MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Manual do Utilizador descarregar pdf (Página 242)

10 Examples of GUIDE GUIs

10-18

Enabling Multiple Selection

To enable multiple selection in a list box, you must set the Min and Max

properties so that

Max Min > 1. This requires you to change the default Min

and

Max values of 0 and 1 to meet these conditions. Use the Property Inspector

to set these properties on the list box.

How Users Select Multiple Items

List box multiple selection follows the standard for most systems:

•

Control-click left mouse button — noncontiguous multi-item selection

•

Shift-click left mouse button — contiguous multi-item selection

Users must use one of these techniques to select the two variables required to

create the plot.

Returning Variable Names for the Plotting Functions

The get_var_names subroutine returns the two variable names that are

selected when the user clicks on one of the three plotting buttons. The function

• Gets the list of all items in the list box from the

String property.

• Gets the indices of the selected items from the

Value property.

• Returns two string variables, if there are two items selected. Otherwise

get_var_names displays an error dialog explaining that the user must select

two variables.

Here is the code for

get_var_names:

function [var1,var2] = get_var_names(handles)

list_entries = get(handles.listbox1,'String');

index_selected = get(handles.listbox1,'Value');

if length(index_selected) ~= 2

errordlg('You must select two variables',...

'Incorrect Selection','modal')

else

var1 = list_entries{index_selected(1)};

var2 = list_entries{index_selected(2)};

end

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Manual do Utilizador Página 242