Doc: Add example categories to Qt Widget examples

Added example categories and fixed some minor typos as well.

Task-number: QTBUG-116359
Change-Id: I2e270a1919003f4cea233666b64437e4c2b77121
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit 7ef93cbf6883af053b1bdf042975b11a39f0312b)
Reviewed-by: Kai Köhne <kai.koehne@qt.io>

examples/widgets/desktop/systray/doc/src/systray.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example desktop/systray
     \title System Tray Icon Example
+    \examplecategory {Desktop}
     \ingroup examples-widgets
     \brief The System Tray Icon example shows how to add an icon with a menu
     and popup messages to a desktop environment's system tray.

examples/widgets/doc/dropsite.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example draganddrop/dropsite
     \title Drop Site Example
+    \examplecategory {User Interface Components}
 
     \brief The example shows how to distinguish the various MIME formats available
     in a drag and drop operation.

examples/widgets/doc/src/addressbook.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example itemviews/addressbook
     \title Address Book
+    \examplecategory {User Interface Components}
     \ingroup examples-itemviews
     \brief The address book example shows how to use proxy models to display
     different views onto data from a single model.

examples/widgets/doc/src/affine.qdoc

@@ -4,8 +4,9 @@
 /*!
     \example painting/affine
     \title Affine Transformations
+    \examplecategory {Graphics & Multimedia}
     \ingroup examples-painting
-    \brief Demonstrates how affine transformations in QPainter works.
+    \brief Demonstrates how affine transformations in QPainter work.
 
     \brief In this example we show Qt's ability to perform affine transformations
     on painting operations.

examples/widgets/doc/src/basicdrawing.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example painting/basicdrawing
     \title Basic Drawing Example
+    \examplecategory {Graphics & Multimedia}
     \ingroup examples-painting
     \brief The Basic Drawing example shows how to display basic
     graphics primitives in a variety of styles using the QPainter

examples/widgets/doc/src/basicgraphicslayouts.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example graphicsview/basicgraphicslayouts
     \title Basic Graphics Layouts Example
+    \examplecategory {Graphics & Multimedia}
     \ingroup examples-graphicsview-layout
     \brief Demonstrates how to create basic graphics layout.
 

examples/widgets/doc/src/basiclayouts.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example layouts/basiclayouts
     \title Basic Layouts Example
+    \examplecategory {User Interface Components}
     \brief Shows how to use the standard layout managers.
 
     \e{Basic Layouts} shows how to use the standard layout managers that are

examples/widgets/doc/src/basicsortfiltermodel.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example itemviews/basicsortfiltermodel
     \title Basic Sort/Filter Model Example
+    \examplecategory {User Interface Components}
     \ingroup examples-itemviews
     \brief The Basic Sort/Filter Model example illustrates how to use
     QSortFilterProxyModel to perform basic sorting and filtering.

examples/widgets/doc/src/calculator.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example widgets/calculator
     \title Calculator Example
+    \examplecategory {User Interface Components}
     \ingroup examples-widgets
     \ingroup examples-layout
     \brief The example shows how to use signals and slots to implement the

examples/widgets/doc/src/calendarwidget.qdoc

@@ -3,6 +3,7 @@
 
 /*!
     \title Calendar Widget Example
+    \examplecategory {Graphics & Multimedia}
     \example widgets/calendarwidget
     \ingroup examples-widgets
     \ingroup examples-layout

examples/widgets/doc/src/chip.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example graphicsview/chip
     \title 40000 Chips
+    \examplecategory {Graphics & Multimedia}
     \ingroup examples-graphicsview
     \brief Visualizes a huge graphic view scene with 40000 chip items.
 

examples/widgets/doc/src/collidingmice-example.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example graphicsview/collidingmice
     \title Colliding Mice Example
+    \examplecategory {Graphics & Multimedia}
     \brief Demonstrates how to animate items on a graphics view.
     \ingroup examples-graphicsview
 

examples/widgets/doc/src/coloreditorfactory.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example itemviews/coloreditorfactory
     \title Color Editor Factory Example
+    \examplecategory {User Interface Components}
     \ingroup examples-itemviews
     \brief This example shows how to create an editor that can be used by
     a QItemDelegate.

examples/widgets/doc/src/combowidgetmapper.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example itemviews/combowidgetmapper
     \title Combo Widget Mapper Example
+    \examplecategory {User Interface Components}
     \ingroup examples-itemviews
     \brief The Combo Widget Mapper example shows how to use a custom delegate to
     map information from a model to specific widgets on a form.

examples/widgets/doc/src/completer.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example tools/completer
     \title Completer Example
+    \examplecategory {User Interface Components}
     \ingroup examples-widgets-tools
 
     \brief The Completer example shows how to provide string-completion facilities
@@ -45,7 +46,7 @@
     \snippet tools/completer/fsmodel.cpp 0
 
     As mentioned earlier, the \c data() function is reimplemented in order to
-    get it to return the entire file parth for the display role. For example,
+    get it to return the entire file path for the display role. For example,
     with a QFileSystemModel, you will see "Program Files" in the view. However, with
     \c FileSystemModel, you will see "C:\\Program Files".
 
