124 lines
3.0 KiB
QML
124 lines
3.0 KiB
QML
pragma Singleton
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import QtQuick 2.0
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Item {
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id: backpressure
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property var _timers: ({})
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property int _nextId: 0
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function setTimeout(owner, timeout, callback) {
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var tid = ++_nextId;
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var cleanup = function() {
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if (tid !== null) {
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clearTimeout(tid);
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}
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}
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if (!owner) {
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owner = backpressure;
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}
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owner.Component.onDestruction.connect(cleanup);
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var obj = Qt.createQmlObject('import QtQuick 2.0; Timer {running: false; repeat: false; interval: ' + timeout + '}', backpressure, "setTimeout");
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obj.triggered.connect(function() {
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callback();
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obj.destroy();
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owner.Component.onDestruction.disconnect(cleanup);
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delete _timers[tid];
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});
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obj.running = true;
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_timers[tid] = obj;
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return tid;
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}
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function clearTimeout(timerId) {
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if (!_timers.hasOwnProperty(timerId)) {
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return;
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}
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var timer = _timers[timerId];
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timer.stop();
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timer.destroy();
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delete _timers[timerId];
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}
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function oneInTime(owner, duration, callback) {
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var pending = false;
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var timerId = null;
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return function() {
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if (pending) {
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return;
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}
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pending = true;
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var args = arguments;
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callback.apply(null, args);
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timerId = setTimeout(owner, duration , function() {
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pending = false;
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}, duration);
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}
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}
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function promisedOneInTime(owner, callback) {
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var q = priv.loadPromiseLib();
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var promise = null;
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return function() {
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var args = arguments;
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if (promise !== null) {
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return q.rejected();
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}
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promise = q.promise(function(fulfill, reject) {
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fulfill(callback.apply(null, args));
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});
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promise.then(function() {
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promise = null;
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}, function() {
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promise = null;
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});
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return promise;
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};
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}
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function debounce(owner, duration, callback) {
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var timerId = null;
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return function() {
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var args = arguments;
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if (timerId !== null) {
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clearTimeout(timerId);
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}
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timerId = setTimeout(owner, duration, function() {
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timerId = null;
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callback.apply(null, args);
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});
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}
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}
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QtObject {
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id: priv
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property var q: null
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function loadPromiseLib() {
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if (q !== null) {
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return q.q;
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}
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q = Qt.createQmlObject('import QtQuick 2.0; import QuickPromise 1.0; Item { property var q: Q;}', backpressure);
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if (q.hasOwnProperty("qmlErrors")) {
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console.error("Backpressure: Failed to load QuickPromise. Please check your installation.");
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}
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return q.q;
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}
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}
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}
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