basicdateentryui.java

选择日期的SWING组件

/*
*   Copyright (c) 2001 Martin Newstead ([e-mail]).  All Rights Reserved.
*
*   The author makes no representations or warranties about the suitability of the
*   software, either express or implied, including but not limited to the
*   implied warranties of merchantability, fitness for a particular
*   purpose, or non-infringement. The author shall not be liable for any damages
*   suffered by licensee as a result of using, modifying or distributing
*   this software or its derivatives.
*
*   The author requests that he be notified of any application, applet, or other binary that
*   makes use of this code and that some acknowedgement is given. Comments, questions and
*   requests for change will be welcomed.
*/
package mseries.plaf.basic;

import mseries.Calendar.MDateSelectorPanel;
import mseries.Calendar.MMonthEvent;
import mseries.Calendar.MMonthListener;
import mseries.ui.*;
import mseries.utils.MComboBoxLayout;

import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.event.AncestorEvent;
import javax.swing.event.AncestorListener;
import javax.swing.plaf.ComponentUI;
import java.awt.*;
import java.awt.event.*;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.Date;
import java.util.Vector;


public class BasicDateEntryUI extends ComponentUI implements PropertyChangeListener
{
    // The arrow button that invokes the popup.
    protected JButton arrowButton;
    boolean isShowing = false;
    boolean mustClose = false;
    Action activator;
    Action openAction = new OpenAction();
    Action closeAction = new CloseAction();

    MDateField display;
    MDateSelectorPanel panel;
    MPopup popup;
    Border border = null;
    MMonthListener mMonthListener;
    AncestorListener ancListener;
    MouseListener mouseListener;
    protected MDateEntryField dateEntry;

    private final Object classLock = new Object();
    private static final int MAX_CACHE_SIZE = 1;
    private final Vector lightPopupCache = new Vector(MAX_CACHE_SIZE);
    private static final Vector heavyPopupCache = new Vector(MAX_CACHE_SIZE);
    Dimension d;

    /**
     *    This method is called by the UIManager to get an instance of
     *    this class and must be overridden in subclasses.
     */
    public static ComponentUI createUI(JComponent x)
    {
        return new BasicDateEntryUI();
    }

    /*
    *    Called by the UIManager to install the UI of the component
    */
    public void installUI(JComponent c)
    {
        dateEntry = (MDateEntryField) c;

        installComponents();

        configureDisplay(dateEntry.getDisplay());
        configureBorder(dateEntry);

        dateEntry.setLayout(createLayoutManager());

        installListeners();
    }

    public void uninstallUI(JComponent c)
    {
        dateEntry.setLayout(null);
        uninstallListeners();
        uninstallComponents();
    }

    public void update(Graphics g, JComponent c)
    {
        paint(g, c);
    }

    public void paint(Graphics g, JComponent c)
    {

    }

    protected void installListeners()
    {
        if ((activator = createActionListener()) != null)
        {
            arrowButton.addActionListener(activator);
        }
        if ((ancListener = createAncestorListener()) != null)
        {
            dateEntry.addAncestorListener(ancListener);
        }
        if ((mouseListener = createMouseListener()) != null)
        {
            arrowButton.addMouseListener(mouseListener);
        }
        registerKeyboardActions();
        mMonthListener = createMMonthListener();

        dateEntry.addPropertyChangeListener(this);

    }

    protected void uninstallListeners()
    {
        arrowButton.removeActionListener(activator);
        arrowButton.removeMouseListener(mouseListener);
        dateEntry.addPropertyChangeListener(this);
        unRegisterKeyboardActions();
        dateEntry.removeAncestorListener(ancListener);
    }

    /**
     * Creates the standard combo box layout manager that has the arrow button to
     * the right and the editor to the left.
     * Returns an instance of BasicComboBoxUI$ComboBoxLayoutManager.
     */
    protected LayoutManager createLayoutManager()
    {
        return new MComboBoxLayout();
    }

    /**
     * The editor and arrow button are added to the JComboBox here.
     */
    protected void installComponents()
    {
        display = dateEntry.getDisplay();
        dateEntry.add(display);

        arrowButton = createArrowButton();
        dateEntry.add(arrowButton);
    }

    protected void uninstallComponents()
    {
        arrowButton = null;
        dateEntry.removeAll();
    }

    /**
     * Creates the arrow button.  Subclasses can create any button they like.
     * The default behavior of this class is to attach various listeners to the
     * button returned by this method.
     * Returns an instance of BasicArrowButton.
     */
    protected JButton createArrowButton()
    {
        JButton x = new ArrowButton(ArrowButton.SOUTH);
        x.setBackground(dateEntry.getBackground());
        x.setForeground(dateEntry.getBackground());
        return x;
    }

