PyQt - Basic Widgets

Here is the list of Widgets which we will discuss one by one in this chapter.

Sr.No Widgets & Description
1 QLabel

A QLabel object acts as a placeholder to display non-editable text or image, or a movie of animated GIF. It can also be used as a mnemonic key for other widgets.

2 QLineEdit

QLineEdit object is the most commonly used input field. It provides a box in which one line of text can be entered. In order to enter multi-line text, QTextEdit object is required.

3 QPushButton

In PyQt API, the QPushButton class object presents a button which when clicked can be programmed to invoke a certain function.

4 QRadioButton

A QRadioButton class object presents a selectable button with a text label. The user can select one of many options presented on the form. This class is derived from QAbstractButton class.

5 QCheckBox

A rectangular box before the text label appears when a QCheckBox object is added to the parent window. Just as QRadioButton, it is also a selectable button.

6 QComboBox

A QComboBox object presents a dropdown list of items to select from. It takes minimum screen space on the form required to display only the currently selected item.

7 QSpinBox

A QSpinBox object presents the user with a textbox which displays an integer with up/down button on its right.

8 QSlider Widget & Signal

QSlider class object presents the user with a groove over which a handle can be moved. It is a classic widget to control a bounded value.

9 QMenuBar, QMenu & QAction

A horizontal QMenuBar just below the title bar of a QMainWindow object is reserved for displaying QMenu objects.

10 QToolBar

A QToolBar widget is a movable panel consisting of text buttons, buttons with icons or other widgets.

11 QInputDialog

This is a preconfigured dialog with a text field and two buttons, OK and Cancel. The parent window collects the input in the text box after the user clicks on Ok button or presses Enter.

12 QFontDialog

Another commonly used dialog, a font selector widget is the visual appearance of QDialog class. Result of this dialog is a Qfont object, which can be consumed by the parent window.

13 QFileDialog

This widget is a file selector dialog. It enables the user to navigate through the file system and select a file to open or save. The dialog is invoked either through static functions or by calling exec_() function on the dialog object.

14 QTab

If a form has too many fields to be displayed simultaneously, they can be arranged in different pages placed under each tab of a Tabbed Widget. The QTabWidget provides a tab bar and a page area.

15 QStacked

Functioning of QStackedWidget is similar to QTabWidget. It also helps in the efficient use of window’s client area.

16 QSplitter

If a form has too many fields to be displayed simultaneously, they can be arranged in different pages placed under each tab of a Tabbed Widget. The QTabWidget provides a tab bar and a page area.

17 QDock

A dockable window is a subwindow that can remain in floating state or can be attached to the main window at a specified position. Main window object of QMainWindow class has an area reserved for dockable windows.

18 QStatusBar

QMainWindow object reserves a horizontal bar at the bottom as the status bar. It is used to display either permanent or contextual status information.

19 QList

QListWidget class is an item-based interface to add or remove items from a list. Each item in the list is a QListWidgetItem object. ListWidget can be set to be multiselectable.

20 QScrollBar

A scrollbar control enables the user to access parts of the document that is outside the viewable area. It provides visual indicator to the current position.

21 QCalendar

QCalendar widget is a useful date picker control. It provides a month-based view. The user can select the date by the use of the mouse or the keyboard, the default being today’s date.