htmltreenode.java

一个使用struts+hibernate+spring开发的完的网站源代码。

/*
 * Copyright 2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.myfaces.custom.tree;

import org.apache.myfaces.custom.tree.model.TreeModel;
import org.apache.myfaces.custom.tree.model.TreePath;

import javax.faces.component.html.HtmlCommandLink;
import javax.faces.context.FacesContext;
import java.util.Iterator;
import java.util.List;


/**
 * Represents a single node of a three. A custom html link component representing the expand/collapse icon
 * is held as a facet named <code>expandCollapse</code>.
 *
 * @author <a href="mailto:[e-mail]">Oliver Rossmueller</a>
 * @version $Revision: 1.12 $ $Date: 2004/11/26 12:46:38 $
 *
 *          $Log: HtmlTreeNode.java,v $
 *          Revision 1.12  2004/11/26 12:46:38  oros
 *          cleanup: removed unused iconChild attribute
 *
 *          Revision 1.11  2004/11/26 12:14:10  oros
 *          MYFACES-8: applied tree table patch by David Le Strat
 *
 */
public class HtmlTreeNode
    extends HtmlCommandLink
{

    private static final String DEFAULT_RENDERER_TYPE = "org.apache.myfaces.HtmlTreeNode";

    public static final String COMPONENT_TYPE = "org.apache.myfaces.HtmlTreeNode";
    public static final String EXPAND_COLLAPSE_FACET = "expandCollapse";

    public static final int OPEN = 0;
    public static final int OPEN_FIRST = 1;
    public static final int OPEN_LAST = 2;
    public static final int OPEN_SINGLE = 3;
    public static final int CLOSED = 10;
    public static final int CLOSED_FIRST = 11;
    public static final int CLOSED_LAST = 12;
    public static final int CLOSED_SINGLE = 13;
    public static final int CHILD = 20;
    public static final int CHILD_FIRST = 21;
    public static final int CHILD_LAST = 22;
    public static final int LINE = 30;
    public static final int EMPTY = 40;
    private static final int OFFSET = 10;
    private static final int MOD_FIRST = 1;
    private static final int MOD_LAST = 2;

    private transient TreePath path;
    private int[] translatedPath;
    private transient Object userObject;
    private boolean expanded = false;
    private boolean selected = false;
    private int[] layout;


    public HtmlTreeNode()
    {
        setRendererType(DEFAULT_RENDERER_TYPE);
    }


    public int getLevel()
    {
        return layout.length - 1;
    }


    public int getMaxChildLevel()
    {
        if (getChildCount() == 0)
        {
            return getLevel();
        }

        int max = getLevel();
        for (Iterator iterator = getChildren().iterator(); iterator.hasNext();)
        {
            HtmlTreeNode child = (HtmlTreeNode) iterator.next();
            max = Math.max(max, child.getMaxChildLevel());
        }
        return max;
    }


    public TreePath getPath()
    {
        if (path == null)
        {
            if (translatedPath == null)
            {
                throw new IllegalStateException("No path and no translated path available");
            }
            path = translatePath(translatedPath, getTreeModel(FacesContext.getCurrentInstance()));
        }
        return path;
    }


    public void setPath(TreePath path)
    {
        this.path = path;
    }


    int[] getTranslatedPath()
    {
        if (translatedPath != null)
        {
            return translatedPath;
        }
        ;
        return translatePath(getPath(), getTreeModel(FacesContext.getCurrentInstance()));
    }


    public Object getUserObject()
    {
        if (userObject == null)
        {
            userObject = getPath().getLastPathComponent();
        }
        return userObject;
    }


    public void setUserObject(Object userObject)
    {
        this.userObject = userObject;
        setValue(userObject.toString());
    }


    public boolean isExpanded()
    {
        return expanded;
    }


    void childrenAdded(int[] children, FacesContext context)
    {
        if (getChildCount() == 0 && children.length > 0)
        {
            // change to CLOSED_*
            layout[layout.length - 1] -= OFFSET;
        }

        if (!expanded)
        {
            // nothing to do
            return;
        }

        TreeModel model = getTreeModel(context);
        int childCount = model.getChildCount(getUserObject());
        int pathUpdateIndex = getTranslatedPath().length;

        for (int i = 0; i < children.length; i++)
        {
            int index = children[i];
            translateChildrenPath(pathUpdateIndex, index, 1);
            Object userObject = model.getChild(getUserObject(), index);
            addNode(model, userObject, index, childCount, context);
        }
    }


    void childrenChanged(int[] children, FacesContext context)
    {
        if (!expanded)
        {
            // nothing to do
            return;
        }

        TreeModel model = getTreeModel(context);

        for (int i = 0; i < children.length; i++)
        {
            int index = children[i];
            Object userObject = model.getChild(getUserObject(), index);
            HtmlTreeNode node = (HtmlTreeNode) getChildren().get(index);
            node.setUserObject(userObject);
            // todo: modify path????
        }
    }


    private void addNode(TreeModel model, Object userObject, int index, int childCount, FacesContext context)
    {
        HtmlTreeNode node = createNode(model, userObject, childCount, index, context);
        List children = getChildren();

        if (!children.isEmpty())
        {
            if (index == 0)
            {
                HtmlTreeNode first = (HtmlTreeNode) getChildren().get(0);
                int[] layout = first.getLayout();
                if (layout[layout.length - 1] % OFFSET == MOD_FIRST)
                {
                    // change from *_FIRST to *
                    layout[layout.length - 1]--;
                }
            } else if (index == childCount - 1)
            {
                HtmlTreeNode last = (HtmlTreeNode) getChildren().get(childCount - 2);
                int[] layout = last.getLayout();
                if (layout[layout.length - 1] % OFFSET == MOD_LAST)
                {
                    // change from *_LAST to *
                    layout[layout.length - 1] -= 2;
                }
            }
        }

        children.add(index, node);
    }


    void childrenRemoved(int[] children)
    {
        if (!expanded)
        {
            // nothing to do
            return;
        }
        List childNodes = getChildren();
        int pathUpdateIndex = getTranslatedPath().length;

        for (int i = children.length - 1; i >= 0; i--)
        {
            translateChildrenPath(pathUpdateIndex, children[i], -1);
            HtmlTreeNode child = (HtmlTreeNode) childNodes.get(children[i]);

            if (child.isSelected()) {
                child.setSelected(false);
                if (children[i] < childNodes.size() - 1) {
                    ((HtmlTreeNode) childNodes.get(children[i] + 1)).setSelected(true);
                } else {
                    if (children[i] > 0) {
                        ((HtmlTreeNode) childNodes.get(children[i] - 1)).setSelected(true);
                    } else {
                        setSelected(true);
                    }
                }
            }
            childNodes.remove(children[i]);
        }
    }


    /**
     * Update the translatedPath of all child nodes so the path points to the same object in the model
     * after adding/removing a node
     *
     * @param pathUpdateIndex
     * @param startIndex
     * @param offset
     */
    private void translateChildrenPath(int pathUpdateIndex, int startIndex, int offset) {
        List children = getChildren();
        int childrenSize = children.size();

        for (int i = startIndex; i < childrenSize; i++) {
            HtmlTreeNode node = (HtmlTreeNode) children.get(i);
            node.updateTranslatedPath(pathUpdateIndex, offset);
        }
    }


    private void updateTranslatedPath(int pathUpdateIndex, int offset)
    {
        translatedPath[pathUpdateIndex] += offset;
        // reset path and userObject so the values are acquired from the model
        path = null;
        userObject = null;

        if (isExpanded()) {
            // continue with the children of this node