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Java Set Focus CardLayout

Posted on 2014-12-18
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Last Modified: 2014-12-22
In the example here:
http://docs.oracle.com/javase/tutorial/uiswing/layout/card.html
How would I modify it so when we switch to the JTextField card, the JTextField has focus? Currently the ComboBox still has focus after switching to the JTextField card.

I've tried adding
cards.requestFocus();

Open in new window

with no effect.
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Question by:deleyd
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Expert Comment

by:krakatoa
ID: 40508758
You'd have to create a new JTextField

JTextField jtf = new JTextField("TextField",20);

Open in new window


and then call requestFocus() on it.
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Accepted Solution

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zzynx earned 500 total points
ID: 40509349
How would I modify it so when we switch to the JTextField card, the JTextField has focus?
by calling requestFocusInWindow() upon that JTextField instance when the tab selection is changed.

Remark: @ the documentation of the requestFocus() method I read:
Because the focus behavior of this method is platform-dependent, developers are strongly encouraged to use requestFocusInWindow when possible.
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Author Comment

by:deleyd
ID: 40509612
How can I determine which card (JPanel) is currently being shown?

Does KeyboardManager keep track of what component had focus for each card? Or do I need to do that manually? (So when I switch between cards, the component that last had focus on whichever card I switch to still has focus.)

Otherwise if Keyboard Manager doesn't keep track of which component has focus in all my JPanels, then I have to store that information myself, and retrieve it and set the focused component every time a JPanel is displayed. (In which case, what is the point of Keyboard Manager, if I have to do it manually anyway?)
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Author Closing Comment

by:deleyd
ID: 40510306
I found another page claiming drawback of CardLayout is:

focus is not placed on the Card as it is displayed
there is no API to determine which Card is currently being displayed

So they extended CardLayout to add those features:

http://tips4java.wordpress.com/2008/10/31/card-layout-focus/
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Expert Comment

by:zzynx
ID: 40512819
Thanx 4 axxepting
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