cacao 0.3.2

Rust bindings for AppKit (macOS/Airyx/GNUStep, beta) and UIKit (iOS/tvOS, alpha).
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64

//! Wraps `CALayer` across all platforms.
//!
//! Each widget has an underlying `layer` field that you can access, which offers additional
//! rendering tools.
//!
//! ```rust,no_run
//! // Create a rounded red box
//! use cacao::view::View;
//! use cacao::color::Color;
//! let view = View::default();
//! view.set_background_color(Color::SystemRed);
//! view.layer.set_corner_radius(4.0);
//! ```

use core_graphics::base::CGFloat;

use objc::{class, msg_send, sel, sel_impl};

use crate::foundation::id;
use crate::utils::properties::ObjcProperty;

/// Represents a `CALayer`.
///
/// Each widget has an underlying `layer` field that you can access, which offers additional
/// rendering tools.
///
/// ```rust,no_run
/// // Create a rounded red box
/// use cacao::view::View;
/// use cacao::color::Color;
/// let view = View::default();
/// view.set_background_color(Color::SystemRed);
/// view.layer.set_corner_radius(4.0);
/// ```
#[derive(Clone, Debug)]
pub struct Layer {
    /// The underlying layer pointer.
    pub objc: ObjcProperty
}

impl Layer {
    /// Creates a new `CALayer` and retains it.
    pub fn new() -> Self {
        Layer {
            objc: ObjcProperty::retain(unsafe { msg_send![class!(CALayer), new] })
        }
    }

    /// Wraps an existing (already retained) `CALayer`.
    pub fn wrap(layer: id) -> Self {
        Layer {
            objc: ObjcProperty::from_retained(layer)
        }
    }

    /// Sets the corner radius (for all four corners).
    ///
    /// Note that for performance sensitive contexts, you might want to apply a mask instead.
    pub fn set_corner_radius(&self, radius: f64) {
        self.objc.with_mut(|obj| unsafe {
            let _: () = msg_send![obj, setCornerRadius: radius as CGFloat];
        });
    }
}