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https://github.com/storytold/filmcraft.git
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Brandon Thomas
29 lines
1.4 KiB
Rust
29 lines
1.4 KiB
Rust
//! The mouse position in screen pixels, for when the windowing layer has none.
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//!
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//! While files are dragged in from the OS file manager, winit on Windows delivers no cursor events
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//! (it only reports hovered and dropped files), so the UI cannot learn where a drop landed.
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//!
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//! This is the one non-media OS call in this crate: `crates/platform` is the only crate allowed
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//! `unsafe` (AGENTS.md §0.3, ADR 0001), so the single `GetCursorPos` call lives here rather than
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//! in the UI. It is read-only, has a safe `Option`-returning API, and every other platform (and a
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//! failed call) falls back to the last pointer position egui saw. Drop it once winit reports the
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//! pointer position during an OS drag-and-drop.
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/// The cursor's position on the virtual screen in physical pixels, or `None` where the OS cannot
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/// say or this platform's windowing layer already reports it during a drag.
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#[cfg(target_os = "windows")]
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#[allow(unsafe_code)]
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pub fn cursor_screen_position() -> Option<(i32, i32)> {
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use windows::Win32::Foundation::POINT;
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use windows::Win32::UI::WindowsAndMessaging::GetCursorPos;
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let mut p = POINT { x: 0, y: 0 };
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// SAFETY: `p` is a valid, writable POINT for the duration of the call.
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unsafe { GetCursorPos(&mut p) }.ok()?;
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Some((p.x, p.y))
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}
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#[cfg(not(target_os = "windows"))]
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pub fn cursor_screen_position() -> Option<(i32, i32)> {
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None
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}
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