method	return	type	Description
getSelectedTab()	int	read	Get the selected tab id.
changeSelectedTab(int selectedTab)	void	write	Change the selected tab.
getSelectedWorkspace()	int	read	Get selected workspace id.
getWorkspace()	GWTWorkspace	read	Get selected workspace object.
getTabExtensionIndex(TabWorkspaceExtension widget)	int	read	Get the tab id of the widget.
getAppVersion()	String	read	Retrieve the application version.

Sample

int tab = WorkspaceComunicator.getSelectedTab();
if (tab==0) {
  Window.alert("First tab enabled");
} else {
  Window.alert("Other stack");
}

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WorkspaceComunicator

Use it to retrieve workspace data.

method	return	type	Description
getSelectedTab()	int	read	Get the selected tab id.
changeSelectedTab(int selectedTab)	void	write	Change the selected tab.
getSelectedWorkspace()	int	read	Get selected workspace id.
getWorkspace()	GWTWorkspace	read	Get selected workspace object.
getTabExtensionIndex(TabWorkspaceExtension widget)	int	read	Get the tab id of the widget.
getAppVersion()	String	read	Retrieve the application version.

int tab = WorkspaceComunicator.getSelectedTab();
if (tab==0) {
  Window.alert("First tab enabled");
} else {
  Window.alert("Other stack");
}