source/dropdown.cpp

   1 /* $Id$
   2
   3 This file is part of libmspgltk
   4 Copyright © 2007-2009  Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include <msp/gl/font.h>
   9 #include "dropdown.h"
  10 #include "list.h"
  11 #include "panel.h"
  12 #include "part.h"
  13 #include "style.h"
  14
  15 using namespace std;
  16
  17 namespace Msp {
  18 namespace GLtk {
  19
  20 Dropdown::Dropdown(const Resources &r):
  21         Widget(r),
  22         Container(r),
  23         list(r),
  24         dropped(false)
  25 {
  26         add(list);
  27         list.signal_item_selected.connect(sigc::mem_fun(this, &Dropdown::list_item_selected));
  28
  29         update_style();
  30 }
  31
  32 void Dropdown::append(const string &item)
  33 {
  34         list.append(item);
  35         resize_list();
  36 }
  37
  38 void Dropdown::insert(unsigned i, const string &v)
  39 {
  40         list.insert(i, v);
  41         resize_list();
  42 }
  43
  44 void Dropdown::remove(unsigned i)
  45 {
  46         list.remove(i);
  47         resize_list();
  48 }
  49
  50 void Dropdown::clear()
  51 {
  52         list.clear();
  53         resize_list();
  54 }
  55
  56 unsigned Dropdown::get_n_items() const
  57 {
  58         return list.get_n_items();
  59 }
  60
  61 void Dropdown::set_selected_index(int i)
  62 {
  63         list.set_selected_index(i);
  64 }
  65
  66 const string &Dropdown::get_selected() const
  67 {
  68         return list.get_selected();
  69 }
  70
  71 int Dropdown::get_selected_index() const
  72 {
  73         return list.get_selected_index();
  74 }
  75
  76 void Dropdown::button_press(int x, int y, unsigned btn)
  77 {
  78         if(dropped)
  79         {
  80                 Container::button_press(x, y, btn);
  81                 if(!click_focus)
  82                 {
  83                         dropped=false;
  84                         state&=~ACTIVE;
  85                         signal_ungrab_pointer.emit();
  86                 }
  87         }
  88         else if(btn==1)
  89         {
  90                 dropped=true;
  91                 state|=ACTIVE;
  92                 signal_grab_pointer.emit();
  93         }
  94 }
  95
  96 void Dropdown::render_special(const Part &part) const
  97 {
  98         if(part.get_name()=="text")
  99         {
 100                 if(list.get_selected_index()>=0)
 101                         render_text(part, list.get_selected());
 102         }
 103         else if(part.get_name()=="list" && dropped)
 104                 list.render();
 105 }
 106
 107 void Dropdown::on_geometry_change()
 108 {
 109         resize_list();
 110 }
 111
 112 void Dropdown::resize_list()
 113 {
 114         // XXX This is a hack.
 115         unsigned n_items=list.get_n_items();
 116         const Style &stl=list.get_style();
 117         const GL::Font &font=*stl.get_font();
 118         unsigned h=min(max(n_items, 1U), 10U)*static_cast<unsigned>((font.get_ascent()-font.get_descent())*font.get_default_size());
 119         for(std::list<Part>::const_iterator i=stl.get_parts().begin(); i!=stl.get_parts().end(); ++i)
 120                 if(i->get_name()=="items")
 121                 {
 122                         const Sides &margin=i->get_margin();
 123                         h+=margin.top+margin.bottom;
 124                 }
 125         list.set_geometry(Geometry(0, -h, geom.w, h));
 126 }
 127
 128 void Dropdown::list_item_selected(unsigned index, const std::string &item)
 129 {
 130         if(dropped)
 131         {
 132                 dropped=false;
 133                 state&=~ACTIVE;
 134                 signal_ungrab_pointer.emit();
 135         }
 136
 137         signal_item_selected.emit(index, item);
 138 }
 139
 140
 141 Dropdown::Loader::Loader(Dropdown &d):
 142         Widget::Loader(d)
 143 {
 144         add("item", &Loader::item);
 145 }
 146
 147 void Dropdown::Loader::item(const string &str)
 148 {
 149         dynamic_cast<Dropdown &>(wdg).append(str);
 150 }
 151
 152 } // namespace GLtk
 153 } // namespace Msp