Qt selection of ROI by mouse

  • Hello my friends
    I an new comer in Qt programming + opencv
    I had a question: I am doing a project and implementing one Guiapplication in Qt... On my form I have a Qgraphics view component and one photo is loaded inside it...in this photo I am going to select ROI (Region Of Interest) by mouse manually and then on that ROI I do others...I have the samle code of mouseHandler but I do not know how can I use it in Qt.
    My problem: how is it possible to select ROI on one photo which has been loaded in Qgraphics view(of cousre with mouse handler)
    is it possible? if so, plz help me...
    and any sample code appreciated...

    thanks in advance...

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