utils.java

基于JXTA开发平台的下载软件开发源代码

/*
 * File    : Utils.java
 * Created : 25 sept. 2003 16:15:07
 * By      : Olivier 
 * 
 * Azureus - a Java Bittorrent client
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details ( see the LICENSE file ).
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
 
package org.gudy.azureus2.ui.swt;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;

import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.dnd.*;
import org.eclipse.swt.events.ControlAdapter;
import org.eclipse.swt.events.ControlEvent;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.program.Program;
import org.eclipse.swt.widgets.*;
import org.gudy.azureus2.core3.config.COConfigurationManager;
import org.gudy.azureus2.core3.internat.MessageText;
import org.gudy.azureus2.core3.util.AERunnable;
import org.gudy.azureus2.core3.util.Constants;
import org.gudy.azureus2.core3.util.Debug;
import org.gudy.azureus2.ui.swt.mainwindow.Colors;
import org.gudy.azureus2.ui.swt.mainwindow.SWTThread;
import org.gudy.azureus2.ui.swt.views.utils.VerticalAligner;

/**
 * @author Olivier
 * 
 */
public class Utils {
	/** Some platforms expand the last column to fit the remaining width of
	 * the table.
	 */
	public static final boolean LAST_TABLECOLUMN_EXPANDS = Constants.isLinux;

  public static final boolean isGTK	= SWT.getPlatform().equals("gtk");

	private static final boolean DIRECT_SETCHECKED = !Constants.isOSX
			|| SWT.getVersion() >= 3212;
  
  public static void disposeComposite(Composite composite,boolean disposeSelf) {
    if(composite == null || composite.isDisposed())
      return;
  Control[] controls = composite.getChildren();
  for(int i = 0 ; i < controls.length ; i++) {
    Control control = controls[i];                
    if(control != null && ! control.isDisposed()) {
      if(control instanceof Composite) {
        disposeComposite((Composite) control,true);
      }
      try {
        control.dispose();
      } catch (SWTException e) {
        Debug.printStackTrace( e );
      }
    }
  }
  // It's possible that the composite was destroyed by the child
  if (!composite.isDisposed() && disposeSelf)
    try {
      composite.dispose();
    } catch (SWTException e) {
      Debug.printStackTrace( e );
    }
  }
  
  public static void disposeComposite(Composite composite) {
    disposeComposite(composite,true);
  }
  
  /**
   * Dispose of a list of SWT objects
   * 
   * @param disposeList
   */
  public static void disposeSWTObjects(List disposeList) {
  	boolean bResourceObjectExists = SWT.getVersion() >= 3129;
  	
		for (int i = 0; i < disposeList.size(); i++) {
			Object o = disposeList.get(i);
			if (o instanceof Widget && !((Widget) o).isDisposed())
				((Widget) o).dispose();
			else if (bResourceObjectExists && (o instanceof Resource)
					&& !((Resource) o).isDisposed())
				((Resource) o).dispose();
			else {
				try {
					// For Pre-SWT 3.1
					if ((o instanceof Cursor) && !((Cursor)o).isDisposed()) {
						((Cursor)o).dispose();
					} else if ((o instanceof Font) && !((Font)o).isDisposed()) {
						((Font)o).dispose();
					} else if ((o instanceof GC) && !((GC)o).isDisposed()) {
						((GC)o).dispose();
					} else if ((o instanceof Image) && !((Image)o).isDisposed()) {
						((Image)o).dispose();
					} else if ((o instanceof Region) && !((Region)o).isDisposed()) {
						((Region)o).dispose();  // 3.0
					} else if ((o instanceof TextLayout) && !((TextLayout)o).isDisposed()) {
						((TextLayout) o).dispose(); // 3.0
					}
				} catch (NoClassDefFoundError e) {
					// ignore
				}
				// Path, Pattern, Transform are all 3.1, which will be instances of 
				// Resource
			}
		}
		disposeList.clear();
  }
  
  /**
   * Initializes the URL dialog with http://
   * If a valid link is found in the clipboard, it will be inserted
   * and the size (and location) of the dialog is adjusted.
   * @param shell to set the dialog location if needed
   * @param gridData to adjust the dialog with
   * @param url the URL text control
   *
   * @author Rene Leonhardt
   */
  public static void 
  setTextLinkFromClipboard(
		  final Shell shell, final Text url, boolean accept_magnets ) {
    String link = getLinkFromClipboard(shell.getDisplay(),accept_magnets);
    if (link != null)
    	url.setText(link);
  }

  /**
   * <p>Gets an URL from the clipboard if a valid URL for downloading has been copied.</p>
   * <p>The supported protocols currently are http, https, and magnet.</p>
   * @param display
   * @return first valid link from clipboard, else "http://"
   */
  public static String 
  getLinkFromClipboard(
	 Display 	display,
	 boolean	accept_magnets ) 
  {
    final String[] prefixes = new String[] {"http://", "https://", "magnet:?", "magnet://?" };
    
    final Clipboard cb = new Clipboard(display);
    final TextTransfer transfer = TextTransfer.getInstance();
    
