Commit Graph

4290 Commits

Author SHA1 Message Date
Volker Hilsheimer
124590850b Don't test for equality if types can't be compared
For types that don't have an operator==(), always trigger the binding
and the changed notification.

Task-number: QTBUG-85578
Change-Id: I41374f6d13c88106f4de83864e82172f3a248150
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
2020-07-15 16:16:53 +02:00
Fabian Kosmale
ca54b741d6 qtypeinfo: Improve container check
Smart pointers like QSharedPointer<T> do have a value_type, but their
equality does not depend on T being comparable. Therefore, instead of
simply checking for T::value_type, test for a few other container
requirements.
This also required to add an additional check for std::optional, as that
one has an unconstrained operator== on MSVC.

Change-Id: Iefd048f7aa360f4713ecd79f80acd7dae72ee18c
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
2020-07-14 17:06:47 +02:00
Edward Welbourne
bb6a73260e Support digit-grouping correctly
Read three more values from CLDR and add a byte to the bit-fields at
the end of QLocaleData, indicating the three group sizes. This adds
three new parameters to various low-level formatting functions. At the
same time, rename ThousandsGroup to GroupDigits, more faithfully
expressing what this (internal) option means.

This replaces commit 27d1391280 with a
fuller implementation that handles digit-grouping in any of the ways
that CLDR supports. The formerly "Indian" formatting now also applies
to at least some locales for Bangladesh, Bhutan and Sri Lanka.

Fixed Costa Rica currency formatting test that wrongly put a separator
after the first digit; the locale (in common with several Spanish
locales) requires at least two digits before the first separator.

[ChangeLog][QtCore][Important Behavior Changes] Some locales require
more than one digit before the first grouping separator; others use
group sizes other than three. The latter was partially supported (only
for India) at 5.15 but is now systematically supported; the former is
now also supported.

Task-number: QTBUG-24301
Fixes: QTBUG-81050
Change-Id: I4ea4e331f3254d1f34801cddf51f3c65d3815573
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2020-07-14 14:52:08 +02:00
Edward Welbourne
3f8eae848e Fix floating-point 'g'-format's choice between 'e' and 'f' forms
During review of a refactor (coming shortly), Thiago wondered what the
magic numbers were. On closer examination, I concluded that they were
wrong and wrote some tests to prove it. This commit adds those tests;
replaces the misguided old code with something that passes them; and
documents the reasons for the various parts of its decisions.

In the process, tidy up QLocaleData::doubleToString() somewhat and
rename some of its variables to conform to Qt coding style.

Change-Id: Ibee43659b1bdb0707639cdb444cfe941c31d409f
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2020-07-14 14:52:08 +02:00
Jarek Kobus
cd787dbac9 QtConcurrent: Get rid of multi-inheritance inside RunFunctionTaskBase
Use aggregation instead. Prepare for using QPromise instead of QFutureInterface.

Task-number: QTBUG-84702
Change-Id: Ic88564dca8c83a178a281cb843032292210a6d25
Reviewed-by: Sona Kurazyan <sona.kurazyan@qt.io>
2020-07-14 14:52:08 +02:00
Edward Welbourne
72be9bdd37 tst_QCollator: avoid an unused variable warning
Change-Id: Ib173df3e9b92f06935aa4de5a1d423118877ad22
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2020-07-13 12:03:21 +02:00
Sona Kurazyan
361dc074f2 Move QRegExp and its remaining mentions out of QtCore
Task-number: QTBUG-85235
Change-Id: Ibd6c98d952c1bb9916b64715c6430fb0d3fe3843
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
2020-07-13 10:53:23 +02:00
Giuseppe D'Angelo
43fa292ff6 QVariant::setValue(): enable move semantics
Given we optimize for the case where the new value is of the
same type of the one already stored in the variant, enable move
assignment for that case.

As a drive-by, avoid a path to detach() for data() if we know
we're detached.

Change-Id: I9abbdc10637ce77ebb747b49d83e1ef914d997bb
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2020-07-13 01:32:53 +02:00
Lars Knoll
9f33ad904a Move all the QProperty related code into one compilation unit
And mark some methods as inline.

Performance is critical for our new property system. Compiling
it in one unit makes it possible for the compiler to do a much
better job at inlining and generating optimized code.

Improves performance of binding evaluations by another 20%.

