gracefully hide & show the stage, fixed #281

history.txt

@@ -2155,4 +2155,8 @@ ______
 * Objects: stop replacing the empty string with the number zero in watchers
 * Threads: initialize new variables with zero (instead of null)
 * Objects: fixed #465
-* Threads: fixed #457
+* Objects: fixed #457
+
+140605
+------
+* Objects: gracefully hide & show the stage, fixed #281

objects.js

@@ -125,7 +125,7 @@ PrototypeHatBlockMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.objects = '2014-Jun-05';
+modules.objects = '2014-Jun-06';
 
 var SpriteMorph;
 var StageMorph;
@@ -5191,6 +5191,23 @@ StageMorph.prototype.thumbnail = function (extentPoint, excludedSprite) {
     return trg;
 };
 
+// StageMorph hiding and showing:
+
+/*
+    override the inherited behavior to recursively hide/show all
+    children.
+*/
+
+StageMorph.prototype.hide = function () {
+    this.isVisible = false;
+    this.changed();
+};
+
+StageMorph.prototype.show = function () {
+    this.isVisible = true;
+    this.changed();
+};
+
 // StageMorph cloning overrice
 
 StageMorph.prototype.createClone = nop;