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Porting Guide: Mention QQmlListProperty change 

Change-Id: I173e2ff05b3fc3bbe56df423abcbfc84bdc2a17a
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
This commit is contained in:
Fabian Kosmale 2020-11-17 11:20:29 +01:00
parent ec4fd8832e
commit 1c32550827
1 changed files with 25 additions and 1 deletions
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src/qml/doc/src/qt6-changes.qdoc
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@ -71,7 +71,31 @@
the engine. As with \c variant properties, code that relied on implicit string conversions need
to use the corresponding functions of the Qt object.
\section1 Removed API
\section1 Source Incompatible API Changes
\section2 Changed API
\c QQmlListProperty's \c CountFunction and \c AtFunction have been changed to use \c qsizetype
instead of \c int to align with the corresponding changes in Qt's containers.
\oldcode
int myCountFunction(QQmlListProperty<MyType> *);
MyType *myAtFunction(QQmlListProperty<MyType> *, int);
QQmlListProperty<MyType> myReadOnlyList(containingObject, container, &myCountFunction,
&myAtFunction);
\newcode
qsizetype myCountFunction(QQmlListProperty<MyType> *);
MyType *myAtFunction(QQmlListProperty<MyType> *, qsizetype);
QQmlListProperty<MyType> myReadOnlyList(containingObject, container, &myCountFunction,
&myAtFunction);
\endcode
Code which needs to supports both Qt 5 and Qt 6 can either use a typedef which is \c int in Qt 5
and \c qsizetype in Qt 6, or use \c QList::size_type, which already is such a type alias.
\section2 Removed API
Various deprecated functions have been removed.