Struct cosmic_text::Buffer
source · pub struct Buffer<'a> {
pub lines: Vec<BufferLine>,
/* private fields */
}Expand description
A buffer of text that is shaped and laid out
Fields§
§lines: Vec<BufferLine>BufferLines (or paragraphs) of text in the buffer
Implementations§
source§impl<'a> Buffer<'a>
impl<'a> Buffer<'a>
sourcepub fn new(font_system: &'a FontSystem, metrics: Metrics) -> Self
pub fn new(font_system: &'a FontSystem, metrics: Metrics) -> Self
Create a new Buffer with the provided FontSystem and Metrics
sourcepub fn shape_until(&mut self, lines: i32) -> i32
pub fn shape_until(&mut self, lines: i32) -> i32
Pre-shape lines in the buffer, up to lines, return actual number of layout lines
Examples found in repository?
src/buffer.rs (line 284)
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pub fn shape_until_scroll(&mut self) {
let lines = self.visible_lines();
let scroll_end = self.scroll + lines;
let total_layout = self.shape_until(scroll_end);
self.scroll = cmp::max(
0,
cmp::min(
total_layout - (lines - 1),
self.scroll,
),
);
}sourcepub fn shape_until_cursor(&mut self, cursor: Cursor)
pub fn shape_until_cursor(&mut self, cursor: Cursor)
Shape lines until cursor, also scrolling to include cursor in view
sourcepub fn shape_until_scroll(&mut self)
pub fn shape_until_scroll(&mut self)
Shape lines until scroll
Examples found in repository?
More examples
src/buffer.rs (line 276)
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pub fn shape_until_cursor(&mut self, cursor: Cursor) {
#[cfg(feature = "std")]
let instant = std::time::Instant::now();
let mut reshaped = 0;
let mut layout_i = 0;
for (line_i, line) in self.lines.iter_mut().enumerate() {
if line_i > cursor.line {
break;
}
if line.shape_opt().is_none() {
reshaped += 1;
}
let layout = line.layout(
self.font_system,
self.metrics.font_size,
self.width
);
if line_i == cursor.line {
let layout_cursor = self.layout_cursor(&cursor);
layout_i += layout_cursor.layout as i32;
break;
} else {
layout_i += layout.len() as i32;
}
}
if reshaped > 0 {
#[cfg(feature = "std")]
log::debug!("shape_until_cursor {}: {:?}", reshaped, instant.elapsed());
self.redraw = true;
}
let lines = self.visible_lines();
if layout_i < self.scroll {
self.scroll = layout_i;
} else if layout_i >= self.scroll + lines {
self.scroll = layout_i - (lines - 1);
}
self.shape_until_scroll();
}
/// Shape lines until scroll
pub fn shape_until_scroll(&mut self) {
let lines = self.visible_lines();
let scroll_end = self.scroll + lines;
let total_layout = self.shape_until(scroll_end);
self.scroll = cmp::max(
0,
cmp::min(
total_layout - (lines - 1),
self.scroll,
),
);
}
pub fn layout_cursor(&self, cursor: &Cursor) -> LayoutCursor {
let line = &self.lines[cursor.line];
//TODO: ensure layout is done?
let layout = line.layout_opt().as_ref().expect("layout not found");
for (layout_i, layout_line) in layout.iter().enumerate() {
for (glyph_i, glyph) in layout_line.glyphs.iter().enumerate() {
if cursor.index == glyph.start {
return LayoutCursor::new(
cursor.line,
layout_i,
glyph_i
);
}
}
match layout_line.glyphs.last() {
Some(glyph) => {
if cursor.index == glyph.end {
return LayoutCursor::new(
cursor.line,
layout_i,
layout_line.glyphs.len()
);
}
},
None => {
return LayoutCursor::new(
cursor.line,
layout_i,
0
);
}
}
}
// Fall back to start of line
//TODO: should this be the end of the line?
LayoutCursor::new(
cursor.line,
0,
0
)
}
/// Get [`FontSystem`] used by this [`Buffer`]
pub fn font_system(&self) -> &'a FontSystem {
self.font_system
}
/// Shape the provided line index and return the result
pub fn line_shape(&mut self, line_i: usize) -> Option<&ShapeLine> {
let line = self.lines.get_mut(line_i)?;
Some(line.shape(self.font_system))
}
/// Lay out the provided line index and return the result
pub fn line_layout(&mut self, line_i: usize) -> Option<&[LayoutLine]> {
let line = self.lines.get_mut(line_i)?;
Some(line.layout(self.font_system, self.metrics.font_size, self.width))
}
/// Get the current [`Metrics`]
pub fn metrics(&self) -> Metrics {
self.metrics
}
/// Set the current [`Metrics`]
pub fn set_metrics(&mut self, metrics: Metrics) {
if metrics != self.metrics {
self.metrics = metrics;
self.relayout();
self.shape_until_scroll();
}
}
/// Get the current buffer dimensions (width, height)
pub fn size(&self) -> (i32, i32) {
(self.width, self.height)
}
/// Set the current buffer dimensions
pub fn set_size(&mut self, width: i32, height: i32) {
if width != self.width || height != self.height {
self.width = width;
self.height = height;
self.relayout();
self.shape_until_scroll();
}
}
/// Get the current scroll location
pub fn scroll(&self) -> i32 {
self.scroll
}
/// Set the current scroll location
pub fn set_scroll(&mut self, scroll: i32) {
if scroll != self.scroll {
self.scroll = scroll;
self.redraw = true;
}
}
/// Get the number of lines that can be viewed in the buffer
pub fn visible_lines(&self) -> i32 {
self.height / self.metrics.line_height
}
/// Set text of buffer, using provided attributes for each line by default
pub fn set_text(&mut self, text: &str, attrs: Attrs<'a>) {
self.lines.clear();
for line in text.lines() {
self.lines.push(BufferLine::new(line.to_string(), AttrsList::new(attrs)));
}
// Make sure there is always one line
if self.lines.is_empty() {
self.lines.push(BufferLine::new(String::new(), AttrsList::new(attrs)));
}
self.scroll = 0;
self.shape_until_scroll();
}sourcepub fn layout_cursor(&self, cursor: &Cursor) -> LayoutCursor
pub fn layout_cursor(&self, cursor: &Cursor) -> LayoutCursor
Examples found in repository?
src/buffer.rs (line 255)
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pub fn shape_until_cursor(&mut self, cursor: Cursor) {
#[cfg(feature = "std")]
let instant = std::time::Instant::now();
let mut reshaped = 0;
let mut layout_i = 0;
for (line_i, line) in self.lines.iter_mut().enumerate() {
if line_i > cursor.line {
break;
}
if line.shape_opt().is_none() {
reshaped += 1;
}
let layout = line.layout(
self.font_system,
self.metrics.font_size,
self.width
);
if line_i == cursor.line {
let layout_cursor = self.layout_cursor(&cursor);
layout_i += layout_cursor.layout as i32;
break;
} else {
layout_i += layout.len() as i32;
}
}
if reshaped > 0 {
#[cfg(feature = "std")]
log::debug!("shape_until_cursor {}: {:?}", reshaped, instant.elapsed());
self.redraw = true;
}
let lines = self.visible_lines();
if layout_i < self.scroll {
self.scroll = layout_i;
} else if layout_i >= self.scroll + lines {
self.scroll = layout_i - (lines - 1);
}
self.shape_until_scroll();
}More examples
src/edit/editor.rs (line 270)
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fn action(&mut self, action: Action) {
let old_cursor = self.cursor;
match action {
Action::Previous => {
let line = &mut self.buffer.lines[self.cursor.line];
if self.cursor.index > 0 {
// Find previous character index
let mut prev_index = 0;
for (i, _) in line.text().grapheme_indices(true) {
if i < self.cursor.index {
prev_index = i;
} else {
break;
}
}
self.cursor.index = prev_index;
self.buffer.set_redraw(true);
} else if self.cursor.line > 0 {
self.cursor.line -= 1;
self.cursor.index = self.buffer.lines[self.cursor.line].text().len();
self.buffer.set_redraw(true);
}
self.cursor_x_opt = None;
},
Action::Next => {
let line = &mut self.buffer.lines[self.cursor.line];
if self.cursor.index < line.text().len() {
for (i, c) in line.text().grapheme_indices(true) {
if i == self.cursor.index {
self.cursor.index += c.len();
self.buffer.set_redraw(true);
break;
}
}
} else if self.cursor.line + 1 < self.buffer.lines.len() {
self.cursor.line += 1;
self.cursor.index = 0;
self.buffer.set_redraw(true);
}
self.cursor_x_opt = None;
},
Action::Left => {
let rtl_opt = self.buffer.lines[self.cursor.line].shape_opt().as_ref().map(|shape| shape.rtl);
if let Some(rtl) = rtl_opt {
if rtl {
self.action(Action::Next);
} else {
self.action(Action::Previous);
}
}
},
Action::Right => {
let rtl_opt = self.buffer.lines[self.cursor.line].shape_opt().as_ref().map(|shape| shape.rtl);
if let Some(rtl) = rtl_opt {
if rtl {
self.action(Action::Previous);
} else {
self.action(Action::Next);
}
}
},
Action::Up => {
//TODO: make this preserve X as best as possible!
let mut cursor = self.buffer.layout_cursor(&self.cursor);
if self.cursor_x_opt.is_none() {
self.cursor_x_opt = Some(
cursor.glyph as i32 //TODO: glyph x position
);
}
if cursor.layout > 0 {
cursor.layout -= 1;
} else if cursor.line > 0 {
cursor.line -= 1;
cursor.layout = usize::max_value();
}
if let Some(cursor_x) = self.cursor_x_opt {
cursor.glyph = cursor_x as usize; //TODO: glyph x position
}
self.set_layout_cursor(cursor);
},
Action::Down => {
//TODO: make this preserve X as best as possible!
