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August 19, 2021 10:27
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Unity 场景拾取可视UI
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using System.Collections.Generic; | |
using UnityEditor; | |
using UnityEngine; | |
using UnityEngine.UI; | |
public class SceneViewPickUI | |
{ | |
[InitializeOnLoadMethod] | |
private static void Initialize() | |
{ | |
SceneView.onSceneGUIDelegate += OnSceneGUIDelegate; | |
} | |
private static void OnSceneGUIDelegate(SceneView sceneView) | |
{ | |
if (!sceneView.in2DMode) | |
{ | |
return; | |
} | |
if (pick == null) | |
{ | |
pick = new SceneViewPickUI(); | |
} | |
pick.OnGUI(); | |
} | |
private const string menuName = "Tools/Pick UI"; | |
[MenuItem(menuName, false, 0)] | |
private static void ShowMenuPick() | |
{ | |
if (pick == null) | |
{ | |
pick = new SceneViewPickUI(); | |
} | |
pick.SetUse(); | |
} | |
private static SceneViewPickUI pick; | |
private bool m_UsePick; | |
private bool m_RectSelecting; | |
private Vector2 m_SelectStartPoint; | |
enum SelectionType { Normal, Additive, Invert } | |
private SceneViewPickUI() | |
{ | |
m_UsePick = EditorPrefs.GetBool("SceneViewPickUI", false); | |
Menu.SetChecked(menuName, m_UsePick); | |
} | |
private void SetUse() | |
{ | |
m_UsePick = !m_UsePick; | |
EditorPrefs.SetBool("SceneViewPickUI", m_UsePick); | |
Menu.SetChecked(menuName, m_UsePick); | |
} | |
private void OnGUI() | |
{ | |
if (!m_UsePick) | |
{ | |
return; | |
} | |
Handles.BeginGUI(); | |
var usePick = GUILayout.Toggle(m_UsePick, "Pick UI"); | |
if (usePick != m_UsePick) | |
{ | |
SetUse(); | |
} | |
Handles.EndGUI(); | |
if (!m_UsePick) | |
{ | |
return; | |
} | |
Event evt = Event.current; | |
Vector2 mousePos = evt.mousePosition; | |
int id = GUIUtility.GetControlID(FocusType.Passive); | |
switch (evt.GetTypeForControl(id)) | |
{ | |
case EventType.Layout: | |
HandleUtility.AddDefaultControl(id); | |
break; | |
case EventType.MouseDown: | |
if (HandleUtility.nearestControl == id && evt.button == 0) | |
{ | |
GUIUtility.hotControl = id; | |
m_SelectStartPoint = mousePos; | |
m_RectSelecting = false; | |
} | |
break; | |
case EventType.MouseDrag: | |
if (GUIUtility.hotControl == id) | |
{ | |
if (!m_RectSelecting && (mousePos - m_SelectStartPoint).magnitude > 6f) | |
{ | |
m_RectSelecting = true; | |
} | |
} | |
break; | |
case EventType.MouseUp: | |
if (GUIUtility.hotControl == id && evt.button == 0) | |
{ | |
GUIUtility.hotControl = 0; | |
if (m_RectSelecting) | |
{ | |
m_RectSelecting = false; | |
} | |
else | |
{ | |
SelectionType selectionType = SelectionType.Normal; | |
if (evt.shift) | |
{ | |
selectionType = SelectionType.Additive; | |
} | |
else if (EditorGUI.actionKey) | |
{ | |
selectionType = SelectionType.Invert; | |
} | |
if (UpdateSelection(selectionType)) | |
{ | |
evt.Use(); | |
} | |
} | |
} | |
break; | |
} | |
} | |
private bool UpdateSelection(SelectionType type) | |
{ | |
var overlapped = new List<GameObject>(); | |
do | |
{ | |
var go = HandleUtility.PickGameObject(Event.current.mousePosition, false, overlapped.ToArray()); | |
if (!go) | |
{ | |
break; | |
} | |
var rt = go.GetComponent<RectTransform>(); | |
if (!rt) | |
{ | |
break; | |
} | |
var mg = go.GetComponent<Graphic>(); | |
if (mg && mg.color.a > 0 // 本身颜色不透明 | |
&& mg.canvasRenderer.materialCount > 0 // 没有禁用组件 | |
&& mg.canvasRenderer.GetInheritedAlpha() > 0 // CanvasGroups 导致的 Alpha 不为0 | |
//&& !go.GetComponent<Empty4Raycast>() // 空网格不选择 | |
) | |
{ | |
//Debug.LogWarning(go, go); | |
switch (type) | |
{ | |
case SelectionType.Additive: | |
{ | |
List<Object> newSelection = new List<Object>(); | |
newSelection.AddRange(Selection.objects); | |
newSelection.Add(go); | |
Selection.objects = newSelection.ToArray(); | |
} | |
break; | |
case SelectionType.Invert: | |
{ | |
List<Object> newSelection = new List<Object>(); | |
newSelection.AddRange(Selection.objects); | |
if (newSelection.Contains(go)) | |
{ | |
newSelection.Remove(go); | |
} | |
else | |
{ | |
newSelection.Add(go); | |
} | |
Selection.objects = newSelection.ToArray(); | |
} | |
break; | |
case SelectionType.Normal: | |
Selection.activeObject = go; | |
break; | |
} | |
return true; | |
} | |
if (overlapped.Count > 0 && overlapped[overlapped.Count - 1] == go) | |
{ | |
break; | |
} | |
overlapped.Add(go); | |
} while (true); | |
return false; | |
} | |
} |
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