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<BR><BR><IMG src="DND入门学习.files/6.gif" align=left border=0> <SPAN
class=tpc_title>DND入门学习</SPAN><BR><BR><SPAN class=tpc_content>Drag
and
Drop是Eclipse为用户在一个或多个SWT应用之间重置部件或数据传输上提供的简单快捷的机制。可以使用在普通SWT应用中，也是学习GEF的基础部分。下面我从以下几个Drag
and Drop所必需的部分来简单讲述：<BR><BR><B>DragSource And DropTarget
</B><BR><BR>? ? 要实现Drag and Drop，就必须要有DragSource And
DropTarget。DragSource是数据传输过程中的数据提供者,而DropTarget是数据接收者。他们分别绑定SWT的widget，需要注意的是同一widget只能帮定在一个DragSource或DropTarget上。在鼠标拖动的过程中，我们可以通过鼠标图形的变化来得知当前经过的是否是一个有效的DropTarget，这个过程叫做“drag
over
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