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