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plotwidget.cpp

@@ -0,0 +1,10 @@
+#include "plotwidget.h"
+
+PlotWidget::PlotWidget(QWidget *parent) : QWidget(parent)
+{
+
+}
+void PlotWidget::leaveEvent(QEvent *event)
+{
+    emit leftPlot();
+}

plotwidget.h

@@ -0,0 +1,19 @@
+#ifndef PLOTWIDGET_H
+#define PLOTWIDGET_H
+
+#include <QWidget>
+
+class PlotWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit PlotWidget(QWidget *parent = nullptr);
+
+signals:
+    void leftPlot();
+protected:
+    void leaveEvent(QEvent *event);
+public slots:
+};
+
+#endif // PLOTWIDGET_H