MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Bedienungsanleitung PDF herunterladen (Seite 296)

12 Examples of GUIs Created Programmatically

12-18

Defining 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 components that are serviced by 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 12-18

• “Open Menu Item Callback” on page 12-19

• “Print Menu Item Callback” on page 12-20

• “Close Menu Item Callback” on page 12-20

Note These are the callbacks that were specified in the component

definitions, “Creating the GUI and Its Components” on page 12-12.

Update Button Callback

The hUpdateButtonCallback function services the Update push button.

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

function hUpdateButtonCallback(hObject, eventdata)

% Callback function run when the Update button 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: Plotting the

Plot Types” on page 12-21.

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MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Bedienungsanleitung Seite 296