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When a user interface element (window, control, menu) is created, a special predicate must be defined to handle incoming messages.
The first argument of such a predicate is a message name. Presently
this can be one of the following:
init | sent upon creation |
close | tries to close the windowIf the window predicate processing this message fails then the window will be closed, otherwise it will not be closed (example SUN).. |
mouse_click (X,Y) | (left button) mouse clicked at coordinates X, Y inside the client area |
r_mouse_click (X,Y) | (right button) mouse clicked at coordinates X, Y inside the client area |
size (X,Y) | the window changed its size and the new size of its client area is X, Y. |
press | button or menu item was pressed |
paint | the window must be redrawn |
Note: if you do not want to process the messages to some given window, a predicate with no clauses for it should be declared as the window's function (e.g. fail(X)).
See also: