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Mårten Björk
35b9cbf27a
Adds `eframe::Frame::set_traffic_lights_position` for placing the native
macOS "traffic lights" (close/minimize/maximize buttons) inside a custom
title bar, e.g. when using
`ViewportBuilder::with_fullsize_content_view`.
## New API
```rust
impl eframe::Frame {
/// Center the traffic lights vertically in `title_bar_y` (measured from the top of the window),
/// with the close button `left_margin` from the left edge. Both in egui points.
/// Call it every frame. Does nothing on other platforms.
pub fn set_traffic_lights_position(
&self,
egui_ctx: &egui::Context,
title_bar_y: egui::Rangef,
left_margin: f32,
);
}
```
Usage (from the `custom_window_frame` example):
```rust
frame.set_traffic_lights_position(
ui.ctx(),
title_bar_rect.y_range(),
title_bar_rect.left() + 12.0,
);
```
## Details
* The buttons keep AppKit's native spacing.
* The native title bar is resized to cover the buttons, so they stay
clickable in title bars taller than the default.
* Units are egui points; the zoom factor is applied internally.
* It is immediate mode: AppKit resets the button positions whenever it
re-lays out the window (e.g. on resize), so call it every frame.
* No-op in fullscreen (the traffic lights live in a separate window
there) and on non-macOS platforms.
## Other changes
* `custom_window_frame` example: on macOS, uses a full-size content view
with the native traffic lights centered in the custom title bar, instead
of drawing its own buttons.
* `emath::Rangef` now supports `Rangef * f32`, `f32 * Rangef`, and
`Rangef / f32`.
* `WindowChromeMetrics::traffic_lights_size.y` now measures the top
margin from the top of the title bar (previously it was taken from the
bottom in AppKit's non-flipped coordinates), so the reported height may
change.
## Testing
Ran `custom_window_frame` on macOS: traffic lights stay centered when
resizing and zooming (cmd +/-).
* [x] I have followed the instructions in the PR template
🤖 This PR was written with Codex and Claude Code; Marten remains
responsible for the change.
---------
Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>
Example how to show a custom window frame instead of the default OS window chrome decorations.
cargo run -p custom_window_frame
