feat: Add support for displaying contextual menus on icons

packages/blockly/core/block_svg.ts

@@ -1126,7 +1126,9 @@ export class BlockSvg
       if (this.isDeadOrDying()) return;
       const gesture = this.workspace.getGesture(e);
       if (gesture) {
+        this.bringToFront();
         gesture.setStartIcon(icon);
+        getFocusManager().focusNode(icon);
       }
     };
   }

packages/blockly/core/gesture.ts

@@ -764,7 +764,12 @@ export class Gesture {
     this.setStartWorkspace(ws);
     this.mostRecentEvent = e;
 
-    if (!this.targetBlock && !this.startBubble && !this.startComment) {
+    if (
+      !this.targetBlock &&
+      !this.startBubble &&
+      !this.startComment &&
+      !this.startIcon
+    ) {
       // Ensure the workspace is selected if nothing else should be. Note that
       // this is focusNode() instead of focusTree() because if any active node
       // is focused in the workspace it should be defocused.
@@ -1009,8 +1014,9 @@ export class Gesture {
    * @internal
    */
   setStartBlock(block: BlockSvg) {
-    // If the gesture already went through a bubble, don't set the start block.
-    if (!this.startBlock && !this.startBubble) {
+    // If the gesture already went through a block child, don't set the start
+    // block.
+    if (!this.startBlock && !this.startBubble && !this.startIcon) {
       this.startBlock = block;
       if (block.isInFlyout && block !== block.getRootBlock()) {
         this.setTargetBlock(block.getRootBlock());

packages/blockly/core/icons/icon.ts

@@ -7,6 +7,7 @@
 import type {Block} from '../block.js';
 import type {BlockSvg} from '../block_svg.js';
 import * as browserEvents from '../browser_events.js';
+import type {IContextMenu} from '../interfaces/i_contextmenu.js';
 import type {IFocusableTree} from '../interfaces/i_focusable_tree.js';
 import {hasBubble} from '../interfaces/i_has_bubble.js';
 import type {IIcon} from '../interfaces/i_icon.js';
@@ -26,7 +27,7 @@ import type {IconType} from './icon_types.js';
  * block (such as warnings or comments) as opposed to fields, which provide
  * "actual" information, related to how a block functions.
  */
-export abstract class Icon implements IIcon {
+export abstract class Icon implements IIcon, IContextMenu {
   /**
    * The position of this icon relative to its blocks top-start,
    * in workspace units.
@@ -196,4 +197,8 @@ export abstract class Icon implements IIcon {
   getSourceBlock(): Block {
     return this.sourceBlock;
   }
+
+  showContextMenu(e: PointerEvent) {
+    (this.getSourceBlock() as BlockSvg).showContextMenu(e);
+  }
 }

packages/blockly/tests/mocha/icon_test.js

@@ -4,13 +4,34 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+import * as Blockly from '../../build/src/core/blockly.js';
 import {assert} from '../../node_modules/chai/index.js';
 import {defineEmptyBlock} from './test_helpers/block_definitions.js';
 import {MockIcon, MockSerializableIcon} from './test_helpers/icon_mocks.js';
 import {
   sharedTestSetup,
   sharedTestTeardown,
 } from './test_helpers/setup_teardown.js';
+import {simulateClick} from './test_helpers/user_input.js';
+
+class TestIcon extends Blockly.icons.Icon {
+  showContextMenu(e) {
+    const menuItems = [
+      {text: 'Test icon menu item', enabled: true, callback: () => {}},
+    ];
+    Blockly.ContextMenu.show(
+      e,
+      menuItems,
+      false,
+      this.getSourceBlock().workspace,
+      this.workspaceLocation,
+    );
+  }
+
+  getType() {
+    new Blockly.icons.IconType('test');
+  }
+}
 
 suite('Icon', function () {
   setup(function () {
@@ -366,4 +387,45 @@ suite('Icon', function () {
       );
     });
   });
+
+  suite('Contextual menus', function () {
+    setup(function () {
+      this.workspace = Blockly.inject('blocklyDiv', {});
+      Blockly.icons.registry.register(
+        new Blockly.icons.IconType('test'),
+        TestIcon,
+      );
+
+      this.block = this.workspace.newBlock('empty_block');
+      this.block.initSvg();
+    });
+
+    test('are shown when icons are right clicked', function () {
+      const icon = new TestIcon(this.block);
+      this.block.addIcon(icon);
+      simulateClick(icon.getFocusableElement(), {button: 2});
+
+      const menu = document.querySelector('.blocklyContextMenu');
+      assert.isNotNull(menu);
+      assert.isTrue(menu.innerText.includes('Test icon menu item'));
+    });
+
+    test('default to the contextual menu of the parent block', function () {
+      this.block.setCommentText('hello there');
+      const icon = this.block.getIcon(Blockly.icons.IconType.COMMENT);
+      simulateClick(icon.getFocusableElement(), {button: 2});
+
+      const expectedItems =
+        Blockly.ContextMenuRegistry.registry.getContextMenuOptions({
+          block: this.block,
+        });
+
+      assert.isNotEmpty(expectedItems);
+      const menu = document.querySelector('.blocklyContextMenu');
+      for (const item of expectedItems) {
+        if (!item.text) continue;
+        assert.isTrue(menu.innerText.includes(item.text));
+      }
+    });
+  });
 });