Commit Graph

47783 Commits

Author SHA1 Message Date
Lars Knoll
2caa2faf01 Remove two obsolete #defines
Change-Id: Icc13408cfdb8ce0db6f274904c3e44f8376cd1e5
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
2020-09-06 00:17:09 +02:00
Lars Knoll
ff69227a49 Cleanup QSemaphore and make it always 64bit large
This simplifies the implementation so that we don't
need separate code paths for 32 and 64 bit anymore.

Change-Id: I823612865e7d648fb0bd1632385ce67b5a452b8a
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
2020-09-05 17:51:22 +02:00
Lars Knoll
1cf08cbc5b Cleanup a ### Qt 6
Change-Id: If9dd04e25ddc5164cc23ac7d5684254e38b7eda6
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
2020-09-05 17:51:10 +02:00
Marcel Krems
996e08734e Remove /INCREMENTAL:YES from linker flags
This flag doesn't exist in MSVC 2015+:
LINK : warning LNK4224: /INCREMENTAL:YES is no longer supported;  ignored
https://docs.microsoft.com/en-us/cpp/build/reference/incremental-link-incrementally?view=vs-2015

Change-Id: I3b2aace619351e2dc9cc86e1df28facc21b7d9fe
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
2020-09-05 15:12:50 +00:00
Giuseppe D'Angelo
2ab91dd68e tst_qdbuscpp2xml: stop doing math on enumerations
Cast it to int to do math.

Change-Id: Ia553cccb7e160df50e77fba63d66d0ed45c246c2
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
2020-09-05 17:12:50 +02:00
Wang Peng
2ee5449aca QCompleterItemDelegate: replace QItemDelegate with QStyledItemDelegate
Resolve remaining Qt6 TODOs

Change-Id: Ice8dae2f1cbd3ed452ab78d5d7735127d7662900
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
2020-09-05 23:12:50 +08:00
Wang Peng
bb3cdd6e3a QCalendarDelegate: replace QItemDelegate with QStyledItemDelegate
Resolve remaining Qt6 TODOs

Change-Id: I018ef5e3761816dce052a78be3dcd07ede866135
Reviewed-by: JiDe Zhang <zccrs@live.com>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
2020-09-05 23:12:49 +08:00
Fabian Kosmale
7505422bbf QMetaType: optimize comparison
We can skip the id calls if we know that the pointers are equal.

Change-Id: I62f9cac557d7b82b640a143965f9056a8cd46028
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
2020-09-05 09:33:29 +00:00
Jarek Kobus
8ef41d1713 Use QList instead of QVector in qmake
Task-number: QTBUG-84469
Change-Id: I4a3da94702f1dad1ee10b1ba3c6712b6f40338c9
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
2020-09-05 07:07:44 +02:00
Andy Shaw
973a795bec When finding the engine for a fallback font, then clear the families
If it is a fallback font, then it should just have family set to that
font so it does not get interference from what the families were
originally set to.

Fixes: QTBUG-85560
Change-Id: I6232f3d2ae12052fa3b0b3bc0e7f106e239a585d
Pick-to: 5.15
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>
2020-09-05 05:22:45 +02:00
Lars Knoll
247c10bf4c Get rid of the MSVC specific file
It used to contain the MSVC specific export hack for QVector,
but that one is not required in Qt 6 anymore and the file
was not doing anything anymore.

Change-Id: Ic8b4aa355a8934beb6abcf10235d218344a294cc
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
2020-09-05 02:12:15 +02:00
Christian Ehrlicher
99e52b368e QStyle: remove deprecated SH_SpellCheckUnderlineStyle
It was deprecated with 88e6f8cff2 and is
not used anywhere anymore so it can be safely removed.

Change-Id: If4050ac8bf116fb31491b3b08096554c5ea3e4d5
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
2020-09-05 02:09:51 +02:00
Lars Knoll
bbc19bd979 Make test pass on machines with many cores
Just starting 20 threads to test this won't cut it if
the machine you're testing on has an ideal thread count
of 16 or larger.

Change-Id: Icba8f00aa836fec6da41c71b318e9e17bdd47c0e
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
2020-09-05 02:08:49 +02:00
Edward Welbourne
3d7d8346dd Remove some comments that are no longer relevant
Task-number: QTBUG-85700
Change-Id: I5ce368e8edca2b9483a0f0ef34bc9eb6b4e44574
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
2020-09-05 02:08:29 +02:00
Lars Knoll
db61425225 Remove some obsolete code
Those checks aren't required anymore for Qt 6.

