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, 3 insertions, 3 deletions

diff --git a/examples/widgets/tools/undoframework/commands.h b/examples/widgets/tools/undoframework/commands.h
index dc53c14557..185d36d668 100644
--- a/examples/widgets/tools/undoframework/commands.h
+++ b/examples/widgets/tools/undoframework/commands.h
@@ -62,7 +62,7 @@ public:
     enum { Id = 1234 };
 
     MoveCommand(DiagramItem *diagramItem, const QPointF &oldPos,
-                QUndoCommand *parent = 0);
+                QUndoCommand *parent = nullptr);
 
     void undo() override;
     void redo() override;
@@ -80,7 +80,7 @@ private:
 class DeleteCommand : public QUndoCommand
 {
 public:
-    explicit DeleteCommand(QGraphicsScene *graphicsScene, QUndoCommand *parent = 0);
+    explicit DeleteCommand(QGraphicsScene *graphicsScene, QUndoCommand *parent = nullptr);
 
     void undo() override;
     void redo() override;
@@ -96,7 +96,7 @@ class AddCommand : public QUndoCommand
 {
 public:
     AddCommand(DiagramItem::DiagramType addType, QGraphicsScene *graphicsScene,
-               QUndoCommand *parent = 0);
+               QUndoCommand *parent = nullptr);
     ~AddCommand();
 
     void undo() override;