void MainWindow::changeCurrentArchive(ArchiveView * newView)
{
    if (newView) {
        handler->setCurrentArchiveView(newView);
        ui->treeView->setModel(handler->proxy());
        ui->treeView->sortByColumn(0, Qt::AscendingOrder);

        ui->treeView->resizeColumnToContents(0);
        ui->treeView->hideColumn(1);
        ui->treeView->hideColumn(2);
        ui->treeView->hideColumn(3);
}

    connect(ui->tabWidget, SIGNAL(currentChanged(int)), SLOT(changeTab(int))/*, Qt::QueuedConnection*/);

void MainWindow::open(const QString & path)
{
    qDebug() << "open";

    QString fileName = path;
    if (fileName == "")
        fileName = QFileDialog::getOpenFileName(this, tr("Select Archive File"), currentFile);
    if (fileName == "")
        return;

    openInTab(fileName);
    currentFile = fileName;
    appendCurrentFile(fileName);
    setArchiveActionsEnabled(true);
    qDebug() << "test";
    //тут уже работает!!!!
//    ui->treeView->sortByColumn(0, Qt::AscendingOrder);
//    ui->treeView->hideColumn(1); 
}

void MainWindow::openInTab(const QString & path)
{
    qDebug() << "MainWindow::openInTab";
    manager->open(path);
    QMPQAbstractEditor * editor = manager->getEditor(path);
    if (editor) {
        ui->tabWidget->addTab(editor, QFileInfo(path).fileName()); //тут эмит сигнала
        ui->tabWidget->setCurrentWidget(editor);
        editor->open(path);
    }
}

void MainWindow::changeTab(int index)
{
    qDebug() << "MainWindow::changeTab";
    QMPQAbstractEditor * editor = qobject_cast<QMPQAbstractEditor *>(ui->tabWidget->widget(index));
    Q_ASSERT(editor);

    ArchiveView * view = qobject_cast<ArchiveView *>(editor);
    if (view)
        changeCurrentArchive(view);
    disconnect(editor, 0, this, 0);
}

#ifndef QMPQABSTRACTEDITOR_H
#define QMPQABSTRACTEDITOR_H

#include <QObject>
#include <QDebug>

class QMPQAbstractEditor : public QObject
{
    Q_OBJECT
public:
    QMPQAbstractEditor();
    virtual void vopen() = 0;

public slots:
    void open() {this->vopen();}
};

class test :public QMPQAbstractEditor
{
    void vopen() {qDebug() << "lol";}
};

#endif // QMPQABSTRACTEDITOR_H

    QMPQAbstractEditor * e = new test();
    connect(ui->action, SIGNAL(triggered()), e, SLOT(open())); //печатает lol