Change-Id: Ida9f93544f42cb03723659a81e0094aa0cf14799
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
2020-09-05 02:07:29 +02:00
Giuseppe D'Angelo
e6c9ef72a9 QWindowsKeyMapper: fix mixed math between int and enum/flags
Either do it between ints, or cast to the right types before
doing it. This should enable removing operator+ and - between
int and QFlags.

Change-Id: I30ecc03566cff8ce880b048ba3a9d7d50f3c8509
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
2020-09-05 02:06:54 +02:00
Volker Hilsheimer
0f39cfae93 Change QWidget::enterEvent signature to take a QEnterEvent
This is a source incompatible change for widget implementors.
Leaving the old enterEvent as a virtual overload is problematic due to
shadowing. Best to make a clean cut, widget reimplementors will get a compile
time warning if they mark their override as such, or if they try to call the
parent class implementation.

Addresses ### Qt 6 comment.

[ChangeLog][QtWidgets][QWidget] The virtual enterEvent handler now receives
a QEnterEvent, which contains information about mouse position and button
states, rather than a plain QEvent.

Change-Id: I233f594fd79c0c090983b3db8532913d00132fde
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
2020-09-05 02:06:26 +02:00
Volker Hilsheimer
403b01f866 Change translation context of strings to new class
The strings were in QFileDialog context even though they were in
QFileIconProvider, probably for historical reasons.

Now that the strings have been moved into QtGui, using a QtWidgets class
as the context makes no sense.

Change-Id: Ia4f3bd18abaab2a5fbbb94e945782f4d2d94e7d1
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
2020-09-05 02:03:58 +02:00
Volker Hilsheimer
455d811b58 Fix compiler warnings from using deprecated qChecksum overload
Change-Id: Ib7a6d0e752dc662a42abe38f2010da3f2b4626f1
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
2020-09-05 02:03:49 +02:00
Volker Hilsheimer
78695bbf19 Fix compiler warnings after QKeyCombination introduction
Change-Id: If5d7c5e037b99c14c51d83adf8b1e20d6b924bc5
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
2020-09-05 02:03:40 +02:00
Volker Hilsheimer
c549c35408 Fix compiler warning from unused private field in QSequentialIterable
Change-Id: I9c330b4f99f77404eacda2506d264f917f9e1161
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
2020-09-05 02:03:31 +02:00
Liang Qi
c91d1fdc10 xcb: drop Xinerama support
[ChangeLog][Important Behavior Changes][X11] Xinerama is no longer
supported.

Fixes: QTBUG-86082
Change-Id: Ieb57d9035e1659fc22bf8333247fc3573fb62992
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
Reviewed-by: Gatis Paeglis <gatis.paeglis@qt.io>
2020-09-04 17:28:49 +00:00
Liang Qi
d85bc34b79 Fix memory sanitizer complaint about uninitialized value
Fixes: QTBUG-86383
Pick-to: 5.15
Change-Id: Ib2bbe5d8e11574456fdc8b5c5fb07f5e41b538b3
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
2020-09-04 19:28:48 +02:00
Volker Hilsheimer
c87b626d70 Merge QPainterPathPrivate and QPainterPathData
As per ### Qt 6 comment, and the code that never allocated QPainterPathPrivate.

Change-Id: I553e3559fdb2a675f37cdd9855462a2f22ef84c6
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>
2020-09-04 08:38:10 +02:00
Volker Hilsheimer
00a5629d8d Remove deprecated QPrinter and QPagedPaintDevice APIs
Adjusting the QPrinter test case - some use cases no longer exist, or are
already tested in QPageSize and QPageLayout tests.

Adjust examples and manual tests.

Change-Id: I01cbc65f3d8031aea2dac86dd942126ba708b111
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
2020-09-04 08:37:59 +02:00
Lorn Potter
6b171dc6c0 wasm: enable httpmultipart
This allows for multipart requests.

Change-Id: I1206d160cfd9150a9627c36ed60ea4cbb58e95aa
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
2020-09-04 12:33:21 +10:00
Jarek Kobus
225cc60954 Fix flaky QFutureWatcher::startFinish() test
Since waiting for a spy employs polling, it may happen
that while waiting for a startedSpy we had received already
a signal for finishedSpy. This explains current flakiness.

The fix is to connect to lambdas instead and update
the hit count accordingly. Inside lambdas we also
ensure the correct order for started / finised signals.

After waitForFinished() unblocks we ensure that possible
pending asynchronous signals (started / finished) are processed
and check the final state.

Task-number: QTBUG-83076
Change-Id: I16963ef9c011cb613d7b409d3e3032303a942336
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
2020-09-03 20:45:00 +02:00
Volker Hilsheimer
85b0335c41 Tighten up QDialogButtonBox::ButtonLayout enum
... and the equivalent enum in QPlatformDialogHelper.

