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