Attribute Editor: Synchronize editable QComboBox for LineEdit's and similar.

Fixes http://hub.qgis.org/issues/6647

Author: m-kuhn

src/gui/qgsattributeeditor.cpp

@@ -136,12 +136,13 @@ QWidget *QgsAttributeEditor::createAttributeEditor( QWidget *parent, QWidget *ed
   if ( !vl )
     return 0;
 
-  bool synchronized = false;
   QWidget *myWidget = 0;
   QgsVectorLayer::EditType editType = vl->editType( idx );
   const QgsField &field = vl->pendingFields()[idx];
   QVariant::Type myFieldType = field.type();
 
+  bool synchronized = false;
+
   switch ( editType )
   {
     case QgsVectorLayer::UniqueValues:
@@ -438,12 +439,14 @@ QWidget *QgsAttributeEditor::createAttributeEditor( QWidget *parent, QWidget *ed
       QLineEdit *le = 0;
       QTextEdit *te = 0;
       QPlainTextEdit *pte = 0;
+      QComboBox * cb = 0;
 
       if ( editor )
       {
         le = qobject_cast<QLineEdit *>( editor );
         te = qobject_cast<QTextEdit *>( editor );
         pte = qobject_cast<QPlainTextEdit *>( editor );
+        cb = qobject_cast<QComboBox *>( editor );
       }
       else if ( editType == QgsVectorLayer::TextEdit )
       {
@@ -491,15 +494,42 @@ QWidget *QgsAttributeEditor::createAttributeEditor( QWidget *parent, QWidget *ed
         myWidget = pte;
       }
 
+      if ( cb )
+      {
+        myWidget = cb;
+      }
+
       if ( myWidget )
       {
         myWidget->setDisabled( editType == QgsVectorLayer::Immutable );
 
+        QgsStringRelay* relay = NULL;
+
         QMap<int, QWidget*>::const_iterator it = proxyWidgets.find( idx );
         if ( it != proxyWidgets.end() )
         {
-          synchronized =  connect( *it, SIGNAL( textChanged( QString ) ), myWidget, SLOT( setText( QString ) ) );
-          synchronized &= connect( myWidget, SIGNAL( textChanged( QString ) ), *it, SLOT( setText( QString ) ) );
+          QObject* obj = qvariant_cast<QObject*>( (*it)->property( "QgisAttrEditProxy" ) );
+          relay = qobject_cast<QgsStringRelay*>( obj );
+        }
+        else
+        {
+          relay = new QgsStringRelay( myWidget );
+        }
+
+        if ( cb && cb->isEditable() )
+        {
+          synchronized =  connect( relay, SIGNAL( textChanged( QString ) ), myWidget, SLOT( setEditText( QString ) ) );
+          synchronized &= connect( myWidget, SIGNAL( editTextChanged( QString ) ), relay, SLOT( changeText( QString ) ) );
+        }
+        else
+        {
+          synchronized =  connect( relay, SIGNAL( textChanged( QString ) ), myWidget, SLOT( setText( QString ) ) );
+          synchronized &= connect( myWidget, SIGNAL( textChanged( QString ) ), relay, SLOT( changeText( QString ) ) );
+        }
+
+        if ( !cb || cb->isEditable() )
+        {
+          myWidget->setProperty( "QgisAttrEditProxy", QVariant( QMetaType::QObjectStar, &relay ) );
         }
       }
     }

src/gui/qgsattributeeditor.h

@@ -18,6 +18,7 @@
 #define QGSATTRIBUTEEDITOR_H
 
 #include <QVariant>
+#include <QMetaType>
 
 #include "qgsfeature.h"
 
@@ -79,5 +80,30 @@ class GUI_EXPORT QgsAttributeEditor : public QObject
     void selectDate();
 };
 
+class QgsStringRelay : public QObject
+{
+  Q_OBJECT
+
+public:
+  QgsStringRelay()
+    : QObject( NULL ) {}
+
+  QgsStringRelay( QObject* parent )
+    : QObject( parent ) {}
+
+  QgsStringRelay( const QgsStringRelay& sr )
+    : QObject( sr.parent() ) {}
+
+public slots:
+  void changeText( QString str )
+  {
+    emit textChanged( str );
+  }
+
+signals:
+  void textChanged( QString );
+};
+
+Q_DECLARE_METATYPE( QgsStringRelay )
 
 #endif