cc.alcina.framework.gwt.client.stdlayout.MainCmpBase.java Source code

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Here is the source code for cc.alcina.framework.gwt.client.stdlayout.MainCmpBase.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.stdlayout;

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

import com.google.gwt.event.logical.shared.BeforeSelectionEvent;
import com.google.gwt.event.logical.shared.BeforeSelectionHandler;
import com.google.gwt.event.logical.shared.SelectionEvent;
import com.google.gwt.event.logical.shared.SelectionHandler;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.History;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.IsWidget;

import cc.alcina.framework.gwt.client.widget.BaseTab;

/**
 * 
 * @author Nick Reddel
 */
public abstract class MainCmpBase extends Composite
        implements BeforeSelectionHandler<Integer>, SelectionHandler<Integer>, ValueChangeHandler<String> {
    protected MainTabPanel tabPanel;

    protected ArrayList<IsWidget> buttons;

    protected Class<BaseTab> currentTabClass;

    protected List<BaseTab> tabs;

    private HandlerRegistration historyHandlerRegistration;

    public MainCmpBase() {
        initButtons();
        this.tabPanel = createTabPanel();
        tabPanel.setStyleName("mainTabPanel");
        tabPanel.getDeckPanel().setStyleName("alcina-MainContent");
        tabPanel.addBeforeSelectionHandler(this);
        tabPanel.addSelectionHandler(this);
        this.resetTabs();
        initWidget(tabPanel);
    }

    public MainTabPanel getTabPanel() {
        return this.tabPanel;
    }

    public List<BaseTab> getTabs() {
        return this.tabs;
    }

    public void onBeforeSelection(BeforeSelectionEvent<Integer> event) {
        // no cancel
    }

    @SuppressWarnings("unchecked")
    public void onSelection(SelectionEvent<Integer> event) {
        Integer tabIndex = event.getSelectedItem();
        this.currentTabClass = (Class<BaseTab>) tabPanel.getWidget(tabIndex).getClass();
        afterTabSelect(tabIndex);
    }

    public abstract void resetTabs();

    public boolean showTab(String tabToken) {
        for (BaseTab tab : tabs) {
            if (tab.getHistoryToken().equals(tabToken)) {
                int index = tabPanel.getWidgetIndex(tab);
                if (index == -1) {
                    return false;
                } else {
                    tabPanel.selectTab(index);
                    return true;
                }
            }
        }
        return false;
    }

    protected abstract void afterTabSelect(int tabIndex);

    protected MainTabPanel createTabPanel() {
        return new MainTabPanel(buttons);
    }

    protected abstract void initButtons();

    @Override
    protected void onAttach() {
        this.historyHandlerRegistration = History.addValueChangeHandler(this);
        super.onAttach();
    }

    @Override
    protected void onDetach() {
        historyHandlerRegistration.removeHandler();
        super.onDetach();
    }
}