#if HAVE_NODECANVAS

using System;

using ParadoxNotion.Design;
using NodeCanvas.Framework;

using CanvasGroup = UnityEngine.CanvasGroup;

namespace Framework.UI {

  /// <summary>Changes the alpha value of a CanvasGroup (UGUI)</summary>
  [Category("UI")]
  [Description("Change the alpha value of a CanvasGroup (UGUI)")]
  public class SetCanvasGroupAlphaTask : ActionTask {

    /// <summary>Canvas group that will be faded</summary>
    [RequiredField]
    public BBParameter<CanvasGroup> CanvasToChange;

    /// <summary>Opacity level that will be assigned to the CanvasGroup</summary>
    public float Opacity = 0.5f;

    /// <summary>Provides a summary description for the task</summary>
    protected override string info {
      get {
        return
          "Set " + this.CanvasToChange.ToString() +
          " alpha to " + this.Opacity.ToString("0.0");
      }
    }

    /// <summary>Called once when the action is executed</summary>
    protected override void OnExecute() {
      if(this.CanvasToChange.value != null) {
        this.CanvasToChange.value.alpha = this.Opacity;
      }

      EndAction();
    }

  }

} // namespace Framework.UI

#endif // HAVE_NODECANVAS