let mut cursor = self.buffer.layout_cursor(&self.cursor);
let layout_len = self.buffer.line_layout(cursor.line).expect("layout not found").len();
if self.cursor_x_opt.is_none() {
self.cursor_x_opt = Some(
cursor.glyph as i32 //TODO: glyph x position
);
}
if cursor.layout + 1 < layout_len {
cursor.layout += 1;
} else if cursor.line + 1 < self.buffer.lines.len() {
cursor.line += 1;
cursor.layout = 0;
}
if let Some(cursor_x) = self.cursor_x_opt {
cursor.glyph = cursor_x as usize; //TODO: glyph x position
}
self.set_layout_cursor(cursor);
},
Action::Home => {
let mut cursor = self.buffer.layout_cursor(&self.cursor);
cursor.glyph = 0;
self.set_layout_cursor(cursor);
self.cursor_x_opt = None;
},
Action::End => {
let mut cursor = self.buffer.layout_cursor(&self.cursor);
cursor.glyph = usize::max_value();
self.set_layout_cursor(cursor);
self.cursor_x_opt = None;
}
Action::PageUp => {
//TODO: move cursor
let mut scroll = self.buffer.scroll();
scroll -= self.buffer.visible_lines();
self.buffer.set_scroll(scroll);
},
Action::PageDown => {
//TODO: move cursor
let mut scroll = self.buffer.scroll();
scroll += self.buffer.visible_lines();
self.buffer.set_scroll(scroll);
},
Action::Escape => {
if self.select_opt.take().is_some() {
self.buffer.set_redraw(true);
}
},
Action::Insert(character) => {
if character.is_control()
&& !['\t', '\u{92}'].contains(&character)
{
// Filter out special chars (except for tab), use Action instead
log::debug!("Refusing to insert control character {:?}", character);
} else {
self.delete_selection();
let line = &mut self.buffer.lines[self.cursor.line];
// Collect text after insertion as a line
let after = line.split_off(self.cursor.index);
// Append the inserted text
line.append(BufferLine::new(
character.to_string(),
AttrsList::new(line.attrs_list().defaults() /*TODO: provide attrs?*/)
));
// Append the text after insertion
line.append(after);
self.cursor.index += character.len_utf8();
}
},
Action::Enter => {
self.delete_selection();
let new_line = self.buffer.lines[self.cursor.line].split_off(self.cursor.index);
self.cursor.line += 1;
self.cursor.index = 0;
self.buffer.lines.insert(self.cursor.line, new_line);
},
Action::Backspace => {
if self.delete_selection() {
// Deleted selection
} else if self.cursor.index > 0 {
let line = &mut self.buffer.lines[self.cursor.line];
// Get text line after cursor
let after = line.split_off(self.cursor.index);
// Find previous character index
let mut prev_index = 0;
for (i, _) in line.text().char_indices() {
if i < self.cursor.index {
prev_index = i;
} else {
break;
}
}
self.cursor.index = prev_index;
// Remove character
line.split_off(self.cursor.index);
// Add text after cursor
line.append(after);
} else if self.cursor.line > 0 {
let mut line_index = self.cursor.line;
let old_line = self.buffer.lines.remove(line_index);
line_index -= 1;
let line = &mut self.buffer.lines[line_index];
self.cursor.line = line_index;
self.cursor.index = line.text().len();
line.append(old_line);
}
},
Action::Delete => {
if self.delete_selection() {
// Deleted selection
} else if self.cursor.index < self.buffer.lines[self.cursor.line].text().len() {
let line = &mut self.buffer.lines[self.cursor.line];
let range_opt = line
.text()
.grapheme_indices(true)
.take_while(|(i, _)| *i <= self.cursor.index)
.last()
.map(|(i, c)| {
i..(i + c.len())
});
if let Some(range) = range_opt {
self.cursor.index = range.start;
// Get text after deleted EGC
let after = line.split_off(range.end);
// Delete EGC
line.split_off(range.start);
// Add text after deleted EGC
line.append(after);
}
} else if self.cursor.line + 1 < self.buffer.lines.len() {
let old_line = self.buffer.lines.remove(self.cursor.line + 1);
self.buffer.lines[self.cursor.line].append(old_line);
}
},
Action::Click { x, y } => {
self.select_opt = None;
if let Some(new_cursor) = self.buffer.hit(x, y) {
if new_cursor != self.cursor {
self.cursor = new_cursor;
self.buffer.set_redraw(true);
}
}
},
Action::Drag { x, y } => {
if self.select_opt.is_none() {
self.select_opt = Some(self.cursor);
self.buffer.set_redraw(true);
}
if let Some(new_cursor) = self.buffer.hit(x, y) {
if new_cursor != self.cursor {
self.cursor = new_cursor;
self.buffer.set_redraw(true);
}
}
},
Action::Scroll { lines } => {
let mut scroll = self.buffer.scroll();
scroll += lines;
self.buffer.set_scroll(scroll);
}
}
if old_cursor != self.cursor {
self.cursor_moved = true;
/*TODO
if let Some(glyph) = run.glyphs.get(new_cursor_glyph) {
let font_opt = self.buffer.font_system().get_font(glyph.cache_key.font_id);
let text_glyph = &run.text[glyph.start..glyph.end];
log::debug!(
"{}, {}: '{}' ('{}'): '{}' ({:?})",
self.cursor.line,
self.cursor.index,
font_opt.as_ref().map_or("?", |font| font.info.family.as_str()),
font_opt.as_ref().map_or("?", |font| font.info.post_script_name.as_str()),
text_glyph,
text_glyph
);
}
*/
}
}sourcepub fn font_system(&self) -> &'a FontSystem
pub fn font_system(&self) -> &'a FontSystem
Get FontSystem used by this Buffer
sourcepub fn line_shape(&mut self, line_i: usize) -> Option<&ShapeLine>
pub fn line_shape(&mut self, line_i: usize) -> Option<&ShapeLine>
Shape the provided line index and return the result
sourcepub fn line_layout(&mut self, line_i: usize) -> Option<&[LayoutLine]>
pub fn line_layout(&mut self, line_i: usize) -> Option<&[LayoutLine]>
Lay out the provided line index and return the result
Examples found in repository?
src/edit/editor.rs (line 34)
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fn set_layout_cursor(&mut self, cursor: LayoutCursor) {
let layout = self.buffer.line_layout(cursor.line).expect("layout not found");
let layout_line = match layout.get(cursor.layout) {
Some(some) => some,
None => match layout.last() {
Some(some) => some,
None => todo!("layout cursor in line with no layouts"),
}
};
let new_index = match layout_line.glyphs.get(cursor.glyph) {
Some(glyph) => glyph.start,
None => match layout_line.glyphs.last() {
Some(glyph) => glyph.end,
//TODO: is this correct?
None => 0,
}
};
if self.cursor.line != cursor.line || self.cursor.index != new_index {
self.cursor.line = cursor.line;
self.cursor.index = new_index;
self.buffer.set_redraw(true);
}
}
}
impl<'a> Edit<'a> for Editor<'a> {
fn buffer(&self) -> &Buffer<'a> {
&self.buffer
}
fn buffer_mut(&mut self) -> &mut Buffer<'a> {
&mut self.buffer
}
fn cursor(&self) -> Cursor {
self.cursor
}
fn select_opt(&self) -> Option<Cursor> {
self.select_opt
}
fn set_select_opt(&mut self, select_opt: Option<Cursor>) {
if self.select_opt != select_opt {
self.select_opt = select_opt;
self.buffer.set_redraw(true);
}
}
fn shape_as_needed(&mut self) {
if self.cursor_moved {
self.buffer.shape_until_cursor(self.cursor);
self.cursor_moved = false;
} else {
self.buffer.shape_until_scroll();
}
}
fn copy_selection(&mut self) -> Option<String> {
let select = self.select_opt?;
let (start, end) = match select.line.cmp(&self.cursor.line) {
cmp::Ordering::Greater => (self.cursor, select),
cmp::Ordering::Less => (select, self.cursor),
cmp::Ordering::Equal => {
/* select.line == self.cursor.line */
if select.index < self.cursor.index {
(select, self.cursor)
} else {
/* select.index >= self.cursor.index */
(self.cursor, select)
}
}
};
let mut selection = String::new();
// Take the selection from the first line
{
// Add selected part of line to string
if start.line == end.line {
selection.push_str(&self.buffer.lines[start.line].text()[start.index..end.index]);
} else {
selection.push_str(&self.buffer.lines[start.line].text()[start.index..]);
selection.push('\n');
}
}
// Take the selection from all interior lines (if they exist)
for line_i in start.line + 1..end.line {
selection.push_str(self.buffer.lines[line_i].text());
selection.push('\n');
}
// Take the selection from the last line
if end.line > start.line {
// Add selected part of line to string
selection.push_str(&self.buffer.lines[end.line].text()[..end.index]);
}
Some(selection)
}
fn delete_selection(&mut self) -> bool {
let select = match self.select_opt.take() {
Some(some) => some,
None => return false,
};
let (start, end) = match select.line.cmp(&self.cursor.line) {
cmp::Ordering::Greater => (self.cursor, select),
cmp::Ordering::Less => (select, self.cursor),
cmp::Ordering::Equal => {
/* select.line == self.cursor.line */
if select.index < self.cursor.index {
(select, self.cursor)
} else {
/* select.index >= self.cursor.index */
(self.cursor, select)
}
}
};
// Reset cursor to start of selection
self.cursor = start;
// Delete the selection from the last line
let end_line_opt = if end.line > start.line {
// Get part of line after selection
let after = self.buffer.lines[end.line].split_off(end.index);
// Remove end line
self.buffer.lines.remove(end.line);
Some(after)
} else {
None
};
// Delete interior lines (in reverse for safety)
for line_i in (start.line + 1..end.line).rev() {
self.buffer.lines.remove(line_i);
}
// Delete the selection from the first line
{
// Get part after selection if start line is also end line
let after_opt = if start.line == end.line {
Some(self.buffer.lines[start.line].split_off(end.index))
} else {
None
};
// Delete selected part of line
self.buffer.lines[start.line].split_off(start.index);
// Re-add part of line after selection
if let Some(after) = after_opt {
self.buffer.lines[start.line].append(after);
}
// Re-add valid parts of end line
if let Some(end_line) = end_line_opt {
self.buffer.lines[start.line].append(end_line);
}
}
true
}
fn action(&mut self, action: Action) {
let old_cursor = self.cursor;
match action {
Action::Previous => {
let line = &mut self.buffer.lines[self.cursor.line];
if self.cursor.index > 0 {
// Find previous character index
let mut prev_index = 0;
for (i, _) in line.text().grapheme_indices(true) {
if i < self.cursor.index {
prev_index = i;
} else {
break;
}
}
self.cursor.index = prev_index;
self.buffer.set_redraw(true);
} else if self.cursor.line > 0 {
self.cursor.line -= 1;
self.cursor.index = self.buffer.lines[self.cursor.line].text().len();
self.buffer.set_redraw(true);
}
self.cursor_x_opt = None;
},
Action::Next => {
let line = &mut self.buffer.lines[self.cursor.line];
if self.cursor.index < line.text().len() {
for (i, c) in line.text().grapheme_indices(true) {
if i == self.cursor.index {
self.cursor.index += c.len();
self.buffer.set_redraw(true);
break;
}
}
} else if self.cursor.line + 1 < self.buffer.lines.len() {
self.cursor.line += 1;
self.cursor.index = 0;
self.buffer.set_redraw(true);
}
self.cursor_x_opt = None;
},
Action::Left => {
let rtl_opt = self.buffer.lines[self.cursor.line].shape_opt().as_ref().map(|shape| shape.rtl);
if let Some(rtl) = rtl_opt {
if rtl {
self.action(Action::Next);
} else {
self.action(Action::Previous);
}
}
},
Action::Right => {
let rtl_opt = self.buffer.lines[self.cursor.line].shape_opt().as_ref().map(|shape| shape.rtl);
if let Some(rtl) = rtl_opt {
if rtl {
self.action(Action::Previous);
} else {
self.action(Action::Next);
}
}
},
Action::Up => {
//TODO: make this preserve X as best as possible!
let mut cursor = self.buffer.layout_cursor(&self.cursor);
if self.cursor_x_opt.is_none() {
self.cursor_x_opt = Some(
cursor.glyph as i32 //TODO: glyph x position
);
}
if cursor.layout > 0 {
cursor.layout -= 1;
} else if cursor.line > 0 {
cursor.line -= 1;
cursor.layout = usize::max_value();
}
if let Some(cursor_x) = self.cursor_x_opt {
cursor.glyph = cursor_x as usize; //TODO: glyph x position
}
self.set_layout_cursor(cursor);
},
Action::Down => {
//TODO: make this preserve X as best as possible!
