Qt Virtualkeyboard example

[Johannes Kliemann]

Hi Christian,

I finally got the plugin to load.
What was missing was the correct initialization in QNitpickerIntegration.
I have added the missing parts to load the QPlatformInputContext [1] and
it now finds the qtvirtualkeyboardplugin.

It isn't completely working yet but at least the application shows up.
What is missing are the dependencies. They require additional shared
libs. I tried to create the according make fragments with your script
but after applying qtbase_generated.patch the configure script fails to
generate qmake with

> You cannot make a shadow build from a source tree containing a previous build.

on a clean (except that patch) source tree. Do you have any idea about that?

Regards,
Johannes

[1]:
https://github.com/jklmnn/genode/commit/676df58996fe0f9958da49116ee5317edb8226cd

Am 09.08.2017 um 09:58 schrieb Johannes Kliemann:
> Hi Christian,
> 
> I tried to build the plugin statically but that seems to depend on
> static builds of its dependencies (which wouldn't be a big problem) and
> the QtQuick2 plugin itself.
> 
> I recreated the directory structure from Linux
> (qml/QtQuick/VirtualKeyboard/qmldir) but it still fails to find the
> plugin. Even if dynamically loading it is a problem, shouldn't Qt find
> the plugin first and then fail to load it?
> 
> Regards,
> Johannes
> 
> Am 02.08.2017 um 19:27 schrieb Christian Prochaska:
>> Hi Johannes,
>>
>> On 31.07.2017 15:20, Johannes Kliemann wrote:
>>> after applying your commit and fixing the vpaths for the plugin
>>> directory it compiles but it still fails to find the
>>> qtvirtualkeyboardplugin.
>>
>> from looking at what gets built and installed with Qt for Linux, it
>> seems there are actually multiple plugins involved that need to be
>> ported to Genode: one Qt plugin (the one you ported) and multiple
>> QtQuick plugins (QtQuick.Layouts, QtQuick.Virtualkeyboard.Styles,
>> Qt.labs.folderlistmodel). The layout of the 'qml' directory must
>> probably match the one on Linux (/usr/local/Qt-5.8.0/qml), with a
>> 'qmldir' file in each sub directory, for the QtQuick plugins to be
>> found. The Qt plugin was installed at
>> '/usr/local/Qt-5.8.0/plugins/platforminputcontexts/libqtvirtualkeyboardplugin.so'
>> on Linux, but I'm not sure if our Qt port can load non-QtQuick plugins
>> with 'dlopen()' yet, so I would first try to use it as a static plugin,
>> like it is done with the qjpeg plugin. This usually means adding an
>> extra file to register the plugin at program start (see
>> 'repos/libports/src/lib/qt5/qtbase/src/plugins/imageformats/jpeg/import_plugin.cc').
>>
>> Regards,
>> Christian
>>
>>
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