Pass coordinates relative to the receiving widget's geometry

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

diff --git a/source/slider.cpp b/source/slider.cpp
index 0b1d8b066ee2e992644d9cc0254dc672a6ac8db5..dacd826630bc670cb364f8fa0d27c27f005cdc64 100644 (file)
--- a/source/slider.cpp
+++ b/source/slider.cpp
@@ -15,7 +15,9 @@ 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)
@@ -49,6 +51,24 @@ void Slider::set_step(double s)
        set_value(value);
 }
 
+void Slider::start_drag(int p)
+{
+       dragging=true;
+       drag_start_pos=p;
+       drag_start_value=value;
+}
+
+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;
+}
+
 
 Slider::Loader::Loader(Slider &s):
        Widget::Loader(s)