let mut cursor = self.buffer.layout_cursor(&self.cursor);
let layout_len = self.buffer.line_layout(cursor.line).expect("layout not found").len();
if self.cursor_x_opt.is_none() {
self.cursor_x_opt = Some(
cursor.glyph as i32 //TODO: glyph x position
);
}
if cursor.layout + 1 < layout_len {
cursor.layout += 1;
} else if cursor.line + 1 < self.buffer.lines.len() {
cursor.line += 1;
cursor.layout = 0;
}
if let Some(cursor_x) = self.cursor_x_opt {
cursor.glyph = cursor_x as usize; //TODO: glyph x position
}
self.set_layout_cursor(cursor);
},
Action::Home => {
let mut cursor = self.buffer.layout_cursor(&self.cursor);
cursor.glyph = 0;
self.set_layout_cursor(cursor);
self.cursor_x_opt = None;
},
Action::End => {
let mut cursor = self.buffer.layout_cursor(&self.cursor);
cursor.glyph = usize::max_value();
self.set_layout_cursor(cursor);
self.cursor_x_opt = None;
}
Action::PageUp => {
//TODO: move cursor
let mut scroll = self.buffer.scroll();
scroll -= self.buffer.visible_lines();
self.buffer.set_scroll(scroll);
},
Action::PageDown => {
//TODO: move cursor
let mut scroll = self.buffer.scroll();
scroll += self.buffer.visible_lines();
self.buffer.set_scroll(scroll);
},
Action::Escape => {
if self.select_opt.take().is_some() {
self.buffer.set_redraw(true);
}
},
Action::Insert(character) => {
if character.is_control()
&& !['\t', '\u{92}'].contains(&character)
{
// Filter out special chars (except for tab), use Action instead
log::debug!("Refusing to insert control character {:?}", character);
} else {
self.delete_selection();
let line = &mut self.buffer.lines[self.cursor.line];
// Collect text after insertion as a line
let after = line.split_off(self.cursor.index);
// Append the inserted text
line.append(BufferLine::new(
character.to_string(),
AttrsList::new(line.attrs_list().defaults() /*TODO: provide attrs?*/)
));
// Append the text after insertion
line.append(after);
self.cursor.index += character.len_utf8();
}
},
Action::Enter => {
self.delete_selection();
let new_line = self.buffer.lines[self.cursor.line].split_off(self.cursor.index);
self.cursor.line += 1;
self.cursor.index = 0;
self.buffer.lines.insert(self.cursor.line, new_line);
},
Action::Backspace => {
if self.delete_selection() {
// Deleted selection
} else if self.cursor.index > 0 {
let line = &mut self.buffer.lines[self.cursor.line];
// Get text line after cursor
let after = line.split_off(self.cursor.index);
// Find previous character index
let mut prev_index = 0;
for (i, _) in line.text().char_indices() {
if i < self.cursor.index {
prev_index = i;
} else {
break;
}
}
self.cursor.index = prev_index;
// Remove character
line.split_off(self.cursor.index);
// Add text after cursor
line.append(after);
} else if self.cursor.line > 0 {
let mut line_index = self.cursor.line;
let old_line = self.buffer.lines.remove(line_index);
line_index -= 1;
let line = &mut self.buffer.lines[line_index];
self.cursor.line = line_index;
self.cursor.index = line.text().len();
line.append(old_line);
}
},
Action::Delete => {
if self.delete_selection() {
// Deleted selection
} else if self.cursor.index < self.buffer.lines[self.cursor.line].text().len() {
let line = &mut self.buffer.lines[self.cursor.line];
let range_opt = line
.text()
.grapheme_indices(true)
.take_while(|(i, _)| *i <= self.cursor.index)
.last()
.map(|(i, c)| {
i..(i + c.len())
});
if let Some(range) = range_opt {
self.cursor.index = range.start;
// Get text after deleted EGC
let after = line.split_off(range.end);
// Delete EGC
line.split_off(range.start);
// Add text after deleted EGC
line.append(after);
}
} else if self.cursor.line + 1 < self.buffer.lines.len() {
let old_line = self.buffer.lines.remove(self.cursor.line + 1);
self.buffer.lines[self.cursor.line].append(old_line);
}
},
Action::Click { x, y } => {
self.select_opt = None;
if let Some(new_cursor) = self.buffer.hit(x, y) {
if new_cursor != self.cursor {
self.cursor = new_cursor;
self.buffer.set_redraw(true);
}
}
},
Action::Drag { x, y } => {
if self.select_opt.is_none() {
self.select_opt = Some(self.cursor);
self.buffer.set_redraw(true);
}
if let Some(new_cursor) = self.buffer.hit(x, y) {
if new_cursor != self.cursor {
self.cursor = new_cursor;
self.buffer.set_redraw(true);
}
}
},
Action::Scroll { lines } => {
let mut scroll = self.buffer.scroll();
scroll += lines;
self.buffer.set_scroll(scroll);
}
}
if old_cursor != self.cursor {
self.cursor_moved = true;
/*TODO
if let Some(glyph) = run.glyphs.get(new_cursor_glyph) {
let font_opt = self.buffer.font_system().get_font(glyph.cache_key.font_id);
let text_glyph = &run.text[glyph.start..glyph.end];
log::debug!(
"{}, {}: '{}' ('{}'): '{}' ({:?})",
self.cursor.line,
self.cursor.index,
font_opt.as_ref().map_or("?", |font| font.info.family.as_str()),
font_opt.as_ref().map_or("?", |font| font.info.post_script_name.as_str()),
text_glyph,
text_glyph
);
}
*/
}
}sourcepub fn metrics(&self) -> Metrics
pub fn metrics(&self) -> Metrics
Get the current Metrics
Examples found in repository?
src/edit/editor.rs (line 508)
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fn draw<F>(&self, cache: &mut crate::SwashCache, color: Color, mut f: F)
where F: FnMut(i32, i32, u32, u32, Color)
{
let font_size = self.buffer.metrics().font_size;
let line_height = self.buffer.metrics().line_height;
for run in self.buffer.layout_runs() {
let line_i = run.line_i;
let line_y = run.line_y;
let cursor_glyph_opt = |cursor: &Cursor| -> Option<(usize, f32)> {
if cursor.line == line_i {
for (glyph_i, glyph) in run.glyphs.iter().enumerate() {
if cursor.index == glyph.start {
return Some((glyph_i, 0.0));
} else if cursor.index > glyph.start && cursor.index < glyph.end {
// Guess x offset based on characters
let mut before = 0;
let mut total = 0;
let cluster = &run.text[glyph.start..glyph.end];
for (i, _) in cluster.grapheme_indices(true) {
if glyph.start + i < cursor.index {
before += 1;
}
total += 1;
}
let offset = glyph.w * (before as f32) / (total as f32);
return Some((glyph_i, offset));
}
}
match run.glyphs.last() {
Some(glyph) => {
if cursor.index == glyph.end {
return Some((run.glyphs.len(), 0.0));
}
},
None => {
return Some((0, 0.0));
}
}
}
None
};
// Highlight selection (TODO: HIGHLIGHT COLOR!)
if let Some(select) = self.select_opt {
let (start, end) = match select.line.cmp(&self.cursor.line) {
cmp::Ordering::Greater => (self.cursor, select),
cmp::Ordering::Less => (select, self.cursor),
cmp::Ordering::Equal => {
/* select.line == self.cursor.line */
if select.index < self.cursor.index {
(select, self.cursor)
} else {
/* select.index >= self.cursor.index */
(self.cursor, select)
}
}
};
if line_i >= start.line && line_i <= end.line {
let mut range_opt = None;
for glyph in run.glyphs.iter() {
// Guess x offset based on characters
let cluster = &run.text[glyph.start..glyph.end];
let total = cluster.grapheme_indices(true).count();
let mut c_x = glyph.x;
let c_w = glyph.w / total as f32;
for (i, c) in cluster.grapheme_indices(true) {
let c_start = glyph.start + i;
let c_end = glyph.start + i + c.len();
if (start.line != line_i || c_end > start.index)
&& (end.line != line_i || c_start < end.index) {
range_opt = match range_opt.take() {
Some((min, max)) => Some((
cmp::min(min, c_x as i32),
cmp::max(max, (c_x + c_w) as i32),
)),
None => Some((
c_x as i32,
(c_x + c_w) as i32,
))
};
} else if let Some((min, max)) = range_opt.take() {
f(
min,
line_y - font_size,
cmp::max(0, max - min) as u32,
line_height as u32,
Color::rgba(color.r(), color.g(), color.b(), 0x33)
);
}
c_x += c_w;
}
}
if run.glyphs.is_empty() && end.line > line_i{
// Highlight all of internal empty lines
range_opt = Some((0, self.buffer.size().0));
}
if let Some((mut min, mut max)) = range_opt.take() {
if end.line > line_i {
// Draw to end of line
if run.rtl {
min = 0;
} else {
max = self.buffer.size().0;
}
}
f(
min,
line_y - font_size,
cmp::max(0, max - min) as u32,
line_height as u32,
Color::rgba(color.r(), color.g(), color.b(), 0x33)
);
}
}
}
// Draw cursor
if let Some((cursor_glyph, cursor_glyph_offset)) = cursor_glyph_opt(&self.cursor) {
let x = match run.glyphs.get(cursor_glyph) {
Some(glyph) => {
// Start of detected glyph
if glyph.level.is_rtl() {
(glyph.x + glyph.w - cursor_glyph_offset) as i32
} else {
(glyph.x + cursor_glyph_offset) as i32
}
},
None => match run.glyphs.last() {
Some(glyph) => {
// End of last glyph
if glyph.level.is_rtl() {
glyph.x as i32
} else {
(glyph.x + glyph.w) as i32
}
},
None => {
// Start of empty line
0
}
}
};
f(
x,
line_y - font_size,
1,
line_height as u32,
color,
);
}
for glyph in run.glyphs.iter() {
let (cache_key, x_int, y_int) = (glyph.cache_key, glyph.x_int, glyph.y_int);
let glyph_color = match glyph.color_opt {
Some(some) => some,
None => color,
};
cache.with_pixels(cache_key, glyph_color, |x, y, color| {
f(x_int + x, line_y + y_int + y, 1, 1, color);
});
}
}
}sourcepub fn set_metrics(&mut self, metrics: Metrics)
pub fn set_metrics(&mut self, metrics: Metrics)
Set the current Metrics
sourcepub fn size(&self) -> (i32, i32)
pub fn size(&self) -> (i32, i32)
Get the current buffer dimensions (width, height)
Examples found in repository?
src/edit/editor.rs (line 605)
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fn draw<F>(&self, cache: &mut crate::SwashCache, color: Color, mut f: F)
where F: FnMut(i32, i32, u32, u32, Color)
{
let font_size = self.buffer.metrics().font_size;
let line_height = self.buffer.metrics().line_height;
for run in self.buffer.layout_runs() {
let line_i = run.line_i;
let line_y = run.line_y;
let cursor_glyph_opt = |cursor: &Cursor| -> Option<(usize, f32)> {
if cursor.line == line_i {
for (glyph_i, glyph) in run.glyphs.iter().enumerate() {
if cursor.index == glyph.start {
return Some((glyph_i, 0.0));
} else if cursor.index > glyph.start && cursor.index < glyph.end {
// Guess x offset based on characters
let mut before = 0;
let mut total = 0;
let cluster = &run.text[glyph.start..glyph.end];
for (i, _) in cluster.grapheme_indices(true) {
if glyph.start + i < cursor.index {
before += 1;
}
total += 1;
}
let offset = glyph.w * (before as f32) / (total as f32);
return Some((glyph_i, offset));
}
}
match run.glyphs.last() {
Some(glyph) => {
if cursor.index == glyph.end {
return Some((run.glyphs.len(), 0.0));
}
},
None => {
return Some((0, 0.0));
}
}
}
None
};
// Highlight selection (TODO: HIGHLIGHT COLOR!)
