Opencv 2.4.9 highgui +qt: howto disable menu (right click context)

asked 2014-04-30 16:09:09 -0600

76 ●3 ●9

Hello all,

I'm looking for a way to disable the context menu when right clicking on namedWindow (see http://docs.opencv.org/modules/highgui/doc/qt_new_functions.html for clarification)

The reason is, I want to use the right mouse button for some user interaction but the menu keeps popping up and is therefore disturbing havily.

I also tried to identifiy the part of opencv source code (QT_window.cpp) where the callback function with rightbuttonup is set - as you might guess, unsuccessfully.

Thank you for any help.

Kind regards AR

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Just dont build with Qt support or isn't that an option? You can still use the windows but the other functions get isolated, like the right mouse click.

StevenPuttemans ( 2014-05-01 02:34:07 -0600 )edit

Hi StevenPuttermans and thanks for your reply, unfortunately I'm in need of the Qt enhanced GUI functionalities (like resize window, zoom in/out, take picture). Therefore, building opencv with qt is a must.

AR0x7E7 ( 2014-05-01 02:49:07 -0600 )edit

Then I am afraid you will need another hotkey than the mouse button :P

StevenPuttemans ( 2014-05-01 02:49:53 -0600 )edit

Yes, this might be plan B - however, I'm a programmer, this whole software is open source, so In my opinion it has to be possible and it might just be a few loc in need to be commented (i.e. the switch statement which handles the mousrightbuttonclick event triggering the context menu to appear) and my mission will be accomplished :P

AR0x7E7 ( 2014-05-01 02:53:32 -0600 )edit

That is true :) it is probably possible to find the correct file in the source code.

StevenPuttemans ( 2014-05-01 02:56:39 -0600 )edit

so I found the appropriate part of code to comment =) Unfortunately, I have to wait until tomorrow until I can answer my own question :D

AR0x7E7 ( 2014-05-01 08:12:54 -0600 )edit

Ok, do post your solution, since it will help others tackling the same problem.

StevenPuttemans ( 2014-05-02 02:14:05 -0600 )edit

StevenPuttemans, can you please accept the answer below and close the question? I lack sufficient reputation ;D Of course you can check my solution first.

AR0x7E7 ( 2014-05-03 02:15:10 -0600 )edit

@AR0x7E7, only you can accept it as solved, but we can upvote it, until you get enough rep. ;)

berak ( 2014-05-03 02:38:38 -0600 )edit

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answered 2014-05-03 02:13:07 -0600

AR0x7E7

76 ●3 ●9

In order to deactivate the right click context menu using opencv 2.4.9 namedWindow with Qt 5.2.1 search for file:

opencv\sources\modules\highgui\src\window_QT.cpp

find the following function (usually line 2514):

void DefaultViewPort::contextMenuEvent(QContextMenuEvent* evnt)
{
    if (centralWidget->vect_QActions.size() > 0)
    {
        QMenu menu(this);

        foreach (QAction *a, centralWidget->vect_QActions)
            menu.addAction(a);

        menu.exec(evnt->globalPos());
    }
}

set it to (alternatively just comment the inside of function):

void DefaultViewPort::contextMenuEvent(QContextMenuEvent* evnt)
{
    return;
}

recompile opencv, done.

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hi, how can I recompile opencv on a mac / Xcode? Thx

scharti ( 2014-09-08 13:35:43 -0600 )edit

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answered 2015-01-03 03:10:27 -0600

fupolarbear
31 ●1 ●3

updated 2015-01-03 03:13:26 -0600

According to < http://docs.opencv.org/modules/highgu... >

use para 'CV_GUI_NORMAL' can solve your problem, following is the code from the official guide (url above):

cvNamedWindow("main2",CV_WINDOW_AUTOSIZE | CV_GUI_NORMAL);

the CV_GUI_NORMAL can disable the useless and annoying toolbox.

and I don't think recompiling OpenCV is a good idea.

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This should be the best answer. It is more practical and easier to porting to different environment than recompiling OpenCV.

ZheH ( 2020-02-21 16:07:01 -0600 )edit

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answered 2014-06-10 12:43:16 -0600

alrojas
11 ●1

Hi, think the "right way" is set namedWindow flag with << CV_WINDOW_OPENGL + CV_WINDOW_AUTOSIZE >> :P

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Opencv 2.4.9 highgui +qt: howto disable menu (right click context)

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