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Function 40 - set a mask for the expected events.

The mask for the expected events affects the functions of working with events 10,

11, 23 - they only report on events resolved by this mask.

Options:

  * eax = 40 - function number

  * ebx = mask: bit i corresponds to event i + 1 (see list of events)

    (the set bit enables event notification)

bit 31: mouse event activity filter

bit 31 = 0 - inactive window always receives mouse events

bit 31 = 1 - inactive window does not receive mouse events

bit 30: cursor position filter

bit 30 = 0 - the window accepts mouse events if the cursor is outside the window

bit 30 = 1 - the window does not accept mouse events if the cursor is outside the window

Return value:

  * eax = previous mask value

Remarks:

  The default mask (7 = 111b) allows redrawing notifications and keystrokes and buttons. This is sufficient for most applications.

  Events prohibited in the mask are still saved if they come; they are simply not notified of the event functions.

  Event functions take into account the mask at the time the function is called, and not at the time the message arrives.

Constants for registers:

eax - SF_SET_EVENTS_MASK (40)

DO NOT MAKE LEMONADE