if let Some(select) = self.select_opt {
let (start, end) = match select.line.cmp(&self.cursor.line) {
cmp::Ordering::Greater => (self.cursor, select),
cmp::Ordering::Less => (select, self.cursor),
cmp::Ordering::Equal => {
/* select.line == self.cursor.line */
if select.index < self.cursor.index {
(select, self.cursor)
} else {
/* select.index >= self.cursor.index */
(self.cursor, select)
}
}
};
if line_i >= start.line && line_i <= end.line {
let mut range_opt = None;
for glyph in run.glyphs.iter() {
// Guess x offset based on characters
let cluster = &run.text[glyph.start..glyph.end];
let total = cluster.grapheme_indices(true).count();
let mut c_x = glyph.x;
let c_w = glyph.w / total as f32;
for (i, c) in cluster.grapheme_indices(true) {
let c_start = glyph.start + i;
let c_end = glyph.start + i + c.len();
if (start.line != line_i || c_end > start.index)
&& (end.line != line_i || c_start < end.index) {
range_opt = match range_opt.take() {
Some((min, max)) => Some((
cmp::min(min, c_x as i32),
cmp::max(max, (c_x + c_w) as i32),
)),
None => Some((
c_x as i32,
(c_x + c_w) as i32,
))
};
} else if let Some((min, max)) = range_opt.take() {
f(
min,
line_y - font_size,
cmp::max(0, max - min) as u32,
line_height as u32,
Color::rgba(color.r(), color.g(), color.b(), 0x33)
);
}
c_x += c_w;
}
}
if run.glyphs.is_empty() && end.line > line_i{
// Highlight all of internal empty lines
range_opt = Some((0, self.buffer.size().0));
}
if let Some((mut min, mut max)) = range_opt.take() {
if end.line > line_i {
// Draw to end of line
if run.rtl {
min = 0;
} else {
max = self.buffer.size().0;
}
}
f(
min,
line_y - font_size,
cmp::max(0, max - min) as u32,
line_height as u32,
Color::rgba(color.r(), color.g(), color.b(), 0x33)
);
}
}
}
// Draw cursor
if let Some((cursor_glyph, cursor_glyph_offset)) = cursor_glyph_opt(&self.cursor) {
let x = match run.glyphs.get(cursor_glyph) {
Some(glyph) => {
// Start of detected glyph
if glyph.level.is_rtl() {
(glyph.x + glyph.w - cursor_glyph_offset) as i32
} else {
(glyph.x + cursor_glyph_offset) as i32
}
},
None => match run.glyphs.last() {
Some(glyph) => {
// End of last glyph
if glyph.level.is_rtl() {
glyph.x as i32
} else {
(glyph.x + glyph.w) as i32
}
},
None => {
// Start of empty line
0
}
}
};
f(
x,
line_y - font_size,
1,
line_height as u32,
color,
);
}
for glyph in run.glyphs.iter() {
let (cache_key, x_int, y_int) = (glyph.cache_key, glyph.x_int, glyph.y_int);
let glyph_color = match glyph.color_opt {
Some(some) => some,
None => color,
};
cache.with_pixels(cache_key, glyph_color, |x, y, color| {
f(x_int + x, line_y + y_int + y, 1, 1, color);
});
}
}
}sourcepub fn scroll(&self) -> i32
pub fn scroll(&self) -> i32
Get the current scroll location
Examples found in repository?
src/edit/editor.rs (line 330)
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fn action(&mut self, action: Action) {
let old_cursor = self.cursor;
match action {
Action::Previous => {
let line = &mut self.buffer.lines[self.cursor.line];
if self.cursor.index > 0 {
// Find previous character index
let mut prev_index = 0;
for (i, _) in line.text().grapheme_indices(true) {
if i < self.cursor.index {
prev_index = i;
} else {
break;
}
}
self.cursor.index = prev_index;
self.buffer.set_redraw(true);
} else if self.cursor.line > 0 {
self.cursor.line -= 1;
self.cursor.index = self.buffer.lines[self.cursor.line].text().len();
self.buffer.set_redraw(true);
}
self.cursor_x_opt = None;
},
Action::Next => {
let line = &mut self.buffer.lines[self.cursor.line];
if self.cursor.index < line.text().len() {
for (i, c) in line.text().grapheme_indices(true) {
if i == self.cursor.index {
self.cursor.index += c.len();
self.buffer.set_redraw(true);
break;
}
}
} else if self.cursor.line + 1 < self.buffer.lines.len() {
self.cursor.line += 1;
self.cursor.index = 0;
self.buffer.set_redraw(true);
}
self.cursor_x_opt = None;
},
Action::Left => {
let rtl_opt = self.buffer.lines[self.cursor.line].shape_opt().as_ref().map(|shape| shape.rtl);
if let Some(rtl) = rtl_opt {
if rtl {
self.action(Action::Next);
} else {
self.action(Action::Previous);
}
}
},
Action::Right => {
let rtl_opt = self.buffer.lines[self.cursor.line].shape_opt().as_ref().map(|shape| shape.rtl);
if let Some(rtl) = rtl_opt {
if rtl {
self.action(Action::Previous);
} else {
self.action(Action::Next);
}
}
},
Action::Up => {
//TODO: make this preserve X as best as possible!
let mut cursor = self.buffer.layout_cursor(&self.cursor);
if self.cursor_x_opt.is_none() {
self.cursor_x_opt = Some(
cursor.glyph as i32 //TODO: glyph x position
);
}
if cursor.layout > 0 {
cursor.layout -= 1;
} else if cursor.line > 0 {
cursor.line -= 1;
cursor.layout = usize::max_value();
}
if let Some(cursor_x) = self.cursor_x_opt {
cursor.glyph = cursor_x as usize; //TODO: glyph x position
}
self.set_layout_cursor(cursor);
},
Action::Down => {
//TODO: make this preserve X as best as possible!
let mut cursor = self.buffer.layout_cursor(&self.cursor);
let layout_len = self.buffer.line_layout(cursor.line).expect("layout not found").len();
if self.cursor_x_opt.is_none() {
self.cursor_x_opt = Some(
cursor.glyph as i32 //TODO: glyph x position
);
}
if cursor.layout + 1 < layout_len {
cursor.layout += 1;
} else if cursor.line + 1 < self.buffer.lines.len() {
cursor.line += 1;
cursor.layout = 0;
}
if let Some(cursor_x) = self.cursor_x_opt {
cursor.glyph = cursor_x as usize; //TODO: glyph x position
}
self.set_layout_cursor(cursor);
},
Action::Home => {
let mut cursor = self.buffer.layout_cursor(&self.cursor);
cursor.glyph = 0;
self.set_layout_cursor(cursor);
self.cursor_x_opt = None;
},
Action::End => {
let mut cursor = self.buffer.layout_cursor(&self.cursor);
cursor.glyph = usize::max_value();
self.set_layout_cursor(cursor);
self.cursor_x_opt = None;
}
Action::PageUp => {
//TODO: move cursor
let mut scroll = self.buffer.scroll();
scroll -= self.buffer.visible_lines();
self.buffer.set_scroll(scroll);
},
Action::PageDown => {
//TODO: move cursor
let mut scroll = self.buffer.scroll();
scroll += self.buffer.visible_lines();
self.buffer.set_scroll(scroll);
},
Action::Escape => {
if self.select_opt.take().is_some() {
self.buffer.set_redraw(true);
}
},
Action::Insert(character) => {
if character.is_control()
&& !['\t', '\u{92}'].contains(&character)
{
// Filter out special chars (except for tab), use Action instead
log::debug!("Refusing to insert control character {:?}", character);
} else {
self.delete_selection();
let line = &mut self.buffer.lines[self.cursor.line];
// Collect text after insertion as a line
let after = line.split_off(self.cursor.index);
// Append the inserted text
line.append(BufferLine::new(
character.to_string(),
AttrsList::new(line.attrs_list().defaults() /*TODO: provide attrs?*/)
));
// Append the text after insertion
line.append(after);
self.cursor.index += character.len_utf8();
}
},
Action::Enter => {
self.delete_selection();
let new_line = self.buffer.lines[self.cursor.line].split_off(self.cursor.index);
self.cursor.line += 1;
self.cursor.index = 0;
self.buffer.lines.insert(self.cursor.line, new_line);
},
Action::Backspace => {
if self.delete_selection() {
// Deleted selection
} else if self.cursor.index > 0 {
let line = &mut self.buffer.lines[self.cursor.line];
// Get text line after cursor
let after = line.split_off(self.cursor.index);
// Find previous character index
let mut prev_index = 0;
for (i, _) in line.text().char_indices() {
if i < self.cursor.index {
prev_index = i;
} else {
break;
}
}
self.cursor.index = prev_index;
// Remove character
line.split_off(self.cursor.index);
// Add text after cursor
line.append(after);
} else if self.cursor.line > 0 {
let mut line_index = self.cursor.line;
let old_line = self.buffer.lines.remove(line_index);
line_index -= 1;
let line = &mut self.buffer.lines[line_index];
self.cursor.line = line_index;
self.cursor.index = line.text().len();
line.append(old_line);
}
},
Action::Delete => {
if self.delete_selection() {
// Deleted selection
} else if self.cursor.index < self.buffer.lines[self.cursor.line].text().len() {
let line = &mut self.buffer.lines[self.cursor.line];
let range_opt = line
.text()
.grapheme_indices(true)
.take_while(|(i, _)| *i <= self.cursor.index)
.last()
.map(|(i, c)| {
i..(i + c.len())
});
if let Some(range) = range_opt {
self.cursor.index = range.start;
// Get text after deleted EGC
let after = line.split_off(range.end);
// Delete EGC
line.split_off(range.start);
// Add text after deleted EGC
line.append(after);
}
} else if self.cursor.line + 1 < self.buffer.lines.len() {
let old_line = self.buffer.lines.remove(self.cursor.line + 1);
self.buffer.lines[self.cursor.line].append(old_line);
}
},
Action::Click { x, y } => {
self.select_opt = None;
if let Some(new_cursor) = self.buffer.hit(x, y) {
if new_cursor != self.cursor {
self.cursor = new_cursor;
self.buffer.set_redraw(true);
}
}
},
Action::Drag { x, y } => {
if self.select_opt.is_none() {
self.select_opt = Some(self.cursor);
self.buffer.set_redraw(true);
}
if let Some(new_cursor) = self.buffer.hit(x, y) {
if new_cursor != self.cursor {
self.cursor = new_cursor;
self.buffer.set_redraw(true);
}
}
},
Action::Scroll { lines } => {
let mut scroll = self.buffer.scroll();
scroll += lines;
self.buffer.set_scroll(scroll);
}
}
if old_cursor != self.cursor {
self.cursor_moved = true;
/*TODO
if let Some(glyph) = run.glyphs.get(new_cursor_glyph) {
let font_opt = self.buffer.font_system().get_font(glyph.cache_key.font_id);
let text_glyph = &run.text[glyph.start..glyph.end];
log::debug!(
"{}, {}: '{}' ('{}'): '{}' ({:?})",
self.cursor.line,
self.cursor.index,
font_opt.as_ref().map_or("?", |font| font.info.family.as_str()),
font_opt.as_ref().map_or("?", |font| font.info.post_script_name.as_str()),
text_glyph,
text_glyph
);
}
*/
}
}sourcepub fn set_scroll(&mut self, scroll: i32)
pub fn set_scroll(&mut self, scroll: i32)
Set the current scroll location
Examples found in repository?
