zundomanager.java

用Java写的报表.功能如下: 0.内建网络打印,网络预览功能！ 1.文件操作。包括url 指定的文件。 2.全功能打印支持。包括打印预览。 3.Undo 和 redo。 4.合并单元格。 5.Cel

/*
 * Copyright 2002 EZCell , Inc. All rights reserved.
 * Version  1.0.
 * Author   W.John
 */
package ezcell;

import java.util.Vector;
import javax.swing.undo.CannotUndoException;
import javax.swing.undo.UndoManager;
import javax.swing.undo.UndoableEdit;


/**
 * DOCUMENT ME!
 *
 * @version 1.00
 * @author W.John
 */
public class ZUndoManager extends UndoManager {
    private Vector listeners = new Vector();
    ZCommand currentCmd;

    /**
    *
    * @return
    */
    public ZCommand getCurrentCommand() {
        return currentCmd;
    }

    /**
    *
    * @param cmd
    */
    public void addCommand(Object cmd) {
        if (addEdit((UndoableEdit) cmd)) {
            currentCmd = (ZCommand) cmd;
            fireCommandJoined();
        }
    }

    /**
    *
    * @param lst
    */
    public void addListener(ZUndoManagerListener lst) {
        listeners.add(lst);
    }

    /**
    */
    public synchronized void discardAllEdits() {
        if (edits.isEmpty()) {
            return;
        }

        super.discardAllEdits();
        fireCommandListChanged();
    }

    /**
    *
    * @throws CannotUndoException
    */
    public synchronized void redo() throws CannotUndoException {
        currentCmd = (ZCommand) editToBeRedone();
        super.redo();
        fireRedoHappen();
    }

    /**
    *
    * @param sheet
    */
    public void remove(ZSheet sheet) {
        boolean occur = false;

        for (int i = edits.size() - 1; i >= 0; i--) {
            ZCmdFormat cmd = (ZCmdFormat) edits.get(i);

            if (cmd.getSheet() == sheet) {
                trimEdits(i, i);
                occur = true;
            }
        }

        if (occur) {
            fireCommandListChanged();
        }
    }

    /**
    *
    * @param lst
    */
    public void removeListener(ZUndoManagerListener lst) {
        listeners.remove(lst);
    }

    /**
    *
    * @throws CannotUndoException
    */
    public synchronized void undo() throws CannotUndoException {
        currentCmd = (ZCommand) editToBeUndone();
        super.undo();
        fireUndoHappen();
    }

    /**
    */
    private void fireCommandJoined() {
        for (int i = 0; i < listeners.size(); i++) {
            ZUndoManagerListener lst = (ZUndoManagerListener) listeners.get(i);
            lst.commandJoined(this);
        }
    }

    /**
    */
    private void fireCommandListChanged() {
        for (int i = 0; i < listeners.size(); i++) {
            ZUndoManagerListener lst = (ZUndoManagerListener) listeners.get(i);
            lst.commandListChanged(this);
        }
    }

    /**
    */
    private void fireRedoHappen() {
        for (int i = 0; i < listeners.size(); i++) {
            ZUndoManagerListener lst = (ZUndoManagerListener) listeners.get(i);
            lst.redoHappen(this);
        }
    }

    /**
    */
    private void fireUndoHappen() {
        for (int i = 0; i < listeners.size(); i++) {
            ZUndoManagerListener lst = (ZUndoManagerListener) listeners.get(i);
            lst.undoHappen(this);
        }
    }
}