org.eclipse.scout.sdk.ui/src/org/eclipse/scout/sdk/ui/internal/view/outline/ViewLabelProvider.java

/*******************************************************************************
 * Copyright (c) 2010 BSI Business Systems Integration AG.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     BSI Business Systems Integration AG - initial API and implementation
 ******************************************************************************/
package org.eclipse.scout.sdk.ui.internal.view.outline;

import org.eclipse.jface.viewers.IColorProvider;
import org.eclipse.jface.viewers.IFontProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.scout.sdk.ui.internal.ScoutSdkUi;
import org.eclipse.scout.sdk.ui.view.outline.pages.AbstractPage;
import org.eclipse.scout.sdk.ui.view.outline.pages.IPage;
import org.eclipse.scout.sdk.ui.view.outline.pages.IPageFilter;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.ISharedImages;
import org.eclipse.ui.PlatformUI;

public class ViewLabelProvider extends LabelProvider implements IColorProvider, IFontProvider {

  private Composite m_parent;
  private Font m_fontPlain;// always null
  private Font m_fontPlainItalic;
  private Font m_fontBold;
  private Font m_fontBoldItalic;
  private final ScoutExplorerPart m_explorerPart;

  public ViewLabelProvider(Composite parent, ScoutExplorerPart explorerPart) {
    m_parent = parent;
    m_explorerPart = explorerPart;
  }

  @Override
  public String getText(Object obj) {
    if (obj instanceof IPage) {
      IPage p = (IPage) obj;
      IPageFilter filter = m_explorerPart.getPageFilter(p);
      if (filter == null || filter.isEmpty()) {
        return p.getName();
      }
      else {
        return p.getName() + " [" + filter.getFilterExpression() + "]";
      }
    }
    else {
      return obj.toString();
    }
  }

  @Override
  public Image getImage(Object obj) {
    if (obj instanceof AbstractPage) {
      AbstractPage m = (AbstractPage) obj;
      return m.getImage();
    }
    else {
      return PlatformUI.getWorkbench().getSharedImages().getImage(ISharedImages.IMG_OBJ_ELEMENT);
    }
  }

  @Override
  public Color getBackground(Object element) {
    return null;
  }

  @Override
  public Color getForeground(Object element) {
    // if(element instanceof AbstractPage){
    // return ((AbstractPage)element).getTextColor();
    // }
    return null;
  }

  @Override
  public Font getFont(Object element) {
    ensureFontCache();
    if (element instanceof IPage) {
      IPage p = (IPage) element;
      IPageFilter filter = m_explorerPart.getPageFilter(p);
      if (p.isFolder()) {
        if (filter == null || filter.isEmpty()) {
          return m_fontPlain;
        }
        else {
          return m_fontPlainItalic;
        }
      }
      else {
        if (filter == null || filter.isEmpty()) {
          return m_fontBold;
        }
        else {
          return m_fontBoldItalic;
        }
      }
    }
    return null;
  }

  private void ensureFontCache() {
    if (m_fontBold == null || m_fontBoldItalic == null || m_fontPlainItalic == null) {
      try {
        Font f = m_parent.getFont();
        if (f != null) {
          FontData[] d = f.getFontData();
          if (d != null && d.length > 0) {
            if (m_fontBold == null) {
              m_fontBold = new Font(f.getDevice(), d[0].getName(), d[0].getHeight(), SWT.BOLD);
            }
            if (m_fontBoldItalic == null) {
              m_fontBoldItalic = new Font(f.getDevice(), d[0].getName(), d[0].getHeight(), SWT.BOLD | SWT.ITALIC);
            }
            if (m_fontPlainItalic == null) {
              m_fontPlainItalic = new Font(f.getDevice(), d[0].getName(), d[0].getHeight(), SWT.ITALIC);
            }
          }
        }
      }
      catch (Throwable t) {
        ScoutSdkUi.logWarning(t);
      }
    }
  }
}