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
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131

//! Handles querying data from the renderer

use euclid::Rect;

use std::{
    any::Any,
    fmt::{Display, Formatter},
    future::Future,
    pin::Pin,
    rc::Rc,
};

/// An Element that has been rendered and allows reading and modifying information about it.
///
/// Different platforms will have different implementations and different levels of support for this trait. Renderers that do not support specific features will return `None` for those queries.
// we can not use async_trait here because it does not create a trait that is object safe
pub trait RenderedElementBacking {
    /// Get the renderer specific element for the given id
    fn get_raw_element(&self) -> MountedResult<&dyn Any> {
        Err(MountedError::NotSupported)
    }

    /// Get the bounding rectangle of the element relative to the viewport (this does not include the scroll position)
    #[allow(clippy::type_complexity)]
    fn get_client_rect(&self) -> Pin<Box<dyn Future<Output = MountedResult<Rect<f64, f64>>>>> {
        Box::pin(async { Err(MountedError::NotSupported) })
    }

    /// Scroll to make the element visible
    fn scroll_to(
        &self,
        _behavior: ScrollBehavior,
    ) -> Pin<Box<dyn Future<Output = MountedResult<()>>>> {
        Box::pin(async { Err(MountedError::NotSupported) })
    }

    /// Set the focus on the element
    fn set_focus(&self, _focus: bool) -> Pin<Box<dyn Future<Output = MountedResult<()>>>> {
        Box::pin(async { Err(MountedError::NotSupported) })
    }
}

impl RenderedElementBacking for () {}

/// The way that scrolling should be performed
#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
pub enum ScrollBehavior {
    /// Scroll to the element immediately
    #[cfg_attr(feature = "serialize", serde(rename = "instant"))]
    Instant,
    /// Scroll to the element smoothly
    #[cfg_attr(feature = "serialize", serde(rename = "smooth"))]
    Smooth,
}

/// An Element that has been rendered and allows reading and modifying information about it.
///
/// Different platforms will have different implementations and different levels of support for this trait. Renderers that do not support specific features will return `None` for those queries.
pub struct MountedData {
    inner: Rc<dyn RenderedElementBacking>,
}

impl MountedData {
    /// Create a new MountedData
    pub fn new(registry: impl RenderedElementBacking + 'static) -> Self {
        Self {
            inner: Rc::new(registry),
        }
    }

    /// Get the renderer specific element for the given id
    pub fn get_raw_element(&self) -> MountedResult<&dyn Any> {
        self.inner.get_raw_element()
    }

    /// Get the bounding rectangle of the element relative to the viewport (this does not include the scroll position)
    pub async fn get_client_rect(&self) -> MountedResult<Rect<f64, f64>> {
        self.inner.get_client_rect().await
    }

    /// Scroll to make the element visible
    pub fn scroll_to(
        &self,
        behavior: ScrollBehavior,
    ) -> Pin<Box<dyn Future<Output = MountedResult<()>>>> {
        self.inner.scroll_to(behavior)
    }

    /// Set the focus on the element
    pub fn set_focus(&self, focus: bool) -> Pin<Box<dyn Future<Output = MountedResult<()>>>> {
        self.inner.set_focus(focus)
    }
}

use dioxus_core::Event;

pub type MountedEvent = Event<MountedData>;

impl_event! [
    MountedData;

    /// mounted
    onmounted
];

/// The MountedResult type for the MountedData
pub type MountedResult<T> = Result<T, MountedError>;

#[derive(Debug)]
/// The error type for the MountedData
pub enum MountedError {
    /// The renderer does not support the requested operation
    NotSupported,
    /// The element was not found
    OperationFailed(Box<dyn std::error::Error>),
}

impl Display for MountedError {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        match self {
            MountedError::NotSupported => {
                write!(f, "The renderer does not support the requested operation")
            }
            MountedError::OperationFailed(e) => {
                write!(f, "The operation failed: {}", e)
            }
        }
    }
}

impl std::error::Error for MountedError {}