User`s guide

Share Data Among a GUI’s Callbacks

In this section...

“Share Data with Nested Functions” on page 13-11

“Share Data with UserData” on page 13-15

“Share Data with Application Data” on page 13-18

“Share Data with GUI Data” on page 13-21

The following four sections each contain complete code for example G UIs

that you can copy to code files and run. For general information about these

methods, see “Ways to Manage Data in a Programmatic GUI” on page 13-2.

Share Data with Nested Functions

You can use GUI data, application data, and the UserData property to share

data among a GUI’s callbacks. In many cases, nested functions enable you to

share data among callbacks without using the other data forms.

Nested Functions Example: Passing Data Between Components

This example uses a GUI that contains a slider and an edit text component. A

static text component instructs the user to enter a value in the edit text or

click the slider. The example initializes and maintains an error counter, as

well as the old and new values of the slider, in a nested functions environment.

13-11