How to capture an item (node) in Scrollview when it out of the screen?

How to capture an item (node) in Scrollview when it out of the screen?
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#1

I make an app like the image below:


this app include:

  1. a scrollview with some items (colored each one) init.
  2. A button (Capture). when user click it, app will capture the red item in scrollview.
    For now, I followed the example-cases-master: download here: https://github.com/cocos-creator/example-cases/blob/master/assets/cases/07_capture_texture/capture_to_native.js
    I can capture the red item in scrollview when it on the screen. But when user move it out of screen, I can capture this. How can I do this?
    Please help me?
    Thank you very much!