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Try to solve I21853 mouse wheel problem with GTK3#21856

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LaurentBerger:I21853
Apr 29, 2022
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Try to solve I21853 mouse wheel problem with GTK3#21856
opencv-pushbot merged 1 commit intoopencv:3.4from
LaurentBerger:I21853

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@LaurentBerger LaurentBerger commented Apr 12, 2022

Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

  • I agree to contribute to the project under Apache 2 License.
  • To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
  • The PR is proposed to the proper branch
  • There is a reference to the original bug report and related work
  • There is accuracy test, performance test and test data in opencv_extra repository, if applicable
    Patch to opencv_extra has the same branch name.
  • The feature is well documented and sample code can be built with the project CMake

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asmorkalov commented Apr 21, 2022

#21853

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asmorkalov commented Apr 21, 2022

@LaurentBerger Thanks for the patch. Unfortunately it's not complete. I do not have mouse with horizontal scroll, but with regular mouse I see this in logs:


  GUI:                           GTK3
    GTK+:                        YES (ver 3.22.30)
      GThread :                  YES (ver 2.56.4)
      GtkGlExt:                  NO
    VTK support:                 NO

....

  Install to:                    /usr/local
-----------------------------------------------------------------


EVENT_LBUTTONDOWN
EVENT_LBUTTONDOWN
EVENT_MOUSEHWHEEL
EVENT_MOUSEWHEEL
EVENT_MOUSEWHEEL
EVENT_MOUSEWHEEL
EVENT_MOUSEWHEEL
EVENT_MOUSEWHEEL
EVENT_MOUSEWHEEL

My code to reproduce the issue:

void onMouse(int event, int x, int y, int flags, void *userdata)
{
    if (event == cv::EVENT_MOUSEWHEEL)
        std::cout << "EVENT_MOUSEWHEEL" << std::endl;
    if (event == cv::EVENT_MOUSEHWHEEL)
        std::cout << "EVENT_MOUSEHWHEEL" << std::endl;
    if (event == cv::EVENT_LBUTTONDOWN)
        std::cout << "EVENT_LBUTTONDOWN" << std::endl;
    if (event == cv::EVENT_RBUTTONDOWN)
        std::cout << "EVENT_MOUSEHWHEEL" << std::endl;

}

int main(int argc, char**argv)
{
    std::cout<< cv::getBuildInformation();
    cv::Mat img = cv::imread("/mnt/projects/Projects/OpenCV/opencv-master/samples/data/lena.jpg", cv::IMREAD_COLOR);
    char key = 0;
    cv::namedWindow("Test Event");
    cv::setMouseCallback("Test Event", onMouse);
    while (key != 27)
    {
       if (img.empty())
            return 0;
       cv::imshow("Test Event", img);
       key = cv::pollKey();
    }

    return 0;
}

BTW, if (flags & cv::EVENT_MOUSEWHEEL) is incorrect check in your repro.

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asmorkalov commented Apr 21, 2022

Platform: ubuntu 18.04 amd64 with KDE, if it's important.

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LaurentBerger commented Apr 22, 2022 •
edited
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My version is

  GUI:                           GTK3
    GTK+:                        YES (ver 3.24.24)
      GThread :                  YES (ver 2.66.8)
      GtkGlExt:                  NO
    VTK support:                 NO


lsb_release -a
No LSB modules are available.
Distributor ID: Raspbian
Description:    Raspbian GNU/Linux 11 (bullseye)
Release:        11
Codename:       bullseye


uname -srm
Linux 5.10.103-v7+ armv7l

@asmorkalov asmorkalov self-requested a review April 27, 2022 14:34
asmorkalov
asmorkalov approved these changes Apr 27, 2022
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Thanks a lot!

@asmorkalov asmorkalov changed the base branch from 4.x to 3.4 April 29, 2022 06:00
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asmorkalov commented Apr 29, 2022

@LaurentBerger Thanks a lot for the patch! The same issue is present in 3.4 too. I re-based and re-targeted the PR to 3.4. The fix will appear in 4.x after regular 3.4->4.x merge.

@opencv-pushbot opencv-pushbot added this to the 3.4.18 milestone Apr 29, 2022
@opencv-pushbot opencv-pushbot merged commit 039f3d0 into opencv:3.4 Apr 29, 2022
@opencv-pushbot opencv-pushbot mentioned this pull request Apr 30, 2022
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@opencv-pushbot opencv-pushbot linked an issue Apr 30, 2022 that may be closed by this pull request
EVENT_MOUSEWHEEL with gtk3 #21853
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@alalek alalek mentioned this pull request Aug 21, 2022
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@LaurentBerger LaurentBerger deleted the I21853 branch March 31, 2023 18:55
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EVENT_MOUSEWHEEL with gtk3

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