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inc/spkfocuslineedit.h

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+
+#pragma once
+
+#include <QtWidgets/QLineEdit>
+
+class SpkFocusLineEdit final : public QLineEdit
+{
+    Q_OBJECT
+  public:
+    explicit SpkFocusLineEdit(QWidget *parent = nullptr) : QLineEdit(parent) {}
+
+  protected:
+    void focusInEvent(QFocusEvent *e) override { emit focusGained(); }
+    void focusOutEvent(QFocusEvent *e) override { emit focusLost(); }
+
+  signals:
+    void focusGained();
+    void focusLost();
+};