add focusController class

client/ui/controllers/focusController.h

@@ -0,0 +1,52 @@
+#ifndef FOCUSCONTROLLER_H
+#define FOCUSCONTROLLER_H
+
+#include <QObject>
+
+class QQuickItem;
+class QQmlApplicationEngine;
+class ListViewFocusController;
+
+class FocusController : public QObject
+{
+    Q_OBJECT
+public:
+    explicit FocusController(QQmlApplicationEngine* engine, QObject *parent = nullptr);
+    ~FocusController() override = default;
+
+    Q_INVOKABLE void nextKeyTabItem();
+    Q_INVOKABLE void previousKeyTabItem();
+    Q_INVOKABLE void nextKeyUpItem();
+    Q_INVOKABLE void nextKeyDownItem();
+    Q_INVOKABLE void nextKeyLeftItem();
+    Q_INVOKABLE void nextKeyRightItem();
+
+signals:
+    void nextTabItemChanged(QObject* item);
+    void previousTabItemChanged(QObject* item);
+    void nextKeyUpItemChanged(QObject* item);
+    void nextKeyDownItemChanged(QObject* item);
+    void nextKeyLeftItemChanged(QObject* item);
+    void nextKeyRightItemChanged(QObject* item);
+    void focusChainChanged();
+    void rootItemChanged();
+
+public slots:
+    void resetFocus();
+    void reload();
+    void setRootItem(QQuickItem* item);
+
+private:
+    void focusNextListViewItem();
+    void focusPreviousListViewItem();
+
+    QQmlApplicationEngine* m_engine; // Pointer to engine to get root object
+    QList<QObject*> m_focusChain; // List of current objects to be focused
+    QQuickItem* m_focusedItem; // Pointer to the active focus item
+    qsizetype m_focusedItemIndex; // Active focus item's index in focus chain
+    QQuickItem* m_rootItem;
+
+    ListViewFocusController* m_lvfc; // ListView focus manager
+};
+
+#endif // FOCUSCONTROLLER_H