Here are some question-based titles that fit your provided article: * How to Resize a QLabel with a QPixmap while Maintaining Aspect Ratio? * Preserving Aspect Ratio: Resizing a QLabel with a Dynamic

Resizing a QLabel with a QPixmap While Maintaining Aspect Ratio

When working with a QLabel containing a dynamic QPixmap, resizing the label to accommodate changing space availability while preserving the aspect ratio of the image can be a challenge. The following provides a comprehensive solution without the need for subclassing:

Sizing the QLabel

To allow for resizing, set an appropriate size policy for the label, such as Expanding or Minimum Expanding. This will ensure that the label automatically adjusts its size based on the available space.

Scaling the QPixmap

To scale the pixmap while maintaining its aspect ratio, you can use the following code:

QPixmap p; // Load the pixmap
// Get the dimensions of the label
int w = label->width();
int h = label->height();

// Scale the pixmap to fit the label's dimensions while preserving its aspect ratio
label->setPixmap(p.scaled(w, h, Qt::KeepAspectRatio));

Event Handling

Add the above scaling code in two places:

1. When the pixmap is updated: This ensures the scaled pixmap is displayed.
2. In the resizeEvent of the widget containing the label: This handles resizing the image when the widget is resized.

By following these steps, you can effectively resize a QLabel with a QPixmap while preserving the aspect ratio of the image, providing a flexible and convenient way to display dynamic images in your application.

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