QFileDialog problem [SOLVED]

[annettaws]

Hi,
I've an application with a QWidget that have a my personalized QWidget to show images and multiple buttons, one of it open a QFileDialog to save a file, but it does not work properly it seems that does not render correctly.
The really strange things is that if I don't open an Image in the my qwidget it work correctly, but in the other case I have this QFileDialog:
http://postimg.org/image/pz3olh7qd/
or this:
http://postimg.org/image/semsddtft/
The code is:
void AnalyzerForm::on_buttonSavePatternParams_clicked()
{
QString filename = QFileDialog::getSaveFileName(this, tr("Save file"), "./"+selectedFile, tr("_pp.yml"));
filename = filename + "_pp.yml";
controller->savePatternParams(filename.toStdString());
}
And the code to open the image is:
void CVWidget::showImage(QImage image)
{
orig_image = QPixmap::fromImage(image);
m_imageLabel->setPixmap(orig_image);
}
I tried to commented out the line with the setPixmap instruction, and the QFileDialog works.
What could be the problem between this two functions?
Sorry for my english.

[Jakob]

@annettaws Some questions that come to mind:

• which Qt version?
• How are the two pieces of code related? I don't see any call of showImage in the first part
• orig_image is not declared/defined anywhere, and doesn't look to be a member - it seems like you tried to create some minimal example, but you striped away way too much. I don't think many are capable to help you it based on this (unless someone happens to have seen the same effect and remembers why)

So maybe, expand a bit on your example, and make it into a compiling example if you can.

[annettaws]

@Jakob:
I'm using the Qt 5.4.2.
I've a QWidget and the myQWidget to show the images is a member of his ui ( I added graphicaly a widget and promoted to my class).
Below there are all the code of the two Qwidges:
CVWidget is the Widget to show Images
CVWidget::CVWidget(QWidget *parent) : QWidget(parent)
{

m_layout = new QVBoxLayout;
m_imageLabel = new QLabel;
m_layout->addWidget(m_imageLabel);
setLayout(m_layout);
startSelection = false;
corner1 = QPoint();
corner2 = QPoint();
startRadius = false;
startSearchArea = false;

}

CVWidget::~CVWidget(){}

void CVWidget::setAnalyzerForm(AnalyzerForm * analyzerForm)
{

_analyzerForm = analyzerForm;
form = 'a';

}
void CVWidget::setTrainerForm(TrainerForm * trainerForm)
{

_trainerForm = trainerForm;
form = 't';

}
void CVWidget::setController(ControllerQt * controller)
{

contr = controller;

}

void CVWidget::showImage(QImage image)
{

orig_image = QPixmap::fromImage(image);
m_imageLabel->setPixmap(orig_image);

}

QImage CVWidget::getCurrentImageShowed()
{

return m_imageLabel->pixmap()->toImage();

}
void CVWidget::mousePressEvent(QMouseEvent *mouseEvent)
{

this->setCursor(Qt::CrossCursor);
if( form == 'a')
{
    if (_analyzerForm->radioBSelectionBoxIsSelected())
    {
        startSelection = true;
        corner1 = mouseEvent->localPos().toPoint();
        _analyzerForm->showStatusBarMessage(QString("To add the Selction Box press 'a'. To store all press the button."),
            QString("red"));
    }
    if (_analyzerForm->radioBRadiusIsSelected())
    {
        startRadius = true;
        corner1 = mouseEvent->localPos().toPoint();
        _analyzerForm->showStatusBarMessage(QString("Save current MSD-PR press 'a'.After the Detection press 's' to add msd params."),
            QString("red"));
    }
    if (_analyzerForm->radioBSearchAreaIsSelected())
    {
        startSearchArea = true;
        corner1 = mouseEvent->localPos().toPoint();
        _analyzerForm->showStatusBarMessage(QString("Save the current MSD-SAR press 'a'.After the Detection press 's' to save msd params."),
            QString("red"));
    }
}

