com.allen_sauer.gwt.dnd.demo.client.ui.MultiRowTabPanel.java Source code

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Here is the source code for com.allen_sauer.gwt.dnd.demo.client.ui.MultiRowTabPanel.java

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/*
 * Copyright 2009 Fred Sauer
 *
 * 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 com.allen_sauer.gwt.dnd.demo.client.ui;

import com.google.gwt.event.logical.shared.SelectionEvent;
import com.google.gwt.event.logical.shared.SelectionHandler;
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.Random;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.DeckPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.TabBar;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;

import java.util.HashMap;

public class MultiRowTabPanel extends Composite {

    private static final String CSS_DEMO_MULTI_ROW_TAB_PANEL_BOTTOM = "demo-MultiRowTabPanel-bottom";

    private static final String CSS_DEMO_MULTI_ROW_TAB_PANEL_ROW = "demo-MultiRowTabPanel-row";

    private MultiRowTabHistoryTokens historyTokenMap = new MultiRowTabHistoryTokens();

    private DeckPanel masterDeckPanel;

    private int rows = 0;

    private int selectedRow = -1;

    private HashMap<TabBar, Integer> tabBarIndexOffsetMap = new HashMap<TabBar, Integer>();

    private StylableVerticalPanel tabBarsVerticalPanel;

    private int tabCount;

    private final int tabsPerRow;

    public MultiRowTabPanel(int tabsPerRow) {
        this.tabsPerRow = tabsPerRow;
        VerticalPanel containerPanel = new VerticalPanel();
        initWidget(containerPanel);

        tabBarsVerticalPanel = new StylableVerticalPanel();
        tabBarsVerticalPanel.setWidth("100%");
        masterDeckPanel = new DeckPanel();
        masterDeckPanel.addStyleName(CSS_DEMO_MULTI_ROW_TAB_PANEL_BOTTOM);
        containerPanel.add(tabBarsVerticalPanel);
        containerPanel.add(masterDeckPanel);
        History.addValueChangeHandler(new ValueChangeHandler<String>() {
            @Override
            public void onValueChange(ValueChangeEvent<String> event) {
                selectTabByHistoryToken(event.getValue());
            }
        });
    }

    public void add(Widget widget, Label tabLabel, String historyToken, String pageTitle) {
        int row = tabCount / tabsPerRow;
        while (row >= rows) {
            addRow();
        }
        tabCount++;
        masterDeckPanel.add(widget);
        TabBar tabBar = (TabBar) tabBarsVerticalPanel.getWidget(row);
        tabBar.addTab(tabLabel);
        historyTokenMap.add(historyToken, pageTitle);
    }

    public void addTabBarStyleName(String style) {
        tabBarsVerticalPanel.addStyleName(style);
    }

    public int getTabCount() {
        return tabCount;
    }

    public void selectTab(int index) {
        int row = index / tabsPerRow;
        int tabIndex = index % tabsPerRow;
        TabBar tabBar = (TabBar) tabBarsVerticalPanel.getWidget(row);
        tabBar.selectTab(tabIndex);
    }

    public void selectTabByHistoryToken(String historyToken) {
        if ("IndexedPanelExample".equals(historyToken)) {
            historyToken = "InsertPanelExample";
        }
        Integer tabIndex = historyTokenMap.getIndex(historyToken);
        if (tabIndex == null) {
            // select a random example
            tabIndex = Random.nextInt(getTabCount() - 1);
        }
        selectTab(tabIndex);
    }

    private void addRow() {
        TabBar tabBar = new TabBar();
        tabBarsVerticalPanel.add(tabBar);
        tabBar.addSelectionHandler(new SelectionHandler<Integer>() {
            @Override
            public void onSelection(SelectionEvent<Integer> event) {
                int row = tabBarsVerticalPanel.getWidgetIndex((TabBar) event.getSource());
                whenTabSelected(row, event.getSelectedItem());
            }
        });
        tabBarIndexOffsetMap.put(tabBar, Integer.valueOf(tabCount));
        tabBarsVerticalPanel.setCellStyleName(tabBar, CSS_DEMO_MULTI_ROW_TAB_PANEL_ROW);

        rows++;
    }

    private void whenTabSelected(int row, int tabIndex) {
        if (tabIndex == -1) {
            return;
        }
        if (row != selectedRow) {
            selectedRow = row;
            for (int i = 0; i < rows; i++) {
                if (i != row) {
                    TabBar tabBar = (TabBar) tabBarsVerticalPanel.getWidget(i);
                    tabBar.selectTab(-1);
                }
            }
        }
        TabBar tabBar = (TabBar) tabBarsVerticalPanel.getWidget(selectedRow);
        Integer widgetOffset = tabBarIndexOffsetMap.get(tabBar);
        int index = widgetOffset.intValue() + tabIndex;
        masterDeckPanel.showWidget(index);
        History.newItem(historyTokenMap.getHistoryToken(index));
        Window.setTitle(historyTokenMap.getPageTitle(historyTokenMap.getHistoryToken(index)));
    }
}