@@ -201,7 +202,7 @@
 
     \snippet tools/completer/mainwindow.cpp 14
 
-    The \c changeMaxVisible() update the maximum number of visible items in
+    The \c changeMaxVisible() updates the maximum number of visible items in
     the completer.
 
     \snippet tools/completer/mainwindow.cpp 15

examples/widgets/doc/src/composition.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example painting/composition
     \title Composition Modes
+    \examplecategory {Graphics & Multimedia}
     \ingroup examples-painting
     \brief Demonstrates how Composition Modes work in QPainter.
 

examples/widgets/doc/src/concentriccircles.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example painting/concentriccircles
     \title Concentric Circles Example
+    \examplecategory {Graphics & Multimedia}
     \ingroup examples-painting
     \brief Demonstrates the improved quality that antialiasing and floating point precision gives.
 
@@ -13,7 +14,7 @@
     how to do simple animations.
 
     The application's main window displays several widgets which are
-    drawn using the various combinations of precision and
+    drawn using various combinations of precision and
     anti-aliasing.
 
     \image concentriccircles-example.png

examples/widgets/doc/src/customsortfiltermodel.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example itemviews/customsortfiltermodel
     \title Custom Sort/Filter Model Example
+    \examplecategory {User Interface Components}
     \ingroup examples-itemviews
     \brief The Custom Sort/Filter Model example illustrates how to subclass
     QSortFilterProxyModel to perform advanced sorting and filtering.

examples/widgets/doc/src/deform.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example painting/deform
     \title Vector Deformation
+    \examplecategory {Graphics & Multimedia}
     \ingroup examples-painting
     \brief Demonstrates how to manipulate the elements of a QPainterPath.
 

examples/widgets/doc/src/diagramscene.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example graphicsview/diagramscene
     \title Diagram Scene Example
+    \examplecategory {Graphics & Multimedia}
     \ingroup examples-graphicsview
     \brief Demonstrate how to use the Graphics View framework.
 

examples/widgets/doc/src/dragdroprobot.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example graphicsview/dragdroprobot
     \title Drag and Drop Robot Example
+    \examplecategory {Graphics & Multimedia}
     \ingroup examples-graphicsview
     \brief Demonstrates how to drag and drop items in a graphics view.
 

examples/widgets/doc/src/draggableicons.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example draganddrop/draggableicons
     \title Draggable Icons Example
+    \examplecategory {User Interface Components}
 
     \brief The Draggable Icons example shows how to drag and drop image data between widgets
     in the same application, and between different applications.

examples/widgets/doc/src/draggabletext.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example draganddrop/draggabletext
     \title Draggable Text Example
+    \examplecategory {User Interface Components}
     \brief Illustrates how to drag and drop text between widgets.
 
     \brief The Draggable Text example shows how to drag and drop textual data between widgets

examples/widgets/doc/src/easing.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example animation/easing
     \title Easing Curves Example
+    \examplecategory {Graphics & Multimedia}
 
     \brief The Easing Curves example shows how to use easing curves to
     control the speed of an animation.

examples/widgets/doc/src/echoplugin.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example tools/echoplugin
     \title Echo Plugin Example
+    \examplecategory {Data Processing & I/O}
     \ingroup examples-widgets-tools
     \ingroup examples-layout
 

examples/widgets/doc/src/editabletreemodel.qdoc

@@ -4,9 +4,10 @@
 /*!
     \example itemviews/editabletreemodel
     \title Editable Tree Model Example
+    \examplecategory {User Interface Components}
     \ingroup examples-itemviews
     \brief This example shows how to implement a simple item-based tree model that can
-    be used with other classes the model/view framework.
+    be used with other classes in the model/view framework.
 
