Add Snippet 386: Demonstrates Cursor constructors and DPI scaling in SWT

[ShahzaibIbrahim]

This snippet demonstrates several ways to construct and use cursors in an SWT application, including system cursors, custom image cursors, and DPI-aware cursors using ImageDataProvider. The user interface allows interactive selection of the cursor construction method, and updates the shell’s cursor in real time based on the current choice. The snippet displays the current system zoom level (DPI) and the expected cursor size, and draws reference ticks to help visualize scaling effects. It also responds to system DPI changes, ensuring accurate display and behavior at different zoom levels. The code is structured for clarity and modularity, making it suitable for direct use with the SWT Snippet Explorer.

Preview

[github-actions]

Test Results

   546 files  ±0     546 suites  ±0   41m 39s ⏱️ + 9m 23s
 4 431 tests ±0   4 410 ✅  - 4   17 💤 ±0  4 ❌ +4 
16 764 runs  ±0  16 633 ✅  - 4  127 💤 ±0  4 ❌ +4 

For more details on these failures, see this check.

Results for commit 2445626. ± Comparison against base commit 508ad4a.

♻️ This comment has been updated with latest results.

[HeikoKlare]

In general the snippet looks good and is really helpful for testing. I have few comments on potentialy flaws and OS-specifics, and some more rather nitpicky ones on code style.

[ShahzaibIbrahim]

@HeikoKlare I have addressed all the comments, also made some UI improvements and it is now ready for review.

[HeikoKlare]

I think the for a snippet the code is okay now. Please auto-format the code as it does currently not conform to the auto-formatting settings. I have some minor proposals for improvement, which you could also apply with the formatting.

As the snippet perfectly shows the wrong cursor size when using the (Device, ImageData, ImageData, int, int) constructor: do we already have a ticket for analyzing/improving that?

[ShahzaibIbrahim]

As the snippet perfectly shows the wrong cursor size when using the (Device, ImageData, ImageData, int, int) constructor: do we already have a ticket for analyzing/improving that?

I already have a ticket for that. See, vi-eclipse/Eclipse-Platform#441