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Web: Fix incorrect scale when moving to screen with new DPI (#5631)

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* Closes https://github.com/emilk/egui/issues/5246

Tested on
* [x] Chromium
* [x] Firefox
* [x] Safari

On Chromium and Firefox we get one annoying frame with the wrong size,
which can mess up the layout of egui apps, but this PR is still a huge
improvement, and I don't want to spend more time on this right now.
This commit is contained in:
Emil Ernerfeldt
2025-01-23 12:11:29 +01:00
committed by GitHub
parent 304c6518e3
commit 6680e9c079
5 changed files with 212 additions and 89 deletions
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14
crates/eframe/src/web/app_runner.rs
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@@ -59,7 +59,7 @@ impl AppRunner {
egui_ctx.options_mut(|o| {
// On web by default egui follows the zoom factor of the browser,
// and lets the browser handle the zoom shortscuts.
// and lets the browser handle the zoom shortcuts.
// A user can still zoom egui separately by calling [`egui::Context::set_zoom_factor`].
o.zoom_with_keyboard = false;
o.zoom_factor = 1.0;
@@ -216,6 +216,18 @@ impl AppRunner {
let canvas_size = super::canvas_size_in_points(self.canvas(), self.egui_ctx());
let mut raw_input = self.input.new_frame(canvas_size);
if super::DEBUG_RESIZE {
log::info!(
"egui running at canvas size: {}x{}, DPR: {}, zoom_factor: {}. egui size: {}x{} points",
self.canvas().width(),
self.canvas().height(),
super::native_pixels_per_point(),
self.egui_ctx.zoom_factor(),
canvas_size.x,
canvas_size.y,
);
}
self.app.raw_input_hook(&self.egui_ctx, &mut raw_input);
let full_output = self.egui_ctx.run(raw_input, |egui_ctx| {