Conditionally propagate web events using a filter in WebOptions #5056
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Currently egui will prevent all web events from propagating. This causes issues in contexts where you are using egui embedded in a larger context that wants to receive events that egui does not directly respond to. For example, currently using egui in a VSCode extension will block all app hotkeys, such as saving and opening the panel. This adds a closure to `WebConfig` that takes in a reference to the egui event that is generated from a web event and returns if the corresponding web event should be propagated or not. The default for it is to always return false. Alternatives I considered were: 1) Having the propagation filter be a property of the focus in memory. That way it could be configured by the view currently selected. I opted away from that because I wanted to avoid lowering eframe implementation specific stuff into egui. 2) Having events contain a `web_propagate` flag that could be set when handling them. However, that would not be compatible with the current system of egui events being handled outside of the web event handler.
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emilk
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I updated the comments. I also added the same comments to other occurrences of the check for consistency. |
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…k#5056) Currently egui will prevent all web events from propagating. This causes issues in contexts where you are using egui in a larger web context that wants to receive events that egui does not directly respond to. For example, currently using egui in a VSCode extension will block all app hotkeys, such as saving and opening the panel. This adds a closure to `WebOptions` that takes in a reference to the egui event that is generated from a web event and returns if the corresponding web event should be propagated or not. The default for it is to always return false. Alternatives I considered were: 1. Having the propagation filter be a property of the focus in memory. That way it could be configured by the view currently selected. I opted away from that because I wanted to avoid lowering eframe implementation specific stuff into egui. 2. Having events contain a `web_propagate` flag that could be set when handling them. However, that would not be compatible with the current system of egui events being handled outside of the web event handler. I just recently started using egui so I am not sure how idiomatic my approach here is. I would be happy to switch this over to a different architecture if there are suggestions. <!-- Please read the "Making a PR" section of [`CONTRIBUTING.md`](https://github.com/emilk/egui/blob/master/CONTRIBUTING.md) before opening a Pull Request! * Keep your PR:s small and focused. * The PR title is what ends up in the changelog, so make it descriptive! * If applicable, add a screenshot or gif. * If it is a non-trivial addition, consider adding a demo for it to `egui_demo_lib`, or a new example. * Do NOT open PR:s from your `master` branch, as that makes it hard for maintainers to test and add commits to your PR. * Remember to run `cargo fmt` and `cargo clippy`. * Open the PR as a draft until you have self-reviewed it and run `./scripts/check.sh`. * When you have addressed a PR comment, mark it as resolved. Please be patient! I will review your PR, but my time is limited! --> * [x] I have followed the instructions in the PR template
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Currently egui will prevent all web events from propagating. This causes issues in contexts where you are using egui in a larger web context that wants to receive events that egui does not directly respond to. For example, currently using egui in a VSCode extension will block all app hotkeys, such as saving and opening the panel.
This adds a closure to
WebOptionsthat takes in a reference to the egui event that is generated from a web event and returns if the corresponding web event should be propagated or not. The default for it is to always return false.Alternatives I considered were:
web_propagateflag that could be set when handling them. However, that would not be compatible with the current system of egui events being handled outside of the web event handler.I just recently started using egui so I am not sure how idiomatic my approach here is. I would be happy to switch this over to a different architecture if there are suggestions.