Panel Control

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class ModifierPanel : MonoBehaviour {

    public bool PanelOpen;
    public bool ForceClose;
    public bool FinishedClosing;

    public AnimationCurve PositionCurve;
    public AnimationCurve AlphaCurve;
    float Transition;

    public GameObject Orienation;
    public GameObject Direction;
    public GameObject Spin;
    public GameObject Power;

    public bool UsesOrientation;
    public bool UsesDirection;
    public bool UsesSpin;
    public bool UsesPower;

    int NumberUsed;
    int PreviousUsed;
    float start;
    float end;

    public float ButtonSize;
    RectTransform RT;

    void Start ()
    {
        RT = gameObject.GetComponent<RectTransform>();
        // Start position is the initial location subtracted by its width.
        start = RT.anchoredPosition.x - RT.rect.width;
        PositionCurve.MoveKey(0, new Keyframe(0, start));
    }

    void Update ()
    {
        // See if any of the buttons are in use.
        NumberUsed = 0;
        if (UsesOrientation)
            NumberUsed++;
        if (UsesDirection)
            NumberUsed++;
        if (UsesSpin)
            NumberUsed++;
        if (UsesPower)
            NumberUsed++;

        // If the number of buttons in use changes, close the menu.
        if (NumberUsed != PreviousUsed)
        {
            ForceClose = true;
            PreviousUsed = NumberUsed;
        }
        // If the menu is NOT forced closed and at least one button is in use, open it.
        if (NumberUsed > 0 && !ForceClose)
            PanelOpen = true;
        // PanelOpen is what controls the panel animation.
        // Disable it so the panel actually closes.
        if (ForceClose)
            PanelOpen = false;

        if (PanelOpen)
        {
            // We only update these variables while the panel is open so they don't change while it's closing to be re-opened.
            Orienation.SetActive(UsesOrientation);
            Direction.SetActive(UsesDirection);
            Spin.SetActive(UsesSpin);
            Power.SetActive(UsesPower);
            HorizontalLayoutGroup LayoutGroup = gameObject.GetComponent<HorizontalLayoutGroup>();
            end = start + (((ButtonSize + LayoutGroup.spacing) * NumberUsed) + LayoutGroup.padding.right);
            PositionCurve.MoveKey(1, new Keyframe(1, end));
        }

        // Control the animation of the panel.
        if (PanelOpen && Transition < 1)
            Transition += Time.deltaTime * 3;
        if (!PanelOpen && Transition > 0)
            Transition -= Time.deltaTime * 3;

        // If the panel was forced closed but is still valid to open, re-open it.
        if (NumberUsed > 0 && Transition <= 0)
            ForceClose = false;

        // Apply animation to the panel itself.
        RT.anchoredPosition = new Vector2(PositionCurve.Evaluate(Transition), RT.anchoredPosition.y);
        CanvasGroup Canvas = gameObject.GetComponent<CanvasGroup>();
        Canvas.alpha = AlphaCurve.Evaluate(Transition);
    }


}