com.vaadin.flow.component.contextmenu.MenuManager Maven / Gradle / Ivy
/**
* Copyright (C) 2000-2024 Vaadin Ltd
*
* This program is available under Vaadin Commercial License and Service Terms.
*
* See for the full
* license.
*/
package com.vaadin.flow.component.contextmenu;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import com.vaadin.flow.component.ClickEvent;
import com.vaadin.flow.component.Component;
import com.vaadin.flow.component.ComponentEventListener;
import com.vaadin.flow.component.ComponentUtil;
import com.vaadin.flow.function.SerializableBiFunction;
import com.vaadin.flow.function.SerializableRunnable;
/**
* Common management logic for context menus and sub menus. Maintains the list
* of components to stamp into one overlay.
*
* @param
* the context menu type
* @param
* the menu item type
* @param
* the sub menu type
*
* @author Vaadin Ltd.
*/
public class MenuManager, S extends SubMenuBase>
implements Serializable {
private final C menu;
private final SerializableBiFunction itemGenerator;
private final Class itemType;
private final I parentMenuItem;
private final SerializableRunnable contentReset;
private final List children = new ArrayList<>();
/**
* Creates a new manager instance.
*
* @param menu
* the context menu
* @param contentReset
* callback to reset the context menu
* @param itemGenerator
* the item generator/factory
* @param itemType
* the item type
* @param parentMenuItem
* the parent menu item of the submenu
*/
public MenuManager(C menu, SerializableRunnable contentReset,
SerializableBiFunction itemGenerator,
Class itemType, I parentMenuItem) {
this.menu = menu;
this.contentReset = contentReset;
this.itemGenerator = itemGenerator;
this.itemType = itemType;
this.parentMenuItem = parentMenuItem;
}
/**
* Adds a text as a menu item.
*
* @param text
* the text for the menu item
* @return a new menu item
*/
public I addItem(String text) {
I menuItem = itemGenerator.apply(menu, contentReset);
menuItem.setText(text);
add(menuItem);
return menuItem;
}
/**
* Adds a component as a menu item.
*
* @param component
* the component for the menu item
* @return a new menu item
*/
public I addItem(Component component) {
I menuItem = itemGenerator.apply(menu, contentReset);
add(menuItem);
menuItem.add(component);
return menuItem;
}
/**
* Adds a text as a menu item with a click listener.
*
* @param text
* the text for the menu item
* @param clickListener
* a click listener
* @return a new menu item
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
public I addItem(String text,
ComponentEventListener> clickListener) {
I menuItem = addItem(text);
if (clickListener != null) {
ComponentUtil.addListener(menuItem, ClickEvent.class,
(ComponentEventListener) clickListener);
}
return menuItem;
}
/**
* Adds a component as a menu item with a click listener.
*
* @param component
* the component for the menu item
* @param clickListener
* a click listener
* @return a new menu item
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
public I addItem(Component component,
ComponentEventListener> clickListener) {
I menuItem = addItem(component);
if (clickListener != null) {
ComponentUtil.addListener(menuItem, ClickEvent.class,
(ComponentEventListener) clickListener);
}
return menuItem;
}
/**
* Adds components to the (sub)menu.
*
* The components are added into the content as is, they are not wrapped as
* menu items.
*
* @param components
* components to add
* @see #remove(Component...)
* @see #addComponentAtIndex(int, Component)
*/
public void add(Component... components) {
if (parentMenuItem != null && parentMenuItem.isCheckable()) {
throw new IllegalStateException(
"A checkable item cannot have a sub menu");
}
Objects.requireNonNull(components, "Components to add cannot be null");
for (Component component : components) {
Objects.requireNonNull(component,
"Component to add cannot be null");
children.add(component);
}
if (components.length > 0) {
updateChildren();
}
}
/**
* Removes components to the (sub)menu.
*
* @param components
* components to remove
* @see #add(Component...)
*/
public void remove(Component... components) {
Objects.requireNonNull(components,
"Components to remove cannot be null");
boolean needUpdate = false;
for (Component component : components) {
Objects.requireNonNull(component,
"Component to remove cannot be null");
if (children.remove(component)) {
needUpdate = true;
} else {
throw new IllegalArgumentException("The given component ("
+ component + ") is not a child of this component");
}
}
if (needUpdate) {
updateChildren();
}
}
/**
* Remove all components and items from (sub)menu.
*
* @see #remove(Component...)
*/
public void removeAll() {
children.clear();
updateChildren();
}
/**
* Inserts component to the (sub)menu using the {@code index}.
*
* The component is inserted into the content as is, it is not wrapped as a
* menu item.
*
* @param index
* index to insert, not negative
* @param component
* component to insert
*
* @see #add(Component...)
* @see #remove(Component...)
*/
public void addComponentAtIndex(int index, Component component) {
if (parentMenuItem != null && parentMenuItem.isCheckable()) {
throw new IllegalStateException(
"A checkable item cannot have a sub menu");
}
Objects.requireNonNull(component, "Component should not be null");
if (index < 0) {
throw new IllegalArgumentException(
"Cannot add a component with a negative index");
}
children.add(index, component);
updateChildren();
}
/**
* Gets all (sub)menu children.
*
* Children consist of components and items.
*
* @see #add(Component...)
* @see #addItem(Component)
*
* @see #getItems()
*
* @return the children components
*/
public Stream getChildren() {
return children.stream();
}
/**
* Gets all children items.
*
* The items are filtered using the provided item type in the constructor.
*
* @see #getChildren()
*
* @return all children items
*/
public List getItems() {
return getChildren().filter(itemType::isInstance).map(itemType::cast)
.collect(Collectors.toList());
}
private void updateChildren() {
contentReset.run();
}
}