custom delegate for QSqlRelationalModel

**mak_user** · 19th June 2011, 19:36

This is what I have implemented in my custom delegate:

Qt Code:

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class pcheckboxdelegate : public QStyledItemDelegate
 {
     Q_OBJECT
 
 public:
     pcheckboxdelegate(QObject *parent = 0) : QStyledItemDelegate(parent) {}
 
     QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,
                           const QModelIndex &index) const
     {
         QCheckBox *editor = new QCheckBox(parent);
         return editor;
     }
 
     void setEditorData(QWidget *editor, const QModelIndex &index) const
     {
         bool value = index.model()->data(index, Qt::DisplayRole).toBool();
         QCheckBox *checkBox = static_cast<QCheckBox*>(editor);
         if (value == true ) {
             checkBox->setCheckState(Qt::Checked);
         } else {
             checkBox->setCheckState(Qt::Unchecked);
         }
     }
 
     void setModelData(QWidget *editor, QAbstractItemModel *model,
                       const QModelIndex &index) const
     {
         QCheckBox *checkBox = static_cast<QCheckBox*>(editor);
         if(checkBox->checkState() == Qt::Checked) {
             model->setData(index, true);
         } else {
             model->setData(index, true);
         }
     }
 
     void updateEditorGeometry(QWidget *editor,
         const QStyleOptionViewItem &option, const QModelIndex &index) const
     {
          editor->setGeometry(option.rect);
     }
 };

class pcheckboxdelegate : public QStyledItemDelegate
 {
     Q_OBJECT

 public:
     pcheckboxdelegate(QObject *parent = 0) : QStyledItemDelegate(parent) {}

     QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,
                           const QModelIndex &index) const
     {
         QCheckBox *editor = new QCheckBox(parent);
         return editor;
     }

     void setEditorData(QWidget *editor, const QModelIndex &index) const
     {
         bool value = index.model()->data(index, Qt::DisplayRole).toBool();
         QCheckBox *checkBox = static_cast<QCheckBox*>(editor);
         if (value == true ) {
             checkBox->setCheckState(Qt::Checked);
         } else {
             checkBox->setCheckState(Qt::Unchecked);
         }
     }

     void setModelData(QWidget *editor, QAbstractItemModel *model,
                       const QModelIndex &index) const
     {
         QCheckBox *checkBox = static_cast<QCheckBox*>(editor);
         if(checkBox->checkState() == Qt::Checked) {
             model->setData(index, true);
         } else {
             model->setData(index, true);
         }
     }

     void updateEditorGeometry(QWidget *editor,
         const QStyleOptionViewItem &option, const QModelIndex &index) const
     {
          editor->setGeometry(option.rect);
     }
 };

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I am trying to achieve that I get checkbox in the cell for boolean type in database instead of true or false text that I am getting.
With this code I can only see checkbox after doubleclick on the cell. Even then "true" text stays in the cell.
Could you help me implement delegate that would always show checkbox and I will not have to doubleclick the cell to use it?

**joyer83** · 20th June 2011, 08:48

If check box is all you need, then you can use the default delegate. It can render checkboxes if you set Qt::CheckStateRole role to one of the values of Qt::CheckState.