262 lines
8.6 KiB
C#
262 lines
8.6 KiB
C#
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using UnityEngine;
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using UnityEngine.UI;
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using UnityEngine.Events;
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using UnityEngine.EventSystems;
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using Lean.Transition;
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using Lean.Common;
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namespace Lean.Gui
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{
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/// <summary>This component allows you to drag the specified RectTransform when you drag on this UI element.</summary>
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[RequireComponent(typeof(RectTransform))]
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[HelpURL(LeanGui.HelpUrlPrefix + "LeanDrag")]
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[AddComponentMenu(LeanGui.ComponentMenuPrefix + "Drag")]
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public class LeanDrag : LeanSelectable, IBeginDragHandler, IDragHandler, IEndDragHandler
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{
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/// <summary>If you want a different RectTransform to be moved while dragging on this UI element, then specify it here. This allows you to turn the current UI element into a drag handle.</summary>
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public RectTransform Target { set { target = value; } get { return target; } } [SerializeField] private RectTransform target;
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/// <summary>Should you be able to drag horizontally?</summary>
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public bool Horizontal { set { horizontal = value; } get { return horizontal; } } [SerializeField] private bool horizontal = true;
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/// <summary>Should you be able to drag vertically?</summary>
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public bool Vertical { set { vertical = value; } get { return vertical; } } [SerializeField] private bool vertical = true;
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/// <summary>This allows you to perform a transition when this element begins being dragged.
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/// You can create a new transition GameObject by right clicking the transition name, and selecting <b>Create</b>.
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/// For example, the <b>Graphic.color Transition (LeanGraphicColor)</b> component can be used to change the color.
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/// NOTE: Any transitions you perform here must be reverted in the <b>Normal Transitions</b> setting using a matching transition component.</summary>
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public LeanPlayer BeginTransitions { get { if (beginTransitions == null) beginTransitions = new LeanPlayer(); return beginTransitions; } } [SerializeField] private LeanPlayer beginTransitions;
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/// <summary>This allows you to perform a transition when this element ends being dragged.
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/// You can create a new transition GameObject by right clicking the transition name, and selecting <b>Create</b>.
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/// For example, the <b>Graphic.color Transition (LeanGraphicColor)</b> component can be used to change the color.</summary>
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public LeanPlayer EndTransitions { get { if (endTransitions == null) endTransitions = new LeanPlayer(); return endTransitions; } } [SerializeField] private LeanPlayer endTransitions;
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/// <summary>This allows you to perform an actions when this element begins being dragged.</summary>
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public UnityEvent OnBegin { get { if (onBegin == null) { onBegin = new UnityEvent(); } return onBegin; } } [SerializeField] private UnityEvent onBegin;
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/// <summary>This allows you to perform an actions when this element ends being dragged.</summary>
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public UnityEvent OnEnd { get { if (onEnd == null) { onEnd = new UnityEvent(); } return onEnd; } } [SerializeField] private UnityEvent onEnd;
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/// <summary>This will return true if the mouse/finger is currently dragging this UI element.</summary>
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public bool Dragging
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{
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get
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{
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return dragging;
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}
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}
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// Is this element currently being dragged?
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[System.NonSerialized]
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protected bool dragging;
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[System.NonSerialized]
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private Vector2 startOffset;
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[System.NonSerialized]
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private Vector2 currentPosition;
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[System.NonSerialized]
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private RectTransform cachedRectTransform;
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[System.NonSerialized]
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private bool cachedRectTransformSet;
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public RectTransform TargetTransform
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{
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get
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{
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if (target != null)
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{
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return target;
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}
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if (cachedRectTransformSet == false)
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{
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cachedRectTransform = GetComponent<RectTransform>();
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cachedRectTransformSet = true;
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}
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return cachedRectTransform;
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}
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}
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public void OnBeginDrag(PointerEventData eventData)
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{
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// Only allow dragging if certain conditions are met
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if (MayDrag(eventData) == true)
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{
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var vector = default(Vector2);
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var target = TargetTransform;
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// Is this pointer inside this rect transform?
