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Editorial Team
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Asked: 2026-06-11T23:37:23+00:00

I am trying to program specific behaviour when the user (clicks and) releases the

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I am trying to program specific behaviour when the user (clicks and) releases the left and right mouse at the same time. Is there a known way to trap such an event / gesture. I am aware of how to trap leftButtonUp and rightButtonUp but not sure how I can trap this event.

If the left button is pressed and then the right button is pressed with a delta delay, that is OK. When the user releases the right button / left button and if this is followed up by release of other button within a defined epsilon time then such an event should be raised.

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  1. Editorial Team

    There is no such event in WinAPI, but you may track it yourself. wParam of all button down/up messages contains information of the state of all buttons at the time of event:

    MK_LBUTTON 0x0001 The left mouse button is down.
MK_MBUTTON 0x0010 The middle mouse button is down.
MK_RBUTTON 0x0002 The right mouse button is down.

    Thus, you need to keep the track of changes and define a threshold that will filter out all events that you like to consider as a “simultaneous click/release”

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