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EDIT :: SignalSpy.qml

/**************************************************************************** ** ** Copyright (C) 2016 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the test suite of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 3 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL3 included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 3 requirements ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 2.0 or (at your option) the GNU General ** Public license version 3 or any later version approved by the KDE Free ** Qt Foundation. The licenses are as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 ** included in the packaging of this file. Please review the following ** information to ensure the GNU General Public License requirements will ** be met: https://www.gnu.org/licenses/gpl-2.0.html and ** https://www.gnu.org/licenses/gpl-3.0.html. ** ** $QT_END_LICENSE$ ** ****************************************************************************/ import QtQuick 2.0 import QtTest 1.1 /*! \qmltype SignalSpy \inqmlmodule QtTest \brief Enables introspection of signal emission. \since 4.8 \ingroup qtquicktest In the following example, a SignalSpy is installed to watch the "clicked" signal on a user-defined Button type. When the signal is emitted, the \l count property on the spy will be increased. \code Button { id: button SignalSpy { id: spy target: button signalName: "clicked" } TestCase { name: "ButtonClick" function test_click() { compare(spy.count, 0) button.clicked(); compare(spy.count, 1) } } } \endcode The above style of test is suitable for signals that are emitted synchronously. For asynchronous signals, the wait() method can be used to block the test until the signal occurs (or a timeout expires). \sa {QtTest::TestCase}{TestCase}, {Qt Quick Test} */ Item { id: spy visible: false TestUtil { id: util } // Public API. /*! \qmlproperty object SignalSpy::target This property defines the target object that will be used to listen for emissions of the \l signalName signal. \sa signalName, count */ property var target: null /*! \qmlproperty string SignalSpy::signalName This property defines the name of the signal on \l target to listen for. \sa target, count */ property string signalName: "" /*! \qmlproperty int SignalSpy::count This property defines the number of times that \l signalName has been emitted from \l target since the last call to clear(). \sa target, signalName, clear() \readonly */ readonly property alias count: spy.qtest_count /*! \qmlproperty bool SignalSpy::valid This property defines the current signal connection status. It will be true when the \l signalName of the \l target is connected successfully, otherwise it will be false. \sa count, target, signalName, clear() \readonly */ readonly property alias valid:spy.qtest_valid /*! \qmlproperty list SignalSpy::signalArguments This property holds a list of emitted signal arguments. Each emission of the signal will append one item to the list, containing the arguments of the signal. When connecting to a new \l target or new \l signalName or calling the \l clear() method, the \l signalArguments will be reset to empty. \sa signalName, clear() \readonly */ readonly property alias signalArguments:spy.qtest_signalArguments /*! \qmlmethod SignalSpy::clear() Clears \l count to 0, resets \l valid to false and clears the \l signalArguments to empty. \sa count, wait() */ function clear() { qtest_count = 0 qtest_expectedCount = 0 qtest_signalArguments = [] } /*! \qmlmethod SignalSpy::wait(timeout = 5000) Waits for the signal \l signalName on \l target to be emitted, for up to \a timeout milliseconds. The test case will fail if the signal is not emitted. \code SignalSpy { id: spy target: button signalName: "clicked" } function test_async_click() { ... // do something that will cause clicked() to be emitted ... spy.wait() compare(spy.count, 1) } \endcode There are two possible scenarios: the signal has already been emitted when wait() is called, or the signal has not yet been emitted. The wait() function handles the first scenario by immediately returning if the signal has already occurred. The clear() method can be used to discard information about signals that have already occurred to synchronize wait() with future signal emissions. \sa clear(), TestCase::tryCompare() */ function wait(timeout) { if (timeout === undefined) timeout = 5000 var expected = ++qtest_expectedCount var i = 0 while (i < timeout && qtest_count < expected) { qtest_results.wait(50) i += 50 } var success = (qtest_count >= expected) if (!qtest_results.verify(success, "wait for signal " + signalName, util.callerFile(), util.callerLine())) throw new Error("QtQuickTest::fail") } // Internal implementation detail follows. TestResult { id: qtest_results } onTargetChanged: { qtest_update() } onSignalNameChanged: { qtest_update() } /*! \internal */ property var qtest_prevTarget: null /*! \internal */ property string qtest_prevSignalName: "" /*! \internal */ property int qtest_expectedCount: 0 /*! \internal */ property var qtest_signalArguments:[] /*! \internal */ property int qtest_count: 0 /*! \internal */ property bool qtest_valid:false /*! \internal */ /*! \internal */ function qtest_update() { if (qtest_prevTarget != null) { var prevHandlerName = qtest_signalHandlerName(qtest_prevSignalName) var prevFunc = qtest_prevTarget[prevHandlerName] if (prevFunc) prevFunc.disconnect(spy.qtest_activated) qtest_prevTarget = null qtest_prevSignalName = "" } if (target != null && signalName != "") { // Look for the signal name in the object var func = target[signalName] if (typeof func !== "function") { // If it is not a function, try looking for signal handler // i.e. (onSignal) this is needed for cases where there is a property // and a signal with the same name, e.g. Mousearea.pressed func = target[qtest_signalHandlerName(signalName)] } if (func === undefined) { spy.qtest_valid = false console.log("Signal '" + signalName + "' not found") } else { qtest_prevTarget = target qtest_prevSignalName = signalName func.connect(spy.qtest_activated) spy.qtest_valid = true spy.qtest_signalArguments = [] } } else { spy.qtest_valid = false } } /*! \internal */ function qtest_activated() { ++qtest_count spy.qtest_signalArguments[spy.qtest_signalArguments.length] = arguments } /*! \internal */ function qtest_signalHandlerName(sn) { if (sn.substr(0, 2) === "on" && sn[2] === sn[2].toUpperCase()) return sn return "on" + sn.substr(0, 1).toUpperCase() + sn.substr(1) } }

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