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Java javax.swing Class JSpinner.DefaultEditor（JDK8）

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Java™ Platform
Standard Ed. 8
javax.swing

Class JSpinner.DefaultEditor

  • All Implemented Interfaces:
    ImageObserver, LayoutManager, MenuContainer, PropertyChangeListener, Serializable, EventListener, Accessible, ChangeListener
    Direct Known Subclasses:
    JSpinner.DateEditor, JSpinner.ListEditor, JSpinner.NumberEditor
    Enclosing class:
    JSpinner 

    public static class JSpinner.DefaultEditor
extends JPanel
implements ChangeListener, PropertyChangeListener, LayoutManager
    A simple base class for more specialized editors that displays a read-only view of the model's current value with a JFormattedTextField. Subclasses can configure the JFormattedTextField to create an editor that's appropriate for the type of model they support and they may want to override the stateChanged and propertyChanged methods, which keep the model and the text field in sync.

    This class defines a dismiss method that removes the editors ChangeListener from the JSpinner that it's part of. The setEditor method knows about DefaultEditor.dismiss, so if the developer replaces an editor that's derived from JSpinner.DefaultEditor its ChangeListener connection back to the JSpinner will be removed. However after that, it's up to the developer to manage their editor listeners. Similarly, if a subclass overrides createEditor, it's up to the subclasser to deal with their editor subsequently being replaced (with setEditor). We expect that in most cases, and in editor installed with setEditor or created by a createEditor override, will not be replaced anyway.

    This class is the LayoutManager for it's single JFormattedTextField child. By default the child is just centered with the parents insets.

    Since:
    1.4

    • Constructor Detail

      • DefaultEditor

        public DefaultEditor(JSpinner spinner)
        Constructs an editor component for the specified JSpinner. This DefaultEditor is it's own layout manager and it is added to the spinner's ChangeListener list. The constructor creates a single JFormattedTextField child, initializes it's value to be the spinner model's current value and adds it to this DefaultEditor.
        Parameters:
        spinner - the spinner whose model this editor will monitor
        See Also:
        getTextField(), JSpinner.addChangeListener(javax.swing.event.ChangeListener)

    • Method Detail

      • dismiss

        public void dismiss(JSpinner spinner)
        Disconnect this editor from the specified JSpinner. By default, this method removes itself from the spinners ChangeListener list.
        Parameters:
        spinner - the JSpinner to disconnect this editor from; the same spinner as was passed to the constructor.

      • getSpinner

        public JSpinner getSpinner()
        Returns the JSpinner ancestor of this editor or null if none of the ancestors are a JSpinner. Typically the editor's parent is a JSpinner however subclasses of JSpinner may override the the createEditor method and insert one or more containers between the JSpinner and it's editor.
        Returns:
        JSpinner ancestor; null if none of the ancestors are a JSpinner
        See Also:
        JSpinner.createEditor(javax.swing.SpinnerModel)

      • getTextField

        public JFormattedTextField getTextField()
        Returns the JFormattedTextField child of this editor. By default the text field is the first and only child of editor.
        Returns:
        the JFormattedTextField that gives the user access to the SpinnerDateModel's value.
        See Also:
        getSpinner(), JSpinner.getModel()

      • stateChanged

        public void stateChanged(ChangeEvent e)
        This method is called when the spinner's model's state changes. It sets the value of the text field to the current value of the spinners model.
        Specified by:
        stateChanged in interface ChangeListener
        Parameters:
        e - the ChangeEvent whose source is the JSpinner whose model has changed.
        See Also:
        getTextField(), JSpinner.getValue()

      • propertyChange

        public void propertyChange(PropertyChangeEvent e)
        Called by the JFormattedTextField PropertyChangeListener. When the "value" property changes, which implies that the user has typed a new number, we set the value of the spinners model.

        This class ignores PropertyChangeEvents whose source is not the JFormattedTextField, so subclasses may safely make this DefaultEditor a PropertyChangeListener on other objects.

        Specified by:
        propertyChange in interface PropertyChangeListener
        Parameters:
        e - the PropertyChangeEvent whose source is the JFormattedTextField created by this class.
        See Also:
        getTextField()

      • addLayoutComponent

        public void addLayoutComponent(String name,
                               Component child)
        This LayoutManager method does nothing. We're only managing a single child and there's no support for layout constraints.
        Specified by:
        addLayoutComponent in interface LayoutManager
        Parameters:
        name - ignored
        child - ignored

      • removeLayoutComponent

        public void removeLayoutComponent(Component child)
        This LayoutManager method does nothing. There isn't any per-child state.
        Specified by:
        removeLayoutComponent in interface LayoutManager
        Parameters:
        child - ignored

      • layoutContainer

        public void layoutContainer(Container parent)
        Resize the one (and only) child to completely fill the area within the parents insets.
        Specified by:
        layoutContainer in interface LayoutManager
        Parameters:
        parent - the container to be laid out

      • commitEdit

        public void commitEdit()
                throws ParseException
        Pushes the currently edited value to the SpinnerModel.

        The default implementation invokes commitEdit on the JFormattedTextField.

        Throws:
        ParseException - if the edited value is not legal
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Java™ Platform
Standard Ed. 8

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