MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Uživatelský manuál stáhnout pdf (Strana 241)

100

101

Callbacks for Specific Components

8-25

if strcmp(get(hObject,'Checked'),'on')

set(hObject,'Checked','off');

else

set(hObject,'Checked','on');

end

The strcmp function compares two strings and returns true when they match. In this

case, it returns true when the menu item’s Checked property matches the string, 'on'.

See “Create Menus for GUIDE UIs” for more information about creating menu items in

GUIDE. See “Create Menus for Programmatic UIs” for more information about creating

menu items programmatically.

Table

This code is an example of the table callback function, CellSelectionCallback.

Associate this function with the table CellSelectionCallback property to make it

execute when the end user selects cells in the table.

function uitable1_CellSelectionCallback(hObject, eventdata, handles)

% hObject handle to uitable1 (see GCBO)

% eventdata structure with the following fields

% Indices: row and column indices of the cell(s) currently selected

% handles structure with handles and user data (see GUIDATA)

data = get(hObject,'Data');

indices = eventdata.Indices;

r = indices(:,1);

c = indices(:,2);

linear_index = sub2ind(size(data),r,c);

selected_vals = data(linear_index);

selection_sum = sum(sum(selected_vals))

When the end user selects cells in the table, this function performs the following tasks:

• Gets all the values in the table and stores them in the variable, data.

• Gets the indices of the selected cells. These indices correspond to the rows and

columns in data.

• Converts the row and column indices into linear indices. The linear indices allow you

to select multiple elements in an array using one command.

• Gets the values that the end user selected and stores them in the variable,

selected_vals.

1 2 ... 236 237 238 239 240 241 242 243 244 245 246 ... 499 500

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