How To select all childnodes on selecting a parent node

Hi

 

I am new to GWT

Developing Tree like structure with parent and child Cell having a checkbox and TextCell

want to know how to set all checkbox as selected under a Parent when Parent Item is seleted

 

I have tried SingleSelection and MultiSelectionModel

I am unable to retrieve all childs on selecting a parent Checkbox.

 

I have following doubts

 

do I need different selectionModel for parent cell and a child cell ?

how to get childobject when parent node is selected?

 

written following sample code for selection

 

//ChildNode SelectionModelfinal MultiSelectionModel<RequestNotifyDTO> selectionModel =

new MultiSelectionModel<RequestNotifyDTO>();

selectionModel.addSelectionChangeHandler(

new SelectionChangeEvent.Handler() {

public void onSelectionChange(SelectionChangeEvent event) {

StringBuilder sb = new StringBuilder();

boolean first = true;

List<RequestNotifyDTO> selected = new ArrayList<RequestNotifyDTO>(

selectionModel.getSelectedSet());

//Collections.sort(selected);

for (RequestNotifyDTO value : selected) {

if (first) {

first = false;

} else {

sb.append(", ");

}

sb.append(value.getUserName());

}

System.out.println("select value >> "+sb.toString());

}

});

//ParentNode SelectionModelfinal SingleSelectionModel<String> categorySelectionModel =

new SingleSelectionModel<String>();

categorySelectionModel.addSelectionChangeHandler(

new SelectionChangeEvent.Handler() {

public void onSelectionChange(SelectionChangeEvent event) {

Object obj=categorySelectionModel.getSelectedObject();

System.out.println("object >> "+obj);

//to do ????

}

});

 

Please assist

 

Regards

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