MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Manual de usuario descargar pdf (Pagina 198)

8 Programming the GUI

8-26

Note To set Resize behavior for the figure to Other (Use ResizeFcn), select

GUI Options from the Layout Editor Tools menu.

1 This example of a ResizeFcn callback retrieves the handles of its children

from its

Children property.

The order in which components appear in a child list is the reverse of the

order in which they tab. See “Setting Tab Order” on page 6-45 for

information about using the Tab Order Editor to determine the tab order.

2 It then modifies the Position properties of the child components relative to

the panel’s new size. The

Position property is a four-element vector that

specifies the size of the component and its location with respect to the bottom

left corner of its parent. The vector is of the form:

[left bottom width height]

The example assumes the panel Units property is normalized. That is, units

map the lower-left corner of the panel to (0,0) and the upper-right corner to

(1.0,1.0). Because of this, the example can modify the component size

relative to the panel size without knowing the actual size of the panel. It

positions the left edge of a button 20% of the panel’s width from the left edge

of the panel and its bottom edge 40% of the panel’s height from the bottom

of the panel. It sets the button’s height to be 50% of the panel’s width and

20% of its height.

function uipanel1_ResizeFcn(hObject, eventdata, handles)

children = get(hObject,'Children');

child_position = get(children(1);'Position');

child_position = [.20,.40,.50,.20];

set(children(1),'Position',child_position);

% Proceed with callback...

Button Group

Button groups are like panels, but can be used to manage exclusive selection

behavior for radio buttons and toggle buttons. The button group’s

SelectionChangeFcn callback is called whenever a selection is made.

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Manual de usuario Pagina 198