X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Ftext.cpp;h=c8c6f55ea3d6597ca348b7dbc911672d93d0ed6e;hb=73afd124ab87e8bace98db55517a56c797a9b8c7;hp=5fc546c21dfe30a0c2eb9eb30662703490bf0c7e;hpb=0af3c2393bd00f39db3bfaf5b78a7a44f0fd5ff1;p=libs%2Fgltk.git

diff --git a/source/text.cpp b/source/text.cpp
index 5fc546c..c8c6f55 100644
--- a/source/text.cpp
+++ b/source/text.cpp
@@ -15,6 +15,19 @@ using namespace std;
 namespace Msp {
 namespace GLtk {
 
+struct Text::RenderData
+{
+	GL::PrimitiveBuilder *bld;
+};
+
+struct Text::CoordsToGeomData
+{
+	unsigned row;
+	unsigned col;
+	Geometry result;
+};
+
+
 Text::Text():
 	style(0)
 { }
@@ -29,9 +42,12 @@ void Text::set_style(const Style *s)
 {
 	style = s;
 
-	float font_size = style->get_font()->get_default_size();
-	for(vector<Line>::iterator i=lines.begin(); i!=lines.end(); ++i)
-		i->width = static_cast<unsigned>(style->get_font()->get_string_width(text.substr(i->start, i->length))*font_size);
+	if(style)
+	{
+		float font_size = style->get_font()->get_default_size();
+		for(vector<Line>::iterator i=lines.begin(); i!=lines.end(); ++i)
+			i->width = static_cast<unsigned>(style->get_font()->get_string_width(text.substr(i->start, i->length))*font_size);
+	}
 }
 
 unsigned Text::get_width() const
@@ -44,6 +60,9 @@ unsigned Text::get_width() const
 
 unsigned Text::get_height() const
 {
+	if(!style)
+		return lines.size();
+
 	const GL::Font *font = style->get_font();
 	float font_size = font->get_default_size();
 	unsigned line_height = static_cast<unsigned>((font->get_ascent()-font->get_descent())*font_size);
@@ -126,7 +145,7 @@ unsigned Text::coords_to_offset(unsigned row, unsigned col) const
 	return lines[row].start+min(col, lines[row].length);
 }
 
-Geometry Text::coords_to_geometry(unsigned row, unsigned col) const
+Geometry Text::coords_to_geometry(const Part &part, const Geometry &parent, unsigned first_row, unsigned row, unsigned col) const
 {
 	if(row>=lines.size())
 		row = lines.size()-1;
@@ -134,55 +153,28 @@ Geometry Text::coords_to_geometry(unsigned row, unsigned col) const
 	if(col>line.length)
 		col = line.length;
 
-	const GL::Font *font = style->get_font();
-	float font_size = font->get_default_size();
-	unsigned line_height = static_cast<unsigned>((font->get_ascent()-font->get_descent())*font_size);
-	unsigned line_spacing = static_cast<unsigned>(font_size*6/5);
-	unsigned height = line_height+(lines.size()-1)*line_spacing;
-	int y_offset = static_cast<int>(-font->get_descent()*font_size);
+	CoordsToGeomData data;
+	data.row = row;
+	data.col = col;
 
-	Geometry geom;
-	geom.w = line.width;
-	geom.h = height;
-	geom.x = static_cast<unsigned>(font->get_string_width(text.substr(line.start, col))*font_size);
-	geom.y = (lines.size()-1-row)*line_spacing+y_offset;
+	process_lines<CoordsToGeomData, &Text::coords_to_geom_line>(part, parent, first_row, data);
 
-	return geom;
+	return data.result;
 }
 
-void Text::render(const Part &part, const Geometry &geom) const
+void Text::render(const Part &part, const Geometry &parent, unsigned first_row) const
 {
-	if(lines.empty())
+	if(!style || lines.empty())
 		return;
 
-	const GL::Font *font = style->get_font();
-	float font_size = font->get_default_size();
-	unsigned line_height = static_cast<unsigned>((font->get_ascent()-font->get_descent())*font_size);
-	unsigned line_spacing = static_cast<unsigned>(font_size*6/5);
-	unsigned height = line_height+(lines.size()-1)*line_spacing;
-	int y_offset = static_cast<int>(-font->get_descent()*font_size);
-
 	const GL::Color &color = style->get_font_color();
 	GL::Immediate imm((GL::COLOR4_UBYTE, GL::TEXCOORD2, GL::VERTEX2));
 	imm.color(color.r, color.g, color.b);
-	for(unsigned i=0; i<lines.size(); ++i)
-	{
-		const Line &line = lines[i];
 
