getOpenTarget method
calculate the target ratio when we want to open the panel at position
if there is no SlideActionPanel at position
, return null
Implementation
double? getOpenTarget(ActionPosition position) {
if (position == ActionPosition.pre && !hasPreAction) {
return null;
} else if (position == ActionPosition.post && !hasPostAction) {
return null;
}
return switch (position) {
ActionPosition.pre => 1,
ActionPosition.post => -1,
};
}