CLIM 2 User Guide

Notice the Window Menu Button in the upper right corner. Pressing the left mouse button over it brings
up a menu of choices. Choosing Size allows you to change the size of the window. We have done so, making
the window bigger:
Clicking on the Quit button will cause the frame to be closed. You can clear the display pane portion by
evaluating
(window-clear *test-pane*)
*test-frame* and *test-pane*
The frame we have just created is the value of *test-frame*. The display pane inside the frame is the
value of *test-pane*. many of the examples in this manual use *test-frame* or *test-pane*.
If you wish to try those examples, you should create this frame and pane as indicated above.
Many CLIM operations need a context to work
Many CLIM operations need to be executed from within the context of a frame’s top level function. In particular
this ensures that *application-frame* is correctly bound. If you get unexpected results by
calling CLIM functions outside of this context (eg simply evaluating the forms within a listener) the first
thing you should try is to call the functions from within the frame’s top level. You can do this by defining
frame commands with :menu t and then activating the command from the running frame. e.g.
(define-test-command (com-clear :menu t) ()
(let ((stream (get-frame-pane *application-frame* ’display)))
(window-clear stream)))
Another alternative is to use the CLIM Lisp Listener demo. This provides a read-eval-print loop running
within the frame’s top level. *standard-output* can be used whenever a CLIM stream pane is
required. eg.
(window-clear *standard-output*)
20 CLIM 2.2 User Guide