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|
use std::io::{BufRead, BufReader};
use strip_ansi_escapes::strip;
use crate::files::File;
use crate::term::sized_string_u;
use crate::widget::{Widget, WidgetCore};
use crate::fail::{HResult, HError};
use crate::dirty::Dirtyable;
#[derive(Debug, PartialEq)]
pub struct TextView {
pub lines: Vec<String>,
pub core: WidgetCore,
pub follow: bool,
pub offset: usize,
}
impl TextView {
pub fn new_blank(core: &WidgetCore) -> TextView {
TextView {
lines: vec![],
core: core.clone(),
follow: false,
offset: 0,
}
}
pub fn new_from_file(core: &WidgetCore, file: &File) -> HResult<TextView> {
let file = std::fs::File::open(&file.path)?;
let file = std::io::BufReader::new(file);
let lines = file.lines()
.map(|line| line
.and_then(|l| strip(l))
.map_err(HError::from)
.and_then(|s| std::str::from_utf8(&s)
.map(|s| s.to_string())
.map_err(HError::from)))
.collect::<HResult<_>>()?;
Ok(TextView {
lines: lines,
core: core.clone(),
follow: false,
offset: 0,
})
}
pub fn new_from_file_limit_lines(core: &WidgetCore,
file: &File,
num: usize) -> HResult<TextView> {
let file = std::fs::File::open(&file.path)?;
let file = BufReader::new(file);
let lines = file.lines()
.take(num)
.map(|line| line
.and_then(|l| strip(l))
.map_err(HError::from)
.and_then(|s| std::str::from_utf8(&s)
.map(|s| s.to_string())
.map_err(HError::from)))
.collect::<HResult<_>>()?;
Ok(TextView {
lines: lines,
core: core.clone(),
follow: false,
offset: 0,
})
}
pub fn set_text(&mut self, text: &str) -> HResult<()> {
let lines = text.lines().map(|l| l.to_string()).collect();
self.lines = lines;
self.core.set_dirty();
self.refresh()
}
pub fn toggle_follow(&mut self) {
self.follow = !self.follow
}
pub fn scroll(&mut self, amount: isize) {
let ysize = self.get_coordinates().unwrap().ysize() as isize;
let offset = self.offset as isize;
let len = self.lines.len() as isize;
if len <= ysize + offset { return }
if amount > 0 {
if ysize + amount + offset + 1 >= len {
// Too far down
self.offset = (len - ysize - 1) as usize;
} else {
self.offset = (offset as isize + amount) as usize;
}
} else if amount < 0 {
if offset + amount >= 0 {
self.offset = (offset + amount) as usize;
} else {
self.offset = 0;
}
}
if offset != self.offset as isize {
self.core.set_dirty();
}
}
pub fn scroll_up(&mut self) {
self.scroll(-1);
}
pub fn scroll_down(&mut self) {
self.scroll(1);
}
pub fn page_up(&mut self) {
let ysize = self.get_coordinates().unwrap().ysize() as isize;
self.scroll(0 - ysize + 1);
}
pub fn page_down(&mut self) {
let ysize = self.get_coordinates().unwrap().ysize() as isize;
self.scroll(ysize - 1);
}
pub fn scroll_top(&mut self) {
self.offset = 0;
}
pub fn scroll_bottom(&mut self) {
let len = self.lines.len() as isize;
self.scroll(len);
}
}
impl Widget for TextView {
fn get_core(&self) -> HResult<&WidgetCore> {
Ok(&self.core)
}
fn get_core_mut(&mut self) -> HResult<&mut WidgetCore> {
Ok(&mut self.core)
}
fn refresh(&mut self) -> HResult<()> {
// let (xsize, ysize) = self.get_coordinates()?.size().size();
// let (xpos, ypos) = self.get_coordinates()?.position().position();
// let len = self.lines.len();
if self.follow {
self.scroll_bottom();
}
if self.core.is_dirty() {
self.core.set_clean();
}
Ok(())
}
fn get_drawlist(&self) -> HResult<String> {
let (xsize, ysize) = self.get_coordinates()?.size().size();
let (xpos, ypos) = self.get_coordinates()?.position().position();
let output = self.core.get_clearlist()? +
&self
.lines
.iter()
.skip(self.offset)
.take(ysize as usize)
.enumerate()
.map(|(i, line)| {
format!(
"{}{}{}",
crate::term::goto_xy(xpos, i as u16 + ypos),
crate::term::reset(),
sized_string_u(&line, (xsize-1) as usize))
})
.collect::<String>();
Ok(output)
}
}
|
