com.google.sampling.experiential.client.ListChoicesPanel.java Source code

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Here is the source code for com.google.sampling.experiential.client.ListChoicesPanel.java

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/*
* Copyright 2011 Google Inc. All Rights Reserved.
* 
* 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.
*/
// Copyright 2010 Google Inc. All Rights Reserved.

package com.google.sampling.experiential.client;

import java.util.LinkedList;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.ui.CheckBox;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.paco.shared.model.InputDAO;

/**
 * A collection of all the ListChoicePanels to define the choices for a given
 * Input object whose responsetype is List.
 *
 * @author Bob Evans
 *
 */
public class ListChoicesPanel extends Composite {

    private InputDAO input;
    private VerticalPanel mainPanel;
    private LinkedList<ListChoicePanel> choicePanelsList;

    /**
     * @param input
     */
    public ListChoicesPanel(final InputDAO input) {
        this.input = input;
        mainPanel = new VerticalPanel();
        mainPanel.setSpacing(2);
        initWidget(mainPanel);

        final CheckBox multiselect = new CheckBox("Multiple selections");
        multiselect.setValue(input.getMultiselect());
        multiselect.addClickHandler(new ClickHandler() {

            @Override
            public void onClick(ClickEvent event) {
                input.setMultiselect(multiselect.getValue());
            }

        });
        mainPanel.add(multiselect);

        Label lblSignalTimes = new Label("List Choice (s)");
        lblSignalTimes.setStyleName("gwt-Label-Header");
        mainPanel.add(lblSignalTimes);

        choicePanelsList = new LinkedList<ListChoicePanel>();
        String[] choices = input.getListChoices();
        if (choices == null || choices.length == 0) {
            ListChoicePanel choicePanel = new ListChoicePanel(this);
            String choice = choicePanel.getChoice();
            choices = new String[] { choice };
            mainPanel.add(choicePanel);
            choicePanelsList.add(choicePanel);
            input.setListChoices(choices);
        } else {
            for (int i = 0; i < choices.length; i++) {
                ListChoicePanel choicePanel = new ListChoicePanel(this);
                choicePanel.setChoice(choices[i]);
                mainPanel.add(choicePanel);
                choicePanelsList.add(choicePanel);
            }
        }
    }

    public void deleteChoice(ListChoicePanel choicePanel) {
        if (choicePanelsList.size() == 1) {
            return;
        }
        choicePanelsList.remove(choicePanel);
        mainPanel.remove(choicePanel);
        updateChoices();
    }

    public void addChoice(ListChoicePanel choicePanel) {
        int index = choicePanelsList.indexOf(choicePanel);

        ListChoicePanel choicePanel2 = new ListChoicePanel(this);
        choicePanelsList.add(index + 1, choicePanel2);

        int widgetIndex = mainPanel.getWidgetIndex(choicePanel);
        mainPanel.insert(choicePanel2, widgetIndex + 1);

        updateChoices();

    }

    // TODO this is not very efficient.
    private void updateChoices() {
        String[] newTimes = new String[choicePanelsList.size()];
        for (int i = 0; i < choicePanelsList.size(); i++) {
            newTimes[i] = choicePanelsList.get(i).getChoice();
        }
        input.setListChoices(newTimes);
    }

    public void updateChoice(ListChoicePanel choicePanel) {
        int index = choicePanelsList.indexOf(choicePanel);
        input.getListChoices()[index] = choicePanel.getChoice();
    }

    public ListChoicePanel getFirstChoicePanel() {
        return getChoicePanel(0);
    }

    private ListChoicePanel getChoicePanel(int index) {
        return choicePanelsList.get(index);
    }

}