From 26c05a44b1f35fe4cf0db6ecc1401a9a7f27be9e Mon Sep 17 00:00:00 2001
From: "Zheng, Lei" <realthunder.dev@gmail.com>
Date: Wed, 29 May 2019 13:15:47 +0800
Subject: [PATCH] constraint: optimize toolbar button status update

---
 constraint.py | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/constraint.py b/constraint.py
index b5ff19e..82860d3 100644
--- a/constraint.py
+++ b/constraint.py
@@ -426,6 +426,7 @@ class ConstraintCommand:
         return self._active
 
     def onSelectionChange(self,hasSelection):
+        Constraint._selInfo = None
         self._active = None if hasSelection else False
 
 class Constraint(ProxyType):
@@ -434,6 +435,7 @@ class Constraint(ProxyType):
     _typeID = '_ConstraintType'
     _typeEnum = 'ConstraintType'
     _disabled = 'Disabled'
+    _selInfo = None
 
     @classmethod
     def register(mcs,cls):
@@ -781,8 +783,11 @@ class Base(with_metaclass(Constraint, object)):
     @classmethod
     def checkActive(cls):
         from .assembly import AsmConstraint
-        info = guilogger.catchTrace('selection "{}" exception'.format(
-                cls.getName()), AsmConstraint.getSelection, cls._id)
+        if not Constraint._selInfo:
+            Constraint._selInfo = guilogger.catchTrace(
+                    'selection "{}" exception'.format(
+                        cls.getName()), AsmConstraint.getSelection, cls._id)
+        info = Constraint._selInfo
         if not info:
             return False
         if cls._activeWithElement and not info.Elements: