PyGUI - ModalDialog class

# class `ModalDialog(Dialog)`

The ModalDialog class is a subclass of Dialog designed for modal dialogs. It has a default style of `'modal_dialog'` and provides facilities for presenting the dialog modally.
While a ModalDialog is active, interaction with other parts of the application is prevented. Other windows cannot be activated, application-wide menu commands other than those used by the dialog itself are not enabled, and unhandled events and messages are not forwarded to the application.

## Constructor

> `ModalDialog(style` `=` `'modal_dialog',`
> `` `closable` `=` `False,` `resizable` `=` `False,` `zoomable` = `False``,`
> `movable` `=` default`,` `hidable` = default`)`
>   Constructs a ModalDialog with the specified options. The default values for the `movable` and `hidable` options are platform-dependent.

## Methods

> `present()`
>   Present the dialog modally. The dialog is shown and a nested event loop is entered which prevents interaction with any other part of the application. This method retains control until the dialog's `dismiss()` method is called, at which time it returns with the value passed to `dismiss()`.
>   Note: The dialog is not automatically hidden when the present() method returns.

> `dismiss(result` `=` `0)`
>   Hides the dialog and, if the dialog is being presented modally, causes the `present()` method to return with the given result as its return value.

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