diff --git a/inputcontext/QskHunspellCompositionModel.cpp b/inputcontext/QskHunspellCompositionModel.cpp
index d811908a..ca50f5f6 100644
--- a/inputcontext/QskHunspellCompositionModel.cpp
+++ b/inputcontext/QskHunspellCompositionModel.cpp
@@ -10,8 +10,8 @@ public:
     QVector< QString > candidates;
 };
 
-QskHunspellCompositionModel::QskHunspellCompositionModel() :
-    QskInputCompositionModel(),
+QskHunspellCompositionModel::QskHunspellCompositionModel( QObject* parent ):
+    Inherited( parent ),
     m_data( new PrivateData() )
 {
 #if 1
diff --git a/inputcontext/QskHunspellCompositionModel.h b/inputcontext/QskHunspellCompositionModel.h
index 8ba15e0c..178d3321 100644
--- a/inputcontext/QskHunspellCompositionModel.h
+++ b/inputcontext/QskHunspellCompositionModel.h
@@ -10,8 +10,10 @@
 
 class QskHunspellCompositionModel : public QskInputCompositionModel
 {
+    using Inherited = QskInputCompositionModel;
+
 public:
-    QskHunspellCompositionModel();
+    QskHunspellCompositionModel( QObject* parent = nullptr );
     virtual ~QskHunspellCompositionModel() override;
 
     virtual bool supportsSuggestions() const override final;
diff --git a/inputcontext/QskInputCompositionModel.cpp b/inputcontext/QskInputCompositionModel.cpp
index 96ddd22e..17905e92 100644
--- a/inputcontext/QskInputCompositionModel.cpp
+++ b/inputcontext/QskInputCompositionModel.cpp
@@ -62,7 +62,8 @@ public:
     int groupIndex;
 };
 
-QskInputCompositionModel::QskInputCompositionModel():
+QskInputCompositionModel::QskInputCompositionModel( QObject* parent ):
+    QObject( parent ),
     m_data( new PrivateData )
 {
     m_data->groupIndex = 0;
diff --git a/inputcontext/QskInputCompositionModel.h b/inputcontext/QskInputCompositionModel.h
index 239550b6..5e299ce8 100644
--- a/inputcontext/QskInputCompositionModel.h
+++ b/inputcontext/QskInputCompositionModel.h
@@ -20,7 +20,7 @@ class QskInputCompositionModel : public QObject
     Q_PROPERTY( QVector< Qt::Key > groups READ groups NOTIFY groupsChanged )
 
 public:
-    QskInputCompositionModel();
+    QskInputCompositionModel( QObject* parent = nullptr );
     virtual ~QskInputCompositionModel();
 
     // to determine whether to show the suggestion bar:
diff --git a/inputcontext/QskInputContext.cpp b/inputcontext/QskInputContext.cpp
index 828b5c96..0cd7722b 100644
--- a/inputcontext/QskInputContext.cpp
+++ b/inputcontext/QskInputContext.cpp
@@ -31,7 +31,7 @@ QskInputContext::QskInputContext() :
 {
     setObjectName( "InputContext" );
 
-    m_data->compositionModel = new QskInputCompositionModel();
+    m_data->compositionModel = new QskInputCompositionModel( this );
 
     connect( m_data->compositionModel, &QskInputCompositionModel::candidatesChanged,
         this, &QskInputContext::handleCandidatesChanged );
@@ -40,7 +40,7 @@ QskInputContext::QskInputContext() :
         this, &QskInputContext::setInputPanel );
 
 #if 1
-    setCompositionModel( QLocale::Chinese, new QskPinyinCompositionModel() );
+    setCompositionModel( QLocale::Chinese, new QskPinyinCompositionModel( this ) );
 #endif
 
     setInputPanel( qskSetup->inputPanel() );
@@ -48,11 +48,10 @@ QskInputContext::QskInputContext() :
 
 QskInputContext::~QskInputContext()
 {
+#if 1
     if ( m_data->inputPanel )
         delete m_data->inputPanel;
-
-    qDeleteAll( m_data->compositionModels );
-    delete m_data->compositionModel;
+#endif
 }
 
 bool QskInputContext::isValid() const
@@ -60,14 +59,19 @@ bool QskInputContext::isValid() const
     return true;
 }
 