Change-Id: I5a2aa93c74d2b68418b0a9d2e34d8199bb71e3ad
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
2020-07-10 15:07:22 +02:00
Lars Knoll
bbfecdee1e Significantly improve performance of binding evaluation
Avoid any QVariant or type dependent code in the cpp files.
Instead, let the binding wrapper determine if the value
has changed and return true/false accordingly.

This required also some reworking of the guard mechanism
for notified properties, where the guard function wrapper
now calls first the binding evaluation function and then
passes the result to the guard.

Change-Id: I350d07a508ccc0c5db7054a0efa4f270b6a78ec3
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
2020-07-10 15:07:12 +02:00
Lars Knoll
be1ce6b269 Separate the error case when evaluating bindings
There's no point in returning a usually empty error when
evaluating bindings, adding overhead to the regular code
path.

Instead, the error can be set on the currently evaluating
binding if required. This streamlines the functor used to
wrap the binding and should thus expand to less code and
execute faster in the regular case.

To achieve this, expose a pointer to the currently evaluating
binding in the private API (as QtQml needs it to be able to
report errors).

The error case now requires one additional TLS lookup, but
we don't really care about performance in that case anyway.

Change-Id: Iecb450e765244930a41d813fcf8eb4013957a6a3
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
2020-07-10 15:07:07 +02:00
Lars Knoll
0d1208f0f0 Cleanup QPropertyBindingError
Remove location(). The method would always return an empty value. If you need the location,
the binding itself has it.

Remove setDescription() and require that the description gets passed
in the constructor. Never create a d pointer if type is NoError, so we
can quickly check for it inline.

Change-Id: I7eb8a94786281069d6ea2d82567c09aa50c52ef6
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
2020-07-10 15:07:02 +02:00
Friedemann Kleint
773a6bffd7 Tests: Use QVERIFY instead of QCOMPARE for empty lists
Pick-to: 5.15
Change-Id: I4da02fa11583eca3844bf42efcdf818b8bbd6a94
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>
2020-07-10 14:30:58 +02:00
Sona Kurazyan
577558daf5 Fix QByteArray::count implementation for longer data
The issue has been introduced when refactoring QByteArray::count
implementation (see 631127126c).

Because the last argument of QByteArrayMatcher::indexIn() method
has a defult value, it has been compiling without issues, but was being
called with incorrect size parameter. Fixed it to pass the length of the
input data correctly.

Change-Id: Ic9c2f33733131ec17276aa889f2d7ea40ec79b01
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
2020-07-09 18:38:33 +02:00
Alexandru Croitor
db397d1113 CMake: Regenerate subdir test projects
And generate a few more test projects that were missing.

Change-Id: I5df51106549aa5ae09bc3c42360e14b143719547
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
2020-07-09 09:38:39 +02:00
Alexandru Croitor
e9a328bc0e CMake: Regenerate tests with new qt_ prefixed APIs
Use pro2cmake with '--api-version 2' to force regenerate
projects to use the new prefixed qt_foo APIs.

Change-Id: I055c4837860319e93aaa6b09d646dda4fc2a4069
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
2020-07-09 09:38:35 +02:00
Alexandru Croitor
5417f1e40c CMake: Regenerate tests
This is in preparation for regenerating them with the new qt_foo
prefixed APIs.

Change-Id: Iff34932d642b1c0186ee39f952adf3ad367fd602
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
2020-07-09 09:38:31 +02:00
Fabian Kosmale
986d89c2ee Automatically register comparison operators in QMetaType
This removes the fully manual registration of comparison operators in
QMetaType and replaces it with an automatic registration through
Q_DECLARE_METATYPE().

[ChangeLog][QMetaType] The QMetaType::registerComparator() and
QMetaType::registerEqualsComparator() have been removed.
Q_DECLARE_METATYPE() now automatically registers any
operator==() and/or operator<() for a type visible where
it is used on that type, as part of declaring its meta-type.

Change-Id: I3df451b652b735c093533838bf32f3cc785439f8
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
2020-07-08 14:13:59 +02:00
Lars Knoll
16bc995fd1 Add type traits to safely determine the existence of comparison operators
Containers often define an operator==() or operator<() which is very useful
for generic code. But those operators can usually not be instantiated if
the template argument doesn't implement the operator.

This sometimes leads to the compiler trying all possible template expansions
and implicit conversions for the type, giving extremely long error
messages. The traits support can be used to safely constrain those
operators.

Being able to safely detect this will also allow us to fold the comparison
support that is currently a large cludge for user types directly into
QMetaType.

