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| -rw-r--r-- | doc/src/qml/performance.qdoc | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/doc/src/qml/performance.qdoc b/doc/src/qml/performance.qdoc index 91c9bbbbd7..da9a66cbec 100644 --- a/doc/src/qml/performance.qdoc +++ b/doc/src/qml/performance.qdoc @@ -599,6 +599,30 @@ Rectangle { } \endcode +Note that this is still not as efficient as specifying a static size, so you should still specify static sizes via +the x, y, width and height properties. + +Item coordinates are always relative to their parent, so if you wanted to be a fixed offset from your parent's +0,0 coordinate you should not use anchors. For example the following items are in the same place, but the anchors +code is not as resource efficient as fixed positioning. + +\code +Rectangle { + width: 60 + height: 60 + Rectangle { + x: 20 + y: 20 + width: 20 + height: 20 + } + Rectangle { + anchors.fill: parent + anchors.margins: 20 + } +} +\endcode + \section1 Models and Views Most applications will have at least one model feeding data to a view. There are |