Replace the derived layout classes with a more flexible design

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

diff --git a/source/layout.h b/source/layout.h
index 2bddb77cfa30bef43632036b8e2564e41e59a06e..85d64ae4d64f4f670365a58fbc921cb7406660a6 100644 (file)
--- a/source/layout.h
+++ b/source/layout.h
@@ -9,6 +9,7 @@
 namespace Msp {
 namespace GLtk {
 
+class Arrangement;
 class Container;
 class Widget;
 
@@ -44,9 +45,9 @@ flag for a widget causes it to use as much space as possible.  If multiple co-
 dependent widgets have the expand flag set, the results are currently
 undefined.
 
-Since specifiyng constraints manually can be quite tedious, there are some
-derived Layout classes that implement common positioning patterns.  See Row,
-Column, MixedRows and Grid.
+Since specifiyng constraints manually can be quite tedious, an Arrangement
+interface is provided to automatically arrange widgets.  See classes Row,
+Column and Grid for some commonly used arrangements.
 */
 class Layout
 {
@@ -84,7 +85,7 @@ public:
                COPY_HEIGHT = VERTICAL|SELF_DIM|TARGET_DIM
        };
 
-protected:
+private:
        struct Slot;
 
        struct Constraint
@@ -116,7 +117,6 @@ protected:
                Packing vert_pack;
 
                Slot(Layout &, Widget &);
-               virtual ~Slot() { }
 
                void autosize_changed();
                void visibility_changed(bool);
@@ -139,12 +139,13 @@ protected:
        unsigned row_spacing;
        unsigned col_spacing;
        Geometry autosize_geom;
+       std::list<Arrangement *> arrangement_stack;
 
        static Pointers pointers[2];
 
 public:
        Layout();
-       virtual ~Layout();
+       ~Layout();
 
        void set_container(Container &);
        void set_margin(const Sides &);
@@ -160,10 +161,13 @@ public:
        LEFT_OF and RIGHT_OF constraints. */
        void set_column_spacing(unsigned);
 
+       void push_arrangement(Arrangement &);
+       Arrangement *get_arrangement() const;
+       void pop_arrangement(Arrangement &);
+
        void add_widget(Widget &);
        void remove_widget(Widget &);
-protected:
-       virtual Slot *create_slot(Widget &);
+private:
        void update_slot_indices();
        Slot &get_slot_for_widget(Widget &);
        static ConstraintType complement(ConstraintType);
@@ -183,7 +187,7 @@ public:
        void update();
        void autosize();
 
-protected:
+private:
        void solve_constraints(int, SolveMode);
 };