}
void CVWidget::mouseMoveEvent(QMouseEvent *mouseEvent)
{

if(form == 'a')
{
    if(startSelection && _analyzerForm->radioBSelectionBoxIsSelected())
    {
        corner2 = mouseEvent->localPos().toPoint();
        this->repaint();
    }
    if (startRadius && _analyzerForm->radioBRadiusIsSelected())
    {
        corner2 = mouseEvent->localPos().toPoint();
        this->repaint();
    }
    if (startSearchArea && _analyzerForm->radioBSearchAreaIsSelected())
    {
        corner2 = mouseEvent->localPos().toPoint();
        this->repaint();
    }
}
else if (form == 't')
{
    this->setCursor(Qt::CrossCursor);
    QPoint point = QPoint(mouseEvent->localPos().toPoint().x(),mouseEvent->localPos().toPoint().y()+10);
    _trainerForm->showStatusBarMessage(QString("Mouse move (%1,%2)").arg(point.x()).arg(point.y()), "gray");
}

}
void CVWidget::mouseReleaseEvent(QMouseEvent * mouseEvent)
{

if( form == 'a')
{
    this->setCursor(Qt::ArrowCursor);
    if(startSelection && _analyzerForm->radioBSelectionBoxIsSelected())
    {
        contr->addSelection(corner1.x(),corner1.y(),
                           corner2.x(),corner2.y());
        startSelection=false;
    }
    if (startRadius && _analyzerForm->radioBRadiusIsSelected())
    {
        contr->setCurrentMSDPatchRadius(corner1.x(), corner1.y(),
            corner2.x(), corner2.y());
        startRadius = false;
    }
    if (startSearchArea && _analyzerForm->radioBSearchAreaIsSelected())
    {
        contr->setCurrentMSDSearchArea(corner1.x(), corner1.y(),
            corner2.x(), corner2.y());
        startSearchArea = false;
    }
}
else if(form == 't')
{
    this->setCursor(Qt::CrossCursor);
    QPoint posWidg = this->pos();
    QPoint point = QPoint(mouseEvent->localPos().toPoint().x()-(posWidg.x()),
                       mouseEvent->localPos().toPoint().y());
    _trainerForm->showStatusBarMessage(QString("Mouse clicked (%1,%2)").arg(point.x()).arg(point.y()), "gray");
    contr->changeLabel2KP(point);
    contr->setCurrentImgToShow(contr->getCurrentImageWithKP());
    showImage(contr->getCurrentImgToShow());
}

}
void CVWidget::paintEvent(QPaintEvent * )
{

int w = orig_image.width();
int h = orig_image.height();
if( w <= 0 || h <= 0)
    return;
QImage::Format f = orig_image.toImage().format();
QImage image (w,h,f);
QPainter painter(&image);
if(startSelection)
{
    painter.setPen(QPen(Qt::red, 2));
}
else if (startRadius)
{
    painter.setPen(QPen(Qt::cyan, 2));
}
else if (startSearchArea)
{
    painter.setPen(QPen(Qt::magenta, 2));
}

QRectF rectangle(corner1,corner2);
painter.drawPixmap(0,0,orig_image);
painter.drawRect(rectangle);
painter.end();
m_imageLabel->setPixmap(QPixmap::fromImage(image));

}

The AnalyzerForm is the QWidget opened in a QMainWindow, and on it I have the problem.

