Workaround quickwidget cursor position issue

CMakeLists.txt

@@ -16,7 +16,7 @@ include(ECMSetupVersion)
 include(ECMGenerateHeaders)
 include(ECMUninstallTarget)
 
-find_package(Qt5 ${REQUIRED_QT5_VERSION} CONFIG REQUIRED Core DBus Widgets X11Extras)
+find_package(Qt5 ${REQUIRED_QT5_VERSION} CONFIG REQUIRED Core DBus Widgets X11Extras QuickWidgets)
 find_package(XCB REQUIRED COMPONENTS XCB)
 find_package(Qt5Gui ${REQUIRED_QT5_VERSION} REQUIRED Private)
 find_package(XKBCommon 0.5.0 REQUIRED COMPONENTS XKBCommon)

qt5/platforminputcontext/CMakeLists.txt

@@ -24,6 +24,7 @@ target_link_libraries(fcitx5platforminputcontextplugin
                           Qt5::Gui
                           Qt5::DBus
                           Qt5::X11Extras
+                          Qt5::QuickWidgets
                           XCB::XCB
                           Fcitx5::Utils
                           Fcitx5Qt5::DBusAddons

qt5/platforminputcontext/qfcitxplatforminputcontext.cpp

@@ -18,10 +18,13 @@
  */
 
 #include <QDBusConnection>
+#include <QDebug>
 #include <QGuiApplication>
 #include <QInputMethod>
 #include <QKeyEvent>
 #include <QPalette>
+#include <QQuickItem>
+#include <QQuickWidget>
 #include <QTextCharFormat>
 #include <QTextCodec>
 #include <QWindow>
@@ -379,6 +382,22 @@ void QFcitxPlatformInputContext::cursorRectChanged() {
         return;
     }
 
+    // QQuickWidget workaround.
+    auto obj = qApp->focusObject();
+    if (auto quickwidget = qobject_cast<QQuickWidget *>(obj)) {
+        auto realObj = quickwidget->quickWindow()->focusObject();
+
+        if (auto quickitem = qobject_cast<QQuickItem *>(realObj)) {
+            QInputMethodQueryEvent query(Qt::ImCursorRectangle);
+            QGuiApplication::sendEvent(realObj, &query);
+            auto rect = query.value(Qt::ImCursorRectangle).toRectF();
+            r = qApp->inputMethod()
+                    ->inputItemTransform()
+                    .mapRect(quickitem->mapRectToScene(rect))
+                    .toRect();
+        }
+    }
+
     qreal scale = inputWindow->devicePixelRatio();
     auto screenGeometry = inputWindow->screen()->geometry();
     auto point = inputWindow->mapToGlobal(r.topLeft());