qtquick: Ported the old DockWidgetQuick to the new architecture

Mostly anyway. Facing several blockers that need to be ported first,
for example DockWidget::setWidget() is still receiving QWidget

src/qtquick/views/DockWidget_qtquick.h

@@ -16,51 +16,101 @@
  * @author Sérgio Martins \<sergio.martins@kdab.com\>
  */
 
-#pragma once
+#ifndef KD_DOCKWIDGET_QUICK_H
+#define KD_DOCKWIDGET_QUICK_H
 
 #include "controllers/DockWidget.h"
 #include "View_qtquick.h"
 
 QT_BEGIN_NAMESPACE
 class QCloseEvent;
+class QQmlEngine;
 QT_END_NAMESPACE
 
 namespace KDDockWidgets {
 
-namespace Views {
+namespace Controllers {
+class Frame;
+class TitleBar;
+}
 
+namespace Views {
 /**
  * @brief Represents a dock widget.
  *
  * Most of the interface lives in DockWidgetBase, to facilitate sharing with QtQuick.
  */
-class DOCKS_EXPORT DockWidget_qtquick : public View_qtquick<QQuickItem>
+class DOCKS_EXPORT DockWidget_qtquick : public Views::View_qtquick
 {
     Q_OBJECT
+    Q_PROPERTY(QObject *actualTitleBar READ actualTitleBarObj NOTIFY actualTitleBarChanged)
 public:
     /**
      * @brief constructs a new DockWidget
-     * @param uniqueName Mandatory name that should be unique between all DockWidget instances.
-     *        This name won't be user visible and just used internally for the save/restore.
-     *        Use setTitle() for user visible text.
+     * @param uniqueName the name of the dockwidget, should be unique. Use title for user visible text.
      * @param options optional options controlling behaviour
+     * @param layoutSaverOptions options regarding LayoutSaver behaviour
+     * @param engine the QML engine this dock widget will be created on. If not specified then
+     * Config::self().qmlEngine() will be used
      *
      * There's no parent argument. The DockWidget is either parented to FloatingWindow or MainWindow
-     * when visible, or stays without a parent when hidden. This allows to support docking
-     * to different main windows.
+     * when visible, or stays without a parent when hidden.
      */
     explicit DockWidget_qtquick(Controllers::DockWidget *controller,
-                                Qt::WindowFlags windowFlags = {});
+                                Qt::WindowFlags windowFlags = {},
+                                QQmlEngine *engine = nullptr);
 
     ///@brief destructor
     ~DockWidget_qtquick() override;
 
-    Controllers::DockWidget *dockWidget() const;
+    /// Sets the DockWidget's guest item
+    /// Similar to DockWidgetBase::setWidget(QQuickItem*)
+    void setWidget(const QString &qmlFilename);
+
+    /// @reimp
+    // void setWidget(QQuickItem *widget);
+
+    /// @reimp
+    Q_INVOKABLE void setWidget(QQuickItem *widget);
+
+    /// @reimp
+    QSize minSize() const override;
+
+    /// @reimp
+    QSize maximumSize() const override;
+
+    /// @brief Returns the title bar
+    QObject *actualTitleBar() const;
+
+    /// @brief Returns the title bar
+    /// Qt6 requires us to include TitleBar_p.h, so instead the Q_PROPERTY uses
+    /// QObject so we don't include private headers in public headers
+    QObject *actualTitleBarObj() const;
+
+    /// @brief Returns the visual item which represents Frame in the screen
+    /// Equivalent to Frame::visualItem().
+    QQuickItem *frameVisualItem() const;
+
+    ///@internal
+    Q_INVOKABLE KDDockWidgets::Controllers::Frame *frame() const;
+
+    /// @brief Called by QtQuick when min-size changes
+    Q_INVOKABLE void onGeometryUpdated();
+
+Q_SIGNALS:
+    /// @brief The geometry of the frame container this dock widget is in changed
+    /// For example, when dragging a dockwidget
+    void frameGeometryChanged(QRect);
+
+protected:
+    bool event(QEvent *e) override;
 
 private:
-
+    class Private;
+    Private *const d;
 };
 
 }
-
 }
+
+#endif