allow block-instances to be dragged off from templates in the "export blocks" dialog

HISTORY.md

@@ -24,6 +24,7 @@
     * migrated SEND blocks to be BROADCAST TO blocks
     * "when I receive 'any message'" hat scripts are threadsafe (uninterruptable by other messages)
     * changed the color model for pen/background colors from HSV to HSL
+    * allow block-instances to be dragged off from templates in the "export blocks" and "hide blocks" dialogs
     * new Birdbrain Technology extensions for Finch and Hummingbird, thanks, Kristina and Bambi!
     * retired Leap Motion library
     * display blocks with their error messages for custom blocks, thanks, Michael!
@@ -56,6 +57,7 @@
 * gui: adjusted random color for new sprites to HSL model
 * objects: fixed keyboard entry for script variable getters
 * gui: changed edit project notes to always edit project motes instead of scene notes
+* byob, blocks, gui: allow block-instances to be dragged off from templates in the "export blocks" dialog
 
 ### 2021-11-08
 * objects: renamed some internal color methods

snap.html

@@ -16,14 +16,14 @@
         <script src="src/morphic.js?version=2021-07-09"></script>
         <script src="src/symbols.js?version=2021-03-03"></script>
         <script src="src/widgets.js?version=2021-17-07"></script>
-        <script src="src/blocks.js?version=2021-11-08"></script>
+        <script src="src/blocks.js?version=2021-11-09"></script>
         <script src="src/threads.js?version=2021-11-08"></script>
         <script src="src/objects.js?version=2021-11-09"></script>
         <script src="src/scenes.js?version=2021-10-12"></script>
         <script src="src/gui.js?version=2021-11-09"></script>
         <script src="src/paint.js?version=2021-07-05"></script>
         <script src="src/lists.js?version=2021-07-19"></script>
-        <script src="src/byob.js?version=2021-11-07"></script>
+        <script src="src/byob.js?version=2021-11-09"></script>
         <script src="src/tables.js?version=2021-05-07"></script>
         <script src="src/sketch.js?version=2021-11-03"></script>
         <script src="src/video.js?version=2019-06-27"></script>

src/blocks.js

@@ -160,7 +160,7 @@ CustomCommandBlockMorph, ToggleButtonMorph, DialMorph, SnapExtensions*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2021-November-08';
+modules.blocks = '2021-November-09';
 
 var SyntaxElementMorph;
 var BlockMorph;
@@ -2623,8 +2623,13 @@ BlockMorph.prototype.scriptTarget = function () {
         return ide.currentSprite;
     }
     dlg = this.parentThatIsA(DialogBoxMorph);
-    if (dlg && isSnapObject(dlg.target)){
+    if (dlg) {
-        return dlg.target;
+        if (isSnapObject(dlg.target)) {
+            return dlg.target;
+        }
+        if (dlg.target instanceof IDE_Morph) {
+            return dlg.target.currentSprite;
+        }
     }
     throw new Error('script target cannot be found for orphaned block');
 };

src/byob.js

@@ -110,7 +110,7 @@ WatcherMorph, XML_Serializer, SnapTranslator, SnapExtensions*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.byob = '2021-November-07';
+modules.byob = '2021-November-09';
 
 // Declarations
 
@@ -4140,11 +4140,11 @@ BlockExportDialogMorph.prototype.key = 'blockExport';
 
 // BlockExportDialogMorph instance creation:
 
-function BlockExportDialogMorph(serializer, blocks) {
+function BlockExportDialogMorph(serializer, blocks, target) {
-    this.init(serializer, blocks);
+    this.init(serializer, blocks, target);
 }
 
-BlockExportDialogMorph.prototype.init = function (serializer, blocks) {
+BlockExportDialogMorph.prototype.init = function (serializer, blocks, target) {
     // additional properties:
     this.serializer = serializer;
     this.blocks = blocks.slice(0);
@@ -4153,7 +4153,7 @@ BlockExportDialogMorph.prototype.init = function (serializer, blocks) {
     // initialize inherited properties:
     BlockExportDialogMorph.uber.init.call(
         this,
-        null, // target
+        target, // target
         () => this.exportBlocks(),
         null // environment
     );
@@ -4208,7 +4208,7 @@ BlockExportDialogMorph.prototype.buildContents = function () {
                     () => contains(this.blocks, definition),
                     null,
                     null,
-                    block.fullImage()
+                    this.target ? block : block.fullImage()
                 );
                 checkBox.setPosition(new Point(
                     x,

src/gui.js

@@ -5134,7 +5134,8 @@ IDE_Morph.prototype.exportGlobalBlocks = function () {
     if (this.stage.globalBlocks.length > 0) {
         new BlockExportDialogMorph(
             this.serializer,
-            this.stage.globalBlocks
+            this.stage.globalBlocks,
+            this
         ).popUp(this.world());
     } else {
         this.inform(