onPopupEvents([callback], [remove])

Class: Menu.

Description:

Registers, unregisters and gets a list of handler functions for the menu popup events (when the menu becomes expended and collapsed).

Parameters:

Name	Type	Description
`[callback]`	function	Event handler function that receives a PopupEvent as an argument. Pass `null` to unregister all registered callbacks.
`[remove]`	boolean	Set to `true` to unregister the handler function.

Returns:

Returns an array of registered handler functions if arguments are omitted, otherwise returns this component instance.

Type: Array.<function()> | ComboBox

Examples:

mainForm.mainMenuBar = new MenuBar();
let handler = function(e){console.log(e);}
mainForm.fileMenu = new Menu("File").addTo(mainForm.mainMenuBar).onPopupEvents(handler);

// event Object format:
const e = {
  target: object,        // The component that triggered the event.
  type: string,          // `show`, `hide`, `cancel`.
  invoker: Object        // UI Component that invoked the popup, or `null` if it was invoked programmatically.
  x: number,             // X position relative to invoker. Only present when invoker is not `null`.
  y: number,             // Y position relative to invoker. Only present when invoker is not `null`.
  screenX: number,       // X position relative to default screen.
  screenY: number,       // Y position relative to default screen.
  interactive: boolean,  // Indicates if the popup was triggered by user's interaction (not programmatically).
};

Also See:

PopupEvent