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