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  <title>Qt 4.6: spreadsheetdelegate.cpp Example File (demos/spreadsheet/spreadsheetdelegate.cpp)</title>
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<pre><span class="comment"> /****************************************************************************
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 #include &quot;spreadsheetdelegate.h&quot;
 #include &lt;QtGui&gt;

 SpreadSheetDelegate::SpreadSheetDelegate(QObject *parent)
         : QItemDelegate(parent) {}

 QWidget *SpreadSheetDelegate::createEditor(QWidget *parent,
                                           const QStyleOptionViewItem &amp;,
                                           const QModelIndex &amp;index) const
 {
     if (index.column() == 1) {
         QDateTimeEdit *editor = new QDateTimeEdit(parent);
         editor-&gt;setDisplayFormat(&quot;dd/M/yyyy&quot;);
         editor-&gt;setCalendarPopup(true);
         return editor;
     }

     QLineEdit *editor = new QLineEdit(parent);

     <span class="comment">// create a completer with the strings in the column as model</span>
     QStringList allStrings;
     for (int i = 1; i&lt;index.model()-&gt;rowCount(); i++) {
         QString strItem(index.model()-&gt;data(index.sibling(i, index.column()),
             Qt::EditRole).toString());

         if (!allStrings.contains(strItem))
             allStrings.append(strItem);
     }

     QCompleter *autoComplete = new QCompleter(allStrings);
     editor-&gt;setCompleter(autoComplete);
     connect(editor, SIGNAL(editingFinished()),
         this, SLOT(commitAndCloseEditor()));
     return editor;
 }

 void SpreadSheetDelegate::commitAndCloseEditor()
 {
     QLineEdit *editor = qobject_cast&lt;QLineEdit *&gt;(sender());
     emit commitData(editor);
     emit closeEditor(editor);
 }

 void SpreadSheetDelegate::setEditorData(QWidget *editor,
     const QModelIndex &amp;index) const
 {
     QLineEdit *edit = qobject_cast&lt;QLineEdit*&gt;(editor);
     if (edit) {
         edit-&gt;setText(index.model()-&gt;data(index, Qt::EditRole).toString());
     } else {
         QDateTimeEdit *dateEditor = qobject_cast&lt;QDateTimeEdit *&gt;(editor);
         if (dateEditor) {
             dateEditor-&gt;setDate(QDate::fromString(
             index.model()-&gt;data(index, Qt::EditRole).toString(),
             &quot;d/M/yyyy&quot;));
         }
     }
 }

 void SpreadSheetDelegate::setModelData(QWidget *editor,
     QAbstractItemModel *model, const QModelIndex &amp;index) const
 {
     QLineEdit *edit = qobject_cast&lt;QLineEdit *&gt;(editor);
     if (edit) {
         model-&gt;setData(index, edit-&gt;text());
     } else {
         QDateTimeEdit *dateEditor = qobject_cast&lt;QDateTimeEdit *&gt;(editor);
         if (dateEditor) {
             model-&gt;setData(index, dateEditor-&gt;date().toString(&quot;dd/M/yyyy&quot;));
         }
     }
 }</pre>
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