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