Method GetTextStringMetrics

src/SFGUI/Engine.cpp:126–170

}

sf::Vector2f Engine::GetTextStringMetrics( const std::u32string& string, const sf::Font& font, unsigned int font_size ) const {
	// SFML is incapable of giving us the metrics we need so we have to do it ourselves.
	auto horizontal_spacing = static_cast<float>( font.getGlyph( L' ', font_size, false ).advance );
	auto vertical_spacing = static_cast<float>( font.getLineSpacing( font_size ) );

	sf::Vector2f metrics( 0.f, 0.f );

	const static auto tab_spaces = 2.f;

	std::uint32_t previous_character = 0;

	auto longest_line = 0.f;

	for( const auto& current_character : string ) {
		metrics.x += static_cast<float>( font.getKerning( previous_character, current_character, font_size ) );

		switch( current_character ) {
			case L' ':
				metrics.x += horizontal_spacing;
				continue;
			case L'\t':
				metrics.x += horizontal_spacing * tab_spaces;
				continue;
			case L'\n':
				metrics.y += vertical_spacing;
				longest_line = std::max( metrics.x, longest_line );
				metrics.x = 0.f;
				continue;
			case L'\v':
				metrics.y += vertical_spacing * tab_spaces;
				continue;
			default:
				break;
		}

		const auto& glyph = font.getGlyph( current_character, font_size, false );

		metrics.x += static_cast<float>( glyph.advance );
		metrics.y = std::max( metrics.y, static_cast<float>( glyph.bounds.size.y ) );
	}

	metrics.x = std::max( longest_line, metrics.x );

	return metrics;
}

sf::Vector2f Engine::GetTextStringMetrics( const sf::String& string, const sf::Font& font, unsigned int font_size ) const {
	// SFML is incapable of giving us the metrics we need so we have to do it ourselves.