special context-aware drop-downs for custom blocks

HISTORY.md

@@ -12,10 +12,11 @@
     * new "object" reporter in the Sensing category for getting a sprite by its name
     * blocks for changing and querying the "flat line ends" setting 
     * selectors for changing and querying "draggable" and "rotation style" settings
+    * special context-aware drop-downs for custom blocks
     * multi-line and monospaced "code" input slots for custom blocks
     * new "string" library, thanks, Brian
     * added "neg" selector to monadic function reporter in "Operators" category
-    * enhances support for embedding Snap in other website, thanks, Bernat!
+    * enhanced support for embedding Snap in other website, thanks, Bernat!
     * export sounds
 * Notable Changes:
     * added third hsv dimension to pen colors, changed SET and CHANGE pen blocks
@@ -35,6 +36,9 @@
     * Greek, thanks, Alexandros!
     * German
 
+### 2019-02-04
+* BYOB: new experimental feature: special context-aware drop-down menus for custom blocks
+
 ### 2019-02-01
 * BYOB: new experimental feature: special multi-line and monospaced input slot types
 

snap.html

@@ -12,7 +12,7 @@
         <script type="text/javascript" src="src/gui.js?version=2019-01-28"></script>
         <script type="text/javascript" src="src/paint.js?version=2018-10-02"></script>
         <script type="text/javascript" src="src/lists.js?version=2019-01-10"></script>
-        <script type="text/javascript" src="src/byob.js?version=2019-02-01"></script>
+        <script type="text/javascript" src="src/byob.js?version=2019-02-04"></script>
         <script type="text/javascript" src="src/tables.js?version=2018-10-02"></script>
         <script type="text/javascript" src="src/symbols.js?version=2019-01-14"></script>
         <script type="text/javascript" src="src/sketch.js?version=2018-10-02"></script>

src/byob.js

@@ -108,7 +108,7 @@ BooleanSlotMorph, XML_Serializer, SnapTranslator*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.byob = '2019-February-01';
+modules.byob = '2019-February-04';
 
 // Declarations
 
@@ -317,8 +317,15 @@ CustomBlockDefinition.prototype.inputOptionsOfIdx = function (idx) {
 };
 
 CustomBlockDefinition.prototype.dropDownMenuOf = function (inputName) {
+    var fname;
     if (this.declarations.has(inputName) &&
             this.declarations.get(inputName)[2]) {
+        if ( (this.declarations.get(inputName)[2].indexOf('§_') === 0)) {
+            fname = this.declarations.get(inputName)[2].slice(2);
+            if (fname !== 'dir') {
+                return fname;
+            }
+        }
         return this.parseChoices(this.declarations.get(inputName)[2]);
     }
     return null;
@@ -3439,6 +3446,10 @@ InputSlotDialogMorph.prototype.setSlotArity = function (arity) {
     this.edit();
 };
 
+InputSlotDialogMorph.prototype.setSlotOptions = function (text) {
+    this.fragment.options = text;
+};
+
 InputSlotDialogMorph.prototype.addSlotTypeButton = function (
     label,
     spec // slot spec or array of specs (I *hate* the arrow symbol, -Jens)
@@ -3635,6 +3646,7 @@ InputSlotDialogMorph.prototype.addSlotsMenu = function () {
                          }
             );
             menu.addLine();
+            menu.addMenu('menu', myself.specialOptionsMenu());
             menu.addMenu('special', myself.specialSlotsMenu());
             return menu;
         }
@@ -3680,6 +3692,31 @@ InputSlotDialogMorph.prototype.specialSlotsMenu = function () {
     return menu;
 };
 
+InputSlotDialogMorph.prototype.specialOptionsMenu = function () {
+    var menu = new MenuMorph(this.setSlotOptions, null, this),
+        myself = this,
+        on = '\u2611 ',
+        off = '\u2610 ';
+
+    function addSpecialOptions(label, selector) {
+        menu.addItem(
+            (myself.fragment.options === selector ?
+                    on : off) + localize(label),
+            selector
+        );
+    }
+
+    addSpecialOptions('messages', '§_messagesReceivedMenu');
+    addSpecialOptions('objects', '§_objectsMenu');
+    // addSpecialOptions('data types', '§_typesMenu');
+    addSpecialOptions('costumes', '§_costumesMenu');
+    addSpecialOptions('sounds', '§_soundsMenu');
+    addSpecialOptions('variables', '§_getVarNamesDict');
+    addSpecialOptions('piano keyboard', '§_pianoKeyboardMenu');
+    addSpecialOptions('360° dial', '§_dir');
+    return menu;
+};
+
 // InputSlotDialogMorph hiding and showing:
 
 /*