qtwidgets: Add views for the Classical and Segmented indicators

Copied from indicators/

src/qtwidgets/views/SegmentedIndicatorsOverlay_qtwidgets.h

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+/*
+  This file is part of KDDockWidgets.
+
+  SPDX-FileCopyrightText: 2019-2022 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
+  Author: Sérgio Martins <sergio.martins@kdab.com>
+
+  SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only
+
+  Contact KDAB at <info@kdab.com> for commercial licensing options.
+*/
+
+#pragma once
+
+#include "View_qtwidgets.h"
+
+namespace KDDockWidgets {
+
+class SegmentedIndicators;
+
+namespace Views {
+
+class DOCKS_EXPORT SegmentedIndicatorsOverlay_qtwidgets : public View_qtwidgets<QWidget>
+{
+    Q_OBJECT
+public:
+    explicit SegmentedIndicatorsOverlay_qtwidgets(SegmentedIndicators *controller, QWidget *parent = nullptr);
+    ~SegmentedIndicatorsOverlay_qtwidgets() override;
+
+protected:
+    void paintEvent(QPaintEvent *) override;
+
+private:
+    void drawSegments(QPainter *p);
+    void drawSegment(QPainter *p, const QPolygon &segment);
+    SegmentedIndicators *const m_controller;
+};
+
+}
+
+}