next.i.view.widgets.XPicker.java Source code

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Here is the source code for next.i.view.widgets.XPicker.java

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/*
 * Copyright 2011 Vancouver Ywebb Consulting 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 next.i.view.widgets;

import next.i.XStyle;

import com.google.gwt.dom.client.Element;
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.Event;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.ListBox;

/**
 * Provides a picker user-interface (a picker wheel, drop down menu or a
 * selection list depending on the OS) which has a series of items (rows) at
 * indexed locations on the widget.
 * 
 * <p>
 * <img class='ai' src='../../../../resources/XPicker.png' />
 * </p>
 */
public class XPicker extends Composite
        implements FocusHandler, BlurHandler, ChangeHandler, HasValueChangeHandlers<String> {

    private ListBox _listBox = new ListBox();
    private FlowPanel _panel = new FlowPanel();
    private HTML jqPicker;

    public XPicker() {
        initWidget(_panel);

        jqPicker = new HTML("<div class='body'><div>&nbsp;</div><div class='icon'></div></div>");
        FlowPanel xbtn = new FlowPanel();
        xbtn.setStyleName("xbtn");
        _panel.add(xbtn);

        xbtn.add(jqPicker);
        xbtn.add(_listBox);

        sinkEvents(Event.ONCLICK | Event.ONTOUCHCANCEL | Event.ONTOUCHEND | Event.ONTOUCHMOVE | Event.ONTOUCHSTART);

        setStyleName(XStyle.xpicker.name());
        _listBox.addFocusHandler(this);
        _listBox.addBlurHandler(this);
        _listBox.addChangeHandler(this);
    }

    @Override
    public void onBrowserEvent(Event e) {
        e.stopPropagation();
        super.onBrowserEvent(e);
    }

    @Override
    protected void onUnload() {
        removeStyleName(XStyle.selected.name());
        super.onUnload();
    }

    @Override
    public void onFocus(FocusEvent event) {
        addStyleName(XStyle.selected.name());
    }

    @Override
    public void onBlur(BlurEvent event) {
        removeStyleName(XStyle.selected.name());
    }

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

    private void setTextItem_(String item) {
        Element el = (Element) jqPicker.getElement().getFirstChild().getFirstChild();
        el.setInnerHTML(item);
    }

    public void add(String item, boolean isSelected) {
        add(item, item, isSelected);
    }

    public void add(String item) {
        add(item, false);
    }

    public void add(String item, String value) {
        add(item, value, false);
    }

    public void add(String item, String value, boolean isSelected) {
        _listBox.addItem(item, value);
        if (isSelected) {
            setTextItem_(item);
            getListBox().setSelectedIndex(_listBox.getItemCount() - 1);
        }
    }

    // @Override
    // public void add(Widget w) {
    // assert w.getClass() == DropDownItem.class :
    // "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());
    }

}