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Fix scrolling calculations.

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This commit is contained in:
Blaž Hrastnik 2020-10-07 13:58:13 +09:00
parent 750610f0e7
commit 61ef0a4e87
2 changed files with 13 additions and 9 deletions
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18
helix-view/src/commands.rs
View file

@ -13,7 +13,7 @@ use crate::view::View;
/// state (usually by creating and applying a transaction).
pub type Command = fn(view: &mut View, count: usize);
const PADDING: u16 = 10;
const PADDING: u16 = 5;
pub fn move_char_left(view: &mut View, count: usize) {
// TODO: use a transaction
@ -138,10 +138,9 @@ pub fn move_file_end(view: &mut View, _count: usize) {
pub fn check_cursor_in_view(view: &mut View) -> bool {
let cursor = view.state.selection().cursor();
let line = view.state.doc().char_to_line(cursor) as u16;
let document_end = view.first_line + view.size.1.saturating_sub(2);
let padding = 5u16;
let document_end = view.first_line + view.size.1.saturating_sub(1);
if (line > document_end.saturating_sub(padding)) | (line < view.first_line + padding) {
if (line > document_end.saturating_sub(PADDING)) | (line < view.first_line + PADDING) {
return false;
}
true
@ -150,10 +149,14 @@ pub fn check_cursor_in_view(view: &mut View) -> bool {
pub fn page_up(view: &mut View, _count: usize) {
let text = &view.state.doc;
view.first_line = view.first_line.saturating_sub(view.size.1);
let pos = text.line_to_char(view.first_line as usize);
let pos = text.line_to_char(view.last_line() as usize);
if !check_cursor_in_view(view) {
let text = &view.state.doc;
let pos = text.line_to_char(view.last_line().saturating_sub(PADDING as usize));
view.state.selection = Selection::single(pos, pos);
}
}
pub fn page_down(view: &mut View, _count: usize) {
let text = &view.state.doc;
@ -168,13 +171,14 @@ pub fn half_page_up(view: &mut View, _count: usize) {
view.first_line = view.first_line.saturating_sub(view.size.1 / 2);
if !check_cursor_in_view(view) {
let text = &view.state.doc;
let pos = text.line_to_char(view.first_line as usize);
let pos = text.line_to_char(view.last_line() - PADDING as usize);
view.state.selection = Selection::single(pos, pos);
}
}
pub fn half_page_down(view: &mut View, _count: usize) {
if view.first_line < view.state.doc().len_lines() as u16 - view.size.1 {
let lines = view.state.doc().len_lines();
if view.first_line < lines.saturating_sub(view.size.1 as usize) as u16 {
view.first_line += view.size.1 / 2;
}
if !check_cursor_in_view(view) {

2
helix-view/src/view.rs
View file

@ -34,7 +34,7 @@ impl View {
pub fn ensure_cursor_in_view(&mut self) {
let cursor = self.state.selection().cursor();
let line = self.state.doc().char_to_line(cursor) as u16;
let document_end = self.first_line + self.size.1.saturating_sub(2);
let document_end = self.first_line + self.size.1.saturating_sub(1);
let padding = 5u16;