tooltiptext

  

public void createPartControl(Composite parent) {

final Composite top = new Composite(parent, SWT.NONE);

GridLayout topLayout = new GridLayout(2, false);

top.setLayout(topLayout);

Label label = new Label(top, SWT.NONE);

label.setLayoutData(new GridData(SWT.BEGINNING, SWT.CENTER, false,false));

label.setText("Name:");

final Text text = new Text(top, SWT.SINGLE | SWT.LEAD | SWT.BORDER);

text.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));

text.setText("");

final Color bgColor = PlatformUI.getWorkbench().getDisplay().getSystemColor(SWT.COLOR_RED);

final Color fgColor = PlatformUI.getWorkbench().getDisplay().getSystemColor(SWT.COLOR_BLACK);

final AtomicReference x = new AtomicReference();

final AtomicReference y = new AtomicReference();

text.addMouseTrackListener(new MouseTrackAdapter(){

public void mouseHover(MouseEvent e) {

x.set(e.x);

y.set(e.y);

text.redraw();

}

});

text.addPaintListener(new PaintListener(){

public void paintControl(PaintEvent e) {

GC gc = e.gc;

if(x.get() != null && y.get() != null){

Rectangle rect = new Rectangle(x.get(),y.get(),100,20);

gc.setBackground(bgColor);

gc.setForeground(fgColor);

gc.fillRectangle(rect);

gc.drawText("Hello, it works!", rect.x, rect.y);

}

}

});

}

 

 

http://blog.youkuaiyun.com/goggler/article/details/5044983