    String data = (String)cb.getContents(transfer);
    
    if (data != null) {
      data	= data.trim();
      for(int i = 0; i < (accept_magnets?prefixes.length:2 ); i++) {
        final int begin = data.indexOf(prefixes[i]);
        if (begin >= 0) {
          final int end = data.indexOf("\n", begin + prefixes[i].length());
          final String stringURL = (end >= 0) ? data.substring(begin, end - 1) : data.substring(begin);
          try {
            final URL parsedURL = new URL(stringURL);
            return parsedURL.toExternalForm();
          } catch (MalformedURLException e1) {
          }
        }
      }
    
      if ( accept_magnets && data.length() == 40 ){
    	  
    	  for (int i=0;i<data.length();i++){
    		  
    		  if ( "0123456789abcdefABCDEF".indexOf( data.charAt(i)) == -1 ){
    			  
    			  return( prefixes[0] );
    		  }
    	  }
    	  
    	  	// accept raw hash of 40 hex chars
    	  
    	  return( data );
      }
    }
    
    return prefixes[0];
  }

  public static void
  centreWindow(
  	Shell	shell )
  {
    Rectangle displayRect;
    try {
    	displayRect = shell.getMonitor().getClientArea();
    } catch (NoSuchMethodError e) {
      displayRect = shell.getDisplay().getClientArea();
    }

    Rectangle shellRect = shell.getBounds();
    if (shellRect.width > displayRect.width - 100)
    	shellRect.width = displayRect.width - 100;

    if (shellRect.height > displayRect.height - 64)
    	shellRect.height = displayRect.height - 100;
	
    shellRect.x = (displayRect.width - shellRect.width) / 2;
    shellRect.y = (displayRect.height - shellRect.height) / 2;

    shell.setBounds(shellRect);
  }

  /**
   * Centers a window relative to a control. That is to say, the window will be located at the center of the control.
   * @param window
   * @param control
   */
  public static void centerWindowRelativeTo(final Shell window, final Control control)
  {
      final Rectangle bounds = control.getBounds();
      final Point shellSize = window.getSize();
      window.setLocation(
              bounds.x + (bounds.width / 2) - shellSize.x / 2,
              bounds.y + (bounds.height / 2) - shellSize.y / 2
      );
  }

  /**
   * @param control the control (usually a Shell) to add the DropTarget
   * @param url the Text control where to set the link text
   *
   * @author Rene Leonhardt
   */
  public static void createURLDropTarget(final Control control, final Text url) {
    DropTarget dropTarget = new DropTarget(control, DND.DROP_DEFAULT | DND.DROP_MOVE | DND.DROP_COPY | DND.DROP_LINK);
    dropTarget.setTransfer(new Transfer[] { URLTransfer.getInstance()});
    dropTarget.addDropListener(new DropTargetAdapter() {
			public void dropAccept(DropTargetEvent event) {
				event.currentDataType = URLTransfer.pickBestType(event.dataTypes,
						event.currentDataType);
			}
      public void dragOver(DropTargetEvent event) {
      	if ((event.operations & DND.DROP_LINK) > 0)
      		event.detail = DND.DROP_LINK;
      	else if ((event.operations & DND.DROP_COPY) > 0)
      		event.detail = DND.DROP_COPY;
      }
      public void drop(DropTargetEvent event) {
        if (((URLTransfer.URLType)event.data).linkURL != null)
        	url.setText(((URLTransfer.URLType)event.data).linkURL);
      }
    });
  }

  /**
   * Force label to use more vertical space if wrapped and in a GridLayout
   * Place this listener on the _parent_ of the label
   * See Eclipse SWT Bug #9866 (GridLayout does not handle wrapped Label properly)
   * This workaround only works for labels who:
   *   - horizontally span their whole parent 
   *     (ie. the parent has 3 columns, the label must span 3 columns)
   *   - GridData style has GridData.FILL_HORIZONTAL
   *   - Label style has SWT.WRAP
   *
   * @author TuxPaper
   * @note Bug 9866 fixed in 3105 and later
   */
  public static class LabelWrapControlListener extends ControlAdapter{
  	public void controlResized(ControlEvent e){
  		if (SWT.getVersion() >= 3105)
  			return;
  	  Composite parent = (Composite)e.widget;
  	  Control children[] = parent.getChildren();

  	  if (children.length > 0) {
        GridLayout parentLayout = (GridLayout)parent.getLayout();
        if (parentLayout != null) {
    	    Point size;
          int marginWidth = parentLayout.marginWidth;
          
      	  Composite grandParent = parent.getParent();
      	  if (grandParent instanceof ScrolledComposite) {
      	    Composite greatGP = grandParent.getParent();
      	    if (greatGP != null) {
              size = greatGP.getSize();
  
              if (greatGP.getLayout() instanceof GridLayout) {
                marginWidth += ((GridLayout)greatGP.getLayout()).marginWidth;
              }
            } else {
              // not tested
              size = grandParent.getSize();
            }

            if (grandParent.getLayout() instanceof GridLayout) {
              marginWidth += ((GridLayout)grandParent.getLayout()).marginWidth;
            }

            ScrollBar sb = grandParent.getVerticalBar();
            if (sb != null) {
              // I don't know why, but we have to remove one
              size.x -= sb.getSize().x + 1;
            }
          } else
            size = parent.getSize();
         
          boolean oneChanged = false;
      	  for (int i = 0; i < children.length; i++) {
      	    if ((children[i] instanceof Label) &&
      	        (children[i].getStyle() & SWT.WRAP) == SWT.WRAP) {
      	      GridData gd = (GridData)children[i].getLayoutData();
      	      if (gd != null && 
      	          gd.horizontalAlignment == GridData.FILL) {
      	        if (gd.horizontalSpan == parentLayout.numColumns) {
        		      gd.widthHint = size.x - 2 * marginWidth;
        		      oneChanged = true;
        		    } else {
        		      Point pt = children[i].getLocation();
        		      gd.widthHint = size.x - pt.x - (2 * marginWidth);
        		      oneChanged = true;