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Editor stuff
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Starpelly
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/// Credit David Gileadi
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/// Sourced from - https://bitbucket.org/UnityUIExtensions/unity-ui-extensions/pull-requests/11
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using System;
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using System.Collections;
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using UnityEngine.Events;
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using UnityEngine.EventSystems;
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namespace UnityEngine.UI.Extensions
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{
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// Stepper control
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[AddComponentMenu("UI/Extensions/Stepper")]
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[RequireComponent(typeof(RectTransform))]
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public class Stepper : UIBehaviour
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{
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private Selectable[] _sides;
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[SerializeField]
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[Tooltip("The current step value of the control")]
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private int _value = 0;
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[SerializeField]
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[Tooltip("The minimum step value allowed by the control. When reached it will disable the '-' button")]
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private int _minimum = 0;
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[SerializeField]
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[Tooltip("The maximum step value allowed by the control. When reached it will disable the '+' button")]
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private int _maximum = 100;
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[SerializeField]
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[Tooltip("The step increment used to increment / decrement the step value")]
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private int _step = 1;
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[SerializeField]
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[Tooltip("Does the step value loop around from end to end")]
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private bool _wrap = false;
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[SerializeField]
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[Tooltip("A GameObject with an Image to use as a separator between segments. Size of the RectTransform will determine the size of the separator used.\nNote, make sure to disable the separator GO so that it does not affect the scene")]
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private Graphic _separator;
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private float _separatorWidth = 0;
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private float separatorWidth
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{
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get
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{
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if (_separatorWidth == 0 && separator)
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{
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_separatorWidth = separator.rectTransform.rect.width;
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var image = separator.GetComponent<Image>();
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if (image)
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_separatorWidth /= image.pixelsPerUnit;
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}
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return _separatorWidth;
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}
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}
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// Event delegates triggered on click.
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[SerializeField]
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private StepperValueChangedEvent _onValueChanged = new StepperValueChangedEvent();
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[Serializable]
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public class StepperValueChangedEvent : UnityEvent<int> { }
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public Selectable[] sides
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{
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get
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{
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if (_sides == null || _sides.Length == 0)
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{
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_sides = GetSides();
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}
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return _sides;
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}
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}
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public int value { get { return _value; } set { _value = value; } }
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public int minimum { get { return _minimum; } set { _minimum = value; } }
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public int maximum { get { return _maximum; } set { _maximum = value; } }
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public int step { get { return _step; } set { _step = value; } }
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public bool wrap { get { return _wrap; } set { _wrap = value; } }
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public Graphic separator { get { return _separator; } set { _separator = value; _separatorWidth = 0; LayoutSides(sides); } }
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public StepperValueChangedEvent onValueChanged
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{
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get { return _onValueChanged; }
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set { _onValueChanged = value; }
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}
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protected Stepper()
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{ }
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#if UNITY_EDITOR
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protected override void OnValidate()
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{
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base.OnValidate();
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RecreateSprites(sides);
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if (separator)
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LayoutSides();
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if (!wrap)
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{
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DisableAtExtremes(sides);
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}
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}
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#endif
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protected override void Start()
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{
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if (isActiveAndEnabled)
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StartCoroutine(DelayedInit());
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}
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protected override void OnEnable()
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{
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StartCoroutine(DelayedInit());
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}
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IEnumerator DelayedInit()
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{
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yield return null;
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RecreateSprites(sides);
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}
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private Selectable[] GetSides()
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{
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var buttons = GetComponentsInChildren<Selectable>();
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if (buttons.Length != 2)
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{
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throw new InvalidOperationException("A stepper must have two Button children");
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}
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if (!wrap)
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{
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DisableAtExtremes(buttons);
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}
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LayoutSides(buttons);
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return buttons;
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}
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public void StepUp()
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{
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Step(step);
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}
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public void StepDown()
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{
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Step(-step);
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}
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private void Step(int amount)
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{
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value += amount;
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if (wrap)
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{
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if (value > maximum) value = minimum;
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if (value < minimum) value = maximum;
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}
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else
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{
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value = Math.Max(minimum, value);
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value = Math.Min(maximum, value);
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DisableAtExtremes(sides);
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}
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_onValueChanged.Invoke(value);
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}
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private void DisableAtExtremes(Selectable[] sides)
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{
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sides[0].interactable = wrap || value > minimum;
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sides[1].interactable = wrap || value < maximum;
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}
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private void RecreateSprites(Selectable[] sides)
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{
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for (int i = 0; i < 2; i++)
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{
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if (sides[i].image == null)
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continue;
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var sprite = CutSprite(sides[i].image.sprite, i == 0);
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var side = sides[i].GetComponent<StepperSide>();
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if (side)
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{
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side.cutSprite = sprite;
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}
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sides[i].image.overrideSprite = sprite;
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}
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}
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static internal Sprite CutSprite(Sprite sprite, bool leftmost)
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{
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if (sprite.border.x == 0 || sprite.border.z == 0)
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return sprite;
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var rect = sprite.rect;
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var border = sprite.border;
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if (leftmost)
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{
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rect.xMax = border.z;
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border.z = 0;
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}
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else
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{
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rect.xMin = border.x;
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border.x = 0;
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}
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return Sprite.Create(sprite.texture, rect, sprite.pivot, sprite.pixelsPerUnit, 0, SpriteMeshType.FullRect, border);
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}
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public void LayoutSides(Selectable[] sides = null)
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{
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sides = sides ?? this.sides;
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RecreateSprites(sides);
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RectTransform transform = this.transform as RectTransform;
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float width = (transform.rect.width / 2) - separatorWidth;
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for (int i = 0; i < 2; i++)
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{
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float insetX = i == 0 ? 0 : width + separatorWidth;
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var rectTransform = sides[i].GetComponent<RectTransform>();
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rectTransform.anchorMin = Vector2.zero;
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rectTransform.anchorMax = Vector2.zero;
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rectTransform.SetInsetAndSizeFromParentEdge(RectTransform.Edge.Left, insetX, width);
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rectTransform.SetInsetAndSizeFromParentEdge(RectTransform.Edge.Top, 0, transform.rect.height);
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// TODO: maybe adjust text position
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}
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if (separator)
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{
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var sepTransform = gameObject.transform.Find("Separator");
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Graphic sep = (sepTransform != null) ? sepTransform.GetComponent<Graphic>() : (GameObject.Instantiate(separator.gameObject) as GameObject).GetComponent<Graphic>();
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sep.gameObject.name = "Separator";
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sep.gameObject.SetActive(true);
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sep.rectTransform.SetParent(this.transform, false);
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sep.rectTransform.anchorMin = Vector2.zero;
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sep.rectTransform.anchorMax = Vector2.zero;
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sep.rectTransform.SetInsetAndSizeFromParentEdge(RectTransform.Edge.Left, width, separatorWidth);
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sep.rectTransform.SetInsetAndSizeFromParentEdge(RectTransform.Edge.Top, 0, transform.rect.height);
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}
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}
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}
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}
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