e861. 在两个组件之间共享输入映射和事件映射

By sharing an InputMap or ActionMap, any change to the shared InputMap or ActionMap will affect all components sharing the InputMap or ActionMap. WHEN_FOCUSED and WHEN_ANCESTOR_OF_FOCUSED_COMPONENT types of InputMaps can be shared. WHEN_IN_FOCUSED_WINDOW InputMaps cannot be shared.

    // Get an InputMap from the desired type of component and initialize it
    InputMap im = new JTextArea().getInputMap(JComponent.WHEN_FOCUSED);
    im.put(KeyStroke.getKeyStroke("F2"), "actionName");

    // Get an ActionMap from the desired type of component and initialize it
    ActionMap am =  new JTextArea().getActionMap();
    am.put("actionName",
        new AbstractAction("actionName") {
            public void actionPerformed(ActionEvent evt) {
process((JTextComponent)evt.getSource());
            }
        }
    );

    // Use the shared InputMap and ActionMap
component1.setInputMap(JComponent.WHEN_FOCUSED, im);
component2.setInputMap(JComponent.WHEN_FOCUSED, im);

    component1.setActionMap(am);
component2.setActionMap(am);

    // Now, any change to the shared InputMap or ActionMap will affect both component1 and component2
    im.put(KeyStroke.getKeyStroke("F3"), "actionName2");
    am.put("actionName2",
        new AbstractAction("actionName2") {
            public void actionPerformed(ActionEvent evt) {
process((JTextComponent)evt.getSource());
            }
        }
    );

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