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/** |
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* Tracks whether a selection modifier key (Ctrl / Cmd / Shift) is currently |
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* held down. While a modifier is held, cell-selection handlers preserve the |
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* existing selection so a multi-cell selection can be built up for merging. |
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* |
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* State is synced from keydown/keyup as well as mousedown — the mousedown sync |
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* (capture phase) runs before the selection handlers, guaranteeing an accurate |
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* value at the moment those handlers check it, even if a keydown landed |
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* in a document we aren't listening to. |
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* |
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* Listeners are attached per-document so this works in both the iframed and |
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* non-iframed editor. |
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*/ |
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|
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let modifierActive = false; |
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|
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function sync(event: KeyboardEvent | MouseEvent): void { |
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modifierActive = event.ctrlKey || event.metaKey || event.shiftKey; |
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} |
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|
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export function isModifierActive(): boolean { |
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return modifierActive; |
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} |
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|
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export function trackModifierKeys(doc: Document): () => void { |
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doc.addEventListener("keydown", sync, true); |
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doc.addEventListener("keyup", sync, true); |
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doc.addEventListener("mousedown", sync, true); |
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|
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return () => { |
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doc.removeEventListener("keydown", sync, true); |
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doc.removeEventListener("keyup", sync, true); |
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doc.removeEventListener("mousedown", sync, true); |
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}; |
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} |
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