[Interest] Myanmar-QWERTY crashes OS X application

[Timothy W. Grove]

Below is my progress thus far in trying to create a test application. 
I've created a simple app with just two QPlainTextEdit's. The only thing 
else it does is to print out the name of the keyboard input source 
associated with a QPlainTextEdit when you click into it. I'm unsure how 
to translate the python code for changing the keyboard into C++ but I've 
added comments to the "MainWindow::changeKeyboard" method below to show 
my approach in python. Any help or suggestions would be most welcome.

Best regards,
Tim

mainwindow.h:

#ifndefMAINWINDOW_H

#defineMAINWINDOW_H

#include<QMainWindow>

#include<QPlainTextEdit>

classMainWindow:publicQMainWindow

{

Q_OBJECT

public:

MainWindow();

voidchangeKeyboard(QVariantkeyboard);

protected:

booleventFilter(QObject*obj,QEvent*event);

private:

QWidget*mainWidget;

QPlainTextEdit*textEdit1;

QPlainTextEdit*textEdit2;

};

#endif//MAINWINDOW_H mainwindow.cpp:
#include<QWidget> #include<QVBoxLayout> #include<QPlainTextEdit> 
#include<QObject> #include<QEvent> #include<QDebug> 
#include"mainwindow.h"MainWindow::MainWindow() { mainWidget=newQWidget; 
setCentralWidget(mainWidget); QVBoxLayout*layout=newQVBoxLayout; 
textEdit1=newQPlainTextEdit; 
textEdit1->setProperty("keyboard",0x00000809);//British(Windows) 
textEdit2=newQPlainTextEdit; 
textEdit2->setProperty("keyboard",0x00010C00);//Myanmar(Windows) 
layout->addWidget(textEdit1); layout->addWidget(textEdit2); 
mainWidget->setLayout(layout);textEdit1->installEventFilter(this); 
textEdit2->installEventFilter(this); } 
boolMainWindow::eventFilter(QObject*obj,QEvent*event) { 
if(obj==textEdit1||obj==textEdit2){ if(event->type()==QEvent::FocusIn){ 
changeKeyboard(obj->property("keyboard")); } } 
returnQMainWindow::eventFilter(obj,event); } 
voidMainWindow::changeKeyboard(QVariantkeyboard) { 
qDebug()<<keyboard.toString(); /* The following is how I did this in 
Python but I am unsure how to translate this into C++. A different 
approach in C++ would be okay, but it needs to be an approach I can 
translate back into Python/PyQt. from Cocoa import NSTextInputContext 
//This line goes at top of page with any other import statements ic = 
NSTextInputContext.currentInputContext() if not ic: ic = 
NSTextInputContext.new() ic.setValue_forKey_(keyboard.toString(), 
'selectedKeyboardInputSource') */ }


On 19/08/2016 16:48, timur.kristof at gmail.com wrote:
> Can you create a simple example app without Python, to see if it really is Qt's fault?
>
> (Just create an app with Qt Creator and run it. As far as I understand, you use QWidgets, right? If so, create an empty QWitgets project, run and see how it goes.)
>
> On Fri Aug 19 13:33:58 2016 GMT+0200, Timothy W. Grove wrote:
>> Changing the keyboard input source on OS X back and forth between
>> 'British' and 'Myanmar-QWERTY' crashes my PyQt v5.7 application after
>> about three changes, usually corrupting an attached sqlite database as
>> well. 'Myanmar-QWERTY' is the only input source that I'm having trouble
>> with; all others that I've tested so far appear okay. The windows
>> version of the application also seems okay. My application is fairly
>> complex, but I'm seeing this issue even with an absolute minimal app
>> containing only one window. I'm not certain if the issue is with PyQt or
>> Qt or the input source itself, but it doesn't appear to be with python
>> as a Tkinter app worked okay.
>>
>> Any answers would be great, but if anyone could suggest where to find a
>> solution that would also be helpful. This is a pretty obscure bug, but
>> finding a solution or work-around is important to the application I'm
>> developing. Thank you.
>>
>> Best regards,
>> Timothy Grove
>>
>>
>> Test program:
>>
>> #!/usr/bin/env python3
>> # -*- coding: utf-8 -*-
>>
>> import sys
>> from PyQt5.QtWidgets import QMainWindow
>> from PyQt5.QtWidgets import QTextEdit
>> from PyQt5.QtWidgets import QApplication
>>
>> class MainWindow(QMainWindow):
>>       def __init__(self, parent=None):
>>           super(MainWindow, self).__init__(parent)
>>
>>           text = QTextEdit()
>>           self.setCentralWidget(text)
>>
>> if __name__ == "__main__":
>>       app = QApplication(sys.argv)
>>
>>       mw = MainWindow()
>>       mw.show()
>>
>>       sys.exit(app.exec_())
>>
>> _______________________________________________
>> Interest mailing list
>> Interest at qt-project.org
>> http://lists.qt-project.org/mailman/listinfo/interest
>>

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