Add `activated` signal to console panel.

src/console/panel.ts

@@ -9,6 +9,10 @@ import {
   Message
 } from 'phosphor/lib/core/messaging';
 
+import {
+  defineSignal, ISignal
+} from 'phosphor/lib/core/signaling';
+
 import {
   Panel
 } from 'phosphor/lib/ui/panel';
@@ -53,6 +57,11 @@ class ConsolePanel extends Panel {
     this.addWidget(this._console);
   }
 
+  /**
+   * A signal emitted when the console panel has been activated.
+   */
+  activated: ISignal<ConsolePanel, void>;
+
   /**
    * The console widget used by the panel.
    *
@@ -83,6 +92,7 @@ class ConsolePanel extends Panel {
    */
   protected onActivateRequest(msg: Message): void {
     this.content.activate();
+    this.activated.emit(void 0);
   }
 
   /**
@@ -113,6 +123,10 @@ class ConsolePanel extends Panel {
 }
 
 
+// Define the signals for the `ConsolePanel` class.
+defineSignal(ConsolePanel.prototype, 'activated');
+
+
 /**
  * A namespace for ConsolePanel statics.
  */