MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Instrukcja Użytkownika Pobierz pdf (Strona 195)

Examples: Programming GUI Components

8-23

Triggering Callback Execution

For both UNIX and Windows, clicking inside the GUI but outside the edit text

causes the edit text callback to execute. The user can also press

Enter for an

edit text that allows only a single line of text, or

Ctrl+Enter for an edit text that

allows multiple lines.

Available Keyboard Accelerators

GUI users can use the following keyboard accelerators to modify the content of

an edit text. These accelerators are not modifiable.

• Ctrl+X – Cut

• Ctrl+C – Copy

• Ctrl+V – Paste

• Ctrl+H – Delete last character

• Ctrl+A – Select all

Slider

You can determine the current value of a slider from within its callback by

querying its

Value property, as illustrated in the following example:

function slider1_Callback(hObject, eventdata, handles)

slider_value = get(hObject,'Value');

% Proceed with callback...

The Max and Min properties specify the slider’s maximum and minimum values.

The slider’s range is

Max - Min.

List Box

When the list box Callback callback is triggered, the list box Value property

contains the index of the selected item, where

1 corresponds to the first item in

the list. The

String property contains the list as a cell array of strings.

This example retrieves the selected string. It assumes

listbox1 is the value of

the

Tag property. Note that it is necessary to convert the value returned from

the

String property from a cell array to a string.

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Instrukcja Użytkownika Strona 195