Can Qt Interrupted File Operations Enhance User Interaction?

Interrupting File Operations: Unlocking User Interaction

Question:
When dealing with massive files, users may need to cancel lengthy copy or rename operations. Qt's inherent mechanisms seem to lack this ability, creating frustration as users patiently wait for multi-gigabyte file transfers. Are there alternative approaches to enabling interruption of these file operations?

Answer:

Copy Operation:

• Qt does not provide a built-in solution for interrupting copy operations.

• Custom implementation is required:

  • Utilize a fragmented copy approach, reading chunks of the file into a buffer.
  • Continuously poll for cancellation to process user events.
• Implement a dedicated copy helper class that tracks progress, file size, and handles cancellation.

Rename Operation:

• Qt also lacks interrupt capabilities for rename operations.
• Custom implementation is necessary to replicate the copy operation approach or employ a lightweight alternative.

Example Helper Class (Copy Operation):

class CopyHelper : public QObject {
    // Implementation goes here
};

This copy helper class allows for progress tracking, pausing, and interruption of file copy operations. You can extend it to support rename operations as well.

Benefits of Interruption:

• Improved user experience by enabling cancellation of lengthy file operations.
• Responsiveness of the application, as the event loop is not locked during copy/rename actions.
• Increased flexibility for users to correct mistakes or respond to system changes.

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