skia_safe/modules/paragraph/
dart_types.rs

1use crate::Rect;
2use skia_bindings as sb;
3use std::{
4    cmp::{max, min},
5    ops::Range,
6};
7
8pub use sb::skia_textlayout_Affinity as Affinity;
9variant_name!(Affinity::Downstream);
10
11#[repr(i32)]
12#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq, Default)]
13pub enum RectHeightStyle {
14    /// Provide tight bounding boxes that fit heights per run.
15    #[default]
16    Tight,
17    // The height of the boxes will be the maximum height of all runs in the
18    // line. All rects in the same line will be the same height.
19    Max,
20    // Extends the top and/or bottom edge of the bounds to fully cover any line
21    // spacing. The top edge of each line should be the same as the bottom edge
22    // of the line above. There should be no gaps in vertical coverage given any
23    // ParagraphStyle line_height.
24    //
25    // The top and bottom of each rect will cover half of the
26    // space above and half of the space below the line.
27    IncludeLineSpacingMiddle,
28    // The line spacing will be added to the top of the rect.
29    IncludeLineSpacingTop,
30    // The line spacing will be added to the bottom of the rect.
31    IncludeLineSpacingBottom,
32    Strut,
33}
34native_transmutable!(
35    sb::skia_textlayout_RectHeightStyle,
36    RectHeightStyle,
37    rect_height_style_layout
38);
39
40#[repr(i32)]
41#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq, Default)]
42pub enum RectWidthStyle {
43    /// Provide tight bounding boxes that fit widths to the runs of each line
44    /// independently.
45    #[default]
46    Tight,
47    /// Extends the width of the last rect of each line to match the position of
48    /// the widest rect over all the lines.
49    Max,
50}
51native_transmutable!(
52    sb::skia_textlayout_RectWidthStyle,
53    RectWidthStyle,
54    rect_width_style_layout
55);
56
57pub use sb::skia_textlayout_TextAlign as TextAlign;
58variant_name!(TextAlign::End);
59pub use sb::skia_textlayout_TextDirection as TextDirection;
60variant_name!(TextDirection::LTR);
61
62pub use sb::skia_textlayout_PositionWithAffinity as PositionWithAffinity;
63
64#[repr(C)]
65#[derive(Copy, Clone, PartialEq, Debug)]
66pub struct TextBox {
67    pub rect: Rect,
68    pub direct: TextDirection,
69}
70
71native_transmutable!(sb::skia_textlayout_TextBox, TextBox, text_box_layout);
72
73pub const EMPTY_INDEX: usize = usize::MAX;
74
75pub trait RangeExtensions {
76    fn width(&self) -> usize;
77    fn shift(&mut self, d: isize);
78    fn contains(&self, other: &Self) -> bool;
79    fn intersects(&self, other: &Self) -> bool;
80    #[must_use]
81    fn intersection(&self, other: &Self) -> Self;
82    fn empty(&self) -> bool;
83}
84
85impl RangeExtensions for Range<usize> {
86    fn width(&self) -> usize {
87        self.end - self.start
88    }
89
90    fn shift(&mut self, d: isize) {
91        if d >= 0 {
92            let u = d as usize;
93            self.start += u;
94            self.end += u;
95        } else {
96            let u = -d as usize;
97            self.start -= u;
98            self.end -= u;
99        }
100    }
101
102    fn contains(&self, other: &Self) -> bool {
103        self.start <= other.start && self.end >= other.end
104    }
105
106    fn intersects(&self, other: &Self) -> bool {
107        max(self.start, other.start) <= min(self.end, other.end)
108    }
109
110    fn intersection(&self, other: &Self) -> Self {
111        Self {
112            start: max(self.start, other.start),
113            end: min(self.end, other.end),
114        }
115    }
116
117    fn empty(&self) -> bool {
118        self.start == EMPTY_INDEX && self.end == EMPTY_INDEX
119    }
120}
121
122#[allow(clippy::reversed_empty_ranges)]
123pub const EMPTY_RANGE: Range<usize> = Range {
124    start: EMPTY_INDEX,
125    end: EMPTY_INDEX,
126};
127
128pub use sb::skia_textlayout_TextBaseline as TextBaseline;
129variant_name!(TextBaseline::Alphabetic);
130
131pub use sb::skia_textlayout_TextHeightBehavior as TextHeightBehavior;
132variant_name!(TextHeightBehavior::DisableFirstAscent);
133
134// m84: LineMetricStyle is declared but not used in the public API yet.
skia_safe/modules/paragraph/dart_types.rs

skia_safe/modules/paragraph/
dart_types.rs
