[DefaultValue(true)]
[Parameter]
public bool ResourceNavigatorVisible { get; set; }

<div>
    <div>
        <div>
            <DxButton RenderStyle="ButtonRenderStyle.None" Click="@ToggleResourceNavigator" IconCssClass="demo-resnavigator-icon" title="Toggle the resource navigator" />
            @if(ResourceNavigatorExpanded) {
                <span>Resources</span>
            }
        </div>
        @if(ResourceNavigatorExpanded) {
            <div>
                <DxTreeView AfterCollapse="@(e => UpdateExpandedState(e, false))" AfterExpand="@(e => UpdateExpandedState(e, true))">
                    <Nodes>
                        @foreach(Resource group in Groups) {
                            <DxTreeViewNode Text="@group.Name" Name="@group.Id.ToString()" Expanded="@IsExpanded(group)">
                                <Nodes>
                                    @foreach(Resource resource in GetResources(group)) {
                                        <DxTreeViewNode Text="@resource.Name">
                                            <Template>
                                                <DxCheckBox T="bool"
                                                            Checked="@IsVisible(resource)"
                                                            CheckedChanged="@(visible => UpdateVisibilty(resource, visible))">
                                                    @resource.Name
                                                </DxCheckBox>
                                            </Template>
                                        </DxTreeViewNode>
                                    }
                                </Nodes>
                            </DxTreeViewNode>
                        }
                    </Nodes>
                </DxTreeView>
            </div>
        }
    </div>
    <div>
        <DxScheduler @bind-StartDate="@StartDate"
                     DataStorage="@DataStorage"
                     VisibleResourcesDataSource="@VisibleResources"
                     GroupType="SchedulerGroupType.Resource"
                     ResourceNavigatorVisible="false">
            <DxSchedulerDayView DayCount="1" ShowWorkTimeOnly="true"></DxSchedulerDayView>
        </DxScheduler>
    </div>
</div>

@code {
    List<Resource> Groups = ResourceCollection.GetResourceGroups();

    List<Resource> VisibleResources = ResourceCollection.GetResources().Take(2).ToList();

    bool ResourceNavigatorExpanded { get; set; } = true;

    DateTime StartDate = DateTime.Today;

    DxSchedulerDataStorage DataStorage = new DxSchedulerDataStorage() {
        AppointmentsSource = ResourceAppointmentCollection.GetAppointments(),
        AppointmentMappings = new DxSchedulerAppointmentMappings() {
            Type = "AppointmentType",
            Start = "StartDate",
            End = "EndDate",
            Subject = "Caption",
            AllDay = "AllDay",
            Location = "Location",
            Description = "Description",
            LabelId = "Label",
            StatusId = "Status",
            RecurrenceInfo = "Recurrence",
            ResourceId = "ResourceId"
        },
        ResourcesSource = ResourceCollection.GetResources(),
        ResourceMappings = new DxSchedulerResourceMappings() {
            Id = "Id",
            Caption = "Name",
            BackgroundCssClass = "BackgroundCss",
            TextCssClass = "TextCss"
        }
    };

    Dictionary<int, bool> ExpandedState = new Dictionary<int, bool>();

    bool IsVisible(Resource resource) {
        return VisibleResources.Contains(resource);
    }

    void UpdateVisibilty(Resource resource, bool visible) {
        if(visible)
            VisibleResources.Add(resource);
        else
            VisibleResources.Remove(resource);
        VisibleResources = VisibleResources.OrderBy(p => p.Id).ToList();
    }

    bool IsExpanded(Resource resource) {
        return ExpandedState.ContainsKey(resource.Id) ? ExpandedState[resource.Id] : true;
    }

    void UpdateExpandedState(TreeViewNodeEventArgs args, bool expanded) {
        int resourceId = int.Parse(args.NodeInfo.Name);
        ExpandedState[resourceId] = expanded;
    }

    void ToggleResourceNavigator() {
        ResourceNavigatorExpanded = !ResourceNavigatorExpanded;
    }

