if the value of scrollbar is changed(signal is emited), then show the image, which its number in image set is the value of scrollbar.
for example, there are 40 images I want to show on the label. then the range of scrollbar is 1-40(actually 0-39).
I am not sure how to fresh the label. certainly it is the first time I am trying to design a GUI. so if you have suggestion, please tell me. thanks a lot.
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