Add a persistent view size attribute to List

[libs/gltk.git] / source / slider.h

diff --git a/source/slider.h b/source/slider.h
index c88c15b9f10f84354db7a36465fb53019ecfb2b2..6612c619aaaea80ae2445cd548edd9d38fcd742e 100644 (file)
--- a/source/slider.h
+++ b/source/slider.h
@@ -1,24 +1,50 @@
 #ifndef MSP_GLTK_SLIDER_H_
 #define MSP_GLTK_SLIDER_H_
 
+#include <sigc++/sigc++.h>
 #include "widget.h"
 
 namespace Msp {
 namespace GLtk {
 
+/**
+Sliders are used to adjust numeric values visually.  This class provides the
+common interface for sliders - see classes HSlider and VSlider for concrete
+variations.
+*/
 class Slider: public Widget
 {
 public:
-       void set_value(double);
-       void set_range(double, double);
-       void set_step(double);
-       double get_value() const { return value; }
+       class Loader: public DataFile::DerivedObjectLoader<Slider, Widget::Loader>
+       {
+       public:
+               Loader(Slider &);
+       };
+
+       sigc::signal<void, double> signal_value_changed;
+
 protected:
        double min, max;
        double value;
        double step;
 
-       Slider(const Resourcres &);
+       bool dragging;
+       double drag_start_pos;
+       double drag_start_value;
+       unsigned drag_area_size;
+
+       Slider();
+
+public:
+       void set_value(double);
+       void set_range(double, double);
+       void set_step(double);
+       double get_value() const { return value; }
+
+protected:
+       void start_drag(int);
+       void drag(int);
+       void end_drag();
 };
 
 } // namespace GLtk