Refactor visible height calculation in Entry and Text

[libs/gltk.git] / source / text.cpp

diff --git a/source/text.cpp b/source/text.cpp
index cdaae859abb481f301ad5a610ae42241f45b5e36..1d824e0ddb9ca590f551748921503e626bcdd931 100644 (file)
--- a/source/text.cpp
+++ b/source/text.cpp
@@ -115,6 +115,22 @@ void Text::insert(unsigned pos, const string &s)
        }
 }
 
+unsigned Text::get_visible_lines(const Part &part, const Geometry &parent, unsigned *fit_height) const
+{
+       const GL::Font &font = style->get_font();
+       float font_size = style->get_font_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);
+
+       const Sides &margin = part.get_margin();
+       unsigned vmargin = margin.top+margin.bottom+line_height-line_spacing;
+       unsigned n_lines = min<unsigned>(lines.size(), max((max(parent.h, vmargin)-vmargin)/line_spacing, 1U));
+       if(fit_height)
+               *fit_height = line_height+(n_lines-1)*line_spacing;
+
+       return n_lines;
+}
+
 unsigned Text::get_line_length(unsigned i) const
 {
        if(i>=lines.size())
@@ -225,14 +241,11 @@ void Text::process_lines(const Part &part, const Geometry &parent, unsigned firs
 
        const GL::Font &font = style->get_font();
        float font_size = style->get_font_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);
        int y_offset = static_cast<int>(-font.get_descent()*font_size);
 
-       const Sides &margin = part.get_margin();
-       unsigned fit_height = parent.h-margin.top-margin.bottom+line_spacing-line_height;
-       unsigned n_lines = min<unsigned>(lines.size(), max(fit_height/line_spacing, 1U));
-       fit_height = line_height+(n_lines-1)*line_spacing;
+       unsigned fit_height;
+       unsigned n_lines = get_visible_lines(part, parent, &fit_height);
        first_row = min<unsigned>(first_row, lines.size()-n_lines);
 
        for(unsigned i=0; i<n_lines; ++i)