source/entry.cpp

   1 /* $Id$
   2
   3 This file is part of libmspgltk
   4 Copyright © 2007-2010  Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include <msp/gl/matrix.h>
   9 #include <msp/gl/texture.h>
  10 #include <msp/gl/transform.h>
  11 #include <msp/input/keys.h>
  12 #include "entry.h"
  13 #include "graphic.h"
  14 #include "part.h"
  15 #include "style.h"
  16 #include "vslider.h"
  17
  18 using namespace std;
  19
  20 namespace Msp {
  21 namespace GLtk {
  22
  23 Entry::Entry(const string &t):
  24         text(),
  25         multiline(false),
  26         edit_pos(0),
  27         first_row(0),
  28         visible_rows(1),
  29         text_part(0),
  30         slider(0)
  31 {
  32         set_text(t);
  33 }
  34
  35 void Entry::set_text(const string &t)
  36 {
  37         text = t;
  38         edit_pos = text.size();
  39
  40         if(multiline)
  41                 check_view_range();
  42 }
  43
  44 void Entry::set_multiline(bool m)
  45 {
  46         multiline = m;
  47         if(multiline)
  48         {
  49                 if(!slider)
  50                 {
  51                         slider = new VSlider;
  52                         add(*slider);
  53                         slider->set_step(1);
  54                         slider->signal_value_changed.connect(sigc::mem_fun(this, &Entry::slider_value_changed));
  55                         reposition_slider();
  56                 }
  57                 check_view_range();
  58         }
  59 }
  60
  61 void Entry::key_press(unsigned key, unsigned, wchar_t ch)
  62 {
  63         if(key==Input::KEY_LEFT)
  64         {
  65                 if(edit_pos>0)
  66                 {
  67                         --edit_pos;
  68                         check_view_range();
  69                 }
  70         }
  71         else if(key==Input::KEY_RIGHT)
  72         {
  73                 if(edit_pos<text.size())
  74                 {
  75                         ++edit_pos;
  76                         check_view_range();
  77                 }
  78         }
  79         else if(key==Input::KEY_DOWN && multiline)
  80         {
  81                 unsigned row, col;
  82                 text.offset_to_coords(edit_pos, row, col);
  83                 edit_pos = text.coords_to_offset(row+1, col);
  84                 check_view_range();
  85         }
  86         else if(key==Input::KEY_UP && multiline)
  87         {
  88                 unsigned row, col;
  89                 text.offset_to_coords(edit_pos, row, col);
  90                 if(row>0)
  91                 {
  92                         edit_pos = text.coords_to_offset(row-1, col);
  93                         check_view_range();
  94                 }
  95                 else
  96                         edit_pos = 0;
  97         }
  98         else if(key==Input::KEY_BACKSPACE)
  99         {
 100                 if(edit_pos>0)
 101                 {
 102                         text.erase(--edit_pos, 1);
 103                         check_view_range();
 104                 }
 105         }
 106         else if(key==Input::KEY_ENTER)
 107         {
 108                 if(multiline)
 109                 {
 110                         text.insert(edit_pos++, "\n");
 111                         check_view_range();
 112                 }
 113                 else
 114                         signal_enter.emit();
 115         }
 116         else if(ch>=' ')
 117         {
 118                 text.insert(edit_pos, Codecs::encode<Codecs::Utf8>(Codecs::ustring(1, ch)));
 119                 ++edit_pos;
 120         }
 121 }
 122
 123 void Entry::render_special(const Part &part) const
 124 {
 125         if(part.get_name()=="text")
 126                 text.render(part, geom, first_row);
 127         else if(part.get_name()=="cursor")
 128         {
 129                 if(!text_part || !part.get_graphic(state))
 130                         return;
 131
 132                 unsigned row, col;
 133                 text.offset_to_coords(edit_pos, row, col);
 134
 135                 if(row<first_row || row>=first_row+visible_rows)
 136                         return;
 137
 138                 Geometry rgeom = text.coords_to_geometry(*text_part, geom, first_row, row, col);
 139
 140                 GL::push_matrix();
 141                 GL::translate(rgeom.x, rgeom.y, 0);
 142                 part.get_graphic(state)->render(part.get_geometry().w, part.get_geometry().h);
 143                 GL::pop_matrix();
 144         }
 145         else if(part.get_name()=="slider")
 146                 slider->render();
 147 }
 148
 149 void Entry::on_geometry_change()
 150 {
 151         reposition_slider();
 152
 153         if(multiline)
 154                 check_view_range();
 155 }
 156
 157 void Entry::on_style_change()
 158 {
 159         text.set_style(style);
 160
 161         if(!style)
 162         {
 163                 text_part = 0;
 164                 return;
 165         }
 166
 167         text_part = style->get_part("text");
 168
 169         reposition_slider();
 170
 171         if(multiline)
 172                 check_view_range();
 173 }
 174
 175 void Entry::reposition_slider()
 176 {
 177         if(!style || !slider)
 178                 return;
 179
 180         if(const Part *slider_part = style->get_part("slider"))
 181         {
 182                 Geometry sgeom = slider_part->get_geometry();
 183                 slider_part->get_alignment().apply(sgeom, geom, slider_part->get_margin());
 184                 slider->set_geometry(sgeom);
 185         }
 186 }
 187
 188 void Entry::slider_value_changed(double value)
 189 {
 190         if(text.get_n_lines()>visible_rows)
 191                 first_row = text.get_n_lines()-visible_rows-static_cast<unsigned>(value);
 192 }
 193
 194 void Entry::check_view_range()
 195 {
 196         if(!multiline || !text_part)
 197                 return;
 198
 199         const GL::Font *font = style->get_font();
 200         float font_size = font->get_default_size();
 201         unsigned line_spacing = static_cast<unsigned>(font_size*6/5);
 202
 203         const Sides &margin = text_part->get_margin();
 204         visible_rows = max((geom.h-margin.top-margin.bottom)/line_spacing, 1U);
 205
 206         unsigned row, col;
 207         text.offset_to_coords(edit_pos, row, col);
 208
 209         if(first_row>row)
 210                 first_row = row;
 211         else if(row>=first_row+visible_rows)
 212                 first_row = row+1-visible_rows;
 213
 214         if(slider)
 215         {
 216                 unsigned scroll = max(text.get_n_lines(), visible_rows)-visible_rows;
 217                 slider->set_range(0, scroll);
 218                 slider->set_value(scroll-first_row);
 219         }
 220 }
 221
 222
 223 Entry::Loader::Loader(Entry &ent):
 224         Widget::Loader(ent)
 225 { }
 226
 227 } // namespace GLtk
 228 } // namespace Msp