWithoutFocus(QWidget *w)
+{
+	w->setFocusPolicy(Qt::StrongFocus);
+	// Ignore QScrollBar as there is no danger of accidentally modifying anything
+	// and long expanded QComboBox would be difficult to interact with otherwise.
+	if (qobject_cast<QScrollBar *>(w)) {
+		return;
+	}
+	w->installEventFilter(new MouseWheelWidgetAdjustmentGuard(w));
+}

src/utils/mouse-wheel-guard.hpp

@@ -0,0 +1,12 @@
+#pragma once
+#include <QWidget>
+
+class MouseWheelWidgetAdjustmentGuard : public QObject {
+public:
+	explicit MouseWheelWidgetAdjustmentGuard(QObject *parent);
+
+protected:
+	bool eventFilter(QObject *o, QEvent *e) override;
+};
+
+void PreventMouseWheelAdjustWithoutFocus(QWidget *);