GUI.h

#ifndef GUI_GUARD
#define GUI_GUARD

#include "Point.h"
#include "fltk.h"
#include "Window.h"
#include "Graph.h"
//#include<vector>
//#include<string>

namespace Graph_lib {

	typedef void* Address;
	typedef void(*Callback)(Address, Address);	// FLTK's required function type for all callbacks

	template<class W> W& reference_to(Address pw)
		// treat an address as a reference to a W
	{
		return *static_cast<W*>(pw);
	}


	class Widget {
		// Widget is a handle to a Fl_widget - it is *not* a Fl_widget
		// We try to keep our interface classes at arm's length from FLTK
	public:
		Widget(Point xy, int w, int h, const string& s, Callback cb)
			:loc(xy), width(w), height(h), label(s), do_it(cb)
		{ }

		virtual void move(int dx, int dy) { hide(); pw->position(loc.x += dx, loc.y += dy); show(); }
		virtual void hide() { pw->hide(); }
		virtual void show() { pw->show(); }
		virtual void attach(Window&) = 0;	// each Widgit define at least one action for a window

		Point loc;
		int width;
		int height;
		string label;
		Callback do_it;

		virtual ~Widget() { }

		/*
		Widget(const Widget& a) :loc(a.loc) { error("attempt to copy Widget by constructor"); }
		Widget& operator=(const Widget& a)
		{
		error("attempt to copy Widget by cassignment");
		return *this;
		}
		*/

	protected:
		Window * own;	// every Widget belongs to a Window
		Fl_Widget* pw;
	private:
		Widget & operator=(const Widget&);	// don't copy Widgets
		Widget(const Widget&);
	};

	class Button : public Widget {
	public:
		Button(Point xy, int ww, int hh, const string& s, Callback cb)
			:Widget(xy, ww, hh, s, cb)
		{
		}
		void attach(Window& win);
	};

	struct In_box : Widget {
		In_box(Point xy, int w, int h, const string& s)
			:Widget(xy, w, h, s, 0)
		{
		}
		int get_int();
		string get_string();

		void attach(Window& win);
	};

	struct Out_box : Widget {
		Out_box(Point xy, int w, int h, const string& s/*, Window& win*/)
			:Widget(xy, w, h, s, 0)
		{
		}
		void put(int);
		void put(const string&);

		void attach(Window& win);
	};

	struct Menu : Widget {
		enum Kind { horizontal, vertical };
		Menu(Point xy, int w, int h, Kind kk, const string& s);
		Vector_ref<Button> selection;
		Kind k;
		int offset;
		int attach(Button& b);	// attach button; Menu does not delete &b
		int attach(Button* p);	// attach new button; Menu deletes p
		void show() { for (int i = 0; i<selection.size(); ++i) selection[i].show(); }
		void hide() { for (int i = 0; i<selection.size(); ++i) selection[i].hide(); }
		void move(int dx, int dy)
		{
			for (int i = 0; i<selection.size(); ++i) selection[i].move(dx, dy);
		}
		//	int insert(int i, const Button& b);	// not implemented

		void attach(Window& win)
		{
			for (int i = 0; i<selection.size(); ++i) win.attach(selection[i]);
		}

	};

}
#endif