Undoable Drawing : Redo Undo « Swing « Java Tutorial

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Java Tutorial » Swing » Redo Undo 
14. 113. 3. Undoable Drawing
Undoable Drawing
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Polygon;
import java.awt.event.ActionEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.Hashtable;

import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JToolBar;
import javax.swing.UIManager;
import javax.swing.event.UndoableEditListener;
import javax.swing.undo.CannotRedoException;
import javax.swing.undo.CannotUndoException;
import javax.swing.undo.StateEdit;
import javax.swing.undo.StateEditable;
import javax.swing.undo.UndoManager;
import javax.swing.undo.UndoableEditSupport;

public class UndoableDrawingPanel extends JPanel implements StateEditable {
  private static String POLYGON_KEY = "Polygon";

  UndoableEditSupport undoableEditSupport = new UndoableEditSupport(this);

  Polygon polygon = new Polygon();

  public UndoableDrawingPanel() {
    MouseListener mouseListener = new MouseAdapter() {
      public void mouseReleased(MouseEvent mouseEvent) {
        StateEdit stateEdit = new StateEdit(UndoableDrawingPanel.this);
        polygon.addPoint(mouseEvent.getX(), mouseEvent.getY());
        stateEdit.end();
        undoableEditSupport.postEdit(stateEdit);
        repaint();
      }
    };
    addMouseListener(mouseListener);
  }

  public void addUndoableEditListener(UndoableEditListener undoableEditListener) {
    undoableEditSupport.addUndoableEditListener(undoableEditListener);
  }

  public void removeUndoableEditListener(UndoableEditListener undoableEditListener) {
    undoableEditSupport.removeUndoableEditListener(undoableEditListener);
  }

  public void storeState(Hashtable state) {
    state.put(POLYGON_KEY, getPolygon());
  }

  public void restoreState(Hashtable state) {
    Polygon polygon = (Polygonstate.get(POLYGON_KEY);
    if (polygon != null) {
      setPolygon(polygon);
    }
  }

  public void setPolygon(Polygon newValue) {
    polygon = newValue;
    repaint();
  }

  public Polygon getPolygon() {
    Polygon returnValue;
    if (polygon.npoints == 0) {
      returnValue = new Polygon();
    else {
      returnValue = new Polygon(polygon.xpoints, polygon.ypoints, polygon.npoints);
    }
    return returnValue;
  }

  protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    g.drawPolygon(polygon);
  }

  public static void main(String args[]) {
    JFrame frame = new JFrame("Drawing Sample2");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    UndoableDrawingPanel drawingPanel = new UndoableDrawingPanel();

    UndoManager manager = new UndoManager();
    drawingPanel.addUndoableEditListener(manager);

    JToolBar toolbar = new JToolBar();
    JButton undoButton = new JButton(UndoManagerHelper.getUndoAction(manager));
    toolbar.add(undoButton);
    JButton redoButton = new JButton(UndoManagerHelper.getRedoAction(manager));
    toolbar.add(redoButton);

    frame.add(toolbar, BorderLayout.NORTH);
    frame.add(drawingPanel, BorderLayout.CENTER);
    frame.setSize(300150);
    frame.setVisible(true);

  }
}

class UndoManagerHelper {

  public static Action getUndoAction(UndoManager manager, String label) {
    return new UndoAction(manager, label);
  }

  public static Action getUndoAction(UndoManager manager) {
    return new UndoAction(manager, (StringUIManager.get("AbstractUndoableEdit.undoText"));
  }

  public static Action getRedoAction(UndoManager manager, String label) {
    return new RedoAction(manager, label);
  }

  public static Action getRedoAction(UndoManager manager) {
    return new RedoAction(manager, (StringUIManager.get("AbstractUndoableEdit.redoText"));
  }

  private abstract static class UndoRedoAction extends AbstractAction {
    UndoManager undoManager = new UndoManager();

    String errorMessage = "Cannot undo";

    String errorTitle = "Undo Problem";

    protected UndoRedoAction(UndoManager manager, String name) {
      super(name);
      undoManager = manager;
    }

    public void setErrorMessage(String newValue) {
      errorMessage = newValue;
    }

    public void setErrorTitle(String newValue) {
      errorTitle = newValue;
    }

    protected void showMessage(Object source) {
      if (source instanceof Component) {
        JOptionPane.showMessageDialog((Componentsource, errorMessage, errorTitle,
            JOptionPane.WARNING_MESSAGE);
      else {
        System.err.println(errorMessage);
      }
    }
  }

  public static class UndoAction extends UndoRedoAction {
    public UndoAction(UndoManager manager, String name) {
      super(manager, name);
      setErrorMessage("Cannot undo");
      setErrorTitle("Undo Problem");
    }

    public void actionPerformed(ActionEvent actionEvent) {
      try {
        undoManager.undo();
      catch (CannotUndoException cannotUndoException) {
        showMessage(actionEvent.getSource());
      }
    }
  }

  public static class RedoAction extends UndoRedoAction {
    public RedoAction(UndoManager manager, String name) {
      super(manager, name);
      setErrorMessage("Cannot redo");
      setErrorTitle("Redo Problem");
    }

    public void actionPerformed(ActionEvent actionEvent) {
      try {
        undoManager.redo();
      catch (CannotRedoException cannotRedoException) {
        showMessage(actionEvent.getSource());
      }
    }
  }
}
14. 113. Redo Undo
14. 113. 1. Undo EditorUndo Editor
14. 113. 2. Using the Undo Framework with Swing Text ComponentsUsing the Undo Framework with Swing Text Components
14. 113. 3. Undoable DrawingUndoable Drawing
14. 113. 4. Adding Undo and Redo to a Text Component
14. 113. 5. Bind the undo action to ctl-Z
14. 113. 6. Create a redo action and add it to the text component (JTextComponent)
14. 113. 7. Listen for undo and redo events
14. 113. 8. Create an undo action and add it to the text component
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