Change-Id: Ib84afb5348c3eb0be5161d6ba9d5fe237709c65f
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2020-07-08 14:13:55 +02:00
Sona Kurazyan
631127126c Introduce QByteArrayView
Created a QByteArrayView in symmetry with QStringView.
Added the basic tests symmetrical to QStringView tests.

Moved the implementations of non-modifying methods of QByteArray to
namespace QtPrivate, to be reused inline from both QByteArray and
QByteArrayView. Changed QByteArray's counterparts of those methods to
take QByteArrayView as argument instead of QByteArray. Removed
QByteArray's operator QNoImplicitBoolCast(), because it was causing
ambiguity when calling those methods with QByteArray argument (it was
there to perevnt if(!ba)/if(ba) from compiling, but currently that would
be ambiguous and won't compile anyway).

[ChangeLog][QtCore][QByteArrayView] New class.

Task-number: QTBUG-84321
Change-Id: I05f92e654cf65c95f2bb31b9c9018746ac110426
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
2020-07-08 08:45:49 +02:00
Sona Kurazyan
a55e938fb4 Add tst_QByteArrayApiSymmetry test
Created tst_QByteArrayApiSymmetry test for the common APIs  of
QByteArray and QByteArrayView. Moved the tests for startsWith(),
endsWith(), indexOf(), lastIndexOf(), compare(), from tst_QByteArray
to tst_QByteArrayApiSymmetry and adapted them to check different
QByteArray/QByteArrayView combinations. Added tests for first(),
last(), sliced(), chopped(), chop(), truncate(), count(), contains()
(test inputs are taken from corresponding tst_QStringApiSymmetry
tests).

Task-number: QTBUG-84321
Change-Id: I4e712b1692e3c1271d51ddcda6c9eb8bb01e11d4
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
2020-07-08 08:45:14 +02:00
Tor Arne Vestbø
e255146183 Replace use of deprecated Q_OS_MACX in favor of Q_OS_MACOS
Change-Id: I1059d56f67be28a4cc1a66b744e81df6d0b5d00d
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
2020-07-08 01:09:38 +02:00
Giuseppe D'Angelo
1e8d623340 QThread::create: remove the pre-C++17 codepaths
As we require C++17 now. The configure-time test checking for
future/async is left in for the moment being.

Change-Id: Ifde39d420673f70a2277f5a645bfaad30935a381
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
2020-07-07 20:54:12 +02:00
Lars Schmertmann
6ce2f3f26b Add ; to Q_UNUSED
This is required to remove the ; from the macro with Qt 6.

Task-number: QTBUG-82978
Change-Id: I3f0b6717956ca8fa486bed9817b89dfa19f5e0e1
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
2020-07-07 11:51:48 +02:00
Jarek Kobus
989fca660c Use QList instead of QVector in corelib tests
Task-number: QTBUG-84469
Change-Id: Ic80fde5517aed363f17d0da55cadcc958c3c8895
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
2020-07-07 11:48:45 +02:00
Lars Knoll
9117e3850b Rename from() to sliced()
After API discussions, agreement was that from(n) is a bad name
for the method. Let's go with sliced(n) instead.

Change-Id: I0338cc150148a5008c3ee72bd8fda96fb93e9c35
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2020-07-06 21:31:35 +02:00
Lars Knoll
792cb3989a Add support for first(n), last(n) and sliced() to QList
This keeps the API symmetric with what we have in our string
classes.

Change-Id: I94c5b39b718ca2472f9ca645e7a42e4314636f67
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2020-07-06 21:31:25 +02:00
Lars Knoll
9a9a1a2a2e Port QString to qsizetype
Change-Id: Id9477ccfabadd578546bb265a9483f128efb6736
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2020-07-06 21:31:20 +02:00
Lars Knoll
df853fed66 Use qsizetype in QList
The change creates a slight source incompatibility. The main
things to take care of are

* code using printf statements on list.size(). Using qsizetype in
printf statements will always require a cast to work on both 32
and 64 bit.
* A few places where overloads now get ambiguous. One example is
QRandomGenerator::bounded() that has overloads for int, uint and
double, but not int64.
* Streaming list.size() to a QDataStream will change the format
depending on the architecture.

[ChangeLog][QtCore][QList] QList now uses qsizetype to index into
elements.

Change-Id: Iaff562a4d072b97f458417b670f95971bd47cbc6
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2020-07-06 21:31:14 +02:00
Lars Knoll
215ca73534 Allow allocating more than 2G items in a vector
Also adjust qCalculateBlockSize() to be able to handle large
allocations.

