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| -rw-r--r-- | src/quick/doc/src/guidelines/qtquick-bestpractices.qdoc | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/quick/doc/src/guidelines/qtquick-bestpractices.qdoc b/src/quick/doc/src/guidelines/qtquick-bestpractices.qdoc index a097ec32d3..5f7b153a7b 100644 --- a/src/quick/doc/src/guidelines/qtquick-bestpractices.qdoc +++ b/src/quick/doc/src/guidelines/qtquick-bestpractices.qdoc @@ -367,6 +367,36 @@ properties are enough. \li \l{Qt Quick Layouts Overview} \endlist +\section1 Type Safety + +When declaring properties in QML, it's easy and convenient to use the "var" type: + +\code +property var name +property var size +property var optionsMenu +\endcode + +However, this approach has several disadvantages: +\list + \li If a value with the wrong type is assigned, the error reported will point + to the location of the property declaration, as opposed to the location + where the property was assigned to. This slows down the development + process by making it more difficult to track down errors. + \li Static anaylsis to catch errors like the ones mentioned above is not + possible. + \li The actual underlying type of the property is not always immediately clear + to the reader. +\endlist + +Instead, always use the actual type where possible: + +\code +property string name +property int size +property MyMenu optionsMenu +\endcode + \section1 Performance For information on performance in QML and Qt Quick, |