... ばかり => About … N2
More or less in quantity
ばかりだ => Just N3
Result status
... ばかり => only; just ~ N2
For example, simile
~とばかり(に)      => as if to say; as though~ N1
~といわんばかり => as if to say N1
Similarity
ばかり => only; nothing but ~ N3
... ばかりで => only, just ~ N3
Criticize
…とばかりおもっていた => Thought that ... N3
Speculation
ばかり => only; just ~ (negative description) N3
Continuous
ばかりだ => just done, just N4
...ばかりだ => (Only) continue to N2
Completed
かりに…たら/…ば => If..., suppose... N3
Condition (hypothetical condition)