Qt Slider Support

Applies to TestComplete 15.10, last modified on December 01, 2021

About Support

TestComplete can recognize Qt Slider controls in Qt applications. It provides special properties and methods that let you retrieve the controls data and simulate user actions on the controls (see below).

Supported Versions

Supported component versions: Qt ver. 5.0 - 5.12 by Digia, Qt.

There are also special TestComplete modules that provide support for earlier versions of Qt controls. These modules cannot be used with the modules that provide support for Qt controls 5.0 - 5.12. They are not included into the TestComplete installation package. You can download them from our web site:


The package to be downloaded contains detailed information on how to install these specific modules in TestComplete.


In order for TestComplete to be able to work with Qt Slider controls, the following requirements must be met:

  • You must have an active license for the TestComplete Desktop module.

  • The control’s class name must be specified in the Qt Controls | Slider group of your project’s Object Mapping options. By default, this group contains the following item:

    • QSlider

    You can also command the test engine to recognize custom controls as Qt Slider controls. See below for information about this.

  • Support for the Qt Slider controls is implemented by the Qt Controls Support plugin. This plugin is installed and enabled automatically as part of the TestComplete Desktop module.

    If you experience issues when working with the controls, select File > Install Extensions from the TestComplete main menu and check whether the plugin is active. (You can find the plugin in the Desktop group.) If the plugin is not available, run the TestComplete installation in the Repair mode.

Recognizing Custom Controls

To command TestComplete to recognize your custom controls as Qt Slider controls:

  1. Open your project’s Object Mapping options.

  2. Add the control’s class name to the Qt Controls | Slider group.

    If you do not know the control’s name, you can ask the control’s developers, or you can view the control’s QtClassName property in the Object Browser panel. As an alternative, you can click Add From Screen and select your custom control on screen. TestComplete will retrieve the control’s class name and add it to the selected mapping group automatically. For detailed information, see Object Mapping.

Once the control is mapped, it gets all the properties, methods and actions specific to the Qt Slider control.

If the specified custom control does not fit the control’s type, then it may not properly respond to commands that TestComplete sends, so recording or playing back user actions over the tested control will cause errors.


When testing Qt Slider controls, you can use properties and methods specific to these controls, as well as properties and methods that TestComplete applies to onscreen objects. For the full list of available properties and methods, see the following topics:

See Also

Support for Qt Applications' Controls

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