Doc/QtWidgets: replace some 0 with \nullptr

Replace some 'is 0' or 'are 0' where 0 referes to a nullptr with 'is
\nullptr' and 'are \nullptr'

Change-Id: I5ff46185b570bdfc7d20d18a47fd9174771ad8e5
Reviewed-by: André Hartmann <aha_1980@gmx.de>
Reviewed-by: Sze Howe Koh <szehowe.koh@gmail.com>

src/widgets/dialogs/qwizard.cpp

@@ -2924,7 +2924,7 @@ void QWizard::setDefaultProperty(const char *className, const char *property,
     or when the watermark is not provided the side widget is displayed
     on the left side of the wizard.
 
-    Passing 0 shows no side widget.
+    Passing \nullptr shows no side widget.
 
     When the \a widget is not \nullptr the wizard reparents it.
 

src/widgets/graphicsview/qgraphicsproxywidget.cpp

@@ -570,8 +570,8 @@ QGraphicsProxyWidget::~QGraphicsProxyWidget()
     After this function returns, QGraphicsProxyWidget will keep its state
     synchronized with that of \a widget whenever possible.
 
-    If a widget is already embedded by this proxy when this function is
-    called, that widget will first be automatically unembedded. Passing 0 for
+    If a widget is already embedded by this proxy when this function is called,
+    that widget will first be automatically unembedded. Passing \nullptr for
     the \a widget argument will only unembed the widget, and the ownership of
     the currently embedded widget will be passed on to the caller.
     Every child widget that are embedded will also be embedded and their proxy

src/widgets/graphicsview/qgraphicsview.cpp

@@ -963,7 +963,7 @@ static inline void QRect_unite(QRect *rect, const QRect &other)
 /*
    Calling this function results in update rects being clipped to the item's
    bounding rect. Note that updates prior to this function call is not clipped.
-   The clip is removed by passing 0.
+   The clip is removed by passing \nullptr.
 */
 void QGraphicsViewPrivate::setUpdateClip(QGraphicsItem *item)
 {

src/widgets/styles/qdrawutil.cpp

@@ -214,7 +214,7 @@ void qDrawShadeLine(QPainter *p, int x1, int y1, int x2, int y2,
     specifies the line width for each of the lines; it is not the
     total line width.  The \a midLineWidth specifies the width of a
     middle line drawn in the QPalette::mid() color.  The rectangle's
-    interior is filled with the \a fill brush unless \a fill is 0.
+    interior is filled with the \a fill brush unless \a fill is \nullptr.
 
     The rectangle appears sunken if \a sunken is true, otherwise
     raised.
@@ -331,7 +331,7 @@ void qDrawShadeRect(QPainter *p, int x, int y, int w, int h,
     The given \a palette specifies the shading colors (\l
     {QPalette::light()}{light}, \l {QPalette::dark()}{dark} and \l
     {QPalette::mid()}{middle} colors).  The panel's interior is filled
-    with the \a fill brush unless \a fill is 0.
+    with the \a fill brush unless \a fill is \nullptr.
 
     The panel appears sunken if \a sunken is true, otherwise raised.
 
@@ -490,7 +490,7 @@ static void qDrawWinShades(QPainter *p,
     Draws the Windows-style button specified by the given point (\a x,
     \a y}, \a width and \a height using the provided \a painter with a
     line width of 2 pixels. The button's interior is filled with the
-    \a{fill} brush unless \a fill is 0.
+    \a{fill} brush unless \a fill is \nullptr.
 
     The given \a palette specifies the shading colors (\l
     {QPalette::light()}{light}, \l {QPalette::dark()}{dark} and \l
@@ -528,7 +528,7 @@ void qDrawWinButton(QPainter *p, int x, int y, int w, int h,
     Draws the Windows-style panel specified by the given point(\a x,
     \a y), \a width and \a height using the provided \a painter with a
     line width of 2 pixels. The button's interior is filled with the
-    \a fill brush unless \a fill is 0.
+    \a fill brush unless \a fill is \nullptr.
 
     The given \a palette specifies the shading colors.  The panel
     appears sunken if \a sunken is true, otherwise raised.
@@ -567,7 +567,7 @@ void qDrawWinPanel(QPainter *p, int x, int y, int w, int h,
     Draws the plain rectangle beginning at (\a x, \a y) with the given
     \a width and \a height, using the specified \a painter, \a lineColor
     and \a lineWidth. The rectangle's interior is filled with the \a
-    fill brush unless \a fill is 0.
+    fill brush unless \a fill is \nullptr.
 
