CODEWITHSUNDEEP
macosqtwinapi
Mr. Boy
Mr. Boy

Reputation: 63816

Is it possible to suppress single-click events during a double-click?

Our application supports single click and double-click events on a window which do different things. However we always get a single-click event during the double-click which causes undesired effects.

Our application is in Qt but really this is a question about underlying Windows/Mac APIs - is this a fundamental detail that the OS detects a single click as soon as you lift your finger since it can't possibly know you are going to click a second time, or can it be prevented?

If it can't be prevented, is their an accepted best practice how to handle it?

Upvotes: 0

Views: 284

Answers (1)

catnip
catnip

Reputation: 25388

Start a timer when you get WM_LBUTTONDOWN (or Qt equivalent). If you get WM_LBUTTONDBLCLK (or Qt equivalent) before the timer expires, cancel the timer and execute your double-click action. Otherwise, when the timer expires, execute your single-click event.

On Windows, you can get the double-click time using GetDoubleClickTime().

That's about the best you can do - you can't prevent the single click message being generated in the first place on either platform.

Upvotes: 4

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