SWT制作下拉式toolbar菜单按钮的代码片段-JSP教程,Java技巧及代码

swt制作下拉式toolbar菜单按钮的代码片段:final toolitem dropdown = new toolitem(bar, swt.drop_down);dropdown.settext("drop-down");//一个popoupmenufinal menu menu = new menu(shell, swt.pop_up);menuitem choice = new menuitem(menu, swt.push);choice.settext("choices");dropdown.addlistener(swt.selection, new listener() {    public void handleevent(event event) {        if (event.detail == swt.arrow) {            rectangle rect = dropdown.getbounds();            point pt = new point(rect.x, rect.y + rect.height);            pt = bar.todisplay(pt);            menu.setlocation(pt.x, pt.y);            menu.setvisible(true);        }    }});