Determines a pressed mouse button. It contains the following values:
| Member | Description |
|---|---|
| None | No mouse button was pressed. |
| Left | The left mouse button was pressed. |
| Right | The right mouse button was pressed. |
| Middle | The middle mouse button was pressed. |
| XButton1 | The first XButton button was pressed. |
| XButton2 | The second XButton button was pressed. |