AboutDialog.java

package org.herac.tuxguitar.gui.help.about;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.TabFolder;
import org.eclipse.swt.widgets.TabItem;
import org.eclipse.swt.widgets.Text;
import org.herac.tuxguitar.gui.TuxGuitar;
import org.herac.tuxguitar.gui.editors.TGPainter;
import org.herac.tuxguitar.gui.system.config.TGConfigKeys;
import org.herac.tuxguitar.gui.util.DialogUtils;
import org.herac.tuxguitar.util.TGVersion;

public class AboutDialog {

  private static final int IMAGE_HEIGHT = 100;
  private static final int IMAGE_WIDTH = 100;

  private static final String PROPERTY_PREFIX = ("help.about.");
  private static final String RELEASE_NAME = (TuxGuitar.APPLICATION_NAME + " " + TGVersion.CURRENT);

  private static final int TAB_ITEM_HEIGHT = 300;
  private static final int TAB_ITEM_WIDTH = 660;

  protected Image image;
  protected Composite imageComposite;

  public AboutDialog() {
    super();
  }

  private GridData getButtonData() {
    GridData data = new GridData(SWT.FILL, SWT.FILL, true, true);
    data.minimumWidth = 80;
    data.minimumHeight = 25;
    return data;
  }

  private void makeTabItem(TabFolder tabFolder, String itemName, String itemText) {
    Composite control = new Composite(tabFolder, SWT.NONE);
    control.setLayout(new GridLayout());
    control.setLayoutData(new FormData(TAB_ITEM_WIDTH, TAB_ITEM_HEIGHT));

    Text text = new Text(control, SWT.BORDER | SWT.MULTI | SWT.WRAP
        | SWT.V_SCROLL);
    text.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
    text.setBackground(TuxGuitar.instance().getDisplay().getSystemColor(
        SWT.COLOR_WHITE));
    text.setEditable(false);
    text.append(itemText);
    text.setSelection(0);

    TabItem tabItem = new TabItem(tabFolder, SWT.NONE);
    tabItem.setText(TuxGuitar.getProperty(PROPERTY_PREFIX + itemName));
    tabItem.setControl(control);
  }

  public void open(Shell shell) {
    final Shell dialog = DialogUtils.newDialog(shell, SWT.DIALOG_TRIM
        | SWT.APPLICATION_MODAL);
    dialog.setLayout(new GridLayout());
    dialog.setText(TuxGuitar.getProperty("help.about"));

    // --------------------HEADER----------------------------------
    Composite header = new Composite(dialog, SWT.NONE);
    header.setLayout(new GridLayout(2, false));
    header.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

    this.image = TuxGuitar.instance().getIconManager().getAboutDescription();

    this.imageComposite = new Composite(header, SWT.NONE);
    this.imageComposite.setLayoutData(new GridData(IMAGE_WIDTH, IMAGE_HEIGHT));
    this.imageComposite.addPaintListener(new PaintListener() {
      public void paintControl(PaintEvent e) {
        Rectangle bounds = AboutDialog.this.image.getBounds();
        TGPainter painter = new TGPainter(e.gc);
        painter.drawImage(AboutDialog.this.image,
            ((IMAGE_WIDTH - bounds.width) / 2),
            ((IMAGE_HEIGHT - bounds.height) / 2));
      }
    });

    final Font titleFont = new Font(dialog.getDisplay(), TuxGuitar.instance()
        .getConfig().getFontDataConfigValue(
            TGConfigKeys.FONT_ABOUT_DIALOG_TITLE));
    Label title = new Label(header, SWT.NONE);
    title.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, true));
    title.setFont(titleFont);
    title.setForeground(dialog.getDisplay().getSystemColor(SWT.COLOR_GRAY));
    title.setText(RELEASE_NAME);
    title.addDisposeListener(new DisposeListener() {
      public void widgetDisposed(DisposeEvent e) {
        titleFont.dispose();
      }
    });

    // -------------------TABS-----------------------
    Composite tabs = new Composite(dialog, SWT.NONE);
    tabs.setLayout(new GridLayout());
    tabs.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

    final TabFolder tabFolder = new TabFolder(tabs, SWT.NONE);
    tabFolder.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
    tabFolder.setLayout(new FormLayout());

    AboutContentReader docReader = new AboutContentReader();

    makeTabItem(tabFolder, AboutContentReader.DESCRIPTION, docReader.read(
        AboutContentReader.DESCRIPTION).toString());
    makeTabItem(tabFolder, AboutContentReader.AUTHORS, docReader.read(
        AboutContentReader.AUTHORS).toString());
    makeTabItem(tabFolder, AboutContentReader.LICENSE, docReader.read(
        AboutContentReader.LICENSE).toString());

    tabFolder.addSelectionListener(new SelectionAdapter() {
      @Override
      public void widgetSelected(SelectionEvent e) {
        if (tabFolder.getSelectionIndex() == 0) {
          AboutDialog.this.image = TuxGuitar.instance().getIconManager()
              .getAboutDescription();
        } else if (tabFolder.getSelectionIndex() == 1) {
          AboutDialog.this.image = TuxGuitar.instance().getIconManager()
              .getAboutAuthors();
        } else if (tabFolder.getSelectionIndex() == 2) {
          AboutDialog.this.image = TuxGuitar.instance().getIconManager()
              .getAboutLicense();
        }
        AboutDialog.this.imageComposite.redraw();
      }
    });

    // ------------------BUTTONS--------------------------
    Composite buttons = new Composite(dialog, SWT.NONE);
    buttons.setLayout(new GridLayout());
    buttons.setLayoutData(new GridData(SWT.END, SWT.FILL, true, true));

    Button buttonClose = new Button(buttons, SWT.PUSH);
    buttonClose.setLayoutData(getButtonData());
    buttonClose.setText(TuxGuitar.getProperty("close"));
    buttonClose.addSelectionListener(new SelectionAdapter() {
      @Override
      public void widgetSelected(SelectionEvent arg0) {
        dialog.dispose();
      }
    });

    tabFolder.setSelection(0);

    dialog.setDefaultButton(buttonClose);

    DialogUtils.openDialog(dialog, DialogUtils.OPEN_STYLE_CENTER
        | DialogUtils.OPEN_STYLE_PACK);
  }
}