Besides colors, fonts, and userdata values, two additional widget attributes can be managed by developers: widget visibility and sensitivity.

The Show and Hide keywords to the WwSetValue function control whether a widget is visible or not. By default, all widgets are shown when they are created.

To hide a widget, use the Hide keyword:

status = WwSetValue(widget, /Hide)

To show a hidden widget, use the Show keyword:

status = WwSetValue(widget, /Show)

In these functions, the widget parameter is the widget ID of the widget you want to show or hide.

You can also test to determine if a widget is shown or hidden, using the Shown keyword in the WwGetValue function.

shown = WwGetValue(widget, /Shown)

If the widget is shown, the function returns 1; if hidden, 0 is returned.

If a widget is sensitive, some action will occur when the user selects the widget. For example, if the user clicks on a button that is sensitive, an action occurs. By default, all widgets are sensitive when they are created.

You can set a widget to nonsensitive with the Nonsensitive keyword in the WwSetValue function. When a widget is nonsensitive, its foreground color is grayed-out, and the widget cannot accept input from users.

status = WwSetValue(widget, /Nonsensitive)

To change the sensitivity of widgets, use the /Sensitive keyword:

status = WwSetValue(widget, /Sensitive)

To determine a widget’s sensitivity, use the Sensitive keyword in the WwGetValue function.

shown = WwGetValue(widget, /Sensitive)

The function returns 1 for sensitive; 0 for nonsensitive.