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Widgets at a glance

Widgets are the basic building blocks of a Graphical User Interface hierarchy in GUI applications. Widgets are basically used to display data and status information, receive user input, and provide a container for other widgets that should be grouped together. Qt comes with a variety of basic and advanced built-in widgets that can be customized to our own needs. A list of predefined widgets is given in the following tables for your reference. QWidget is the base class for all the widgets given in the following lists.

The following is a list of predefined basic widgets:

Widget	Description
`QCheckBox`	This is a checkbox with a text label
`QComboBox`	This is a combined button and pop-up list
`QCommandLinkButton`	This is a Vista-style command-link button
`QDateEdit`	This is a widget that is used to edit dates that are based on the `QDateTimeEdit` widget
`QDateTimeEdit`	This is a widget that is used to edit dates and times
`QDial`	This is a rounded range control (such as a speedometer or potentiometer)
`QDoubleSpinBox`	This is a spin box widget that takes doubles
`QFocusFrame`	This is a focus frame, which can be outside of a widget's normal paintable area
`QFontComboBox`	This is a combobox that lets the user select a font family
`QLCDNumber`	This displays a number with LCD-like digits
`QLabel`	This is text or image display
`QLineEdit`	This is a one-line text editor
`QMenu`	This is the menu widget for use in menu bars, context menus, and other popup menus
`QProgressBar`	This is a horizontal or vertical progress bar
`QPushButton`	This is a command button
`QRadioButton`	This is a radio button with a text label
`QScrollArea`	This allows scrolling view onto another widget
`QScrollBar`	This is a vertical or horizontal scroll bar
`QSizeGrip`	This is a resize handle to resize top-level windows
`QSlider`	This is a vertical or horizontal slider
`QSpinBox`	This is a spin box widget
`QTabBar`	This is a tab bar, for example, for use in tabbed dialogs
`QTabWidget`	This is a stack of tabbed widgets
`QTimeEdit`	This is a widget that is used to edit times that are based on the `QDateTimeEdit` widget
`QToolBox`	This is a column of tabbed widget items
`QToolButton`	This is a quick-access button to commands or options that are usually used inside a `QToolBar`
`QWidget`	This is the base class of all user interface objects

The following is a list of predefined advanced widgets:

Widget	Description
`QCalendarWidget`	This is a monthly-based calendar widget allowing the user to select a date
`QColumnView`	This is a model/view implementation of a column view
`QDataWidgetMapper`	This is a mapping between a section of a data model to widgets
`QDesktopWidget`	This allows access to screen information on multihead systems
`QListView`	This allows list or icon view onto a model
`QMacCocoaViewContainer`	This is a widget for Mac OS X that can be used to wrap arbitrary Cocoa views (that is, NSView subclasses) and insert them into Qt hierarchies
`QMacNativeWidget`	This is a widget for Mac OS X that provides a way to put Qt widgets into Carbon or Cocoa hierarchies depending on how Qt was configured
`QTableView`	This is the default model/view implementation of a table view
`QTreeView`	This is the default model/view implementation of a tree view
`QUndoView`	This displays the contents of a `QUndoStack`
`QWSEmbedWidget`	This enables embedded top-level widgets in Qt for Embedded Linux
`QWebView`	This is a widget that is used to view and edit web documents
`QX11EmbedContainer`	This is the `XEmbed` container widget
`QX11EmbedWidget`	This is the `XEmbed` client widget
`Phonon::VideoWidget`	This is a widget that is used to display video

The following is a list of predefined organizer widgets:

Widget	Description
`QButtonGroup`	This is a container that is used to organize groups of button widgets
`QGroupBox`	This is a group box frame with a title
`QSplitter`	This implements a splitter widget
`QSplitterHandle`	This will handle functionality of the splitter
`QStackedWidget`	This is a stack of widgets where only one widget is visible at a time
`QTabWidget`	This is a stack of tabbed widgets

We saw the implementation of a few of these built-in widgets in our previous chapters. One of the greatest strengths of PySide lies in the ease of creation of customized widgets. We can group some of the basic widgets together to create a customized widget on our own. Before we can do this, we also have several ways to customize a widget to suit our needs. The basic form of customization is to change the properties of the existing widget. We can also opt to use style sheets to customize the widget's appearance and some aspects of its behavior. In some cases, it is highly likely that we may require a widget that is different from any of the standard widgets. In these cases, we can subclass QWidget directly and can completely define the behavior and appearance of the widget ourselves. In the next example, we create a customized Analog Clock widget and demonstrate how to create custom widgets.

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Widgets at a glance

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Widgets at a glance