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|
//! Access the clipboard.
use crate::core::clipboard::Kind;
use std::sync::Arc;
use winit::window::{Window, WindowId};
/// A buffer for short-term storage and transfer within and between
/// applications.
#[allow(missing_debug_implementations)]
pub struct Clipboard {
state: State,
}
enum State {
Connected {
clipboard: window_clipboard::Clipboard,
// Held until drop to satisfy the safety invariants of
// `window_clipboard::Clipboard`.
//
// Note that the field ordering is load-bearing.
#[allow(dead_code)]
window: Arc<Window>,
},
Unavailable,
}
impl Clipboard {
/// Creates a new [`Clipboard`] for the given window.
pub fn connect(window: Arc<Window>) -> Clipboard {
// SAFETY: The window handle will stay alive throughout the entire
// lifetime of the `window_clipboard::Clipboard` because we hold
// the `Arc<Window>` together with `State`, and enum variant fields
// get dropped in declaration order.
#[allow(unsafe_code)]
let clipboard =
unsafe { window_clipboard::Clipboard::connect(&window) };
let state = match clipboard {
Ok(clipboard) => State::Connected { clipboard, window },
Err(_) => State::Unavailable,
};
Clipboard { state }
}
/// Creates a new [`Clipboard`] that isn't associated with a window.
/// This clipboard will never contain a copied value.
pub fn unconnected() -> Clipboard {
Clipboard {
state: State::Unavailable,
}
}
/// Reads the current content of the [`Clipboard`] as text.
pub fn read(&self, kind: Kind) -> Option<String> {
match &self.state {
State::Connected { clipboard, .. } => match kind {
Kind::Standard => clipboard.read().ok(),
Kind::Primary => clipboard.read_primary().and_then(Result::ok),
},
State::Unavailable => None,
}
}
/// Writes the given text contents to the [`Clipboard`].
pub fn write(&mut self, kind: Kind, contents: String) {
match &mut self.state {
State::Connected { clipboard, .. } => {
let result = match kind {
Kind::Standard => clipboard.write(contents),
Kind::Primary => {
clipboard.write_primary(contents).unwrap_or(Ok(()))
}
};
match result {
Ok(()) => {}
Err(error) => {
log::warn!("error writing to clipboard: {error}");
}
}
}
State::Unavailable => {}
}
}
/// Returns the identifier of the window used to create the [`Clipboard`], if any.
pub fn window_id(&self) -> Option<WindowId> {
match &self.state {
State::Connected { window, .. } => Some(window.id()),
State::Unavailable => None,
}
}
}
impl crate::core::Clipboard for Clipboard {
fn read(&self, kind: Kind) -> Option<String> {
self.read(kind)
}
fn write(&mut self, kind: Kind, contents: String) {
self.write(kind, contents);
}
}
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