@using Telerik.DataSource
@using Telerik.DataSource.Extensions

@( new MarkupString(output) )

<br />
<TelerikButton OnClick="@GetFilters">Get Filters</TelerikButton>


<TelerikGrid Data=@GridData TotalCount=@Total OnRead=@ReadItems
             FilterMode=@GridFilterMode.FilterRow Sortable=true Pageable=true EditMode="@GridEditMode.Inline">
    <GridToolBar>
        <GridSearchBox />
    </GridToolBar>
    <GridColumns>
        <GridColumn Field=@nameof(Employee.ID) />
        <GridColumn Field=@nameof(Employee.Name) Title="Name" />
        <GridColumn Field=@nameof(Employee.HireDate) Title="Hire Date" />
        <GridCommandColumn>
            <GridCommandButton Command="Save" Icon="save" ShowInEdit="true">Update</GridCommandButton>
            <GridCommandButton Command="Edit" Icon="edit">Edit</GridCommandButton>
            <GridCommandButton Command="Delete" Icon="delete">Delete</GridCommandButton>
            <GridCommandButton Command="Cancel" Icon="cancel" ShowInEdit="true">Cancel</GridCommandButton>
        </GridCommandColumn>
    </GridColumns>
</TelerikGrid>

@code {
    TelerikGrid<Employee> GridRef { get; set; }
    string output { get; set; }
    public DataSourceRequest CurrentRequest { get; set; }
    void GetFilters()
    {
        output = string.Empty;


        foreach (var item in CurrentRequest.Filters)
        {
            if (item is FilterDescriptor) // filter row
            {
                FilterDescriptor currFilter = item as FilterDescriptor;
                output += $"field: {currFilter.Member}, operator {currFilter.Operator}, value: {currFilter.Value}<br />";
            }

            if (item is CompositeFilterDescriptor) // filter menu
            {
                CompositeFilterDescriptor currFilter = item as CompositeFilterDescriptor;
                output += $"START nested filter: logical operator: {currFilter.LogicalOperator}, details:<br />";
                // there will actually be 1 or 2 only, this showcases the concept and the types
                foreach (FilterDescriptor nestedFilter in currFilter.FilterDescriptors)
                {

                    output += $"field: {nestedFilter.Member}, operator {nestedFilter.Operator}, value: {nestedFilter.Value}<br />";
                }
                output += "END nested filter<br />";
            }
        }
    }




    public List<Employee> SourceData { get; set; }
    public List<Employee> GridData { get; set; }
    public int Total { get; set; } = 0;

    protected override void OnInitialized()
    {
        SourceData = GenerateData();
    }

    protected async Task ReadItems(GridReadEventArgs args)
    {
        CurrentRequest = args.Request;


        var datasourceResult = SourceData.ToDataSourceResult(args.Request);

        GridData = (datasourceResult.Data as IEnumerable<Employee>).ToList();
        Total = datasourceResult.Total;

        StateHasChanged();
    }

    //This sample implements only reading of the data. To add the rest of the CRUD operations see
    //https://docs.telerik.com/blazor-ui/components/grid/editing/overview

    private List<Employee> GenerateData()
    {
        var result = new List<Employee>();
        var rand = new Random();
        for (int i = 0; i < 100; i++)
        {
            result.Add(new Employee()
            {
                ID = i,
                Name = "Name " + i,
                HireDate = DateTime.Now.Date.AddDays(rand.Next(-20, 20))
            });
        }

        return result;
    }

    public class Employee
    {
        public int ID { get; set; }
        public string Name { get; set; }
        public DateTime HireDate { get; set; }
    }
}

<InputTextArea class="k-textarea" @bind-Value="@myValue"></InputTextArea>

@{
    if (GridColumns.Count() > 0)
    {
        <TelerikGrid Data="@Data">
            <GridColumns>
                @foreach (var column in GridColumns)
                    {
                    <GridColumn Field="@column.DataField"
                                ShowColumnMenu="false" Title="@column.DisplayName" Resizable="true" Width="500px">
                        <FooterTemplate>
                            foo
                        </FooterTemplate>
                    </GridColumn>
                    }
            </GridColumns>
        </TelerikGrid>
    }
}

@using Telerik.Blazor.Common.Export.Excel
@using Telerik.Blazor.Components.Grid

<TelerikGrid TItem="@FlowRun"
             Pageable="true"
             OnRead="@GetData">

    <GridToolBar>
        <GridCommandButton Command="ExcelExport" Icon="file-excel">Export to Excel</GridCommandButton>
        <GridCommandButton Command="CsvExport" Icon="file-csv">Export to CSV</GridCommandButton>
        <label class="k-checkbox-label"><TelerikCheckBox @bind-Value="@ExportAllPages" />Export All Pages</label>
    </GridToolBar>

