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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162

//! Access the clipboard.

use std::any::Any;

use dnd::{DndDestinationRectangle, DndSurface};
use iced_core::{clipboard::DndSource, Vector};
use iced_futures::MaybeSend;
use window_clipboard::mime::{AllowedMimeTypes, AsMimeTypes};

use crate::{command, Command};

/// An action to be performed on the system.
pub enum DndAction<T> {
    /// Register a Dnd destination.
    RegisterDndDestination {
        /// The surface to register.
        surface: DndSurface,
        /// The rectangles to register.
        rectangles: Vec<DndDestinationRectangle>,
    },
    /// Start a Dnd operation.
    StartDnd {
        /// Whether the Dnd operation is internal.
        internal: bool,
        /// The source surface of the Dnd operation.
        source_surface: Option<DndSource>,
        /// The icon surface of the Dnd operation.
        icon_surface: Option<Box<dyn Any>>,
        /// The content of the Dnd operation.
        content: Box<dyn AsMimeTypes + Send + 'static>,
        /// The actions of the Dnd operation.
        actions: dnd::DndAction,
    },
    /// End a Dnd operation.
    EndDnd,
    /// Peek the current Dnd operation.
    PeekDnd(String, Box<dyn Fn(Option<(Vec<u8>, String)>) -> T>),
    /// Set the action of the Dnd operation.
    SetAction(dnd::DndAction),
}

impl<T> std::fmt::Debug for DndAction<T> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Self::RegisterDndDestination {
                surface,
                rectangles,
            } => f
                .debug_struct("RegisterDndDestination")
                .field("surface", surface)
                .field("rectangles", rectangles)
                .finish(),
            Self::StartDnd {
                internal,
                source_surface,
                icon_surface,
                content: _,
                actions,
            } => f
                .debug_struct("StartDnd")
                .field("internal", internal)
                .field("source_surface", source_surface)
                .field("icon_surface", icon_surface)
                .field("actions", actions)
                .finish(),
            Self::EndDnd => f.write_str("EndDnd"),
            Self::PeekDnd(mime, _) => {
                f.debug_struct("PeekDnd").field("mime", mime).finish()
            }
            Self::SetAction(a) => f.debug_tuple("SetAction").field(a).finish(),
        }
    }
}

impl<T> DndAction<T> {
    /// Maps the output of a [`DndAction`] using the provided closure.
    pub fn map<A>(
        self,
        f: impl Fn(T) -> A + 'static + MaybeSend + Sync,
    ) -> DndAction<A>
    where
        T: 'static,
    {
        match self {
            Self::PeekDnd(m, o) => {
                DndAction::PeekDnd(m, Box::new(move |d| f(o(d))))
            }
            Self::EndDnd => DndAction::EndDnd,
            Self::SetAction(a) => DndAction::SetAction(a),
            Self::StartDnd {
                internal,
                source_surface,
                icon_surface,
                content,
                actions,
            } => DndAction::StartDnd {
                internal,
                source_surface,
                icon_surface,
                content,
                actions,
            },
            Self::RegisterDndDestination {
                surface,
                rectangles,
            } => DndAction::RegisterDndDestination {
                surface,
                rectangles,
            },
        }
    }
}

/// Read the current contents of the Dnd operation.
pub fn peek_dnd<T: AllowedMimeTypes + Send + Sync + 'static, Message>(
    f: impl Fn(Option<T>) -> Message + 'static,
) -> Command<Message> {
    Command::single(command::Action::Dnd(DndAction::PeekDnd(
        T::allowed()
            .get(0)
            .map_or_else(|| String::new(), |s| s.to_string()),
        Box::new(move |d| f(d.and_then(|d| T::try_from(d).ok()))),
    )))
}

/// Register a Dnd destination.
pub fn register_dnd_destination<Message>(
    surface: DndSurface,
    rectangles: Vec<DndDestinationRectangle>,
) -> Command<Message> {
    Command::single(command::Action::Dnd(DndAction::RegisterDndDestination {
        surface,
        rectangles,
    }))
}

/// Start a Dnd operation.
pub fn start_dnd<Message>(
    internal: bool,
    source_surface: Option<DndSource>,
    icon_surface: Option<Box<dyn Any>>,
    content: Box<dyn AsMimeTypes + Send + 'static>,
    actions: dnd::DndAction,
) -> Command<Message> {
    Command::single(command::Action::Dnd(DndAction::StartDnd {
        internal,
        source_surface,
        icon_surface,
        content,
        actions,
    }))
}

/// End a Dnd operation.
pub fn end_dnd<Message>() -> Command<Message> {
    Command::single(command::Action::Dnd(DndAction::EndDnd))
}

/// Set the action of the Dnd operation.
pub fn set_action<Message>(a: dnd::DndAction) -> Command<Message> {
    Command::single(command::Action::Dnd(DndAction::SetAction(a)))
}