Dasturlash II 15-hafta mavzu: qt muhitida multimediyali fayllar bilan ishlash

#include
#include
#include

2. 
   Keyin, tasvirga ishlov berishdan oldin, haqiqiy tasvirni ko`rsatuvchi ko`rsatkich sifatida xizmat qiluvchi, imageBuffer deb nomlangan o`zgaruvchini qo`shamiz. Keyin funksiyalarni ham qo`shamiz:
   

private:
Ui::MainWindow *ui;
QPixmap* imageBuffer;
public:
void resizeImage();
void paintEvent(QPaintEvent *event);
public slots:
void on_actionOpen_triggered();

3. 
   Endi, mainwindow.cpp ni ochamiz va sinf konstruktorida imageBuffer ga qiymat yuklaymiz:
   

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
imageBuffer = nullptr;
}

4. 
   Shundan so`ng, avvalroq yaratgan slot funksiyamizga quyidagi kodni kiritamiz:
   

void MainWindow::on_actionOpen_triggered()
{
QString fileName = QFileDialog::getOpenFileName(this, "Open
Image File", qApp->applicationDirPath(), "JPG (*.jpg *.jpeg);;PNG
(*.png)");
if (!fileName.isEmpty())
{
imageBuffer = new QPixmap(fileName);
resizeImage();
}
}

5. 
   Yuqoridagi kod asosan, fayl tanlash dialog oynasini hosil qiladi va tanlangan rasm fayli bilan, QPixmap ob’yektini hosil qiladi. Bularning barchasi bajarilib bo`linganidan so`ng, u quyida ko`rsatilgani kabi, resizeImage() funksiyasini chaqiradi:
   

void MainWindow::resizeImage()
{
if (imageBuffer != nullptr)
{
QSize size = ui->imageDisplay->size();
QPixmap pixmap = imageBuffer->scaled(size,
Qt::KeepAspectRatio);
// Adjust the position of the image to the center
QRect rect = ui->imageDisplay->rect();
rect.setX((this->size().width() - pixmap.width()) / 2);
rect.setY((this->size().height() - pixmap.height()) / 2);
QPainter painter;
painter.begin(this);
painter.drawPixmap(rect, pixmap,
ui->imageDisplay->rect());
painter.end();
}
}