306 lines
11 KiB
Rust
306 lines
11 KiB
Rust
use anyhow::Context as _;
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use core_graphics::{
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event::{CGEvent, CGEventFlags, CGEventType, CGMouseButton, EventField, ScrollEventUnit},
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event_source::{CGEventSource, CGEventSourceStateID},
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geometry::{CGPoint, CGRect},
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};
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use foreign_types::ForeignType;
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use objc::{
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class, msg_send,
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runtime::{BOOL, NO, Object, Sel, YES},
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sel, sel_impl,
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};
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/// US layout key codes and what each key types.
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const KEYS: [(&str, u16, &str); 32] = [
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(",", 43, ","),
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("a", 0, "a"),
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("b", 11, "b"),
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("c", 8, "c"),
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("e", 14, "e"),
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("f", 3, "f"),
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("i", 34, "i"),
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("s", 1, "s"),
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("v", 9, "v"),
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("t", 17, "t"),
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("w", 13, "w"),
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("1", 18, "1"),
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("2", 19, "2"),
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("5", 23, "5"),
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("9", 25, "9"),
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("0", 29, "0"),
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("=", 24, "="),
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("minus", 27, "-"),
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("m", 46, "m"),
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("q", 12, "q"),
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("[", 33, "["),
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("space", 49, " "),
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("tab", 48, "\t"),
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("enter", 36, "\r"),
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("backspace", 51, "\u{7f}"),
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("escape", 53, "\u{1b}"),
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("up", 126, "\u{F700}"),
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("down", 125, "\u{F701}"),
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("left", 123, "\u{F702}"),
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("f1", 122, "\u{F704}"),
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("f5", 96, "\u{F708}"),
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("f6", 97, "\u{F709}"),
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];
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/// AppKit's `NSRange`.
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#[repr(C)]
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struct Range {
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location: u64,
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length: u64,
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}
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fn string(text: &str) -> *mut Object {
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let text = std::ffi::CString::new(text).expect("no NUL in key text");
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unsafe { msg_send![class!(NSString), stringWithUTF8String: text.as_ptr()] }
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}
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/// `mark` composes `text` as an input method does; `commit` types it.
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fn compose(call: &str, text: &str, number: u32) -> anyhow::Result<()> {
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let none = Range {
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location: i64::MAX as u64,
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length: 0,
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};
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unsafe {
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let app: *mut Object = msg_send![class!(NSApplication), sharedApplication];
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let window: *mut Object = msg_send![app, windowWithWindowNumber: i64::from(number)];
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anyhow::ensure!(!window.is_null(), "no window {number}");
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let client: *mut Object = msg_send![window, firstResponder];
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match call {
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"mark" => {
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let end = Range {
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location: text.encode_utf16().count() as u64,
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length: 0,
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};
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let _: () = msg_send![client, setMarkedText: string(text) selectedRange: end replacementRange: none];
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}
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"commit" => {
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let _: () = msg_send![client, insertText: string(text) replacementRange: none];
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}
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other => anyhow::bail!("no input method call {other}"),
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}
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}
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log::info!("shot: {call} {text:?}");
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Ok(())
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}
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unsafe extern "C" {
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fn CGEventSetLocation(event: *mut core_graphics::sys::CGEvent, location: CGPoint);
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}
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/// A gesture's steps: each one's name, point and click count.
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fn steps(gesture: &str, points: &[CGPoint]) -> anyhow::Result<Vec<(String, CGPoint, i64)>> {
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let step = |name: &str, at: CGPoint, clicks| (name.to_string(), at, clicks);
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let (at, to) = (points[0], points.get(1).copied());
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Ok(match gesture {
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"click" | "click2" | "click3" => (1..=gesture[5..].parse().unwrap_or(1))
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.flat_map(|clicks| [step("ldown", at, clicks), step("lup", at, clicks)])
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.collect(),
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"rclick" => vec![step("rdown", at, 1), step("rup", at, 1)],
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"mclick" => vec![step("mdown", at, 1), step("mup", at, 1)],
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"drag" => {
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let to = to.context("drag needs a second point")?;
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vec![
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step("ldown", at, 1),
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step("ldrag", to, 1),
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step("lup", to, 1),
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]
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}
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name => vec![step(name, at, 1)],
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})
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}
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/// A step's event type, button and the selector gpui's view takes it by.
