com.dawg6.gwt.client.widgets.SearchableComboBox.java Source code

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Here is the source code for com.dawg6.gwt.client.widgets.SearchableComboBox.java

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/*******************************************************************************
 * Copyright (c) 2014, 2015 Scott Clarke (scott@dawg6.com).
 *
 * This file is part of Dawg6's Common GWT Libary.
 *
 * Dawg6's Common GWT Libary is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Dawg6's Common GWT Libary is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *******************************************************************************/
package com.dawg6.gwt.client.widgets;

import java.util.List;

import com.dawg6.common.data.objects.PersistentObject;
import com.dawg6.gwt.common.util.ObservableListInterface.ListChangedHandler;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.logical.shared.SelectionEvent;
import com.google.gwt.event.logical.shared.SelectionHandler;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.MultiWordSuggestOracle;
import com.google.gwt.user.client.ui.SuggestBox;
import com.google.gwt.user.client.ui.SuggestOracle.Suggestion;
import com.google.gwt.user.client.ui.VerticalPanel;

public class SearchableComboBox<T extends PersistentObject> extends Composite {

    protected SuggestBox textField;
    protected MultiWordSuggestOracle oracle;
    protected ComboBox<T> comboBox;

    public SearchableComboBox(ComboBox<T> comboBox) {

        VerticalPanel panel = new VerticalPanel();
        initWidget(panel);

        this.comboBox = comboBox;
        this.oracle = new MultiWordSuggestOracle();
        this.textField = new SuggestBox(oracle);

        panel.add(textField);
        panel.add(comboBox);

        comboBox.setWidth("100%");

        comboBox.addObserver(new ListChangedHandler<T>() {

            @Override
            public void listChanged(List<T> list) {
                setSuggestions(list);
            }
        });

        textField.addSelectionHandler(new SelectionHandler<Suggestion>() {

            @Override
            public void onSelection(SelectionEvent<Suggestion> event) {
                suggestionSelected(event);
            }
        });
    }

    protected void setSuggestions(List<T> list) {
        oracle.clear();

        for (T t : list) {
            String display = comboBox.getDisplayText(t);
            oracle.add(display);
        }
    }

    protected void suggestionSelected(SelectionEvent<Suggestion> event) {
        String value = event.getSelectedItem().getReplacementString();

        comboBox.setValue(value);
    }

    public void refresh() {
        comboBox.refresh();
    }

    public T getValue() {
        return comboBox.getValue();
    }

    public void setValue(Long id) {
        comboBox.setValue(id);
    }

    public void setValue(T value) {
        comboBox.setValue(value);
    }

    public void setVisibleItemCount(int i) {
        comboBox.setVisibleItemCount(i);

        if (i > 1)
            comboBox.setHeight("100%");
    }

    public void addChangeHandler(ChangeHandler changeHandler) {
        comboBox.addChangeHandler(changeHandler);
    }

    public int getSelectedIndex() {
        return comboBox.getSelectedIndex();
    }

    public void removeItem(int i) {
        comboBox.removeItem(i);
    }

    public void insertItem(T value, int i) {
        comboBox.insertItem(value, i);
    }

    public void setSelectedIndex(int i) {
        comboBox.setSelectedIndex(i);
    }

    public int getItemCount() {
        return comboBox.getItemCount();
    }

    public T getItem(int i) {
        return comboBox.getItem(i);
    }

    public void addItem(T item) {
        comboBox.addItem(item);
    }

    public void clear() {
        comboBox.clear();
    }

    public void addAll(List<T> items) {
        comboBox.addAll(items);
    }
}