How to check if a widget got setWidgetHidden == true in SplitLayoutPanel?

Google provides setWidgetHidden(Widget) method for SplitLayoutPanel but i didn't see any method to check if a widget got setWidgetHidden == true in SplitLayoutPanel.

Say i set myWestWidget hidden == true as following: mySplitLayoutPanel.setWidgetHidden(myWestWidget, true);

Then i tried this code if (mySplitLayoutPanel.getWidgetSize(myWestWidget)==0) then //do something, but it doesn't recognize if that west widget got hidden.

So, How to check if a widget got setWidgetHidden == true in SplitLayoutPanel?

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