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fn kind(step: &str) -> anyhow::Result<(CGEventType, CGMouseButton, &'static str)> {
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Ok(match step {
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"ldown" => (
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CGEventType::LeftMouseDown,
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CGMouseButton::Left,
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"mouseDown:",
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),
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"lup" => (CGEventType::LeftMouseUp, CGMouseButton::Left, "mouseUp:"),
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"ldrag" => (
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CGEventType::LeftMouseDragged,
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CGMouseButton::Left,
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"mouseDragged:",
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),
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"rdown" => (
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CGEventType::RightMouseDown,
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CGMouseButton::Right,
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"rightMouseDown:",
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),
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"rup" => (
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CGEventType::RightMouseUp,
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CGMouseButton::Right,
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"rightMouseUp:",
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),
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"mdown" => (
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CGEventType::OtherMouseDown,
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CGMouseButton::Center,
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"otherMouseDown:",
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),
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"mup" => (
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CGEventType::OtherMouseUp,
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CGMouseButton::Center,
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"otherMouseUp:",
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),
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"move" => (CGEventType::MouseMoved, CGMouseButton::Left, "mouseMoved:"),
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other => anyhow::bail!("no mouse gesture {other}"),
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})
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}
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/// Hands gpui's view a mouse gesture as AppKit events, even while the window is inactive.
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fn mouse(name: &str, flags: u64, number: u32) -> anyhow::Result<()> {
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let mut fields = name.split('@');
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let gesture = fields.next().context("a gesture")?;
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let numbers: Vec<f64> = fields
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.flat_map(|field| field.split(','))
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.map(str::parse)
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.collect::<Result<_, _>>()
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.with_context(|| format!("numbers in {name}"))?;
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anyhow::ensure!(numbers.len() >= 2, "{name} needs a point");
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unsafe {
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let app: *mut Object = msg_send![class!(NSApplication), sharedApplication];
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let window: *mut Object = msg_send![app, windowWithWindowNumber: i64::from(number)];
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anyhow::ensure!(!window.is_null(), "no window {number}");
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let view: *mut Object = msg_send![window, firstResponder];
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let content: *mut Object = msg_send![window, contentView];
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let frame: CGRect = msg_send![content, frame];
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let height = frame.size.height;
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let points: Vec<CGPoint> = numbers
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.chunks_exact(2)
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.map(|pair| CGPoint::new(pair[0], height - pair[1]))
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.collect();
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let screens: *mut Object = msg_send![class!(NSScreen), screens];
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let main: *mut Object = msg_send![screens, objectAtIndex: 0u64];
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let screen: CGRect = msg_send![main, frame];
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let source = || {
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CGEventSource::new(CGEventSourceStateID::Private)
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.map_err(|_| anyhow::anyhow!("no event source"))
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};
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let deliver = |event: CGEvent, at: CGPoint, selector: &str| -> anyhow::Result<()> {
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CGEventSetLocation(
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event.as_ptr(),
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CGPoint::new(at.x, screen.size.height - at.y),
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);
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event.set_flags(CGEventFlags::from_bits_truncate(flags));
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let native: *mut Object = msg_send![class!(NSEvent), eventWithCGEvent: event.as_ptr()];
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anyhow::ensure!(!native.is_null(), "AppKit refused {name}");
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let selector = Sel::register(selector);
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let _: *mut Object = msg_send![view, performSelector: selector withObject: native];
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Ok(())
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};
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if let Some(up) = gesture.strip_prefix("scroll") {
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let lines = *numbers.get(2).context("a scroll needs lines")? as i32;
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let lines = if up == "up" { lines } else { -lines };
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let event = CGEvent::new_scroll_event(source()?, ScrollEventUnit::LINE, 1, lines, 0, 0)
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.map_err(|_| anyhow::anyhow!("no scroll event"))?;
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deliver(event, points[0], "scrollWheel:")?;
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} else {
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for (step, at, clicks) in steps(gesture, &points)? {
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let (kind, button, selector) = kind(&step)?;
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let event = CGEvent::new_mouse_event(source()?, kind, at, button)
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.map_err(|_| anyhow::anyhow!("no mouse event"))?;
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event.set_integer_value_field(EventField::MOUSE_EVENT_CLICK_STATE, clicks);
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deliver(event, at, selector)?;
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}
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}
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}
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log::info!("shot: mouse {name}");
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Ok(())
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}
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/// Posts `spec`, a key, an input method call or a mouse gesture, on window `number`.
