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Cancel scanning; improving start/stop behavior

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feature/image-source
Christoph Oberhofer 8 years ago
parent 255e5a6937
commit efb3b6c5bc
7 changed files with 116 additions and 121 deletions
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3
example/css/styles.css
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@ -48,6 +48,7 @@
}
.overlay {
display: none;
overflow: hidden;
position: fixed;
top: 0;
@ -58,7 +59,7 @@
background-color: rgba(0, 0, 0, 0.3);
}
.overlay__content {
.overlay__container {
top: 50%;
position: absolute;
left: 50%;

95
example/scan-to-input/index.html
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@ -52,22 +52,24 @@ var App = {
_scanner: null,
init: function() {
this.attachListeners();
this._overlay = document.querySelector('.overlay');
},
activateScanner: function() {
var scanner = this.configureScanner('.overlay__content'),
onDetected = function (result) {
document.querySelector('input.isbn').value = result.codeResult.code;
stop();
}.bind(this),
stop = function() {
scanner.stop(); // should also clear all event-listeners?
scanner.removeEventListener('detected', onDetected);
this.hideOverlay();
this.attachListeners();
}.bind(this);
this.showOverlay(stop);
scanner.addEventListener('detected', onDetected).start();
this.configureScanner('.overlay__content')
.then(function(scanner) {
this.showOverlay(scanner.stop.bind(scanner));
return scanner.detect();
}.bind(this))
.then(function(result) {
document.querySelector('input.isbn').value = result.codeResult.code;
})
.catch((e) => {
console.log(e);
})
.then(function() {
this.hideOverlay();
this.attachListeners();
}.bind(this));
},
attachListeners: function() {
var self = this,
@ -80,29 +82,11 @@ var App = {
});
},
showOverlay: function(cancelCb) {
if (!this._overlay) {
var content = document.createElement('div'),
closeButton = document.createElement('div');
closeButton.appendChild(document.createTextNode('X'));
content.className = 'overlay__content';
closeButton.className = 'overlay__close';
this._overlay = document.createElement('div');
this._overlay.className = 'overlay';
this._overlay.appendChild(content);
content.appendChild(closeButton);
closeButton.addEventListener('click', function closeClick() {
closeButton.removeEventListener('click', closeClick);
cancelCb();
});
document.body.appendChild(this._overlay);
} else {
var closeButton = document.querySelector('.overlay__close');
closeButton.addEventListener('click', function closeClick() {
closeButton.removeEventListener('click', closeClick);
cancelCb();
});
}
var closeButton = document.querySelector('.overlay__close');
closeButton.addEventListener('click', function closeClick() {
closeButton.removeEventListener('click', closeClick);
cancelCb();
});
this._overlay.style.display = "block";
},
hideOverlay: function() {
@ -111,20 +95,18 @@ var App = {
}
},
configureScanner: function(selector) {
if (!this._scanner) {
this._scanner = Quagga
.decoder({readers: ['ean_reader']})
.locator({patchSize: 'medium'})
.fromVideo({
target: selector,
constraints: {
width: 800,
height: 600,
facingMode: "environment"
}
});
if (this._scanner) {
return Promise.resolve(this._scanner);
}
return this._scanner;
return Quagga.fromCamera({
decoder: {readers: ['ean_reader']},
target: selector,
})
.then((scanner) => {
this._scanner = scanner;
return scanner;
});
}
};
App.init();
@ -141,6 +123,12 @@ App.init();
<button type="button" class="icon-barcode button scan"> </button>
</div>
</form>
<div class="overlay">
<div class="overlay__container">
<div class="overlay__close">X</div>
<div class="overlay__content" />
</div>
</div>
</code>
</pre>
</div>
@ -151,7 +139,12 @@ App.init();
&copy; Copyright by Christoph Oberhofer
</p>
</footer>
<div class="overlay">
<div class="overlay__container">
<div class="overlay__close">X</div>
<div class="overlay__content" />
</div>
</div>
<script src="//webrtc.github.io/adapter/adapter-latest.js" type="text/javascript"></script>
<script src="../../dist/quagga.js" type="text/javascript"></script>
<script src="index.js" type="text/javascript"></script>

82
example/scan-to-input/index.js
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@ -3,22 +3,24 @@ var App = {
_scanner: null,
init: function() {
this.attachListeners();
this._overlay = document.querySelector('.overlay');
},
activateScanner: function() {
var scanner = this.configureScanner('.overlay__content'),
onDetected = function (result) {
document.querySelector('input.isbn').value = result.codeResult.code;
stop();
}.bind(this),
stop = function() {
scanner.stop(); // should also clear all event-listeners?
scanner.removeEventListener('detected', onDetected);
this.hideOverlay();
this.attachListeners();
}.bind(this);
this.showOverlay(stop);
scanner.addEventListener('detected', onDetected).start();
this.configureScanner('.overlay__content')
.then(function(scanner) {
this.showOverlay(scanner.stop.bind(scanner));
return scanner.detect();
}.bind(this))
.then(function(result) {
document.querySelector('input.isbn').value = result.codeResult.code;
})
.catch((e) => {
console.log(e);
})
.then(function() {
this.hideOverlay();
this.attachListeners();
}.bind(this));
},
attachListeners: function() {
var self = this,
@ -31,29 +33,11 @@ var App = {
});
},
showOverlay: function(cancelCb) {
if (!this._overlay) {
var content = document.createElement('div'),
closeButton = document.createElement('div');
closeButton.appendChild(document.createTextNode('X'));
content.className = 'overlay__content';
closeButton.className = 'overlay__close';
this._overlay = document.createElement('div');
this._overlay.className = 'overlay';
this._overlay.appendChild(content);
content.appendChild(closeButton);
closeButton.addEventListener('click', function closeClick() {
closeButton.removeEventListener('click', closeClick);
cancelCb();
});
document.body.appendChild(this._overlay);
} else {
var closeButton = document.querySelector('.overlay__close');
closeButton.addEventListener('click', function closeClick() {
closeButton.removeEventListener('click', closeClick);
cancelCb();
});
}
var closeButton = document.querySelector('.overlay__close');
closeButton.addEventListener('click', function closeClick() {
closeButton.removeEventListener('click', closeClick);
cancelCb();
});
this._overlay.style.display = "block";
},
hideOverlay: function() {
@ -62,20 +46,18 @@ var App = {
}
},
configureScanner: function(selector) {
if (!this._scanner) {
this._scanner = Quagga
.decoder({readers: ['ean_reader']})
.locator({patchSize: 'medium'})
.fromSource({
target: selector,
constraints: {
width: 800,
height: 600,
facingMode: "environment"
}
});
if (this._scanner) {
return Promise.resolve(this._scanner);
}
return this._scanner;
return Quagga.fromCamera({
decoder: {readers: ['ean_reader']},
target: selector,
})
.then((scanner) => {
this._scanner = scanner;
return scanner;
});
}
};
App.init();

