I found if I newed a QwtPlotPicker with the selection type of QwtPicker::PolygonSelection, then I could start a pick with LeftButton, and continue the following several picks with RightButton, and end the selection with another click of LeftButton. But I want my interaction like this: start with LeftButton and continue the other picks also with LeftButton, at last end the selection by double-clicking the Left Button.
How could I do?
Thanks~