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
use epaint::text::cursor::*;

/// A selected text range (could be a range of length zero).
#[derive(Clone, Copy, Debug, Default, PartialEq)]
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
pub struct CursorRange {
    /// When selecting with a mouse, this is where the mouse was released.
    /// When moving with e.g. shift+arrows, this is what moves.
    /// Note that the two ends can come in any order, and also be equal (no selection).
    pub primary: Cursor,

    /// When selecting with a mouse, this is where the mouse was first pressed.
    /// This part of the cursor does not move when shift is down.
    pub secondary: Cursor,
}

impl CursorRange {
    /// The empty range.
    pub fn one(cursor: Cursor) -> Self {
        Self {
            primary: cursor,
            secondary: cursor,
        }
    }

    pub fn two(min: Cursor, max: Cursor) -> Self {
        Self {
            primary: max,
            secondary: min,
        }
    }

    pub fn as_ccursor_range(&self) -> CCursorRange {
        CCursorRange {
            primary: self.primary.ccursor,
            secondary: self.secondary.ccursor,
        }
    }

    /// The range of selected character indices.
    pub fn as_sorted_char_range(&self) -> std::ops::Range<usize> {
        let [start, end] = self.sorted_cursors();
        std::ops::Range {
            start: start.ccursor.index,
            end: end.ccursor.index,
        }
    }

    /// True if the selected range contains no characters.
    pub fn is_empty(&self) -> bool {
        self.primary.ccursor == self.secondary.ccursor
    }

    /// If there is a selection, None is returned.
    /// If the two ends is the same, that is returned.
    pub fn single(&self) -> Option<Cursor> {
        if self.is_empty() {
            Some(self.primary)
        } else {
            None
        }
    }

    pub fn is_sorted(&self) -> bool {
        let p = self.primary.ccursor;
        let s = self.secondary.ccursor;
        (p.index, p.prefer_next_row) <= (s.index, s.prefer_next_row)
    }

    pub fn sorted(self) -> Self {
        if self.is_sorted() {
            self
        } else {
            Self {
                primary: self.secondary,
                secondary: self.primary,
            }
        }
    }

    /// returns the two ends ordered
    pub fn sorted_cursors(&self) -> [Cursor; 2] {
        if self.is_sorted() {
            [self.primary, self.secondary]
        } else {
            [self.secondary, self.primary]
        }
    }
}

/// A selected text range (could be a range of length zero).
///
/// The selection is based on character count (NOT byte count!).
#[derive(Clone, Copy, Debug, Default, PartialEq)]
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
pub struct CCursorRange {
    /// When selecting with a mouse, this is where the mouse was released.
    /// When moving with e.g. shift+arrows, this is what moves.
    /// Note that the two ends can come in any order, and also be equal (no selection).
    pub primary: CCursor,

    /// When selecting with a mouse, this is where the mouse was first pressed.
    /// This part of the cursor does not move when shift is down.
    pub secondary: CCursor,
}

impl CCursorRange {
    /// The empty range.
    pub fn one(ccursor: CCursor) -> Self {
        Self {
            primary: ccursor,
            secondary: ccursor,
        }
    }

    pub fn two(min: CCursor, max: CCursor) -> Self {
        Self {
            primary: max,
            secondary: min,
        }
    }

    pub fn is_sorted(&self) -> bool {
        let p = self.primary;
        let s = self.secondary;
        (p.index, p.prefer_next_row) <= (s.index, s.prefer_next_row)
    }

    /// returns the two ends ordered
    pub fn sorted(&self) -> [CCursor; 2] {
        if self.is_sorted() {
            [self.primary, self.secondary]
        } else {
            [self.secondary, self.primary]
        }
    }
}

#[derive(Clone, Copy, Debug, Default, PartialEq)]
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
pub struct PCursorRange {
    /// When selecting with a mouse, this is where the mouse was released.
    /// When moving with e.g. shift+arrows, this is what moves.
    /// Note that the two ends can come in any order, and also be equal (no selection).
    pub primary: PCursor,

    /// When selecting with a mouse, this is where the mouse was first pressed.
    /// This part of the cursor does not move when shift is down.
    pub secondary: PCursor,
}