src/edit/editor.rs (line 332)
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fn action(&mut self, action: Action) {
let old_cursor = self.cursor;
match action {
Action::Previous => {
let line = &mut self.buffer.lines[self.cursor.line];
if self.cursor.index > 0 {
// Find previous character index
let mut prev_index = 0;
for (i, _) in line.text().grapheme_indices(true) {
if i < self.cursor.index {
prev_index = i;
} else {
break;
}
}
self.cursor.index = prev_index;
self.buffer.set_redraw(true);
} else if self.cursor.line > 0 {
self.cursor.line -= 1;
self.cursor.index = self.buffer.lines[self.cursor.line].text().len();
self.buffer.set_redraw(true);
}
self.cursor_x_opt = None;
},
Action::Next => {
let line = &mut self.buffer.lines[self.cursor.line];
if self.cursor.index < line.text().len() {
for (i, c) in line.text().grapheme_indices(true) {
if i == self.cursor.index {
self.cursor.index += c.len();
self.buffer.set_redraw(true);
break;
}
}
} else if self.cursor.line + 1 < self.buffer.lines.len() {
self.cursor.line += 1;
self.cursor.index = 0;
self.buffer.set_redraw(true);
}
self.cursor_x_opt = None;
},
Action::Left => {
let rtl_opt = self.buffer.lines[self.cursor.line].shape_opt().as_ref().map(|shape| shape.rtl);
if let Some(rtl) = rtl_opt {
if rtl {
self.action(Action::Next);
} else {
self.action(Action::Previous);
}
}
},
Action::Right => {
let rtl_opt = self.buffer.lines[self.cursor.line].shape_opt().as_ref().map(|shape| shape.rtl);
if let Some(rtl) = rtl_opt {
if rtl {
self.action(Action::Previous);
} else {
self.action(Action::Next);
}
}
},
Action::Up => {
//TODO: make this preserve X as best as possible!
let mut cursor = self.buffer.layout_cursor(&self.cursor);
if self.cursor_x_opt.is_none() {
self.cursor_x_opt = Some(
cursor.glyph as i32 //TODO: glyph x position
);
}
if cursor.layout > 0 {
cursor.layout -= 1;
} else if cursor.line > 0 {
cursor.line -= 1;
cursor.layout = usize::max_value();
}
if let Some(cursor_x) = self.cursor_x_opt {
cursor.glyph = cursor_x as usize; //TODO: glyph x position
}
self.set_layout_cursor(cursor);
},
Action::Down => {
//TODO: make this preserve X as best as possible!
let mut cursor = self.buffer.layout_cursor(&self.cursor);
let layout_len = self.buffer.line_layout(cursor.line).expect("layout not found").len();
if self.cursor_x_opt.is_none() {
self.cursor_x_opt = Some(
cursor.glyph as i32 //TODO: glyph x position
);
}
if cursor.layout + 1 < layout_len {
cursor.layout += 1;
} else if cursor.line + 1 < self.buffer.lines.len() {
cursor.line += 1;
cursor.layout = 0;
}
if let Some(cursor_x) = self.cursor_x_opt {
cursor.glyph = cursor_x as usize; //TODO: glyph x position
}
self.set_layout_cursor(cursor);
},
Action::Home => {
let mut cursor = self.buffer.layout_cursor(&self.cursor);
cursor.glyph = 0;
self.set_layout_cursor(cursor);
self.cursor_x_opt = None;
},
Action::End => {
let mut cursor = self.buffer.layout_cursor(&self.cursor);
cursor.glyph = usize::max_value();
self.set_layout_cursor(cursor);
self.cursor_x_opt = None;
}
Action::PageUp => {
//TODO: move cursor
let mut scroll = self.buffer.scroll();
scroll -= self.buffer.visible_lines();
self.buffer.set_scroll(scroll);
},
Action::PageDown => {
//TODO: move cursor
let mut scroll = self.buffer.scroll();
scroll += self.buffer.visible_lines();
self.buffer.set_scroll(scroll);
},
Action::Escape => {
if self.select_opt.take().is_some() {
self.buffer.set_redraw(true);
}
},
Action::Insert(character) => {
if character.is_control()
&& !['\t', '\u{92}'].contains(&character)
{
// Filter out special chars (except for tab), use Action instead
log::debug!("Refusing to insert control character {:?}", character);
} else {
self.delete_selection();
let line = &mut self.buffer.lines[self.cursor.line];
// Collect text after insertion as a line
let after = line.split_off(self.cursor.index);
// Append the inserted text
line.append(BufferLine::new(
character.to_string(),
AttrsList::new(line.attrs_list().defaults() /*TODO: provide attrs?*/)
));
// Append the text after insertion
line.append(after);
self.cursor.index += character.len_utf8();
}
},
Action::Enter => {
self.delete_selection();
let new_line = self.buffer.lines[self.cursor.line].split_off(self.cursor.index);
self.cursor.line += 1;
self.cursor.index = 0;
self.buffer.lines.insert(self.cursor.line, new_line);
},
Action::Backspace => {
if self.delete_selection() {
// Deleted selection
} else if self.cursor.index > 0 {
let line = &mut self.buffer.lines[self.cursor.line];
// Get text line after cursor
let after = line.split_off(self.cursor.index);
// Find previous character index
let mut prev_index = 0;
for (i, _) in line.text().char_indices() {
if i < self.cursor.index {
prev_index = i;
} else {
break;
}
}
self.cursor.index = prev_index;
// Remove character
line.split_off(self.cursor.index);
// Add text after cursor
line.append(after);
} else if self.cursor.line > 0 {
let mut line_index = self.cursor.line;
let old_line = self.buffer.lines.remove(line_index);
line_index -= 1;
let line = &mut self.buffer.lines[line_index];
self.cursor.line = line_index;
self.cursor.index = line.text().len();
line.append(old_line);
}
},
Action::Delete => {
if self.delete_selection() {
// Deleted selection
} else if self.cursor.index < self.buffer.lines[self.cursor.line].text().len() {
let line = &mut self.buffer.lines[self.cursor.line];
let range_opt = line
.text()
.grapheme_indices(true)
.take_while(|(i, _)| *i <= self.cursor.index)
.last()
.map(|(i, c)| {
i..(i + c.len())
});
if let Some(range) = range_opt {
self.cursor.index = range.start;
// Get text after deleted EGC
let after = line.split_off(range.end);
// Delete EGC
line.split_off(range.start);
// Add text after deleted EGC
line.append(after);
}
} else if self.cursor.line + 1 < self.buffer.lines.len() {
let old_line = self.buffer.lines.remove(self.cursor.line + 1);
self.buffer.lines[self.cursor.line].append(old_line);
}
},
Action::Click { x, y } => {
self.select_opt = None;
if let Some(new_cursor) = self.buffer.hit(x, y) {
if new_cursor != self.cursor {
self.cursor = new_cursor;
self.buffer.set_redraw(true);
}
}
},
Action::Drag { x, y } => {
if self.select_opt.is_none() {
self.select_opt = Some(self.cursor);
self.buffer.set_redraw(true);
}
if let Some(new_cursor) = self.buffer.hit(x, y) {
if new_cursor != self.cursor {
self.cursor = new_cursor;
self.buffer.set_redraw(true);
}
}
},
Action::Scroll { lines } => {
let mut scroll = self.buffer.scroll();
scroll += lines;
self.buffer.set_scroll(scroll);
}
}
if old_cursor != self.cursor {
self.cursor_moved = true;
/*TODO
if let Some(glyph) = run.glyphs.get(new_cursor_glyph) {
let font_opt = self.buffer.font_system().get_font(glyph.cache_key.font_id);
let text_glyph = &run.text[glyph.start..glyph.end];
log::debug!(
"{}, {}: '{}' ('{}'): '{}' ({:?})",
self.cursor.line,
self.cursor.index,
font_opt.as_ref().map_or("?", |font| font.info.family.as_str()),
font_opt.as_ref().map_or("?", |font| font.info.post_script_name.as_str()),
text_glyph,
text_glyph
);
}
*/
}
}sourcepub fn visible_lines(&self) -> i32
pub fn visible_lines(&self) -> i32
Get the number of lines that can be viewed in the buffer
Examples found in repository?
src/buffer.rs (line 269)
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pub fn shape_until_cursor(&mut self, cursor: Cursor) {
#[cfg(feature = "std")]
let instant = std::time::Instant::now();
let mut reshaped = 0;
let mut layout_i = 0;
for (line_i, line) in self.lines.iter_mut().enumerate() {
if line_i > cursor.line {
break;
}
if line.shape_opt().is_none() {
reshaped += 1;
}
let layout = line.layout(
self.font_system,
self.metrics.font_size,
self.width
);
if line_i == cursor.line {
let layout_cursor = self.layout_cursor(&cursor);
layout_i += layout_cursor.layout as i32;
break;
} else {
layout_i += layout.len() as i32;
}
}
if reshaped > 0 {
#[cfg(feature = "std")]
log::debug!("shape_until_cursor {}: {:?}", reshaped, instant.elapsed());
self.redraw = true;
}
let lines = self.visible_lines();
if layout_i < self.scroll {
self.scroll = layout_i;
} else if layout_i >= self.scroll + lines {
self.scroll = layout_i - (lines - 1);
}
self.shape_until_scroll();
}
/// Shape lines until scroll
pub fn shape_until_scroll(&mut self) {
let lines = self.visible_lines();
let scroll_end = self.scroll + lines;
let total_layout = self.shape_until(scroll_end);
self.scroll = cmp::max(
0,
cmp::min(
total_layout - (lines - 1),
self.scroll,
),
);
}More examples
src/edit/editor.rs (line 331)
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fn action(&mut self, action: Action) {
let old_cursor = self.cursor;
match action {
Action::Previous => {
let line = &mut self.buffer.lines[self.cursor.line];
if self.cursor.index > 0 {
// Find previous character index
let mut prev_index = 0;
for (i, _) in line.text().grapheme_indices(true) {
if i < self.cursor.index {
prev_index = i;
} else {
break;
}
}
self.cursor.index = prev_index;
self.buffer.set_redraw(true);
} else if self.cursor.line > 0 {
self.cursor.line -= 1;
self.cursor.index = self.buffer.lines[self.cursor.line].text().len();
self.buffer.set_redraw(true);
}
self.cursor_x_opt = None;
},
Action::Next => {
let line = &mut self.buffer.lines[self.cursor.line];
if self.cursor.index < line.text().len() {
for (i, c) in line.text().grapheme_indices(true) {
if i == self.cursor.index {
self.cursor.index += c.len();
self.buffer.set_redraw(true);
break;
}
}
} else if self.cursor.line + 1 < self.buffer.lines.len() {
self.cursor.line += 1;
self.cursor.index = 0;
self.buffer.set_redraw(true);
}
self.cursor_x_opt = None;
},
Action::Left => {
let rtl_opt = self.buffer.lines[self.cursor.line].shape_opt().as_ref().map(|shape| shape.rtl);
if let Some(rtl) = rtl_opt {
if rtl {
self.action(Action::Next);
} else {
self.action(Action::Previous);
}
}
},
Action::Right => {
let rtl_opt = self.buffer.lines[self.cursor.line].shape_opt().as_ref().map(|shape| shape.rtl);
if let Some(rtl) = rtl_opt {
if rtl {
self.action(Action::Previous);
} else {
self.action(Action::Next);
}
}
},
Action::Up => {
//TODO: make this preserve X as best as possible!
let mut cursor = self.buffer.layout_cursor(&self.cursor);
if self.cursor_x_opt.is_none() {
self.cursor_x_opt = Some(
cursor.glyph as i32 //TODO: glyph x position
);
}
if cursor.layout > 0 {
cursor.layout -= 1;
} else if cursor.line > 0 {
cursor.line -= 1;
cursor.layout = usize::max_value();
}
if let Some(cursor_x) = self.cursor_x_opt {
cursor.glyph = cursor_x as usize; //TODO: glyph x position
}
self.set_layout_cursor(cursor);
},
Action::Down => {
//TODO: make this preserve X as best as possible!
