xengui 0.2.1

wgpu based, modern and high-performance GUI library.
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
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

// SPDX-License-Identifier: Apache-2.0
use crate::{
    LayoutBox, LayoutContext, PaintContext, RectCommand, Style, StyleBuilder, TextCommand, VNode,
};
use smol_str::SmolStr;

#[macro_export]
macro_rules! props {
    ($($field:ident : $val:expr),* $(,)?) => {
        #[allow(clippy::needless_update)]
        TextProps {
            $( $field: Some(($val).into()), )*
            ..Default::default()
        }
    };
}

pub struct Text {
    pub key: String,
    pub is_dirty: bool,

    content: SmolStr,
    position: (f32, f32),

    font: Option<SmolStr>,

    pub style: Style,
    layout_box: LayoutBox,
}

impl Text {
    pub fn new(key: impl Into<String>) -> Self {
        Self {
            key: key.into(),
            is_dirty: true,

            content: SmolStr::new(""),
            position: (0.0, 0.0),
            font: None,

            style: Style::default(),
            layout_box: LayoutBox::default(),
        }
    }

    // Builder methods
    pub fn text(mut self, text: impl Into<SmolStr>) -> Self {
        self.content = text.into();
        self.set_dirty(true);
        self
    }

    pub fn position(mut self, position: (f32, f32)) -> Self {
        self.position = position;
        self.set_dirty(true);
        self
    }

    pub fn font(mut self, font: impl Into<SmolStr>) -> Self {
        self.font = Some(font.into());
        self.set_dirty(true);
        self
    }
}

impl StyleBuilder for Text {
    fn style_mut(&mut self) -> &mut Style {
        &mut self.style
    }

    fn mark_dirty(&mut self) {
        self.set_dirty(true);
    }
}

impl VNode for Text {
    fn as_any_mut(&mut self) -> &mut dyn std::any::Any {
        self
    }

    fn key(&self) -> &str {
        &self.key
    }

    fn is_dirty(&self) -> bool {
        self.is_dirty
    }

    fn set_dirty(&mut self, dirty: bool) {
        self.is_dirty = dirty;
    }

    fn paint(&self, ctx: &mut PaintContext) {
        if ctx.debug {
            log::info!(
                "paint -> '{}' x={} y={}",
                self.content,
                self.layout_box.x,
                self.layout_box.y,
            );
        }

        if self.style.background.is_some() {
            ctx.draw_rect(RectCommand {
                position: (self.layout_box.x, self.layout_box.y),
                size: (self.layout_box.width, self.layout_box.height),
                background: self.style.background.clone(),
                border_radius: None,
            });
        }

        ctx.draw_text(TextCommand {
            text: self.content.clone(),
            position: (self.layout_box.x, self.layout_box.y),
            style: self.style.clone(),
            font: self.font.clone(),
        });
    }

    fn measure(&self, ctx: &LayoutContext) -> (f32, f32) {
        let scale_factor = ctx.scale_factor;

        let font_size = self
            .style
            .font_size
            .map(|s| s.to_physical(scale_factor))
            .unwrap_or(20.0 * scale_factor);

        let letter_spacing = self
            .style
            .letter_spacing
            .map(|ls| ls.value().to_physical(scale_factor))
            .unwrap_or(0.0);

        ctx.text.measure(
            &self.content,
            self.font.as_deref(),
            font_size,
            self.style.font_weight.unwrap_or_default(),
            self.style.font_style.unwrap_or_default(),
            letter_spacing,
        )
    }

    fn layout(&mut self, rect: LayoutBox) {
        self.layout_box = rect;
    }

    fn layout_box(&self) -> &LayoutBox {
        &self.layout_box
    }
}