basicfilechooserui.java

Mobile 应用程序使用 Java Micro Edition (Java ME) 平台

		    }

		    resetGlobFilter();

		    // Check for directory change action
		    boolean isDir = (selectedFile != null && selectedFile.isDirectory());
		    boolean isTrav = (selectedFile != null && chooser.isTraversable(selectedFile));
		    boolean isDirSelEnabled = chooser.isDirectorySelectionEnabled();
		    boolean isFileSelEnabled = chooser.isFileSelectionEnabled();
		    boolean isCtrl = (e != null && (e.getModifiers() & ActionEvent.CTRL_MASK) != 0);

		    if (isDir && isTrav && (isCtrl || !isDirSelEnabled)) {
			changeDirectory(selectedFile);
			return;
		    } else if ((isDir || !isFileSelEnabled)
			       && (!isDir || !isDirSelEnabled)
			       && (!isDirSelEnabled || selectedFile.exists())) {
			selectedFile = null;
		    }
		}
	    }
	    if (selectedFiles != null || selectedFile != null) {
		if (selectedFiles != null || chooser.isMultiSelectionEnabled()) {
		    if (selectedFiles == null) {
			selectedFiles = new File[] { selectedFile };
		    }
		    chooser.setSelectedFiles(selectedFiles);
		    // Do it again. This is a fix for bug 4949273 to force the
		    // selected value in case the ListSelectionModel clears it
		    // for non-existing file names.
		    chooser.setSelectedFiles(selectedFiles);
		} else {
		    chooser.setSelectedFile(selectedFile);
		}
		chooser.approveSelection();
	    } else {
		if (chooser.isMultiSelectionEnabled()) { 
		    chooser.setSelectedFiles(null);
		} else {
		    chooser.setSelectedFile(null);
		}
		chooser.cancelSelection();
	    }
	}
    }


    private void resetGlobFilter() {
	if (actualFileFilter != null) {
	    JFileChooser chooser = getFileChooser();
	    FileFilter currentFilter = chooser.getFileFilter();
	    if (currentFilter != null && currentFilter.equals(globFilter)) {
		chooser.setFileFilter(actualFileFilter);
		chooser.removeChoosableFileFilter(globFilter);
	    }
	    actualFileFilter = null;
	}
    }

    private static boolean isGlobPattern(String filename) {
	return ((File.separatorChar == '\\' && (filename.indexOf('*') >= 0
						  || filename.indexOf('?') >= 0))
		|| (File.separatorChar == '/' && (filename.indexOf('*') >= 0
						  || filename.indexOf('?') >= 0
						  || filename.indexOf('[') >= 0)));
    }

    
    /* A file filter which accepts file patterns containing
     * the special wildcards *? on Windows and *?[] on Unix.
     */
    class GlobFilter extends FileFilter {
	Pattern pattern;
	String globPattern;

	public void setPattern(String globPattern) {
	    char[] gPat = globPattern.toCharArray();
	    char[] rPat = new char[gPat.length * 2];
	    boolean isWin32 = (File.separatorChar == '\\');
	    boolean inBrackets = false;
	    int j = 0;

	    this.globPattern = globPattern;

	    if (isWin32) {
		// On windows, a pattern ending with *.* is equal to ending with *
		int len = gPat.length;
		if (globPattern.endsWith("*.*")) {
		    len -= 2;
		}
		for (int i = 0; i < len; i++) {
		    switch(gPat[i]) {
		      case '*':
			rPat[j++] = '.';
			rPat[j++] = '*';
			break;

		      case '?':
			rPat[j++] = '.';
			break;

		      case '\\':
			rPat[j++] = '\\';
			rPat[j++] = '\\';
			break;

		      default:
			if ("+()^$.{}[]".indexOf(gPat[i]) >= 0) {
			    rPat[j++] = '\\';
			}
			rPat[j++] = gPat[i];
			break;
		    }
		}
	    } else {
		for (int i = 0; i < gPat.length; i++) {
		    switch(gPat[i]) {
		      case '*':
			if (!inBrackets) {
			    rPat[j++] = '.';
			}
			rPat[j++] = '*';
			break;

		      case '?':
			rPat[j++] = inBrackets ? '?' : '.';
			break;

