Improve `window::Position` API

1 files changed, 44 insertions, 1 deletions

diff --git a/winit/src/conversion.rs b/winit/src/conversion.rs
index b850a805..f785fce6 100644
--- a/winit/src/conversion.rs
+++ b/winit/src/conversion.rs
@@ -6,7 +6,7 @@ use crate::keyboard;
 use crate::mouse;
 use crate::touch;
 use crate::window;
-use crate::{Event, Mode, Point};
+use crate::{Event, Mode, Point, Position};
 
 /// Converts a winit window event into an iced event.
 pub fn window_event(
@@ -133,6 +133,49 @@ pub fn window_event(
     }
 }
 
+/// Converts a [`Position`] to a [`winit`] logical position for a given monitor.
+///
+/// [`winit`]: https://github.com/rust-windowing/winit
+pub fn position(
+    monitor: Option<&winit::monitor::MonitorHandle>,
+    (width, height): (u32, u32),
+    position: Position,
+) -> Option<winit::dpi::Position> {
+    match position {
+        Position::Default => None,
+        Position::Specific(x, y) => {
+            Some(winit::dpi::Position::Logical(winit::dpi::LogicalPosition {
+                x: f64::from(x),
+                y: f64::from(y),
+            }))
+        }
+        Position::Centered => {
+            if let Some(monitor) = monitor {
+                let start = monitor.position();
+
+                let resolution: winit::dpi::LogicalSize<f64> =
+                    monitor.size().to_logical(monitor.scale_factor());
+
+                let centered: winit::dpi::PhysicalPosition<i32> =
+                    winit::dpi::LogicalPosition {
+                        x: (resolution.width - f64::from(width)) / 2.0,
+                        y: (resolution.height - f64::from(height)) / 2.0,
+                    }
+                    .to_physical(monitor.scale_factor());
+
+                Some(winit::dpi::Position::Physical(
+                    winit::dpi::PhysicalPosition {
+                        x: start.x + centered.x,
+                        y: start.y + centered.y,
+                    },
+                ))
+            } else {
+                None
+            }
+        }
+    }
+}
+
 /// Converts a [`Mode`] to a [`winit`] fullscreen mode.
 ///
 /// [`winit`]: https://github.com/rust-windowing/winit