+bool QskInputContext::hasCapability( Capability ) const
+{
+    // what is QPlatformInputContext::HiddenTextCapability ???
+    return true;
+}
+
 void QskInputContext::update( Qt::InputMethodQueries queries )
 {
-    if ( !m_data->inputItem )
+    if ( m_data->inputItem == nullptr )
         return;
 
     QInputMethodQueryEvent queryEvent( queries );
-    if ( !QCoreApplication::sendEvent( m_data->inputItem, &queryEvent ) )
-        return;
+    QCoreApplication::sendEvent( m_data->inputItem, &queryEvent );
 
     // Qt::ImCursorRectangle
     // Qt::ImFont
@@ -219,6 +223,11 @@ QLocale QskInputContext::locale() const
     return m_data->inputPanel ? m_data->inputPanel->locale() : QLocale();
 }
 
+Qt::LayoutDirection QskInputContext::inputDirection() const
+{
+    return Inherited::inputDirection();
+}
+
 void QskInputContext::setFocusObject( QObject* focusObject )
 {
     if ( focusObject == nullptr )
@@ -245,8 +254,7 @@ void QskInputContext::setFocusObject( QObject* focusObject )
     if( inputItemChanged )
     {
         QInputMethodQueryEvent queryEvent( Qt::ImEnabled );
-        if ( !QCoreApplication::sendEvent( m_data->inputItem, &queryEvent ) )
-            return;
+        QCoreApplication::sendEvent( m_data->inputItem, &queryEvent );
 
         if ( !queryEvent.value( Qt::ImEnabled ).toBool() )
         {
@@ -302,7 +310,7 @@ void QskInputContext::invokeAction( QInputMethod::Action action, int cursorPosit
 {
     auto model = compositionModel();
 
-    switch ( static_cast< QskVirtualKeyboard::Action >( action ) )
+    switch ( static_cast< int >( action ) )
     {
         case QskVirtualKeyboard::Compose:
         {
@@ -323,6 +331,11 @@ void QskInputContext::invokeAction( QInputMethod::Action action, int cursorPosit
 
             break;
         }
+        case QInputMethod::Click:
+        case QInputMethod::ContextMenu:
+        {
+            break;
+        }
     }
 }
 
@@ -382,4 +395,25 @@ void QskInputContext::setInputPanel( QskVirtualKeyboard* inputPanel )
     }
 }
 
+void QskInputContext::reset()
+{
+}
+
+void QskInputContext::commit()
+{
+}
+
+bool QskInputContext::eventFilter( QObject* object, QEvent* event )
+{
+    if ( object == m_data->inputItem )
+        return filterEvent( event );
+
+    return false;
+}
+
+bool QskInputContext::filterEvent( const QEvent* )
+{
+    return false;
+}
+
 #include "moc_QskInputContext.cpp"
diff --git a/inputcontext/QskInputContext.h b/inputcontext/QskInputContext.h
index 470d9f5d..5da3adab 100644
--- a/inputcontext/QskInputContext.h
+++ b/inputcontext/QskInputContext.h
@@ -24,6 +24,7 @@ public:
     virtual ~QskInputContext();
 
     virtual bool isValid() const override;
+    virtual bool hasCapability( Capability ) const override;
 
     virtual void update( Qt::InputMethodQueries ) override;
     virtual void invokeAction( QInputMethod::Action, int ) override;
@@ -35,14 +36,21 @@ public:
     virtual void hideInputPanel() override;
     virtual bool isInputPanelVisible() const override;
 
+    virtual void reset() override;
+    virtual void commit() override;
+
     virtual void setFocusObject( QObject* ) override;
 
     virtual QLocale locale() const override;
+    virtual Qt::LayoutDirection inputDirection() const override;
 
     void setCompositionModel( const QLocale&, QskInputCompositionModel* );
 
     Q_INVOKABLE QQuickItem* inputItem();
 
+    virtual bool eventFilter( QObject*, QEvent * ) override;
+    virtual bool filterEvent( const QEvent* ) override;
+
 private Q_SLOTS:
     void handleCandidatesChanged();
     void setInputPanel( QskVirtualKeyboard* );
diff --git a/inputcontext/QskPinyinCompositionModel.cpp b/inputcontext/QskPinyinCompositionModel.cpp
index d5170ddc..ca515f9e 100644
--- a/inputcontext/QskPinyinCompositionModel.cpp
+++ b/inputcontext/QskPinyinCompositionModel.cpp
@@ -18,8 +18,8 @@ public:
     QVector< Qt::Key > groups;
 };
 
