source/entry.cpp

   1 /* $Id$
   2
   3 This file is part of libmspgltk
   4 Copyright © 2007-2011  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::autosize()
  36 {
  37         if(!style)
  38                 return;
  39
  40         Widget::autosize();
  41
  42         if(text_part)
  43         {
  44                 const Sides &margin = text_part->get_margin();
  45                 const GL::Font &font = *style->get_font();
  46                 unsigned en_width = static_cast<unsigned>(font.get_string_width("n")*font.get_native_size());
  47                 geom.w = max(geom.w, 10*en_width+margin.left+margin.right);
  48
  49                 unsigned line_height = static_cast<unsigned>((font.get_ascent()-font.get_descent())*font.get_native_size());
  50                 if(multiline)
  51                 {
  52                         unsigned line_spacing = font.get_native_size()*6/5;
  53                         geom.h = max(geom.h, line_height+line_spacing*2+margin.top+margin.bottom);
  54                 }
  55                 else
  56                         geom.h = max(geom.h, line_height+margin.top+margin.bottom);
  57         }
  58
  59         if(multiline)
  60         {
  61                 if(const Part *slider_part = style->get_part("slider"))
  62                 {
  63                         Geometry sgeom = slider_part->get_geometry();
  64                         if(!sgeom.w || !sgeom.h)
  65                         {
  66                                 slider->autosize();
  67                                 if(!sgeom.w)
  68                                         sgeom.w = slider->get_geometry().w;
  69                                 if(!sgeom.h)
  70                                         sgeom.h = slider->get_geometry().h;
  71                         }
  72
  73                         const Sides &margin = slider_part->get_margin();
  74                         geom.w = max(geom.w, sgeom.w+margin.left+margin.right);
  75                         geom.h = max(geom.h, sgeom.h+margin.top+margin.bottom);
  76
  77                         reposition_slider();
  78                 }
  79
  80                 check_view_range();
  81         }
  82 }
  83
  84 void Entry::set_text(const string &t)
  85 {
  86         text = t;
  87         edit_pos = text.size();
  88
  89         if(multiline)
  90                 check_view_range();
  91 }
  92
  93 void Entry::set_multiline(bool m)
  94 {
  95         multiline = m;
  96         if(multiline)
  97         {
  98                 if(!slider)
  99                 {
 100                         slider = new VSlider;
 101                         add(*slider);
 102                         slider->set_step(1);
 103                         slider->signal_value_changed.connect(sigc::mem_fun(this, &Entry::slider_value_changed));
 104                         reposition_slider();
 105                 }
 106                 check_view_range();
 107         }
 108 }
 109
 110 void Entry::render_special(const Part &part) const
 111 {
 112         if(part.get_name()=="text")
 113                 text.render(part, geom, first_row);
 114         else if(part.get_name()=="cursor")
 115         {
 116                 if(!text_part || !part.get_graphic(state))
 117                         return;
 118
 119                 unsigned row, col;
 120                 text.offset_to_coords(edit_pos, row, col);
 121
 122                 if(row<first_row || row>=first_row+visible_rows)
 123                         return;
 124
 125                 Geometry rgeom = text.coords_to_geometry(*text_part, geom, first_row, row, col);
 126
 127                 GL::push_matrix();
 128                 GL::translate(rgeom.x, rgeom.y, 0);
 129                 part.get_graphic(state)->render(part.get_geometry().w, part.get_geometry().h);
 130                 GL::pop_matrix();
 131         }
 132         else if(part.get_name()=="slider" && multiline)
 133                 slider->render();
 134 }
 135
 136 void Entry::key_press(unsigned key, unsigned, wchar_t ch)
 137 {
 138         if(key==Input::KEY_LEFT)
 139         {
 140                 if(edit_pos>0)
 141                 {
 142                         --edit_pos;
 143                         check_view_range();
 144                 }
 145         }
 146         else if(key==Input::KEY_RIGHT)
 147         {