No need to keep numerical values the same anymore.
Remove ### Qt 6 comment.

Change-Id: Ib369ea6ca2362f6ab0f71a3a6c90c4adaa7f11cd
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
2020-09-03 18:51:41 +02:00
Volker Hilsheimer
f51b690e91 Remove timeStep parameter from QAnimationDrive::advanceAnimation
Addresses ### Qt 6 comment, and documentation pointing out that the parameter
value is ignored. It wasn't ignored in the code, but that's the kind of change
we can make now.

With this change, QUnifiedTimer::updateAnimationTimers is only called with -1
as the currentTick input parameter, also from Qt Declarative. Make it default,
so that leaf modules can be fixed. Once that it done, the parameter can be
removed completely.

Change-Id: I80c57ff92f3b615b932dd73d711cf6397347efd8
Reviewed-by: Jan Arve Sæther <jan-arve.saether@qt.io>
2020-09-03 18:43:22 +02:00
Tasuku Suzuki
21de5aa1ac Fix build without features.highdpiscaling
Broken since 37d5aaa4b4

Change-Id: Id741f23ccae4f619e6a389ee71b3e7fe0c599989
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
2020-09-04 00:33:50 +09:00
Morten Johan Sørvig
fdb442a72a Remove obsolete native client platform
Change-Id: Ia27cfbb618d216c371a0f8210f0bec483d4f15db
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
2020-09-03 14:51:13 +02:00
Tor Arne Vestbø
f4c58b79a7 Extend test blacklisting from Ubuntu 18.04 to 20.04
Task-number: QTBUG-86187
Change-Id: I3ac3233f7355d1c16bc9bf6e052fdf4bd9ea90de
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
2020-09-03 14:30:04 +02:00
Giuseppe D'Angelo
d5db4ab46d QCocoaKeyMapper: do not sum integral+QFlags
It will become illegal; keep the semantics but force the
right casts.

Change-Id: I4002c5bca6eb90e798e35ca263e7bbb4ff5ad4b1
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
2020-09-03 14:29:47 +02:00
Laszlo Agocs
f6802a5aac rhi: Sanity check the srb in debug builds
Instead of cryptic assertions and crashes depending on the backend,
show some useful warnings (in debug builds only) when one tries to
create an srb with a list where there are duplicated bindings. (a
mistake that happens relatively often during the development of
frameworks, such as Quick 3D, on top)

Change-Id: If1b50a2e8165b001878ad566e048f146e636514f
Reviewed-by: Andy Nichols <andy.nichols@qt.io>
2020-09-03 14:18:30 +02:00
Lars Knoll
95daeb2407 Add QByteArrayView overloads for push_back and push_front
Change-Id: If70f3ac6764958d92dcbab44432b4f4994d20405
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Sona Kurazyan <sona.kurazyan@qt.io>
2020-09-03 14:15:53 +02:00
Lars Knoll
8897aa071a Clean up the QByteArray API and implementation
Add overloads using a QByteArrayView where it makes sense, and
call those inline from the other overloads. Remove overloads
that are not required anymore (due to implicit conversion of
a const char * to a QByteArrayView).

Guard all implementations against passing this object to them.

Change-Id: I930156f8b05ce72c32cb8201c70513f2e6e19d3e
Reviewed-by: Andrei Golubev <andrei.golubev@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
2020-09-03 14:15:52 +02:00
Mårten Nordheim
8eef75f0b5 QList/QByteArray/QString: Base GrowsBackwards heuristic on old size
If you grow from 10 to 100 characters then even if the point of
insertion was the end then it will get the GrowsBackwards option on
realloc. By basing it on the oldSize the intention of the position to
insert at is better clarified.

Change-Id: Ia73f4902e8356d94709556de5704cbfa0e1a3a56
Reviewed-by: Andrei Golubev <andrei.golubev@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
2020-09-03 14:15:32 +02:00
Fabian Kosmale
69d239ef00 Enforce complete method types of QML registered classes
For QML, we like to avoid doing string to type lookups at runtime as
much as possible. Therefore, QML registration macros like QML_ELEMENT
now cause moc to require complete types not only for properties, but
also for all methods known to the metatype system.

