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