		      case '[':
			inBrackets = true;
			rPat[j++] = gPat[i];

			if (i < gPat.length - 1) {
			    switch (gPat[i+1]) {
			      case '!':
			      case '^':
				rPat[j++] = '^';
				i++;
				break;

			      case ']':
				rPat[j++] = gPat[++i];
				break;
			    }
			}
			break;

		      case ']':
			rPat[j++] = gPat[i];
			inBrackets = false;
			break;

		      case '\\':
			if (i == 0 && gPat.length > 1 && gPat[1] == '~') {
			    rPat[j++] = gPat[++i];
			} else {
			    rPat[j++] = '\\';
			    if (i < gPat.length - 1 && "*?[]".indexOf(gPat[i+1]) >= 0) {
				rPat[j++] = gPat[++i];
			    } else {
				rPat[j++] = '\\';
			    }
			}
			break;

		      default:
			//if ("+()|^$.{}<>".indexOf(gPat[i]) >= 0) {
			if (!Character.isLetterOrDigit(gPat[i])) {
			    rPat[j++] = '\\';
			}
			rPat[j++] = gPat[i];
			break;
		    }
		}
	    }
	    this.pattern = Pattern.compile(new String(rPat, 0, j), Pattern.CASE_INSENSITIVE);
	}

	public boolean accept(File f) {
	    if (f == null) {
		return false;
	    }
	    if (f.isDirectory()) {
		return true;
	    }
	    return pattern.matcher(f.getName()).matches();
	}

	public String getDescription() {
	    return globPattern;
	}
    }

    /**
     * Responds to a cancel request.
     */
    protected class CancelSelectionAction extends AbstractAction {
	public void actionPerformed(ActionEvent e) {
	    getFileChooser().cancelSelection();
	}
    }

    /**
     * Rescans the files in the current directory
     */
    protected class UpdateAction extends AbstractAction {
	public void actionPerformed(ActionEvent e) {
	    JFileChooser fc = getFileChooser();
	    fc.setCurrentDirectory(fc.getFileSystemView().createFileObject(getDirectoryName()));
	    fc.rescanCurrentDirectory();
	}
    }


    private void changeDirectory(File dir) {
	JFileChooser fc = getFileChooser();
	// Traverse shortcuts on Windows
	if (dir != null) {
	    try {
                ShellFolder shellFolder = ShellFolder.getShellFolder(dir);
                if (shellFolder.isLink()) {
                    File linkedTo = shellFolder.getLinkLocation();
                    if (linkedTo != null && fc.isTraversable(linkedTo)) {
                        dir = linkedTo;
                    } else {
                        return;
                    }
                }
	    } catch (FileNotFoundException ex) {
		return;
	    }
	}
	fc.setCurrentDirectory(dir);
        if (fc.getFileSelectionMode() == JFileChooser.FILES_AND_DIRECTORIES &&
            fc.getFileSystemView().isFileSystem(dir)) {

            setFileName(dir.getAbsolutePath());
        }
    }


    // *****************************************
    // ***** default AcceptAll file filter *****
    // *****************************************
    protected class AcceptAllFileFilter extends FileFilter {

	public AcceptAllFileFilter() {
	}

	public boolean accept(File f) {
	    return true;
	}

	public String getDescription() {
	    return UIManager.getString("FileChooser.acceptAllFileFilterText");
	}
    }


    // ***********************
    // * FileView operations *
    // ***********************
    protected class BasicFileView extends FileView {
	/* FileView type descriptions */
	// PENDING(jeff) - pass in the icon cache size
	protected Hashtable<File,Icon> iconCache = new Hashtable<File,Icon>();

	public BasicFileView() {
	}

	public void clearIconCache() {
	    iconCache = new Hashtable<File,Icon>();
	}

	public String getName(File f) {
	    // Note: Returns display name rather than file name
	    String fileName = null;
	    if(f != null) {
		fileName = getFileChooser().getFileSystemView().getSystemDisplayName(f);
	    }
	    return fileName;
	}


	public String getDescription(File f) {
	    return f.getName();
	}

	public String getTypeDescription(File f) {
	    String type = getFileChooser().getFileSystemView().getSystemTypeDescription(f);
	    if (type == null) {
		if (f.isDirectory()) {
		    type = directoryDescriptionText;
		} else {
		    type = fileDescriptionText;
		}
	    }
	    return type;
	}

