Implement Fl_Flowpack.

Which wraps its children and resizes itself vertically to contain them.

FL/Fl_Flowpack.H

@@ -0,0 +1,117 @@
+
+/*******************************************************************************/
+/* Copyright (C) 2009 Jonathan Moore Liles                                     */
+/*                                                                             */
+/* This program is free software; you can redistribute it and/or modify it     */
+/* under the terms of the GNU General Public License as published by the       */
+/* Free Software Foundation; either version 2 of the License, or (at your      */
+/* option) any later version.                                                  */
+/*                                                                             */
+/* This program is distributed in the hope that it will be useful, but WITHOUT */
+/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or       */
+/* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for   */
+/* more details.                                                               */
+/*                                                                             */
+/* You should have received a copy of the GNU General Public License along     */
+/* with This program; see the file COPYING.  If not,write to the Free Software */
+/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+/*******************************************************************************/
+
+#pragma once
+
+#include <FL/Fl_Group.H>
+
+class Fl_Flowpack : public Fl_Group
+{
+    int _hspacing;
+    int _vspacing;
+    int _max_width;
+
+public:
+
+    Fl_Flowpack ( int X, int Y, int W, int H, const char *L = 0 )
+        : Fl_Group( X, Y, W, H, L )
+        {
+            resizable( 0 );
+            _max_width = _hspacing = _vspacing = 0;
+        }
+
+    int max_width ( void ) const { return _max_width; }
+
+    void vspacing ( int v ) { _vspacing = v; }
+    int vspacing ( void ) const { return _vspacing; };
+
+    void hspacing ( int h ) { _hspacing = h; }
+    int hspacing ( void ) const { return _hspacing; };
+
+    void
+    add ( Fl_Widget *w )
+        {
+            Fl_Group::add( w );
+            dolayout();
+        }
+
+    void
+    remove ( Fl_Widget *w )
+        {
+            Fl_Group::remove( w );
+            dolayout();
+        }
+
+    void
+    resize ( int X, int Y, int W, int )
+        {
+            Fl_Group::resize( X, Y, W, layout( W ) );
+        }
+
+    void
+    draw ( void )
+        {
+            dolayout();
+            Fl_Group::draw();
+        }
+
+    void dolayout ( void )
+        {
+            size( w(), layout( w() ) );
+        }
+
+    int
+    layout ( int W )
+        {
+            resizable( 0 );
+
+            int X = 0;
+            int Y = 0;
+            int H = 0;
+
+            _max_width = 0;
+
+            for ( int i = 0; i < children(); ++i )
+            {
+                Fl_Widget *o = child( i );
+
+                if ( ! o->visible() )
+                    continue;
+
+                H = o->h() > H ? o->h() : H;
+
+                if ( X + o->w() >= W )
+                {
+
+                    Y += H + _vspacing;
+                    H = o->h();
+                    X = 0;
+                }
+
+                o->position( x() + X, y() + Y );
+
+                X += o->w() + _hspacing;
+
+                if ( X > _max_width )
+                    _max_width = X;
+            }
+
+            return Y + H;
+        }
+};