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