Change-Id: Ied3d940c102719db4852d3a748d05be1f415b353
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
2020-09-03 09:46:57 +02:00
Tasuku Suzuki
905d4e4eee Fix build without features.filesystemmodel
94dcb5454f breaks the build indirectly

Change-Id: Iba76a76fd14e65a7eb230c53608e405bd821ef74
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
2020-09-03 16:27:42 +09:00
Ulf Hermann
53fde3c573 Reimplement QSequentialIterable using QMetaSequence
Change-Id: Ie721a5f0caa697c4bf15a81f3762cf79d3c54f5a
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
2020-09-03 08:27:44 +02:00
Eskil Abrahamsen Blomfeldt
0e0149c64d Ignore weight in .ui files instead of converting it
In 3558704ed5, we added code to
support old .ui files which used the old integer scale for font
weights by checking for a special attribute which would help
separate new and old files.

Since then, it has become apparent that the weight element in
.ui is not actually used for anything, since it is only emitted
when the bold flag is set and always has to match QFont::Bold
in these cases.

So instead of converting, we simply ignore it now, and respect
the bold flag instead.

This also reverts the changes to ui4.* in uic, since the
scale attribute is no longer needed.

Task-number: QTBUG-42248
Change-Id: I1898868b58004099590f4eaf01f24c57bd34d779
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
2020-09-03 07:31:45 +02:00
Volker Hilsheimer
6bbf3f0257 Mark obsolete QPrinter functions as deprecated from 5.15 on
Some of the methods are overrides of virtuals in QPagedPaintDevice, so document
and mark those as obsolete as well.

Adjust code that calls those APIs to use the recommended replacement.

Change-Id: I3cd1980609ea20808d17379a5f97ca595e869875
Pick-to: 5.15
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
2020-09-03 07:00:36 +02:00
Giuseppe D'Angelo
25351dcc54 Long live QKeyCombination!
C++20 via P1120 is deprecating arithmetic operations between
unrelated enumeration types, and GCC 10 is already complaining.
Hence, these operations might become illegal in C++23 or C++26 at
the latest.

A case of this that affects Qt is in key combinations: a
QKeySequence can be constructed by summing / ORing modifiers and a
key, for instance:

  Qt::CTRL + Qt::Key_A
  Qt::SHIFT | Qt::CTRL | Qt::Key_G (recommended, see below)

The problem is that the modifiers and the key belong to different
enumerations (and there's 2 enumerations for the modifier, and one
for the key).

To solve this: add a dedicated class to represent a combination of
keys, and operators between those enumerations to build instances
of this class.

I would've simply defined operator|, but again docs and pre-existing
code use operator+ as well, so added both to at least tackle simple
cases (modifier + key).

Multiple modifiers create a problem: operator+ between them yields
int, not the corresponding flags type (because operator+ is not
overloaded for this use case):

  Qt::CTRL + Qt::SHIFT + Qt::Key_A
  \__________________/      /
          int              /
           \______________/
                  int

Not only this loses track of the datatypes involved, but it would
also then "add" the key (with NO warnings, now its int + enum, so
it's not mixing enums!) and yielding int again.

I don't want to special-case this; the point of the class is
that int is the wrong datatype. Everything works just fine when
using operator| instead:

  Qt::CTRL | Qt::SHIFT | Qt::Key_A
  \__________________/      /
      Qt::Modifiers        /
           \______________/
            QKeyCombination

So I'm defining operator+ so that the simple cases still work,
but also deprecating it.

Port some code around Qt to the new class. In certain cases,
it's a huge win for clarity. In some others, I've just added
the necessary casts to make it still compile without warnings,
without attempting refactorings.

[ChangeLog][QtCore][QKeyCombination] New class to represent
a combination of a key and zero or more modifiers, to be used
when defining shortcuts or similar.

[ChangeLog][Potentially Source-Incompatible Changes] A keyboard
modifier (such as Qt::CTRL, Qt::AltModifier, etc.) should be
combined with a key (such as Qt::Key_A, Qt::Key_F1, etc.) by using
operator|, not operator+.  The result is now an object of type
QKeyCombination, that stores the key and the modifiers.

Change-Id: I657a3a328232f059023fff69c5031ee31cc91dd6
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
2020-09-03 07:00:31 +02:00
Edward Welbourne
f03b2f7711 Turn QFileDevice::MemoryMapFlags into a proper QFlag
Task-number: QTBUG-85700
Change-Id: I2a741b67927fa7185acece51d774b90b0b88c705
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
2020-09-02 21:53:42 +00:00
Joerg Bornemann
067fb7915a pro2cmake: Fix qmake parser's line continuation handling
The qmake parser of pro2cmake handles completely commented lines to make
assignments like this work:

    SUBDIRS = \
       foo \
    #  bar \
       bar

However, assignments like

    SUBDIRS = \
       foo \
       #bar \
       bar

were cut off at the commented line.

Fix this by allowing leading whitespace for "fully commented lines".

