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LibWeb: Implement "traverse the history by delta" for traversables

This commit is contained in:
Aliaksandr Kalenik 2023-04-07 00:03:15 +03:00 committed by Andreas Kling
parent 0e2684b10f
commit aafa09e7a5
2 changed files with 29 additions and 0 deletions

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@ -470,4 +470,32 @@ void TraversableNavigable::clear_the_forward_session_history()
}
}
// https://html.spec.whatwg.org/multipage/browsing-the-web.html#traverse-the-history-by-a-delta
void TraversableNavigable::traverse_the_history_by_delta(int delta)
{
// FIXME: 1. Let sourceSnapshotParams and initiatorToCheck be null.
// FIXME: 2. If sourceDocument is given, then:
// 3. Append the following session history traversal steps to traversable:
// 1. Let allSteps be the result of getting all used history steps for traversable.
auto all_steps = get_all_used_history_steps();
// 2. Let currentStepIndex be the index of traversable's current session history step within allSteps.
auto current_step_index = *all_steps.find_first_index(current_session_history_step());
// 3. Let targetStepIndex be currentStepIndex plus delta
auto target_step_index = current_step_index + delta;
// 4. If allSteps[targetStepIndex] does not exist, then abort these steps.
if (target_step_index >= all_steps.size()) {
return;
}
// 5. Apply the history step allSteps[targetStepIndex] to traversable, with checkForUserCancelation set to true,
// sourceSnapshotParams set to sourceSnapshotParams, and initiatorToCheck set to initiatorToCheck.
apply_the_history_step(all_steps[target_step_index]);
}
}