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Position insertion point in input field with mouse

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This commit is contained in:
Florian Merz 2017-01-11 09:04:03 +01:00
parent c784bc6944
commit b40db5b55d
9 changed files with 219 additions and 50 deletions
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21
components/gfx/text/glyph.rs
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@ -546,6 +546,27 @@ impl<'a> GlyphStore {
}
}
// Scan the glyphs for a given range until we reach a given advance. Returns the index
// and advance of the glyph in the range at the given advance, if reached. Otherwise, returns the
// the number of glyphs and the advance for the given range.
#[inline]
pub fn range_index_of_advance(&self, range: &Range<ByteIndex>, advance: Au, extra_word_spacing: Au) -> (usize, Au) {
let mut index = 0;
let mut current_advance = Au(0);
for glyph in self.iter_glyphs_for_byte_range(range) {
if glyph.char_is_space() {
current_advance += glyph.advance() + extra_word_spacing
} else {
current_advance += glyph.advance()
}
if current_advance > advance {
break;
}
index += 1;
}
(index, current_advance)
}
#[inline]
pub fn advance_for_byte_range(&self, range: &Range<ByteIndex>, extra_word_spacing: Au) -> Au {
if range.begin() == ByteIndex(0) && range.end() == self.len() {