Doc: Compile standard item model snippets

Fix minor issues (e.g. whitespace, missing semi-colon) in passing.

Done-with: Nico Vertriest <nico.vertriest@qt.io>
Task-number: QTBUG-81486
Change-Id: I46301d37112bddcd38dbff9940d0c22eaae74208
Reviewed-by: Topi Reiniö <topi.reinio@qt.io>

src/gui/doc/snippets/code/code.pro

@@ -12,4 +12,5 @@ SOURCES = \
     src_gui_image_qimagewriter.cpp \
     src_gui_image_qmovie.cpp \
     src_gui_image_qpixmapcache.cpp \
-    src_gui_image_qpixmap.cpp
+    src_gui_image_qpixmap.cpp \
+    src_gui_itemviews_qstandarditemmodel.cpp

src/gui/doc/snippets/code/src_gui_itemviews_qstandarditemmodel.cpp

@@ -47,6 +47,20 @@
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/
+#include <QStandardItemModel>
+#include <QTreeView>
+#include <QWidget>
+
+namespace src_gui_itemviews_qstandarditemmodel {
+struct MyWidget : public QWidget
+{
+    void wrapper2();
+    void clicked(const QModelIndex &index);
+    QModelIndex index() { return QModelIndex(); }
+    QStandardItemModel *myStandardItemModel;
+};
+
+void wrapper0() {
 
 //! [0]
 QStandardItemModel model(4, 4);
@@ -58,6 +72,10 @@ for (int row = 0; row < model.rowCount(); ++row) {
 }
 //! [0]
 
+} // wrapper0
+
+
+void wrapper1() {
 
 //! [1]
 QStandardItemModel model;
@@ -69,7 +87,10 @@ for (int i = 0; i < 4; ++i) {
 }
 //! [1]
 
+} // wrapper1
 
+
+void MyWidget::wrapper2() {
 //! [2]
 QTreeView *treeView = new QTreeView(this);
 treeView->setModel(myStandardItemModel);
@@ -77,6 +98,8 @@ connect(treeView, &QTreeView::clicked,
         this, &MyWidget::clicked);
 //! [2]
 
+} // wrapper2
+
 
 //! [3]
 void MyWidget::clicked(const QModelIndex &index)
@@ -87,6 +110,12 @@ void MyWidget::clicked(const QModelIndex &index)
 //! [3]
 
 
+void wrapper3() {
+QTreeView *treeView = nullptr;
+MyWidget *item = nullptr;
 //! [4]
 treeView->scrollTo(item->index());
 //! [4]
+
+} // wrapper3
+} // src_gui_itemviews_qstandarditemmodel