Custom block inheritance, highly experimental and under construction

byob.js

@@ -108,7 +108,7 @@ BooleanSlotMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.byob = '2017-January-24';
+modules.byob = '2017-February-02';
 
 // Declarations
 
@@ -734,7 +734,7 @@ CustomCommandBlockMorph.prototype.mouseClickLeft = function () {
 };
 
 CustomCommandBlockMorph.prototype.edit = function () {
-    var myself = this, editor, block, hat;
+    var myself = this, editor, block, hat, rcvr;
 
     if (this.isPrototype) {
         block = this.definition.blockInstance();
@@ -759,6 +759,16 @@ CustomCommandBlockMorph.prototype.edit = function () {
             myself.isInUse()
         );
     } else {
+        // checking for custom block inheritance, highly experimental
+        rcvr = this.receiver();
+        if (rcvr && contains(
+                Object.keys(rcvr.inheritedBlocks()),
+                this.definition.blockSpec()
+            )
+        ) {
+            this.duplicateBlockDefinition();
+            return;
+        }
         Morph.prototype.trackChanges = false;
         editor = new BlockEditorMorph(this.definition, this.receiver());
         editor.popUp();
@@ -932,16 +942,17 @@ CustomCommandBlockMorph.prototype.exportBlockDefinition = function () {
 };
 
 CustomCommandBlockMorph.prototype.duplicateBlockDefinition = function () {
-    var dup = this.definition.copyAndBindTo(this.receiver),
+    var rcvr = this.receiver(),
+        dup = this.definition.copyAndBindTo(rcvr),
         ide = this.parentThatIsA(IDE_Morph);
     if (this.definition.isGlobal) {
         ide.stage.globalBlocks.push(dup);
     } else {
-        this.definition.receiver.customBlocks.push(dup);
+        rcvr.customBlocks.push(dup);
     }
     ide.flushPaletteCache();
     ide.refreshPalette();
-    new BlockEditorMorph(dup, this.definition.receiver).popUp();
+    new BlockEditorMorph(dup, rcvr).popUp();
 };
 
 CustomCommandBlockMorph.prototype.deleteBlockDefinition = function () {

history.txt

@@ -3349,3 +3349,7 @@ Fixes:
 170201
 ------
 * GUI: let costume icons indicate svg costumes 
+
+170202
+------
+* Objects, BYOB: highly experimental custom block inheritance, under construction…

objects.js

@@ -82,7 +82,7 @@ SpeechBubbleMorph, RingMorph, isNil, FileReader, TableDialogMorph,
 BlockEditorMorph, BlockDialogMorph, PrototypeHatBlockMorph, localize,
 TableMorph, TableFrameMorph, normalizeCanvas, BooleanSlotMorph*/
 
-modules.objects = '2017-January-27';
+modules.objects = '2017-February-02';
 
 var SpriteMorph;
 var StageMorph;
@@ -2417,6 +2417,28 @@ SpriteMorph.prototype.freshPalette = function (category) {
         }
     });
 
+    // inherited custom blocks: (under construction...)
+    // y += unit * 1.6;
+    if (this.exemplar) {
+        this.inheritedBlocks(true).forEach(function (definition) {
+            var block;
+            if (definition.category === category ||
+                    (category === 'variables'
+                        && contains(
+                            ['lists', 'other'],
+                            definition.category
+                        ))) {
+                block = definition.templateInstance();
+                y += unit * 0.3;
+                block.setPosition(new Point(x, y));
+                palette.addContents(block);
+                block.ghost();
+                x = 0;
+                y += block.height();
+            }
+        });
+    }
+
     //layout
 
     palette.scrollX(palette.padding);
@@ -4422,6 +4444,25 @@ SpriteMorph.prototype.reportThreadCount = function () {
     return 0;
 };
 
+// SpriteMorph variable refactoring
+
+SpriteMorph.prototype.refactorVariableInstances = function (
+    oldName,
+    newName,
+    isGlobal
+) {
+    if (isGlobal && this.hasSpriteVariable(oldName)) {
+        return;
+    }
+
+    this.scripts.children.forEach(function (child) {
+        if (child instanceof BlockMorph) {
+            child.refactorVarInStack(oldName, newName);
+        }
+    });
+
+};
+
 // SpriteMorph variable watchers (for palette checkbox toggling)
 
 SpriteMorph.prototype.findVariableWatcher = function (varName) {
@@ -4887,29 +4928,8 @@ SpriteMorph.prototype.hasSpriteVariable = function (varName) {
     return contains(this.variables.names(), varName);
 };
 
-// Variable refactoring
-
-SpriteMorph.prototype.refactorVariableInstances = function (
-    oldName,
-    newName,
-    isGlobal
-) {
-    if (isGlobal && this.hasSpriteVariable(oldName)) {
-        return;
-    }
-
-    this.scripts.children.forEach(function (child) {
-        if (child instanceof BlockMorph) {
-            child.refactorVarInStack(oldName, newName);
-        }
-    });
-
-};
-
 // SpriteMorph inheritance - custom blocks
-
-/*
-// under construction, commented out for now
+// under construction
 
 SpriteMorph.prototype.ownBlocks = function () {
     var dict = {};
@@ -4951,8 +4971,6 @@ SpriteMorph.prototype.inheritedBlocks = function (valuesOnly) {
     return dict;
 };
 
-*/
-
 // SpriteMorph thumbnail
 
 SpriteMorph.prototype.thumbnail = function (extentPoint) {