org.onesocialweb.gwt.client.ui.widget.ListSelector.java Source code

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Here is the source code for org.onesocialweb.gwt.client.ui.widget.ListSelector.java

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/*
 *  Copyright 2010 Vodafone Group Services Ltd.
 *
 *  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.onesocialweb.gwt.client.ui.widget;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import org.onesocialweb.gwt.client.task.DefaultTaskInfo;
import org.onesocialweb.gwt.client.task.TaskMonitor;
import org.onesocialweb.gwt.client.task.TaskInfo.Status;
import org.onesocialweb.gwt.service.OswService;
import org.onesocialweb.gwt.service.OswServiceFactory;
import org.onesocialweb.gwt.service.RequestCallback;
import org.onesocialweb.gwt.service.RosterItem;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.CheckBox;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.TextBox;

public class ListSelector extends FlowPanel {

    private StyledFlowPanel wrapper = new StyledFlowPanel("wrapper");

    private final RosterItem rosterItem;
    private List<String> listed = null;

    public ListSelector(final RosterItem rosterItem) {

        this.rosterItem = rosterItem;

        addStyleName("listselector");
        StyledFlowPanel buttons = new StyledFlowPanel("buttons");
        add(wrapper);
        add(buttons);

        final TextBox input = new TextBox();
        Button add = new Button("Create new list");
        buttons.add(input);
        buttons.add(add);

        // get all available lists for your complete roster
        OswService service = OswServiceFactory.getService();
        Set<String> groups = service.getRoster().getGroups();

        // try to get all the lists this person is on
        try {
            listed = rosterItem.getGroups();
        } catch (NullPointerException e) {
            listed = new ArrayList<String>();
        }

        // add all lists as checkboxes
        if (groups.size() > 0) {
            for (String list : groups) {
                if (list != null)
                    addCheckbox(list, false);
            }
        }

        add.addClickHandler(new ClickHandler() {

            public void onClick(ClickEvent event) {
                // add a new option to the list and check it
                addCheckbox(input.getText(), true);
                // empty the input field
                input.setText("");
            }
        });

    }

    public void addCheckbox(String list, Boolean value) {

        final CheckBox checkbox = new CheckBox(list);
        StyledFlowPanel fix = new StyledFlowPanel("fix");
        checkbox.addStyleName("checkbox");

        // manage checks and unchecks
        checkbox.addValueChangeHandler(new ValueChangeHandler<Boolean>() {

            @Override
            public void onValueChange(ValueChangeEvent<Boolean> event) {

                // is the item is checked?
                if (event.getValue() == true && !listed.contains(checkbox.getText()) && checkbox.getText() != null
                        && checkbox.getText().length() != 0) {
                    // set the values
                    listed.add(checkbox.getText());
                    rosterItem.setGroups(listed);
                    // disable during processing
                    checkbox.setEnabled(false);

                    // show task
                    final DefaultTaskInfo task = new DefaultTaskInfo("Adding person to the list", false);
                    TaskMonitor.getInstance().addTask(task);

                    // save new state
                    rosterItem.save(new RequestCallback<RosterItem>() {

                        @Override
                        public void onFailure() {
                            // return to original state and notify user
                            checkbox.setEnabled(true);
                            checkbox.setValue(true);
                            task.complete("Could not add person to list.", Status.failure);
                        }

                        @Override
                        public void onSuccess(RosterItem result) {
                            // enable the checkbox again
                            checkbox.setEnabled(true);
                            task.complete("", Status.succes);
                        }

                    });
                } else if (event.getValue() == false && listed.contains(checkbox.getText())) {
                    // set the values
                    listed.remove(checkbox.getText());
                    rosterItem.setGroups(listed);
                    // disable during processing
                    checkbox.setEnabled(false);

                    // show task
                    final DefaultTaskInfo task = new DefaultTaskInfo("Removing person from the list", false);
                    TaskMonitor.getInstance().addTask(task);

                    // save new state
                    rosterItem.save(new RequestCallback<RosterItem>() {

                        @Override
                        public void onFailure() {
                            // return to original state and notify user
                            checkbox.setEnabled(true);
                            checkbox.setValue(true);
                            task.complete("Could not remove person from the list.", Status.failure);
                        }

                        @Override
                        public void onSuccess(RosterItem result) {
                            // enable the checkbox again
                            checkbox.setEnabled(true);
                            task.complete("", Status.succes);
                        }

                    });
                }
            }

        });

        // if this person is already on the list make sure the checkbox is
        // checked
        if (listed != null && list.length() > 0 && listed.contains(list)) {
            checkbox.setValue(true);
        } else if (value == true) {
            // if a new checkbox is added automatically check it and fire a
            // change event
            checkbox.setValue(true);
            checkbox.fireEvent(new ValueChangeEvent<Boolean>(true) {
            });
        }
        if (checkbox.getText() != null && checkbox.getText().length() != 0) {
            wrapper.add(checkbox);
            wrapper.add(fix);
        }

    }
}