Textarea slow for logging

Question

I have a Qt application and I\'d like to show some log. I use a TextArea. However, if the log is large or the events come too fast the GUI can\'t draw Te

Answer 1

However, I have included complete code, using "QAbstractListModel" for a Logging heavy data to QML

listmodel.h

#ifndef LISTMODEL_H
#define LISTMODEL_H
#include 

class ListModel: public QAbstractListModel
{
    Q_OBJECT
public:
    ListModel();

   // Q_PROPERTY(QStringList logs READ name WRITE  nameChanged)
    int rowCount(const QModelIndex & parent = QModelIndex()) const;
    QVariant data(const QModelIndex & index, int role = Qt::DisplayRole) const;
    Q_INVOKABLE QVariant activate(int i);

private:
    QStringList m_list;
};

#endif // LISTMODEL_H

listmodel.cpp

#include "listmodel.h"
#include 
#include 


ListModel::ListModel()
{
    QFile file("/home/ashif/LogFile");
    if(!file.open(QIODevice::ReadOnly))
    {
        qDebug( "Log file open failed" );
    }
    bool isContinue = true;
    do
    {
        if(file.atEnd())
        {
            isContinue = false;
        }
         m_list.append(file.readLine());
    }
    while( isContinue);
}

int ListModel::rowCount(const QModelIndex & parent ) const
{

    return m_list.count();
}
QVariant ListModel::data(const QModelIndex & index, int role ) const
{
    if(!index.isValid()) {
           return QVariant("temp");
       }
    return m_list.value(index.row());
}
QVariant ListModel::activate(int i)
{
    return m_list[i];
}

main.qml

import QtQuick 2.3
import QtQuick.Window 2.2
import QtQuick.Controls 1.4

Window {
    visible: true

    ListView
    {
        width: 200; height: 250
        anchors.centerIn: parent
        model:mylistModel
        delegate: Text
        {
            text:mylistModel.activate(index)
        }
    }
}

main.cpp

#include 
#include 
#include 
#include "logger.h"
#include "listmodel.h"

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;
    Logger myLogger;
    ListModel listModel;    
    engine.rootContext()->setContextProperty("mylistModel", &listModel);

    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
    return app.exec();
}