com.gwtm.ui.client.widgets.DropDownList.java Source code

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Here is the source code for com.gwtm.ui.client.widgets.DropDownList.java

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/*
 * Copyright (c) 2011 Zhihua (Dennis) Jiang
 * 
 * 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 com.gwtm.ui.client.widgets;

import com.google.gwt.event.dom.client.BlurEvent;
import com.google.gwt.event.dom.client.BlurHandler;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.dom.client.FocusEvent;
import com.google.gwt.event.dom.client.FocusHandler;
import com.google.gwt.event.logical.shared.HasValueChangeHandlers;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.ui.HTMLPanel;
import com.google.gwt.user.client.ui.ListBox;
import com.google.gwt.user.client.ui.Widget;
import com.gwtm.ui.client.core.Utils;
import com.gwtm.ui.client.core.widgets.CssFactory.BoxAlign;
import com.gwtm.ui.client.core.widgets.CssFactory.BoxOrient;
import com.gwtm.ui.client.core.widgets.CssFactory.BoxPack;

public class DropDownList extends BoxPanel
        implements FocusHandler, BlurHandler, ChangeHandler, HasValueChangeHandlers<String> {

    ListBox _listBox = new ListBox();

    public DropDownList() {
        super(BoxOrient.vertical, BoxPack.start, BoxAlign.center);
        super.add(_listBox);
        _listBox.setStylePrimaryName("gwtm-inputbox");
        if (!Utils.DeviceInfo.isIOS()) {
            super.add(new HTMLPanel(""));
            super.add(new HTMLPanel(""));
            super.add(new HTMLPanel(""));
        }
        setStyleName("gwtm-DropDownList");
        _listBox.addFocusHandler(this);
        _listBox.addBlurHandler(this);
        _listBox.addChangeHandler(this);
    }

    @Override
    protected void onUnload() {
        removeStyleName("Focus");
        super.onUnload();
    }

    @Override
    public void onFocus(FocusEvent event) {
        addStyleName("Focus");
    }

    @Override
    public void onBlur(BlurEvent event) {
        removeStyleName("Focus");
    }

    @Override
    public void onChange(ChangeEvent event) {
        int index = _listBox.getSelectedIndex();
        String value = _listBox.getValue(index);
        ValueChangeEvent.fire(this, value);
    }

    @Override
    public void add(Widget w) {
        assert w instanceof DropDownItem : "Can only contain DropDownItem in DropDownList.";
        DropDownItem item = (DropDownItem) w;
        _listBox.addItem(item.getText(), item.getValue());
    }

    public String getSelectedText() {
        int index = _listBox.getSelectedIndex();
        if (index >= 0) {
            return _listBox.getItemText(index);
        } else {
            return null;
        }
    }

    public String getSelectedValue() {
        int index = _listBox.getSelectedIndex();
        if (index >= 0) {
            return _listBox.getValue(index);
        } else {
            return null;
        }
    }

    public ListBox getListBox() {
        return _listBox;
    }

    @Override
    public HandlerRegistration addValueChangeHandler(ValueChangeHandler<String> handler) {
        return this.addHandler(handler, ValueChangeEvent.getType());
    }

}