Can't input Chinese in QPlainTextEdit

wij2

I have a small text editor program using QTextEdit. When I
changed to using QPlainTextEdit, it interpreted the keystrokes (in
Chinese input mode) as normal latin1 characters!!! Can anyone help
solving this problem. I am using Fedora29 and Qt5.

SGaist

Hi,

What happens if you load a text containing chines characters in that widget ?

wij2

In almost aspects (display, find,...) QTextEdit and QPlainTextEdit
behave the same in my simple editor. Except Chinese can't be keyed
in if switched to using QPlainTextEdit.

aha_1980

@wij2 which Qt version is that exactly?

wij2

[wij2@localhost]$ qmake-qt5 --version
QMake version 3.1
Using Qt version 5.11.3 in /usr/lib64

SGaist

Did you check the bug report system ?

wij2

I checked the indicated web page just now, nothing relevant (keyword=QPlainTextEdit)

The following are messages dumped on the terminal, hope it could provide more hints: (Except the issue that Chinese can't be input in QPlainTextEdit, the other one is Segmentation fault after su)

[wij2@localhost]$ env | grep SESSION
XDG_SESSION_ID=2
DESKTOP_SESSION=gnome
XDG_SESSION_TYPE=wayland
XDG_SESSION_DESKTOP=gnome
GDMSESSION=gnome
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
SESSION_MANAGER=local/unix:@/tmp/.ICE-unix/1596,unix/unix:/tmp/.ICE-unix/1596
[wij2@localhost]$ ./simple_qed
Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
^C
bash: history: write error: Success
[wij2@localhost]$ su
Password:
[root@localhost]# ./simple_qed
Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
Qt: Session management error: None of the authentication protocols specified are supported
Segmentation fault
[root@localhost]#

Zorcs

Same problem：

At first, I can't input Chinese in anywhere cause my ubuntu don't have this support：

libfcitxplatforminputcontextplugin.so

You can check this by：

dpkg -L fcitx-frontend-qt5 | grep .so

to find where's the .so file. If not, just install it：

sudo apt-get install fcitx-frontend-qt5

And next, you should copy this .so file to your Qt install package path, like this：

$ cd Qt5.9.0/Tools/QtCreator/lib/Qt/plugins/platforminputcontexts/
$ cp /usr/lib/x86_64-linux-gnu/qt5/plugins/platforminputcontexts/libfcitxplatforminputcontextplugin.so .

Don't forget：chmod +x libfcitxplatforminputcontextplugin.so
Finally, restart Qt Creator and you can input Chinese in your code now.

However, sadly, I can't input Chinese in QPlainTextEdit. Need Help！