CODEWITHSUNDEEP
javaswingwidthjcombobox
Altay_H
Altay_H

Reputation: 616

Make a JComboBox editable without affecting its width

I have a JComboBox object in my JFrame which behaves exactly as expected. However, I'd like to make it editable so that users can input alternative values if necessary. Unfortunately, using setEditable(true) to enable editing causes its width to increase significantly. How can I allow editing of the JComboBox while keeping its width only as wide as the largest selectable item requires?

The JComboBox is in a JPanel with a FlowLayout, however I don't think this is relevant because changing the width of the JPanel does not affect the width of the JComboBox.

uneditable jComboBox editable jComboBox

Upvotes: 3

Views: 1967

Answers (3)

camickr
camickr

Reputation: 324118

A JTextField has a default preferred size. It appears that if this size is greater than the preferred rendering size, then the text field size is used. You can change the preferred size by specifying the the number of columns to display in the text field. So you need to manipulate the editor with code something like:

JComboBox comboBox = new JComboBox( ... );
comboBox.setEditable( true );
ComboBoxEditor editor = comboBox.getEditor();
JTextField textField = (JTextField)editor.getEditorComponent();
textField.setColumns(3);

Upvotes: 3

mKorbel
mKorbel

Reputation: 109813

JComboBox@setPrototypeDisplayValue("XXXXXXXXXXXXXX")

Upvotes: 5

Alex Churchill
Alex Churchill

Reputation: 4957

Hmmm... I can't prompt this behavior on my Mac, but you might try creating/adding the combobox, then call 

Dimension size = box.getSize();
box.setEditable(true);
box.setSize(size); // or box.setMaximumSize(size);

Upvotes: 2

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