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LibGUI: Skip over grapheme clusters on left/right arrow key presses

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Currently, if you use the left/right arrow keys to move over a multi-
code point glyph, we will move through that glyph one code point at a
time. This means you can "pause" your movement in the middle of a glyph
and delete a subsection of a grapheme cluster. This now moves the cursor
across the entire cluster.

Visually, we will need to separately track physical and virtual cursor
positions. That is, when you move across a multi-code point glyph, the
visual cursor should only move one position at a time, while a physical
cursor stores the "real" position in terms of number of code points.

This also converts a couple of ints to auto - these are actually size_t,
and are being passed to functions that expect size_t, so let's not cast
them to ints.
This commit is contained in:
Timothy Flynn 2023-02-17 09:40:46 -05:00 • committed by Andreas Kling
parent d0697d350d
commit 8a94c7a7f7
1 changed files with 8 additions and 6 deletions
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14
Userland/Libraries/LibGUI/EditingEngine.cpp
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@ -167,26 +167,28 @@ bool EditingEngine::on_key(KeyEvent const& event)
void EditingEngine::move_one_left() void EditingEngine::move_one_left()
{ {
if (m_editor->cursor().column() > 0) { if (m_editor->cursor().column() > 0) {
int new_column = m_editor->cursor().column() - 1; auto new_column = m_editor->document().get_previous_grapheme_cluster_boundary(m_editor->cursor());
m_editor->set_cursor(m_editor->cursor().line(), new_column); m_editor->set_cursor(m_editor->cursor().line(), new_column);
} else if (m_editor->cursor().line() > 0) { } else if (m_editor->cursor().line() > 0) {
int new_line = m_editor->cursor().line() - 1; auto new_line = m_editor->cursor().line() - 1;
int new_column = m_editor->lines()[new_line].length(); auto new_column = m_editor->lines()[new_line].length();
m_editor->set_cursor(new_line, new_column); m_editor->set_cursor(new_line, new_column);
} }
} }
void EditingEngine::move_one_right() void EditingEngine::move_one_right()
{ {
int new_line = m_editor->cursor().line(); auto new_line = m_editor->cursor().line();
int new_column = m_editor->cursor().column(); auto new_column = m_editor->cursor().column();
if (m_editor->cursor().column() < m_editor->current_line().length()) { if (m_editor->cursor().column() < m_editor->current_line().length()) {
new_line = m_editor->cursor().line(); new_line = m_editor->cursor().line();
new_column = m_editor->cursor().column() + 1; new_column = m_editor->document().get_next_grapheme_cluster_boundary(m_editor->cursor());
} else if (m_editor->cursor().line() != m_editor->line_count() - 1) { } else if (m_editor->cursor().line() != m_editor->line_count() - 1) {
new_line = m_editor->cursor().line() + 1; new_line = m_editor->cursor().line() + 1;
new_column = 0; new_column = 0;
} }
m_editor->set_cursor(new_line, new_column); m_editor->set_cursor(new_line, new_column);
} }