-QskPinyinCompositionModel::QskPinyinCompositionModel():
-    QskInputCompositionModel(),
+QskPinyinCompositionModel::QskPinyinCompositionModel( QObject* parent ):
+    Inherited( parent ),
     m_data( new PrivateData )
 {
 #if 1
@@ -124,5 +124,3 @@ void QskPinyinCompositionModel::handleGroupIndexChanged()
 {
     // ### implement
 }
-
-#include "moc_QskPinyinCompositionModel.cpp"
diff --git a/inputcontext/QskPinyinCompositionModel.h b/inputcontext/QskPinyinCompositionModel.h
index cc0544fa..994edd79 100644
--- a/inputcontext/QskPinyinCompositionModel.h
+++ b/inputcontext/QskPinyinCompositionModel.h
@@ -10,10 +10,10 @@
 
 class QskPinyinCompositionModel : public QskInputCompositionModel
 {
-    Q_OBJECT
+    using Inherited = QskInputCompositionModel;
 
 public:
-    QskPinyinCompositionModel();
+    QskPinyinCompositionModel( QObject* parent = nullptr );
     virtual ~QskPinyinCompositionModel() override;
 
     virtual bool supportsSuggestions() const override final;
diff --git a/src/controls/QskTextInput.cpp b/src/controls/QskTextInput.cpp
index 38f768ff..c0d402bb 100644
--- a/src/controls/QskTextInput.cpp
+++ b/src/controls/QskTextInput.cpp
@@ -24,8 +24,10 @@ static inline void qskBindSignals( const QQuickTextInput* wrappedInput,
     QObject::connect( wrappedInput, &QQuickTextInput::textChanged,
         input, [ input ] { input->Q_EMIT textChanged( input->text() ); } );
 
+#if QT_VERSION >= QT_VERSION_CHECK(5, 9, 0)
     QObject::connect( wrappedInput, &QQuickTextInput::textEdited,
         input, [ input ] { input->Q_EMIT textEdited( input->text() ); } );
+#endif
 
     QObject::connect( wrappedInput, &QQuickTextInput::textChanged,
         input, [ input ] { input->Q_EMIT textChanged( input->text() ); } );
@@ -42,8 +44,10 @@ static inline void qskBindSignals( const QQuickTextInput* wrappedInput,
     QObject::connect( wrappedInput, &QQuickTextInput::readOnlyChanged,
         input, &QskTextInput::readOnlyChanged );
 
+#if QT_VERSION >= QT_VERSION_CHECK(5, 8, 0)
     QObject::connect( wrappedInput, &QQuickTextInput::overwriteModeChanged,
         input, &QskTextInput::overwriteModeChanged );
+#endif
 
     QObject::connect( wrappedInput, &QQuickTextInput::maximumLengthChanged,
         input, &QskTextInput::maximumLengthChanged );
@@ -232,9 +236,12 @@ void QskTextInput::setFontRole( int role )
         polish();
         resetImplicitSize();
 
-        qskUpdateInputMethod( this,
-            Qt::ImCursorRectangle | Qt::ImFont | Qt::ImAnchorRectangle );
+        Qt::InputMethodQueries queries = Qt::ImCursorRectangle | Qt::ImFont;
+#if QT_VERSION >= QT_VERSION_CHECK(5, 7, 0)
+        queries |= Qt::ImAnchorRectangle;
+#endif
 
+        qskUpdateInputMethod( this, queries );
         Q_EMIT fontRoleChanged();
     }
 }
@@ -374,17 +381,29 @@ QString QskTextInput::displayText() const
 
 QString QskTextInput::preeditText() const
 {
+#if QT_VERSION >= QT_VERSION_CHECK(5, 7, 0)
     return m_data->textInput->preeditText();
+#else
+    return QString();
+#endif
 }
 
 bool QskTextInput::overwriteMode() const
 {
+#if QT_VERSION >= QT_VERSION_CHECK(5, 8, 0)
     return m_data->textInput->overwriteMode();
+#else
+    return false;
+#endif
 }
 
 void QskTextInput::setOverwriteMode( bool overwrite )
 {
+#if QT_VERSION >= QT_VERSION_CHECK(5, 8, 0)
     m_data->textInput->setOverwriteMode( overwrite );
+#else
+    Q_UNUSED( overwrite )
+#endif
 }
 
 bool QskTextInput::autoScroll() const