Add some utility functions for dealing with widget hierarchy

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

diff --git a/source/widget.cpp b/source/widget.cpp
index 7496f8bdda1e849c3f35768d2d2ca6f29a11f503..a9c233b5d8c370a0ece166c00bc81a8fb1b1f0ff 100644 (file)
--- a/source/widget.cpp
+++ b/source/widget.cpp
@@ -44,6 +44,8 @@ void Widget::autosize()
                return;
 
        Geometry ageom;
+       ageom.x = geom.x;
+       ageom.y = geom.y;
        const Style::PartSeq &parts = style->get_parts();
        for(Style::PartSeq::const_iterator i=parts.begin(); i!=parts.end(); ++i)
        {
@@ -63,9 +65,29 @@ void Widget::autosize()
 
 void Widget::set_geometry(const Geometry &g)
 {
+       bool size_changed = (g.w!=geom.w || g.h!=geom.h);
        geom = g;
-       on_geometry_change();
-       rebuild();
+       if(size_changed)
+       {
+               // TODO maybe rename this to on_size_change
+               on_geometry_change();
+               rebuild();
+       }
+}
+
+void Widget::map_coords_to_ancestor(int &x, int &y, const Widget &ancestor) const
+{
+       for(const Widget *w=this; w; w=w->get_parent())
+       {
+               if(w==&ancestor)
+                       return;
+
+               const Geometry &wgeom = w->get_geometry();
+               x += wgeom.x;
+               y += wgeom.y;
+       }
+
+       throw hierarchy_error("not an ancestor");
 }
 
 void Widget::set_parent(Container *p)