source/hslider.cpp

   1 /* $Id$
   2
   3 This file is part of libmspgltk
   4 Copyright © 2007  Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include <msp/gl/matrix.h>
   9 #include <msp/gl/transform.h>
  10 #include "graphic.h"
  11 #include "hslider.h"
  12 #include "part.h"
  13 #include "style.h"
  14
  15 namespace Msp {
  16 namespace GLtk {
  17
  18 HSlider::HSlider(const Resources &r):
  19         Slider(r),
  20         dragging(false)
  21 {
  22         update_style();
  23 }
  24
  25 void HSlider::button_press(int x, int y, unsigned btn)
  26 {
  27         if(geom.is_inside(x, y))
  28         {
  29                 int sw=get_slider_width();
  30                 int sx=geom.x+static_cast<int>((geom.w-sw)*(value-min)/(max-min));
  31                 if(btn==1 && x>=sx && x<sx+sw)
  32                 {
  33                         dragging=true;
  34                         state=ACTIVE;
  35                         drag_start_x=x;
  36                         drag_start_value=value;
  37                 }
  38         }
  39 }
  40
  41 void HSlider::button_release(int, int, unsigned btn)
  42 {
  43         if(btn==1)
  44         {
  45                 dragging=false;
  46                 state=NORMAL;
  47         }
  48 }
  49
  50 void HSlider::pointer_motion(int x, int)
  51 {
  52         if(dragging)
  53         {
  54                 set_value(drag_start_value+(x-drag_start_x)*(max-min)/(geom.w-get_slider_width()));
  55         }
  56 }
  57
  58 void HSlider::render_special(const Part &part) const
  59 {
  60         if(part.get_name()=="slider")
  61         {
  62                 Alignment align=part.get_alignment();
  63                 align.x=(value-min)/(max-min);
  64
  65                 Geometry pgeom=part.get_geometry();
  66                 align.apply(pgeom, geom, part.get_margin());
  67
  68                 GL::push_matrix();
  69                 GL::translate(pgeom.x, pgeom.y, 0);
  70                 part.get_graphic(state)->render(pgeom.w, pgeom.h);
  71                 GL::pop_matrix();
  72         }
  73 }
  74
  75 unsigned HSlider::get_slider_width() const
  76 {
  77         for(PartSeq::const_iterator i=style->get_parts().begin(); i!=style->get_parts().end(); ++i)
  78                 if(i->get_name()=="slider")
  79                         return i->get_geometry().w;
  80
  81         return 0;
  82 }
  83
  84 } // namespace GLtk
  85 } // namespace Msp