    IEnumerable<Resource> GetResources(Resource group) {
        return ResourceCollection.GetResources()
            .Where(resource => resource.GroupId == group.Id);
    }
}

public class Appointment {
    public Appointment() { }

    public int AppointmentType { get; set; }
    public DateTime StartDate { get; set; }
    public DateTime EndDate { get; set; }
    public string Caption { get; set; }
    public string Description { get; set; }
    public string Location { get; set; }
    public int? Label { get; set; }
    public int Status { get; set; }
    public bool AllDay { get; set; }
    public string Recurrence { get; set; }
    public int? ResourceId { get; set; }
    public string Resources { get; set; }
    public bool Accepted { get; set; }
}

public static partial class ResourceAppointmentCollection {
    public static List<Appointment> GetAppointments() {
        DateTime date = DateTime.Now.Date;
        var dataSource = new List<Appointment>() {
            new Appointment {
                Accepted = true,
                Caption = "Install New Router in Dev Room",
                StartDate = date + (new TimeSpan(0, 10, 0, 0)),
                EndDate = date + (new TimeSpan(0, 12, 0, 0)),
                Status = 1,
                ResourceId = 0
            },
            new Appointment {
                Caption = "Upgrade Personal Computers",
                Accepted = false,
                StartDate = date + (new TimeSpan(0, 13, 0, 0)),
                EndDate = date + (new TimeSpan(0, 14, 30, 0)),
                Status = 2,
                ResourceId = 0
            },
            new Appointment {
                Caption = "Website Redesign Plan",
                Accepted = false,
                StartDate = date + (new TimeSpan(1, 9, 30, 0)),
                EndDate = date + (new TimeSpan(1, 11, 30, 0)),
                Status = 3,
                ResourceId = 0
            },
            new Appointment {
                Caption = "New Brochures",
                Accepted = true,
                StartDate = date + (new TimeSpan(1, 13, 30, 0)),
                EndDate = date + (new TimeSpan(1, 15, 15, 0)),
                Status = 4,
                ResourceId = 0
            },
            new Appointment {
                Caption = "Book Flights to San Fran for Sales Trip",
                Accepted = false,
                StartDate = date + (new TimeSpan(1, 12, 0, 0)),
                EndDate = date + (new TimeSpan(1, 13, 0, 0)),
                AllDay = true,
                Status = 1,
                ResourceId = 0
            },
            new Appointment {
                Caption = "Approve Personal Computer Upgrade Plan",
                Accepted = true,
                StartDate = date + (new TimeSpan(0, 10, 0, 0)),
                EndDate = date + (new TimeSpan(0, 12, 0, 0)),
                Status = 2
            },
            new Appointment {
                Caption = "Final Budget Review",
                Accepted = true,
                StartDate = date + (new TimeSpan(0, 13, 0, 0)),
                EndDate = date + (new TimeSpan(0, 15, 0, 0)),
                Status = 3,
                ResourceId = 1
            },
            new Appointment {
                Caption = "Install New Database",
                Accepted = false,
                StartDate = date + (new TimeSpan(0, 9, 45, 0)),
                EndDate = date + (new TimeSpan(1, 11, 15, 0)),
                Status = 4,
                ResourceId = 1
            },
            new Appointment {
                Accepted = true,
                Caption = "Approve New Online Marketing Strategy",
                StartDate = date + (new TimeSpan(1, 12, 0, 0)),
                EndDate = date + (new TimeSpan(1, 14, 0, 0)),
                Status = 1,
                ResourceId = 1
            },
            new Appointment {
                Accepted = true,
                Caption = "Customer Workshop",
                StartDate = date + (new TimeSpan(0, 11, 0, 0)),
                EndDate = date + (new TimeSpan(0, 12, 0, 0)),
                AllDay = true,
                Status = 2,
                ResourceId = 2
            },
            new Appointment {
                Accepted = true,
                Caption = "Prepare 2021 Marketing Plan",
                StartDate = date + (new TimeSpan(0, 11, 0, 0)),
                EndDate = date + (new TimeSpan(0, 13, 30, 0)),
                Status = 3,
                ResourceId = 2
            },
            new Appointment {
                Accepted = false,
                Caption = "Brochure Design Review",
                StartDate = date + (new TimeSpan(0, 14, 0, 0)),
                EndDate = date + (new TimeSpan(0, 15, 30, 0)),
                Status = 4,
                ResourceId = 2
            },
            new Appointment {
                Accepted = true,
                Caption = "Create Icons for Website",
                StartDate = date + (new TimeSpan(1, 10, 0, 0)),
                EndDate = date + (new TimeSpan(1, 11, 30, 0)),
                Status = 1,
                ResourceId = 1
            },
            new Appointment {
                Accepted = true,
                Caption = "Launch New Website",
                StartDate = date + (new TimeSpan(1, 12, 20, 0)),
                EndDate = date + (new TimeSpan(1, 14, 0, 0)),
                Status = 1,
                ResourceId = 2
            },
            new Appointment {
                Accepted = false,
                Caption = "Upgrade Server Hardware",
                StartDate = date + (new TimeSpan(1, 9, 0, 0)),
                EndDate = date + (new TimeSpan(1, 12, 0, 0)),
                Status = 2,
                ResourceId = 2
            },
            new Appointment {
                Accepted = true,
                Caption = "Book Flights to San Fran for Sales Trip",
                StartDate = date + (new TimeSpan(0, 14, 0, 0)),
                EndDate = date + (new TimeSpan(0, 17, 0, 0)),
                Status = 1,
                ResourceId = 3
            },
            new Appointment {
                Accepted = true,
                Caption = "Approve New Online Marketing Strategy",
                StartDate = date + (new TimeSpan(0, 12, 0, 0)),
                EndDate = date + (new TimeSpan(0, 15, 0, 0)),
                Status = 3,
                ResourceId = 4
            }
        };
        return dataSource;
    }
}

