No OnPaint Event for Qt
lazarus / 70-OpenGL

----------------------------------------------------------------------
Ocye · 2015-10-25 11:50

Simple test scenario: place a TOpenGLControl on a form, add a OnPaint
event with some code and set a breakpoint. With Gtk2 there is no
problem but on Qt the event is not fired. AFAIR it worked well (more
or less) some time ago. What can I do?

Lazarus 1.5 r50138M FPC 2.6.4 x86_64-linux-qt

plasmashell -v
>plasmashell 5.4.2
qtdiag (same for qtdiag-qt5)
>Qt 5.5.1 (x86_64-little_endian-lp64 shared (dynamic) release build;
by GCC 5.2.0) on "xcb"
>OS: Arch Linux [linux version 4.2.3-1-ARCH]

----------------------------------------------------------------------
zeljko · 2015-10-25 14:48

1. Painting in qtlcl haven't been changed for years.
2. We are using Qt4 , not Qt5 , so what's your qt4 version ?

----------------------------------------------------------------------
Ocye · 2015-10-25 21:10

Quote from: zeljko on October 25, 2015, 03:48:54 pm1. Painting in
qtlcl haven't been changed for years.Hm... I got a new PC, but updated
the KDE4 to P5 before without problems. But should double check this.
The old PC is still here.

Quote from: zeljko on October 25, 2015, 03:48:54 pm2. We are using Qt4
, not Qt5 , so what's your qt4 version ?
How to check qt4 version? qtconfig-qt4 > help tells me "This program
uses Qt version 4.8.7."

----------------------------------------------------------------------
Ocye · 2015-11-01 13:32

No success. Good scenario to test is <lazarus>/examples/openglcontrol
that uses

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i with
OpenGLControl1 do begin      OnPaint:=@OpenGLControl1Paint;which is
never called.

Quote from: ldd ./openglcontrol_demo |grep Qt        libQt4Pas.so.5 =>
/usr/local/lib/libQt4Pas.so.5 (0x00007f79e5bdd000)
        libQtWebKit.so.4 => /usr/lib/libQtWebKit.so.4
(0x00007f79e285a000)
        libQtGui.so.4 => /usr/lib/libQtGui.so.4 (0x00007f79e1b21000)
        libQtNetwork.so.4 => /usr/lib/libQtNetwork.so.4
(0x00007f79e17cd000)
        libQtCore.so.4 => /usr/lib/libQtCore.so.4 (0x00007f79e12c5000)
        libQtXmlPatterns.so.4 => /usr/lib/libQtXmlPatterns.so.4
(0x00007f79dbbda000)
        libQtOpenGL.so.4 => /usr/lib/libQtOpenGL.so.4
(0x00007f79db8d6000)

Quote from: ls -al /usr/lib/libQtOpenGL.so.4lrwxrwxrwx 1 root root 20
16. Jul 06:24 /usr/lib/libQtOpenGL.so.4 -> libQtOpenGL.so.4.8.7

Looks not suspicious, the only change left is KDE 4 to 5. Trying now
to double check with another ISO based on KDE4...

----------------------------------------------------------------------
zeljko · 2015-11-01 16:48

Qt4 version is ok. Don't know why it does not call OnPaint. Maybe you
should try same binary under some older distro with Qt-4.8.5 or
Qt-4.8.6 (virtual machine or similar). Haven't look into qt-4.8.7
changes yet, so don't know what could be the problem.

----------------------------------------------------------------------
JuhaManninen · 2015-11-01 17:02

OpenGLControl did not have any support for QT until recently. I
remember Mattias added some support.
Do you know about it Zeljko?

----------------------------------------------------------------------
Ocye · 2015-11-01 21:31

Quote from: zeljko on November 01, 2015, 05:48:27 pmMaybe you should
try same binary under some older distro with Qt-4.8.5 or Qt-4.8.6
(virtual machine or similar).Downloaded Knoppix distribution just to
face the problem that I can compile only for 64bit. ;-)

Maybe interesting as well: compiling against Qt and running this app
on MacOS works fine. But I add the full Qt repository to the app
there.