ColorDialog.chooseRgba

void chooseRgba(gtk.window.Window parent,  gdk.rgba.RGBA initialColor,  gio.cancellable.Cancellable cancellable =  null,  gio.types.AsyncReadyCallback callback =  null)

This function initiates a color choice operation by presenting a color chooser dialog to the user.

The callback will be called when the dialog is dismissed. It should call [gtk.color_dialog.ColorDialog.chooseRgbaFinish] to obtain the result.

Parameters

`parent`	the parent [gtk.window.Window]
`initialColor`	the color to select initially
`cancellable`	a [gio.cancellable.Cancellable] to cancel the operation
`callback`	a callback to call when the operation is complete