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