Implement basic functionality

notificationwidget.h

@@ -0,0 +1,38 @@
+#ifndef NOTIFICATIONWIDGET_H
+#define NOTIFICATIONWIDGET_H
+
+#include <QWidget>
+#include <QLabel>
+#include <QGridLayout>
+#include <QPropertyAnimation>
+
+class NotificationWidget : public QWidget
+{
+    Q_OBJECT
+
+    Q_PROPERTY(float popupOpacity READ getPopupOpacity WRITE setPopupOpacity)
+
+    void setPopupOpacity(float opacity);
+    float getPopupOpacity() const;
+
+public:
+    explicit NotificationWidget(QWidget *parent = nullptr);
+protected:
+    void paintEvent(QPaintEvent *e);
+
+public slots:
+    void setPopupText(const QString& text);
+    void show();
+    void fadeOut();
+
+private slots:
+    void hideAndDestroy();
+
+private:
+    QLabel label;
+    QGridLayout layout;
+    QPropertyAnimation animation;
+    float popupOpacity;
+};
+
+#endif // NOTIFICATIONWIDGET_H