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pub fn post(spec: &str, number: u32) -> anyhow::Result<()> {
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if let Some((call, text)) = spec.split_once(':') {
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return compose(call, text, number);
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}
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if let "activate" | "deactivate" = spec {
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unsafe {
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let app: *mut Object = msg_send![class!(NSApplication), sharedApplication];
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if spec == "activate" {
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let _: () = msg_send![app, activateIgnoringOtherApps: YES];
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} else {
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let _: () = msg_send![app, deactivate];
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}
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}
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log::info!("shot: {spec}");
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return Ok(());
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}
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let mut parts: Vec<&str> = spec.split('-').collect();
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let name = parts.pop().context("an empty key")?;
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let mut flags: u64 = 0;
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let mut repeat = NO;
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for modifier in &parts {
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flags |= match *modifier {
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"repeat" => {
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repeat = YES;
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0
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}
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"shift" => 0x20000 | 0x02,
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"ctrl" => 0x40000 | 0x01,
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"lopt" => 0x80000 | 0x20,
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"ropt" => 0x80000 | 0x40,
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"cmd" => 0x100000 | 0x08,
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other => anyhow::bail!("no modifier {other}"),
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};
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}
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if name.contains('@') {
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return mouse(name, flags, number);
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}
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let (_, code, plain) = KEYS
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.iter()
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.find(|(key, ..)| *key == name)
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.with_context(|| format!("no key code for {name}"))?;
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if plain
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.chars()
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.next()
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.is_some_and(|ch| ('\u{F700}'..='\u{F8FF}').contains(&ch))
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{
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flags |= 0x800000 | 0x200000;
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}
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let ignoring = if flags & 0x20000 != 0 {
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plain.to_uppercase()
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} else {
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plain.to_string()
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};
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let typed = match plain.chars().next() {
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_ if flags & 0x80000 != 0 => String::new(),
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Some(letter @ 'a'..='z') if flags & 0x40000 != 0 => {
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char::from(letter as u8 - b'a' + 1).to_string()
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}
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_ => ignoring.clone(),
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};
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for kind in [10u64, 11] {
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unsafe {
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let event: *mut Object = msg_send![
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class!(NSEvent),
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keyEventWithType: kind
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location: CGPoint::new(0.0, 0.0)
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modifierFlags: flags
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timestamp: 0.0f64
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windowNumber: i64::from(number)
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context: std::ptr::null_mut::<Object>()
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characters: string(&typed)
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charactersIgnoringModifiers: string(&ignoring)
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isARepeat: if kind == 10 { repeat } else { NO }
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keyCode: *code
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];
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anyhow::ensure!(!event.is_null(), "AppKit refused the key {spec}");
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let app: *mut Object = msg_send![class!(NSApplication), sharedApplication];
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let _: () = msg_send![app, postEvent: event atStart: NO];
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}
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}
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let active: BOOL = unsafe {
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let app: *mut Object = msg_send![class!(NSApplication), sharedApplication];
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msg_send![app, isActive]
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};
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let state = if active == YES { "active" } else { "inactive" };
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log::info!("shot: typed {spec}, the app {state}");
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Ok(())
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}
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