Fix wxComboBox implementation of wxTextEntry interface

Implement missing methods and send, or suppress, the expected events.

include/wx/qt/combobox.h

@@ -52,7 +52,7 @@ public:
                 const wxValidator& validator = wxDefaultValidator,
                 const wxString& name = wxComboBoxNameStr);
 
-    virtual void SetSelection(int n) wxOVERRIDE { wxChoice::SetSelection(n); }
+    virtual void SetSelection(int n) wxOVERRIDE;
     virtual void SetSelection(long from, long to) wxOVERRIDE;
 
     virtual int GetSelection() const wxOVERRIDE { return wxChoice::GetSelection(); }
@@ -70,6 +70,12 @@ public:
     bool IsTextEmpty() const { return wxTextEntry::IsEmpty(); }
 
     virtual void SetValue(const wxString& value) wxOVERRIDE;
+    virtual void ChangeValue(const wxString& value) wxOVERRIDE;
+    virtual void AppendText(const wxString &value) wxOVERRIDE;
+    virtual void Replace(long from, long to, const wxString &value) wxOVERRIDE;
+    virtual void WriteText(const wxString &value) wxOVERRIDE;
+    virtual void SetInsertionPoint(long insertion) wxOVERRIDE;
+    virtual long GetInsertionPoint() const wxOVERRIDE;
 
     virtual void Popup();
     virtual void Dismiss();
@@ -80,6 +86,7 @@ protected:
     virtual wxString DoGetValue() const wxOVERRIDE;
 
 private:
+    void SetActualValue(const wxString& value);
 
     // From wxTextEntry:
     virtual wxWindow *GetEditableWindow() wxOVERRIDE { return this; }

src/qt/combobox.cpp

@@ -23,13 +23,37 @@ public:
     virtual void showPopup() wxOVERRIDE;
     virtual void hidePopup() wxOVERRIDE;
 
+    class IgnoreTextChange
+    {
+    public:
+        // Note that wxComboBox inherits its QComboBox pointer from wxChoice,
+        // where it can't be stored as wxQtComboBox, but its dynamic type is
+        // nevertheless always wxQtComboBox, so the cast below is safe.
+        explicit IgnoreTextChange(QComboBox *combo)
+            : m_combo(static_cast<wxQtComboBox*>(combo))
+        {
+            m_combo->m_textChangeIgnored = true;
+        }
+
+        ~IgnoreTextChange()
+        {
+            m_combo->m_textChangeIgnored = false;
+        }
+
+    private:
+        wxQtComboBox* m_combo;
+    };
+
 private:
     void activated(int index);
     void editTextChanged(const QString &text);
+
+    bool m_textChangeIgnored;
 };
 
 wxQtComboBox::wxQtComboBox( wxWindow *parent, wxComboBox *handler )
-    : wxQtEventSignalHandler< QComboBox, wxComboBox >( parent, handler )
+    : wxQtEventSignalHandler< QComboBox, wxComboBox >( parent, handler ),
+      m_textChangeIgnored( false )
 {
     setEditable( true );
     connect(this, static_cast<void (QComboBox::*)(int index)>(&QComboBox::activated),
@@ -61,6 +85,9 @@ void wxQtComboBox::activated(int WXUNUSED(index))
 
 void wxQtComboBox::editTextChanged(const QString &text)
 {
+    if ( m_textChangeIgnored )
+        return;
+
     wxComboBox *handler = GetHandler();
     if ( handler )
     {
@@ -70,6 +97,11 @@ void wxQtComboBox::editTextChanged(const QString &text)
     }
 }
 
+void wxComboBox::SetSelection( int n )
+{
+    wxQtComboBox::IgnoreTextChange ignore( m_qtComboBox );
+    wxChoice::SetSelection( n );
+}
 
 wxComboBox::wxComboBox()
 {
@@ -137,10 +169,12 @@ bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
     return QtCreateControl( parent, id, pos, size, style, validator, name );
 }
 
-void wxComboBox::SetValue(const wxString& value)
+void wxComboBox::SetActualValue(const wxString &value)
 {
     if ( HasFlag(wxCB_READONLY) )
-        SetStringSelection(value);
+    {
+        SetStringSelection( value );
+    }
     else
     {
         wxTextEntry::SetValue(value);
@@ -148,6 +182,56 @@ void wxComboBox::SetValue(const wxString& value)
     }
 }
 
+void wxComboBox::SetValue(const wxString& value)
+{
+    SetActualValue( value );
+    SetInsertionPoint( 0 );
+}
+
+void wxComboBox::ChangeValue(const wxString &value)
+{
+    wxQtComboBox::IgnoreTextChange ignore( m_qtComboBox );
+    SetValue( value );
+}
+
+void wxComboBox::AppendText(const wxString &value)
+{
+    SetActualValue( GetValue() + value );
+}
+
+void wxComboBox::Replace(long from, long to, const wxString &value)
+{
+    const wxString original( GetValue() );
+
+    if ( to < 0 )
+    {
+        to = original.length();
+    }
+
+    if ( from == 0 )
+    {
+        SetActualValue( value + original.substr(to, original.length()) );
+    }
+
+    wxString front = original.substr( 0, from ) + value;
+
+    long iPoint = front.length();
+    if ( front.length() <= original.length() )
+    {
+        SetActualValue( front + original.substr(to, original.length()) );
+    }
+    else
+    {
+        SetActualValue( front );
+    }
+    SetInsertionPoint( iPoint );
+}
+
+void wxComboBox::WriteText(const wxString &value)
+{
+    m_qtComboBox->lineEdit()->insert( wxQtConvertString( value ) );
+}
+
 wxString wxComboBox::DoGetValue() const
 {
     return wxQtConvertString( m_qtComboBox->currentText() );
@@ -171,15 +255,40 @@ void wxComboBox::Clear()
 
 void wxComboBox::SetSelection( long from, long to )
 {
-    // SelectAll uses -1 to -1, adjust for qt:
-    if (from == -1 && to == -1)
+    if ( from == -1 )
     {
         from = 0;
+    }
+    if ( to == -1 )
+    {
         to = GetValue().length();
     }
+
+    SetInsertionPoint( from );
     // use the inner text entry widget (note that can be null if not editable)
     if ( m_qtComboBox->lineEdit() != NULL )
-        m_qtComboBox->lineEdit()->setSelection(from, to);
+    {
+        m_qtComboBox->lineEdit()->setSelection( from, to - from );
+    }
+}
+
+void wxComboBox::SetInsertionPoint( long pos )
+{
+    // check if pos indicates end of text:
+    if ( pos == -1 )
+        m_qtComboBox->lineEdit()->end( false );
+    else
+        m_qtComboBox->lineEdit()->setCursorPosition( pos );
+}
+
+long wxComboBox::GetInsertionPoint() const
+{
+    long selectionStart = m_qtComboBox->lineEdit()->selectionStart();
+
+    if ( selectionStart >= 0 )
+        return selectionStart;
+
+    return m_qtComboBox->lineEdit()->cursorPosition();
 }
 
 void wxComboBox::GetSelection(long* from, long* to) const