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, 6 deletions

diff --git a/examples/widgets/tools/settingseditor/mainwindow.h b/examples/widgets/tools/settingseditor/mainwindow.h
index 373c982afe..b1115005a9 100644
--- a/examples/widgets/tools/settingseditor/mainwindow.h
+++ b/examples/widgets/tools/settingseditor/mainwindow.h
@@ -68,7 +68,7 @@ class MainWindow : public QMainWindow
 public:
     typedef QSharedPointer<QSettings> SettingsPtr;
 
-    MainWindow();
+    MainWindow(QWidget *parent = nullptr);
 
 private slots:
     void openSettings();
@@ -81,11 +81,11 @@ private:
     void createActions();
     void setSettingsObject(const SettingsPtr &settings);
 
-    SettingsTree *settingsTree;
-    LocationDialog *locationDialog;
-    QAction *refreshAct;
-    QAction *autoRefreshAct;
-    QAction *fallbacksAct;
+    SettingsTree *settingsTree = nullptr;
+    LocationDialog *locationDialog = nullptr;
+    QAction *refreshAct = nullptr;
+    QAction *autoRefreshAct = nullptr;
+    QAction *fallbacksAct = nullptr;
 };
 
 #endif