6
src/input/CameraSource.js
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@ -208,6 +208,12 @@ export function fromCamera(constraints, {target, scope = Scope.EXTERNAL} = {}) {
stop() {
track.stop();
},
waitUntilReady() {
if (track.readyState === "live") {
return Promise.resolve();
}
return this.applyConstraints(constraints);
},
getScope() {
return scope;
}

6
src/input/SourceInterface.js
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@ -9,6 +9,9 @@ class Source {
getLabel() {}
stop() {}
getScope() {}
waitUntilReady() {
return Promise.resolve();
}
}
export {Source};
@ -23,5 +26,8 @@ export function generateSourceInterface() {
getLabel() {},
stop() {},
getScope() {},
waitUntilReady() {
return Promise.resolve();
},
};
};

21
src/quagga.js
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@ -23,6 +23,7 @@ function fromConfig(pixelCapturer, config) {
let currentConfig = config;
let pendingStart = null;
let initialized = false;
let cancelRequested = false;
return {
addEventListener(eventType, cb) {
scanner.subscribe(eventType, cb);
@ -52,6 +53,7 @@ function fromConfig(pixelCapturer, config) {
return pendingStart;
},
stop() {
cancelRequested = true;
scanner.stop();
initialized = false;
return this;
@ -59,28 +61,27 @@ function fromConfig(pixelCapturer, config) {
detect() {
if (source.type === 'CAMERA'
|| source.type === 'VIDEO') {
let cancelRequested = false;
return {
cancel() {
cancelRequested = true;
},
promise: new Promise((resolve, reject) => {
cancelRequested = false;
return this.start()
.then(() => {
return new Promise((resolve, reject) => {
function onProcessed(result) {
if (result && result.codeResult && result.codeResult.code) {
scanner.stop();
scanner.unsubscribe("processed", onProcessed);
scanner.unsubscribe("stopped", onProcessed);
resolve(result);
}
if (cancelRequested) {
scanner.stop();
scanner.unsubscribe("processed", onProcessed);
scanner.unsubscribe("stopped", onProcessed);
reject("cancelled!");
}
}
scanner.subscribe("processed", onProcessed);
this.start();
})
};
scanner.subscribe("stopped", onProcessed, true);
});
});
} else {
let pendingDecodeSingle = Promise.resolve();
if (!initialized) {

24
src/scanner.js
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@ -61,6 +61,7 @@ function createScanner(pixelCapturer) {
$drawable.style.width = `${zoom * 100}%`;
$drawable.style.transform = `translate(${translate}%, ${translate}%)`;
$drawable.style.position = 'absolute';
$viewport.style.paddingBottom = `${(viewport.height * 100 / viewport.width).toFixed(5)}%`;
$viewport.style.overflow = "hidden";
$viewport.style.height = 0;
@ -233,8 +234,6 @@ function createScanner(pixelCapturer) {
return pixelCapturer.grabFrameData({clipping: calculateClipping})
.then((bitmap) => {
if (bitmap) {
//console.log(bitmap.dimensions);
// adjust image size!
if (availableWorker) {
availableWorker.imageData = bitmap.data;
availableWorker.dimensions = bitmap.dimensions;
@ -428,13 +427,16 @@ function createScanner(pixelCapturer) {
if (imageWrapper) {
_onUIThread = false;
initBuffers(imageWrapper);
return Promise.resolve();
} else {
adjustWorkerPool(0);
return setup(_config);
}
return Promise.resolve();
},
start: function() {
if (_onUIThread) {
adjustWorkerPool(0);
return source.waitUntilReady()
.then(setup.bind(null, _config))
.then(start);
}
start();
},
isRunning: function() {
@ -447,6 +449,7 @@ function createScanner(pixelCapturer) {
if (source.getScope() === Scope.INTERNAL) {
source.stop();
}
_events.publish("stopped");
},
applyConfig(newConfig) {
return this.init(newConfig);
@ -454,8 +457,11 @@ function createScanner(pixelCapturer) {
pause: function() {
_stopped = true;
},
subscribe(eventName, callback) {
_events.subscribe(eventName, callback);
subscribe(eventName, callback, once = false) {
if (!once) {
return _events.subscribe(eventName, callback);
}
_events.once(eventName, callback);
},
unsubscribe(eventName, callback) {
_events.unsubscribe(eventName, callback);
@ -474,7 +480,7 @@ function createScanner(pixelCapturer) {
}
return reject(result);
}, true);
start();
this.start();
});
},
canvas: _canvasContainer

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