Implemented user selection and deletion

control-panel/src/main/java/ru/dragonestia/picker/cp/component/UserList.java

@@ -5,28 +5,51 @@ import com.vaadin.flow.component.button.ButtonVariant;
 import com.vaadin.flow.component.grid.ColumnTextAlign;
 import com.vaadin.flow.component.grid.Grid;
 import com.vaadin.flow.component.html.Span;
+import com.vaadin.flow.component.icon.Icon;
+import com.vaadin.flow.component.icon.VaadinIcon;
 import com.vaadin.flow.component.orderedlayout.VerticalLayout;
+import ru.dragonestia.picker.api.repository.UserRepository;
 import ru.dragonestia.picker.api.repository.response.type.RRoom;
 import ru.dragonestia.picker.api.repository.response.type.RUser;
 import ru.dragonestia.picker.api.repository.details.UserDetails;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Set;
+import java.util.function.Consumer;
 
 public class UserList extends VerticalLayout {
 
     private final RRoom room;
+    private final UserRepository userRepository;
+    private final Button buttonRemove;
     private final Grid<RUser> usersGrid;
     private final Span totalUsers = new Span();
     private final Span occupancy = new Span();
     private List<RUser> cachedUsers = new ArrayList<>();
 
-    public UserList(RRoom room, List<RUser> users) {
+    public UserList(RRoom room, List<RUser> users, UserRepository userRepository) {
         this.room = room;
+        this.userRepository = userRepository;
 
+        add(buttonRemove = createButtonRemove());
         add(usersGrid = createUsersGrid());
 
         update(users);
+        updateButtonRemove();
+    }
+
+    private Button createButtonRemove() {
+        var button = new Button("Unlink users");
+        button.setPrefixComponent(new Icon(VaadinIcon.UNLINK));
+        button.addThemeVariants(ButtonVariant.LUMO_PRIMARY, ButtonVariant.LUMO_ERROR);
+        button.addClickListener(event -> {
+            var users = usersGrid.getSelectedItems();
+            if (users.isEmpty()) return;
+            userRepository.unlinkFromRoom(room, users);
+            update(userRepository.all(room, UserRepository.ALL_DETAILS));
+        });
+        return button;
     }
 
     private Grid<RUser> createUsersGrid() {
@@ -35,6 +58,8 @@ public class UserList extends VerticalLayout {
         grid.addColumn(user -> user.getDetail(UserDetails.COUNT_ROOMS)).setTextAlign(ColumnTextAlign.CENTER).setHeader("Linked with rooms")
                 .setFooter(occupancy);
         grid.addComponentColumn(this::createManageButton).setHeader("Manage");
+        grid.setSelectionMode(Grid.SelectionMode.MULTI);
+        grid.addSelectionListener(event -> updateButtonRemove());
         return grid;
     }
 
@@ -54,6 +79,19 @@ public class UserList extends VerticalLayout {
         occupancy.setText("Occupancy: %s".formatted(getUsingPercentage(room.getSlots(), users.size())));
     }
 
+    private void updateButtonRemove() {
+        var users = usersGrid.getSelectedItems();
+
+        if (users.isEmpty()) {
+            buttonRemove.setEnabled(false);
+            buttonRemove.setText("Unlink users");
+            return;
+        }
+
+        buttonRemove.setEnabled(true);
+        buttonRemove.setText("Unlink users(" + users.size() + ")");
+    }
+
     public static String getUsingPercentage(int slots, int usedSlots) {
         if (slots == RRoom.INFINITE_SLOTS) return "N/A";
         double percent = usedSlots / (double) slots * 100;

control-panel/src/main/java/ru/dragonestia/picker/cp/page/RoomDetailsPage.java

@@ -64,7 +64,7 @@ public class RoomDetailsPage extends VerticalLayout implements BeforeEnterObserv
         add(addUsers = new AddUsers(room, (users, ignoreLimitation) -> appendUsers(room, users, ignoreLimitation)));
         add(new Hr());
         add(new H2("Users"));
-        add(userList = new UserList(room, userRepository.all(room, UserRepository.ALL_DETAILS)));
+        add(userList = new UserList(room, userRepository.all(room, UserRepository.ALL_DETAILS), userRepository));
     }
 
     private void updateRoomInfo() {

control-panel/src/main/java/ru/dragonestia/picker/cp/page/UserDetailsPage.java

@@ -1,11 +1,11 @@
 package ru.dragonestia.picker.cp.page;
 
+import com.vaadin.flow.component.Html;
 import com.vaadin.flow.component.button.Button;
 import com.vaadin.flow.component.button.ButtonVariant;
 import com.vaadin.flow.component.grid.Grid;
 import com.vaadin.flow.component.html.H2;
 import com.vaadin.flow.component.html.H3;
-import com.vaadin.flow.component.html.Span;
 import com.vaadin.flow.component.orderedlayout.VerticalLayout;
 import com.vaadin.flow.router.BeforeEnterEvent;
 import com.vaadin.flow.router.BeforeEnterObserver;
@@ -71,4 +71,8 @@ public class UserDetailsPage extends VerticalLayout implements BeforeEnterObserv
     public void update(List<RRoom.Short> rooms) {
         gridRooms.setItems(cachedRooms = rooms);
     }
+
+    private Html createComponent(String defaultValue) {
+        return new Html("<span>" + defaultValue + "</span>");
+    }
 }