use serde::Deserialize;use ui::Pixels;#[derive(Debug)]pub enum ScrollDirection { Upwards, Downwards, Rightwards, Leftwards,}impl ScrollDirection { pub fn is_upwards(&self) -> bool { matches!(self, ScrollDirection::Upwards) }}#[derive(Debug, Clone, Copy, 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), // Scroll N columns (positive is towards the right of the document) Column(f32), // Scroll N page width (positive is towards the right of the document) PageWidth(f32),}impl ScrollAmount { pub fn lines(&self, mut visible_line_count: f64) -> f64 { match self { Self::Line(count) => *count as f64, 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 as f64)).trunc() } Self::Column(_count) => 0.0, Self::PageWidth(_count) => 0.0, } } pub fn columns(&self, visible_column_count: f64) -> f64 { match self { Self::Line(_count) => 0.0, Self::Page(_count) => 0.0, Self::Column(count) => *count as f64, Self::PageWidth(count) => (visible_column_count * *count as f64).trunc(), } } pub fn pixels(&self, line_height: Pixels, height: Pixels) -> Pixels { match self { ScrollAmount::Line(x) => line_height * *x, ScrollAmount::Page(x) => height * *x, // This function seems to only be leveraged by the popover that is // displayed by the editor when, for example, viewing a function's // documentation. Right now that only supports vertical scrolling, // so I'm leaving this at 0.0 for now to try and make it clear that // this should not have an impact on that? ScrollAmount::Column(_) => Pixels::ZERO, ScrollAmount::PageWidth(_) => Pixels::ZERO, } } pub fn is_full_page(&self) -> bool { matches!(self, ScrollAmount::Page(count) if count.abs() == 1.0) } 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, Self::Column(amount) if amount.is_sign_positive() => ScrollDirection::Rightwards, Self::Column(amount) if amount.is_sign_negative() => ScrollDirection::Leftwards, _ => ScrollDirection::Upwards, } }}
use serde::Deserialize;
use ui::Pixels;
#[derive(Debug)]
pub enum ScrollDirection {
Upwards,
Downwards,
Rightwards,
Leftwards,
}
impl ScrollDirection {
pub fn is_upwards(&self) -> bool {
matches!(self, ScrollDirection::Upwards)
}
}
#[derive(Debug, Clone, Copy, 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),
// Scroll N columns (positive is towards the right of the document)
Column(f32),
// Scroll N page width (positive is towards the right of the document)
PageWidth(f32),
}
impl ScrollAmount {
pub fn lines(&self, mut visible_line_count: f64) -> f64 {
match self {
Self::Line(count) => *count as f64,
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 as f64)).trunc()
}
Self::Column(_count) => 0.0,
Self::PageWidth(_count) => 0.0,
}
}
pub fn columns(&self, visible_column_count: f64) -> f64 {
match self {
Self::Line(_count) => 0.0,
Self::Page(_count) => 0.0,
Self::Column(count) => *count as f64,
Self::PageWidth(count) => (visible_column_count * *count as f64).trunc(),
}
}
pub fn pixels(&self, line_height: Pixels, height: Pixels) -> Pixels {
match self {
ScrollAmount::Line(x) => line_height * *x,
ScrollAmount::Page(x) => height * *x,
// This function seems to only be leveraged by the popover that is
// displayed by the editor when, for example, viewing a function's
// documentation. Right now that only supports vertical scrolling,
// so I'm leaving this at 0.0 for now to try and make it clear that
// this should not have an impact on that?
ScrollAmount::Column(_) => Pixels::ZERO,
ScrollAmount::PageWidth(_) => Pixels::ZERO,
}
}
pub fn is_full_page(&self) -> bool {
matches!(self, ScrollAmount::Page(count) if count.abs() == 1.0)
}
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,
Self::Column(amount) if amount.is_sign_positive() => ScrollDirection::Rightwards,
Self::Column(amount) if amount.is_sign_negative() => ScrollDirection::Leftwards,
_ => ScrollDirection::Upwards,
}
}
}