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Thread: adjust QLabel according to the size of the window

  1. #1
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    Jan 2016
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    Default adjust QLabel according to the size of the window

    Hello,
    i have an image and i want to display it but i don't want to fix the size of a QLabel, i want the QPixmap to be adjusted automatically with the QLabel and the QLabel also be adjusted dynamically according to the size of the window, i.e i want the QLabel to resize itself according to the resize of my QMainWindow in such way the QPixmap is also adjusted with QLabel
    How can i do that please.
    ImageViewer.h
    Qt Code:
    1. #ifndef IMAGEVIEWER_H
    2. #define IMAGEVIEWER_H
    3. #include<QtWidgets>
    4.  
    5. class ImageViewer : public QMainWindow
    6. {
    7. Q_OBJECT
    8. public:
    9. ImageViewer();
    10. public slots:
    11. void ouvrir();
    12. private:
    13. QLabel *label;
    14. QImage *image;
    15. QVBoxLayout *layout;
    16. };
    17.  
    18. #endif // IMAGEVIEWER_H
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    imageViewer.cpp
    Qt Code:
    1. #include "imageviewer.h"
    2.  
    3. ImageViewer::ImageViewer(): QMainWindow()
    4. {
    5. label = new QLabel(this);
    6.  
    7. label->move(100,100);
    8. layout = new QVBoxLayout(this);
    9. layout->addWidget(label);
    10. this->setLayout(layout);
    11. QMenu *fichier = menuBar()->addMenu("Fichier");
    12. QMenu *edition = menuBar()->addMenu("Edition");
    13.  
    14. QAction *ouvrir = new QAction("Ouvrir",this);
    15. fichier->addAction(ouvrir);
    16. connect(ouvrir,SIGNAL(triggered(bool)),this,SLOT(ouvrir()));
    17.  
    18. }
    19.  
    20. void ImageViewer::ouvrir()
    21. {
    22. QString nomFichier = QFileDialog::getOpenFileName(this,"Open file", "C://");
    23.  
    24. QPixmap p(nomFichier);
    25. label->setPixmap(nomFichier);
    26.  
    27. }
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    thank you

  2. #2
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    Default Re: adjust QLabel according to the size of the window

    QMainWindow already has a layout, set your label as the window's centralWidget.

    If you want the label to scale its contents, set "scaledContents" to true.

    Cheers,
    _

  3. The following user says thank you to anda_skoa for this useful post:

    rafik (14th February 2016)

  4. #3
    Join Date
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    Default Re: adjust QLabel according to the size of the window

    Thank you Mr anda for your help, it resizes dynamically now when i expand the size, but when i want to resize into smaller size it didn't resize, are the any solutions if possible?
    ImageViewer.cpp
    Qt Code:
    1. #include "imageviewer.h"
    2.  
    3. ImageViewer::ImageViewer(): QMainWindow()
    4. {
    5. QWidget *centralArea = new QWidget(this);
    6. this->setCentralWidget(centralArea);
    7. label = new QLabel(this);
    8. bouton = new QPushButton("ok", this);
    9. layout = new QVBoxLayout(centralArea);
    10.  
    11. layout->addWidget(label);
    12. layout->addWidget(bouton);
    13. centralArea->setLayout(layout);
    14.  
    15.  
    16. QMenu *fichier = menuBar()->addMenu("Fichier");
    17. QMenu *edition = menuBar()->addMenu("Edition");
    18.  
    19. QAction *ouvrir = new QAction("Ouvrir",this);
    20. fichier->addAction(ouvrir);
    21. connect(ouvrir,SIGNAL(triggered(bool)),this,SLOT(ouvrir()));
    22.  
    23. }
    24.  
    25. void ImageViewer::ouvrir()
    26. {
    27. QString nomFichier = QFileDialog::getOpenFileName(this,"Open file", "C://");
    28.  
    29. QPixmap p(nomFichier);
    30. label->setPixmap(nomFichier);
    31. label->setScaledContents(true);
    32. }
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    Last edited by rafik; 14th February 2016 at 18:35.

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