let mut cursor = self.buffer.layout_cursor(&self.cursor);
let layout_len = self.buffer.line_layout(cursor.line).expect("layout not found").len();
if self.cursor_x_opt.is_none() {
self.cursor_x_opt = Some(
cursor.glyph as i32 //TODO: glyph x position
);
}
if cursor.layout + 1 < layout_len {
cursor.layout += 1;
} else if cursor.line + 1 < self.buffer.lines.len() {
cursor.line += 1;
cursor.layout = 0;
}
if let Some(cursor_x) = self.cursor_x_opt {
cursor.glyph = cursor_x as usize; //TODO: glyph x position
}
self.set_layout_cursor(cursor);
},
Action::Home => {
let mut cursor = self.buffer.layout_cursor(&self.cursor);
cursor.glyph = 0;
self.set_layout_cursor(cursor);
self.cursor_x_opt = None;
},
Action::End => {
let mut cursor = self.buffer.layout_cursor(&self.cursor);
cursor.glyph = usize::max_value();
self.set_layout_cursor(cursor);
self.cursor_x_opt = None;
}
Action::PageUp => {
//TODO: move cursor
let mut scroll = self.buffer.scroll();
scroll -= self.buffer.visible_lines();
self.buffer.set_scroll(scroll);
},
Action::PageDown => {
//TODO: move cursor
let mut scroll = self.buffer.scroll();
scroll += self.buffer.visible_lines();
self.buffer.set_scroll(scroll);
},
Action::Escape => {
if self.select_opt.take().is_some() {
self.buffer.set_redraw(true);
}
},
Action::Insert(character) => {
if character.is_control()
&& !['\t', '\u{92}'].contains(&character)
{
// Filter out special chars (except for tab), use Action instead
log::debug!("Refusing to insert control character {:?}", character);
} else {
self.delete_selection();
let line = &mut self.buffer.lines[self.cursor.line];
// Collect text after insertion as a line
let after = line.split_off(self.cursor.index);
// Append the inserted text
line.append(BufferLine::new(
character.to_string(),
AttrsList::new(line.attrs_list().defaults() /*TODO: provide attrs?*/)
));
// Append the text after insertion
line.append(after);
self.cursor.index += character.len_utf8();
}
},
Action::Enter => {
self.delete_selection();
let new_line = self.buffer.lines[self.cursor.line].split_off(self.cursor.index);
self.cursor.line += 1;
self.cursor.index = 0;
self.buffer.lines.insert(self.cursor.line, new_line);
},
Action::Backspace => {
if self.delete_selection() {
// Deleted selection
} else if self.cursor.index > 0 {
let line = &mut self.buffer.lines[self.cursor.line];
// Get text line after cursor
let after = line.split_off(self.cursor.index);
// Find previous character index
let mut prev_index = 0;
for (i, _) in line.text().char_indices() {
if i < self.cursor.index {
prev_index = i;
} else {
break;
}
}
self.cursor.index = prev_index;
// Remove character
line.split_off(self.cursor.index);
// Add text after cursor
line.append(after);
} else if self.cursor.line > 0 {
let mut line_index = self.cursor.line;
let old_line = self.buffer.lines.remove(line_index);
line_index -= 1;
let line = &mut self.buffer.lines[line_index];
self.cursor.line = line_index;
self.cursor.index = line.text().len();
line.append(old_line);
}
},
Action::Delete => {
if self.delete_selection() {
// Deleted selection
} else if self.cursor.index < self.buffer.lines[self.cursor.line].text().len() {
let line = &mut self.buffer.lines[self.cursor.line];
let range_opt = line
.text()
.grapheme_indices(true)
.take_while(|(i, _)| *i <= self.cursor.index)
.last()
.map(|(i, c)| {
i..(i + c.len())
});
if let Some(range) = range_opt {
self.cursor.index = range.start;
// Get text after deleted EGC
let after = line.split_off(range.end);
// Delete EGC
line.split_off(range.start);
// Add text after deleted EGC
line.append(after);
}
} else if self.cursor.line + 1 < self.buffer.lines.len() {
let old_line = self.buffer.lines.remove(self.cursor.line + 1);
self.buffer.lines[self.cursor.line].append(old_line);
}
},
Action::Click { x, y } => {
self.select_opt = None;
if let Some(new_cursor) = self.buffer.hit(x, y) {
if new_cursor != self.cursor {
self.cursor = new_cursor;
self.buffer.set_redraw(true);
}
}
},
Action::Drag { x, y } => {
if self.select_opt.is_none() {
self.select_opt = Some(self.cursor);
self.buffer.set_redraw(true);
}
if let Some(new_cursor) = self.buffer.hit(x, y) {
if new_cursor != self.cursor {
self.cursor = new_cursor;
self.buffer.set_redraw(true);
}
}
},
Action::Scroll { lines } => {
let mut scroll = self.buffer.scroll();
scroll += lines;
self.buffer.set_scroll(scroll);
}
}
if old_cursor != self.cursor {
self.cursor_moved = true;
/*TODO
if let Some(glyph) = run.glyphs.get(new_cursor_glyph) {
let font_opt = self.buffer.font_system().get_font(glyph.cache_key.font_id);
let text_glyph = &run.text[glyph.start..glyph.end];
log::debug!(
"{}, {}: '{}' ('{}'): '{}' ({:?})",
self.cursor.line,
self.cursor.index,
font_opt.as_ref().map_or("?", |font| font.info.family.as_str()),
font_opt.as_ref().map_or("?", |font| font.info.post_script_name.as_str()),
text_glyph,
text_glyph
);
}
*/
}
}sourcepub fn set_text(&mut self, text: &str, attrs: Attrs<'a>)
pub fn set_text(&mut self, text: &str, attrs: Attrs<'a>)
Set text of buffer, using provided attributes for each line by default
Examples found in repository?
src/buffer.rs (line 177)
164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179
pub fn new(
font_system: &'a FontSystem,
metrics: Metrics,
) -> Self {
let mut buffer = Self {
font_system,
lines: Vec::new(),
metrics,
width: 0,
height: 0,
scroll: 0,
redraw: false,
};
buffer.set_text("", Attrs::new());
buffer
}sourcepub fn set_redraw(&mut self, redraw: bool)
pub fn set_redraw(&mut self, redraw: bool)
Set redraw needed flag
Examples found in repository?
src/edit/editor.rs (line 56)
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fn set_layout_cursor(&mut self, cursor: LayoutCursor) {
let layout = self.buffer.line_layout(cursor.line).expect("layout not found");
let layout_line = match layout.get(cursor.layout) {
Some(some) => some,
None => match layout.last() {
Some(some) => some,
None => todo!("layout cursor in line with no layouts"),
}
};
let new_index = match layout_line.glyphs.get(cursor.glyph) {
Some(glyph) => glyph.start,
None => match layout_line.glyphs.last() {
Some(glyph) => glyph.end,
//TODO: is this correct?
None => 0,
}
};
if self.cursor.line != cursor.line || self.cursor.index != new_index {
self.cursor.line = cursor.line;
self.cursor.index = new_index;
self.buffer.set_redraw(true);
}
}
}
impl<'a> Edit<'a> for Editor<'a> {
fn buffer(&self) -> &Buffer<'a> {
&self.buffer
}
fn buffer_mut(&mut self) -> &mut Buffer<'a> {
&mut self.buffer
}
fn cursor(&self) -> Cursor {
self.cursor
}
fn select_opt(&self) -> Option<Cursor> {
self.select_opt
}
fn set_select_opt(&mut self, select_opt: Option<Cursor>) {
if self.select_opt != select_opt {
self.select_opt = select_opt;
self.buffer.set_redraw(true);
}
}
fn shape_as_needed(&mut self) {
if self.cursor_moved {
self.buffer.shape_until_cursor(self.cursor);
self.cursor_moved = false;
} else {
self.buffer.shape_until_scroll();
}
}
fn copy_selection(&mut self) -> Option<String> {
let select = self.select_opt?;
let (start, end) = match select.line.cmp(&self.cursor.line) {
cmp::Ordering::Greater => (self.cursor, select),
cmp::Ordering::Less => (select, self.cursor),
cmp::Ordering::Equal => {
/* select.line == self.cursor.line */
if select.index < self.cursor.index {
(select, self.cursor)
} else {
/* select.index >= self.cursor.index */
(self.cursor, select)
}
}
};
let mut selection = String::new();
// Take the selection from the first line
{
// Add selected part of line to string
if start.line == end.line {
selection.push_str(&self.buffer.lines[start.line].text()[start.index..end.index]);
} else {
selection.push_str(&self.buffer.lines[start.line].text()[start.index..]);
selection.push('\n');
}
}
// Take the selection from all interior lines (if they exist)
for line_i in start.line + 1..end.line {
selection.push_str(self.buffer.lines[line_i].text());
selection.push('\n');
}
// Take the selection from the last line
if end.line > start.line {
// Add selected part of line to string
selection.push_str(&self.buffer.lines[end.line].text()[..end.index]);
}
Some(selection)
}
fn delete_selection(&mut self) -> bool {
let select = match self.select_opt.take() {
Some(some) => some,
None => return false,
};
let (start, end) = match select.line.cmp(&self.cursor.line) {
cmp::Ordering::Greater => (self.cursor, select),
cmp::Ordering::Less => (select, self.cursor),
cmp::Ordering::Equal => {
/* select.line == self.cursor.line */
if select.index < self.cursor.index {
(select, self.cursor)
} else {
/* select.index >= self.cursor.index */
(self.cursor, select)
}
}
};
// Reset cursor to start of selection
self.cursor = start;
// Delete the selection from the last line
let end_line_opt = if end.line > start.line {
// Get part of line after selection
let after = self.buffer.lines[end.line].split_off(end.index);
// Remove end line
self.buffer.lines.remove(end.line);
Some(after)
} else {
None
};
// Delete interior lines (in reverse for safety)
for line_i in (start.line + 1..end.line).rev() {
self.buffer.lines.remove(line_i);
}
// Delete the selection from the first line
{
// Get part after selection if start line is also end line
let after_opt = if start.line == end.line {
Some(self.buffer.lines[start.line].split_off(end.index))
} else {
None
};
// Delete selected part of line
self.buffer.lines[start.line].split_off(start.index);
// Re-add part of line after selection
if let Some(after) = after_opt {
self.buffer.lines[start.line].append(after);
}
// Re-add valid parts of end line
if let Some(end_line) = end_line_opt {
self.buffer.lines[start.line].append(end_line);
}
}
true
}
fn action(&mut self, action: Action) {
let old_cursor = self.cursor;
match action {
Action::Previous => {
let line = &mut self.buffer.lines[self.cursor.line];
if self.cursor.index > 0 {
// Find previous character index
let mut prev_index = 0;
for (i, _) in line.text().grapheme_indices(true) {
if i < self.cursor.index {
prev_index = i;
} else {
break;
}
}
self.cursor.index = prev_index;
self.buffer.set_redraw(true);
} else if self.cursor.line > 0 {
self.cursor.line -= 1;
self.cursor.index = self.buffer.lines[self.cursor.line].text().len();
self.buffer.set_redraw(true);
}
self.cursor_x_opt = None;
},
Action::Next => {
let line = &mut self.buffer.lines[self.cursor.line];
if self.cursor.index < line.text().len() {
for (i, c) in line.text().grapheme_indices(true) {
if i == self.cursor.index {
self.cursor.index += c.len();
self.buffer.set_redraw(true);
break;
}
}
} else if self.cursor.line + 1 < self.buffer.lines.len() {
self.cursor.line += 1;
self.cursor.index = 0;
self.buffer.set_redraw(true);
}
self.cursor_x_opt = None;
},
Action::Left => {
let rtl_opt = self.buffer.lines[self.cursor.line].shape_opt().as_ref().map(|shape| shape.rtl);
if let Some(rtl) = rtl_opt {
if rtl {
self.action(Action::Next);
} else {
self.action(Action::Previous);
}
}
},
Action::Right => {
let rtl_opt = self.buffer.lines[self.cursor.line].shape_opt().as_ref().map(|shape| shape.rtl);
if let Some(rtl) = rtl_opt {
if rtl {
self.action(Action::Previous);
} else {
self.action(Action::Next);
}
}
},
Action::Up => {
//TODO: make this preserve X as best as possible!
