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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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144
components/gfx/display_list/mod.rs
View file

@ -48,10 +48,74 @@ pub struct DisplayList {
}
impl DisplayList {
// Returns the text index within a node for the point of interest.
pub fn text_index(&self,
node: OpaqueNode,
client_point: &Point2D<Au>,
scroll_offsets: &ScrollOffsetMap)
-> Option<usize> {
let mut result = Vec::new();
let mut translated_point = client_point.clone();
let mut traversal = DisplayListTraversal::new(self);
self.text_index_contents(node,
&mut traversal,
&mut translated_point,
client_point,
scroll_offsets,
&mut result);
result.pop()
}
pub fn text_index_contents<'a>(&self,
node: OpaqueNode,
traversal: &mut DisplayListTraversal<'a>,
translated_point: &mut Point2D<Au>,
client_point: &Point2D<Au>,
scroll_offsets: &ScrollOffsetMap,
result: &mut Vec<usize>) {
while let Some(item) = traversal.next() {
match item {
&DisplayItem::PushStackingContext(ref stacking_context_item) => {
DisplayList::translate_point(&stacking_context_item.stacking_context,
translated_point,
client_point);
self.text_index_contents(node,
traversal,
translated_point,
client_point,
scroll_offsets,
result);
}
&DisplayItem::PushScrollRoot(ref item) => {
DisplayList::scroll_root(&item.scroll_root,
translated_point,
scroll_offsets);
self.text_index_contents(node,
traversal,
translated_point,
client_point,
scroll_offsets,
result);
},
&DisplayItem::PopStackingContext(_) => return,
&DisplayItem::Text(ref text) => {
let base = item.base();
if base.metadata.node == node {
let offset = *translated_point - text.baseline_origin;
let index = text.text_run.range_index_of_advance(&text.range, offset.x);
result.push(index);
}
},
_ => {},
}
}
}
// Return all nodes containing the point of interest, bottommost first, and
// respecting the `pointer-events` CSS property.
pub fn hit_test(&self,
translated_point: &Point2D<Au>,
translated_point: &mut Point2D<Au>,
client_point: &Point2D<Au>,
scroll_offsets: &ScrollOffsetMap)
-> Vec<DisplayItemMetadata> {
@ -67,27 +131,31 @@ impl DisplayList {
pub fn hit_test_contents<'a>(&self,
traversal: &mut DisplayListTraversal<'a>,
translated_point: &Point2D<Au>,
translated_point: &mut Point2D<Au>,
client_point: &Point2D<Au>,
scroll_offsets: &ScrollOffsetMap,
result: &mut Vec<DisplayItemMetadata>) {
while let Some(item) = traversal.next() {
match item {
&DisplayItem::PushStackingContext(ref stacking_context_item) => {
self.hit_test_stacking_context(traversal,
&stacking_context_item.stacking_context,
translated_point,
client_point,
scroll_offsets,
result);
DisplayList::translate_point(&stacking_context_item.stacking_context,
translated_point,
client_point);
self.hit_test_contents(traversal,
translated_point,
client_point,
scroll_offsets,
result);
}
&DisplayItem::PushScrollRoot(ref item) => {
self.hit_test_scroll_root(traversal,
&item.scroll_root,
*translated_point,
client_point,
scroll_offsets,
result);
DisplayList::scroll_root(&item.scroll_root,
translated_point,
scroll_offsets);
self.hit_test_contents(traversal,
translated_point,
client_point,
scroll_offsets,
result);
}
&DisplayItem::PopStackingContext(_) | &DisplayItem::PopScrollRoot(_) => return,
_ => {
@ -99,38 +167,15 @@ impl DisplayList {
}
}
fn hit_test_scroll_root<'a>(&self,
traversal: &mut DisplayListTraversal<'a>,
scroll_root: &ScrollRoot,
mut translated_point: Point2D<Au>,
client_point: &Point2D<Au>,
scroll_offsets: &ScrollOffsetMap,
result: &mut Vec<DisplayItemMetadata>) {
// Adjust the translated point to account for the scroll offset if
// necessary. This can only happen when WebRender is in use.
//
// We don't perform this adjustment on the root stacking context because
// the DOM-side code has already translated the point for us (e.g. in
// `Window::hit_test_query()`) by now.
if let Some(scroll_offset) = scroll_offsets.get(&scroll_root.id) {
translated_point.x -= Au::from_f32_px(scroll_offset.x);
translated_point.y -= Au::from_f32_px(scroll_offset.y);
}
self.hit_test_contents(traversal, &translated_point, client_point, scroll_offsets, result);
}
fn hit_test_stacking_context<'a>(&self,
traversal: &mut DisplayListTraversal<'a>,
stacking_context: &StackingContext,
translated_point: &Point2D<Au>,
client_point: &Point2D<Au>,
scroll_offsets: &ScrollOffsetMap,
result: &mut Vec<DisplayItemMetadata>) {
#[inline]
fn translate_point<'a>(stacking_context: &StackingContext,
translated_point: &mut Point2D<Au>,
client_point: &Point2D<Au>) {
// Convert the parent translated point into stacking context local transform space if the
// stacking context isn't fixed. If it's fixed, we need to use the client point anyway.
debug_assert!(stacking_context.context_type == StackingContextType::Real);
let is_fixed = stacking_context.scroll_policy == ScrollPolicy::Fixed;
let translated_point = if is_fixed {
*translated_point = if is_fixed {
*client_point
} else {
let point = *translated_point - stacking_context.bounds.origin;
@ -139,8 +184,21 @@ impl DisplayList {
point.y.to_f32_px()));
Point2D::new(Au::from_f32_px(frac_point.x), Au::from_f32_px(frac_point.y))
};
}
self.hit_test_contents(traversal, &translated_point, client_point, scroll_offsets, result);
#[inline]
fn scroll_root<'a>(scroll_root: &ScrollRoot,
translated_point: &mut Point2D<Au>,
scroll_offsets: &ScrollOffsetMap) {
// Adjust the translated point to account for the scroll offset if necessary.
//
// We don't perform this adjustment on the root stacking context because
// the DOM-side code has already translated the point for us (e.g. in
// `Window::hit_test_query()`) by now.
if let Some(scroll_offset) = scroll_offsets.get(&scroll_root.id) {
translated_point.x -= Au::from_f32_px(scroll_offset.x);
translated_point.y -= Au::from_f32_px(scroll_offset.y);
}
}
pub fn print(&self) {

21
components/gfx/text/glyph.rs
View file

@ -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() {

15
components/gfx/text/text_run.rs
View file

@ -304,6 +304,21 @@ impl<'a> TextRun {
})
}
/// Returns the index in the range of the first glyph advancing over given advance
pub fn range_index_of_advance(&self, range: &Range<ByteIndex>, advance: Au) -> usize {
// TODO(Issue #199): alter advance direction for RTL
// TODO(Issue #98): using inter-char and inter-word spacing settings when measuring text
let mut remaining = advance;
self.natural_word_slices_in_range(range)
.map(|slice| {
let (slice_index, slice_advance) =
slice.glyphs.range_index_of_advance(&slice.range, remaining, self.extra_word_spacing);
remaining -= slice_advance;
slice_index
})
.sum()
}
/// Returns an iterator that will iterate over all slices of glyphs that represent natural
/// words in the given range.
pub fn natural_word_slices_in_range(&'a self, range: &Range<ByteIndex>)