Move some more common slider code to the base class

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

diff --git a/source/slider.h b/source/slider.h
index d4ae46b632040fe9b6fb8dd8c90a21a7a5125af8..a2395766a258d6182a04d69fef4a1ccd5ee7bcb7 100644 (file)
--- a/source/slider.h
+++ b/source/slider.h
@@ -7,21 +7,46 @@
 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:
+       class Loader: public DataFile::DerivedObjectLoader<Slider, Widget::Loader>
+       {
+       public:
+               Loader(Slider &);
+       };
+
        sigc::signal<void, double> signal_value_changed;
 
-       void set_value(double);
-       void set_range(double, double);
-       void set_step(double);
-       double get_value() const { return value; }
 protected:
        double min, max;
        double value;
        double step;
 
-       Slider(const Resources &);
+       bool dragging;
+       double drag_start_pos;
+       double drag_start_value;
+       unsigned drag_area_size;
+       unsigned slider_size;
+
+       Slider();
+
+public:
+       void set_value(double);
+       void set_range(double, double);
+       void set_step(double);
+       double get_value() const { return value; }
+
+protected:
+       void click(int);
+       void start_drag(int);
+       void drag(int);
+       void end_drag();
 };
 
 } // namespace GLtk