QVector::length() is currently still limited to 2G items, that will
get changed in a later commit.

Change-Id: I3a92fbfd7f281d30844c5fafa3b9a474bc347c19
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2020-07-06 21:31:01 +02:00
Lars Knoll
fbce2e58e6 Get rid of QArrayData::sharedNull()
Remove the last places where those got used and avoid
allocations when we resize to 0.

Change-Id: Ib553f4e7ce7cc24c31da15a55a86d18bdf1cc5c3
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2020-07-06 21:30:33 +02:00
Lars Knoll
f8a53388a7 Get rid of unused flags in QArrayData
Change-Id: I3ea754b44fb33e33baba0781d9ae15b7f3b3d8eb
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2020-07-06 21:30:19 +02:00
Lars Knoll
a46caf087c Simplify Q_ARRAY_LITERAL
And clean up some unused pieces of code.

Change-Id: I285b6862dc67b7130af66d3e08f652b1a56b990e
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
2020-07-06 21:30:06 +02:00
Lars Knoll
76004502ba Get rid of shared null for QByteArray, QString and QVector
As a side effect, data() can now return a nullptr. This
has the potential to cause crashes in existig code. To work
around this, return an empty string from QString::data()
and QByteArray::data() for now.

For Qt 6 (and once all our internal issues are fixed), data()
will by default return a nullptr for a null QString, but we'll
offer a #define to enable backwards compatible behavior.

Change-Id: I4f66d97ff1dce3eb99a239f1eab9106fa9b1741a
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2020-07-06 21:29:58 +02:00
Lars Schmertmann
11b3092cc4 Refactor tst_Collections
This improves the readability and avoids code duplication
in tst_Collections::forwardDeclared. Also some warnings
are fixed:
* qSort is deprecated.
* The = operator for LargeStatic needs to be implemented
  explicitly when a copy constructor is given.
* QMap::insertMulti is deprecated, a MultiMap is required.

Task-number: QTBUG-82978
Change-Id: I577f851394edfaa30154bd3417ce391635cc546d
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
2020-07-06 09:42:36 +00:00
Lars Schmertmann
ae890390e5 Avoid use of Q_UNUSED by eliminating the parameter names
This change only happens to files touched
by the commit to add missing ; to Q_UNUSED.

Task-number: QTBUG-82978
Change-Id: I10e6993a2bb3952cf9a262708b8573550e0dbe63
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
2020-07-03 21:10:09 +02:00
Lars Schmertmann
d4c04acc65 Remove deprecated empty macro
Change-Id: Ib2a646ee22a7f97dae584e6f068f17378fe2b494
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
2020-07-02 20:51:52 +02:00
Edward Welbourne
057329c24c Make feature datetimeparser depend on feature datestring
No client of QDateTimeParser actually uses it unless datestring was
enabled, nor is it any use without datestring. Various methods
conditioned on datestring are broken unless datetimeparser is enabled.
We can't condition public API on datetimeparser, as it's a private
feature, but client code can condition use of it on the private
feature. All string-to-date/time conversions that use a string format
(this includes all locale-specific formats) depend on feature
datetimeparser.

Change #if-ery (or add it) in all client (including test) code to test
the right feature.

Tidied up some code in the process. Killed some already-redundant
textdate #if-ery. Renamed a test whose name claimed it involved
locale, which it doesn't, in the course of #if-ing it.

This simplifies the condition for feature datetimeedit (which overtly
depended on textdate, redundantly since it depends on datestring which
depends on textdate; its dependence on datetimeparser now makes its
dependency on datestring also redundant).

It also removes the need for assorted datestring checks in
QDateTimeParser itself.

Change-Id: I5dfe3a977042134b2cfb16cbcc795070634e7adf
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
2020-07-02 15:35:18 +02:00
Edward Welbourne
c30e0c656f Update tests/auto/corelib/time/'s CMake config
Recent changes in .pro files hadn't been propagated.
Re-ran pro2cmake.py and saved the results.

Change-Id: I91e4cd513329bce10ce8cbd0ddae8240af050213
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
2020-07-02 15:35:17 +02:00
Edward Welbourne
ca8b2a3632 Remove assortee pre-Qt6 code from date/time tests
Assume QT_VERSION >= QT_VERSION_CHECK(6,0,0) throughout.

