@launchmenu/core
Version:
An environment for visual keyboard controlled applets
36 lines • 3.14 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.setupModifierCatcherHandler = void 0;
/**
* A handler that catches keyboard up event for modifiers if any other key was pressed since the modifier was activated.
* Used for making 'shift' toggle selection in menu only if it wasn't used to update the text selection
* @param modifiers The getter for the modifiers to catch
* @param listener The listener object to wrap in order to detect whether the modifier was used
* @returns A new key handler
*/
function setupModifierCatcherHandler(modifiers, listener) {
const listenerObj = listener instanceof Function ? { emit: listener } : listener;
/** Stores whether any keys were caught since reset */
let caughtKey = false;
return {
init: () => { var _a; return (_a = listenerObj.init) === null || _a === void 0 ? void 0 : _a.call(listenerObj); },
emit: e => {
// Handle modifier key catching
const isModifier = modifiers().find(p => p.matches(e, true));
if (isModifier) {
if (e.type == "down")
caughtKey = false;
// If we release the selection key, and we actually used as a modifier for something, prevent the event sinking down
if (e.type == "up" && caughtKey)
return true;
}
if (listenerObj.emit(e)) {
caughtKey = true;
return true;
}
},
destroy: () => { var _a; return (_a = listenerObj.destroy) === null || _a === void 0 ? void 0 : _a.call(listenerObj); },
};
}
exports.setupModifierCatcherHandler = setupModifierCatcherHandler;
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