MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Manual de usuario descargar pdf (Pagina 19)

How Does a GUI Work?

1-3

How Does a GUI Work?

Each component, and the GUI itself, is associated with one or more

user-written routines known as callbacks. The execution of each callback is

triggered by a particular user action such as a button push, mouse click,

selection of a menu item, or the cursor passing over a component. You, as the

creator of the GUI, provide these callbacks.

In the GUI described in “What Is a GUI?” on page 1-2, the user selects a data

set from the pop-up menu, then clicks one of the plot type buttons. Clicking the

button triggers the execution of a callback that plots the selected data in the

axes.

This kind of programming is often referred to as event-driven programming.

The event in the example is a button click. In event-driven programming,

callback execution is asynchronous, controlled by events external to the

software. In the case of MATLAB GUIs, these events usually take the form of

user interactions with the GUI.

The writer of a callback has no control over the sequence of events that leads

to its execution or, when the callback does execute, what other callbacks might

be running simultaneously.

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 329 330

Sin comentarios

MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Manual de usuario Pagina 19