made "shown?" attribute inheritable

HISTORY.md

@@ -86,7 +86,8 @@
     * French
 
 ### 2019-06-02
-* Objects, store: made "pen down?" and "shown?" attributes watchable onstage
+* Objects, Store: made "pen down?" and "shown?" attributes watchable onstage
+* Objects, Blocks: made "shown?" attribute inheritable 
 
 ### 2019-06-01
 * Objects: new "pen down?" predicate

snap.html

@@ -6,7 +6,7 @@
         <link rel="shortcut icon" href="src/favicon.ico">
         <script type="text/javascript" src="src/morphic.js?version=2019-05-21"></script>
         <script type="text/javascript" src="src/widgets.js?version=2019-04-05"></script>
-        <script type="text/javascript" src="src/blocks.js?version=2019-05-29"></script>
+        <script type="text/javascript" src="src/blocks.js?version=2019-06-02"></script>
         <script type="text/javascript" src="src/threads.js?version=2019-05-31"></script>
         <script type="text/javascript" src="src/objects.js?version=2019-06-02"></script>
         <script type="text/javascript" src="src/gui.js?version=2019-05-29"></script>

src/blocks.js

@@ -148,7 +148,7 @@ CustomCommandBlockMorph, SymbolMorph, ToggleButtonMorph, DialMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2019-May-29';
+modules.blocks = '2019-June-02';
 
 var SyntaxElementMorph;
 var BlockMorph;
@@ -2776,7 +2776,8 @@ BlockMorph.prototype.userMenu = function () {
                     getScale: 'size',
                     getCostumeIdx: 'costume #',
                     getVolume: 'volume',
-                    getPan: 'balance'
+                    getPan: 'balance',
+                    reportShown: 'shown?'
                 }[this.selector];
                 if (field && rcvr && rcvr.exemplar) {
                     menu.addLine();

src/objects.js

@@ -128,6 +128,7 @@ SpriteMorph.prototype.attributes =
         'volume',
         'balance',
         'sounds',
+        'shown?',
         'scripts'
     ];
 
@@ -2197,7 +2198,7 @@ SpriteMorph.prototype.blockTemplates = function (category) {
         blocks.push(block('show'));
         blocks.push(block('hide'));
         blocks.push(watcherToggle('reportShown'));
-        blocks.push(block('reportShown'));
+        blocks.push(block('reportShown', this.inheritsAttribute('shown?')));
         blocks.push('-');
         blocks.push(block('goToLayer'));
         blocks.push(block('goBack'));
@@ -4039,17 +4040,41 @@ SpriteMorph.prototype.corpsify = function () {
     nested parts.
 */
 
-SpriteMorph.prototype.hide = function () {
+SpriteMorph.prototype.show = function () {
-    SpriteMorph.uber.hide.call(this);
+    this.setVisibility(true);
-    this.parts.forEach(function (part) {part.hide(); });
 };
 
-SpriteMorph.prototype.show = function () {
+SpriteMorph.prototype.hide = function () {
-    SpriteMorph.uber.show.call(this);
+    this.setVisibility(false);
-    this.parts.forEach(function (part) {part.show(); });
+};
+
+SpriteMorph.prototype.setVisibility = function (bool, noShadow) {
+    if (bool) {
+        SpriteMorph.uber.show.call(this);
+    } else {
+        SpriteMorph.uber.hide.call(this);
+    }
+
+    // progagate to parts
+    this.parts.forEach(function (part) {part.setVisibility(bool); });
+
+    // propagate to children that inherit my visibility
+    if (!noShadow) {
+        this.shadowAttribute('shown?');
+    }
+    this.instances.forEach(function (instance) {
+        if (instance.cachedPropagation) {
+            if (instance.inheritsAttribute('shown?')) {
+                instance.setVisibility(bool, true);
+            }
+        }
+    });
 };
 
 SpriteMorph.prototype.reportShown = function () {
+    if (this.inheritsAttribute('shown?')) {
+        return this.exemplar.reportShown();
+    }
     return this.isVisible;
 };
 
@@ -6184,7 +6209,8 @@ SpriteMorph.prototype.updatePropagationCache = function () {
             'size',
             'costume #',
             'volume',
-            'balance'
+            'balance',
+            'shown?'
         ],
         function (att) {
             return contains(myself.inheritedAttributes, att);
@@ -6308,6 +6334,10 @@ SpriteMorph.prototype.refreshInheritedAttribute = function (aName) {
         this.cachedPropagation = true;
         this.setVolume(this.getVolume(), true);
         break;
+    case 'shown?':
+        this.cachedPropagation = true;
+        this.setVisibility(this.reportShown(), true);
+        break;
     case 'balance':
         this.cachedPropagation = true;
         this.setPan(this.getPan(), true);
@@ -10753,7 +10783,8 @@ WatcherMorph.prototype.update = function () {
                 getCostumeIdx: 'costume #',
                 getScale: 'size',
                 getVolume: 'volume',
-                getPan: 'balance'
+                getPan: 'balance',
+                reportShown: 'shown?'
             } [this.getter];
             isGhosted = att ? this.target.inheritsAttribute(att) : false;
         }