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| module.exports = function createQRScanner(cordova){
// The native implementations should return their status as ['string':'string']
// dictionaries. Boolean values are encoded to '0' and '1', respectively.
function stringToBool(string) {
switch (string) {
case '1':
return true;
case '0':
return false;
default:
throw new Error('QRScanner plugin returned an invalid boolean number-string: ' + string);
}
}
// Converts the returned ['string':'string'] dictionary to a status object.
function convertStatus(statusDictionary) {
return {
authorized: stringToBool(statusDictionary.authorized),
denied: stringToBool(statusDictionary.denied),
restricted: stringToBool(statusDictionary.restricted),
prepared: stringToBool(statusDictionary.prepared),
scanning: stringToBool(statusDictionary.scanning),
previewing: stringToBool(statusDictionary.previewing),
showing: stringToBool(statusDictionary.showing),
lightEnabled: stringToBool(statusDictionary.lightEnabled),
canOpenSettings: stringToBool(statusDictionary.canOpenSettings),
canEnableLight: stringToBool(statusDictionary.canEnableLight),
canChangeCamera: stringToBool(statusDictionary.canChangeCamera),
currentCamera: parseInt(statusDictionary.currentCamera)
};
}
// Simple utility method to ensure the background is transparent. Used by the
// plugin to force re-rendering immediately after the native webview background
// is made transparent.
function clearBackground() {
var body = document.body;
if (body.style) {
body.style.backgroundColor = 'rgba(0,0,0,0.01)';
body.style.backgroundImage = '';
setTimeout(function() {
body.style.backgroundColor = 'transparent';
}, 1);
if (body.parentNode && body.parentNode.style) {
body.parentNode.style.backgroundColor = 'transparent';
body.parentNode.style.backgroundImage = '';
}
}
}
function errorCallback(callback) {
if (!callback) {
return null;
}
return function(error) {
var errorCode = parseInt(error);
var QRScannerError = {};
switch (errorCode) {
case 0:
QRScannerError = {
name: 'UNEXPECTED_ERROR',
code: 0,
_message: 'QRScanner experienced an unexpected error.'
};
break;
case 1:
QRScannerError = {
name: 'CAMERA_ACCESS_DENIED',
code: 1,
_message: 'The user denied camera access.'
};
break;
case 2:
QRScannerError = {
name: 'CAMERA_ACCESS_RESTRICTED',
code: 2,
_message: 'Camera access is restricted.'
};
break;
case 3:
QRScannerError = {
name: 'BACK_CAMERA_UNAVAILABLE',
code: 3,
_message: 'The back camera is unavailable.'
};
break;
case 4:
QRScannerError = {
name: 'FRONT_CAMERA_UNAVAILABLE',
code: 4,
_message: 'The front camera is unavailable.'
};
break;
case 5:
QRScannerError = {
name: 'CAMERA_UNAVAILABLE',
code: 5,
_message: 'The camera is unavailable.'
};
break;
case 6:
QRScannerError = {
name: 'SCAN_CANCELED',
code: 6,
_message: 'Scan was canceled.'
};
break;
case 7:
QRScannerError = {
name: 'LIGHT_UNAVAILABLE',
code: 7,
_message: 'The device light is unavailable.'
};
break;
case 8:
// Open settings is only available on iOS 8.0+.
QRScannerError = {
name: 'OPEN_SETTINGS_UNAVAILABLE',
code: 8,
_message: 'The device is unable to open settings.'
};
break;
default:
QRScannerError = {
name: 'UNEXPECTED_ERROR',
code: 0,
_message: 'QRScanner returned an invalid error code.'
};
break;
}
callback(QRScannerError);
};
}
function successCallback(callback) {
if (!callback) {
return null;
}
return function(statusDict) {
callback(null, convertStatus(statusDict));
};
}
function doneCallback(callback, clear) {
if (!callback) {
return null;
}
return function(statusDict) {
if (clear) {
clearBackground();
}
callback(convertStatus(statusDict));
};
}
return {
prepare: function(callback) {
cordova.exec(successCallback(callback), errorCallback(callback), 'QRScanner', 'prepare', []);
},
destroy: function(callback) {
cordova.exec(doneCallback(callback, true), null, 'QRScanner', 'destroy', []);
},
scan: function(callback) {
if (!callback) {
throw new Error('No callback provided to scan method.');
}
var success = function(result) {
callback(null, result);
};
cordova.exec(success, errorCallback(callback), 'QRScanner', 'scan', []);
},
cancelScan: function(callback) {
cordova.exec(doneCallback(callback), null, 'QRScanner', 'cancelScan', []);
},
show: function(callback) {
cordova.exec(doneCallback(callback, true), null, 'QRScanner', 'show', []);
},
hide: function(callback) {
cordova.exec(doneCallback(callback, true), null, 'QRScanner', 'hide', []);
},
pausePreview: function(callback) {
cordova.exec(doneCallback(callback), null, 'QRScanner', 'pausePreview', []);
},
resumePreview: function(callback) {
cordova.exec(doneCallback(callback), null, 'QRScanner', 'resumePreview', []);
},
enableLight: function(callback) {
cordova.exec(successCallback(callback), errorCallback(callback), 'QRScanner', 'enableLight', []);
},
disableLight: function(callback) {
cordova.exec(successCallback(callback), errorCallback(callback), 'QRScanner', 'disableLight', []);
},
useCamera: function(index, callback) {
cordova.exec(successCallback(callback), errorCallback(callback), 'QRScanner', 'useCamera', [index]);
},
useFrontCamera: function(callback) {
var frontCamera = 1;
if (callback) {
this.useCamera(frontCamera, callback);
} else {
cordova.exec(null, null, 'QRScanner', 'useCamera', [frontCamera]);
}
},
useBackCamera: function(callback) {
var backCamera = 0;
if (callback) {
this.useCamera(backCamera, callback);
} else {
cordova.exec(null, null, 'QRScanner', 'useCamera', [backCamera]);
}
},
openSettings: function(callback) {
if (callback) {
cordova.exec(successCallback(callback), errorCallback(callback), 'QRScanner', 'openSettings', []);
} else {
cordova.exec(null, null, 'QRScanner', 'openSettings', []);
}
},
getStatus: function(callback) {
if (!callback) {
throw new Error('No callback provided to getStatus method.');
}
cordova.exec(doneCallback(callback), null, 'QRScanner', 'getStatus', []);
}
};
};
|