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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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