Add Platform::focusedView() and respective signal

Implemented as QGuiApplication::focusObjectChanged() for Qt,
other frontends will have their own impl.

src/qtquick/Platform_qtquick.cpp

@@ -13,7 +13,9 @@
 #include "KDDockWidgets.h"
 // #include "QmlTypes.h" // TODOv2
 
+#include "views/View_qtquick.h"
 #include <QQuickWindow>
+#include <QGuiApplication>
 
 static KDDockWidgets::Platform_qtquick s_platformQtQuick;
 
@@ -25,6 +27,11 @@ Platform_qtquick::Platform_qtquick()
 {
     // KDDockWidgets::registerQmlTypes(); // TODOv2
     QQuickWindow::setDefaultAlphaBuffer(true);
+
+    qApp->connect(qApp, &QGuiApplication::focusObjectChanged, qApp, [this](QObject *obj) {
+        ViewWrapper *wrapper = new Views::ViewWrapper_qtquick(obj);
+        focusedViewChanged.emit(std::shared_ptr<ViewWrapper>(wrapper));
+    });
 }
 
 Platform_qtquick::~Platform_qtquick()
@@ -35,3 +42,13 @@ const char *Platform_qtquick::name() const
 {
     return "qtquick";
 }
+
+std::shared_ptr<ViewWrapper> Platform_qtquick::focusedView() const
+{
+    if (auto item = qobject_cast<QQuickItem *>(qApp->focusObject())) {
+        ViewWrapper *wrapper = new Views::ViewWrapper_qtquick(item);
+        return std::shared_ptr<ViewWrapper>(wrapper);
+    }
+
+    return {};
+}