Create a QFileDialog with similar behavior as the static function getExistingDirector

[stereoMatching]

os : win7 64bits
Qt : Qt5.2

part 1

dir_ = QFileDialog::getExistingDirectory(this, tr("Open Directory"),
                                             dir_,
                                             QFileDialog::ShowDirsOnly
                                             | QFileDialog::DontResolveSymlinks);

dir_ = QFileDialog::getExistingDirectory(this, tr("Open Directory"),
                                             dir_,
                                             QFileDialog::ShowDirsOnly
                                             | QFileDialog::DontResolveSymlinks);

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part 2

QFileDialog dialog(nullptr, tr("Open Directory"));
    dialog.setAcceptMode(QFileDialog::AcceptOpen);
    dialog.setFileMode(QFileDialog::DirectoryOnly);
    dialog.setOption(QFileDialog::ShowDirsOnly);
    dialog.setOption(QFileDialog::DontResolveSymlinks);
    if(dialog.exec()){
        dir_ = dialog.selectedFiles()[0];
    }else{
        dir_.clear();
    }

QFileDialog dialog(nullptr, tr("Open Directory"));
    dialog.setAcceptMode(QFileDialog::AcceptOpen);
    dialog.setFileMode(QFileDialog::DirectoryOnly);
    dialog.setOption(QFileDialog::ShowDirsOnly);
    dialog.setOption(QFileDialog::DontResolveSymlinks);
    if(dialog.exec()){
        dir_ = dialog.selectedFiles()[0];
    }else{
        dir_.clear();
    }

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part 2 work fine, but it will minimize the main window after I select the directory
part 1 would not minimize the main window after I select the directory, but I can't(or don't know)
detect the "cancel" button is pressed or not

[ChrisW67]

If the static function returns an empty string then the user pressed Cancel otherwise they pressed Ok.

part 2 work fine, but it will minimize the main window after I select the directory

The dialog has nothing to do with the minimized/normal/maximized state of the main window.

[stereoMatching]

My bad, it do not minimize the mainWindow but do not keep it as a top widget
I use raise() to solve this problem