MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Manual de usuario descargar pdf (Pagina 197)

Examples: Programming GUI Components

8-25

is fixed, then you can use this approach. Else, you can use the index to retrieve

the actual string for the selected item.

function popupmenu1_Callback(hObject, eventdata, handles)

val = get(hObject,'Value');

switch val

case 1

% User selected the first item

case 2

% User selected the second item

% Proceed with callback...

Using the Index to Determine the Selected String

This example retrieves the actual string selected in the pop-up menu. It uses

the pop-up menu

Value property to index into the list of strings. This approach

may be useful if your program dynamically loads the contents of the pop-up

menu based on user action and you need to obtain the selected string. Note that

it is necessary to convert the value returned by the

String property from a cell

array to a string.

function popupmenu1_Callback(hObject, eventdata, handles)

val = get(hObject,'Value');

string_list = get(hObject,'String');

selected_string = string_list{val}; % Convert from cell array

% to string

% Proceed with callback...

Panel

Panels group GUI components and can make a GUI easier to understand by

visually grouping related controls. A panel can contain panels and button

groups as well as axes and user interface controls such as push buttons, sliders,

pop-up menus, etc. The position of each component within a panel is

interpreted relative to the lower left corner of the panel.

If the GUI is resized, the panel and its components are also resized, but you

may want to adjust the size and position of the panel’s components. You can do

this if you set the GUI

Resize behavior to Other (Use ResizeFcn) and provide

ResizeFcn callback for the panel.

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Manual de usuario Pagina 197