MATLAB Creating Graphical User Interfaces

Callback

Property

User Action Components That Use This

Property

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

How to Specify Callback Property Values

To associate a callback function with a UI component, set the value of one of the
component’s callback properties to be a reference to the callback function. Typically, you
do this when you define the component, but you can change callback property values
anywhere in your code.

Specify the callback property value in one of the following ways:

• “Specify a Function Handle” on page 10-7.


• “Specify a Cell Array” on page 10-8. This cell array contains a function handle as
  the first element, followed by and any input arguments you want to use in the function.


• “Specify an Anonymous Function” on page 10-9.


• “Specify a Character Vector Containing MATLAB Commands (Not Recommended)” on
  page 10-9

Specify a Function Handle

Function handles provide a way to represent a function as a variable. The function must
be a local or nested function in the same file as the app code, or you can write it in a
separate file that is on the MATLAB path.

To create the function handle, specify the @ operator before the name of the function. For
example, this uicontrol command specifies the Callback property to be a handle to
the function pushbutton_callback:

Write Callbacks for Apps Created Programmatically