    /**
     * Gets the insets from the JComboBox.
     */
    protected Insets getInsets()
    {
        return dateEntry.getInsets();
    }

    /**
     *   This is where we add a border the component, (the display field and the button)
     *   @param c the entire component
     */
    protected void configureBorder(JComponent c)
    {
    }

    /**
     *   This is where we would configure the display field part of the component, such as remove
     *   the dfault border and change preferred size.
     *   @param display the display part of the component
     */
    public void configureDisplay(JComponent display)
    {
    }


    /**
     *   Class to encapsulate the open and close action, activated by the button and
     *   keyboard keys
     */
    protected class OpenCloseAction extends AbstractAction
    {
        public void actionPerformed(ActionEvent e)
        {
            String command;
            command = getActionCommand(e);
            if (command.equals("OPEN"))
            {
                mustClose = false;
            }
            if (!isShowing)
            {
                if (mustClose)
                {
                    display.requestFocus();
                    return;
                }
                isShowing = true;
                showPopup();
            }
            else
            {
                isShowing = false;
                panel.close(command);
            }
        }

        protected String getActionCommand(ActionEvent e)
        {
            return e.getActionCommand();
        }
    }

    protected class OpenAction extends OpenCloseAction
    {
        protected String getActionCommand(ActionEvent e)
        {
            return "OPEN";
        }
    }

    protected class CloseAction extends OpenCloseAction
    {
        protected String getActionCommand(ActionEvent e)
        {
            return "CLOSE";
        }
    }

    protected Action createActionListener()
    {
        return new OpenCloseAction();
    }

    protected MouseListener createMouseListener()
    {
        /*  There follows a major cludge to get the popup to close
        *   properly.
        */

        return new MouseAdapter()
        {
            public void mousePressed(MouseEvent e)
            {
                display.requestFocus();
            }

            public void mouseReleased(MouseEvent e)
            {
                mustClose = isShowing;
            }

            public void mouseEntered(MouseEvent e)
            {
                mustClose = isShowing;
            }

            public void mouseExited(MouseEvent e)
            {
                mustClose = isShowing;
            }
        };
    }

    protected void registerKeyboardActions()
    {

        display.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, InputEvent.CTRL_MASK), "OPEN");
        display.getActionMap().put("OPEN", openAction);
    }

    protected void unRegisterKeyboardActions()
    {
        //display.unregisterKeyboardAction(KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, InputEvent.ALT_MASK));
    }


    private void showPopup()
    {
        if (panel == null)
        {
            panel = createMDateSelectorPanel();
        }
        if (popup == null)
        {
            dateEntry.notifyListeners(new FocusEvent(dateEntry, FocusEvent.FOCUS_GAINED));
            /*
            *   Remove the focus listener so that when the pull down receives the focus, the
            *   focusLost event is not caught
            */
            dateEntry.opened();
            Point p = dateEntry.getLocationOnScreen();

            panel.setShowTodayButton(dateEntry.getShowTodayButton());
            panel.setCloseOnToday(dateEntry.getCloseOnToday());
            panel.setPullDownConstraints(dateEntry.getConstraints());
            panel.setBorder(createBorder());
            d = panel.getPreferredSize();

            if (checkLightPosition(dateEntry, p))
            {
                popup = createLightWeightPopup();
            }
            else
            {
                checkHeavyPosition(dateEntry, p);
                popup = createHeavyWeightPopup();
            }

            /* This is where the MCalendarPanel is configured */


            if (display.getMinimum() != null)
            {
                panel.setMinimum(display.getMinimum());
            }
            if (display.getMaximum() != null)
            {
                panel.setMaximum(display.getMaximum());
            }

            panel.setDate(display.getValue(new Date()));
            panel.addMMonthListener(mMonthListener);

            popup.setShadow(dateEntry.getConstraints().hasShadow());
            popup.addComponent(panel, BorderLayout.CENTER);
            popup.pack();
            popup.setLocationOnScreen(p.x, p.y);
            popup.setParent(display);
            popup.setVisible(true);

            popup.requestFocus();
            dateEntry.notifyListeners(MChangeEvent.PULLDOWN_OPENED);
        }
    }

    private void destroyPopup()
    {
        if (popup != null)
        {
            panel.removeMMonthListener(mMonthListener);
            popup.setVisible(false);