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Using QtDesigner to create scripted module GUI

Scripted modules can display graphical user interface created in QtDesigner. The easiest way to create such scripted module is to use scripteddesigner template in Extension Wizard.

The scripted module base class provides two convenience features:

  • Adds an "Edit UI" button to the Reload&test section of the scripted module. Pressing the button launches QtDesigner (bundled with Slicer) and opens the module's ui file.
  • Makes all widgets available in the module widget object's ui member, so there is no need to call findChild method manually. For example, a button can be accessed simple as self.ui.ClearButton instead of finding it by calling clear_button = line_edit_widget.findChild(qt.QPushButton, 'ClearButton').

Creating widgets from .ui files manually

This section explains how UI file created using QtDesigner can be loaded and used from a python script loaded using the Slicer python interactor.

As depicted below, let's assume you created a UI file where a QLineEdit and QPushButton are layout horizontally.

Example of UI file with a QPushButton and QLineEdit

The following code snippet aims at loading the UI file and connecting the associated QPushButton and QLineEdit.

line_edit_widget = slicer.util.loadUI("/home/jchris/Projects/sandbox/qSlicerLineEditWidget.ui")

# Get references to both the QPushButton and the QLineEdit

line_edit = line_edit_widget.findChild(qt.QLineEdit, 'LineEdit')

clear_button.connect('clicked()', line_edit, 'clear()') 

Loading the UI file and accessing the associated objects is internally done using QUILoader.