utils.java

基于JXTA开发平台的下载软件开发源代码

        		    }
      		    }
      		  }
      		}
      		if (oneChanged) {
      		  parent.layout(true);
        	  if (grandParent instanceof ScrolledComposite) {
        	    ((ScrolledComposite)grandParent).setMinSize(parent.computeSize(SWT.DEFAULT, SWT.DEFAULT, true));
        	  }
          }
      	}
    	} // size
  	} // controlResized
  } // class

  public static void alternateRowBackground(TableItem item) {
  	// On linux, table lines are actually alternating background colors
  	if (Constants.isLinux) {
  		if (!item.getParent().getLinesVisible())
  			item.getParent().setLinesVisible(true);
  		return;
  	}

  	if (item == null || item.isDisposed())
  		return;
  	Color[] colors = { item.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND),
        Colors.colorAltRow };
  	Color newColor = colors[ item.getParent().indexOf(item) % colors.length];
  	if (!item.getBackground().equals(newColor)) {
  		item.setBackground(newColor);
  	}
  }

  public static void alternateTableBackground(Table table) {
  	if (table == null || table.isDisposed())
  		return;

  	// On linux, table lines are actually alternating background colors
  	if (Constants.isLinux) {
  		if (!table.getLinesVisible())
  			table.setLinesVisible(true);
  		return;
  	}

  	int iTopIndex = table.getTopIndex();
  	int iBottomIndex = getTableBottomIndex(table, iTopIndex);

  	Color[] colors = { table.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND),
        Colors.colorAltRow };
  	int iFixedIndex = iTopIndex;
    for (int i = iTopIndex; i <= iBottomIndex; i++) {
      TableItem row = table.getItem(i);
      // Rows can be disposed!
      if (!row.isDisposed()) {
      	Color newColor = colors[iFixedIndex % colors.length];
      	iFixedIndex++;
      	if (!row.getBackground().equals(newColor)) {
//        System.out.println("setting "+rows[i].getBackground() +" to " + newColor);
      		row.setBackground(newColor);
      	}
      }
    }
  }

  /**
   * <p>
   * Set a MenuItem's image with the given ImageRepository key. In compliance with platform
   * human interface guidelines, the images are not set under Mac OS X.
   * </p>
   * @param item SWT MenuItem
   * @param repoKey ImageRepository image key
   * @see <a href="http://developer.apple.com/documentation/UserExperience/Conceptual/OSXHIGuidelines/XHIGMenus/chapter_7_section_3.html#//apple_ref/doc/uid/TP30000356/TPXREF116">Apple HIG</a>
   */
  public static void setMenuItemImage(final MenuItem item, final String repoKey)
  {
      if(!Constants.isOSX)
          item.setImage(ImageRepository.getImage(repoKey));
  }

  public static void setMenuItemImage(final MenuItem item, final Image image)
  {
      if(!Constants.isOSX)
          item.setImage(image);
  }
  /**
   * Sets the shell's Icon(s) to the default Azureus icon.  OSX doesn't require
   * an icon, so they are skipped
   * 
   * @param shell
   */
  public static void setShellIcon(Shell shell) {
		final String[] sImageNames = { "azureus", "azureus32", "azureus64",
				"azureus128" };

		if (Constants.isOSX)
			return;

		try {
			ArrayList list = new ArrayList();
			Image[] images = new Image[] { ImageRepository.getImage("azureus"),
					ImageRepository.getImage("azureus32"),
					ImageRepository.getImage("azureus64"),
					ImageRepository.getImage("azureus128") };

			for (int i = 0; i < images.length; i++) {
				Image image = ImageRepository.getImage(sImageNames[i]);
				if (image != null)
					list.add(image);
			}

			if (list.size() == 0)
				return;

			shell.setImages((Image[]) list.toArray(new Image[0]));
		} catch (NoSuchMethodError e) {
			// SWT < 3.0
			Image image = ImageRepository.getImage(sImageNames[0]);
			if (image != null)
				shell.setImage(image);
		}
	}

  /**
   * Execute code in the Runnable object using SWT's thread.  If current
   * thread it already SWT's thread, the code will run immediately.  If the
   * current thread is not SWT's, code will be run either synchronously or 
   * asynchronously on SWT's thread at the next reasonable opportunity.
   * 
   * This method does not catch any exceptions.
   * 
   * @param code code to run
   * @param async true if SWT asyncExec, false if SWT syncExec
   * @return success
   */
  public static boolean execSWTThread(Runnable code,
			boolean async) {
    SWTThread swt = SWTThread.getInstance();
    
    if (swt == null) {
    	System.err.println("SWT Thread not started yet");
    	return false;
    }
    
    Display display = swt.getDisplay();

  	if (display == null || display.isDisposed())
			return false;

		if (display.getThread() == Thread.currentThread())
			code.run();
		else if (async)
			display.asyncExec(code);
		else
			display.syncExec(code);

		return true;
	}

  /**
   * Execute code in the Runnable object using SWT's thread.  If current
   * thread it already SWT's thread, the code will run immediately.  If the
   * current thread is not SWT's, code will be run asynchronously on SWT's 
   * thread at the next reasonable opportunity.
   * 
   * This method does not catch any exceptions.
   * 
   * @param code code to run
   * @return success
   */
	public static boolean execSWTThread(Runnable code) {
		return execSWTThread(code, true);
	}
	
	public static boolean isThisThreadSWT() {
    SWTThread swt = SWTThread.getInstance();
    
    if (swt == null) {
    	System.err.println("SWT Thread not started yet");
    	return false;
    }

