The initial mousedown handler is shown in Listing 11.

最初的mousedown处理程序如清单11所示。

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The text element has two events that it reacts to — mouseover and mousedown.

文字元素可以对两种事件做出反应——mouseover和mousedown。

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Also, at this point, you no longer need the mousedown handler, because you have already clicked.

而且，在此时，不再需要mousedown处理程序，因为已经进行单击。

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So when the shadow tree's rectangle receives a mousedown event, I change the CSS fill property to something a little flashier -- say pink.

因此，当影像树的矩形接收到mousedown事件时，我把CSS 的fill属性改成稍微亮一点的颜色——比如粉红色。

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However, at first, you only want to install the mousedown handler, because you're still waiting for the click that initiates the drag-and-drop sequence.

不过，开始时，只需安装mousedown处理程序，因为此时您尚在等待激发初始化拖放过程的单击。

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Then it's time to ask for listening for various mouse events (mousedown, mouseup, and click) on the shadow tree's rectangle — you'll see how to react to these later.

接下来要求对影像树的矩形监听各种不同的鼠标事件(mousedown、mouseup和click)，后面将看到如何响应这些事件。

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Then it's time to ask for listening for various mouse events (mousedown, mouseup, and click) on the shadow tree's rectangle — you'll see how to react to these later.

接下来要求对影像树的矩形监听各种不同的鼠标事件(mousedown、mouseup和click)，后面将看到如何响应这些事件。

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