qtquick: Move remaining contents from old/ into views/

They are not ported yet, bet let's do things in batches so we have less
context switches.

src/qtquick/DockWidgetInstantiator.h

@@ -0,0 +1,118 @@
+/*
+  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.
+*/
+
+#ifndef KD_DOCKWIDGET_INSTANTIATOR_P_H
+#define KD_DOCKWIDGET_INSTANTIATOR_P_H
+
+#include "DockWidgetQuick.h"
+
+#include <QQmlParserStatus>
+#include <QQuickItem>
+#include <QString>
+
+#include <optional>
+
+namespace KDDockWidgets {
+
+class DockWidgetQuick;
+
+/**
+ * @brief Indirection helper to instantiate dock widgets from QML
+ *
+ * "DockWidget {}" in QML won't create a KDDockWidget::DockWidget directly, but instead an
+ * DockWidgetInstantiator. DockWidgetInstantiator will then create the DockWidget instance only
+ * when the QML parsing ends (and all propreties are set)
+ *
+ * This allows to pass the correct uniqueName to DockWidget's ctor.
+ */
+class DockWidgetInstantiator : public QQuickItem
+{
+    Q_OBJECT
+    Q_PROPERTY(QString uniqueName READ uniqueName WRITE setUniqueName NOTIFY uniqueNameChanged)
+    Q_PROPERTY(QString source READ source WRITE setSource NOTIFY sourceChanged)
+    Q_PROPERTY(KDDockWidgets::DockWidgetQuick *dockWidget READ dockWidget NOTIFY dockWidgetChanged)
+    Q_PROPERTY(
+        KDDockWidgets::TitleBar *actualTitleBar READ actualTitleBar NOTIFY actualTitleBarChanged)
+    Q_PROPERTY(QString title READ title WRITE setTitle NOTIFY titleChanged)
+    Q_PROPERTY(bool isFocused READ isFocused NOTIFY isFocusedChanged)
+    Q_PROPERTY(bool isFloating READ isFloating WRITE setFloating NOTIFY isFloatingChanged)
+public:
+    QString uniqueName() const;
+    void setUniqueName(const QString &);
+
+    QString source() const;
+    void setSource(const QString &);
+
+    DockWidgetQuick *dockWidget() const;
+    KDDockWidgets::TitleBar *actualTitleBar() const;
+
+    QString title() const;
+    void setTitle(const QString &title);
+
+    bool isFocused() const;
+    bool isFloating() const;
+    void setFloating(bool);
+
+    Q_INVOKABLE void addDockWidgetAsTab(KDDockWidgets::DockWidgetInstantiator *other,
+                                        KDDockWidgets::InitialVisibilityOption = {});
+    Q_INVOKABLE void addDockWidgetAsTab(KDDockWidgets::DockWidgetBase *other,
+                                        KDDockWidgets::InitialVisibilityOption = {});
+
+    Q_INVOKABLE void addDockWidgetToContainingWindow(KDDockWidgets::DockWidgetBase *other,
+                                                     KDDockWidgets::Location location,
+                                                     KDDockWidgets::DockWidgetBase *relativeTo = nullptr,
+                                                     QSize initialSize = {},
+                                                     KDDockWidgets::InitialVisibilityOption = {});
+
+    Q_INVOKABLE void addDockWidgetToContainingWindow(KDDockWidgets::DockWidgetInstantiator *other,
+                                                     KDDockWidgets::Location location,
+                                                     KDDockWidgets::DockWidgetInstantiator *relativeTo = nullptr,
+                                                     QSize initialSize = {},
+                                                     KDDockWidgets::InitialVisibilityOption = {});
+
+    Q_INVOKABLE void setAsCurrentTab();
+    Q_INVOKABLE void forceClose();
+    Q_INVOKABLE bool close();
+    Q_INVOKABLE void show();
+    Q_INVOKABLE void raise();
+    Q_INVOKABLE void moveToSideBar();
+
+protected:
+    void classBegin() override;
+    void componentComplete() override;
+
+Q_SIGNALS:
+    void uniqueNameChanged();
+    void sourceChanged();
+    void dockWidgetChanged();
+    void actualTitleBarChanged();
+    void titleChanged(const QString &title);
+    void shown();
+    void hidden();
+    void iconChanged();
+    void widgetChanged(KDDockWidgets::QWidgetOrQuick *);
+    void optionsChanged(KDDockWidgets::DockWidgetBase::Options);
+    void isFocusedChanged(bool);
+    void isOverlayedChanged(bool);
+    void isFloatingChanged(bool);
+    void removedFromSideBar();
+    void windowActiveAboutToChange(bool activated);
+
+private:
+    std::optional<bool> m_isFloating;
+    QString m_uniqueName;
+    QString m_sourceFilename;
+    QString m_title;
+    DockWidgetQuick *m_dockWidget = nullptr;
+};
+}
+
+#endif