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