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Update the multiple_viewports example to show how to use `Context::request_repaint_of()`.

Open hydra opened this issue 1 month ago • 2 comments

I struggled for over an hour to figure out how to force a refresh from either the main thread or a background thread to no avail. Ended up asking in the egui discord server and was pointed at request_repaint_of, but there's no usages of this method in the egui codebase, nor did the existing demo showcase this.

https://github.com/user-attachments/assets/0970a7a8-6787-47cf-9b57-8222087822a0

  • [x] I have followed the instructions in the PR template

hydra avatar Oct 30 '25 15:10 hydra

Preview is being built...

Preview will be available at https://egui-pr-preview.github.io/pr/7676-improve-deferred-viewport-example-1

View snapshot changes at kitdiff

github-actions[bot] avatar Oct 30 '25 15:10 github-actions[bot]

Today I encountered a bug (#7686) when using multiple viewports so I updated this PR so it highlights the current behavior with request_repaint (or request_repaint_of) and a background thread, and request_repaint_after and request_repaint_of on the main thread.

Thus IMHO regardless of when #7686 is fixed, there's value in merging this PR now so that a) people can discover how to repaint deferred viewports, and b) so that it can be used when testing newer versions of egui and to help prevent regressions.

hydra avatar Nov 06 '25 14:11 hydra