please help! how to emulate jre java.awt.MouseEvent in gwt?

i want to em开发者_开发百科ulate java.awt.MouseEvent class, and i define MouseEvent extends InputEvent which extends java.util.EventObject.

but when i run this in host mode, i got this error, it shows my InputEvent extends ComponentEvent. why? and how can i fix this? thanks!

java.lang.IllegalArgumentException: null source
    at java.util.EventObject.<init>(EventObject.java:38)
    at java.awt.AWTEvent.<init>(AWTEvent.java:279)
    at java.awt.event.ComponentEvent.<init>(ComponentEvent.java:96)
    at java.awt.event.InputEvent.<init>(InputEvent.java:204)
    at java.awt.event.MouseEvent.<init>(MouseEvent.java:548)
    at java.awt.event.MouseEvent.<init>(MouseEvent.java:450)

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this situation just happened in host mode, when i compile and deploy it, all work fine.

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You're using the wrong event - it should be MouseEvent (from the com.google.gwt.event.dom.client package), the one extending DomEvent<H>. See HasAllMouseHandlers for Widgets implementing all the mouse handlers (or check the individual interfaces for specific use cases).

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None of the AWT libraries are part of the GWT emulated JRE libraries. If you want to listen for MouseEvent, you have to add Mouse*Handler to a widget extending FocusWidget. For example, addMouseDownHandler on FocusWidget and it's subclasses. You'll get a MouseEvent when the mouse is pressed over that widget.