org.rstudio.studio.client.common.presentation.SlideNavigationPresenter.java Source code

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Here is the source code for org.rstudio.studio.client.common.presentation.SlideNavigationPresenter.java

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/*
 * SlideNavigationPresenter.java
 *
 * Copyright (C) 2009-12 by RStudio, Inc.
 *
 * Unless you have received this program directly from RStudio pursuant
 * to the terms of a commercial license agreement with RStudio, then
 * this program is licensed to you under the terms of version 3 of the
 * GNU Affero General Public License. This program is distributed WITHOUT
 * ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING THOSE OF NON-INFRINGEMENT,
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Please refer to the
 * AGPL (http://www.gnu.org/licenses/agpl-3.0.txt) for more details.
 *
 */

package org.rstudio.studio.client.common.presentation;

import org.rstudio.studio.client.common.presentation.events.SlideIndexChangedEvent;
import org.rstudio.studio.client.common.presentation.events.SlideNavigationChangedEvent;
import org.rstudio.studio.client.common.presentation.model.SlideNavigation;
import org.rstudio.studio.client.common.presentation.model.SlideNavigationItem;

import com.google.gwt.core.client.JsArray;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.ui.MenuItem;

public class SlideNavigationPresenter
        implements SlideNavigationChangedEvent.Handler, SlideIndexChangedEvent.Handler {
    public interface Display {
        void navigate(int index);

        void editCurrentSlide();

        SlideNavigationMenu getNavigationMenu();

        HandlerRegistration addSlideNavigationChangedHandler(SlideNavigationChangedEvent.Handler handler);

        HandlerRegistration addSlideIndexChangedHandler(SlideIndexChangedEvent.Handler handler);
    }

    public SlideNavigationPresenter(Display view) {
        view_ = view;

        view_.addSlideNavigationChangedHandler(this);
        view_.addSlideIndexChangedHandler(this);

        view_.getNavigationMenu().getHomeButton().addClickHandler(new ClickHandler() {
            @Override
            public void onClick(ClickEvent event) {
                view_.navigate(0);
            }
        });

        view_.getNavigationMenu().getEditButton().addClickHandler(new ClickHandler() {
            @Override
            public void onClick(ClickEvent event) {
                view_.editCurrentSlide();
            }
        });
    }

    @Override
    public void onSlideNavigationChanged(SlideNavigationChangedEvent event) {
        slideNavigation_ = event.getNavigation();

        SlideNavigationMenu navigationMenu = view_.getNavigationMenu();
        navigationMenu.clear();

        if (slideNavigation_ != null) {
            JsArray<SlideNavigationItem> items = slideNavigation_.getItems();
            for (int i = 0; i < items.length(); i++) {
                // get slide
                final SlideNavigationItem item = items.get(i);

                // build html
                SafeHtmlBuilder menuHtml = new SafeHtmlBuilder();
                for (int j = 0; j < item.getIndent(); j++)
                    menuHtml.appendHtmlConstant("&nbsp;&nbsp;&nbsp;");
                menuHtml.appendEscaped(item.getTitle());

                navigationMenu.addItem(new MenuItem(menuHtml.toSafeHtml(), new Command() {
                    @Override
                    public void execute() {
                        view_.navigate(item.getIndex());
                    }
                }));
            }

            navigationMenu.setVisible(true);

            navigationMenu.setDropDownVisible(slideNavigation_.getItems().length() > 1);
        } else {
            navigationMenu.setVisible(false);
        }

    }

    @Override
    public void onSlideIndexChanged(SlideIndexChangedEvent event) {
        // find the first navigation item that is <= to the index
        int index = event.getIndex();
        if (slideNavigation_ != null) {
            JsArray<SlideNavigationItem> items = slideNavigation_.getItems();
            for (int i = (items.length() - 1); i >= 0; i--) {
                if (items.get(i).getIndex() <= index) {
                    String caption = items.get(i).getTitle();
                    caption += " (" + (index + 1) + "/" + slideNavigation_.getTotalSlides() + ")";

                    view_.getNavigationMenu().setCaption(caption);
                    break;
                }
            }
        }

    }

    private final Display view_;
    private SlideNavigation slideNavigation_ = null;
}