MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Guia do Utilizador descarregar pdf (Página 678)

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15 Examples of GUIs Created Programmatically

Define the Callbacks

This topic defines the callbacks that service the components of the GUI.

Because the callback definitions are at a lower level than the component

definitions and the data created for the GUI, they have access to all data

and component handles.

Although the GUI has six com ponents that are serviced b y callbacks, there

are only four callback functions. This is because the Open menu item and the

Open toolbar button

share the same callbacks. Similarly, the Print menu

item and the Print toolbar button

share the same callbacks.

• “Update Button Callback” on page 15-14

• “Open Menu Item Callback” on page 15-15

• “Print M enu Item Callback” on page 15-16

• “Close Menu Item Callback” on page 15-17

Note These are the callbacks that were specified in the component definitions,

“Create the GUI and Its Components” on page 15-8.

Update Button Callback

The hUpdateButtonCallback function services the Update push button.

Clicking the Update button triggers the execution of this callback function.

function hUpdat eBut tonCallback(hObject, eventdata)

% Callback function run when the Update but ton is pressed

localUpdatePlot();

end

The localUpdatePlot function is a helper function that plots the selected plot

type in the axes. It is defined later in the script, “Helper Function: Plot the

Plot Types” on page 15-18.

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