     \image itemviews-editabletreemodel.png
 

examples/widgets/doc/src/elasticnodes.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example graphicsview/elasticnodes
     \title Elastic Nodes Example
+    \examplecategory {Graphics & Multimedia}
     \ingroup examples-graphicsview
     \brief Demonstrates how to interact with graphical items in a scene.
 

examples/widgets/doc/src/fetchmore.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example itemviews/fetchmore
     \title Fetch More Example
+    \examplecategory {User Interface Components}
     \ingroup examples-itemviews
     \brief The Fetch More example shows how to add items to an item view
     model on demand.

examples/widgets/doc/src/flowlayout.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example layouts/flowlayout
     \title Flow Layout Example
+    \examplecategory {User Interface Components}
     \ingroup examples-layout
     \brief Shows how to arrange widgets for different window sizes.
 

examples/widgets/doc/src/frozencolumn.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example itemviews/frozencolumn
     \title Frozen Column Example
+    \examplecategory {User Interface Components}
     \ingroup examples-itemviews
     \brief This example demonstrates how to freeze a column within a QTableView.
 

examples/widgets/doc/src/gallery.qdoc

@@ -5,6 +5,7 @@
     \example gallery
     \meta {tag} {gallery}
     \title Widgets Gallery Example
+    \examplecategory {User Interface Components}
     \ingroup examples-widgets
     \brief The Widgets Gallery example shows widgets relevant for designing UIs.
 

examples/widgets/doc/src/gradients.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example painting/gradients
     \title Gradients
+    \examplecategory {Graphics & Multimedia}
     \ingroup examples-painting
     \brief Shows how gradients can be used with QPainter.
 

examples/widgets/doc/src/graphicsview-simpleanchorlayout.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example graphicsview/simpleanchorlayout
     \title Simple Anchor Layout Example
+    \examplecategory {Graphics & Multimedia}
     \ingroup examples-graphicsview-layout
     \brief Demonstrates anchor layout on a graphics view scene.
 

examples/widgets/doc/src/groupbox.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example widgets/groupbox
     \title Group Box Example
+    \examplecategory {User Interface Components}
     \ingroup examples-widgets
     \brief The Group Box example shows how to use the different kinds of group
     boxes in Qt.

examples/widgets/doc/src/imagecomposition.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example painting/imagecomposition
     \title Image Composition Example
+    \examplecategory {Graphics & Multimedia}
     \ingroup examples-painting
     \ingroup examples-layout
     \brief Shows how composition modes work in QPainter.

examples/widgets/doc/src/licensewizard.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example dialogs/licensewizard
     \title License Wizard Example
+    \examplecategory {User Interface Components}
     \ingroup examples-dialogs
 
     \brief The License Wizard example shows how to implement complex wizards in

examples/widgets/doc/src/lineedits.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example widgets/lineedits
     \title Line Edits Example
+    \examplecateogry {User Interface Components}
     \ingroup examples-widgets
     \brief The Line Edits example demonstrates the many ways that QLineEdit
     can be used, and shows the effects of various properties and validators

examples/widgets/doc/src/menus.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example mainwindows/menus
     \title Menus Example
+    \examplecategory {User Interface Components}
     \ingroup examples-mainwindow
     \ingroup examples-layout
 

examples/widgets/doc/src/orderform.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example richtext/orderform
     \title Order Form Example
+    \examplecategory {User Interface Components}
     \ingroup examples-richtext
     \brief The Order Form example shows how to generate rich text
     documents by combining a simple template with data input by the

examples/widgets/doc/src/painterpaths.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example painting/painterpaths
     \title Painter Paths Example
+    \examplecategory {Graphics & Multimedia}
     \ingroup examples-painting
     \brief The Painter Paths example shows how painter paths can be
     used to beuild complex shapes for rendering.

examples/widgets/doc/src/pathstroke.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example painting/pathstroke
     \title Path Stroking
+    \examplecategory {Graphics & Multimedia}
     \ingroup examples-painting
     \brief The Path Stroking example shows various types of pens that
     can be used with QPainter.

examples/widgets/doc/src/regularexpression.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example tools/regularexpression
     \title QRegularExpression Example
+    \examplecategory {User Interface Components}
     \ingroup examples-widgets-tools
 
     \brief The QRegularExpression example shows how regular expressions in Qt are

examples/widgets/doc/src/screenshot.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example desktop/screenshot
     \title Taking a Screenshot
+    \examplecategory {Desktop}
     \ingroup examples-desktop
     \brief The Screenshot example shows how to take a screenshot of the
     desktop.