AnalyzerForm::AnalyzerForm(QWidget *parent) :

QWidget(parent),
ui(new Ui::AnalyzerForm),
controller(new ControllerQt()),
fileSystemModel(new QFileSystemModel())

{

ui->setupUi(this);
fileSystemModel->setRootPath(PATH);
ui->treeViewFileSystem->setModel(fileSystemModel);
ui->treeViewFileSystem->setRootIndex(fileSystemModel->index(PATH));
ui->myCVWidget->setAnalyzerForm(this);
ui->myCVWidget->setController(controller);
ui->radioBSelectionBox->setChecked(true);

//selection trigger a slot
QItemSelectionModel * selectionModel = ui->treeViewFileSystem->selectionModel();
connect(selectionModel, SIGNAL(selectionChanged (const QItemSelection &, const QItemSelection &)),
         this, SLOT(selectionChangedSlot(const QItemSelection &, const QItemSelection &)));

}

AnalyzerForm::~AnalyzerForm()
{

delete ui;
delete controller;

}

void AnalyzerForm::setStatusBar(QStatusBar * statusBar)
{

_statusBar = statusBar;
}

void AnalyzerForm::showStatusBarMessage(QString message, QString color)
{

_statusBar->showMessage(message);
_statusBar->setStyleSheet(QString("QLabel { background-color : %1; color : black; }")
    .arg(color));

}

bool AnalyzerForm::radioBRadiusIsSelected()
{

return ui->radioBPatchRadius->isChecked();
}
bool AnalyzerForm::radioBSearchAreaIsSelected()
{

return ui->radioBSearchArea->isChecked();
}

bool AnalyzerForm::radioBSelectionBoxIsSelected()
{

return ui->radioBSelectionBox->isChecked();
}

void AnalyzerForm::on_buttonOpenImg_clicked()
{

if(!selectedFile.isEmpty())
{
    //set current image showed
    controller->openCurrentImage(selectedFile.toStdString());
    QImage imageShowed = controller->getCurrentImage();
    if(imageShowed.isNull())
    {
        QMessageBox::information(this,"Image Viewer","Error Displaying image");
        return;
    }
    ui->myCVWidget->showImage(imageShowed);
    ui->radioBPatchRadius->setEnabled(true);
    ui->radioBSearchArea->setEnabled(true);
}
return;

}

void AnalyzerForm::selectionChangedSlot(const QItemSelection & , const QItemSelection & )
{

//get the text of the selected item
const QModelIndex index = ui->treeViewFileSystem->selectionModel()->currentIndex();
selectedFile = fileSystemModel->filePath(index);
return;

}

void AnalyzerForm::on_buttonSave_clicked()
{

controller->saveSelections();

}

void AnalyzerForm::on_buttonSavePatternParams_clicked()
{

 QString filename = QFileDialog::getSaveFileName(this->parentWidget(), tr("Save file"), "./"+selectedFile, tr("_pp.yml"));
filename = filename + "_pp.yml";
controller->savePatternParams(filename.toStdString());

}

void AnalyzerForm::on_buttonDetectKpAll_clicked()
{

controller->detectAll();
ui->myCVWidget->showImage(controller->getCurrentImageWithKP());
showStatusBarMessage(QString("Detected: keyPoints. "), QString("green"));

}

void AnalyzerForm::on_buttonDetectKpCurrent_clicked()
{

controller->detectCurrent();
ui->myCVWidget->showImage(controller->getCurrentImageWithKP());
showStatusBarMessage(QString("Detected: keyPoints. Radius %1 SearchArea %2 Th. Saliency AVG %3")
    .arg(controller->getCurrentMsdPatchRadius())
    .arg(controller->getCurrentMsdSearchAreaRadius())
    .arg(controller->getCurrentMsdThSaliency()),
    QString("green"));

