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LibGUI: Combine wrapping/non-wrapping TextEditor code paths

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The `is_wrapping_enabled()` paths function just fine when wrapping is
disabled. We already calculate `m_line_visual_data`. The only reason to
use a special path is for speed, since you can skip some steps if you
know each line is only 1 line high visually.

However, with code-folding being added, we can't make assumptions about
line height because a line could be hidden and have an effective height
of 0px. So `text_position_at_content_position()` always needs to loop
through the lines to see what our position is, and that function always
needs to be called to calculate the real position.
This commit is contained in:
Sam Atkins 2023-02-09 14:21:52 +00:00 committed by Sam Atkins
parent 7aef096f85
commit 69333e5dbd
Notes: sideshowbarker 2024-07-17 08:34:29 +09:00 
Author: https://github.com/AtkinsSJ
Commit: https://github.com/SerenityOS/serenity/commit/69333e5dbd
Pull-request: https://github.com/SerenityOS/serenity/pull/17395
Reviewed-by: https://github.com/gmta
2 changed files with 16 additions and 57 deletions
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46
Userland/Libraries/LibGUI/EditingEngine.cpp
View File

@ -301,15 +301,8 @@ EditingEngine::DidMoveALine EditingEngine::move_one_up(KeyEvent const& event)
}
return DidMoveALine::No;
}
TextPosition new_cursor;
if (m_editor->is_wrapping_enabled()) {
auto position_above = m_editor->cursor_content_rect().location().translated(0, -m_editor->line_height());
new_cursor = m_editor->text_position_at_content_position(position_above);
} else {
size_t new_line = m_editor->cursor().line() - 1;
size_t new_column = min(m_editor->cursor().column(), m_editor->line(new_line).length());
new_cursor = { new_line, new_column };
}
auto position_above = m_editor->cursor_content_rect().location().translated(0, -m_editor->line_height());
TextPosition new_cursor = m_editor->text_position_at_content_position(position_above);
m_editor->set_cursor(new_cursor);
}
return DidMoveALine::No;
@ -325,15 +318,8 @@ EditingEngine::DidMoveALine EditingEngine::move_one_down(KeyEvent const& event)
}
return DidMoveALine::No;
}
TextPosition new_cursor;
if (m_editor->is_wrapping_enabled()) {
auto position_below = m_editor->cursor_content_rect().location().translated(0, m_editor->line_height());
new_cursor = m_editor->text_position_at_content_position(position_below);
} else {
size_t new_line = m_editor->cursor().line() + 1;
size_t new_column = min(m_editor->cursor().column(), m_editor->line(new_line).length());
new_cursor = { new_line, new_column };
}
auto position_below = m_editor->cursor_content_rect().location().translated(0, m_editor->line_height());
TextPosition new_cursor = m_editor->text_position_at_content_position(position_below);
m_editor->set_cursor(new_cursor);
}
return DidMoveALine::No;
@ -343,17 +329,8 @@ void EditingEngine::move_up(double page_height_factor)
{
if (m_editor->cursor().line() > 0 || m_editor->is_wrapping_enabled()) {
int pixels = (int)(m_editor->visible_content_rect().height() * page_height_factor);
TextPosition new_cursor;
if (m_editor->is_wrapping_enabled()) {
auto position_above = m_editor->cursor_content_rect().location().translated(0, -pixels);
new_cursor = m_editor->text_position_at_content_position(position_above);
} else {
size_t page_step = (size_t)pixels / (size_t)m_editor->line_height();
size_t new_line = m_editor->cursor().line() < page_step ? 0 : m_editor->cursor().line() - page_step;
size_t new_column = min(m_editor->cursor().column(), m_editor->line(new_line).length());
new_cursor = { new_line, new_column };
}
auto position_above = m_editor->cursor_content_rect().location().translated(0, -pixels);
TextPosition new_cursor = m_editor->text_position_at_content_position(position_above);
m_editor->set_cursor(new_cursor);
}
};
@ -362,15 +339,8 @@ void EditingEngine::move_down(double page_height_factor)
{
if (m_editor->cursor().line() < (m_editor->line_count() - 1) || m_editor->is_wrapping_enabled()) {
int pixels = (int)(m_editor->visible_content_rect().height() * page_height_factor);
TextPosition new_cursor;
if (m_editor->is_wrapping_enabled()) {
auto position_below = m_editor->cursor_content_rect().location().translated(0, pixels);
new_cursor = m_editor->text_position_at_content_position(position_below);
} else {
size_t new_line = min(m_editor->line_count() - 1, m_editor->cursor().line() + pixels / m_editor->line_height());
size_t new_column = min(m_editor->cursor().column(), m_editor->lines()[new_line].length());
new_cursor = { new_line, new_column };
}
auto position_below = m_editor->cursor_content_rect().location().translated(0, pixels);
TextPosition new_cursor = m_editor->text_position_at_content_position(position_below);
m_editor->set_cursor(new_cursor);
};
}

27
Userland/Libraries/LibGUI/TextEditor.cpp
View File

@ -149,18 +149,14 @@ TextPosition TextEditor::text_position_at_content_position(Gfx::IntPoint content
size_t line_index = 0;
if (position.y() >= 0) {
if (is_wrapping_enabled()) {
for (size_t i = 0; i < line_count(); ++i) {
auto& rect = m_line_visual_data[i].visual_rect;
if (position.y() >= rect.top() && position.y() <= rect.bottom()) {
line_index = i;
break;
}
if (position.y() > rect.bottom())
line_index = line_count() - 1;
for (size_t i = 0; i < line_count(); ++i) {
auto& rect = m_line_visual_data[i].visual_rect;
if (position.y() >= rect.top() && position.y() <= rect.bottom()) {
line_index = i;
break;
}
} else {
line_index = (size_t)(position.y() / line_height());
if (position.y() > rect.bottom())
line_index = line_count() - 1;
}
line_index = max((size_t)0, min(line_index, line_count() - 1));
}
@ -1357,14 +1353,7 @@ Gfx::IntRect TextEditor::line_content_rect(size_t line_index) const
line_rect.center_vertically_within({ {}, frame_inner_rect().size() });
return line_rect;
}
if (is_wrapping_enabled())
return m_line_visual_data[line_index].visual_rect;
return {
content_x_for_position({ line_index, 0 }),
(int)line_index * line_height(),
text_width_for_font(line.view(), font()),
line_height()
};
return m_line_visual_data[line_index].visual_rect;
}
void TextEditor::set_cursor_and_focus_line(size_t line, size_t column)