HowTo: Use the Wheel Control

This documentation is valid for:
GeneXus 18 Help
GeneXus 17 Help

Sometimes you need to navigate through the values a field can adopt. The wheel control has gained popularity with the touch screen interface and is very used in this cases. You can scroll through an enumarated domain or numeric values to select the value you want.

In this article it is explained the most important concepts of the wheel control and there is an example on how to use it.

For our example we will use the following transaction with Work With pattern and Work With object (WWSD) applied (for further information see Applying Work With Pattern).

This control applies to the following data types:

We are going to focus on the last two.

On our transaction there is an enumerated and a numeric based attribute.

Enumerated Domain:

To enable the control go to the Section (under Detail node) selecting the Edit layout. Select the numeric attribute and change the Control Type property to SD Wheel.

This will enable some other properties.

General SD Wheel properties

Notify Context Change	This property is used for event handling.
Display Style	"Inline" or "As a picker" values. You can select how this control is seen. The default value is "As a picker". This property has effect only in iOS devices. For Android devices the wheel control is always displayed as a picker. This restriction is imposed by the plaform itself.
Cyclic	You can enable this property if you want the last value to be continued by the first one.

For Numeric based attributes:

Step	The incrementation from one value to another.
Min Value	The minimum value the control will show to select.
Max Value	The maximum value the control will enable you to select.