Merge pull request #293 from vidartf/renderer_hold

Hold auto--rerender context manager

Author: vidartf

js/src/core/Renderer.js

@@ -19,6 +19,7 @@ var RendererModel = RenderableModel.extend({
             _model_name: 'RendererModel',
             _antialias: false,
             _alpha: false,
+            _pause_autorender: false,
 
             scene: null,
             camera: null,
@@ -54,7 +55,9 @@ var RendererModel = RenderableModel.extend({
 
     onChildChanged: function(model, options) {
         RenderableModel.prototype.onChildChanged.apply(this, arguments);
-        this.trigger('rerender', this, {});
+        if (!this.get('_pause_autorender')) {
+            this.trigger('rerender', this, {});
+        }
     },
 
 }, {
@@ -160,7 +163,9 @@ var RendererView = RenderableView.extend({
     },
 
     update: function() {
-        this.tick();
+        if (!this.model.get('_pause_autorender')) {
+            this.tick();
+        }
     },
 
     acquireRenderer: function() {

pythreejs/core/Renderer.py

@@ -2,6 +2,7 @@
 """
 
 import six
+from contextlib import contextmanager
 from ipywidgets import widget_serialization
 from traitlets import (
     Unicode, CInt, Instance, Float, Tuple, Undefined, link)
@@ -22,6 +23,7 @@ class Renderer(RenderableWidget):
 
     _view_name = Unicode('RendererView').tag(sync=True)
     _model_name = Unicode('RendererModel').tag(sync=True)
+    _pause_autorender = Bool(False).tag(sync=True)
 
     width = CInt(200)
     height = CInt(200)
@@ -58,6 +60,14 @@ def freeze(self):
         }
         self.send(content)
 
+    @contextmanager
+    def hold(self):
+        self._pause_autorender = True
+        try:
+            yield
+        finally:
+            self._pause_autorender = False
+
 
 if six.PY3:
     from inspect import Signature, Parameter