TransferListTest.razor

@namespace MudExtensions.UnitTests.TestComponents
@using MudBlazor.Extensions

<MudGrid>
    <MudItem xs="12" sm="8" Class="d-flex flex-column align-center justify-center">
        <MudTransferList @ref="_transferList" T="string" @bind-StartCollection="_startCollection" @bind-EndCollection="_endCollection" Vertical="_vertical" Color="_color"
            StyleListCommon="background-color: var(--mud-palette-background-gray); width: 200px" MultiSelection="_multiSelection" MaxItems="_maxItems" SelectAllType="_selectAllType"
            PreventTransfer="@(new Func<bool, bool>(CheckTransfer))" OrderFunc="@(_orderOnTransfer == false ? null : new Func<ICollection<string>, ICollection<string>>(OrderMethod))" ButtonVariant="_buttonVariant"
            AllowDoubleClick="_allowDoubleClick" SearchBoxStart="_searchboxStart" SearchBoxEnd="_searchboxEnd"
            StartTitle="@_startTitle" EndTitle="@_endTitle" />
    </MudItem>

    <MudItem xs="12" sm="4">
        <MudStack Spacing="4">
            <MudText><b>Start Collection:</b> @string.Join(", ", _startCollection ?? new List<string>())</MudText>
            <MudText><b>End Collection:</b> @string.Join(", ", _endCollection ?? new List<string>())</MudText>
            <MudSwitchM3 @bind-Value="_vertical" Label="Vertical" Color="Color.Secondary" />
            <MudSwitchM3 @bind-Value="_multiSelection" Label="MultiSelection" Color="Color.Secondary" />
            <MudSwitchM3 @bind-Value="_preventTurkeyTransfer" Label="Prevent Transfer If Turkey Selected" Color="Color.Secondary" />
            <MudSwitchM3 @bind-Value="_orderOnTransfer" Label="Order on Transfer" Color="Color.Secondary" />
            <MudSwitchM3 @bind-Value="_allowDoubleClick" Label="Allow Double Click" Color="Color.Secondary" />
            <MudSwitchM3 @bind-Value="_searchboxStart" Label="SearchBox Start" Color="Color.Secondary" />
            <MudSwitchM3 @bind-Value="_searchboxEnd" Label="SearchBox End" Color="Color.Secondary" />
            <MudNumericField @bind-Value="_maxItems" Clearable="true" Label="MaxItems" Variant="Variant.Outlined" Margin="Margin.Dense" />
            <MudSelectExtended @bind-Value="_selectAllType" ItemCollection="@(Enum.GetValues<SelectAllType>())" Label="SelectAll Type" Variant="Variant.Outlined" Margin="Margin.Dense" Dense="true" />
            <MudSelectExtended @bind-Value="_color" ItemCollection="@(Enum.GetValues<Color>())" Label="Color" Variant="Variant.Outlined" Margin="Margin.Dense" Dense="true" />
            <MudSelectExtended @bind-Value="_buttonVariant" ItemCollection="@(Enum.GetValues<Variant>())" Label="Button Variant" Variant="Variant.Outlined" Margin="Margin.Dense" Dense="true" />
            <MudTextFieldExtended @bind-Value="_startTitle" Label="Start Title" Variant="Variant.Outlined" Immediate="true" />
            <MudTextFieldExtended @bind-Value="_endTitle" Label="End Title" Variant="Variant.Outlined" Immediate="true" />
        </MudStack>
    </MudItem>
</MudGrid>

@code{
    MudTransferList<string> _transferList = new();
    ICollection<string> _startCollection = new List<string>() { "Sweden", "Hungary", "Turkey", "England", "Egypt" };
    ICollection<string> _endCollection = new List<string>() { "Brazil", "China", "Germany", "USA", "South Africa" };

    bool _vertical;
    bool _multiSelection;
    bool _preventTurkeyTransfer;
    bool _orderOnTransfer;
    bool _allowDoubleClick;
    bool _searchboxStart;
    bool _searchboxEnd;
    int? _maxItems;
    SelectAllType _selectAllType = SelectAllType.Buttons;
    Color _color = Color.Primary;
    Variant _buttonVariant = Variant.Text;
    string _startTitle = "Country Group 1";
    string _endTitle = "Country Group 2";

    private bool CheckTransfer(bool startToEnd)
    {
        var valuesStart = _transferList.GetStartListSelectedValues();
        var valuesEnd = _transferList.GetEndListSelectedValues();
        if (_preventTurkeyTransfer == true && (valuesStart?.Contains("Turkey") == true || valuesEnd?.Contains("Turkey") == true))
        {
            return true;
        }
        return false;
    }

    private ICollection<string> OrderMethod(ICollection<string> e)
    {
        return e.Order().ToList();
    }
}