fi.jasoft.draganddrop.DemoUI.java Source code

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Here is the source code for fi.jasoft.draganddrop.DemoUI.java

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/*
 * Copyright 2014 John Ahlroos
 *
 * 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 fi.jasoft.draganddrop;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringReader;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.List;

import org.vaadin.johan.Toolbox;
import org.vaadin.johan.Toolbox.ORIENTATION;

import com.vaadin.annotations.Theme;
import com.vaadin.navigator.Navigator;
import com.vaadin.server.VaadinRequest;
import com.vaadin.shared.ui.label.ContentMode;
import com.vaadin.ui.Alignment;
import com.vaadin.ui.HorizontalLayout;
import com.vaadin.ui.Label;
import com.vaadin.ui.MenuBar;
import com.vaadin.ui.MenuBar.Command;
import com.vaadin.ui.MenuBar.MenuItem;
import com.vaadin.ui.Panel;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;
import com.vaadin.ui.themes.ValoTheme;

import de.java2html.converter.JavaSource2HTMLConverter;
import de.java2html.javasource.JavaSource;
import de.java2html.javasource.JavaSourceParser;
import de.java2html.options.JavaSourceConversionOptions;
import de.java2html.util.IllegalConfigurationException;
import fi.jasoft.draganddrop.demos.BookshelfDemo;
import fi.jasoft.draganddrop.demos.DragDemo;
import fi.jasoft.draganddrop.demos.ListDemo;

@Theme("Demo")
public class DemoUI extends UI {

    private List<DemoView> views = new ArrayList<>();
    {
        views.add(new DragDemo());
        views.add(new ListDemo());
        views.add(new BookshelfDemo());
    }

    private Label codeLabel = new Label("No source available.", ContentMode.HTML);

    private Navigator navigator;

    @Override
    protected void init(VaadinRequest request) {

        Panel showcase = new Panel();
        showcase.setSizeUndefined();

        navigator = new Navigator(this, showcase);

        for (DemoView view : views) {
            navigator.addView(view.getViewPath(), view);
        }

        // default
        openView(views.get(0));

        MenuBar demos = new MenuBar();
        demos.setStyleName(ValoTheme.MENUBAR_BORDERLESS);

        for (final DemoView view : views) {
            demos.addItem(view.getViewCaption(), new Command() {

                @Override
                public void menuSelected(MenuItem selectedItem) {
                    openView(view);
                }
            });
        }

        VerticalLayout root = new VerticalLayout(demos, showcase);
        root.setSizeFull();
        root.setExpandRatio(showcase, 1);
        root.setComponentAlignment(showcase, Alignment.MIDDLE_CENTER);
        setContent(root);

        HorizontalLayout sourceWrapperLayout = new HorizontalLayout();
        Label caption = new Label("Source code for example");
        caption.setStyleName("source-caption");
        sourceWrapperLayout.addComponent(caption);

        Panel sourceWrapper = new Panel(codeLabel);
        sourceWrapper.setStyleName(ValoTheme.PANEL_BORDERLESS);
        sourceWrapper.setHeight(getPage().getBrowserWindowHeight() + "px");
        sourceWrapperLayout.addComponent(sourceWrapper);
        sourceWrapperLayout.setExpandRatio(sourceWrapper, 1);

        Toolbox sourceBox = new Toolbox();
        sourceBox.setOrientation(ORIENTATION.RIGHT_CENTER);
        sourceBox.setContent(sourceWrapperLayout);
        sourceBox.setOverflowSize(30);
        root.addComponent(sourceBox);
    }

    private void openView(DemoView view) {
        navigator.navigateTo(view.getViewPath());
        codeLabel.setValue(getSourceCodeFromFile(view.getClass()));
    }

    private static String getSourceCodeFromFile(Class clazz) {
        String file = clazz.getCanonicalName().replaceAll("\\.", "/") + ".java";
        InputStream inputStream = DemoUI.class.getClassLoader().getResourceAsStream(file);
        if (inputStream == null) {
            return "";
        }

        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));

        StringBuilder snippet = new StringBuilder();
        String line;
        boolean includeLine = false;
        try {
            while ((line = reader.readLine()) != null) {
                if (line.contains("source-start")) {
                    includeLine = true;
                } else if (line.contains("source-end")) {
                    includeLine = false;
                } else if (includeLine) {
                    snippet.append(line);
                    snippet.append("\n");
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return getFormattedSourceCode(snippet.toString());
    }

    private static String getFormattedSourceCode(String sourceCode) {
        try {

            JavaSource source = new JavaSourceParser().parse(new StringReader(sourceCode));
            JavaSource2HTMLConverter converter = new JavaSource2HTMLConverter();
            StringWriter writer = new StringWriter();

            JavaSourceConversionOptions options = JavaSourceConversionOptions.getDefault();
            options.setShowLineNumbers(true);
            options.setAddLineAnchors(false);
            converter.convert(source, options, writer);
            return writer.toString();
        } catch (IllegalConfigurationException exception) {
            return sourceCode;
        } catch (IOException exception) {
            return sourceCode;
        }
    }
}