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Code Issues Projects Releases Packages Wiki Activity Actions 10

GTextEditor: Add a "span" mechanism for having custom-style text ranges

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It's now possible to give GTextEditor a vector of Span objects.
Spans currently tell the editor which color to use for each character
in the span. This can be used to implement syntax highlighting :^)
This commit is contained in:
Andreas Kling 2019-10-25 21:05:06 +02:00
parent 307cbf83c3
commit 0d53d74d5f
Notes: sideshowbarker 2024-07-19 11:32:43 +09:00
2 changed files with 43 additions and 2 deletions
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22
Libraries/LibGUI/GTextEditor.cpp
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@ -364,7 +364,27 @@ void GTextEditor::paint_event(GPaintEvent& event)
#ifdef DEBUG_GTEXTEDITOR
painter.draw_rect(visual_line_rect, Color::Cyan);
#endif
painter.draw_text(visual_line_rect, visual_line_text, m_text_alignment, Color::Black);
if (m_spans.is_empty()) {
// Fast-path for plain text
painter.draw_text(visual_line_rect, visual_line_text, m_text_alignment, Color::Black);
} else {
int advance = font().glyph_width(' ') + font().glyph_spacing();
Rect character_rect = { visual_line_rect.location(), { font().glyph_width(' '), line_height() } };
for (int i = 0; i < visual_line_text.length(); ++i) {
Color color;
int physical_line = line_index;
int physical_column = start_of_visual_line + i;
// FIXME: This is *horribly* inefficient.
for (auto& span : m_spans) {
if (!span.contains(GTextPosition(physical_line, physical_column)))
continue;
color = span.color;
break;
}
painter.draw_text(character_rect, visual_line_text.substring_view(i, 1), m_text_alignment, color);
character_rect.move_by(advance, 0);
}
}
bool physical_line_has_selection = has_selection && line_index >= selection.start().line() && line_index <= selection.end().line();
if (physical_line_has_selection) {