Swing/DisableScrolling のバックアップ(No.8)

TITLE:JScrollPaneのスクロールを禁止

Posted by aterai at 2005-10-03

JScrollPaneのスクロールを禁止

JScrollPaneのスクロールを一時的に禁止します。

&jnlp;
&jar;
&zip;

サンプルコード

JCheckBox b = new JCheckBox("スクロールを禁止する");
b.addItemListener(new ItemListener() {
  public void itemStateChanged(ItemEvent ie) {
    JCheckBox box = (JCheckBox)ie.getSource();
    boolean flag = !box.isSelected();
    JScrollBar bar = scrollPane.getVerticalScrollBar();
    bar.setEnabled(flag);
    scrollPane.setWheelScrollingEnabled(flag);
    table.setEnabled(flag);
  }
});

解説

スクロールバーを取得し、JScrollBar#setEnabled(boolean)メソッドを使って、これを無効にします。
JScrollPane#setWheelScrollingEnabled(boolean)メソッドで、マウスホイールによるスクロールを無効にします。
JScrollPaneに配置したコンポーネントをsetEnabled(false)とし、フォーカスの移動などによるスクロールを無効にします。

JDK 1.7.0 で追加されたJLayerを使用して、以下のように入力を禁止する方法もあります。

JLayerで指定したコンポーネントへの入力を禁止

//package example;
//-*- mode:java; encoding:utf8n; coding:utf-8 -*-
// vim:set fileencoding=utf-8:
//@homepage@
import java.awt.*;
import java.awt.event.*;
import java.beans.PropertyChangeEvent;
import javax.swing.*;
import javax.swing.plaf.LayerUI;
import javax.swing.table.*;

public class MainPanel extends JPanel {
  private final String[] columnNames = {"String", "Integer", "Boolean"};
  private final Object[][] data = {
    {"aaa", 12, true}, {"bbb", 5, false},
    {"CCC", 92, true}, {"DDD", 0, false},
  };
  DefaultTableModel model = new DefaultTableModel(data, columnNames) {
    @Override public Class<?> getColumnClass(int column) {
      return getValueAt(0, column).getClass();
    }
  };
  private final JTable table     = new JTable(model);
  private final JScrollPane scroll = new JScrollPane(table);
  private final JCheckBox check  = new JCheckBox("Disable Scrolling");
  public MainPanel() {
    super(new BorderLayout());
    TableColumn col = table.getColumnModel().getColumn(0);
    col.setMinWidth(60);
    col.setMaxWidth(60);
    col.setResizable(false);

    for(int i=0;i<100;i++) { model.addRow(
      new Object[] {"Name "+i, Integer.valueOf(i), Boolean.FALSE}); }

    final DisableInputLayerUI layerUI = new DisableInputLayerUI();
    final JLayer<JComponent> jlayer = new JLayer<JComponent>(scroll, layerUI);

    check.addItemListener(new ItemListener() {
      @Override public void itemStateChanged(ItemEvent ie) {
        JCheckBox box = (JCheckBox)ie.getSource();
        layerUI.setEnabled(!box.isSelected());
//         JScrollBar bar = scroll.getVerticalScrollBar();
//         bar.setEnabled(flag);
//         scroll.setWheelScrollingEnabled(flag);
//         table.setEnabled(flag);
      }
    });

    scroll.setComponentPopupMenu(new TablePopupMenu());
    table.setInheritsPopupMenu(true);

    add(jlayer);
    add(check,  BorderLayout.NORTH);
    setPreferredSize(new Dimension(320, 240));
  }

  class TestCreateAction extends AbstractAction{
    public TestCreateAction(String label, Icon icon) {
      super(label,icon);
    }
    @Override public void actionPerformed(ActionEvent evt) {
      testCreateActionPerformed(evt);
    }
  }
  private void testCreateActionPerformed(ActionEvent e) {
    model.addRow(new Object[] {"New Name", Integer.valueOf(0), Boolean.FALSE});
    Rectangle rect = table.getCellRect(model.getRowCount()-1, 0, true);
    table.scrollRectToVisible(rect);
  }

  class DeleteAction extends AbstractAction{
    public DeleteAction(String label, Icon icon) {
      super(label,icon);
    }
    @Override public void actionPerformed(ActionEvent evt) {
      deleteActionPerformed(evt);
    }
  }
  public void deleteActionPerformed(ActionEvent evt) {
    int[] selection = table.getSelectedRows();
    if(selection==null || selection.length<=0) return;
    for(int i=selection.length-1;i>=0;i--) {
      model.removeRow(table.convertRowIndexToModel(selection[i]));
    }
  }

  private class TablePopupMenu extends JPopupMenu {
    private final Action createAction = new TestCreateAction("add", null);
    private final Action deleteAction = new DeleteAction("delete", null);
    public TablePopupMenu() {
      super();
      add(createAction);
      addSeparator();
      add(deleteAction);
    }
    @Override public void show(Component c, int x, int y) {
      createAction.setEnabled(!check.isSelected());
      int[] l = table.getSelectedRows();
      deleteAction.setEnabled(l!=null && l.length>0);
      super.show(c, x, y);
    }
  }

  public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
      @Override public void run() {
        createAndShowGUI();
      }
    });
  }
  public static void createAndShowGUI() {
    try{
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    }catch(Exception e) {
      e.printStackTrace();
    }
    JFrame frame = new JFrame("@title@");
    frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    frame.getContentPane().add(new MainPanel());
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
  }
}
class DisableInputLayerUI extends LayerUI<JComponent> {
  private boolean isBlocking = false;
  @Override public void paint(Graphics g, JComponent c) {
    super.paint(g, c);
    if(!isBlocking) return;
    Graphics2D g2 = (Graphics2D) g.create();
    g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, .5f));
    g2.setPaint(Color.GRAY);
    g2.fillRect(0, 0, c.getWidth(), c.getHeight());
    g2.dispose();
  }
  @Override public void installUI(JComponent c) {
    super.installUI(c);
    JLayer jlayer = (JLayer)c;
    jlayer.setLayerEventMask(
      AWTEvent.MOUSE_EVENT_MASK |
      AWTEvent.MOUSE_MOTION_EVENT_MASK |
      AWTEvent.MOUSE_WHEEL_EVENT_MASK |
      AWTEvent.KEY_EVENT_MASK);
  }
  @Override public void uninstallUI(JComponent c) {
    JLayer jlayer = (JLayer)c;
    jlayer.setLayerEventMask(0);
    super.uninstallUI(c);
  }
  @Override public void eventDispatched(AWTEvent e, JLayer l) {
    if(isBlocking && e instanceof InputEvent) {
      ((InputEvent)e).consume();
    }
  }
  private static final String CMD_REPAINT = "repaint";
  public void setEnabled(boolean flag) {
    isBlocking = !flag;
    firePropertyChange(CMD_REPAINT,flag,!flag);
  }
  @Override public void applyPropertyChange(PropertyChangeEvent pce, JLayer l) {
    String cmd = pce.getPropertyName();
    if(CMD_REPAINT.equals(cmd)) {
      l.getGlassPane().setVisible((Boolean)pce.getNewValue());
      l.repaint();
    }
  }
}

JScrollPaneのスクロールを禁止

サンプルコード

解説

コメント