public class Resource {
        public int Id { get; set; }
        public int? GroupId { get; set; }
        public string Name { get; set; }
        public bool IsGroup { get; set; }

        public string TextCss { get; set; }
        public string BackgroundCss { get; set; }

        public override bool Equals(object obj) {
            Resource resource = obj as Resource;
            return resource != null && resource.Id == Id;
        }

        public override int GetHashCode() {
            return Id;
        }
    }
}

public static partial class ResourceCollection {
    public static List<Resource> GetResourcesForGrouping() {
        return GetResources().Take(3).ToList();
    }

    public static List<Resource> GetResources() {
        return new List<Resource>() {
            new Resource() { Id=0 , Name="Nancy Davolio", GroupId=100, BackgroundCss="dxbl-green-color", TextCss="dxbl-white-font-color" },
            new Resource() { Id=1 , Name="Andrew Fuller", GroupId=101, BackgroundCss="dxbl-orange-color", TextCss="dxbl-white-font-color" },
            new Resource() { Id=2 , Name="Janet Leverling", GroupId=100, BackgroundCss="dxbl-purple-color", TextCss="dxbl-white-font-color" },
            new Resource() { Id=3 , Name="Margaret Peacock", GroupId=101, BackgroundCss="dxbl-indigo-color", TextCss="dxbl-white-font-color" },
            new Resource() { Id=4 , Name="Steven Buchanan", GroupId=100, BackgroundCss="dxbl-red-color", TextCss="dxbl-white-font-color" }
        };
    }

    public static List<Resource> GetResourceGroups() {
        return new List<Resource>() {
            new Resource() { Id=100, Name="Sales and Marketing", IsGroup=true },
            new Resource() { Id=101, Name="Engineering", IsGroup=true }
        };
    }
}