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BoxSlider.cs
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BoxSlider.cs
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using System;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Events;
using UnityEngine.EventSystems;
namespace SCANsat.Unity.HSVPicker.Utility
{
[AddComponentMenu("UI/BoxSlider", 35)]
[RequireComponent(typeof(RectTransform))]
public class BoxSlider : Selectable, IDragHandler, IInitializePotentialDragHandler, ICanvasElement
{
public enum Direction
{
LeftToRight,
RightToLeft,
BottomToTop,
TopToBottom,
}
[Serializable]
public class BoxSliderEvent : UnityEvent<float, float> { }
[SerializeField]
private RectTransform m_HandleRect;
public RectTransform handleRect { get { return m_HandleRect; } set { if (SetClass(ref m_HandleRect, value)) { UpdateCachedReferences(); UpdateVisuals(); } } }
[Space(6)]
[SerializeField]
private float m_MinValue = 0;
public float minValue { get { return m_MinValue; } set { if (SetStruct(ref m_MinValue, value)) { Set(m_Value); SetY (m_ValueY); UpdateVisuals(); } } }
[SerializeField]
private float m_MaxValue = 1;
public float maxValue { get { return m_MaxValue; } set { if (SetStruct(ref m_MaxValue, value)) { Set(m_Value); SetY (m_ValueY); UpdateVisuals(); } } }
[SerializeField]
private bool m_WholeNumbers = false;
public bool wholeNumbers { get { return m_WholeNumbers; } set { if (SetStruct(ref m_WholeNumbers, value)) { Set(m_Value); SetY (m_ValueY); UpdateVisuals(); } } }
[SerializeField]
private float m_Value = 1f;
public float value
{
get
{
if (wholeNumbers)
return Mathf.Round(m_Value);
return m_Value;
}
set
{
Set(value);
}
}
public float normalizedValue
{
get
{
if (Mathf.Approximately(minValue, maxValue))
return 0;
return Mathf.InverseLerp(minValue, maxValue, value);
}
set
{
this.value = Mathf.Lerp(minValue, maxValue, value);
}
}
[SerializeField]
private float m_ValueY = 1f;
public float valueY
{
get
{
if (wholeNumbers)
return Mathf.Round(m_ValueY);
return m_ValueY;
}
set
{
SetY(value);
}
}
public float normalizedValueY
{
get
{
if (Mathf.Approximately(minValue, maxValue))
return 0;
return Mathf.InverseLerp(minValue, maxValue, valueY);
}
set
{
this.valueY = Mathf.Lerp(minValue, maxValue, value);
}
}
[Space(6)]
// Allow for delegate-based subscriptions for faster events than 'eventReceiver', and allowing for multiple receivers.
[SerializeField]
private BoxSliderEvent m_OnValueChanged = new BoxSliderEvent();
public BoxSliderEvent onValueChanged { get { return m_OnValueChanged; } set { m_OnValueChanged = value; } }
// Private fields
//private Image m_FillImage;
//private Transform m_FillTransform;
//private RectTransform m_FillContainerRect;
private Transform m_HandleTransform;
private RectTransform m_HandleContainerRect;
// The offset from handle position to mouse down position
private Vector2 m_Offset = Vector2.zero;
private DrivenRectTransformTracker m_Tracker;
// Size of each step.
float stepSize { get { return wholeNumbers ? 1 : (maxValue - minValue) * 0.1f; } }
protected BoxSlider()
{ }
#if UNITY_EDITOR
protected override void OnValidate()
{
base.OnValidate();
if (wholeNumbers)
{
m_MinValue = Mathf.Round(m_MinValue);
m_MaxValue = Mathf.Round(m_MaxValue);
}
UpdateCachedReferences();
Set(m_Value, false);
SetY(m_ValueY, false);
// Update rects since other things might affect them even if value didn't change.