examples/widgets/doc/src/scribble.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example widgets/scribble
     \title Scribble Example
+    \examplecategory {User Interface Components}
     \ingroup examples-widgets
     \brief The Scribble example shows how to reimplement some of QWidget's
     event handlers to receive the events generated for the

examples/widgets/doc/src/settingseditor.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example tools/settingseditor
     \title Settings Editor Example
+    \examplecategory {User Interface Components}
     \ingroup examples-widgets-tools
 
     \brief The Settings Editor example shows how Qt's standard settings support is used in an

examples/widgets/doc/src/shapedclock.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example widgets/shapedclock
     \title Translucent Background
+    \examplecategory {User Interface Components}
     \ingroup examples-widgets
     \brief The example shows how to make a round window with a translucent
     background.

examples/widgets/doc/src/shortcuteditor.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example widgets/shortcuteditor
     \title Shortcut Editor Example
+    \examplecategory {User Interface Components}
     \ingroup examples-widgets
     \brief The Shortcut Editor example shows how to create a basic, read-write
     hierarchical model to use with Qt's standard view and QKeySequenceEdit

examples/widgets/doc/src/simpletreemodel.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example itemviews/simpletreemodel
     \title Simple Tree Model Example
+    \examplecategory {User Interface Components}
     \ingroup examples-itemviews
     \ingroup examples-layout
     \brief The Simple Tree Model example shows how to use a hierarchical model

examples/widgets/doc/src/sliders.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example widgets/sliders
     \title Sliders Example
+    \examplecategory {User Interface Components}
     \ingroup examples-widgets
     \brief The Sliders example shows how to use the different types of sliders
     available in Qt: QSlider, QScrollBar and QDial.

examples/widgets/doc/src/spinboxdelegate.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example itemviews/spinboxdelegate
     \title Spin Box Delegate Example
+    \examplecategory {User Interface Components}
     \ingroup examples-itemviews
     \brief The Spin Box Delegate example shows how to create an editor for a custom delegate in
     the model/view framework by reusing a standard Qt editor widget.

examples/widgets/doc/src/spinboxes.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example widgets/spinboxes
     \title Spin Boxes Example
+    \examplecategory {User Interface Components}
     \ingroup examples-widgets
     \brief The Spin Boxes example shows how to use the many different types of
     spin boxes available in Qt, from a simple QSpinBox widget to more complex

examples/widgets/doc/src/spreadsheet.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example itemviews/spreadsheet
     \title Spreadsheet
+    \examplecategory {User Interface Components}
     \ingroup examples-itemviews
     \brief The Spreadsheet example shows how to create a simple spreadsheet application.
 

examples/widgets/doc/src/standarddialogs.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example dialogs/standarddialogs
     \title Standard Dialogs Example
+    \examplecategory {User Interface Components}
     \ingroup examples-dialogs
 
     \brief The Standard Dialogs example shows the standard dialogs that are provided by Qt.

examples/widgets/doc/src/stardelegate.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example itemviews/stardelegate
     \title Star Delegate Example
+    \examplecategory {User Interface Components}
     \ingroup examples-itemviews
     \brief The Star Delegate example shows how to create a delegate that
     can paint itself and that supports editing.

examples/widgets/doc/src/styleplugin.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example tools/styleplugin
     \title Style Plugin Example
+    \examplecategory {User Interface Components}
     \ingroup examples-widgets-tools
 
     \brief This example shows how to create a plugin that extends Qt with a new

examples/widgets/doc/src/syntaxhighlighter.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example richtext/syntaxhighlighter
     \title Syntax Highlighter Example
+    \examplecategory {User Interface Components}
     \ingroup examples-richtext
     \brief The Syntax Highlighter example shows how to perform
     simple syntax highlighting.

examples/widgets/doc/src/tabdialog.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example dialogs/tabdialog
     \title Tab Dialog Example
+    \examplecategory {User Interface Components}
     \ingroup examples-dialogs
 
     \brief The Tab Dialog example shows how to construct a tab dialog using the

examples/widgets/doc/src/tablet.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example widgets/tablet
     \title Tablet Example
+    \examplecategory {User Interface Components}
     \ingroup examples-widgets
     \brief This example shows how to use a Wacom tablet in Qt applications.
 
@@ -13,7 +14,7 @@
     generated. You need to reimplement the \l{QWidget::}{tabletEvent()} event
     handler if you want to handle tablet events. Events are generated when the
     tool (stylus) used for drawing enters and leaves the proximity of the
-    tablet (i.e., when it is close but not pressed down on it), when the tool
+    tablet (i.e., when it is closed but not pressed down on it), when the tool
     is pressed down and released from it, when the tool is moved across the
     tablet, and when one of the buttons on the tool is pressed or released.
 
