Additional parameters

Some input messages from mouse returns extra informations about buttons that are pressed when this message occurred. This value has type [4u] and it is the combination of bits. Here are bit values and their meaning:

• 8 - the CTRL key is down
• 1 - the left mouse button is down
• 16 - the middle mouse button is down
• 2 - the right mouse button is down
• 4 - the SHIFT key is down.