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

//! Vertical overdraw options.
use crate::rendering::cursor::Cursor;
use core::ops::Range;
use embedded_graphics::fonts::Font;

/// Implementors of this trait specify how drawing vertically outside the bounding box is handled.
pub trait VerticalOverdraw: Copy {
    /// Calculate the range of rows of the current line that can be drawn.
    fn calculate_displayed_row_range<F: Font>(cursor: &Cursor<F>) -> Range<i32>;
}

/// Only render full rows of text.
#[derive(Copy, Clone, Debug)]
pub struct FullRowsOnly;
impl VerticalOverdraw for FullRowsOnly {
    #[inline]
    fn calculate_displayed_row_range<F: Font>(cursor: &Cursor<F>) -> Range<i32> {
        if cursor.in_display_area() {
            0..F::CHARACTER_SIZE.height as i32
        } else {
            0..0
        }
    }
}

/// Render partially visible rows, but only inside the bounding box.
#[derive(Copy, Clone, Debug)]
pub struct Hidden;
impl VerticalOverdraw for Hidden {
    #[inline]
    fn calculate_displayed_row_range<F: Font>(cursor: &Cursor<F>) -> Range<i32> {
        let offset_top = (cursor.bounds.top_left.y - cursor.position.y).max(0);
        // cursor bounds are one row shorter than real bounds for optimization
        // purposes so use the real height here
        let offset_bottom = (cursor.bounds.bottom_right.y + F::CHARACTER_SIZE.height as i32
            - cursor.position.y)
            .min(F::CHARACTER_SIZE.height as i32);

        offset_top..offset_bottom
    }
}

/// Display text even if it's outside the bounding box.
#[derive(Copy, Clone, Debug)]
pub struct Visible;
impl VerticalOverdraw for Visible {
    #[inline]
    fn calculate_displayed_row_range<F: Font>(_: &Cursor<F>) -> Range<i32> {
        0..F::CHARACTER_SIZE.height as i32
    }
}

#[cfg(test)]
mod test {
    use embedded_graphics::{
        fonts::Font6x8, mock_display::MockDisplay, pixelcolor::BinaryColor, prelude::*,
        primitives::Rectangle,
    };

    use crate::{
        alignment::*,
        style::{height_mode::Exact, vertical_overdraw::*, TextBoxStyleBuilder},
        TextBox,
    };

    #[test]
    fn default_is_full_rows_only() {
        // This test verifies that FullRowsOnly does not draw partial rows

        let mut display = MockDisplay::new();
        let style = TextBoxStyleBuilder::new(Font6x8)
            .alignment(LeftAligned)
            .text_color(BinaryColor::On)
            .build();

        TextBox::new(
            "word and other words",
            Rectangle::new(Point::new(0, 0), Point::new(54, 14)),
        )
        .into_styled(style)
        .draw(&mut display)
        .unwrap();

        assert_eq!(
            display,
            MockDisplay::from_pattern(&[
                "                      #                       #",
                "                      #                       #",
                "#   #  ###  # ##   ## #        ###  # ##   ## #",
                "#   # #   # ##  # #  ##           # ##  # #  ##",
                "# # # #   # #     #   #        #### #   # #   #",
                "# # # #   # #     #   #       #   # #   # #   #",
                " # #   ###  #      ####        #### #   #  ####",
                "                                               ",
            ])
        );
    }

    #[test]
    fn visible_displays_regardless_of_bounds() {
        // This test verifies that FullRowsOnly does not draw partial rows

        let mut display = MockDisplay::new();
        let style = TextBoxStyleBuilder::new(Font6x8)
            .alignment(LeftAligned)
            .vertical_alignment(CenterAligned)
            .text_color(BinaryColor::On)
            .height_mode(Exact(Visible))
            .build();

        TextBox::new("word", Rectangle::new(Point::new(0, 2), Point::new(54, 5)))
            .into_styled(style)
            .draw(&mut display)
            .unwrap();

        assert_eq!(
            display,
            MockDisplay::from_pattern(&[
                "                      #",
                "                      #",
                "#   #  ###  # ##   ## #",
                "#   # #   # ##  # #  ##",
                "# # # #   # #     #   #",
                "# # # #   # #     #   #",
                " # #   ###  #      ####",
                "                       ",
            ])
        );
    }

    #[test]
    fn hidden_only_displays_visible_rows() {
        // This test verifies that FullRowsOnly does not draw partial rows

        let mut display = MockDisplay::new();
        let style = TextBoxStyleBuilder::new(Font6x8)
            .alignment(LeftAligned)
            .vertical_alignment(CenterAligned)
            .text_color(BinaryColor::On)
            .height_mode(Exact(Hidden))
            .build();

        TextBox::new("word", Rectangle::new(Point::new(0, 2), Point::new(54, 5)))
            .into_styled(style)
            .draw(&mut display)
            .unwrap();

        assert_eq!(
            display,
            MockDisplay::from_pattern(&[
                "                       ",
                "                       ",
                "#   #  ###  # ##   ## #",
                "#   # #   # ##  # #  ##",
                "# # # #   # #     #   #",
                "# # # #   # #     #   #",
                "                       ",
                "                       ",
            ])
        );
    }
}