egui menus: remember size from previous frame #3974
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emilk
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### What Show `Color` instead of `rerun.components.Color`  The width is unnecessarily wide, but thats's something that I will punt on for now (requires some menu memory in egui: emilk/egui#3974). ### Checklist * [x] I have read and agree to [Contributor Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and the [Code of Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md) * [x] I've included a screenshot or gif (if applicable) * [x] I have tested the web demo (if applicable): * Using newly built examples: [app.rerun.io](https://app.rerun.io/pr/5037/index.html) * Using examples from latest `main` build: [app.rerun.io](https://app.rerun.io/pr/5037/index.html?manifest_url=https://app.rerun.io/version/main/examples_manifest.json) * Using full set of examples from `nightly` build: [app.rerun.io](https://app.rerun.io/pr/5037/index.html?manifest_url=https://app.rerun.io/version/nightly/examples_manifest.json) * [x] The PR title and labels are set such as to maximize their usefulness for the next release's CHANGELOG - [PR Build Summary](https://build.rerun.io/pr/5037) - [Docs preview](https://rerun.io/preview/2b2b8ad07179a57b58610587568973a0a9aacab4/docs) <!--DOCS-PREVIEW--> - [Examples preview](https://rerun.io/preview/2b2b8ad07179a57b58610587568973a0a9aacab4/examples) <!--EXAMPLES-PREVIEW--> - [Recent benchmark results](https://build.rerun.io/graphs/crates.html) - [Wasm size tracking](https://build.rerun.io/graphs/sizes.html)
This was referenced May 6, 2024
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emilk
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May 29, 2024
…enus in particular (#4557) * Part of #4535 * Closes #3974 This adds a special `sizing_pass` mode to `Ui`, in which we have no centered or justified layouts, and everything is hidden. This is used by `Area` to use the first frame to measure the size of its contents so that it can then set the perfectly correct size the subsequent frames. For menus, where buttons are justified (span the full width), this finally the problem of auto-sizing. Before you would have to pick a width manually, and all buttons would expand to that width. If it was too wide, it looked weird. If it was too narrow, text would wrap. Now all menus are exactly the width they need to be. By default menus will wrap at `Spacing::menu_width`. This affects all situations when you have something that should be as small as possible, but still span the full width/height of the parent. For instance: the `egui::Separator` widget now checks the `ui.is_sizing_pass` flag before deciding on a size. In the sizing pass a horizontal separator is always 0 wide, and only in subsequent passes will it span the full width.
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egui menus use a justified layout, so that buttons fill the full width.
This means we currently have to pick a width up front and then fit all buttons to that.
It would be nicer to be able to dynamically size the menu based on the contents in the first frame.
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