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LibGUI: Add word wrapping to Labels

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Adds basic word wrap support to Label widgets. Doesn't yet
negotiate autosize or Center/Bottom TextAlignments perfectly.
This commit is contained in:
thankyouverycool 2021-03-01 14:52:04 -05:00 • committed by Andreas Kling
parent 1aa605bc03
commit 0443cd4eed
2 changed files with 95 additions and 8 deletions
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95
Userland/Libraries/LibGUI/Label.cpp
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@ -47,6 +47,7 @@ Label::Label(String text)
REGISTER_STRING_PROPERTY("text", text, set_text);
REGISTER_BOOL_PROPERTY("autosize", is_autosize, set_autosize);
REGISTER_BOOL_PROPERTY("word_wrap", is_word_wrap, set_word_wrap);
}
Label::~Label()
@ -62,6 +63,15 @@ void Label::set_autosize(bool autosize)
size_to_fit();
}
void Label::set_word_wrap(bool wrap)
{
if (m_word_wrap == wrap)
return;
m_word_wrap = wrap;
if (is_word_wrap())
wrap_text();
}
void Label::set_icon(const Gfx::Bitmap* icon)
{
if (m_icon == icon)
@ -75,19 +85,21 @@ void Label::set_text(String text)
if (text == m_text)
return;
m_text = move(text);
if (is_word_wrap())
wrap_text();
if (m_autosize)
size_to_fit();
update();
did_change_text();
}
Gfx::IntRect Label::text_rect() const
Gfx::IntRect Label::text_rect(size_t line) const
{
int indent = 0;
if (frame_thickness() > 0)
indent = font().glyph_width('x') / 2;
auto rect = frame_inner_rect();
rect.move_by(indent, 0);
rect.move_by(indent, line * (font().glyph_height() + 1));
rect.set_width(rect.width() - indent * 2);
return rect;
}
@ -107,15 +119,30 @@ void Label::paint_event(PaintEvent& event)
painter.blit(icon_location, *m_icon, m_icon->rect());
}
}
if (text().is_empty())
return;
auto text_rect = this->text_rect();
if (is_enabled()) {
painter.draw_text(text_rect, text(), m_text_alignment, palette().color(foreground_role()), Gfx::TextElision::Right);
if (is_word_wrap()) {
wrap_text();
for (size_t i = 0; i < m_lines.size(); i++) {
auto& line = m_lines[i];
auto text_rect = this->text_rect(i);
if (is_enabled()) {
painter.draw_text(text_rect, line, m_text_alignment, palette().color(foreground_role()), Gfx::TextElision::None);
} else {
painter.draw_text(text_rect.translated(1, 1), line, font(), text_alignment(), Color::White, Gfx::TextElision::Right);
painter.draw_text(text_rect, line, font(), text_alignment(), Color::from_rgb(0x808080), Gfx::TextElision::Right);
}
}
} else {
painter.draw_text(text_rect.translated(1, 1), text(), font(), text_alignment(), Color::White, Gfx::TextElision::Right);
painter.draw_text(text_rect, text(), font(), text_alignment(), Color::from_rgb(0x808080), Gfx::TextElision::Right);
auto text_rect = this->text_rect();
if (is_enabled()) {
painter.draw_text(text_rect, text(), m_text_alignment, palette().color(foreground_role()), Gfx::TextElision::Right);
} else {
painter.draw_text(text_rect.translated(1, 1), text(), font(), text_alignment(), Color::White, Gfx::TextElision::Right);
painter.draw_text(text_rect, text(), font(), text_alignment(), Color::from_rgb(0x808080), Gfx::TextElision::Right);
}
}
}
@ -124,4 +151,58 @@ void Label::size_to_fit()
set_fixed_width(font().width(m_text));
}
void Label::wrap_text()
{
Vector<String> words;
Optional<size_t> start;
for (size_t i = 0; i < m_text.length(); i++) {
switch (m_text[i]) {
case '\n':
case '\r':
case '\t':
case ' ': {
if (start.has_value())
words.append(m_text.substring(start.value(), i - start.value()));
start.clear();
continue;
}
default: {
if (!start.has_value())
start = i;
}
}
}
if (start.has_value())
words.append(m_text.substring(start.value(), m_text.length() - start.value()));
auto rect = frame_inner_rect();
if (frame_thickness() > 0)
rect.set_width(rect.width() - font().glyph_width('x'));
Vector<String> lines;
StringBuilder builder;
int line_width = 0;
for (auto& word : words) {
int word_width = font().width(word);
if (line_width > 0)
word_width += font().glyph_width('x');
if (line_width + word_width > rect.width()) {
lines.append(builder.to_string());
builder.clear();
line_width = 0;
}
if (line_width > 0)
builder.append(' ');
builder.append(word);
line_width += word_width;
}
auto last_line = builder.to_string();
if (!last_line.is_empty())
lines.append(last_line);
m_lines = lines;
}
}