[Qt-interest] Please explain QT_NO_CURSOR and QT_NO_QWS_CURSOR to me

[Atlant Schmidt]

Folks:

  Please ignore this incomplete message that Microsoft LookOut!
  inadvertently sent on my behalf - the real message will come soon!

                                          Atlant

________________________________
From: Atlant Schmidt
Sent: Wednesday, March 30, 2011 09:36
To: qt-interest at qt.nokia.com; qt-embedded-interest at qt.nokia.com
Subject: Please explain QT_NO_CURSOR and QT_NO_QWS_CURSOR to me

Folks:

  We have a touchscreen app running using QWS (the Qt Window
  Server) on Embedded Linux.

  Our app has a few Virtual Keyboard entry methods that use
  Qt's cursor.

  We have no need for a "mouse cursor" and so had disabled it at
  startup using QWSServer::setCursorVisible(false).
  This seemed to work "okay" but we had the known problem of
  the green 16x16 pixel region (where a cursor *MIGHT* have
  appeared) showing up at startup.

  But a while ago, we discovered that our app ran much faster if
  didn't make that call. For a while, we had a 1 pixel transparent
  cursor set as a QApplication::setOverrideCursor(my_curs);
  this worked reasonably well (but I can't recall if it still showed a
  green pixel (or 256) at startup.

  We then switched to building Qt with no cursor (-no-feature-CURSOR).
  This has the effect of asserting both QT_NO_CURSOR and QT_NO_QWS_CURSOR


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