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Add safe area and document coordinate systems (#3890)

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Added `Window::safe_area`, which describes the area of the surface that
is unobstructed by notches, bezels etc. The drawing code in the examples
have been updated to draw a star inside the safe area, and the plain
background outside of it.

Also renamed `Window::inner_position` to `Window::surface_position`, and
changed it to from screen coordinates to window coordinates, to better
align how these coordinate systems work together.

Finally, added some SVG images and documentation to describe how all of
this works.

This is fully implemented on macOS and iOS, and partially on the web.

Co-authored-by: daxpedda <daxpedda@gmail.com>
This commit is contained in:
Mads Marquart 2024-11-21 17:37:03 +01:00 • committed by GitHub
parent d0c6c34eaa
commit dbcdb6f1b4
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GPG key ID: B5690EEEBB952194
30 changed files with 797 additions and 212 deletions
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48
src/platform_impl/apple/uikit/view.rs
View file

@ -6,11 +6,12 @@ use objc2::runtime::{NSObjectProtocol, ProtocolObject};
use objc2::{declare_class, msg_send, msg_send_id, mutability, sel, ClassType, DeclaredClass};
use objc2_foundation::{CGFloat, CGPoint, CGRect, MainThreadMarker, NSObject, NSSet, NSString};
use objc2_ui_kit::{
UICoordinateSpace, UIEvent, UIForceTouchCapability, UIGestureRecognizer,
UIGestureRecognizerDelegate, UIGestureRecognizerState, UIKeyInput, UIPanGestureRecognizer,
UIPinchGestureRecognizer, UIResponder, UIRotationGestureRecognizer, UITapGestureRecognizer,
UITextInputTraits, UITouch, UITouchPhase, UITouchType, UITraitEnvironment, UIView,
UIEvent, UIForceTouchCapability, UIGestureRecognizer, UIGestureRecognizerDelegate,
UIGestureRecognizerState, UIKeyInput, UIPanGestureRecognizer, UIPinchGestureRecognizer,
UIResponder, UIRotationGestureRecognizer, UITapGestureRecognizer, UITextInputTraits, UITouch,
UITouchPhase, UITouchType, UITraitEnvironment, UIView,
};
use tracing::debug;
use super::app_state::{self, EventWrapper};
use super::window::WinitUIWindow;
@ -72,26 +73,15 @@ declare_class!(
let mtm = MainThreadMarker::new().unwrap();
let _: () = unsafe { msg_send![super(self), layoutSubviews] };
let window = self.window().unwrap();
let window_bounds = window.bounds();
let screen = window.screen();
let screen_space = screen.coordinateSpace();
let screen_frame = self.convertRect_toCoordinateSpace(window_bounds, &screen_space);
let scale_factor = screen.scale();
let frame = self.frame();
let scale_factor = self.contentScaleFactor() as f64;
let size = crate::dpi::LogicalSize {
width: screen_frame.size.width as f64,
height: screen_frame.size.height as f64,
}
.to_physical(scale_factor as f64);
// If the app is started in landscape, the view frame and window bounds can be mismatched.
// The view frame will be in portrait and the window bounds in landscape. So apply the
// window bounds to the view frame to make it consistent.
let view_frame = self.frame();
if view_frame != window_bounds {
self.setFrame(window_bounds);
width: frame.size.width as f64,
height: frame.size.height as f64,
}
.to_physical(scale_factor);
let window = self.window().unwrap();
app_state::handle_nonuser_event(
mtm,
EventWrapper::StaticEvent(Event::WindowEvent {
@ -126,13 +116,10 @@ declare_class!(
"invalid scale_factor set on UIView",
);
let scale_factor = scale_factor as f64;
let bounds = self.bounds();
let screen = window.screen();
let screen_space = screen.coordinateSpace();
let screen_frame = self.convertRect_toCoordinateSpace(bounds, &screen_space);
let frame = self.frame();
let size = crate::dpi::LogicalSize {
width: screen_frame.size.width as f64,
height: screen_frame.size.height as f64,
width: frame.size.width as f64,
height: frame.size.height as f64,
};
let window_id = window.id();
app_state::handle_nonuser_events(
@ -153,6 +140,13 @@ declare_class!(
);
}
#[method(safeAreaInsetsDidChange)]
fn safe_area_changed(&self) {
debug!("safeAreaInsetsDidChange was called, requesting redraw");
// When the safe area changes we want to make sure to emit a redraw event
self.setNeedsDisplay();
}
#[method(touchesBegan:withEvent:)]
fn touches_began(&self, touches: &NSSet<UITouch>, _event: Option<&UIEvent>) {
self.handle_touches(touches)