如何在Java中使JFrame模糊？

Question

In my java program, when the user clicks on a button in the main JFrame another JFrame becomes visible on top of the main frame. Now how to make the previous frame blurred? Exactly like the background in the image :

Answer 1

Now how to make the previous frame blurred?

• have look at JLayer(Java7) based on JXLayer(Java6) ,

• similair effect is possible with GlassPane , or with JViewport (not proper of ways, but good Swing GUI contains JScrollPane as 1st. JComponent in JFrame / JDialog / JWindow )

Answer 2

I'm assuming that you are coding using Java Swing, and the picture is the effect you want.

You would use a JDialog to create the top window, rather than a JFrame . A JDialog is designed to be modal. In other words, lock the JFrame until the JDialog is closed.

The default behavior of a JDialog is to not blur or darken the underlying JFrame . In order to darken the underlying JFrame , you're going to have to paint a black image on the glass pane of the JFrame .

This tutorial shows you how to manipulate the root panes of a JFrame .

Answer 3

JFrame提供了setOpacity(float opacity)方法（实际上是从Frame继承）。