the target of a context menu item is now passed as a third optional a…

…rg to `execute`

packages/commands/src/index.ts

@@ -335,13 +335,16 @@ class CommandRegistry {
    *
    * @param args - The arguments for the command.
    *
+   * @param target - (optional) The HTML node on which this command
+   * was invoked.
+   *
    * @returns A promise which resolves with the result of the command.
    *
    * #### Notes
    * The promise will reject if the command throws an exception,
    * or if the command is not registered.
    */
-  execute(id: string, args: ReadonlyJSONObject = JSONExt.emptyObject): Promise<any> {
+  execute(id: string, args: ReadonlyJSONObject = JSONExt.emptyObject, target?: HTMLElement): Promise<any> {
     // Reject if the command is not registered.
     let cmd = this._commands[id];
     if (!cmd) {
@@ -351,7 +354,7 @@ class CommandRegistry {
     // Execute the command and reject if an exception is thrown.
     let value: any;
     try {
-      value = cmd.execute.call(undefined, args);
+      value = cmd.execute.call(undefined, args, target);
     } catch (err) {
       value = Promise.reject(err);
     }
@@ -360,7 +363,7 @@ class CommandRegistry {
     let result = Promise.resolve(value);
 
     // Emit the command executed signal.
-    this._commandExecuted.emit({ id, args, result });
+    this._commandExecuted.emit({ id, args, target, result });
 
     // Return the result promise to the caller.
     return result;
@@ -577,7 +580,7 @@ namespace CommandRegistry {
    * A type alias for a user-defined command function.
    */
   export
-  type CommandFunc<T> = (args: ReadonlyJSONObject) => T;
+  type CommandFunc<T> = (args: ReadonlyJSONObject, target?: HTMLElement) => T;
 
   /**
    * A type alias for a simple immutable string dataset.
@@ -804,6 +807,11 @@ namespace CommandRegistry {
      */
     readonly args: ReadonlyJSONObject;
 
+    /**
+     * The HTML node on which the command was invoked.
+     */
+    readonly target?: HTMLElement;
+
     /**
      * The promise which resolves with the result of the command.
      */

packages/widgets/src/contextmenu.ts

@@ -167,18 +167,6 @@ namespace ContextMenu {
      * The default rank is `Infinity`.
      */
     rank?: number;
-
-    /**
-     * Pass a selected node's dataset to an item's command.
-     *
-     * If this flag is set, when a contextmenu item is matched
-     * to the target of a contextmenu event, the key-value pairs
-     * in `target.dataset` (if present) will be added as
-     * properties of `item.args`.
-     *
-     * Only meaningful for items of type `command`.
-     */
-    passDataset?: boolean;
   }
 }
 
@@ -202,11 +190,6 @@ namespace Private {
      */
     rank: number;
 
-    /**
-     * Pass a selected node's dataset to an item's command.
-     */
-    passDataset: boolean;
-
     /**
      * The tie-breaking id for the item.
      */
@@ -220,8 +203,7 @@ namespace Private {
   function createItem(options: ContextMenu.IItemOptions, id: number): IItem {
     let selector = validateSelector(options.selector);
     let rank = options.rank !== undefined ? options.rank : Infinity;
-    let passDataset = options.passDataset !== undefined ? options.passDataset : false;
-    return { ...options, selector, rank, passDataset, id };
+    return { ...options, selector, rank, id };
   }
 
   /**
@@ -284,10 +266,8 @@ namespace Private {
           continue;
         }
 
-        // Pass the target's dataset to the matched item's args, if requested.
-        if (item.passDataset && 'dataset' in target) {
-          item.args = {...item.args, ...(target as any)['dataset']};
-        }
+        // Store the target for later use by the matching menu item.
+        item.target = target as HTMLElement;
 
         // Add the matched item to the result for this DOM level.
         matches.push(item);

packages/widgets/src/menu.ts

@@ -293,13 +293,16 @@ class Menu extends Widget {
       return;
     }
 
+    // item.target is nulled by the .close(), so grab it now
+    let target = item.target;
+
     // Close the root menu before executing the command.
     this.rootMenu.close();
 
     // Execute the command for the item.
     let { command, args } = item;
     if (this.commands.isEnabled(command, args)) {
-      this.commands.execute(command, args);
+      this.commands.execute(command, args, target);
     } else {
       console.log(`Command '${command}' is disabled.`);
     }
@@ -561,6 +564,11 @@ class Menu extends Widget {
       childMenu.close();
     }
 
+    // Zero out the .target property of every item owned by this menu.
+    for (let item of this._items) {
+      item.clearTarget();
+    }
+
     // Remove this menu from its parent and activate the parent.
     let parentMenu = this._parentMenu;
     if (parentMenu) {
@@ -987,6 +995,13 @@ namespace Menu {
      */
     args?: ReadonlyJSONObject;
 
+    /**
+     * The HTML node associated with this menu item, if any.
+     *
+     * The default value is undefined.
+     */
+    target?: HTMLElement;
+
     /**
      * The submenu for a `'submenu'` type item.
      *
@@ -1018,6 +1033,11 @@ namespace Menu {
      */
     readonly args: ReadonlyJSONObject;
 
+    /**
+     * The HTML node associated with this menu item, if any.
+     */
+    readonly target?: HTMLElement;
+
     /**
      * The submenu for a `'submenu'` type item.
      */
@@ -1082,6 +1102,11 @@ namespace Menu {
      * The key binding for the menu item.
      */
     readonly keyBinding: CommandRegistry.IKeyBinding | null;
+
+    /**
+     * Zeros out the .target property.
+     */
+    clearTarget(): void;
   }
 
   /**
@@ -1677,6 +1702,7 @@ namespace Private {
      */
     constructor(commands: CommandRegistry, options: Menu.IItemOptions) {
       this._commands = commands;
+      this._target = options.target;
       this.type = options.type || 'command';
       this.command = options.command || '';
       this.args = options.args || JSONExt.emptyObject;
@@ -1703,6 +1729,13 @@ namespace Private {
      */
     readonly submenu: Menu | null;
 
+    /**
+     * The HTML node associated with this menu item, if any.
+     */
+    get target(): HTMLElement | undefined {
+      return this._target;
+    }
+
     /**
      * The display label for the menu item.
      */
@@ -1850,6 +1883,14 @@ namespace Private {
       return null;
     }
 
+    /**
+     * Zeros out the ._target property.
+     */
+    clearTarget(): void {
+      this._target = undefined;
+    }
+
     private _commands: CommandRegistry;
+    private _target?: HTMLElement;
   }
 }