- Finally, the event's modifier field is used to
tell what the state of the keyboard modifiers are when a mouse or key
event occurs. The modifier's field may include any of the masks shown
in the following table.
Event Mask |
Description |
SHIFT_MASK |
the shift key is held down. |
CTRL_MASK |
the control key is held down. |
META_MASK |
the meta key is held down or
the third mouse button is pressed. |
ALT_MASK |
the alt key is held down. |
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