MATLAB Creating Graphical User Interfaces

Callback

Property

User Action Components That Use This

Property

WindowButtonM

otionFcn

End user moves the pointer within

the figure window.

figure

WindowButtonU

pFcn

End user releases a mouse button. figure

WindowKeyPres

sFcn

End user presses a key while the

pointer is on the figure or any of

its child objects.

figure

WindowKeyRele

aseFcn

End user releases a key while the

pointer is on the figure or any of

its child objects.

figure

WindowScrollW

heelFcn

End user turns the mouse wheel

while the pointer is on the figure.

figure

GUIDE-Generated Callback Functions and Property Values

How GUIDE Manages Callback Functions and Properties

After you add a uicontrol, uimenu, or uicontextmenu component to your UI, but

before you save it, GUIDE populates the Callback property with the value, %automatic.

This value indicates that GUIDE will generate a name for the callback function.

When you save your UI, GUIDE adds an empty callback function definition to your code

file, and it sets the control’s Callback property to be an anonymous function. This

function definition is an example of a GUIDE-generated callback function for a push

button.

function pushbutton1_Callback(hObject,eventdata,handles)

% hObject handle to pushbutton1 (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

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

end

If you save this UI with the name, myui, then GUIDE sets the push button’s Callback

property to the following value:

@(hObject,eventdata)myui('pushbutton1_Callback',hObject,eventdata,guidata(hObject))

This is an anonymous function that serves as a reference to the function,

pushbutton1_Callback. This anonymous function has four input arguments. The first

7 Programming a GUIDE App