-		Geometry rgeom;
-		rgeom.w = line.width;
-		rgeom.h = height;
-		rgeom.y = (lines.size()-1-i)*line_spacing+y_offset;
-		part.get_alignment().apply(rgeom, geom, part.get_margin());
-
-		GL::push_matrix();
-		GL::translate(rgeom.x, rgeom.y, 0);
-		GL::scale_uniform(font_size);
+	RenderData data;
+	data.bld = &imm;
 
-		font->draw_string(text.substr(line.start, line.length), imm);
-
-		GL::pop_matrix();
-	}
+	process_lines<RenderData, &Text::render_line>(part, parent, first_row, data);
 }
 
 Text &Text::operator=(const string &t)
@@ -194,7 +186,7 @@ Text &Text::operator=(const string &t)
 void Text::find_lines()
 {
 	lines.clear();
-	float font_size = style->get_font()->get_default_size();
+	float font_size = (style ? style->get_font()->get_default_size() : 1);
 	string::size_type start = 0;
 	while(1)
 	{
@@ -203,7 +195,12 @@ void Text::find_lines()
 		Line line;
 		line.start = start;
 		line.length = (newline==string::npos ? text.size() : newline)-start;
-		line.width = static_cast<unsigned>(style->get_font()->get_string_width(text.substr(line.start, line.length))*font_size);
+		line.width = line.length;
+		if(style)
+		{
+			string str = text.substr(line.start, line.length);
+			line.width = static_cast<unsigned>(style->get_font()->get_string_width(str)*font_size);
+		}
 		lines.push_back(line);
 
 		if(newline==string::npos)
@@ -212,5 +209,60 @@ void Text::find_lines()
 	}
 }
 
+template<typename T, void (Text::*func)(unsigned, const Geometry &, T &) const>
+void Text::process_lines(const Part &part, const Geometry &parent, unsigned first_row, T &data) const
+{
+	if(!style)
+		return;
+
+	const GL::Font *font = style->get_font();
+	float font_size = font->get_default_size();
+	unsigned line_height = static_cast<unsigned>((font->get_ascent()-font->get_descent())*font_size);
+	unsigned line_spacing = static_cast<unsigned>(font_size*6/5);
+	unsigned height = line_height+(lines.size()-1)*line_spacing;
+	int y_offset = static_cast<int>(-font->get_descent()*font_size);
+
+	const Sides &margin = part.get_margin();
+	unsigned n_lines = min(lines.size(), max((parent.h-margin.top-margin.bottom)/line_spacing, 1U));
+	first_row = min(first_row, lines.size()-n_lines);
+
+	for(unsigned i=0; i<n_lines; ++i)
+	{
+		const Line &line = lines[first_row+i];
+
+		Geometry rgeom;
+		rgeom.w = line.width;
+		rgeom.h = height;
+		rgeom.y = (n_lines-1-i)*line_spacing+y_offset;
+		part.get_alignment().apply(rgeom, parent, part.get_margin());
+
+		(this->*func)(first_row+i, rgeom, data);
+	}
+}
+
+void Text::render_line(unsigned i, const Geometry &rgeom, RenderData &data) const
+{
+	const Line &line = lines[i];
+	const GL::Font *font = style->get_font();
+
+	GL::PushMatrix _pushm;
+	GL::translate(rgeom.x, rgeom.y, 0);
+	GL::scale_uniform(font->get_default_size());
+
+	font->draw_string(text.substr(line.start, line.length), *data.bld);
+}
+
+void Text::coords_to_geom_line(unsigned i, const Geometry &rgeom, CoordsToGeomData &data) const
+{
+	if(i==data.row)
+	{
+		const Line &line = lines[i];
+		const GL::Font *font = style->get_font();
+
+		data.result = rgeom;
+		data.result.x += static_cast<unsigned>(font->get_string_width(text.substr(line.start, data.col))*font->get_default_size());
+	}
+}
+
 } // namespace GLtk
 } // namespace Msp