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Do not use start/end for TextCursor, only index

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This commit is contained in:
Jeremy Soller 2022-10-21 11:44:11 -06:00
parent eacd09b167
commit 784215e490
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GPG key ID: 87F211AF2BE4C2FE
1 changed files with 31 additions and 47 deletions
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78
src/buffer.rs
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@ -46,15 +46,13 @@ pub enum TextAction {
pub struct TextCursor {
/// Text line the cursor is on
pub line: TextLineIndex,
/// Start of glyph (behind cursor)
pub start: usize,
/// End of glyph (after cursor)
pub end: usize,
/// Index of glyph at cursor (will insert behind this glyph)
pub index: usize,
}
impl TextCursor {
pub const fn new(line: TextLineIndex, start: usize, end: usize) -> Self {
Self { line, start, end }
pub const fn new(line: TextLineIndex, index: usize) -> Self {
Self { line, index }
}
}
@ -240,7 +238,7 @@ impl<'a> TextBuffer<'a> {
for layout_line in layout {
let mut found = false;
for glyph in layout_line.glyphs.iter() {
if glyph.start <= self.cursor.end {
if glyph.start <= self.cursor.index {
found = true;
break;
}
@ -427,10 +425,9 @@ impl<'a> TextBuffer<'a> {
} else {
let line = &mut self.lines[self.cursor.line.get()];
line.reset();
line.text.insert(self.cursor.end, character);
line.text.insert(self.cursor.index, character);
self.cursor.start = self.cursor.end;
self.cursor.end += character.len_utf8();
self.cursor.index += character.len_utf8();
self.shape_until_cursor(CursorScroll::Bottom);
},
@ -439,27 +436,29 @@ impl<'a> TextBuffer<'a> {
self.lines.insert(next_line, TextBufferLine::new(String::new()));
self.cursor.line = TextLineIndex::new(next_line);
self.cursor.start = 0;
self.cursor.end = 0;
self.cursor.index = 0;
self.shape_until_cursor(CursorScroll::Bottom);
},
TextAction::Backspace => {
if self.cursor.end > 0 {
if self.cursor.index > 0 {
let line = &mut self.lines[self.cursor.line.get()];
line.reset();
line.text.remove(self.cursor.start);
self.cursor.end = self.cursor.start;
self.cursor.start = 0;
// Find previous character index
let mut prev_index = 0;
for (i, _) in line.text.char_indices() {
if i == self.cursor.end {
break;
if i < self.cursor.index {
prev_index = i;
} else {
self.cursor.start = i;
break;
}
}
self.cursor.index = prev_index;
line.text.remove(self.cursor.index);
self.shape_until_cursor(CursorScroll::Top);
} else if self.cursor.line.get() > 0 {
let mut line_index = self.cursor.line.get();
@ -470,15 +469,7 @@ impl<'a> TextBuffer<'a> {
line.reset();
self.cursor.line = TextLineIndex::new(line_index);
self.cursor.end = line.text.len();
self.cursor.start = 0;
for (i, _) in line.text.char_indices() {
if i == self.cursor.end {
break;
} else {
self.cursor.start = i;
}
}
self.cursor.index = line.text.len();
line.text.push_str(&old_line.text);
@ -559,23 +550,17 @@ impl<'a> TextBuffer<'a> {
}
}
let mut new_cursor = TextCursor::new(
TextLineIndex::new(line_i),
0,
0
);
let mut new_cursor = TextCursor::new(TextLineIndex::new(line_i), 0);
match layout_line.glyphs.get(new_cursor_glyph) {
Some(glyph) => {
// Position at glyph
new_cursor.start = glyph.start;
new_cursor.end = glyph.end;
new_cursor.index = glyph.start;
},
None => match layout_line.glyphs.last() {
Some(glyph) => {
// Position at end of line
new_cursor.start = glyph.end;
new_cursor.end = glyph.end;
new_cursor.index = glyph.end;
},
None => {
// Keep at start of empty line
@ -590,10 +575,9 @@ impl<'a> TextBuffer<'a> {
if let Some(glyph) = layout_line.glyphs.get(new_cursor_glyph) {
let text_glyph = &line.text[glyph.start..glyph.end];
log::debug!(
"{}, {}, {}: '{}' ('{}'): '{}' ({:?})",
"{}, {}: '{}' ('{}'): '{}' ({:?})",
self.cursor.line.get(),
self.cursor.start,
self.cursor.end,
self.cursor.index,
glyph.font.info.family,
glyph.font.info.post_script_name,
text_glyph,
@ -648,9 +632,9 @@ impl<'a> TextBuffer<'a> {
let cursor_glyph_opt = |cursor: &TextCursor| -> Option<usize> {
let mut glyph_i_opt = None;
for (glyph_i, glyph) in layout_line.glyphs.iter().enumerate() {
if cursor.start == glyph.start {
if cursor.index == glyph.start {
glyph_i_opt = Some(glyph_i);
} else if cursor.start == glyph.end {
} else if cursor.index == glyph.end {
glyph_i_opt = Some(glyph_i + 1);
}
}
@ -665,10 +649,10 @@ impl<'a> TextBuffer<'a> {
(self.cursor, select)
} else {
/* select.line == self.cursor.line */
if select.start < self.cursor.start {
if select.index < self.cursor.index {
(select, self.cursor)
} else {
/* select.start >= self.cursor.start */
/* select.index >= self.cursor.index */
(self.cursor, select)
}
};
@ -682,7 +666,7 @@ impl<'a> TextBuffer<'a> {
if line_i == start.line.get() && line_i == end.line.get() {
// On edge of start and end line, check if any contained glyphs are after start and before end
for glyph in layout_line.glyphs.iter() {
if glyph.start >= start.start && glyph.end <= end.end{
if glyph.start >= start.index && glyph.end <= end.index {
inside = true;
break;
}
@ -690,7 +674,7 @@ impl<'a> TextBuffer<'a> {
} else if line_i == start.line.get() {
// On edge of start line, check if any contained glyphs are after start
for glyph in layout_line.glyphs.iter() {
if glyph.start >= start.start {
if glyph.start >= start.index {
inside = true;
break;
}
@ -698,7 +682,7 @@ impl<'a> TextBuffer<'a> {
} else if line_i == end.line.get() {
// On edge of end line, check if any contained glyphs are before end
for glyph in layout_line.glyphs.iter() {
if glyph.end <= end.end {
if glyph.end <= end.index {
inside = true;
break;
}