state-manager.js
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export var Html5QrcodeScannerState;
(function (Html5QrcodeScannerState) {
Html5QrcodeScannerState[Html5QrcodeScannerState["UNKNOWN"] = 0] = "UNKNOWN";
Html5QrcodeScannerState[Html5QrcodeScannerState["NOT_STARTED"] = 1] = "NOT_STARTED";
Html5QrcodeScannerState[Html5QrcodeScannerState["SCANNING"] = 2] = "SCANNING";
Html5QrcodeScannerState[Html5QrcodeScannerState["PAUSED"] = 3] = "PAUSED";
})(Html5QrcodeScannerState || (Html5QrcodeScannerState = {}));
var StateManagerImpl = (function () {
function StateManagerImpl() {
this.state = Html5QrcodeScannerState.NOT_STARTED;
this.onGoingTransactionNewState = Html5QrcodeScannerState.UNKNOWN;
}
StateManagerImpl.prototype.directTransition = function (newState) {
this.failIfTransitionOngoing();
this.validateTransition(newState);
this.state = newState;
};
StateManagerImpl.prototype.startTransition = function (newState) {
this.failIfTransitionOngoing();
this.validateTransition(newState);
this.onGoingTransactionNewState = newState;
return this;
};
StateManagerImpl.prototype.execute = function () {
if (this.onGoingTransactionNewState
=== Html5QrcodeScannerState.UNKNOWN) {
throw "Transaction is already cancelled, cannot execute().";
}
var tempNewState = this.onGoingTransactionNewState;
this.onGoingTransactionNewState = Html5QrcodeScannerState.UNKNOWN;
this.directTransition(tempNewState);
};
StateManagerImpl.prototype.cancel = function () {
if (this.onGoingTransactionNewState
=== Html5QrcodeScannerState.UNKNOWN) {
throw "Transaction is already cancelled, cannot cancel().";
}
this.onGoingTransactionNewState = Html5QrcodeScannerState.UNKNOWN;
};
StateManagerImpl.prototype.getState = function () {
return this.state;
};
StateManagerImpl.prototype.failIfTransitionOngoing = function () {
if (this.onGoingTransactionNewState
!== Html5QrcodeScannerState.UNKNOWN) {
throw "Cannot transition to a new state, already under transition";
}
};
StateManagerImpl.prototype.validateTransition = function (newState) {
switch (this.state) {
case Html5QrcodeScannerState.UNKNOWN:
throw "Transition from unknown is not allowed";
case Html5QrcodeScannerState.NOT_STARTED:
this.failIfNewStateIs(newState, [Html5QrcodeScannerState.PAUSED]);
break;
case Html5QrcodeScannerState.SCANNING:
break;
case Html5QrcodeScannerState.PAUSED:
break;
}
};
StateManagerImpl.prototype.failIfNewStateIs = function (newState, disallowedStatesToTransition) {
for (var _i = 0, disallowedStatesToTransition_1 = disallowedStatesToTransition; _i < disallowedStatesToTransition_1.length; _i++) {
var disallowedState = disallowedStatesToTransition_1[_i];
if (newState === disallowedState) {
throw "Cannot transition from ".concat(this.state, " to ").concat(newState);
}
}
};
return StateManagerImpl;
}());
var StateManagerProxy = (function () {
function StateManagerProxy(stateManager) {
this.stateManager = stateManager;
}
StateManagerProxy.prototype.startTransition = function (newState) {
return this.stateManager.startTransition(newState);
};
StateManagerProxy.prototype.directTransition = function (newState) {
this.stateManager.directTransition(newState);
};
StateManagerProxy.prototype.getState = function () {
return this.stateManager.getState();
};
StateManagerProxy.prototype.canScanFile = function () {
return this.stateManager.getState() === Html5QrcodeScannerState.NOT_STARTED;
};
StateManagerProxy.prototype.isScanning = function () {
return this.stateManager.getState() !== Html5QrcodeScannerState.NOT_STARTED;
};
StateManagerProxy.prototype.isStrictlyScanning = function () {
return this.stateManager.getState() === Html5QrcodeScannerState.SCANNING;
};
StateManagerProxy.prototype.isPaused = function () {
return this.stateManager.getState() === Html5QrcodeScannerState.PAUSED;
};
return StateManagerProxy;
}());
export { StateManagerProxy };
var StateManagerFactory = (function () {
function StateManagerFactory() {
}
StateManagerFactory.create = function () {
return new StateManagerProxy(new StateManagerImpl());
};
return StateManagerFactory;
}());
export { StateManagerFactory };
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