Documentation: Update CommonTableModel/StringListModel snippets

Update CommonTableModel/StringListModel snippets:
  - 0 -> nullptr
  - use 'override'
  - replace "" with QString()
  - use QStringLiteral instead QString
  - pass role to dataChanged() signal

Change-Id: I5949d1bd6fee3186f12191f1f6235ae18908096e
Reviewed-by: Topi Reiniö <topi.reinio@qt.io>

4 files changed, 28 insertions, 28 deletions

diff --git a/src/widgets/doc/snippets/common-table-model/model.cpp b/src/widgets/doc/snippets/common-table-model/model.cpp
index 96df100f26..2f6e9f1144 100644
--- a/src/widgets/doc/snippets/common-table-model/model.cpp
+++ b/src/widgets/doc/snippets/common-table-model/model.cpp
@@ -68,7 +68,7 @@ TableModel::TableModel(int rows, int columns, QObject *parent)
     QStringList newList;
 
     for (int column = 0; column < qMax(1, columns); ++column) {
-        newList.append("");
+        newList.append(QString());
     }
 
     for (int row = 0; row < qMax(1, rows); ++row) {
@@ -129,9 +129,9 @@ QVariant TableModel::headerData(int section, Qt::Orientation orientation,
         return QVariant();
 
     if (orientation == Qt::Horizontal)
-        return QString("Column %1").arg(section);
+        return QStringLiteral("Column %1").arg(section);
     else
-        return QString("Row %1").arg(section);
+        return QStringLiteral("Row %1").arg(section);
 }
 
 /*!
@@ -164,7 +164,7 @@ bool TableModel::setData(const QModelIndex &index,
         return false;
 
     rowList[index.row()][index.column()] = value.toString();
-    emit dataChanged(index, index);
+    emit dataChanged(index, index, {role});
     return true;
 }
 
@@ -180,7 +180,7 @@ bool TableModel::insertRows(int position, int rows, const QModelIndex &parent)
     for (int row = 0; row < rows; ++row) {
         QStringList items;
         for (int column = 0; column < columns; ++column)
-            items.append("");
+            items.append(QString());
         rowList.insert(position, items);
     }
 
@@ -202,7 +202,7 @@ bool TableModel::insertColumns(int position, int columns,
 
     for (int row = 0; row < rows; ++row) {
         for (int column = position; column < columns; ++column) {
-            rowList[row].insert(position, "");
+            rowList[row].insert(position, QString());
         }
     }
 
diff --git a/src/widgets/doc/snippets/common-table-model/model.h b/src/widgets/doc/snippets/common-table-model/model.h
index 68e6c00702..5f152e0e78 100644
--- a/src/widgets/doc/snippets/common-table-model/model.h
+++ b/src/widgets/doc/snippets/common-table-model/model.h
@@ -60,22 +60,22 @@ class TableModel : public QAbstractTableModel
     Q_OBJECT
 
 public:
-    TableModel(int rows = 1, int columns = 1, QObject *parent = 0);
+    TableModel(int rows = 1, int columns = 1, QObject *parent = nullptr);
 
-    int rowCount(const QModelIndex &parent = QModelIndex()) const;
-    int columnCount(const QModelIndex &parent = QModelIndex()) const;
-    QVariant data(const QModelIndex &index, int role) const;
+    int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+    int columnCount(const QModelIndex &parent = QModelIndex()) const override;
+    QVariant data(const QModelIndex &index, int role) const override;
     QVariant headerData(int section, Qt::Orientation orientation,
-                        int role = Qt::DisplayRole) const;
+                        int role = Qt::DisplayRole) const override;
 
-    Qt::ItemFlags flags(const QModelIndex &index) const;
+    Qt::ItemFlags flags(const QModelIndex &index) const override;
     bool setData(const QModelIndex &index, const QVariant &value,
-                 int role = Qt::EditRole);
+                 int role = Qt::EditRole) override;
 
-    bool insertRows(int position, int rows, const QModelIndex &parent = QModelIndex());
-    bool insertColumns(int position, int columns, const QModelIndex &parent = QModelIndex());
-    bool removeRows(int position, int rows, const QModelIndex &parent = QModelIndex());
-    bool removeColumns(int position, int columns, const QModelIndex &parent = QModelIndex());
+    bool insertRows(int position, int rows, const QModelIndex &parent = QModelIndex()) override;
+    bool insertColumns(int position, int columns, const QModelIndex &parent = QModelIndex()) override;
+    bool removeRows(int position, int rows, const QModelIndex &parent = QModelIndex()) override;
+    bool removeColumns(int position, int columns, const QModelIndex &parent = QModelIndex()) override;
 
 private:
     QList<QStringList> rowList;
diff --git a/src/widgets/doc/snippets/stringlistmodel/model.cpp b/src/widgets/doc/snippets/stringlistmodel/model.cpp
index f07f6b254f..52e78847d2 100644
--- a/src/widgets/doc/snippets/stringlistmodel/model.cpp
+++ b/src/widgets/doc/snippets/stringlistmodel/model.cpp
@@ -135,9 +135,9 @@ QVariant StringListModel::headerData(int section, Qt::Orientation orientation,
         return QVariant();
 
     if (orientation == Qt::Horizontal)
-        return QString("Column %1").arg(section);
+        return QStringLiteral("Column %1").arg(section);
     else
-        return QString("Row %1").arg(section);
+        return QStringLiteral("Row %1").arg(section);
 }
 //! [2]
 
@@ -174,7 +174,7 @@ bool StringListModel::setData(const QModelIndex &index,
     if (index.isValid() && role == Qt::EditRole) {
 
         stringList.replace(index.row(), value.toString());
-        emit dataChanged(index, index);
+        emit dataChanged(index, index, {role});
         return true;
     }
 //! [4] //! [5]
diff --git a/src/widgets/doc/snippets/stringlistmodel/model.h b/src/widgets/doc/snippets/stringlistmodel/model.h
index 50769ef67f..7012152b27 100644
--- a/src/widgets/doc/snippets/stringlistmodel/model.h
+++ b/src/widgets/doc/snippets/stringlistmodel/model.h
@@ -61,26 +61,26 @@ class StringListModel : public QAbstractListModel
     Q_OBJECT
 
 public:
-    StringListModel(const QStringList &strings, QObject *parent = 0)
+    StringListModel(const QStringList &strings, QObject *parent = nullptr)
         : QAbstractListModel(parent), stringList(strings) {}
 
-    int rowCount(const QModelIndex &parent = QModelIndex()) const;
-    QVariant data(const QModelIndex &index, int role) const;
+    int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+    QVariant data(const QModelIndex &index, int role) const override;
     QVariant headerData(int section, Qt::Orientation orientation,
 //! [0] //! [1]
-                        int role = Qt::DisplayRole) const;
+                        int role = Qt::DisplayRole) const override;
 //! [1]
 
 //! [2]
-    Qt::ItemFlags flags(const QModelIndex &index) const;
+    Qt::ItemFlags flags(const QModelIndex &index) const override;
     bool setData(const QModelIndex &index, const QVariant &value,
 //! [2] //! [3]
-                 int role = Qt::EditRole);
+                 int role = Qt::EditRole) override;
 //! [3]
 
 //! [4]
-    bool insertRows(int position, int rows, const QModelIndex &index = QModelIndex());
-    bool removeRows(int position, int rows, const QModelIndex &index = QModelIndex());
+    bool insertRows(int position, int rows, const QModelIndex &index = QModelIndex()) override;
+    bool removeRows(int position, int rows, const QModelIndex &index = QModelIndex()) override;
 //! [4]
 
 //! [5]