Add Image widget

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

diff --git a/source/slider.cpp b/source/slider.cpp
index 0b1d8b066ee2e992644d9cc0254dc672a6ac8db5..425f721f0ccf052bd0eb74a78b44eaca80570498 100644 (file)
--- a/source/slider.cpp
+++ b/source/slider.cpp
@@ -15,21 +15,23 @@ Slider::Slider(const Resources &r):
        min(0),
        max(1),
        value(0),
-       step(0.1)
+       step(0.1),
+       dragging(false),
+       drag_area_size(0)
 { }
 
 void Slider::set_value(double v)
 {
-       double old_value=value;
+       double old_value = value;
 
        if(v<min)
-               value=min;
+               value = min;
        else if(v>max)
-               value=max;
+               value = max;
        else
        {
-               unsigned steps=static_cast<unsigned>((v-min)/step+0.5);
-               value=min+steps*step;
+               unsigned steps = static_cast<unsigned>((v-min)/step+0.5);
+               value = min+steps*step;
        }
 
        if(value!=old_value)
@@ -38,17 +40,37 @@ void Slider::set_value(double v)
 
 void Slider::set_range(double a, double b)
 {
-       min=a;
-       max=b;
+       min = a;
+       max = b;
        set_value(value);
 }
 
 void Slider::set_step(double s)
 {
-       step=s;
+       step = s;
        set_value(value);
 }
 
+void Slider::start_drag(int p)
+{
+       dragging = true;
+       drag_start_pos = p;
+       drag_start_value = value;
+       state |= ACTIVE;
+}
+
+void Slider::drag(int p)
+{
+       if(max>min)
+               set_value(drag_start_value+(p-drag_start_pos)*(max-min)/drag_area_size);
+}
+
+void Slider::end_drag()
+{
+       dragging = false;
+       state &= ~ACTIVE;
+}
+
 
 Slider::Loader::Loader(Slider &s):
        Widget::Loader(s)