org.bonitasoft.console.client.view.NavigationLinkWidget.java Source code

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Here is the source code for org.bonitasoft.console.client.view.NavigationLinkWidget.java

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/**
 * Copyright (C) 2010 BonitaSoft S.A.
 * BonitaSoft, 31 rue Gustave Eiffel - 38000 Grenoble
 * This program 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 2.0 of the License, or
 * (at your option) any later version.
 *
 * This program 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 org.bonitasoft.console.client.view;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.user.client.History;
import com.google.gwt.user.client.ui.DecoratorPanel;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.Image;

/**
 * @author Nicolas Chabanoles
 * 
 */
public class NavigationLinkWidget extends BonitaPanel implements ValueChangeHandler<String> {

    private static final String SELECTED_SUFFIX_STYLE = "selected";

    // Create the layout.
    private final DecoratorPanel myOuterPanel = new DecoratorPanel();
    private final FlowPanel myInnerPanel = new FlowPanel();

    private final String myHitoryTokenValue;

    /**
     * 
     * Default constructor.
     * 
     * @param aLabel
     * @param selected
     */
    public NavigationLinkWidget(final String anIconCSSStyle, final String aLabel, final String aHitoryTokenValue) {
        super();
        myHitoryTokenValue = aHitoryTokenValue;

        // Create the widgets.
        final Image theIcon = new Image(PICTURE_PLACE_HOLDER);
        if (anIconCSSStyle != null) {
            theIcon.setStyleName(anIconCSSStyle);
        }

        final HTML theLink = new HTML(aLabel);

        // Set the click handlers.
        if (aHitoryTokenValue != null) {
            // Create the handler for the dynamic part of the widget.
            final ClickHandler theClickHandler = new ClickHandler() {
                public void onClick(ClickEvent aArg0) {
                    History.newItem(aHitoryTokenValue);
                }
            };
            theLink.addClickHandler(theClickHandler);
            theIcon.addClickHandler(theClickHandler);
        }
        // Finally layout widgets.
        myInnerPanel.add(theIcon);
        myInnerPanel.add(theLink);

        // Wrap the inner panel into a decorated panel to allow rounded corner
        // design creation.
        myOuterPanel.setWidget(myInnerPanel);
        myOuterPanel.setStylePrimaryName("bos_navigation_link");
        this.initWidget(myOuterPanel);

        // Manage web browser history.
        History.addValueChangeHandler(this);
        final String theToken = History.getToken();
        setSelected(theToken != null && theToken.equals(aHitoryTokenValue));
    }

    /**
     * Defines whether the label is selected or not.
     * 
     * @param isSelected
     */
    public void setSelected(boolean isSelected) {
        // Associate a css class name.
        if (isSelected) {
            myOuterPanel.addStyleDependentName(SELECTED_SUFFIX_STYLE);
        } else {
            myOuterPanel.removeStyleDependentName(SELECTED_SUFFIX_STYLE);
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * com.google.gwt.event.logical.shared.ValueChangeHandler#onValueChange(com
     * .google.gwt.event.logical.shared.ValueChangeEvent)
     */
    public void onValueChange(ValueChangeEvent<String> aEvent) {
        // History token has changed.
        setSelected((aEvent.getValue() != null && aEvent.getValue().equals(myHitoryTokenValue)));
    }
}