datecombobox.java

更方便的SWING

    protected Color selectedBackground;
    protected Color selectedForeground;
    protected Color background;
    protected Color foreground;

    public DatePopup(DateComboBox comboBox) {
      this.comboBox = comboBox;
      calendar = Calendar.getInstance();
      // check Look and Feel
      background = UIManager.getColor("Panel.background");
      foreground = UIManager.getColor("Panel.foreground");
      selectedBackground = UIManager.getColor("ComboBox.selectionBackground");
      selectedForeground = UIManager.getColor("ComboBox.selectionForeground");

      initializePopup();
    }

    //========================================
    // begin ComboPopup method implementations
    //
    public void show() {
      try {
        // if setSelectedItem() was called with a valid date, adjust the calendar
        java.util.Date dt = comboBox.getDate();
        calendar.setTime(dt);
      }
      catch (Exception e) {
      }
      updatePopup();
      popup.show(comboBox, 0, comboBox.getHeight());
    }

    public void hide() {
      popup.setVisible(false);
    }

    protected JList list = new JList();
    public JList getList() {
      return list;
    }

    public MouseListener getMouseListener() {
      return this;
    }

    public MouseMotionListener getMouseMotionListener() {
      return this;
    }

    public KeyListener getKeyListener() {
      return this;
    }

    public boolean isVisible() {
      return popup.isVisible();
    }

    public void uninstallingUI() {
      popup.removePopupMenuListener(this);
    }

    //
    // end ComboPopup method implementations
    //======================================

    //===================================================================
    // begin Event Listeners
    //

    // MouseListener

    public void mousePressed(MouseEvent e) {
    }
    public void mouseReleased(MouseEvent e) {
    }
    // something else registered for MousePressed
    public void mouseClicked(MouseEvent e) {
      if (!SwingUtilities.isLeftMouseButton(e))
        return;
      if (!comboBox.isEnabled())
        return;
      if (comboBox.isEditable()) {
        //comboBox.getEditor().getEditorComponent().requestFocus();
      }
      else {
        //comboBox.requestFocus();
      }
      togglePopup();
    }

    protected boolean mouseInside = false;
    public void mouseEntered(MouseEvent e) {
      mouseInside = true;
    }
    public void mouseExited(MouseEvent e) {
      mouseInside = false;
    }

    // MouseMotionListener
    public void mouseDragged(MouseEvent e) {
    }
    public void mouseMoved(MouseEvent e) {
    }

    // KeyListener
    public void keyPressed(KeyEvent e) {
    }
    public void keyTyped(KeyEvent e) {
    }
    public void keyReleased(KeyEvent e) {
      if (e.getKeyCode() == KeyEvent.VK_SPACE || e.getKeyCode() == KeyEvent.VK_ENTER) {
        togglePopup();
      }
    }

    /**
     * Variables hideNext and mouseInside are used to
     * hide the popupMenu by clicking the mouse in the JComboBox
     */
    public void popupMenuCanceled(PopupMenuEvent e) {
    }
    protected boolean hideNext = false;
    public void popupMenuWillBecomeInvisible(PopupMenuEvent e) {
      hideNext = mouseInside;
    }
    public void popupMenuWillBecomeVisible(PopupMenuEvent e) {
    }

    //
    // end Event Listeners
    //=================================================================

    //===================================================================
    // begin Utility methods
    //

    protected void togglePopup() {
      if (isVisible() || hideNext) {
        hide();
      }
      else {
        show();
      }
      hideNext = false;
    }

    //
    // end Utility methods
    //=================================================================

    // Note *** did not use JButton because Popup closes when pressed
    protected JLabel createUpdateButton(final int field, final int amount) {
      final JLabel label = new JLabel();
      final Border selectedBorder = new EtchedBorder();
      final Border unselectedBorder = new EmptyBorder(selectedBorder.getBorderInsets(new JLabel()));
      label.setBorder(unselectedBorder);
      label.setForeground(foreground);
      label.addMouseListener(new MouseAdapter() {
        public void mouseReleased(MouseEvent e) {
          calendar.add(field, amount);
          updatePopup();
        }
        public void mouseEntered(MouseEvent e) {
          label.setBorder(selectedBorder);
        }
        public void mouseExited(MouseEvent e) {
          label.setBorder(unselectedBorder);
        }
      });
      return label;
    }

    protected void initializePopup() {
      JPanel header = new JPanel(); // used Box, but it wasn't Opaque
      header.setLayout(new BoxLayout(header, BoxLayout.X_AXIS));
      header.setBackground(background);
      header.setOpaque(true);

