com.vaadin.flow.component.treegrid.demo.TreeGridDemo Maven / Gradle / Ivy
package com.vaadin.flow.component.treegrid.demo;
import com.vaadin.flow.component.Component;
import com.vaadin.flow.component.dependency.JsModule;
import com.vaadin.flow.component.grid.demo.GridDemo.Person;
import com.vaadin.flow.component.treegrid.demo.data.DepartmentData;
import com.vaadin.flow.component.treegrid.demo.entity.Account;
import com.vaadin.flow.component.treegrid.demo.entity.Department;
import com.vaadin.flow.component.treegrid.demo.service.AccountService;
import com.vaadin.flow.component.html.Div;
import com.vaadin.flow.component.html.NativeButton;
import com.vaadin.flow.component.html.Span;
import com.vaadin.flow.component.orderedlayout.VerticalLayout;
import com.vaadin.flow.component.textfield.TextArea;
import com.vaadin.flow.component.treegrid.TreeGrid;
import com.vaadin.flow.data.provider.hierarchy.AbstractBackEndHierarchicalDataProvider;
import com.vaadin.flow.data.provider.hierarchy.HierarchicalDataProvider;
import com.vaadin.flow.data.provider.hierarchy.HierarchicalQuery;
import com.vaadin.flow.demo.DemoView;
import com.vaadin.flow.router.Route;
import java.util.Collections;
import java.util.stream.Stream;
@Route("vaadin-tree-grid")
@JsModule("@vaadin/flow-frontend/grid-demo-styles.js")
public class TreeGridDemo extends DemoView {
/**
* Example object.
*/
public static class PersonWithLevel extends Person {
private int level;
public int getLevel() {
return level;
}
public void setLevel(int level) {
this.level = level;
}
}
@Override
protected void initView() {
createBasicTreeGridUsage();
createLazyLoadingTreeGridUsage();
createTreeGridWithComponentsInHierarchyColumnUsage();
}
private void createBasicTreeGridUsage() {
DepartmentData departmentData = new DepartmentData();
TextArea message = new TextArea("");
message.setHeight("100px");
message.setReadOnly(true);
// begin-source-example
// source-example-heading: TreeGrid Basics
TreeGrid grid = new TreeGrid<>();
grid.setItems(departmentData.getRootDepartments(),
departmentData::getChildDepartments);
grid.addHierarchyColumn(Department::getName)
.setHeader("Department Name");
grid.addColumn(Department::getManager).setHeader("Manager");
grid.addExpandListener(event -> message.setValue(
String.format("Expanded %s item(s)", event.getItems().size())
+ "\n" + message.getValue()));
grid.addCollapseListener(event -> message.setValue(
String.format("Collapsed %s item(s)", event.getItems().size())
+ "\n" + message.getValue()));
// end-source-example
grid.setId("treegridbasic");
addCard("TreeGrid Basics", withTreeGridToggleButtons(
departmentData.getRootDepartments().get(0), grid, message));
}
private Component[] withTreeGridToggleButtons(T root, TreeGrid grid,
Component... other) {
NativeButton toggleFirstItem = new NativeButton("Toggle first item",
evt -> {
if (grid.isExpanded(root)) {
grid.collapseRecursively(Collections.singleton(root),
0);
} else {
grid.expandRecursively(Collections.singleton(root), 0);
}
});
toggleFirstItem.setId("treegrid-toggle-first-item");
Div div1 = new Div(toggleFirstItem);
NativeButton toggleRecursivelyFirstItem = new NativeButton(
"Toggle first item recursively", evt -> {
if (grid.isExpanded(root)) {
grid.collapseRecursively(Collections.singleton(root),
2);
} else {
grid.expandRecursively(Collections.singleton(root), 2);
}
});
toggleFirstItem.setId("treegrid-toggle-first-item-recur");
Div div3 = new Div(toggleRecursivelyFirstItem);
return Stream.concat(Stream.of(grid, div1, div3), Stream.of(other))
.toArray(Component[]::new);
}
// TreeGrid with lazy loading
private void createLazyLoadingTreeGridUsage() {
AccountService accountService = new AccountService();
TextArea message = new TextArea("");
message.setHeight("100px");
message.setReadOnly(true);
// begin-source-example
// source-example-heading: TreeGrid with lazy loading
TreeGrid grid = new TreeGrid<>();
grid.addHierarchyColumn(Account::toString).setHeader("Account Title");
grid.addColumn(Account::getCode).setHeader("Code");
HierarchicalDataProvider dataProvider =
new AbstractBackEndHierarchicalDataProvider() {
@Override
public int getChildCount(HierarchicalQuery query) {
return (int) accountService.getChildCount(query.getParent());
}
@Override
public boolean hasChildren(Account item) {
return accountService.hasChildren(item);
}
@Override
protected Stream fetchChildrenFromBackEnd(
HierarchicalQuery query) {
return accountService.fetchChildren(query.getParent()).stream();
}
};
grid.setDataProvider(dataProvider);
// end-source-example
grid.setId("treegridlazy");
addCard("TreeGrid with lazy loading", grid);
}
private void createTreeGridWithComponentsInHierarchyColumnUsage() {
DepartmentData departmentData = new DepartmentData();
// begin-source-example
// source-example-heading: TreeGrid with Component in Hierarchy Column
TreeGrid grid = new TreeGrid<>();
grid.setItems(departmentData.getRootDepartments(), departmentData::getChildDepartments);
grid.addComponentHierarchyColumn(
department -> {
Span departmentName = new Span(department.getName());
Span managerName = new Span(department.getManager());
managerName.getStyle().set("color", "var(--lumo-secondary-text-color)");
managerName.getStyle().set("font-size", "var(--lumo-font-size-s)");
VerticalLayout departmentLine = new VerticalLayout(departmentName, managerName);
departmentLine.setPadding(false);
departmentLine.setSpacing(false);
return departmentLine;
}).setHeader("Departments");
// end-source-example
grid.setId("treegridcomponent");
addCard("TreeGrid with Component in Hierarchy Column", grid);
}
}