sbox-public/game/addons/menu/Code/DevUI/Console/LogEventPanel.razor

@namespace Sandbox.UI.Dev
@inherits Panel

<root class="@classes">
    <div class="close" onclick="@Hide"><i>close</i></div>
    <div @ref="Output" class="message" AllowChildSelection="true" AcceptsFocus="true" @onkeypress="KeyPress">
        <div class="text">@message</div>
        <div class="stack">@entry.Stack</div>
    </div>
</root>

@code
{
    LogEvent entry;
    bool visible;

    string classes => $"logeventpanel {(visible?"visible":"hidden")}";
    string message => $"[{entry.Logger}] {entry.Message}";
    Panel Output = default;

    public void Switch( LogEvent e )
    {
        entry = e;
        visible = true;
        StateHasChanged();
        UnselectAllInChildren();
    }

    void Hide()
    {
        visible = false;
        StateHasChanged();
    }

    public override void OnButtonEvent(ButtonEvent e)
    {
        if ( e.HasCtrl && e.Button == "a" && e.Pressed )
        {
            Output.SelectAllInChildren();
        }
    }
}