     \warning This function does not look at QWidget::style() or
     QApplication::style(). Use the drawing functions in QStyle to make
@@ -676,7 +676,7 @@ void qDrawShadeLine(QPainter *p, const QPoint &p1, const QPoint &p2,
     specifies the line width for each of the lines; it is not the
     total line width.  The \a midLineWidth specifies the width of a
     middle line drawn in the QPalette::mid() color.  The rectangle's
-    interior is filled with the \a fill brush unless \a fill is 0.
+    interior is filled with the \a fill brush unless \a fill is \nullptr.
 
     The rectangle appears sunken if \a sunken is true, otherwise
     raised.
@@ -714,7 +714,7 @@ void qDrawShadeRect(QPainter *p, const QRect &r,
     The given \a palette specifies the shading colors (\l
     {QPalette::light()}{light}, \l {QPalette::dark()}{dark} and \l
     {QPalette::mid()}{middle} colors).  The panel's interior is filled
-    with the \a fill brush unless \a fill is 0.
+    with the \a fill brush unless \a fill is \nullptr.
 
     The panel appears sunken if \a sunken is true, otherwise raised.
 
@@ -746,7 +746,7 @@ void qDrawShadePanel(QPainter *p, const QRect &r,
 
     Draws the Windows-style button at the rectangle specified by \a rect using
     the given \a painter with a line width of 2 pixels. The button's interior
-    is filled with the \a{fill} brush unless \a fill is 0.
+    is filled with the \a{fill} brush unless \a fill is \nullptr.
 
     The given \a palette specifies the shading colors (\l
     {QPalette::light()}{light}, \l {QPalette::dark()}{dark} and \l
@@ -774,7 +774,7 @@ void qDrawWinButton(QPainter *p, const QRect &r,
 
     Draws the Windows-style panel at the rectangle specified by \a rect using
     the given \a painter with a line width of 2 pixels. The button's interior
-    is filled with the \a fill brush unless \a fill is 0.
+    is filled with the \a fill brush unless \a fill is \nullptr.
 
     The given \a palette specifies the shading colors.  The panel
     appears sunken if \a sunken is true, otherwise raised.
@@ -804,7 +804,7 @@ void qDrawWinPanel(QPainter *p, const QRect &r,
 
     Draws the plain rectangle specified by \a rect using the given \a painter,
     \a lineColor and \a lineWidth. The rectangle's interior is filled with the
-    \a fill brush unless \a fill is 0.
+    \a fill brush unless \a fill is \nullptr.
 
     \warning This function does not look at QWidget::style() or
     QApplication::style(). Use the drawing functions in QStyle to make

src/widgets/styles/qproxystyle.cpp

@@ -403,7 +403,7 @@ QIcon QProxyStyle::standardIcon(StandardPixmap standardIcon,
   orientation specifies whether the controls are laid out side by side
   or stacked vertically. The \a option parameter can be used to pass
   extra information about the parent widget.  The \a widget parameter
-  is optional and can also be used if \a option is 0.
+  is optional and can also be used if \a option is \nullptr.
 
   The default implementation returns -1.
 

src/widgets/styles/qstyle.cpp

@@ -2362,14 +2362,14 @@ QPalette QStyle::standardPalette() const
 
     \fn int QStyle::layoutSpacing(QSizePolicy::ControlType control1,
                                   QSizePolicy::ControlType control2, Qt::Orientation orientation,
-                                  const QStyleOption *option = 0, const QWidget *widget = 0) const
+                                  const QStyleOption *option = nullptr, const QWidget *widget = nullptr) const
 
     Returns the spacing that should be used between \a control1 and
     \a control2 in a layout. \a orientation specifies whether the
     controls are laid out side by side or stacked vertically. The \a
     option parameter can be used to pass extra information about the
     parent widget. The \a widget parameter is optional and can also
-    be used if \a option is 0.
+    be used if \a option is \nullptr.
 
     This function is called by the layout system. It is used only if
     PM_LayoutHorizontalSpacing or PM_LayoutVerticalSpacing returns a
@@ -2386,7 +2386,7 @@ QPalette QStyle::standardPalette() const
     controls are laid out side by side or stacked vertically. The \a
     option parameter can be used to pass extra information about the
     parent widget. The \a widget parameter is optional and can also
-    be used if \a option is 0.
+    be used if \a option is \nullptr.
 
