simplefiletransfer.java

mywork是rcp开发的很好的例子

package net.sf.component.simplenote;

import org.eclipse.swt.dnd.ByteArrayTransfer;
import org.eclipse.swt.dnd.FileTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.dnd.TransferData;
/**
 * 实现支持gtk和win32的文件拷贝
 * @author levin
 */
public class SimpleFileTransfer extends ByteArrayTransfer {

	private static SimpleFileTransfer _instance = new SimpleFileTransfer();
	private static final String GNOME_LIST = "x-special/gnome-copied-files"; //$NON-NLS-1$
	private static final int GNOME_LIST_ID = registerType(GNOME_LIST);
	private static final String CF_HDROP = "CF_HDROP "; //$NON-NLS-1$
	private static final int CF_HDROPID = 15; //COM.CF_HDROP 跨平台，直接用常量

	
	private SimpleFileTransfer() {}
	
	public static Transfer getInstance() {
		return _instance;
	}

	@Override
	protected int[] getTypeIds() {
		return new int[]{CF_HDROPID,GNOME_LIST_ID};
	}

	@Override
	protected String[] getTypeNames() {
		return new String[]{CF_HDROP,GNOME_LIST};
	}

	@Override
	protected Object nativeToJava(TransferData transferData) {
		if (!isSupportedType(transferData)) return null;
		//直接处理gtk-gnome下的文件拷贝，是用copy file:///file1 file://file2这样的格式
		if(transferData.type == GNOME_LIST_ID){
			byte[] data=(byte[]) super.nativeToJava(transferData);
			if(data == null) return null;
			String fnames=new String(data);
			if(fnames == null || fnames.length() < 5)
				return null;
			fnames=fnames.substring(5);
			String[] fs=fnames.split("\n");
			for(int i=0;i<fs.length;i++){
				if(fs[i] != null && fs[i].length() >8)
					fs[i]=fs[i].substring(7);
			}
			return fs;
		}else if(transferData.type == CF_HDROPID){
			//win32下是正常的，直接调度一下
			return FileTransfer.getInstance().nativeToJava(transferData);
		}
		//不会到这
		return null;
	}
}