dragdrop.java

利用Eclipse平台开发在SWT中拖拽字符及文件的操作类

import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.DragSource;
import org.eclipse.swt.dnd.DragSourceAdapter;
import org.eclipse.swt.dnd.DragSourceEvent;
import org.eclipse.swt.dnd.DropTarget;
import org.eclipse.swt.dnd.DropTargetAdapter;
import org.eclipse.swt.dnd.DropTargetEvent;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;


public class DragDrop {

	protected Shell shell;

	/**
	 * Launch the application
	 * @param args
	 */
	public static void main(String[] args) {
		try {
			DragDrop window = new DragDrop();
			window.open();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * Open the window
	 */
	public void open() {
		final Display display = Display.getDefault();
		createContents();
		shell.open();
		shell.layout();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch())
				display.sleep();
		}
	}

	/**
	 * Create contents of the window
	 */
	protected void createContents() {
		shell = new Shell();
		shell.setSize(500, 375);
		shell.setText("SWT Application");
		//
		
		
        final   StyledText   text1   =   new   StyledText(shell,1); 
        text1.setBounds(10, 10, 262, 65);
        text1.setText("aaaaaaaaaaaaaaaaaaaaaaaaaaa"); 
        DragSource   source   =   new   DragSource(text1,DND.DROP_COPY|DND.DROP_MOVE); 
        source.setTransfer(new   Transfer[]   {TextTransfer.getInstance()}); 
        source.addDragListener(new   DragSourceAdapter()   { 
        Point   selection; 
        public   void   dragStart(DragSourceEvent   e)   { 
        selection   =   text1.getSelection(); 
        e.doit   =   selection.x   !=   selection.y; 
        } 
        public   void   dragSetData(DragSourceEvent   e)   { 
        e.data   =   text1.getText(selection.x,   selection.y-1); 
        } 
        public   void   dragFinished(DragSourceEvent   e)   { 
        if   (e.detail   ==   DND.DROP_MOVE)   { 
        text1.replaceTextRange(selection.x,   selection.y   -   selection.x,   " "); 
        } 
        selection   =   null; 
        } 
        }); 

        final   StyledText   text2   =   new   StyledText(shell,   1); 
        text2.setBounds(40, 199, 232, 91);
        text2.setText("bbbbbbbbbbbbbbb"); 
        DropTarget   target   =   new   DropTarget(text2,   DND.DROP_DEFAULT |  DND.DROP_MOVE | DND.DROP_COPY | DND.DROP_LINK); 
        target.setTransfer(new   Transfer[]   {TextTransfer.getInstance()}); 
        target.addDropListener(new   DropTargetAdapter()   { 
        public   void   dragEnter(DropTargetEvent   e)   { 
        if   (e.detail   ==   DND.DROP_DEFAULT) 
        e.detail   =   DND.DROP_COPY; 
        } 
        public   void   dragOperationChanged(DropTargetEvent   e)   { 
        if   (e.detail   ==   DND.DROP_DEFAULT) 
        e.detail   =   DND.DROP_COPY; 
        } 
        public   void   drop(DropTargetEvent   e)   { 
        text2.insert((String)e.data); 
        } 
        });
		
		
	}

}