Here's the logic but I'm facing problems to continue.
mouseenter/mouseleave to show/hide checkbox, if checkbox checked deactive the mouse and leave function to make the checkbox stay visible.
my code and demo http://plnkr.co/edit/LdBbWzbpKC1TSR7faslf?p=preview
Here's one possibility:
http://plnkr.co/edit/Sx19bbWGmuovMhVW62PC?p=preview
<input ng-show="showC || checked" type="checkbox"
id="{{$index}}" ng-model="checked">
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