Adding size range settings to Fl_Tile, initial commit.

- some documentation missing
- Fl_Tile::resize() not satisfying yet
- minimums work, maximums currently ignored
- 0 size children may make program hang

FL/Fl_Rect.H

@@ -88,6 +88,9 @@ public:
   void w(int W) { w_ = W; }             ///< sets the width
   void h(int H) { h_ = H; }             ///< sets the height
 
+  void r(int R) { w_ = R - x_; }        ///< sets the width based on R and x
+  void b(int B) { h_ = B - y_; }        ///< sets the height based on B and y
+
   /** Move all edges in by \p d.
 
     Shrinks the rectangle by \p d at all sides keeping the center of the
@@ -143,6 +146,14 @@ public:
     h_ -= (top + bottom);
   }
 
+  friend bool operator==(const Fl_Rect& lhs, const Fl_Rect& rhs) {
+    return (lhs.x_==rhs.x_) && (lhs.y_==rhs.y_) && (lhs.w_==rhs.w_) && (lhs.h_==rhs.h_);
+  }
+
+  friend bool operator!=(const Fl_Rect& lhs, const Fl_Rect& rhs) {
+    return !(lhs==rhs);
+  }
+
 }; // class Fl_Rect
 
 #endif // Fl_Rect_H

FL/Fl_Tile.H

@@ -28,11 +28,16 @@ class FL_EXPORT Fl_Tile : public Fl_Group {
 public:
   int handle(int event) FL_OVERRIDE;
   Fl_Tile(int X, int Y, int W, int H, const char *L=0);
+  ~Fl_Tile() FL_OVERRIDE;
   void resize(int X, int Y, int W, int H) FL_OVERRIDE;
   virtual void move_intersection(int oldx, int oldy, int newx, int newy);
+  virtual void drag_intersection(int oldx, int oldy, int newx, int newy);
   FL_DEPRECATED("in 1.4.0 - use move_intersection(p) instead",
   void position(int oldx, int oldy, int newx, int newy)) { move_intersection(oldx, oldy, newx, newy); }
   void position(int x, int y) { Fl_Group::position(x, y); }
+  void size_range(int index, int minw, int minh, int maxw=0x7FFFFFFF, int maxh=0x7FFFFFFF);
+  void size_range(Fl_Widget *w , int minw, int minh, int maxw=0x7FFFFFFF, int maxh=0x7FFFFFFF);
+  void init_size_range(int default_min_w = -1, int default_min_h = -1);
 
 protected:
   int cursor_;                  ///< current cursor index (0..3)
@@ -47,6 +52,24 @@ protected:
   }
 
   void set_cursor(int n);       // set one of n (0..3) cursors
+
+  typedef struct { int minw, minh, maxw, maxh; } Size_Range;
+
+  Size_Range *size_range_;
+  int size_range_size_, size_range_capacity_;
+  int default_min_w_, default_min_h_;
+  void request_shrink_l(int old_l, int &new_l, Fl_Rect *final_size);
+  void request_shrink_r(int old_r, int &new_r, Fl_Rect *final_size);
+  void request_shrink_t(int old_t, int &new_t, Fl_Rect *final_size);
+  void request_shrink_b(int old_b, int &new_b, Fl_Rect *final_size);
+  void request_grow_l(int old_l, int &new_l, Fl_Rect *final_size);
+  void request_grow_r(int old_r, int &new_r, Fl_Rect *final_size);
+  void request_grow_t(int old_t, int &new_t, Fl_Rect *final_size);
+  void request_grow_b(int old_b, int &new_b, Fl_Rect *final_size);
+
+  int on_insert(Fl_Widget*, int) FL_OVERRIDE;
+  int on_move(int, int) FL_OVERRIDE;
+  void on_remove(int) FL_OVERRIDE;
 };
 
 #endif

test/tile.cxx

@@ -20,6 +20,7 @@
 #include <FL/Fl_Box.H>
 
 // #define TEST_INACTIVE
+// #define CLASSIC_MODE
 
 int main(int argc, char** argv) {
   Fl_Double_Window window(300, 300);
@@ -27,19 +28,27 @@ int main(int argc, char** argv) {
   window.resizable(window);
 
   Fl_Tile tile(0, 0, 300, 300);
+#ifndef CLASSIC_MODE
+  tile.init_size_range(30, 30); // all children's size shall be at least 30x30
+#endif
 
   // create the symmetrical resize box with dx and dy pixels distance, resp.
   // from the borders of the Fl_Tile widget before all other children
 
+#ifdef CLASSIC_MODE
   int dx = 20, dy = dx; // border width of resizable()
   Fl_Box r(tile.x()+dx,tile.y()+dy,tile.w()-2*dx,tile.h()-2*dy);
   tile.resizable(r);
+#endif
 
   Fl_Box box0(0,0,150,150,"0");
   box0.box(FL_DOWN_BOX);
   box0.color(9);
   box0.labelsize(36);
   box0.align(FL_ALIGN_CLIP);
+#ifndef CLASSIC_MODE
+  tile.resizable(&box0);
+#endif
 
   Fl_Double_Window w1(150,0,150,150,"1");
   w1.box(FL_NO_BOX);