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if (RectTransformUtility.ScreenPointToLocalPointInRectangle(target, eventData.position, eventData.pressEventCamera, out vector) == true)
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{
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dragging = true;
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currentPosition = target.anchoredPosition;
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if (beginTransitions != null)
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{
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beginTransitions.Begin();
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}
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if (onBegin != null)
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{
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onBegin.Invoke();
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}
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}
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}
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}
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public virtual void OnDrag(PointerEventData eventData)
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{
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// Only drag if OnBeginDrag was successful
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if (dragging == true)
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{
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// Only allow dragging if certain conditions are met
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if (MayDrag(eventData) == true)
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{
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var oldVector = default(Vector2);
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var target = TargetTransform;
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// Get the previous pointer position relative to this rect transform
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if (RectTransformUtility.ScreenPointToLocalPointInRectangle(target, eventData.position - eventData.delta, eventData.pressEventCamera, out oldVector) == true)
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{
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var newVector = default(Vector2);
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// Get the current pointer position relative to this rect transform
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if (RectTransformUtility.ScreenPointToLocalPointInRectangle(target, eventData.position, eventData.pressEventCamera, out newVector) == true)
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{
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var anchoredPosition = target.anchoredPosition;
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currentPosition += (Vector2)(target.localRotation * (newVector - oldVector));
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if (horizontal == true)
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{
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anchoredPosition.x = currentPosition.x;
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}
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if (vertical == true)
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{
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anchoredPosition.y = currentPosition.y;
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}
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// Offset the anchored position by the difference
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target.anchoredPosition = anchoredPosition;
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}
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}
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}
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}
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}
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public void OnEndDrag(PointerEventData eventData)
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{
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dragging = false;
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if (endTransitions != null)
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{
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endTransitions.Begin();
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}
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if (onEnd != null)
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{
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onEnd.Invoke();
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}
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}
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protected override void Start()
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{
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base.Start();
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transition = Transition.None;
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interactable = true;
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}
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protected override void OnEnable()
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{
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base.OnEnable();
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LeanGui.OnDraggingCheck += DraggingCheck;
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}
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protected override void OnDisable()
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{
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base.OnDisable();
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LeanGui.OnDraggingCheck -= DraggingCheck;
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}
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private void DraggingCheck(ref bool check)
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{
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if (dragging == true)
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{
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check = true;
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}
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}
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private bool MayDrag(PointerEventData eventData)
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{
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return IsActive() && IsInteractable();// && eventData.button == PointerEventData.InputButton.Left;
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}
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}
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}
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#if UNITY_EDITOR
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namespace Lean.Gui.Editor
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{
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using TARGET = LeanDrag;
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[UnityEditor.CanEditMultipleObjects]
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[UnityEditor.CustomEditor(typeof(TARGET))]
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public class LeanDrag_Editor : LeanSelectable_Editor
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{
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protected override void DrawSelectableSettings()
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{
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base.DrawSelectableSettings();
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Draw("target", "If you want a different RectTransform to be moved while dragging on this UI element, then specify it here. This allows you to turn the current UI element into a drag handle.");
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Separator();
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Draw("horizontal", "Should you be able to drag horizontally?");
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Draw("vertical", "Should you be able to drag vertically?");
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}
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protected override void DrawSelectableTransitions(bool showUnusedEvents)
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{
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TARGET tgt; TARGET[] tgts; GetTargets(out tgt, out tgts);
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if (showUnusedEvents == true || Any(tgts, t => t.BeginTransitions.IsUsed == true))
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{
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Draw("beginTransitions", "This allows you to perform a transition when this element begins being dragged. You can create a new transition GameObject by right clicking the transition name, and selecting Create. For example, the <b>Graphic.color Transition (LeanGraphicColor)</b> component can be used to change the color.\n\nNOTE: Any transitions you perform here must be reverted in the Normal Transitions setting using a matching transition component.");
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}
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if (showUnusedEvents == true || Any(tgts, t => t.EndTransitions.IsUsed == true))
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{
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Draw("endTransitions", "This allows you to perform a transition when this element ends being dragged. You can create a new transition GameObject by right clicking the transition name, and selecting Create. For example, the <b>Graphic.color Transition (LeanGraphicColor)</b> component can be used to change the color.");
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}
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base.DrawSelectableTransitions(showUnusedEvents);
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}
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protected override void DrawSelectableEvents(bool showUnusedEvents)
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{
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TARGET tgt; TARGET[] tgts; GetTargets(out tgt, out tgts);
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if (showUnusedEvents == true || Any(tgts, t => t.OnBegin.GetPersistentEventCount() > 0))
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{
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Draw("onBegin");
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}
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if (showUnusedEvents == true || Any(tgts, t => t.OnEnd.GetPersistentEventCount() > 0))
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{
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Draw("onEnd");
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}
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base.DrawSelectableEvents(showUnusedEvents);
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}
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}
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}
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#endif
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