use serde::Deserialize;use ui::{Pixels, px}; #[derive(Debug)]pub enum ScrollDirection { Upwards, Downwards,} impl ScrollDirection { pub fn is_upwards(&self) -> bool { matches!(self, ScrollDirection::Upwards) }} #[derive(Debug, Clone, PartialEq, Deserialize)]pub enum ScrollAmount { // Scroll N lines (positive is towards the end of the document) Line(f32), // Scroll N pages (positive is towards the end of the document) Page(f32),} impl ScrollAmount { pub fn lines(&self, mut visible_line_count: f32) -> f32 { match self { Self::Line(count) => *count, Self::Page(count) => { // for full pages subtract one to leave an anchor line if self.is_full_page() { visible_line_count -= 1.0 } (visible_line_count * count).trunc() } } } pub fn pixels(&self, line_height: Pixels, height: Pixels) -> Pixels { match self { ScrollAmount::Line(x) => px(line_height.0 * x), ScrollAmount::Page(x) => px(height.0 * x), } } pub fn is_full_page(&self) -> bool { match self { ScrollAmount::Page(count) if count.abs() == 1.0 => true, _ => false, } } pub fn direction(&self) -> ScrollDirection { match self { Self::Line(amount) if amount.is_sign_positive() => ScrollDirection::Downwards, Self::Page(amount) if amount.is_sign_positive() => ScrollDirection::Downwards, _ => ScrollDirection::Upwards, } }}
use serde::Deserialize;
use ui::{Pixels, px};
#[derive(Debug)]
pub enum ScrollDirection {
Upwards,
Downwards,
}
impl ScrollDirection {
pub fn is_upwards(&self) -> bool {
matches!(self, ScrollDirection::Upwards)
}
}
#[derive(Debug, Clone, PartialEq, Deserialize)]
pub enum ScrollAmount {
// Scroll N lines (positive is towards the end of the document)
Line(f32),
// Scroll N pages (positive is towards the end of the document)
Page(f32),
}
impl ScrollAmount {
pub fn lines(&self, mut visible_line_count: f32) -> f32 {
match self {
Self::Line(count) => *count,
Self::Page(count) => {
// for full pages subtract one to leave an anchor line
if self.is_full_page() {
visible_line_count -= 1.0
}
(visible_line_count * count).trunc()
}
}
}
pub fn pixels(&self, line_height: Pixels, height: Pixels) -> Pixels {
match self {
ScrollAmount::Line(x) => px(line_height.0 * x),
ScrollAmount::Page(x) => px(height.0 * x),
}
}
pub fn is_full_page(&self) -> bool {
match self {
ScrollAmount::Page(count) if count.abs() == 1.0 => true,
_ => false,
}
}
pub fn direction(&self) -> ScrollDirection {
match self {
Self::Line(amount) if amount.is_sign_positive() => ScrollDirection::Downwards,
Self::Page(amount) if amount.is_sign_positive() => ScrollDirection::Downwards,
_ => ScrollDirection::Upwards,
}
}
}