Make QWidget *=0, Qt::WindowFlags f=0 functions use Q_NULLPTR

This is in preparation of adding -Wzero-as-null-pointer-constant (or similar)
to the headers check.

Task-number: QTBUG-45291
Change-Id: If9721e8b1ab3b4cd6e3e366362cae314f451bbed
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>

2 files changed, 6 insertions, 4 deletions

diff --git a/src/printsupport/dialogs/qprintpreviewdialog.h b/src/printsupport/dialogs/qprintpreviewdialog.h
index 15e0271ba0..228cd24f48 100644
--- a/src/printsupport/dialogs/qprintpreviewdialog.h
+++ b/src/printsupport/dialogs/qprintpreviewdialog.h
@@ -52,8 +52,9 @@ class Q_PRINTSUPPORT_EXPORT QPrintPreviewDialog : public QDialog
     Q_DECLARE_PRIVATE(QPrintPreviewDialog)
 
 public:
-    explicit QPrintPreviewDialog(QWidget *parent = 0, Qt::WindowFlags flags = 0);
-    explicit QPrintPreviewDialog(QPrinter *printer, QWidget *parent = 0, Qt::WindowFlags flags = 0);
+    explicit QPrintPreviewDialog(QWidget *parent = Q_NULLPTR, Qt::WindowFlags flags = Qt::WindowFlags());
+    explicit QPrintPreviewDialog(QPrinter *printer, QWidget *parent = Q_NULLPTR,
+                                 Qt::WindowFlags flags = Qt::WindowFlags());
     ~QPrintPreviewDialog();
 
     using QDialog::open;
diff --git a/src/printsupport/widgets/qprintpreviewwidget.h b/src/printsupport/widgets/qprintpreviewwidget.h
index e88b421ca9..16b388d936 100644
--- a/src/printsupport/widgets/qprintpreviewwidget.h
+++ b/src/printsupport/widgets/qprintpreviewwidget.h
@@ -62,8 +62,9 @@ public:
         FitInView
     };
 
-    explicit QPrintPreviewWidget(QPrinter *printer, QWidget *parent = 0, Qt::WindowFlags flags = 0);
-    explicit QPrintPreviewWidget(QWidget *parent = 0, Qt::WindowFlags flags = 0);
+    explicit QPrintPreviewWidget(QPrinter *printer, QWidget *parent = Q_NULLPTR,
+                                 Qt::WindowFlags flags = Qt::WindowFlags());
+    explicit QPrintPreviewWidget(QWidget *parent = Q_NULLPTR, Qt::WindowFlags flags = Qt::WindowFlags());
     ~QPrintPreviewWidget();
 
     qreal zoomFactor() const;