GdkWindowClass
Gdk::INPUT_OUTPUT windows are the standard kind of window you might expect. Gdk::INPUT_ONLY windows are invisible; they are used to trap events, but you can't draw on them.
Value | Symbolic name | Description |
| 0 | Gdk::INPUT_OUTPUT | Window for graphics and events. |
| 1 | Gdk::INPUT_ONLY | Window for events only. |