ENH: Add support for showing combo box for choosing from a list of strings that a cache property can have.

Source/QtDialog/QCMake.cxx

@@ -286,6 +286,10 @@ QCMakePropertyList QCMake::properties() const
     else if(i.GetType() == cmCacheManager::STRING)
       {
       prop.Type = QCMakeProperty::STRING;
+      if (i.PropertyExists("STRINGS"))
+        {
+        prop.Strings = QString(i.GetProperty("STRINGS")).split(";");
+        }
       }
 
     ret.append(prop);

Source/QtDialog/QCMake.h

@@ -38,6 +38,7 @@ struct QCMakeProperty
   enum PropertyType { BOOL, PATH, FILEPATH, STRING };
   QString Key;
   QVariant Value;
+  QStringList Strings;
   QString Help;
   PropertyType Type;
   bool Advanced;

Source/QtDialog/QCMakeCacheView.cxx

@@ -365,6 +365,11 @@ void QCMakeCacheModel::setPropertyData(const QModelIndex& idx1,
   }
   this->setData(idx2, prop.Help, QCMakeCacheModel::HelpRole);
 
+  if (!prop.Strings.isEmpty())
+  {
+    this->setData(idx1, prop.Strings, QCMakeCacheModel::StringsRole);
+  }
+
   if(isNew)
   {
     this->setData(idx1, QBrush(QColor(255,100,100)), Qt::BackgroundColorRole);
@@ -381,6 +386,7 @@ void QCMakeCacheModel::getPropertyData(const QModelIndex& idx1,
   prop.Help = this->data(idx1, HelpRole).toString();
   prop.Type = static_cast<QCMakeProperty::PropertyType>(this->data(idx1, TypeRole).toInt());
   prop.Advanced = this->data(idx1, AdvancedRole).toBool();
+  prop.Strings = this->data(idx1, QCMakeCacheModel::StringsRole).toStringList();
   if(prop.Type == QCMakeProperty::BOOL)
   {
     int check = this->data(idx2, Qt::CheckStateRole).toInt();
@@ -572,8 +578,18 @@ QWidget* QCMakeCacheModelDelegate::createEditor(QWidget* p,
         SLOT(setFileDialogFlag(bool)));
     return editor;
     }
+  else if(type == QCMakeProperty::STRING &&
+          var.data(QCMakeCacheModel::StringsRole).isValid())
+    {
+    QCMakeComboBox* editor = 
+      new QCMakeComboBox(p, var.data(QCMakeCacheModel::StringsRole).toStringList());
+    editor->setFrame(false);
+    return editor;
+    }
 
-  return new QLineEdit(p);
+  QLineEdit* editor = new QLineEdit(p);
+  editor->setFrame(false);
+  return editor;
 }
 
 bool QCMakeCacheModelDelegate::editorEvent(QEvent* e, QAbstractItemModel* model, 

Source/QtDialog/QCMakeCacheView.h

@@ -70,7 +70,8 @@ public:
   // properties, and the advanced flag
   enum { HelpRole = Qt::ToolTipRole,
          TypeRole = Qt::UserRole, 
-         AdvancedRole };
+         AdvancedRole,
+         StringsRole};
 
   enum ViewType { FlatView, GroupView };
 

Source/QtDialog/QCMakeWidgets.h

@@ -19,6 +19,7 @@
 #define QCMakeWidgets_h
 
 #include <QLineEdit>
+#include <QComboBox>
 #include <QCompleter>
 class QToolButton;
 
@@ -67,5 +68,25 @@ public:
   virtual QString pathFromIndex(const QModelIndex& idx) const;
 };
 
+// editor for strings
+class QCMakeComboBox : public QComboBox
+{
+  Q_OBJECT
+  Q_PROPERTY(QString value READ currentText WRITE setValue USER true);
+public:
+  QCMakeComboBox(QWidget* p, QStringList strings) : QComboBox(p)
+  {
+    this->addItems(strings);
+  }
+  void setValue(const QString& v)
+  {
+    int i = this->findText(v);
+    if(i != -1)
+    {
+      this->setCurrentIndex(i);
+    }
+  }
+};
+
 #endif