/*******************************************************************************
 * Copyright (c) 2006, 2007 IBM Corporation and others.
 * 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jface.snippets.viewers;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.text.TextPresentation;
import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.ColumnPixelData;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.ITableColorProvider;
import org.eclipse.jface.viewers.ITableFontProvider;
import org.eclipse.jface.viewers.ITableLabelProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.StyleRangeLabelProvider;
import org.eclipse.jface.viewers.TableLayout;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StyleRange;
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.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.Text;

/**
 * A TableViewer using a StyleRangeLabelProvider to show some of the posibilities:
 * <ul>
 *   <li>placing the image provided by the label provider anywhere in the label</li>
 *   <li>multi-line labels (currently only by placing line breaks in the label)</li>
 *   <li>multi font labels</li>
 *   <li>multi colored labels</li>
 * </ul>
 * 
 * @author Michael Krkoska <michael.krkoska@gmail.com>
 */
public class Snippet042StyleRangeProviderFull {

   private static final String[] TEXT        = new String[] {
         "TextStyle defines a set of styles that can be\n" + 
         "applied to a range of text. The hashCode() method\n" +
         "in this class uses the values of the public fields to",
         "compute the hash value.\uFFFC When storing instances\n" + 
         "of the class in hashed collections do not modify\n" +
         "these fields after the object has been inserted.",
         "Application code does not need to explicitly\n" + 
         "release the resources managed and thus no\n" + 
         "dispose() method is provided.\uFFFC", };
   private static final Pattern  METHODS     = Pattern.compile("\\w+\\(\\)");
   private static final int      SHELL_WIDTH = 640;
   private static final Display  DISPLAY     = Display.getDefault();
   private static int            IMAGE_SIZE  = 16;
   private static final Image    IMAGE1      = new Image(DISPLAY, DISPLAY.getSystemImage(SWT.ICON_WARNING).getImageData().scaledTo(IMAGE_SIZE, IMAGE_SIZE));
   private static final Image    IMAGE2      = new Image(DISPLAY, DISPLAY.getSystemImage(SWT.ICON_ERROR).getImageData().scaledTo(IMAGE_SIZE, IMAGE_SIZE));


   public static void main( String[] args ) {

      Shell shell = new Shell(DISPLAY, SWT.CLOSE);
      shell.setSize(SHELL_WIDTH, 300);
      shell.setLayout(new GridLayout(2, false));

      Snippet042StyleRangeProviderFull example = new Snippet042StyleRangeProviderFull();
      example.createPartControl(shell);

      shell.open();

      while ( !shell.isDisposed() ) {
         if ( !DISPLAY.readAndDispatch() ) {
            DISPLAY.sleep();
         }
      }
      DISPLAY.dispose();
   }

   private TableViewer viewer;

   private Text        text;

   public Snippet042StyleRangeProviderFull() {
      int defaultSize = JFaceResources.getDefaultFontDescriptor().getFontData()[0].getHeight();
      JFaceResources.getFontRegistry().put("Courier", new FontData[] { new FontData("Courier New", defaultSize, SWT.NORMAL) });
      FontData[] fontData = JFaceResources.getFontRegistry().defaultFontDescriptor().getFontData();
      fontData[0].setHeight(fontData[0].getHeight() + 2);
      JFaceResources.getFontRegistry().put("BiggerDefault", fontData);
   }

   public void createPartControl( Composite parent ) {
      Label label = new Label(parent, SWT.NONE);
      label.setText("type something here:");

      text = new Text(parent, SWT.NONE);
      text.setText("hash");
      text.setSelection(0, 4);
      text.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
      text.addListener(SWT.Modify, new Listener() {

         public void handleEvent( Event event ) {
            viewer.refresh();
         }
      });

   	// SWT.FULL_SELECTION is needed on win32 as long as Bug 168807 exists
      viewer = new TableViewer(parent, SWT.FULL_SELECTION); 

      GridData data = new GridData(GridData.GRAB_HORIZONTAL | GridData.GRAB_VERTICAL | GridData.FILL_BOTH);
      data.horizontalSpan = 2;
      viewer.getControl().setLayoutData(data);

      viewer.setContentProvider(new ArrayContentProvider());
      createColumns();

      viewer.setLabelProvider(new MyStyleRangeLabelProvider(new MyLabelProvider()));

      StyleRangeLabelProvider.setUpOwnerDraw(viewer);
      viewer.setInput(TEXT);
   }

   private void createColumns() {
      TableLayout layout = new TableLayout();
      viewer.getTable().setLayout(layout);
      viewer.getTable().setHeaderVisible(true);
      viewer.getTable().setLinesVisible(true);

      int width = SHELL_WIDTH - 2 * 5 - viewer.getTable().getShell().computeTrim(0, 0, 0, 0).width;
      int width1 = width / 2;
      int width2 = width - width1;

      TableColumn tc = new TableColumn(viewer.getTable(), SWT.NONE);
      tc.setText("col1");
      layout.addColumnData(new ColumnPixelData(width1));

      tc = new TableColumn(viewer.getTable(), SWT.NONE);
      tc.setText("col2");
      layout.addColumnData(new ColumnPixelData(width2));
   }

   private final class MyLabelProvider extends LabelProvider implements ITableLabelProvider, ITableColorProvider, ITableFontProvider {

      public Color getBackground( Object element, int columnIndex ) {
         return null;
      }

      public Image getColumnImage( Object element, int columnIndex ) {
         return columnIndex == 0 ? IMAGE1 : IMAGE2;
      }

      public String getColumnText( Object element, int columnIndex ) {
         return element.toString();
      }

      public Font getFont( Object element, int columnIndex ) {
         if ( element == TEXT[(columnIndex + 2) % 3] ) {
            return JFaceResources.getFont("BiggerDefault");
         }
         return null;
      }

      public Color getForeground( Object element, int columnIndex ) {
         if ( element == TEXT[columnIndex + 1] ) {
            return DISPLAY.getSystemColor(SWT.COLOR_DARK_RED);
         }
         return null;
      }
   }

   private final class MyStyleRangeLabelProvider extends StyleRangeLabelProvider {

      private MyStyleRangeLabelProvider( ILabelProvider labelProvider ) {
         super(labelProvider);
      }

      public StyleRange[] getStyleRanges( Object element, int columnIndex, String label ) {
         String searchText = text.getText();
         TextPresentation tp = new TextPresentation();
         if ( searchText.length() > 0 ) {
            Color yellow = text.getDisplay().getSystemColor(SWT.COLOR_YELLOW);
            int index = -1;
            while ( (index = label.indexOf(searchText, index + 1)) >= 0 ) {
               StyleRange styleRange = new StyleRange(index, searchText.length(), null, yellow);
               tp.mergeStyleRange(styleRange);
            }
         }

         Font courier = JFaceResources.getFont("Courier");
         Matcher matcher = METHODS.matcher(label);
         while ( matcher.find() ) {
            StyleRange styleRange = new StyleRange(matcher.start(), matcher.end() - matcher.start(), null, null);
            styleRange.font = courier;
            tp.mergeStyleRange(styleRange);
         }

         List ranges = new ArrayList();
         for ( Iterator iterator = tp.getAllStyleRangeIterator(); iterator.hasNext(); ) {
            ranges.add(iterator.next());
         }
         return (StyleRange[])ranges.toArray(new StyleRange[ranges.size()]);
      }
   }

}