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Implement trackpad pinch-to-zoom for plots in egui_web (#333)

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This adds a new `zoom_delta` to input.
This is hooked up to ctrl-scroll on egui_web and egui_glium.

Browsers convert trackpad pinch gestures to ctrl-scroll,
so this means you can not pinch-to-zoom plots (on trackpad).

In the future we can support multitouch pinch-to-zoom via the same
`InputState::zoom_factor()` function
This commit is contained in:
Emil Ernerfeldt
2021-04-25 17:04:34 +02:00
committed by GitHub
parent 7f0689e566
commit c2744a1437
8 changed files with 72 additions and 29 deletions
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CHANGELOG.md
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@@ -13,6 +13,7 @@ NOTE: [`eframe`](eframe/CHANGELOG.md), [`egui_web`](egui_web/CHANGELOG.md) and [
* Add `Response::request_focus` and `Response::surrender_focus`.
* [Pan and zoom plots](https://github.com/emilk/egui/pull/317).
* [Users can now store custom state in `egui::Memory`.](https://github.com/emilk/egui/pull/257).
* Zoom input: ctrl-scroll and (on `egui_web`) trackpad-pinch gesture.
### Changed 🔧
* Make `Memory::has_focus` public (again).