Change-Id: If70c59f9319f72549de581fc446fd60d32b02521
Reviewed-by: Andrei Golubev <andrei.golubev@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
2020-07-02 11:33:01 +02:00
Edward Welbourne
da7f4a4c76 Replace a constant with a predicate function using it
Rather than naming a "GMT" string so as to repeatedly test whether a
date-time's string representation ends in it, use a simple lambda to
do the test, so that the string is only used in one place anyway.
Makes the test code more readable.

Change-Id: I5afad9ad5d58702bea7f24e5e5688ea4d738ae0d
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
2020-07-01 16:00:34 +02:00
Alexandru Croitor
5d6705c567 CMake: Skip / ignore failing tests on CMake platforms
Skip crashing tests and ignore failing tests on CMake platforms.

Add missing QTEST_ENVIRONMENT=ci env var assignment to Coin test
instructions. This was hardcoded by the Coin code for qmake
configurations.

Task-number: QTBUG-85364
Change-Id: Id2312e504a0d36b8f8596d4cebaa49c63731406e
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
2020-07-01 14:55:29 +02:00
Jarek Kobus
c70c4e4266 Use QList instead of QVector in corelib docs
Task-number: QTBUG-84469
Task-number: QTBUG-85221
Change-Id: Ieb0ba7d82409e3c053a5788a01e92ea495505643
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
2020-06-29 18:00:13 +02:00
David Faure
eb54646984 Fix QUrl::toDisplayString(PreferLocalFile) returning an encoded path
It's supposed to return the same as toLocalFile(), for local files,
which means passing QUrl::FullyDecoded just like QUrl::toLocalFile()
does.

But a few code paths were testing component formatting options without masking
other FormattingOptions like RemovePassword, so this had to be fixed.

Fixes: QTBUG-84594
Change-Id: I82f15148b6d93516200f9ad6258d474e7f10924a
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2020-06-29 16:45:31 +02:00
Alexandru Croitor
554d40da58 CMake: Skip building tst_qprocess test when cross compiling
tst_qprocess hangs on the qemu armv7 configuration.

Task-number: QTBUG-85287
Change-Id: I5a77a81a24bb1bd315edfcf14f3bcbfd5b925e4d
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
2020-06-26 14:54:32 +02:00
Lars Knoll
e81330d327 Add explicit encode()/decode() methods to QStringConverter
The functional style interface is nice, but does feel alien in some
contexts, so better also have explicit encode and decode methods.

Change-Id: Ic07ced15f65cdb3a7f1cf044041e341d2ef87f79
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>
2020-06-26 14:41:42 +02:00
Jarek Kobus
0475460102 Use QList instead of QVector in corelib
Applied to headers only. Source file to be changed separately.
Omitted statemachine for now to avoid conflicts.
Omitted qmetatype.h for now - to be handled later.

Task-number: QTBUG-84469
Change-Id: I317376037a62467c313467d92955ad0b7473aa97
Reviewed-by: Sona Kurazyan <sona.kurazyan@qt.io>
2020-06-25 22:30:59 +02:00
Simon Hausmann
b20c7df63a Remove QPropertyMemberChangeHandler again
Adding support for a static notifier within QProperty itself - through a
QProperty "sister" class - is more efficient in terms of memory
consumption and run-time performance.

The MemberChangeHandler permanently takes up at least three pointers,
while the notified properties only cost one pointer in the binding.

Change-Id: Ia1a8c2b66f1f3c2fe13ae0ad9f12cdb6bdcc35ef
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
2020-06-25 14:11:56 +02:00
Fabian Kosmale
e18a060c03 QNotifiedProperty: Add guard callback
A guard callback is a predicate which takes the new value set by
setValue or computed as the result of a binding expression. If it
returns false, the value is discarded and the old value is kept.
Note that due to lazyness, when setting a binding, we still notify
everyone as the binding is only evaluated on demand, and the guard can
thus only run when someone actually queries the value.
Note further that a guard is allowed to modify the value that is passed
to it (e.g. to clamp it to a certain range).

Task-number: QTBUG-85032
Change-Id: I3551e4357fe5780fb75da80bf8be208ec152dc2a
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
2020-06-25 14:11:56 +02:00
Fabian Kosmale
6a24ac7c4e QNotifiedProperty: pass old value to callback if requested
Check at compile time whether the static callback takes an argument
(which has to be of the same time as the type of the property). If so,
retrieve the old value and pass it to the callback.

Change-Id: Ib1c4c9e05b826b6be492b03f66fa72ad015963ee
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
2020-06-25 14:11:56 +02:00