Initial revision

git-svn-id: file:///fltk/svn/fltk/trunk@2 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

1 files changed, 59 insertions, 0 deletions

diff --git a/FL/Fl_Valuator.H b/FL/Fl_Valuator.H
new file mode 100644
index 000000000..4444bdd8d
--- /dev/null
+++ b/FL/Fl_Valuator.H
@@ -0,0 +1,59 @@
+// Fl_Valuator.H
+
+// Base class for sliders and all other one-value "knobs"
+
+#ifndef Fl_Valuator_H
+#define Fl_Valuator_H
+
+#ifndef Fl_Widget_H
+#include "Fl_Widget.H"
+#endif
+
+// shared type() values for classes that work in both directions:
+#define FL_VERTICAL		0
+#define FL_HORIZONTAL		1
+
+class Fl_Valuator : public Fl_Widget {
+
+  double value_;
+  double previous_value_;
+  double min, max; // truncates to this range *after* rounding
+  double A; int B; // rounds to multiples of A/B, or no rounding if A is zero
+
+protected:
+
+  int horizontal() const {return type()&1;}
+  Fl_Valuator(int X, int Y, int W, int H, const char* L);
+
+  double previous_value() const {return previous_value_;}
+  void handle_push() {previous_value_ = value_;}
+  double softclamp(double);
+  void handle_drag(double newvalue);
+  void handle_release(); // use drag() value
+  virtual void value_damage(); // cause damage() due to value() changing
+
+public:
+
+  void bounds(double a, double b) {min=a; max=b;}
+  double minimum() const {return min;}
+  void minimum(double a) {min = a;}
+  double maximum() const {return max;}
+  void maximum(double a) {max = a;}
+  void range(double a, double b) {min = a; max = b;}
+  void step(int a) {A = a; B = 1;}
+  void step(double a, int b) {A = a; B = b;}
+  void step(double s);
+  double step() const {return A/B;}
+  void precision(int);
+
+  double value() const {return value_;}
+  int value(double);
+
+  virtual int format(char*);
+  double round(double); // round to nearest multiple of step
+  double clamp(double); // keep in range
+  double increment(double, int); // add n*step to value
+};
+
+#endif
+