deepdrft/DeepDrftPublic.Client/Controls/AudioPlayerBar/PlayerSeekZone.razor.cs

using Microsoft.AspNetCore.Components;

namespace DeepDrftPublic.Client.Controls.AudioPlayerBar;

/// <summary>
/// Centre zone of the player: seek slider over the spectrum visualizer.
/// Owns the pointer-gesture seek logic (drag-to-seek) in one place so it is no
/// longer duplicated inline between the desktop and mobile branches of the parent.
/// </summary>
public partial class PlayerSeekZone : ComponentBase
{
    private double _seekPosition;
    private bool _isSeeking = false;

    [Parameter] public double DisplayTime { get; set; }
    [Parameter] public double? Duration { get; set; }
    [Parameter] public bool CanSeek { get; set; }
    [Parameter] public EventCallback OnSeekStart { get; set; }
    [Parameter] public EventCallback<double> OnSeekEnd { get; set; }
    [Parameter] public EventCallback<double> OnSeekChange { get; set; }
    [Parameter] public string? Class { get; set; }

    private async Task HandlePointerDown()
    {
        _isSeeking = true;
        _seekPosition = DisplayTime;
        await OnSeekStart.InvokeAsync();
    }

    private async Task HandlePointerUp()
    {
        _isSeeking = false;
        await OnSeekEnd.InvokeAsync(_seekPosition);
    }

    private async Task HandlePointerLeave()
    {
        if (_isSeeking)
        {
            _isSeeking = false;
            await OnSeekEnd.InvokeAsync(_seekPosition);
        }
    }

    private async Task HandleValueChanged(double value)
    {
        _seekPosition = value;
        await OnSeekChange.InvokeAsync(value);
    }
}