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package com.vaadin.tests.components.treegrid;
import java.util.stream.Stream;
import com.vaadin.data.TreeData;
import com.vaadin.data.ValueProvider;
import com.vaadin.data.provider.HierarchicalQuery;
import com.vaadin.data.provider.TreeDataProvider;
import com.vaadin.server.SerializablePredicate;
import com.vaadin.server.VaadinRequest;
import com.vaadin.tests.components.AbstractTestUI;
import com.vaadin.ui.Button;
import com.vaadin.ui.TreeGrid;
public class TreeGridChangingHierarchy extends AbstractTestUI {
private static class TestDataProvider extends TreeDataProvider<String> {
private TreeData<String> treeData;
public TestDataProvider(TreeData<String> treeData) {
super(treeData);
this.treeData = treeData;
}
@Override
public boolean hasChildren(String item) {
if (!treeData.contains(item)) {
return false;
}
return super.hasChildren(item);
}
@Override
public Stream<String> fetchChildren(
HierarchicalQuery<String, SerializablePredicate<String>> query) {
if (!treeData.contains(query.getParent())) {
return Stream.empty();
}
return super.fetchChildren(query);
}
}
@Override
protected void setup(VaadinRequest request) {
TreeData<String> data = new TreeData<>();
data.addItems(null, "a", "b", "c").addItem("b", "b/a");
TreeGrid<String> grid = new TreeGrid<>();
grid.setDataProvider(new TestDataProvider(data));
grid.addColumn(ValueProvider.identity());
Button btn = new Button("add items to a and refresh");
btn.addClickListener(event -> {
data.addItems("a", "a/a", "a/b");
grid.getDataProvider().refreshItem("a");
});
Button btn2 = new Button("add items to a/a and refresh");
btn2.addClickListener(event -> {
data.addItems("a/a", "a/a/a", "a/a/c").addItem("a/a/a", "a/a/a/a");
grid.getDataProvider().refreshItem("a/a");
});
Button btn3 = new Button("remove a/a");
btn3.addClickListener(event -> {
data.removeItem("a/a");
// Inform item removal to DataProvider
grid.getDataProvider().refreshAll();
});
Button btn4 = new Button("remove children of a/a");
btn4.addClickListener(event -> {
data.removeItem("a/a/a");
data.removeItem("a/a/c");
// Inform item removal to DataProvider
grid.getDataProvider().refreshAll();
});
Button btn5 = new Button("remove a");
btn5.addClickListener(event -> {
data.removeItem("a");
// Inform item removal to DataProvider
grid.getDataProvider().refreshAll();
});
Button btn6 = new Button("remove children of a");
btn6.addClickListener(event -> {
data.removeItem("a/a");
data.removeItem("a/b");
// Inform item removal to DataProvider
grid.getDataProvider().refreshAll();
});
Button btn7 = new Button("remove children of a/a/a");
btn7.addClickListener(event -> {
data.removeItem("a/a/a/a");
// Inform item removal to DataProvider
grid.getDataProvider().refreshAll();
});
addComponents(grid, btn, btn2, btn3, btn4, btn5, btn6, btn7);
}
}
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