let mut cursor = self.buffer.layout_cursor(&self.cursor);
if self.cursor_x_opt.is_none() {
self.cursor_x_opt = Some(
cursor.glyph as i32 //TODO: glyph x position
);
}
if cursor.layout > 0 {
cursor.layout -= 1;
} else if cursor.line > 0 {
cursor.line -= 1;
cursor.layout = usize::max_value();
}
if let Some(cursor_x) = self.cursor_x_opt {
cursor.glyph = cursor_x as usize; //TODO: glyph x position
}
self.set_layout_cursor(cursor);
},
Action::Down => {
//TODO: make this preserve X as best as possible!
let mut cursor = self.buffer.layout_cursor(&self.cursor);
let layout_len = self.buffer.line_layout(cursor.line).expect("layout not found").len();
if self.cursor_x_opt.is_none() {
self.cursor_x_opt = Some(
cursor.glyph as i32 //TODO: glyph x position
);
}
if cursor.layout + 1 < layout_len {
cursor.layout += 1;
} else if cursor.line + 1 < self.buffer.lines.len() {
cursor.line += 1;
cursor.layout = 0;
}
if let Some(cursor_x) = self.cursor_x_opt {
cursor.glyph = cursor_x as usize; //TODO: glyph x position
}
self.set_layout_cursor(cursor);
},
Action::Home => {
let mut cursor = self.buffer.layout_cursor(&self.cursor);
cursor.glyph = 0;
self.set_layout_cursor(cursor);
self.cursor_x_opt = None;
},
Action::End => {
let mut cursor = self.buffer.layout_cursor(&self.cursor);
cursor.glyph = usize::max_value();
self.set_layout_cursor(cursor);
self.cursor_x_opt = None;
}
Action::PageUp => {
//TODO: move cursor
let mut scroll = self.buffer.scroll();
scroll -= self.buffer.visible_lines();
self.buffer.set_scroll(scroll);
},
Action::PageDown => {
//TODO: move cursor
let mut scroll = self.buffer.scroll();
scroll += self.buffer.visible_lines();
self.buffer.set_scroll(scroll);
},
Action::Escape => {
if self.select_opt.take().is_some() {
self.buffer.set_redraw(true);
}
},
Action::Insert(character) => {
if character.is_control()
&& !['\t', '\u{92}'].contains(&character)
{
// Filter out special chars (except for tab), use Action instead
log::debug!("Refusing to insert control character {:?}", character);
} else {
self.delete_selection();
let line = &mut self.buffer.lines[self.cursor.line];
// Collect text after insertion as a line
let after = line.split_off(self.cursor.index);
// Append the inserted text
line.append(BufferLine::new(
character.to_string(),
AttrsList::new(line.attrs_list().defaults() /*TODO: provide attrs?*/)
));
// Append the text after insertion
line.append(after);
self.cursor.index += character.len_utf8();
}
},
Action::Enter => {
self.delete_selection();
let new_line = self.buffer.lines[self.cursor.line].split_off(self.cursor.index);
self.cursor.line += 1;
self.cursor.index = 0;
self.buffer.lines.insert(self.cursor.line, new_line);
},
Action::Backspace => {
if self.delete_selection() {
// Deleted selection
} else if self.cursor.index > 0 {
let line = &mut self.buffer.lines[self.cursor.line];
// Get text line after cursor
let after = line.split_off(self.cursor.index);
// Find previous character index
let mut prev_index = 0;
for (i, _) in line.text().char_indices() {
if i < self.cursor.index {
prev_index = i;
} else {
break;
}
}
self.cursor.index = prev_index;
// Remove character
line.split_off(self.cursor.index);
// Add text after cursor
line.append(after);
} else if self.cursor.line > 0 {
let mut line_index = self.cursor.line;
let old_line = self.buffer.lines.remove(line_index);
line_index -= 1;
let line = &mut self.buffer.lines[line_index];
self.cursor.line = line_index;
self.cursor.index = line.text().len();
line.append(old_line);
}
},
Action::Delete => {
if self.delete_selection() {
// Deleted selection
} else if self.cursor.index < self.buffer.lines[self.cursor.line].text().len() {
let line = &mut self.buffer.lines[self.cursor.line];
let range_opt = line
.text()
.grapheme_indices(true)
.take_while(|(i, _)| *i <= self.cursor.index)
.last()
.map(|(i, c)| {
i..(i + c.len())
});
if let Some(range) = range_opt {
self.cursor.index = range.start;
// Get text after deleted EGC
let after = line.split_off(range.end);
// Delete EGC
line.split_off(range.start);
// Add text after deleted EGC
line.append(after);
}
} else if self.cursor.line + 1 < self.buffer.lines.len() {
let old_line = self.buffer.lines.remove(self.cursor.line + 1);
self.buffer.lines[self.cursor.line].append(old_line);
}
},
Action::Click { x, y } => {
self.select_opt = None;
if let Some(new_cursor) = self.buffer.hit(x, y) {
if new_cursor != self.cursor {
self.cursor = new_cursor;
self.buffer.set_redraw(true);
}
}
},
Action::Drag { x, y } => {
if self.select_opt.is_none() {
self.select_opt = Some(self.cursor);
self.buffer.set_redraw(true);
}
if let Some(new_cursor) = self.buffer.hit(x, y) {
if new_cursor != self.cursor {
self.cursor = new_cursor;
self.buffer.set_redraw(true);
}
}
},
Action::Scroll { lines } => {
let mut scroll = self.buffer.scroll();
scroll += lines;
self.buffer.set_scroll(scroll);
}
}
if old_cursor != self.cursor {
self.cursor_moved = true;
/*TODO
if let Some(glyph) = run.glyphs.get(new_cursor_glyph) {
let font_opt = self.buffer.font_system().get_font(glyph.cache_key.font_id);
let text_glyph = &run.text[glyph.start..glyph.end];
log::debug!(
"{}, {}: '{}' ('{}'): '{}' ({:?})",
self.cursor.line,
self.cursor.index,
font_opt.as_ref().map_or("?", |font| font.info.family.as_str()),
font_opt.as_ref().map_or("?", |font| font.info.post_script_name.as_str()),
text_glyph,
text_glyph
);
}
*/
}
}sourcepub fn layout_runs<'b>(&'b self) -> LayoutRunIter<'a, 'b> ⓘ
pub fn layout_runs<'b>(&'b self) -> LayoutRunIter<'a, 'b> ⓘ
Get the visible layout runs for rendering and other tasks
Examples found in repository?
src/buffer.rs (line 444)
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pub fn hit(&self, x: i32, y: i32) -> Option<Cursor> {
#[cfg(feature = "std")]
let instant = std::time::Instant::now();
let font_size = self.metrics.font_size;
let line_height = self.metrics.line_height;
let mut new_cursor_opt = None;
let mut runs = self.layout_runs().peekable();
let mut first_run = true;
while let Some(run) = runs.next() {
let line_y = run.line_y;
if first_run && y < line_y - font_size {
first_run = false;
let new_cursor = Cursor::new(run.line_i, 0);
new_cursor_opt = Some(new_cursor);
} else if y >= line_y - font_size
&& y < line_y - font_size + line_height
{
let mut new_cursor_glyph = run.glyphs.len();
let mut new_cursor_char = 0;
let mut first_glyph = true;
'hit: for (glyph_i, glyph) in run.glyphs.iter().enumerate() {
if first_glyph {
first_glyph = false;
if (run.rtl && x > glyph.x as i32) || (!run.rtl && x < 0) {
new_cursor_glyph = 0;
new_cursor_char = 0;
}
}
if x >= glyph.x as i32
&& x <= (glyph.x + glyph.w) as i32
{
new_cursor_glyph = glyph_i;
let cluster = &run.text[glyph.start..glyph.end];
let total = cluster.grapheme_indices(true).count();
let mut egc_x = glyph.x;
let egc_w = glyph.w / (total as f32);
for (egc_i, egc) in cluster.grapheme_indices(true) {
if x >= egc_x as i32
&& x <= (egc_x + egc_w) as i32
{
new_cursor_char = egc_i;
let right_half = x >= (egc_x + egc_w / 2.0) as i32;
if right_half != glyph.level.is_rtl() {
// If clicking on last half of glyph, move cursor past glyph
new_cursor_char += egc.len();
}
break 'hit;
}
egc_x += egc_w;
}
let right_half = x >= (glyph.x + glyph.w / 2.0) as i32;
if right_half != glyph.level.is_rtl() {
// If clicking on last half of glyph, move cursor past glyph
new_cursor_char = cluster.len();
}
break 'hit;
}
}
let mut new_cursor = Cursor::new(run.line_i, 0);
match run.glyphs.get(new_cursor_glyph) {
Some(glyph) => {
// Position at glyph
new_cursor.index = glyph.start + new_cursor_char;
},
None => if let Some(glyph) = run.glyphs.last() {
// Position at end of line
new_cursor.index = glyph.end;
},
}
new_cursor_opt = Some(new_cursor);
break;
} else if runs.peek().is_none() && y > run.line_y {
let mut new_cursor = Cursor::new(run.line_i, 0);
if let Some(glyph) = run.glyphs.last() {
new_cursor.index = glyph.end;
}
new_cursor_opt = Some(new_cursor);
}
}
#[cfg(feature = "std")]
log::trace!("click({}, {}): {:?}", x, y, instant.elapsed());
new_cursor_opt
}
/// Draw the buffer
#[cfg(feature = "swash")]
pub fn draw<F>(&self, cache: &mut crate::SwashCache, color: Color, mut f: F)
where F: FnMut(i32, i32, u32, u32, Color)
{
for run in self.layout_runs() {
for glyph in run.glyphs.iter() {
let (cache_key, x_int, y_int) = (glyph.cache_key, glyph.x_int, glyph.y_int);
let glyph_color = match glyph.color_opt {
Some(some) => some,
None => color,
};
cache.with_pixels(cache_key, glyph_color, |x, y, color| {
f(x_int + x, run.line_y + y_int + y, 1, 1, color);
});
}
}
}More examples
src/edit/editor.rs (line 511)
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fn draw<F>(&self, cache: &mut crate::SwashCache, color: Color, mut f: F)
where F: FnMut(i32, i32, u32, u32, Color)
{
let font_size = self.buffer.metrics().font_size;
let line_height = self.buffer.metrics().line_height;
for run in self.buffer.layout_runs() {
let line_i = run.line_i;
let line_y = run.line_y;
let cursor_glyph_opt = |cursor: &Cursor| -> Option<(usize, f32)> {
if cursor.line == line_i {
for (glyph_i, glyph) in run.glyphs.iter().enumerate() {
if cursor.index == glyph.start {
return Some((glyph_i, 0.0));
} else if cursor.index > glyph.start && cursor.index < glyph.end {
// Guess x offset based on characters
let mut before = 0;
let mut total = 0;
let cluster = &run.text[glyph.start..glyph.end];
for (i, _) in cluster.grapheme_indices(true) {
if glyph.start + i < cursor.index {
before += 1;
}
total += 1;
}
let offset = glyph.w * (before as f32) / (total as f32);
return Some((glyph_i, offset));
}
}
match run.glyphs.last() {
Some(glyph) => {
if cursor.index == glyph.end {
return Some((run.glyphs.len(), 0.0));
}
},
None => {
return Some((0, 0.0));
}
}
}
None
};
// Highlight selection (TODO: HIGHLIGHT COLOR!)