Change-Id: Ib5de850a02fd9b9ebb7c056c2f64f9d684334b08
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
2020-09-02 23:44:15 +02:00
Joerg Bornemann
46f8c46bee CMake: Teach QtProcessConfigureArgs.cmake to configure other modules
Until now, QtProcessConfigureArgs.cmake could only handle qtbase and the
top-level build. Add the variable MODULE_ROOT that the user can point to
the module that is to be configured.

Example - QtDeclarative can now be configured like this:

cd qtdeclarative-build-dir
echo -qml-network > config.opt
cmake -DOPTFILE=config.opt -DMODULE_ROOT=<source-root>/qtdeclarative \
    -DCMAKE_COMMAND=<install-prefix>/bin/qt-cmake-private \
    -P <source-root>/qtbase/cmake/QtProcessConfigureArgs.cmake

A convenience script that saves the user from entering this unwieldy
incantation will be added in a subsequent commit.

Change-Id: If46103de3a8eb84b15e7600ebfec25544451e1d5
Reviewed-by: Cristian Adam <cristian.adam@qt.io>
2020-09-02 23:44:03 +02:00
Andrei Golubev
27fed69d0a QString/QList: disregard space at front during reserve()
Aligned QString, QList to the new agreed upon behavior

Aligned QList::resize() along the way to be consistent with QString/QBA

Task-number: QTBUG-84320
Change-Id: Ie9d7b4b6ebe54bd373af78d92906144b383bbfe2
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
2020-09-02 23:10:25 +02:00
Mårten Nordheim
b98b7de0da QByteArray: Disregard space at front during ::reserve(...)
Traditionally when calling reserve it's because you expect to append
up to X amount of bytes. We should keep that behavior the same.

With another patch still in the works current behavior caused an issue
with QStringBuilder in QNAM, as mirrored in the testcase attached.

Change-Id: I9792a8f158fc9235e3de48ac8b06ac2c10e7f3dc
Reviewed-by: Andrei Golubev <andrei.golubev@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
2020-09-02 23:10:21 +02:00
Giuseppe D'Angelo
39e07ebf64 Long live QAIM::multiData!
Views / delegates absolutely *adore* hammering data(). A simple
QListView showing a couple of dozens entries can call data()
a hundred of times on the first show.

Back of the hand calculation,

* 2 times per visible item (sizeHint() + paint()),
* times 9 roles used by the default delegate,
* times 20 visible items

= 360 as a bare minimum, assuming the view doesn't redraw twice
accidentally. Move the mouse over the view, and that'll cause
a full update with certain styles: 360 calls to data() per update.

This has an overhead visible in profilers. The model's data()
has to re-fetch the index from its data structure and extract
the requested field every time.

Also, QVariant is used for the data interexchange,
meaning anything that won't fit in one is also a memory allocation.
This problem will likely be gone in Qt6Variant as that
will store sizeof(void*) * 3, meaning QImage/QPixmap and similar
polymorphic classes will fit in a QVariant now...

So I'm trying to to remove part of that overhead by allowing
views to request all the data they need in one go. For now,
one index a a time.

A view might also store the data returned. The idea is that
the same role on different indexes will _very likely_
return variants of the same type. So a model could move-assign
the data into the variant, avoiding the memory allocation
/deallocation for the variant's private.

This patch:

1) Introduces QModelRoleData as a holder for role+data.

2) Introduces QModelRoleDataSpan as a span over QModelRoleData.
The idea of a span type is twofold. First and foremost, we are
in no position to choose which kind of container a view should
use to store the QModelRoleData objects for a multiData() call;
a span abstracts any contiguous sequence, leaving the view free
to do whatever it wants (statically allocate, use a vector, etc.).
It also solves the problem of efficient passing the roles and
gathering the returned variants from multiData().

3) Add multiData(), which populates a span of roles for a given
model index. The main advantage here is that a model can fetch
all the needed information for a given index just once, then
iterate on the span and provide data for each requested role.
Cf. this with data(), where every call has to re-fetch
the information for the index.

A couple of models have been ported to multiData(), as well as
QStyledItemDelegate.

[ChangeLog][QtCore][QModelRoleData] New class.

[ChangeLog][QtCore][QModelRoleDataSpan] New class.

[ChangeLog][QtCore][QAbstractItemModel] Added the multiData()
function.

Change-Id: Icce0d108ad4e156c9fb05c83ce6df5f58f99f118
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
2020-09-02 22:51:42 +02:00
Fabian Kosmale
19874d6a63 QVariant: Fix conversion code
Fixes: QTBUG-86330
Change-Id: Ib89dcf1195e0081b4c4e2845f90c52c612e5911a
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
2020-09-02 22:50:50 +02:00