 148                 if(edit_pos<text.size())
 149                 {
 150                         ++edit_pos;
 151                         check_view_range();
 152                 }
 153         }
 154         else if(key==Input::KEY_DOWN && multiline)
 155         {
 156                 unsigned row, col;
 157                 text.offset_to_coords(edit_pos, row, col);
 158                 edit_pos = text.coords_to_offset(row+1, col);
 159                 check_view_range();
 160         }
 161         else if(key==Input::KEY_UP && multiline)
 162         {
 163                 unsigned row, col;
 164                 text.offset_to_coords(edit_pos, row, col);
 165                 if(row>0)
 166                 {
 167                         edit_pos = text.coords_to_offset(row-1, col);
 168                         check_view_range();
 169                 }
 170                 else
 171                         edit_pos = 0;
 172         }
 173         else if(key==Input::KEY_BACKSPACE)
 174         {
 175                 if(edit_pos>0)
 176                 {
 177                         text.erase(--edit_pos, 1);
 178                         check_view_range();
 179                 }
 180         }
 181         else if(key==Input::KEY_ENTER)
 182         {
 183                 if(multiline)
 184                 {
 185                         text.insert(edit_pos++, "\n");
 186                         check_view_range();
 187                 }
 188                 else
 189                         signal_enter.emit();
 190         }
 191         else if(ch>=' ')
 192         {
 193                 text.insert(edit_pos, Codecs::encode<Codecs::Utf8>(Codecs::ustring(1, ch)));
 194                 ++edit_pos;
 195         }
 196 }
 197
 198 void Entry::on_geometry_change()
 199 {
 200         reposition_slider();
 201
 202         if(multiline)
 203                 check_view_range();
 204 }
 205
 206 void Entry::on_style_change()
 207 {
 208         text.set_style(style);
 209
 210         if(!style)
 211         {
 212                 text_part = 0;
 213                 return;
 214         }
 215
 216         text_part = style->get_part("text");
 217
 218         reposition_slider();
 219
 220         if(multiline)
 221                 check_view_range();
 222 }
 223
 224 void Entry::reposition_slider()
 225 {
 226         if(!style || !slider)
 227                 return;
 228
 229         if(const Part *slider_part = style->get_part("slider"))
 230         {
 231                 Geometry sgeom = slider_part->get_geometry();
 232                 if(!sgeom.w || !sgeom.h)
 233                 {
 234                         slider->autosize();
 235                         if(!sgeom.w)
 236                                 sgeom.w = slider->get_geometry().w;
 237                         if(!sgeom.h)
 238                                 sgeom.h = slider->get_geometry().h;
 239                 }
 240
 241                 slider_part->get_alignment().apply(sgeom, geom, slider_part->get_margin());
 242                 slider->set_geometry(sgeom);
 243         }
 244 }
 245
 246 void Entry::check_view_range()
 247 {
 248         if(!multiline || !text_part)
 249                 return;
 250
 251         const GL::Font *font = style->get_font();
 252         float font_size = font->get_default_size();
 253         unsigned line_spacing = static_cast<unsigned>(font_size*6/5);
 254
 255         const Sides &margin = text_part->get_margin();
 256         visible_rows = max((geom.h-margin.top-margin.bottom)/line_spacing, 1U);
 257
 258         unsigned row, col;
 259         text.offset_to_coords(edit_pos, row, col);
 260
 261         if(first_row>row)
 262                 first_row = row;
 263         else if(row>=first_row+visible_rows)
 264                 first_row = row+1-visible_rows;
 265
 266         unsigned scroll = max(text.get_n_lines(), visible_rows)-visible_rows;
 267         slider->set_range(0, scroll);
 268         slider->set_value(scroll-first_row);
 269 }
 270
 271 void Entry::slider_value_changed(double value)
 272 {
 273         if(text.get_n_lines()>visible_rows)
 274                 first_row = text.get_n_lines()-visible_rows-static_cast<unsigned>(value);
 275 }
 276
 277
 278 Entry::Loader::Loader(Entry &ent):
 279         Widget::Loader(ent)
 280 { }
 281
 282 } // namespace GLtk
 283 } // namespace Msp