当鼠标按钮按下时，gwt 鼠标悬停事件不会触发
当您按下鼠标左键时，将触发 mouse down 事件。如果您随后将鼠标移动到标签上（同时按住鼠标按钮），则不会触发鼠标悬停事件。
有什么方法可以启用此事件或手动触发它们或模拟它们？
When you push down the left mouse button mouse down event fires. If you then move the mouse over a label (while holding the mouse button down) mouse over event does not fire.
Is there any way to enable this events or fire them manualy or simulate them?
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您实际上正在做的是两个单独的事件，一个是您所描述的鼠标按下事件，另一个是鼠标拖动事件。
如果您想模拟它们，您可能必须考虑使用鼠标单击来跟踪用户的 (x,y) 位置。随后，如果您想“模拟”它，您可以进行一些计算并自行决定是否确实发生了鼠标单击或鼠标拖动事件。
希望它有帮助:) 干杯！
What you are actually doing is two separate events, one is a mouse down event as you have described and the other is a mouse drag.
If you want to simulate them, that you might have to consider using a mouse click to track the user's (x,y) location. Subsequently, if you want to "simulate" it you could do some computation and decide for yourself if it is indeed a mouse click or mouse drag event that has occurred.
Hope it helps :) Cheers!