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Refactor memory data (#836)

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This refactors the widget state storage introduced by @optozorax in https://github.com/emilk/egui/pull/257

* Unify the four buckets (`data`, `data_temp`, `id_data` and `id_data_temp`) into a single `data`.
  * Less complexity, and also less chance of error (storing in one bucket, reading from another).
* Store data by `Id` and `TypeId`.
  * Users can thus reuse the same `Id` to store many types.
  * Uses a simple xor of id and typeid, which is fast and good since both id and typeid are already high-entropy hashes.
* Use different suffixes on the functions to pick if you want the data persisted or not (`get_temp`, `insert_persisted`, etc).
  * Writing with one suffix and reading with the other works.
* To store state not bound to a specific `Id` (i.e. only based on type), use the new `Id::null` as the key.
This commit is contained in:
Emil Ernerfeldt
2021-10-27 08:51:34 +02:00
committed by GitHub
parent bbe0f6089c
commit 8e4fd942a9
31 changed files with 917 additions and 1347 deletions
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CHANGELOG.md
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@@ -10,6 +10,9 @@ NOTE: [`epaint`](epaint/CHANGELOG.md), [`eframe`](eframe/CHANGELOG.md), [`egui_w
### Added ⭐
* Add context menus: See `Ui::menu_button` and `Response::context_menu` ([#543](https://github.com/emilk/egui/pull/543)).
### Changed 🔧
* Unified the four `Memory` data buckts (`data`, `data_temp`, `id_data` and `id_data_temp`) into a single `Memory::data`, with a new interface ([#836](https://github.com/emilk/egui/pull/836)).
## 0.15.0 - 2021-10-24 - Syntax highlighting and hscroll