org.jboss.errai.widgets.client.WSTree.java Source code

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Here is the source code for org.jboss.errai.widgets.client.WSTree.java

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/*
 * Copyright 2010 JBoss, a divison Red Hat, Inc
 *
 * 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.jboss.errai.widgets.client;

import com.google.gwt.event.dom.client.*;
import com.google.gwt.user.client.ui.*;

import java.util.HashMap;
import java.util.Map;

public class WSTree extends Composite {
    private Tree tree;
    private long last;

    private TreeItem lastItem;
    private long threshold = 400;

    private Map<TreeItem, ClickHandler> clickListeners = new HashMap<TreeItem, ClickHandler>();

    public WSTree() {
        tree = new Tree();
        tree.setAnimationEnabled(true);

        /**
         * Add the mouse listener to handle double-click.
         */
        tree.addMouseDownHandler(new MouseDownHandler() {
            public void onMouseDown(MouseDownEvent event) {
                long elapsed = System.currentTimeMillis() - last;
                if (!getUserAgent().contains("msie")) {
                    last = System.currentTimeMillis();
                    TreeItem fti = tree.getSelectedItem();

                    if (fti != null && fti.equals(lastItem) && elapsed < threshold) {
                        if (fti.getChildCount() > 0) {
                            if (!fti.getState()) {
                                fti.setState(true, true);
                            } else {
                                fti.setState(false, false);
                            }
                        } else {
                            clickListeners.get(fti).onClick(null);
                        }
                        last = 0;
                    }
                }
            }
        });

        tree.addMouseOutHandler(new MouseOutHandler() {
            public void onMouseOut(MouseOutEvent event) {
                lastItem = null;
            }
        });

        tree.addMouseUpHandler(new MouseUpHandler() {
            public void onMouseUp(MouseUpEvent event) {
                long elapsed = System.currentTimeMillis() - last;

                TreeItem fti = tree.getSelectedItem();

                if (getUserAgent().contains("msie")) {
                    last = System.currentTimeMillis();

                    if (fti != null && elapsed < threshold && lastItem != null
                            && fti.hashCode() == lastItem.hashCode()) {
                        if (fti.getChildCount() > 0) {
                            if (!fti.getState()) {
                                fti.setState(true, true);
                            } else {
                                fti.setState(false, false);
                            }
                        } else {
                            clickListeners.get(fti).onClick(null);
                        }
                        lastItem = null;
                    } else {
                        lastItem = fti;
                    }
                } else {
                    lastItem = fti;
                }
            }
        });

        initWidget(tree);
    }

    public Tree getTree() {
        return tree;
    }

    public void setTree(Tree tree) {
        this.tree = tree;
    }

    public WSTree addSubTree() {
        WSTree gTree = new WSTree();
        tree.addItem(gTree);
        return gTree;
    }

    public WSTreeItem addItem(Image icon, Widget content) {
        HorizontalPanel hPanel = new HorizontalPanel();
        hPanel.add(icon);
        hPanel.add(content);

        hPanel.setCellWidth(icon, "16px");

        WSTreeItem item = new WSTreeItem(hPanel);
        tree.addItem(item);
        return item;
    }

    public void addItem(WSTreeItem item) {
        item.getElement().getStyle().setProperty("marginTop", "1px");
        item.getElement().getStyle().setProperty("userSelect", "none");
        tree.addItem(item);
    }

    public void attachListener(WSTreeItem item, ClickHandler handler) {
        if (handler != null)
            clickListeners.put(item, handler);
    }

    public static native String getUserAgent() /*-{
                                               return navigator.userAgent.toLowerCase();
                                               }-*/;
}