UpdateVisuals();
var prefabType = UnityEditor.PrefabUtility.GetPrefabType(this);
if (prefabType != UnityEditor.PrefabType.Prefab && !Application.isPlaying)
CanvasUpdateRegistry.RegisterCanvasElementForLayoutRebuild(this);
}
#endif // if UNITY_EDITOR
public virtual void Rebuild(CanvasUpdate executing)
{
#if UNITY_EDITOR
if (executing == CanvasUpdate.Prelayout)
onValueChanged.Invoke(value, valueY);
#endif
}
public void LayoutComplete()
{
}
public void GraphicUpdateComplete()
{
}
public static bool SetClass<T>(ref T currentValue, T newValue) where T: class
{
if ((currentValue == null && newValue == null) || (currentValue != null && currentValue.Equals(newValue)))
return false;
currentValue = newValue;
return true;
}
public static bool SetStruct<T>(ref T currentValue, T newValue) where T: struct
{
if (currentValue.Equals(newValue))
return false;
currentValue = newValue;
return true;
}
protected override void OnEnable()
{
base.OnEnable();
UpdateCachedReferences();
Set(m_Value, false);
SetY(m_ValueY, false);
// Update rects since they need to be initialized correctly.
UpdateVisuals();
}
protected override void OnDisable()
{
m_Tracker.Clear();
base.OnDisable();
}
void UpdateCachedReferences()
{
if (m_HandleRect)
{
m_HandleTransform = m_HandleRect.transform;
if (m_HandleTransform.parent != null)
m_HandleContainerRect = m_HandleTransform.parent.GetComponent<RectTransform>();
}
else
{
m_HandleContainerRect = null;
}
}
// Set the valueUpdate the visible Image.
void Set(float input)
{
Set(input, true);
}
void Set(float input, bool sendCallback)
{
// Clamp the input
float newValue = Mathf.Clamp(input, minValue, maxValue);
if (wholeNumbers)
newValue = Mathf.Round(newValue);
// If the stepped value doesn't match the last one, it's time to update
if (m_Value == newValue)
return;
m_Value = newValue;
UpdateVisuals();
if (sendCallback)
m_OnValueChanged.Invoke(newValue, valueY);
}
void SetY(float input)
{
SetY(input, true);
}
void SetY(float input, bool sendCallback)
{
// Clamp the input
float newValue = Mathf.Clamp(input, minValue, maxValue);
if (wholeNumbers)
newValue = Mathf.Round(newValue);
// If the stepped value doesn't match the last one, it's time to update
if (m_ValueY == newValue)
return;
m_ValueY = newValue;
UpdateVisuals();
if (sendCallback)
m_OnValueChanged.Invoke(value, newValue);
}
protected override void OnRectTransformDimensionsChange()
{
base.OnRectTransformDimensionsChange();
UpdateVisuals();
}
enum Axis
{
Horizontal = 0,
Vertical = 1
}
// Force-update the slider. Useful if you've changed the properties and want it to update visually.
private void UpdateVisuals()
{
#if UNITY_EDITOR
if (!Application.isPlaying)
UpdateCachedReferences();
#endif
m_Tracker.Clear();
//to business!
if (m_HandleContainerRect != null)
{
m_Tracker.Add(this, m_HandleRect, DrivenTransformProperties.Anchors);
Vector2 anchorMin = Vector2.zero;
Vector2 anchorMax = Vector2.one;
anchorMin[0] = anchorMax[0] = (normalizedValue);
anchorMin[1] = anchorMax[1] = ( normalizedValueY);
m_HandleRect.anchorMin = anchorMin;
m_HandleRect.anchorMax = anchorMax;
}
}
// Update the slider's position based on the mouse.
