SM_CYDOUBLECLK top-level constant Null safety
The height of the rectangle around the location of a first click in a double-click sequence, in pixels. The second click must occur within the rectangle defined by SM_CXDOUBLECLK and SM_CYDOUBLECLK for the system to consider the two clicks a double-click. The two clicks must also occur within a specified time.
const SM_CYDOUBLECLK = 37;