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javaswingjpanellisteners

Add listener to all objects in a JPanel

I have a JPanel with many objects, and one main action that can be performed: a calculation. There is a button to do this, but also a JTextField and other components in which the user might want to press enter in. For example, if you are selecting something from a JComboBox and press enter, the calculation will happen. Is there an easy way to add such a listener to all the contents from a JPanel, instead of adding actionListeners to every single component?

Solution

  • JPanel extends JComponent, that inherits Container. You can use getComponents(). You get a Component[] array, which you can loop through and add for each component, that is a subclass of Component like Button, and add the same ActionListener for each component. See http://docs.oracle.com/javase/6/docs/api/java/awt/Component.html