The QT creation window is blocked and cannot be displayed in time

When the window is dynamically created and displayed in the function , If there is intensive computing code behind , Or delay function , It will cause the created window to be blocked because it cannot be displayed in time
Such as

	m_widget = new QWidget(get_handle());
    m_widget->resize (get_handle()->width(), get_handle()->height());
    m_widget->move (0,0);
    m_widget->setStyleSheet("background-color:rgba(0, 0, 0,80%);");
    m_widget->show();
	for(i = 0;i<99;i++){
    
		...
	}

m_widget It'll be in the back for Only after the cycle ends can it be displayed ,
The solution is to run compute intensive code asynchronously , Let him not block the display of the window
Write code to function Calc

void Calc(){
    
	for(i = 0;i<99;i++){
    
		...
	}
}

Contains the header file required for asynchronous operation

#include <QtConcurrent/QtConcurrent>
#include <QFuture>

The original code is changed to

	m_widget = new QWidget(get_handle());
    m_widget->resize (get_handle()->width(), get_handle()->height());
    m_widget->move (0,0);
    m_widget->setStyleSheet("background-color:rgba(0, 0, 0,80%);");
    m_widget->show();
    
 	QFuture<void> future = QtConcurrent::run(this, &MainWindow::Calc);
	while(!future.isFinished());
	{
    
		QApplication::processEvents(QEventLoop::AllEvents,100);
	}

Then the window can be displayed immediately