}

void AnalyzerForm::keyPressEvent(QKeyEvent * event)
{

if (event->key() == Qt::Key_C)
{
    ui->radioBPatchRadius->setEnabled(true);
    ui->radioBSearchArea->setEnabled(true);
    controller->setCurrentImgToShow(controller->getCurrentImage());
    ui->myCVWidget->showImage(controller->getCurrentImgToShow());
    showStatusBarMessage(QString("Original Image."), QString("white"));
}
if (event->key() == Qt::Key_A && radioBRadiusIsSelected())
{
    ui->radioBPatchRadius->setEnabled(false);
    controller->setCurrentImgToShow(ui->myCVWidget->getCurrentImageShowed());
    ui->myCVWidget->showImage(controller->getCurrentImgToShow());
    showStatusBarMessage(QString("Current MSD Radius saved."), QString("yellow"));
}
if (event->key() == Qt::Key_A && radioBSearchAreaIsSelected())
{
    ui->radioBSearchArea->setEnabled(false);
    controller->setCurrentImgToShow(ui->myCVWidget->getCurrentImageShowed());
    ui->myCVWidget->showImage(controller->getCurrentImgToShow());
    showStatusBarMessage(QString("Current MSD Search Area saved."), QString("yellow"));
}
if (event->key() == Qt::Key_A && radioBSelectionBoxIsSelected())
{
    controller->setCurrentImgToShow(ui->myCVWidget->getCurrentImageShowed());
    ui->myCVWidget->showImage(controller->getCurrentImgToShow());
    showStatusBarMessage(QString("Selection Box added."), QString("yellow"));
}
if (event->key() == Qt::Key_S )
{
    controller->addMsdParameters(controller->getCurrentMsdPatchRadius(),
                                 controller->getCurrentMsdSearchAreaRadius(),
                                 controller->getCurrentMsdThSaliency());
    showStatusBarMessage(QString("Current MSD Parameters added to list. Press the button to store it."), QString("green"));
}

}

I've the problem when I press the button OpenFile ( that call the function void AnalyzerForm::on_buttonOpenImg_clicked()) and then when I press the button Save Pattern Params ( the functions void AnalyzerForm::on_buttonSavePatternParams_clicked() ).
If I just press the button Save Pattern Params (so without opening any images )I don't have any problem. I think that there is an "interference" beteween the two QWidget.

Before the my application was structured with a QMainWindow with some buttons that will open a different QWidgets in different Window, for example the main window and then the "Analyzer Form" window, and everything was working.
Now I have a QMainWindow with a menuBar and with the function setCentralWidget I assign the different Qwidget. Reading the code of the QMainWindow maybe is more explanatory:
MainWindow::MainWindow(QWidget *parent) :

QMainWindow(parent),
ui(new Ui::MainWindow)

{

ui->setupUi(this);
//Default start with the AnalyzerForm
AnalyzerForm * form = new AnalyzerForm(this);
form->setStatusBar(ui->statusbar);
setCentralWidget(form);
setWindowTitle("SVM Classifier Application - Analyzer");
// adjustSize();

}

MainWindow::~MainWindow()
{

delete ui;

}

void MainWindow::closeEvent (QCloseEvent *){}

void MainWindow::on_actionOpen_triggered()
{

AnalyzerForm * form = new AnalyzerForm(this);
form->setStatusBar(ui->statusbar);
setCentralWidget(form);
setWindowTitle("SVM Classifier Application - Analyzer Msd Parameters");

// adjustSize();
}

void MainWindow::on_actionTrainer_triggered()
{

TrainerForm * form = new TrainerForm(this);
form->setStatusBar(ui->statusbar);
setCentralWidget(form);
setWindowTitle("SVM Classifier Application - Trainer");

// adjustSize();
}

void MainWindow::on_actionClassifier_triggered()
{

ClassifierForm * form = new ClassifierForm(this);
form->setStatusBar(ui->statusbar);
setCentralWidget(form);
setWindowTitle("SVM Classifier Application - Classifier");

// adjustSize();
}

void MainWindow::on_actionRoc_Curve_triggered()
{

PlotForm * form = new PlotForm(this);
setCentralWidget(form);
setWindowTitle("SVM Classifier Application - Curve Roc Analyzer");

}

Could be this different structure of the Qwidget and QMainWindow an other effect of my problem?

[annettaws]

Solved!!
The problem was the paintEvent on the Qwidget CVWidget always running when I open an image.
I suppose that it contrast the paintEvent of the QFileDialog with an incorrenct visualitazion.