@@ -31,7 +32,7 @@
     draw on the tablet as you use a pencil on paper. When you draw with the
     airbrush you get a spray of virtual paint; the finger wheel is used to
     change the density of the spray. When you draw with the art pen, you get a
-    a line whose width and endpoint angle depend on the rotation of the pen.
+    line whose width and endpoint angle depend on the rotation of the pen.
     The pressure and tilt can also be assigned to change the alpha and
     saturation values of the color and the width of the stroke.
 

examples/widgets/doc/src/tooltips.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example widgets/tooltips
     \title Tool Tips Example
+    \examplecategory {User Interface Components}
     \ingroup examples-widgets
     \brief The Tool Tips example shows how to provide static and dynamic tool
     tips for an application's widgets.

examples/widgets/doc/src/transformations.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example painting/transformations
     \title Transformations Example
+    \examplecategory {Graphics & Multimedia}
     \ingroup examples-painting
     \brief The Transformations example shows how transformations
     influence the way that QPainter renders graphics primitives.

examples/widgets/doc/src/treemodelcompleter.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example tools/treemodelcompleter
     \title Tree Model Completer Example
+    \examplecategory {User Interface Components}
     \ingroup examples-widgets-tools
 
     \brief The Tree Model Completer example shows how to provide completion

examples/widgets/doc/src/trivialwizard.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example dialogs/trivialwizard
     \title Trivial Wizard Example
+    \examplecategory {User Interface Components}
     \ingroup examples-dialogs
 
     \brief The Trivial Wizard example illustrates how to create a linear three-page

examples/widgets/doc/src/undoframework.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example tools/undoframework
     \title Undo Framework Example
+    \examplecategory {Data Processing & I/O}
     \ingroup examples-widgets-tools
 
     \brief This example shows how to implement undo/redo functionality

examples/widgets/doc/src/windowflags.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example widgets/windowflags
     \title Window Flags Example
+    \examplecategory {User Interface Components}
     \ingroup examples-widgets
     \brief The Window Flags example shows how to use the window flags
     available in Qt.

examples/widgets/gestures/imagegestures/doc/src/imagegestures.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example gestures/imagegestures
     \title Image Gestures Example
+    \examplecategory {User Interface Components}
     \brief Demonstrates the use of simple gestures in a widget.
 
     This example shows how to enable gestures for a widget and use gesture input

examples/widgets/touch/knobs/doc/src/touch-knobs.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example touch/knobs
     \title Touch Knobs Example
+    \examplecategory {User Interface Components}
     \ingroup touchinputexamples
     \brief Shows how to create custom controls that accept touch input.
 

examples/widgets/tutorials/notepad/gettingstartedqt.qdoc

@@ -4,6 +4,7 @@
 /*!
     \example tutorials/notepad
     \title Getting Started Programming with Qt Widgets
+    \examplecategory {User Interface Components}
     \brief A tutorial for Qt Widgets based notepad application.
 
     In this topic, we teach basic Qt knowledge by implementing a simple

src/widgets/doc/src/widgets-tutorial.qdoc

@@ -101,6 +101,7 @@
 /*!
     \example tutorials/widgets/toplevel
     \title Widgets Tutorial - Creating a Window
+    \examplecategory {User Interface Components}
 
     If a widget is created without a parent, it is treated as a window, or
     \e{top-level widget}, when it is shown. Since it has no parent object to
@@ -127,6 +128,7 @@
 /*!
     \example tutorials/widgets/childwidget
     \title Widgets Tutorial - Child Widgets
+    \examplecategory {User Interface Components}
 
     We can add a child widget to the window created in the previous example by
     passing \c window as the parent to its constructor. In this case, we add a
@@ -149,6 +151,7 @@
 /*!
     \example tutorials/widgets/windowlayout
     \title Widgets Tutorial - Using Layouts
+    \examplecategory {User Interface Components}
 
     Usually, child widgets are arranged inside a window using layout objects
     rather than by specifying positions and sizes explicitly. Here, we
@@ -183,6 +186,7 @@
 /*!
     \example tutorials/widgets/nestedlayouts
     \title Widgets Tutorial - Nested Layouts
+    \examplecategory {User Interface Components}
 
     Just as widgets can contain other widgets, layouts can be used to provide
     different levels of grouping for widgets. Here, we want to display a