    <GridExport>
        <GridExcelExport FileName="telerik-grid-export" AllPages="@ExportAllPages" OnBeforeExport="@BeforeExcelExport" />
        <GridCsvExport FileName="telerik-grid-export" AllPages="@ExportAllPages" OnBeforeExport="@BeforeCsvExport" />
    </GridExport>

    <GridColumns>
        <GridColumn Field="@nameof(FlowRun.FileName)" Title="File Name" Width="300px" />
        <GridColumn Field="@nameof(FlowRun.Type)" Title="Type" Width="100px" />
        <GridColumn Field="@nameof(FlowRun.FileSize)" Title="File Size" Width="200px" />
        <GridColumn Title="Source">
            <Columns>
                <GridColumn Field="@(nameof(FlowRun.Source))" Title="MPID"/>
                <GridColumn Field="@(nameof(FlowRun.SourceFileProtocol))" Title="Type" />
            </Columns>
        </GridColumn>
        <GridColumn Field="@nameof(FlowRun.ErrorMessage)"
                    Title = "Error"
                    Width="0" />
    </GridColumns>
</TelerikGrid>

@code {
    bool ExportAllPages { get; set; }

    private async Task GetData(GridReadEventArgs args)
    {
        args.Data = Enumerable.Range(1, 10).Select(x => new FlowRun
            {
                FileName = $"File {x}",
                Type = $"Type {x}",
                FileSize = x * 2,
                Source = $"Source {x}",
                SourceFileProtocol = FileProtocol.CIX,
                ErrorMessage = $"Error {x}"
            }).ToList();

        args.Total = 100;
    }

    private void BeforeCsvExport(GridBeforeCsvExportEventArgs obj)
    {
        AddErrorMessageColumn(obj);
    }

    private void BeforeExcelExport(GridBeforeExcelExportEventArgs obj)
    {
        AddErrorMessageColumn(obj);
    }

    private void AddErrorMessageColumn(GridBeforeSpreadsheetExportEventArgs args)
    {
        args.Columns.Find(x => x.Field == nameof(FlowRun.ErrorMessage)).Width = "100px";

        //args.Columns.Add(new ExcelExportableColumn
        //{            
        //    Field = nameof(FlowRun.ErrorMessage),
        //    Title = "Error"
        //});
    }

    public class FlowRun
    {
        public string FileName { get; set; }
        public string Type { get; set; }
        public long? FileSize { get; set; }
        public string Source { get; set; }
        public FileProtocol SourceFileProtocol { get; set; }
        public string ErrorMessage { get; set; }
    }

    public enum FileProtocol
    {
        Unknown,
        PIX,
        CIX,
        SS
    }
}

.....
-->>Clicking on Button for changing grid mode and visibility of columns**
<TelerikToggleButton Title="Oznaceni vice radku" Icon="@FontIcon.ListUnordered" OnClick="@( _  =>{ CurrentStackItem.gSelectionMode=(CurrentStackItem.gSelectionMode==GridSelectionMode.Multiple)?GridSelectionMode.Single:GridSelectionMode.Multiple;CurrentStackItem.gSelectedItems = Enumerable.Empty<ExpandoObject>();})"
				Selected="@(CurrentStackItem.gSelectionMode==GridSelectionMode.Multiple)"></TelerikToggleButton>
....
<GridColumns>
-->>First "static" 2 columns**
<GridCheckboxColumn Visible=@(CurrentStackItem.gSelectionMode==GridSelectionMode.Multiple) @key="@("sIDX")" Width="70px" Locked="true" SelectAll="true" SelectAllMode="GridSelectAllMode.Current"></GridCheckboxColumn><GridColumn FieldType=@typeof(bool) Visible=@(IsPicker==true || (XSmall==false && CurrentStackItem.gSelectionMode==GridSelectionMode.Single )) @key="@("sCMD")" Filterable="false" Sortable="false" Locked="true" Width="@((IsPicker==true && XSmall==true)?"45px":"120px")">
			<HeaderTemplate>&nbsp;</HeaderTemplate><Template Context="ctx"><div @onclick:preventDefault="true" @onclick:stopPropagation="true">

-->> THIS part is hitting LOT OF TIME in debug (expected is at best only once)
				@{if (XSmall==false)
					{
-->> here is LOT OF dynamic buttons.

				}
					</div></Template></GridColumn>

-->> rest of the dynamic columns. In video, starting with "ciiislo org" in header

			@if (GridDef.ColStore != null && GridDef.ColStore.Any())
			{
				foreach (var it in GridDef.ColStore.Where(x => x.Verejny == true))
				{
					<GridColumn @key=@it.FldName Field=@it.FldName FieldType=@it.FldType Title=@it.VerejnyNazev ShowFilterCellButtons="false" Width=@it.cSirkaSestava
					TextAlign=@it.cZarovnani 
					><FooterTemplate>
							@if (it.Sumovat == true)
							{
								@context.Sum
							}
						</FooterTemplate></GridColumn>
				}
			}
		</GridColumns>