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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 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/0d53d74d5f1
2 changed files with 43 additions and 2 deletions
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22
Libraries/LibGUI/GTextEditor.cpp
View File

@ -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) {

23
Libraries/LibGUI/GTextEditor.h
View File

@ -167,6 +167,26 @@ public:
void set_cursor(int line, int column);
void set_cursor(const GTextPosition&);
struct Span {
bool contains(const GTextPosition& position) const
{
if (!(position.line() > start.line() || (position.line() == start.line() && position.column() >= start.column())))
return false;
if (!(position.line() < end.line() || (position.line() == end.line() && position.column() <= end.column())))
return false;
return true;
}
GTextPosition start;
GTextPosition end;
Color color;
};
void set_spans(const Vector<Span>& spans)
{
m_spans = spans;
}
protected:
GTextEditor(Type, GWidget* parent);
@ -187,7 +207,6 @@ protected:
virtual void resize_event(GResizeEvent&) override;
private:
void create_actions();
void paint_ruler(Painter&);
void update_content_size();
@ -274,6 +293,8 @@ private:
RefPtr<GAction> m_delete_action;
CElapsedTimer m_triple_click_timer;
NonnullRefPtrVector<GAction> m_custom_context_menu_actions;
Vector<Span> m_spans;
};
inline const LogStream& operator<<(const LogStream& stream, const GTextPosition& value)