cc.alcina.framework.gwt.client.widget.ToggleLink.java Source code

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Here is the source code for cc.alcina.framework.gwt.client.widget.ToggleLink.java

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/*
 * 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 cc.alcina.framework.gwt.client.widget;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.logical.shared.HasSelectionHandlers;
import com.google.gwt.event.logical.shared.SelectionEvent;
import com.google.gwt.event.logical.shared.SelectionHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.FlowPanel;

/**
 *
 * @author Nick Reddel
 */
public class ToggleLink extends Composite implements HasSelectionHandlers<Integer>, ClickHandler {
    private FlowPanel fp;

    private Link link1;

    private Link link2;

    private int selectedIndex;

    public ToggleLink(String state1, String state2, SelectionHandler<Integer> handler) {
        this(state1, state2, handler, 0);
    }

    public ToggleLink(String state1, String state2, SelectionHandler<Integer> handler, int initialIndex) {
        this.fp = new FlowPanel();
        this.link1 = new Link(state1, this);
        this.link2 = new Link(state2, this);
        fp.add(link1);
        fp.add(link2);
        setSelectedIndex(initialIndex);
        addSelectionHandler(handler);
        initWidget(fp);
    }

    public void addButtonStyleName(String style) {
        link1.addStyleName(style);
        link2.addStyleName(style);
    }

    public HandlerRegistration addSelectionHandler(SelectionHandler<Integer> handler) {
        return addHandler(handler, SelectionEvent.getType());
    }

    public int getSelectedIndex() {
        return this.selectedIndex;
    }

    public void onClick(ClickEvent event) {
        setSelectedIndex(Math.abs((event.getSource() == link1 ? 0 : 1) - 1));
        SelectionEvent.fire(this, selectedIndex);
    }

    public void setSelectedIndex(int selectedIndex) {
        this.selectedIndex = selectedIndex;
        updateVisibility();
    }

    private void updateVisibility() {
        link1.setVisible(selectedIndex == 0);
        link2.setVisible(selectedIndex == 1);
    }
}