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[refactor] remove Ui::canvas (use Ui::allocate_space instead)

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Emil Ernerfeldt
2020-10-10 12:24:45 +02:00
parent b01690c7b8
commit 343648b94c
3 changed files with 4 additions and 22 deletions
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@@ -122,16 +122,6 @@ TODO-list for the Egui project. If you looking for something to do, look here.
* e.g. `ui.wrap(Frame::new()).wrap(Resize::new()).wrap(ScrollArea::new()).show(|ui| ...)`
* [ ] Attach labels to checkboxes, radio buttons and sliders with a separate wrapper-widget ?
### Refactor space allocation
When painting a widget, you want to allocate space. On that space you sometimes want to paint, sometimes create a sub-Ui to layout child widgets. So sometimes you want a `Painter` for the region, sometimes a new `Ui`. However, what you are doing is essentially the same thing, and so we should make that clearer somehow, maybe via naming.
* `ui.allocate(size) -> Rect`
* `ui.canvas(size) -> Paint`
* `ui.child_ui(size) -> Ui`
This is a good place to support whole-widget culling. If a swidget is not visible, the above functions should maybe return `None` so that the widget code can early-out.
## Other
* [x] Persist UI state in external storage