      JLabel label;
      label = createUpdateButton(Calendar.YEAR, -1);
      label.setText("<<");
      label.setToolTipText("Previous Year");

      header.add(Box.createHorizontalStrut(12));
      header.add(label);
      header.add(Box.createHorizontalStrut(12));

      label = createUpdateButton(Calendar.MONTH, -1);
      label.setText("<");
      label.setToolTipText("Previous Month");
      header.add(label);

      monthLabel = new JLabel("", JLabel.CENTER);
      monthLabel.setForeground(foreground);
      header.add(Box.createHorizontalGlue());
      header.add(monthLabel);
      header.add(Box.createHorizontalGlue());

      label = createUpdateButton(Calendar.MONTH, 1);
      label.setText(">");
      label.setToolTipText("Next Month");
      header.add(label);

      label = createUpdateButton(Calendar.YEAR, 1);
      label.setText(">>");
      label.setToolTipText("Next Year");

      header.add(Box.createHorizontalStrut(12));
      header.add(label);
      header.add(Box.createHorizontalStrut(12));

      popup = new JPopupMenu();
      popup.setBorder(BorderFactory.createLineBorder(Color.black));
      popup.setLayout(new BorderLayout());
      popup.setBackground(background);
      popup.addPopupMenuListener(this);
      popup.add(BorderLayout.NORTH, header);
    }

    // update the Popup when either the month or the year of the calendar has been changed
    protected void updatePopup() {
      monthLabel.setText(monthFormat.format(calendar.getTime()));
      if (days != null) {
        popup.remove(days);
      }
      days = new JPanel(new GridLayout(0, 7));
      days.setBackground(background);
      days.setOpaque(true);

      Calendar setupCalendar = (Calendar) calendar.clone();
      setupCalendar.set(Calendar.DAY_OF_WEEK, setupCalendar.getFirstDayOfWeek());
      for (int i = 0; i < 7; i++) {
        int dayInt = setupCalendar.get(Calendar.DAY_OF_WEEK);
        JLabel label = new JLabel();
        label.setHorizontalAlignment(JLabel.CENTER);
        label.setForeground(foreground);
        if (dayInt == Calendar.SUNDAY) {
          label.setText("Sun");
        }
        else if (dayInt == Calendar.MONDAY) {
          label.setText("Mon");
        }
        else if (dayInt == Calendar.TUESDAY) {
          label.setText("Tue");
        }
        else if (dayInt == Calendar.WEDNESDAY) {
          label.setText("Wed");
        }
        else if (dayInt == Calendar.THURSDAY) {
          label.setText("Thu");
        }
        else if (dayInt == Calendar.FRIDAY) {
          label.setText("Fri");
        }
        else if (dayInt == Calendar.SATURDAY) {
          label.setText("Sat");
        }
        days.add(label);
        setupCalendar.roll(Calendar.DAY_OF_WEEK, true);
      }

      setupCalendar = (Calendar) calendar.clone();
      setupCalendar.set(Calendar.DAY_OF_MONTH, 1);
      int first = setupCalendar.get(Calendar.DAY_OF_WEEK);
      for (int i = 0; i < (first - 1); i++) {
        days.add(new JLabel(""));
      }
      for (int i = 1; i <= setupCalendar.getActualMaximum(Calendar.DAY_OF_MONTH); i++) {
        final int day = i;
        final JLabel label = new JLabel(String.valueOf(day));
        label.setHorizontalAlignment(JLabel.CENTER);
        label.setForeground(foreground);
        label.addMouseListener(new MouseListener() {
          public void mousePressed(MouseEvent e) {
          }
          public void mouseClicked(MouseEvent e) {
          }
          public void mouseReleased(MouseEvent e) {
            label.setOpaque(false);
            label.setBackground(background);
            label.setForeground(foreground);
            calendar.set(Calendar.DAY_OF_MONTH, day);
            comboBox.setDate(calendar.getTime());
            //comboBox.setSelectedItem(dateFormat.format(calendar.getTime()));
            hide();
            // hide is called with setSelectedItem() ... removeAll()
            //comboBox.getEditor().getEditorComponent().requestFocus();
          }
          public void mouseEntered(MouseEvent e) {
            label.setOpaque(true);
            label.setBackground(selectedBackground);
            label.setForeground(selectedForeground);
          }
          public void mouseExited(MouseEvent e) {
            label.setOpaque(false);
            label.setBackground(background);
            label.setForeground(foreground);
          }
        });

        days.add(label);
      }

      popup.add(BorderLayout.CENTER, days);
      popup.pack();
    }
  }

  //////////////////////////////////////////////////////////////
  // This is only included to provide a sample GUI
  //////////////////////////////////////////////////////////////
  public static void main(String args[]) {
    JFrame f = new JFrame();
    Container c = f.getContentPane();
    c.setLayout(new FlowLayout());
    c.add(new JLabel("Date 1:"));
    DateComboBox box = new DateComboBox();
    box.setName("One");
    c.add(box);
    c.add(new JLabel("Date 2:"));
    DateComboBox dcb = new DateComboBox();
    dcb.setName("Two");
    c.add(dcb);
    f.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });

    try {
      String sLookAndFeel = "com.sun.java.swing.plaf.windows.WindowsLookAndFeel";
      UIManager.setLookAndFeel(sLookAndFeel);
      SwingUtilities.updateComponentTreeUI(f);
    }
    catch (Exception ex) {
    }

    f.setSize(500, 200);
    f.show();
  }

}