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Enhance QWindow::devicePixelRatio() docs

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Document that fact that for non-create()'ed windows this is the
same as QGuiApplication::devicePixelRatio() which is the highest
dpr in the system. This has consequences when running with multiple
displays so application developer's have to be aware of this.

Change-Id: Ic05a18732ff021659da04428cb49421ac3453870
Reviewed-by: Morten Johan Sørvig <morten.sorvig@theqtcompany.com>
This commit is contained in:
Laszlo Agocs 2015-04-16 15:47:15 +02:00
parent 4d2b7e5f2e
commit a989e5c54f
1 changed files with 4 additions and 0 deletions
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4
src/gui/kernel/qwindow.cpp
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@ -1075,6 +1075,10 @@ Qt::ScreenOrientation QWindow::contentOrientation() const
Common values are 1.0 on normal displays and 2.0 on Apple "retina" displays.
\note For windows not backed by a platform window, meaning that create() was not
called, the function will fall back to QGuiApplication::devicePixelRatio() which in
turn returns the highest screen device pixel ratio found on the system.
\sa QScreen::devicePixelRatio(), QGuiApplication::devicePixelRatio()
*/
qreal QWindow::devicePixelRatio() const