LANCommander/LANCommander.Server/UI/Components/FilePickerButton.razor

@inject ArchiveService ArchiveService
@inject ModalService ModalService

@if (ArchiveId != Guid.Empty)
{
    <Button OnClick="BrowseForFile" Type="Type" Icon="@Icon" Disabled="@(!ArchiveExists || Disabled)" ChildContent="ChildContent" />
}
else if (!String.IsNullOrWhiteSpace(Root))
{
    <Button OnClick="BrowseForFile" Type="Type" Icon="@Icon" Disabled="@Disabled" ChildContent="ChildContent" />
}

@code {
    [Parameter] public string Value { get; set; }
    [Parameter] public EventCallback<string> ValueChanged { get; set; }
    [Parameter] public EventCallback<string> OnSelected { get; set; }
    [Parameter] public Guid ArchiveId { get; set; }
    [Parameter] public string Title { get; set; } = "Choose File";
    [Parameter] public string OkText { get; set; } = "Select File";
    [Parameter] public bool AllowDirectories { get; set; } = false;
    [Parameter] public string Prefix { get; set; }
    [Parameter] public string Root { get; set; }
    [Parameter] public Func<IFileManagerEntry, bool> EntrySelectable { get; set; } = _ => true;
    [Parameter] public Func<IFileManagerEntry, bool> EntryVisible { get; set; } = _ => true;
    [Parameter] public RenderFragment ChildContent { get; set; }
    [Parameter] public string Icon { get; set; }
    [Parameter] public ButtonType Type { get; set; }
    [Parameter] public bool Disabled { get; set; }

    bool ArchiveExists { get; set; } = false;

    protected override async Task OnInitializedAsync()
    {
        if (ArchiveId != Guid.Empty)
            ArchiveExists = await ArchiveService.FileExistsAsync(ArchiveId);
    }

    private async void BrowseForFile()
    {
        var modalOptions = new ModalOptions()
        {
            Title = Title,
            Maximizable = false,
            DefaultMaximized = true,
            Closable = true,
            OkText = OkText,
            WrapClassName = "file-picker-dialog"
        };

        var browserOptions = new FilePickerOptions()
        {
            ArchiveId = ArchiveId,
            Root = Root,
            Select = true,
            Multiple = false,
            EntrySelectable = EntrySelectable,
            EntryVisible = EntryVisible
        };

        var modalRef = await ModalService.CreateModalAsync<FilePickerDialog, FilePickerOptions, IEnumerable<IFileManagerEntry>>(modalOptions, browserOptions);

        modalRef.OnOk = async (results) =>
        {
            if (!String.IsNullOrWhiteSpace(Prefix))
                Value = Prefix + results?.FirstOrDefault()?.Path;
            else
                Value = results?.FirstOrDefault()?.Path;

            if (ValueChanged.HasDelegate)
                await ValueChanged.InvokeAsync(Value);

            if (OnSelected.HasDelegate)
                await OnSelected.InvokeAsync(Value);

            StateHasChanged();
        };
    }
}