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Implement state-less scrolling in TextInput

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This commit is contained in:
Héctor Ramón Jiménez 2019-11-05 03:33:24 +01:00
parent 470266f540
commit a2161586da
1 changed files with 59 additions and 50 deletions
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109
wgpu/src/renderer/text_input.rs
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@ -87,70 +87,79 @@ impl text_input::Renderer for Renderer {
vertical_alignment: VerticalAlignment::Center,
};
let content = Primitive::Clip {
bounds: text_bounds,
offset: Vector::new(0, 0),
content: Box::new(if text_input.state.is_focused {
use wgpu_glyph::{GlyphCruncher, Scale, Section};
let (contents_primitive, offset) = if text_input.state.is_focused {
use wgpu_glyph::{GlyphCruncher, Scale, Section};
let text_before_cursor = &text_input
.value
.until(text_input.state.cursor_position(&text_input.value))
.to_string();
let text_before_cursor = &text_input
.value
.until(text_input.state.cursor_position(&text_input.value))
.to_string();
let mut text_value_width = self
.glyph_brush
.borrow_mut()
.glyph_bounds(Section {
text: text_before_cursor,
bounds: (f32::INFINITY, text_bounds.height),
scale: Scale { x: size, y: size },
..Default::default()
})
.map(|bounds| bounds.width().round())
.unwrap_or(0.0);
let mut text_value_width = self
.glyph_brush
.borrow_mut()
.glyph_bounds(Section {
text: text_before_cursor,
bounds: (f32::INFINITY, text_bounds.height),
scale: Scale { x: size, y: size },
..Default::default()
})
.map(|bounds| bounds.width().round())
.unwrap_or(0.0);
let spaces_at_the_end = text_before_cursor.len()
- text_before_cursor.trim_end().len();
let spaces_at_the_end =
text_before_cursor.len() - text_before_cursor.trim_end().len();
if spaces_at_the_end > 0 {
let space_width = {
let glyph_brush = self.glyph_brush.borrow();
if spaces_at_the_end > 0 {
let space_width = {
let glyph_brush = self.glyph_brush.borrow();
// TODO: Select appropriate font
let font = &glyph_brush.fonts()[0];
// TODO: Select appropriate font
let font = &glyph_brush.fonts()[0];
font.glyph(' ')
.scaled(Scale { x: size, y: size })
.h_metrics()
.advance_width
};
text_value_width += spaces_at_the_end as f32 * space_width;
}
let cursor = Primitive::Quad {
bounds: Rectangle {
x: text_bounds.x + text_value_width,
y: text_bounds.y,
width: 1.0,
height: text_bounds.height,
},
background: Background::Color(Color::BLACK),
border_radius: 0,
font.glyph(' ')
.scaled(Scale { x: size, y: size })
.h_metrics()
.advance_width
};
text_value_width += spaces_at_the_end as f32 * space_width;
}
let cursor = Primitive::Quad {
bounds: Rectangle {
x: text_bounds.x + text_value_width,
y: text_bounds.y,
width: 1.0,
height: text_bounds.height,
},
background: Background::Color(Color::BLACK),
border_radius: 0,
};
(
Primitive::Group {
primitives: vec![value, cursor],
}
} else {
value
}),
},
Vector::new(
((text_value_width + 5.0) - text_bounds.width).max(0.0)
as u32,
0,
),
)
} else {
(value, Vector::new(0, 0))
};
let contents = Primitive::Clip {
bounds: text_bounds,
offset,
content: Box::new(contents_primitive),
};
(
Primitive::Group {
primitives: vec![border, input, content],
primitives: vec![border, input, contents],
},
if is_mouse_over {
MouseCursor::Text