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TreeComboBox

ComboBox like component with hierarchical data.

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This is hierarchical ComboBox type single select component. It currently works with in-memory data providers, i.e. TreeDataProvider, it supports filtering, but not adding new items on the fly.

Sample code

		DepartmentData departmentData = new DepartmentData();
		TreeComboBox<Department> treeComboBox = new TreeComboBox<>(Department::getName);

		treeComboBox.setItems(departmentData.getRootDepartments(), departmentData::getChildDepartments);

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