if let Some(select) = self.select_opt {
let (start, end) = match select.line.cmp(&self.cursor.line) {
cmp::Ordering::Greater => (self.cursor, select),
cmp::Ordering::Less => (select, self.cursor),
cmp::Ordering::Equal => {
/* select.line == self.cursor.line */
if select.index < self.cursor.index {
(select, self.cursor)
} else {
/* select.index >= self.cursor.index */
(self.cursor, select)
}
}
};
if line_i >= start.line && line_i <= end.line {
let mut range_opt = None;
for glyph in run.glyphs.iter() {
// Guess x offset based on characters
let cluster = &run.text[glyph.start..glyph.end];
let total = cluster.grapheme_indices(true).count();
let mut c_x = glyph.x;
let c_w = glyph.w / total as f32;
for (i, c) in cluster.grapheme_indices(true) {
let c_start = glyph.start + i;
let c_end = glyph.start + i + c.len();
if (start.line != line_i || c_end > start.index)
&& (end.line != line_i || c_start < end.index) {
range_opt = match range_opt.take() {
Some((min, max)) => Some((
cmp::min(min, c_x as i32),
cmp::max(max, (c_x + c_w) as i32),
)),
None => Some((
c_x as i32,
(c_x + c_w) as i32,
))
};
} else if let Some((min, max)) = range_opt.take() {
f(
min,
line_y - font_size,
cmp::max(0, max - min) as u32,
line_height as u32,
Color::rgba(color.r(), color.g(), color.b(), 0x33)
);
}
c_x += c_w;
}
}
if run.glyphs.is_empty() && end.line > line_i{
// Highlight all of internal empty lines
range_opt = Some((0, self.buffer.size().0));
}
if let Some((mut min, mut max)) = range_opt.take() {
if end.line > line_i {
// Draw to end of line
if run.rtl {
min = 0;
} else {
max = self.buffer.size().0;
}
}
f(
min,
line_y - font_size,
cmp::max(0, max - min) as u32,
line_height as u32,
Color::rgba(color.r(), color.g(), color.b(), 0x33)
);
}
}
}
// Draw cursor
if let Some((cursor_glyph, cursor_glyph_offset)) = cursor_glyph_opt(&self.cursor) {
let x = match run.glyphs.get(cursor_glyph) {
Some(glyph) => {
// Start of detected glyph
if glyph.level.is_rtl() {
(glyph.x + glyph.w - cursor_glyph_offset) as i32
} else {
(glyph.x + cursor_glyph_offset) as i32
}
},
None => match run.glyphs.last() {
Some(glyph) => {
// End of last glyph
if glyph.level.is_rtl() {
glyph.x as i32
} else {
(glyph.x + glyph.w) as i32
}
},
None => {
// Start of empty line
0
}
}
};
f(
x,
line_y - font_size,
1,
line_height as u32,
color,
);
}
for glyph in run.glyphs.iter() {
let (cache_key, x_int, y_int) = (glyph.cache_key, glyph.x_int, glyph.y_int);
let glyph_color = match glyph.color_opt {
Some(some) => some,
None => color,
};
cache.with_pixels(cache_key, glyph_color, |x, y, color| {
f(x_int + x, line_y + y_int + y, 1, 1, color);
});
}
}
}sourcepub fn hit(&self, x: i32, y: i32) -> Option<Cursor>
pub fn hit(&self, x: i32, y: i32) -> Option<Cursor>
Convert x, y position to Cursor (hit detection)
Examples found in repository?
src/edit/editor.rs (line 455)
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fn action(&mut self, action: Action) {
let old_cursor = self.cursor;
match action {
Action::Previous => {
let line = &mut self.buffer.lines[self.cursor.line];
if self.cursor.index > 0 {
// Find previous character index
let mut prev_index = 0;
for (i, _) in line.text().grapheme_indices(true) {
if i < self.cursor.index {
prev_index = i;
} else {
break;
}
}
self.cursor.index = prev_index;
self.buffer.set_redraw(true);
} else if self.cursor.line > 0 {
self.cursor.line -= 1;
self.cursor.index = self.buffer.lines[self.cursor.line].text().len();
self.buffer.set_redraw(true);
}
self.cursor_x_opt = None;
},
Action::Next => {
let line = &mut self.buffer.lines[self.cursor.line];
if self.cursor.index < line.text().len() {
for (i, c) in line.text().grapheme_indices(true) {
if i == self.cursor.index {
self.cursor.index += c.len();
self.buffer.set_redraw(true);
break;
}
}
} else if self.cursor.line + 1 < self.buffer.lines.len() {
self.cursor.line += 1;
self.cursor.index = 0;
self.buffer.set_redraw(true);
}
self.cursor_x_opt = None;
},
Action::Left => {
let rtl_opt = self.buffer.lines[self.cursor.line].shape_opt().as_ref().map(|shape| shape.rtl);
if let Some(rtl) = rtl_opt {
if rtl {
self.action(Action::Next);
} else {
self.action(Action::Previous);
}
}
},
Action::Right => {
let rtl_opt = self.buffer.lines[self.cursor.line].shape_opt().as_ref().map(|shape| shape.rtl);
if let Some(rtl) = rtl_opt {
if rtl {
self.action(Action::Previous);
} else {
self.action(Action::Next);
}
}
},
Action::Up => {
//TODO: make this preserve X as best as possible!
let mut cursor = self.buffer.layout_cursor(&self.cursor);
if self.cursor_x_opt.is_none() {
self.cursor_x_opt = Some(
cursor.glyph as i32 //TODO: glyph x position
);
}
if cursor.layout > 0 {
cursor.layout -= 1;
} else if cursor.line > 0 {
cursor.line -= 1;
cursor.layout = usize::max_value();
}
if let Some(cursor_x) = self.cursor_x_opt {
cursor.glyph = cursor_x as usize; //TODO: glyph x position
}
self.set_layout_cursor(cursor);
},
Action::Down => {
//TODO: make this preserve X as best as possible!
let mut cursor = self.buffer.layout_cursor(&self.cursor);
let layout_len = self.buffer.line_layout(cursor.line).expect("layout not found").len();
if self.cursor_x_opt.is_none() {
self.cursor_x_opt = Some(
cursor.glyph as i32 //TODO: glyph x position
);
}
if cursor.layout + 1 < layout_len {
cursor.layout += 1;
} else if cursor.line + 1 < self.buffer.lines.len() {
cursor.line += 1;
cursor.layout = 0;
}
if let Some(cursor_x) = self.cursor_x_opt {
cursor.glyph = cursor_x as usize; //TODO: glyph x position
}
self.set_layout_cursor(cursor);
},
Action::Home => {
let mut cursor = self.buffer.layout_cursor(&self.cursor);
cursor.glyph = 0;
self.set_layout_cursor(cursor);
self.cursor_x_opt = None;
},
Action::End => {
let mut cursor = self.buffer.layout_cursor(&self.cursor);
cursor.glyph = usize::max_value();
self.set_layout_cursor(cursor);
self.cursor_x_opt = None;
}
Action::PageUp => {
//TODO: move cursor
let mut scroll = self.buffer.scroll();
scroll -= self.buffer.visible_lines();
self.buffer.set_scroll(scroll);
},
Action::PageDown => {
//TODO: move cursor
let mut scroll = self.buffer.scroll();
scroll += self.buffer.visible_lines();
self.buffer.set_scroll(scroll);
},
Action::Escape => {
if self.select_opt.take().is_some() {
self.buffer.set_redraw(true);
}
},
Action::Insert(character) => {
if character.is_control()
&& !['\t', '\u{92}'].contains(&character)
{
// Filter out special chars (except for tab), use Action instead
log::debug!("Refusing to insert control character {:?}", character);
} else {
self.delete_selection();
let line = &mut self.buffer.lines[self.cursor.line];
// Collect text after insertion as a line
let after = line.split_off(self.cursor.index);
// Append the inserted text
line.append(BufferLine::new(
character.to_string(),
AttrsList::new(line.attrs_list().defaults() /*TODO: provide attrs?*/)
));
// Append the text after insertion
line.append(after);
self.cursor.index += character.len_utf8();
}
},
Action::Enter => {
self.delete_selection();
let new_line = self.buffer.lines[self.cursor.line].split_off(self.cursor.index);
self.cursor.line += 1;
self.cursor.index = 0;
self.buffer.lines.insert(self.cursor.line, new_line);
},
Action::Backspace => {
if self.delete_selection() {
// Deleted selection
} else if self.cursor.index > 0 {
let line = &mut self.buffer.lines[self.cursor.line];
// Get text line after cursor
let after = line.split_off(self.cursor.index);
// Find previous character index
let mut prev_index = 0;
for (i, _) in line.text().char_indices() {
if i < self.cursor.index {
prev_index = i;
} else {
break;
}
}
self.cursor.index = prev_index;
// Remove character
line.split_off(self.cursor.index);
// Add text after cursor
line.append(after);
} else if self.cursor.line > 0 {
let mut line_index = self.cursor.line;
let old_line = self.buffer.lines.remove(line_index);
line_index -= 1;
let line = &mut self.buffer.lines[line_index];
self.cursor.line = line_index;
self.cursor.index = line.text().len();
line.append(old_line);
}
},
Action::Delete => {
if self.delete_selection() {
// Deleted selection
} else if self.cursor.index < self.buffer.lines[self.cursor.line].text().len() {
let line = &mut self.buffer.lines[self.cursor.line];
let range_opt = line
.text()
.grapheme_indices(true)
.take_while(|(i, _)| *i <= self.cursor.index)
.last()
.map(|(i, c)| {
i..(i + c.len())
});
if let Some(range) = range_opt {
self.cursor.index = range.start;
// Get text after deleted EGC
let after = line.split_off(range.end);
// Delete EGC
line.split_off(range.start);
// Add text after deleted EGC
line.append(after);
}
} else if self.cursor.line + 1 < self.buffer.lines.len() {
let old_line = self.buffer.lines.remove(self.cursor.line + 1);
self.buffer.lines[self.cursor.line].append(old_line);
}
},
Action::Click { x, y } => {
self.select_opt = None;
if let Some(new_cursor) = self.buffer.hit(x, y) {
if new_cursor != self.cursor {
self.cursor = new_cursor;
self.buffer.set_redraw(true);
}
}
},
Action::Drag { x, y } => {
if self.select_opt.is_none() {
self.select_opt = Some(self.cursor);
self.buffer.set_redraw(true);
}
if let Some(new_cursor) = self.buffer.hit(x, y) {
if new_cursor != self.cursor {
self.cursor = new_cursor;
self.buffer.set_redraw(true);
}
}
},
Action::Scroll { lines } => {
let mut scroll = self.buffer.scroll();
scroll += lines;
self.buffer.set_scroll(scroll);
}
}
if old_cursor != self.cursor {
self.cursor_moved = true;
/*TODO
if let Some(glyph) = run.glyphs.get(new_cursor_glyph) {
let font_opt = self.buffer.font_system().get_font(glyph.cache_key.font_id);
let text_glyph = &run.text[glyph.start..glyph.end];
log::debug!(
"{}, {}: '{}' ('{}'): '{}' ({:?})",
self.cursor.line,
self.cursor.index,
font_opt.as_ref().map_or("?", |font| font.info.family.as_str()),
font_opt.as_ref().map_or("?", |font| font.info.post_script_name.as_str()),
text_glyph,
text_glyph
);
}
*/
}
}