	public Icon getCachedIcon(File f) {
	    return (Icon) iconCache.get(f);
	}

	public void cacheIcon(File f, Icon i) {
	    if(f == null || i == null) {
		return;
	    }
	    iconCache.put(f, i);
	}

	public Icon getIcon(File f) {
	    Icon icon = getCachedIcon(f);
	    if(icon != null) {
		return icon;
	    }
	    icon = fileIcon;
	    if (f != null) {
		FileSystemView fsv = getFileChooser().getFileSystemView();

		if (fsv.isFloppyDrive(f)) {
		    icon = floppyDriveIcon;
		} else if (fsv.isDrive(f)) {
		    icon = hardDriveIcon;
		} else if (fsv.isComputerNode(f)) {
		    icon = computerIcon;
		} else if (f.isDirectory()) {
		    icon = directoryIcon;
		}
	    }
	    cacheIcon(f, icon);
	    return icon;
	}

	public Boolean isHidden(File f) {
	    String name = f.getName();
	    if(name != null && name.charAt(0) == '.') {
		return Boolean.TRUE;
	    } else {
		return Boolean.FALSE;
	    }
	}
    }

    private static final TransferHandler defaultTransferHandler = new FileTransferHandler();

    /**
     * Data transfer support for the file chooser.  Since files are currently presented
     * as a list, the list support is reused with the added flavor of DataFlavor.javaFileListFlavor
     */
    static class FileTransferHandler extends TransferHandler implements UIResource {

	/**
	 * Create a Transferable to use as the source for a data transfer.
	 *
	 * @param c  The component holding the data to be transfered.  This
	 *  argument is provided to enable sharing of TransferHandlers by
	 *  multiple components.
	 * @return  The representation of the data to be transfered. 
	 *  
	 */
        protected Transferable createTransferable(JComponent c) {
	    Object[] values = null;
	    if (c instanceof JList) {
		values = ((JList)c).getSelectedValues();
	    } else if (c instanceof JTable) {
		JTable table = (JTable)c;
		int[] rows = table.getSelectedRows();
		if (rows != null) {
		    values = new Object[rows.length];
		    for (int i=0; i<rows.length; i++) {
			values[i] = table.getValueAt(rows[i], 0);
		    }
		}
	    }
	    if (values == null || values.length == 0) {
		return null;
	    }

            StringBuffer plainBuf = new StringBuffer();
            StringBuffer htmlBuf = new StringBuffer();
		
            htmlBuf.append("<html>\n<body>\n<ul>\n");

            for (int i = 0; i < values.length; i++) {
                Object obj = values[i];
                String val = ((obj == null) ? "" : obj.toString());
                plainBuf.append(val + "\n");
                htmlBuf.append("  <li>" + val + "\n");
            }
            
            // remove the last newline
            plainBuf.deleteCharAt(plainBuf.length() - 1);
            htmlBuf.append("</ul>\n</body>\n</html>");
            
            return new FileTransferable(plainBuf.toString(), htmlBuf.toString(), values);
	}

        public int getSourceActions(JComponent c) {
	    return COPY;
	}

	static class FileTransferable extends BasicTransferable {
	    
	    Object[] fileData;

	    FileTransferable(String plainData, String htmlData, Object[] fileData) {
		super(plainData, htmlData);
		this.fileData = fileData;
	    }

	    /** 
	     * Best format of the file chooser is DataFlavor.javaFileListFlavor.
	     */
            protected DataFlavor[] getRicherFlavors() {
		DataFlavor[] flavors = new DataFlavor[1];
		flavors[0] = DataFlavor.javaFileListFlavor;
		return flavors;
	    }

	    /**
	     * The only richer format supported is the file list flavor
	     */
            protected Object getRicherData(DataFlavor flavor) {
		if (DataFlavor.javaFileListFlavor.equals(flavor)) {
		    ArrayList files = new ArrayList();
		    for (int i = 0; i < fileData.length; i++) {
			files.add(fileData[i]);
		    }
		    return files;
		}
		return null;
	    }

	}
    }
}