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LibWeb: Calculate selection based on glyph centers

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Previously you had to drag all the way to the end of a glyph to select
it; now you just need to drag past the center.  Also fixes #2959.
This commit is contained in:
Rewi Haar 2020-08-26 11:31:11 +12:00 • committed by Andreas Kling
parent dd83f6a266
commit 521e730df1
2 changed files with 10 additions and 7 deletions
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11
Libraries/LibWeb/Layout/LineBoxFragment.cpp
View file

@ -91,11 +91,11 @@ int LineBoxFragment::text_index_at(float x) const
float width_so_far = 0;
for (auto it = view.begin(); it != view.end(); ++it) {
float glyph_width = font.glyph_or_emoji_width(*it);
if ((width_so_far + glyph_width + glyph_spacing) > relative_x)
if ((width_so_far + (glyph_width + glyph_spacing) / 2) > relative_x)
return m_start + view.byte_offset_of(it);
width_so_far += glyph_width + glyph_spacing;
}
return m_start + m_length - 1;
return m_start + m_length;
}
Gfx::FloatRect LineBoxFragment::selection_rect(const Gfx::Font& font) const
@ -116,6 +116,9 @@ Gfx::FloatRect LineBoxFragment::selection_rect(const Gfx::Font& font) const
const auto end_index = m_start + m_length;
auto text = this->text();
if (selection.start().index_in_node == selection.end().index_in_node)
return {};
if (layout_node().selection_state() == LayoutNode::SelectionState::StartAndEnd) {
// we are in the start/end node (both the same)
if (start_index > selection.end().index_in_node)
@ -124,7 +127,7 @@ Gfx::FloatRect LineBoxFragment::selection_rect(const Gfx::Font& font) const
return {};
auto selection_start_in_this_fragment = max(0, selection.start().index_in_node - m_start);
auto selection_end_in_this_fragment = min(m_length, selection.end().index_in_node - m_start + 1);
auto selection_end_in_this_fragment = min(m_length, selection.end().index_in_node - m_start);
auto pixel_distance_to_first_selected_character = font.width(text.substring_view(0, selection_start_in_this_fragment));
auto pixel_width_of_selection = font.width(text.substring_view(selection_start_in_this_fragment, selection_end_in_this_fragment - selection_start_in_this_fragment)) + 1;
@ -156,7 +159,7 @@ Gfx::FloatRect LineBoxFragment::selection_rect(const Gfx::Font& font) const
return {};
auto selection_start_in_this_fragment = 0;
auto selection_end_in_this_fragment = min(selection.end().index_in_node + 1, m_length);
auto selection_end_in_this_fragment = min(selection.end().index_in_node, m_length);
auto pixel_distance_to_first_selected_character = font.width(text.substring_view(0, selection_start_in_this_fragment));
auto pixel_width_of_selection = font.width(text.substring_view(selection_start_in_this_fragment, selection_end_in_this_fragment - selection_start_in_this_fragment)) + 1;