void UpdateDrag(PointerEventData eventData, Camera cam)
{
RectTransform clickRect = m_HandleContainerRect;
if (clickRect != null && clickRect.rect.size[0] > 0)
{
Vector2 localCursor;
if (!RectTransformUtility.ScreenPointToLocalPointInRectangle(clickRect, eventData.position, cam, out localCursor))
return;
localCursor -= clickRect.rect.position;
float val = Mathf.Clamp01((localCursor - m_Offset)[0] / clickRect.rect.size[0]);
normalizedValue = (val);
float valY = Mathf.Clamp01((localCursor - m_Offset)[1] / clickRect.rect.size[1]);
normalizedValueY = ( valY);
}
}
private bool MayDrag(PointerEventData eventData)
{
return IsActive() && IsInteractable() && eventData.button == PointerEventData.InputButton.Left;
}
public override void OnPointerDown(PointerEventData eventData)
{
if (!MayDrag(eventData))
return;
base.OnPointerDown(eventData);
m_Offset = Vector2.zero;
if (m_HandleContainerRect != null && RectTransformUtility.RectangleContainsScreenPoint(m_HandleRect, eventData.position, eventData.enterEventCamera))
{
Vector2 localMousePos;
if (RectTransformUtility.ScreenPointToLocalPointInRectangle(m_HandleRect, eventData.position, eventData.pressEventCamera, out localMousePos))
m_Offset = localMousePos;
m_Offset.y = -m_Offset.y;
}
else
{
// Outside the slider handle - jump to this point instead
UpdateDrag(eventData, eventData.pressEventCamera);
}
}
public virtual void OnDrag(PointerEventData eventData)
{
if (!MayDrag(eventData))
return;
UpdateDrag(eventData, eventData.pressEventCamera);
}
//public override void OnMove(AxisEventData eventData)
//{
// if (!IsActive() || !IsInteractable())
// {
// base.OnMove(eventData);
// return;
// }
// switch (eventData.moveDir)
// {
// case MoveDirection.Left:
// if (axis == Axis.Horizontal && FindSelectableOnLeft() == null) {
// Set(reverseValue ? value + stepSize : value - stepSize);
// SetY (reverseValue ? valueY + stepSize : valueY - stepSize);
// }
// else
// base.OnMove(eventData);
// break;
// case MoveDirection.Right:
// if (axis == Axis.Horizontal && FindSelectableOnRight() == null) {
// Set(reverseValue ? value - stepSize : value + stepSize);
// SetY(reverseValue ? valueY - stepSize : valueY + stepSize);
// }
// else
// base.OnMove(eventData);
// break;
// case MoveDirection.Up:
// if (axis == Axis.Vertical && FindSelectableOnUp() == null) {
// Set(reverseValue ? value - stepSize : value + stepSize);
// SetY(reverseValue ? valueY - stepSize : valueY + stepSize);
// }
// else
// base.OnMove(eventData);
// break;
// case MoveDirection.Down:
// if (axis == Axis.Vertical && FindSelectableOnDown() == null) {
// Set(reverseValue ? value + stepSize : value - stepSize);
// SetY(reverseValue ? valueY + stepSize : valueY - stepSize);
// }
// else
// base.OnMove(eventData);
// break;
// }
//}
//public override Selectable FindSelectableOnLeft()
//{
// if (navigation.mode == Navigation.Mode.Automatic && axis == Axis.Horizontal)
// return null;
// return base.FindSelectableOnLeft();
//}
//public override Selectable FindSelectableOnRight()
//{
// if (navigation.mode == Navigation.Mode.Automatic && axis == Axis.Horizontal)
// return null;
// return base.FindSelectableOnRight();
//}
//public override Selectable FindSelectableOnUp()
//{
// if (navigation.mode == Navigation.Mode.Automatic && axis == Axis.Vertical)
// return null;
// return base.FindSelectableOnUp();
//}
//public override Selectable FindSelectableOnDown()
//{
// if (navigation.mode == Navigation.Mode.Automatic && axis == Axis.Vertical)
// return null;
// return base.FindSelectableOnDown();
//}
public virtual void OnInitializePotentialDrag(PointerEventData eventData)
{
eventData.useDragThreshold = false;
}
}
}