deepdrft/DeepDrftPublic.Client/Controls/MixVisualizerControls.razor

@namespace DeepDrftPublic.Client.Controls
@using DeepDrftPublic.Client.Services
@inject MixVisualizerControlState ControlState

@* The Mix visualizer controls (lava reframe Wave R4). SEVEN continuous RadialKnobs — scroll speed,
   gradient rotation speed, lava gravity, lava heat, blob density, collision strength, waveform width —
   each its own dedicated control with a Material-icon caption (no more R2 temp-remapping: no knob
   caption misrepresents its function). The bar lives INLINE in the mix-detail controls area and
   ANIMATES open/closed in place via CSS transition off the @Expanded flag — it reads as the controls
   collapsing/expanding, NOT a floating popover/drawer (§7b).

   It owns NO JS interop: it mutates the shared, session-scoped MixVisualizerControlState and raises its
   Changed event. The backdrop bridge (MixWaveformVisualizer) subscribes to that event and pushes the
   affected dial to the WebGL module. That keeps the JS module handle single-owned by the bridge and
   this component purely presentational. None of these is a seek surface (read-only contract §D).

   RadialKnob has no icon slot (its Label renders as SVG text) and no aria attribute-capture, so each
   control's Material icon rides beside its knob as an adjacent MudIcon caption and the accessible name
   rides on the wrapping group div (§7d). HoldValue stays false so the knobs are live — ValueChanged
   fires continuously during drag, preserving the Changed/NotifyChanged seam.

   Aesthetic: the bar matches the session-hero NowPlaying overlay (§7e) — a translucent dark glass
   surface with overlay-label captions and Color.Secondary accents, so it reads as of-a-piece with the
   hero rather than a generic MudBlazor panel. *@

<div class="mix-visualizer-controls-bar @(Expanded ? "is-expanded" : "")" aria-hidden="@(!Expanded)">

    <div class="mix-visualizer-control" role="group" aria-label="Waveform scroll speed">
        <RadialKnob Value="@ControlState.ScrollSpeed"
                    ValueChanged="@OnScrollSpeedChanged"
                    Min="0" Max="1" Step="0.001"
                    Size="64"
                    Color="Color.Secondary" />
        <MudIcon Icon="@Icons.Material.Filled.Speed" Size="Size.Small" Class="mix-visualizer-control-icon" />
    </div>

    <div class="mix-visualizer-control" role="group" aria-label="Color gradient rotation speed">
        <RadialKnob Value="@ControlState.GradientRotationSpeed"
                    ValueChanged="@OnGradientRotationSpeedChanged"
                    Min="0" Max="1" Step="0.001"
                    Size="64"
                    Color="Color.Secondary" />
        <MudIcon Icon="@Icons.Material.Filled.Palette" Size="Size.Small" Class="mix-visualizer-control-icon" />
    </div>

    <div class="mix-visualizer-control" role="group" aria-label="Lava gravity">
        <RadialKnob Value="@ControlState.LavaGravity"
                    ValueChanged="@OnLavaGravityChanged"
                    Min="0" Max="1" Step="0.001"
                    Size="64"
                    Color="Color.Secondary" />
        <MudIcon Icon="@Icons.Material.Filled.ArrowDownward" Size="Size.Small" Class="mix-visualizer-control-icon" />
    </div>

    <div class="mix-visualizer-control" role="group" aria-label="Lava heat">
        <RadialKnob Value="@ControlState.LavaHeat"
                    ValueChanged="@OnLavaHeatChanged"
                    Min="0" Max="1" Step="0.001"
                    Size="64"
                    Color="Color.Secondary" />
        <MudIcon Icon="@Icons.Material.Filled.LocalFireDepartment" Size="Size.Small" Class="mix-visualizer-control-icon" />
    </div>

    <div class="mix-visualizer-control" role="group" aria-label="Blob density and size">
        <RadialKnob Value="@ControlState.BlobDensity"
                    ValueChanged="@OnBlobDensityChanged"
                    Min="0" Max="1" Step="0.001"
                    Size="64"
                    Color="Color.Secondary" />
        <MudIcon Icon="@Icons.Material.Filled.BubbleChart" Size="Size.Small" Class="mix-visualizer-control-icon" />
    </div>

    <div class="mix-visualizer-control" role="group" aria-label="Collision strength">
        <RadialKnob Value="@ControlState.CollisionStrength"
                    ValueChanged="@OnCollisionStrengthChanged"
                    Min="0" Max="1" Step="0.001"
                    Size="64"
                    Color="Color.Secondary" />
        <MudIcon Icon="@Icons.Material.Filled.Compress" Size="Size.Small" Class="mix-visualizer-control-icon" />
    </div>

    <div class="mix-visualizer-control" role="group" aria-label="Waveform width">
        <RadialKnob Value="@ControlState.WaveformWidth"
                    ValueChanged="@OnWaveformWidthChanged"
                    Min="0" Max="1" Step="0.001"
                    Size="64"
                    Color="Color.Secondary" />
        <MudIcon Icon="@Icons.Material.Filled.SettingsEthernet" Size="Size.Small" Class="mix-visualizer-control-icon" />
    </div>

</div>

@code {
    /// <summary>
    /// Whether the knob bar is expanded. Owned by the host page (the lava-lamp toggle button flips it);
    /// drives the CSS open/close transition. When false the bar collapses to zero size in place.
    /// </summary>
    [Parameter] public bool Expanded { get; set; }

    // Each handler mutates its own dedicated property then raises Changed — the bridge re-reads and
    // pushes the affected dial. All values are already normalized [0,1]; the bridge maps scroll speed
    // to a visible time-span and routes the rest straight to the lava/colour dials.

    private void OnScrollSpeedChanged(double value)
    {
        ControlState.ScrollSpeed = value;
        ControlState.NotifyChanged();
    }

    private void OnGradientRotationSpeedChanged(double value)
    {
        ControlState.GradientRotationSpeed = value;
        ControlState.NotifyChanged();
    }

    private void OnLavaGravityChanged(double value)
    {
        ControlState.LavaGravity = value;
        ControlState.NotifyChanged();
    }

    private void OnLavaHeatChanged(double value)
    {
        ControlState.LavaHeat = value;
        ControlState.NotifyChanged();
    }

    private void OnBlobDensityChanged(double value)
    {
        ControlState.BlobDensity = value;
        ControlState.NotifyChanged();
    }

    private void OnCollisionStrengthChanged(double value)
    {
        ControlState.CollisionStrength = value;
        ControlState.NotifyChanged();
    }

    private void OnWaveformWidthChanged(double value)
    {
        ControlState.WaveformWidth = value;
        ControlState.NotifyChanged();
    }
}