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Make hit detection public

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This commit is contained in:
Jeremy Soller 2022-10-25 20:27:46 -06:00
parent e32cfedfcf
commit c031944b45
1 changed files with 36 additions and 27 deletions
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63
src/buffer.rs
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@ -88,16 +88,16 @@ pub struct TextLayoutRun<'a> {
pub line_y: i32,
}
pub struct TextLayoutRunIter<'a> {
buffer: &'a TextBuffer<'a>,
pub struct TextLayoutRunIter<'a, 'b> {
buffer: &'b TextBuffer<'a>,
line_i: usize,
layout_i: usize,
line_y: i32,
total_layout: i32,
}
impl<'a> TextLayoutRunIter<'a> {
pub fn new(buffer: &'a TextBuffer<'a>) -> Self {
impl<'a, 'b> TextLayoutRunIter<'a, 'b> {
pub fn new(buffer: &'b TextBuffer<'a>) -> Self {
Self {
buffer,
line_i: 0,
@ -108,8 +108,8 @@ impl<'a> TextLayoutRunIter<'a> {
}
}
impl<'a> Iterator for TextLayoutRunIter<'a> {
type Item = TextLayoutRun<'a>;
impl<'a, 'b> Iterator for TextLayoutRunIter<'a, 'b> {
type Item = TextLayoutRun<'b>;
fn next(&mut self) -> Option<Self::Item> {
while let Some(line) = self.buffer.lines.get(self.line_i) {
@ -759,7 +759,12 @@ impl<'a> TextBuffer<'a> {
TextAction::Click { x, y } => {
self.select_opt = None;
self.click(x, y);
if let Some(new_cursor) = self.hit(x, y) {
if new_cursor != self.cursor {
self.cursor = new_cursor;
self.redraw = true;
}
}
},
TextAction::Drag { x, y } => {
if self.select_opt.is_none() {
@ -767,7 +772,12 @@ impl<'a> TextBuffer<'a> {
self.redraw = true;
}
self.click(x, y);
if let Some(new_cursor) = self.hit(x, y) {
if new_cursor != self.cursor {
self.cursor = new_cursor;
self.redraw = true;
}
}
},
TextAction::Scroll { lines } => {
self.scroll += lines;
@ -778,25 +788,26 @@ impl<'a> TextBuffer<'a> {
}
}
fn click(&mut self, mouse_x: i32, mouse_y: i32) {
/// Convert x, y position to TextCursor (hit detection)
pub fn hit(&self, x: i32, y: i32) -> Option<TextCursor> {
let instant = Instant::now();
let font_size = self.metrics.font_size;
let line_height = self.metrics.line_height;
let mut new_cursor = self.cursor;
let mut new_cursor_opt = None;
for run in self.layout_runs() {
let line_y = run.line_y;
if mouse_y >= line_y - font_size
&& mouse_y < line_y - font_size + line_height
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;
'hit: for (glyph_i, glyph) in run.glyphs.iter().enumerate() {
if mouse_x >= glyph.x as i32
&& mouse_x <= (glyph.x + glyph.w) as i32
if x >= glyph.x as i32
&& x <= (glyph.x + glyph.w) as i32
{
new_cursor_glyph = glyph_i;
@ -805,12 +816,12 @@ impl<'a> TextBuffer<'a> {
let mut egc_x = glyph.x;
let egc_w = glyph.w / (total as f32);
for (egc_i, egc) in cluster.grapheme_indices(true) {
if mouse_x >= egc_x as i32
&& mouse_x <= (egc_x + egc_w) as i32
if x >= egc_x as i32
&& x <= (egc_x + egc_w) as i32
{
new_cursor_char = egc_i;
let right_half = mouse_x >= (egc_x + egc_w / 2.0) as i32;
let right_half = x >= (egc_x + egc_w / 2.0) as i32;
if right_half != glyph.rtl {
// If clicking on last half of glyph, move cursor past glyph
new_cursor_char += egc.len();
@ -820,7 +831,7 @@ impl<'a> TextBuffer<'a> {
egc_x += egc_w;
}
let right_half = mouse_x >= (glyph.x + glyph.w / 2.0) as i32;
let right_half = x >= (glyph.x + glyph.w / 2.0) as i32;
if right_half != glyph.rtl {
// If clicking on last half of glyph, move cursor past glyph
new_cursor_char = cluster.len();
@ -829,8 +840,7 @@ impl<'a> TextBuffer<'a> {
}
}
new_cursor.line = run.line_i;
new_cursor.index = 0;
let mut new_cursor = TextCursor::new(run.line_i, 0);
match run.glyphs.get(new_cursor_glyph) {
Some(glyph) => {
@ -859,21 +869,20 @@ impl<'a> TextBuffer<'a> {
}
}
new_cursor_opt = Some(new_cursor);
break;
}
}
if new_cursor != self.cursor {
self.cursor = new_cursor;
self.redraw = true;
}
let duration = instant.elapsed();
log::trace!("click({}, {}): {:?}", mouse_x, mouse_y, duration);
log::trace!("click({}, {}): {:?}", x, y, duration);
new_cursor_opt
}
/// Get the visible layout runs for rendering and other tasks
pub fn layout_runs(&self) -> TextLayoutRunIter {
pub fn layout_runs<'b>(&'b self) -> TextLayoutRunIter<'a, 'b> {
TextLayoutRunIter::new(self)
}