macos:Drag-feedback
出自UXGuide.net
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拖动反馈
Drag Feedback
Your application should provide drag feedback as soon as the user drags an item at least three pixels. If a user holds the mouse button down on an object or selected text, it should become draggable immediately and stay draggable as long as the mouse remains down. Typically, applications have to provide an image to drag and have to handle the receiver frame. In Aqua, dragged items are transparent.
只要用户至少拖动了对象三个像素，您的程序就应该提供拖动反馈。如果用户在一个对象或者选定的文字上按下鼠标时，这些对象应该立即变成可被拖动的，并且只要鼠标一直是按下状态，则一直保持这种状态。通常，您的程序必须提供一个图片并填充到接收到的框架中。在Aqua中，拖动的对象是透明 的。
Note: Proxy icons are not immediately draggable. Since the proxy icon is in the title bar, where a user often clicks to initiate moving a window, a proxy icon requires a user to hold the mouse button down briefly before it becomes draggable.
注意: 代理图标不是可以立即拖动的。因为代理图标位于标题栏中，而用户经常点击这来移动窗口，所以用户需要在代理图标上按下鼠标过一会才能 拖动。
