Java Foundation Classes in a Nutshell

public float getLayoutAlignmentY(Container target);

public void invalidateLayout(Container target);

public java.awt.Dimension maximumLayoutSize(Container target);

}

Hierar chy: Object→ Over layLayout(java.awt.LayoutManager2(java.awt.LayoutManager), Serializable)

ProgressMonitor Ja va 1.2

javax.swing

This class implements a progr ess monitor. After creating a ProgressMonitor,aprogram

periodically calls setProgress() to indicate its progr ess toward the completion of a task.

Unless progr ess is quite rapid, the ProgressMonitor displays a dialog box that uses a JPro-

gressBar to display progr ess to the user. Call setNote() to set the text to display in the dia-

log box. You can also specify a permanent title or heading for the dialog box with the

second argument to the constructor. The ProgressMonitor dialog box automatically closes

when the progress pr operty reaches the value of the maximum pr operty. If you want to

close it before the task completes, call close().

ProgressMonitor suf fers fr om an important flaw: if the user clicks the Cancel buttons in

the dialog box, the dialog is dismissed. Unfortunately, the dialog does not fire any

event to indicate that this has happened, so your program must call isCancelled() each

time it calls setProgress(),todeter mine whether the user has requested that the operation

be cancelled. A related flaw is that the dialog box contains an extraneous Okay button ...