    Display display = swt.getDisplay();

  	if (display == null || display.isDisposed())
			return false;

		return (display.getThread() == Thread.currentThread());
	}

	/** Open a messagebox using resource keys for title/text
	 * 
	 * @param parent Parent shell for messagebox
	 * @param style SWT styles for messagebox
	 * @param keyPrefix message bundle key prefix used to get title and text.  
	 *         Title will be keyPrefix + ".title", and text will be set to
	 *         keyPrefix + ".text"
	 * @param textParams any parameters for text
	 * 
	 * @return what the messagebox returns
	 */
	public static int openMessageBox(Shell parent, int style, String keyPrefix,
			String[] textParams) {
		MessageBox mb = new MessageBox(parent, style);
		mb.setMessage(MessageText.getString(keyPrefix + ".text", textParams));
		mb.setText(MessageText.getString(keyPrefix + ".title"));
		return mb.open();
	}

	/** Open a messagebox with actual title and text
	 * 
	 * @param parent
	 * @param style
	 * @param title
	 * @param text
	 * @return
	 */ 
	public static int openMessageBox(Shell parent, int style, String title,
			String text) {
		MessageBox mb = new MessageBox(parent, style);
		mb.setMessage(text);
		mb.setText(title);
		return mb.open();
	}
	
	/**
	 * Bottom Index may be negative
	 */ 
	public static int getTableBottomIndex(Table table, int iTopIndex) {
		// getItemHeight is slow on Linux, use getItem/getClientArea
		// getItem(Point) is slow on OSX
		
		if (!table.isVisible())
			return -1;
		
		if (Constants.isOSX)
			return Math.min(iTopIndex
					+ ((table.getClientArea().height - table.getHeaderHeight() - 1) / 
							table.getItemHeight()), table.getItemCount() - 1);

		// getItem will return null if clientArea's height is smaller than
		// header height.
		int areaHeight = table.getClientArea().height;
		if (areaHeight <= table.getHeaderHeight())
			return -1;

		// 2 offset to be on the safe side
		TableItem bottomItem = table.getItem(new Point(2,
				table.getClientArea().height - 1));
  	int iBottomIndex = (bottomItem != null) ? table.indexOf(bottomItem) :
			table.getItemCount() - 1;
  	return iBottomIndex;
	}
	
	public static void
	openURL(
		String		url )
	{
		Program.launch( url );
	}
	
	/**
	 * Sets the checkbox in a Virtual Table while inside a SWT.SetData listener
	 * trigger.  SWT 3.1 has an OSX bug that needs working around.
	 * 
	 * @param item
	 * @param checked
	 */
	public static void setCheckedInSetData(final TableItem item,
			final boolean checked) {
		if (DIRECT_SETCHECKED) {
			item.setChecked(checked);
		} else {
			item.setChecked(!checked);
			item.getDisplay().asyncExec(new AERunnable() {
				public void runSupport() {
					item.setChecked(checked);
				}
			});
		}

		if (Constants.isWindowsXP || isGTK) {
			Rectangle r = item.getBounds(0);
			Table table = item.getParent();
			Rectangle rTable = table.getClientArea();
			
			r.y += VerticalAligner.getTableAdjustVerticalBy(table);
			table.redraw(0, r.y, rTable.width, r.height, true);
		}
	}
	
	
	public static boolean linkShellMetricsToConfig(final Shell shell,
			final String sConfigPrefix) {
		boolean isMaximized = COConfigurationManager.getBooleanParameter(
				sConfigPrefix + ".maximized", false);
		shell.setMaximized(isMaximized);

		String windowRectangle = COConfigurationManager.getStringParameter(
				sConfigPrefix + ".rectangle", null);
		boolean bDidResize = false;
		if (null != windowRectangle) {
			int i = 0;
			int[] values = new int[4];
			StringTokenizer st = new StringTokenizer(windowRectangle, ",");
			try {
				while (st.hasMoreTokens() && i < 4) {
					values[i++] = Integer.valueOf(st.nextToken()).intValue();
					if (values[i - 1] < 0)
						values[i - 1] = 0;
				}
				if (i == 4) {
					shell.setBounds(values[0], values[1], values[2], values[3]);
					bDidResize = true;
				}
			} catch (Exception e) {
			}
		}

		shell.addDisposeListener(new DisposeListener() {
			public void widgetDisposed(DisposeEvent e) {
				COConfigurationManager.setParameter(sConfigPrefix + ".maximized", shell
						.getMaximized());
				// unmaximize to get correct window rect
				if (shell.getMaximized())
					shell.setMaximized(false);

				Rectangle windowRectangle = shell.getBounds();
				COConfigurationManager.setParameter(sConfigPrefix + ".rectangle",
						windowRectangle.x + "," + windowRectangle.y + ","
								+ windowRectangle.width + "," + windowRectangle.height);
			}
		});

		return bDidResize;
	}
}