source/dropdown.cpp

   1 #include <msp/gl/font.h>
   2 #include "dropdown.h"
   3 #include "list.h"
   4 #include "panel.h"
   5 #include "part.h"
   6 #include "root.h"
   7 #include "style.h"
   8 #include "text.h"
   9
  10 using namespace std;
  11
  12 namespace Msp {
  13 namespace GLtk {
  14
  15 Dropdown::Dropdown():
  16         dropped(false)
  17 {
  18         add(list);
  19         list.signal_item_selected.connect(sigc::mem_fun(this, &Dropdown::list_item_selected));
  20         list.signal_autosize_changed.connect(sigc::mem_fun(this, &Dropdown::list_autosize_changed));
  21 }
  22
  23 void Dropdown::autosize()
  24 {
  25         if(!style)
  26                 return;
  27
  28         Widget::autosize();
  29         geom.w = max(geom.w, list.get_geometry().w);
  30
  31         if(const Part *text_part = style->get_part("text"))
  32         {
  33                 const Sides &margin = text_part->get_margin();
  34                 const GL::Font &font = style->get_font();
  35                 float font_size = style->get_font_size();
  36                 unsigned line_height = static_cast<unsigned>((font.get_ascent()-font.get_descent())*font_size);
  37                 geom.h = max(geom.h, line_height+margin.top+margin.bottom);
  38         }
  39
  40         rebuild();
  41 }
  42
  43 void Dropdown::append(const string &item)
  44 {
  45         list.append(item);
  46 }
  47
  48 void Dropdown::insert(unsigned i, const string &v)
  49 {
  50         list.insert(i, v);
  51 }
  52
  53 void Dropdown::remove(unsigned i)
  54 {
  55         list.remove(i);
  56 }
  57
  58 void Dropdown::clear()
  59 {
  60         list.clear();
  61 }
  62
  63 unsigned Dropdown::get_n_items() const
  64 {
  65         return list.get_n_items();
  66 }
  67
  68 void Dropdown::set_selected_index(int i)
  69 {
  70         list.set_selected_index(i);
  71 }
  72
  73 const string &Dropdown::get_selected() const
  74 {
  75         return list.get_selected();
  76 }
  77
  78 int Dropdown::get_selected_index() const
  79 {
  80         return list.get_selected_index();
  81 }
  82
  83 void Dropdown::rebuild_special(const Part &part, CachedPart &cache)
  84 {
  85         if(part.get_name()=="text")
  86         {
  87                 if(list.get_selected_index()>=0)
  88                         Text(*style, list.get_selected()).build(part, geom, cache);
  89                 else
  90                         cache.texture = 0;
  91         }
  92 }
  93
  94 void Dropdown::render_special(const Part &part, GL::Renderer &renderer) const
  95 {
  96         if(part.get_name()=="list" && dropped)
  97                 list.render(renderer);
  98 }
  99
 100 void Dropdown::button_press(int x, int y, unsigned btn)
 101 {
 102         if(dropped)
 103         {
 104                 Container::button_press(x, y, btn);
 105                 if(!click_focus)
 106                 {
 107                         dropped = false;
 108                         clear_state(ACTIVE);
 109                         signal_ungrab_pointer.emit();
 110                 }
 111         }
 112         else if(btn==1)
 113         {
 114                 dropped = true;
 115                 set_state(ACTIVE);
 116                 signal_grab_pointer.emit();
 117         }
 118 }
 119
 120 void Dropdown::on_geometry_change()
 121 {
 122         resize_list();
 123 }
 124
 125 void Dropdown::on_style_change()
 126 {
 127         resize_list();
 128 }
 129
 130 void Dropdown::list_autosize_changed()
 131 {
 132         resize_list();
 133         signal_autosize_changed.emit();
 134 }
 135
 136 void Dropdown::resize_list()
 137 {
 138         list.autosize_all();
 139         Geometry lgeom = list.get_geometry();
 140         lgeom.x = 0;
 141         lgeom.y = -lgeom.h;
 142         lgeom.w = max(geom.w, lgeom.w);
 143         int root_x = geom.x;
 144         int root_y = geom.y;
 145         for(Widget *p=parent; p; p=p->get_parent())
 146         {
 147                 root_x += p->get_geometry().x;
 148                 root_y += p->get_geometry().y;
 149                 if(Root *root = dynamic_cast<Root *>(p))
 150                 {
 151                         const Geometry &rgeom = root->get_geometry();
 152                         if(lgeom.h*2>rgeom.h)
 153                                 lgeom.h = rgeom.h/2;
 154                         if(root_y+lgeom.y<0)
 155                                 lgeom.y = -root_y;
 156                         if(root_y+lgeom.y+lgeom.h>rgeom.h)
 157                                 lgeom.y = rgeom.h-lgeom.h-root_y;
 158                         if(root_x+lgeom.x+lgeom.w>rgeom.w)
 159                                 lgeom.x = rgeom.w-lgeom.w-root_x;
 160                         break;
 161                 }
 162         }
 163         list.set_geometry(lgeom);
 164 }
 165
 166 void Dropdown::list_item_selected(unsigned index, const std::string &item)
 167 {
 168         if(dropped)
 169         {
 170                 dropped = false;
 171                 clear_state(ACTIVE);
 172                 signal_ungrab_pointer.emit();
 173         }
 174
 175         signal_item_selected.emit(index, item);
 176 }
 177
 178
 179 Dropdown::Loader::Loader(Dropdown &d):
 180         Widget::Loader(d)
 181 {
 182         add("item", &Loader::item);
 183 }
 184
 185 void Dropdown::Loader::item(const string &str)
 186 {
 187         dynamic_cast<Dropdown &>(obj).append(str);
 188 }
 189
 190 } // namespace GLtk
 191 } // namespace Msp