Cleanup QtWidgets (tools) examples

Cleanup QtWidgets tools examples:
 - use member-init (clang-tidy)
 - fix includes/don't include QtWidgets globally
 - include own header first
 - use nullptr (clang-tidy)
 - avoid c-style casts
 - use QVector instead QList
 - use QItemDelegate instead QStyledItemDelegate

Change-Id: Ibe9440cdf711e5cc2138c054864edebe1fc95731
Reviewed-by: Paul Wicking <paul.wicking@qt.io>

1 files changed, 6 insertions, 7 deletions

diff --git a/examples/widgets/tools/settingseditor/settingstree.h b/examples/widgets/tools/settingseditor/settingstree.h
index 15efa0e6aa..3e9e9658ce 100644
--- a/examples/widgets/tools/settingseditor/settingstree.h
+++ b/examples/widgets/tools/settingseditor/settingstree.h
@@ -65,10 +65,9 @@ class SettingsTree : public QTreeWidget
     Q_OBJECT
 
 public:
-    typedef QSharedPointer<QSettings> SettingsPtr;
+    using SettingsPtr = QSharedPointer<QSettings>;
 
-    SettingsTree(QWidget *parent = 0);
-    ~SettingsTree();
+    SettingsTree(QWidget *parent = nullptr);
 
     void setSettingsObject(const SettingsPtr &settings);
     QSize sizeHint() const override;
@@ -89,16 +88,16 @@ private:
     void updateChildItems(QTreeWidgetItem *parent);
     QTreeWidgetItem *createItem(const QString &text, QTreeWidgetItem *parent,
                                 int index);
-    QTreeWidgetItem *childAt(QTreeWidgetItem *parent, int index);
-    int childCount(QTreeWidgetItem *parent);
-    int findChild(QTreeWidgetItem *parent, const QString &text, int startIndex);
+    QTreeWidgetItem *childAt(QTreeWidgetItem *parent, int index) const;
+    int childCount(QTreeWidgetItem *parent) const;
+    int findChild(QTreeWidgetItem *parent, const QString &text, int startIndex) const;
     void moveItemForward(QTreeWidgetItem *parent, int oldIndex, int newIndex);
 
     SettingsPtr settings;
     QTimer refreshTimer;
-    bool autoRefresh;
     QIcon groupIcon;
     QIcon keyIcon;
+    bool autoRefresh = false;
 };
 
 #endif