AbstractAjaxTabbedPanel.java

package de.flower.common.ui.ajax.markup.html.tab;

import de.flower.common.ui.panel.BasePanel;
import org.apache.wicket.Page;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.extensions.ajax.markup.html.tabs.AjaxTabbedPanel;
import org.apache.wicket.extensions.markup.html.tabs.ITab;
import org.apache.wicket.model.IModel;

import java.util.ArrayList;
import java.util.List;

/**
 * @author flowerrrr
 */
public abstract class AbstractAjaxTabbedPanel<T> extends BasePanel<T> {

    /**
     * Goes into url so keep it small.
     */
    public static final String TAB_INDEX_KEY = "tab";

    private AjaxTabbedPanel tabbedPanel;

    public AbstractAjaxTabbedPanel() {
        this(null);
    }

    public AbstractAjaxTabbedPanel(final IModel<T> model) {
        super(model);
        // create a list of ITab objects used to feed the tabbed panel
        List<ITab> tabs = new ArrayList<ITab>();
        addTabs(tabs);
        tabbedPanel = new AjaxTabbedPanel("tabs", tabs) {
            @Override
            protected void onAjaxUpdate(final AjaxRequestTarget target) {
                AbstractAjaxTabbedPanel.this.onAjaxUpdate(target, getSelectedTab());
            }
        };
        add(tabbedPanel);
    }

    @Override
    protected void onInitialize() {
        super.onInitialize();
        selectActiveTab();
    }

    /**
     * Cannot be called in constructor cause page is not available then.
     */
    private void selectActiveTab() {
        Page page = findPage();
        if (page != null) {
            int index = page.getPageParameters().get(TAB_INDEX_KEY).toInt(0);
            if (index >= 0 && index < tabbedPanel.getTabs().size()) {
                tabbedPanel.setSelectedTab(index);
            }
        }
    }

    public int getSelectedTab() {
        return tabbedPanel.getSelectedTab();
    }

    /**
     * Must be implementing classes to add their panels to the tab-list.
     */
    protected abstract void addTabs(List<ITab> tabs);

    /**
     * See AjaxTabbedPanel#onAjaxUpdate().
     * @param target
     */
    protected void onAjaxUpdate(final AjaxRequestTarget target, int selectedTab) {
    }
}