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/*
 * Canvas-based rendering of views
 *
 * Author:
 *    Miguel de Icaza (miguel@kernel.org)
 *
 * Copyright (C) 1999, 2000 Ximian, Inc.
 */

#ifndef BONOBO_CANVAS_IDL
#define BONOBO_CANVAS_IDL

#include "Bonobo_Unknown.idl"
#include "Bonobo_Gdk.idl"
#include "Bonobo_UI.idl"

module Bonobo {

module Canvas {
	typedef sequence<octet> pixbuf;

	/* At least 32 bits */
	typedef long int32;

	struct IRect {
		long x0, y0, x1, y1;
	};

	struct DRect {
		double x0, y0, x1, y1;
	};

	const short IS_BG  = 1;
	const short IS_BUF = 2;

	typedef double affine [6];

	/*
	 * See gnome-canvas.h:GnomeCanvasBuf for an explanation
	 */
	struct Buf {
		pixbuf rgb_buf;
		long   row_stride;
		IRect  rect;
		int32  bg_color;
		short  flags;
	};

	struct Point {
		double x, y;
	};

	typedef sequence<Point> Points;

	struct SVPSegment {
		boolean up;     /* up or down */
	        DRect   bbox;
		Canvas::Points  points;
	};
			  
	typedef sequence<SVPSegment> SVP;
      
	struct ArtUTA {
		short   x0, y0;
		short   width, height;
		sequence<int32> utiles;
	};

	struct State {
		affine item_aff;
		double pixels_per_unit;
		double canvas_scroll_x1;
		double canvas_scroll_y1;
		long   zoom_xofs, zoom_yofs;
		long   xoffset, yoffset;
	};

	interface Component : Bonobo::Unknown {

		/** 
		 * update:
		 * 
		 * Returns the update region.
		 */
		ArtUTA update  (in Canvas::State state,
				in affine aff, in SVP clip_path, in long flags,
				out double x1, out double y1, out double x2, out double y2);

		void realize (in Gdk::WindowId drawable);
		void unrealize ();
		void map ();
		void unmap ();

		void draw   (in Canvas::State state,
			     in Gdk::WindowId drawable, 
			     in short x, in short y, 
			     in short width, in short height);

		/**
		 * render:
		 * @buf: The render control buffer.
		 * 
		 * This version of render has buf->flags & IS_BUF == FALSE, 
		 * so we avoid sending the buffer out, we just return it.
		 *
		 */
		void render (inout Canvas::Buf buf);

		/**
		 * contains:
		 * @x: x coordinate 
		 * @y: y coordinate
		 *
		 * Returns true if the point at @x, @y is contained inside
		 * the item
		 */
		boolean contains (in double x, in double y);

		void bounds (in Canvas::State state, 
			     out double x1, out double x2, 
			     out double y1, out double y2);

		boolean event (in Canvas::State state, 
			       in Bonobo::Gdk::Event event);

		/**
		 * setCanvasSize:
		 *
		 * Notifies this item about the size of the Canvas size on the 
		 * canvas
		 */
		void setCanvasSize (in short x, in short y, in short width, in short height);

		/**
		 * setBounds:
		 * @bbox: the requested bounding box.
		 *
		 * Sets the bounding box of the item to (x1,y1)-(x2,y2)
		 */
		void setBounds (in DRect bbox);

		void unImplemented1 ();
		void unImplemented2 ();
		void unImplemented3 ();
		void unImplemented4 ();
		void unImplemented5 ();
		void unImplemented6 ();
		void unImplemented7 ();
		void unImplemented8 ();
	};

	/*
	 * This interface is used on the container side to forward
	 * events to the real containing canvas and the item
	 */
	
	interface ComponentProxy {
		/**
		 * requestUpdate:
		 *
		 * Requests an update of the client side canvas.
		 */
		void requestUpdate ();
		
		/**
		 * grabFocus:
		 * @mask: Gdk Event mask to grab.
		 * @cursor: GdkCursorType to display during grab.
		 * @time: time of last event before grab.
		 *
	 	 * Grabs the mouse focus.
		 */
		void grabFocus (in unsigned long mask,
				in long cursor,
				in unsigned long time);
		
		/**
		 * ungrabFocus:
		 * @time: time of last event before ungrab.
		 *
	 	 * Ungrabs the mouse focus.
		 */
		void ungrabFocus (in unsigned long time);
		
		/**
		 * getUIContainer:
		 *
	 	 * Returns: an associated UI component or NIL.
		 */
		UIContainer getUIContainer ();

		void unImplemented1 ();
		void unImplemented2 ();
		void unImplemented3 ();
		void unImplemented4 ();
		void unImplemented5 ();
		void unImplemented6 ();
		void unImplemented7 ();
		void unImplemented8 ();
	};
};

};

#endif /* BONOBO_CANVAS_IDL */