     \a controls1 and \a controls2 are OR-combination of zero or more
     \l{QSizePolicy::ControlTypes}{control types}.

src/widgets/util/qundoview.cpp

@@ -358,8 +358,8 @@ QUndoStack *QUndoView::stack() const
 }
 
 /*!
-    Sets the stack displayed by this view to \a stack. If \a stack is 0, the view
-    will be empty.
+    Sets the stack displayed by this view to \a stack. If \a stack is \nullptr,
+    the view will be empty.
 
     If the view was previously looking at a QUndoGroup, the group is set to \nullptr.
 
@@ -378,10 +378,10 @@ void QUndoView::setStack(QUndoStack *stack)
 #if QT_CONFIG(undogroup)
 
 /*!
-    Sets the group displayed by this view to \a group. If \a group is 0, the view will
-    be empty.
+    Sets the group displayed by this view to \a group. If \a group is \nullptr,
+    the view will be empty.
 
-    The view will update itself autmiatically whenever the active stack of the group changes.
+    The view will update itself automatically whenever the active stack of the group changes.
 
     \sa group(), setStack()
 */

src/widgets/widgets/qabstractscrollarea.cpp

@@ -512,8 +512,8 @@ QAbstractScrollArea::~QAbstractScrollArea()
   Sets the viewport to be the given \a widget.
   The QAbstractScrollArea will take ownership of the given \a widget.
 
-  If \a widget is 0, QAbstractScrollArea will assign a new QWidget instance
-  for the viewport.
+  If \a widget is \nullptr, QAbstractScrollArea will assign a new QWidget
+  instance for the viewport.
 
   \sa viewport()
 */
@@ -720,7 +720,7 @@ QWidget *QAbstractScrollArea::cornerWidget() const
     You will probably also want to set at least one of the scroll bar
     modes to \c AlwaysOn.
 
-    Passing 0 shows no widget in the corner.
+    Passing \nullptr shows no widget in the corner.
 
     Any previous corner widget is hidden.
 

src/widgets/widgets/qcombobox.cpp

@@ -2044,7 +2044,7 @@ const QValidator *QComboBox::validator() const
     \since 4.2
 
     Sets the \a completer to use instead of the current completer.
-    If \a completer is 0, auto completion is disabled.
+    If \a completer is \nullptr, auto completion is disabled.
 
     By default, for an editable combo box, a QCompleter that
     performs case insensitive inline completion is automatically created.

src/widgets/widgets/qdialogbuttonbox.cpp

@@ -699,7 +699,7 @@ QList<QAbstractButton *> QDialogButtonBox::buttons() const
 
 /*!
     Returns the button role for the specified \a button. This function returns
-    \l InvalidRole if \a button is 0 or has not been added to the button box.
+    \l InvalidRole if \a button is \nullptr or has not been added to the button box.
 
     \sa buttons(), addButton()
 */

src/widgets/widgets/qdockwidget.cpp

@@ -1674,8 +1674,8 @@ QAction * QDockWidget::toggleViewAction() const
     \since 4.3
 
     Sets an arbitrary \a widget as the dock widget's title bar. If \a widget
-    is 0, any custom title bar widget previously set on the dock widget is
-    removed, but not deleted, and the default title bar will be used
+    is \nullptr, any custom title bar widget previously set on the dock widget
+    is removed, but not deleted, and the default title bar will be used
     instead.
 
     If a title bar widget is set, QDockWidget will not use native window

src/widgets/widgets/qmdiarea.cpp

@@ -103,8 +103,8 @@
     \fn void QMdiArea::subWindowActivated(QMdiSubWindow *window)
 
     QMdiArea emits this signal after \a window has been activated. When \a
-    window is 0, QMdiArea has just deactivated its last active window, and
-    there are no active windows on the workspace.
+    window is \nullptr, QMdiArea has just deactivated its last active window,
+    and there are no active windows on the workspace.
 
     \sa QMdiArea::activeSubWindow()
 */

src/widgets/widgets/qtabwidget.cpp

@@ -612,7 +612,7 @@ void QTabWidget::setTabVisible(int index, bool visible)
 
   Only the horizontal element of the \a corner will be used.
 
-  Passing 0 shows no widget in the corner.
+  Passing \nullptr shows no widget in the corner.
 
   Any previously set corner widget is hidden.