// -*- c++ -*-
// Generated by gtkmmproc -- DO NOT MODIFY!
#ifndef _PANGOMM_LAYOUTLINE_H
#define _PANGOMM_LAYOUTLINE_H

#include <glibmm.h>

/* $Id: layoutline.hg,v 1.9 2002/09/10 10:05:33 murrayc Exp $ */

/* layoutline.h
 *
 * Copyright (C) 1998-1999 The gtkmm Development Team
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <glibmm/slisthandle.h> // For the Glib::SListHandle typedef
#include <pangomm/rectangle.h>
#include <pango/pango-layout.h>


namespace Pango
{

/** A Pango::LayoutLine represents one of the lines resulting from laying out a paragraph via Pango::Layout.
 * Pango::LayoutLine objects are obtained by calling Pango::Layout::get_line()
 * and are only valid until the text, attributes, or settings of the parent Pango::Layout are modified.
 * Routines for rendering Pango::Layout objects are provided in code specific to each rendering system.
 */
class LayoutLine
{
  public:
#ifndef DOXYGEN_SHOULD_SKIP_THIS
  typedef LayoutLine CppObjectType;
  typedef PangoLayoutLine BaseObjectType;
#endif /* DOXYGEN_SHOULD_SKIP_THIS */


  // For use with Glib::RefPtr<> only.
  void reference()   const;
  void unreference() const;

  ///Provides access to the underlying C instance.
  PangoLayoutLine*       gobj();

  ///Provides access to the underlying C instance.
  const PangoLayoutLine* gobj() const;

  // The caller is responsible for freeing it. Use when directly setting fields in structs.
  PangoLayoutLine* gobj_copy() const;

protected:
  // Do not derive this.  Pango::LayoutLine can neither be constructed nor deleted.
  LayoutLine();
  void operator delete(void*, size_t);

private:
  // noncopyable
  LayoutLine(const LayoutLine&);
  LayoutLine& operator=(const LayoutLine&);


public:

  
  /** Convert from x offset to the byte index of the corresponding
   * character within the text of the layout. If @a x_pos  is outside the line,
   * the start or end of the line will be stored at @a index .
   * @param x_pos The x offset (in thousands of a device unit)
   * from the left edge of the line.
   * @param index_ Location to store calculated byte offset for
   * the grapheme in which the user clicked.
   * @param trailing Location to store a integer indicating where
   * in the grapheme the user clicked. It will either
   * be zero, or the number of characters in the
   * grapheme. 0 represents the trailing edge of the cluster.
   * @return <tt>false</tt> if @a x_pos  was outside the line, <tt>true</tt> if inside.
   */
  bool x_to_index(int x_pos, int& index, int& trailing) const;

  /** Converts an index within a line to a @a x position.
   * @param index Byte offset of a grapheme within the layout.
   * @param trailing  An boolean indicating the edge of the grapheme to retrieve the position of. If <tt>false</tt>, the trailing edge of the grapheme, if <tt>true</tt> the leading of the grapheme. 
   * @return The x offset (in thousands of a device unit).
   */
  int index_to_x(int index, bool trailing) const;

  /** Get a list of visual ranges corresponding to a given logical range.
   * This list is not necessarily minimal - there may be consecutive ranges which are adjacent.
   * The ranges will be sorted from left to right. The ranges are with respect to the
   * left edge of the entire layout, not with respect to the line.
   * @param start_index The start byte index of the logical range.
   * If the value of @a start_index is less than the start index for the line,
   * then the first range will extend all the way to the leading edge of the layout.
   * Otherwise it will start at the leading edge of the first character.
   * @param end_index The end byte index of the logical range.
   * If the value of @a end_index is greater than the end index for the line,
   * then the last range will extend all the way to the trailing edge of the layout.
   * Otherwise, it will end at the trailing edge of the last character.
   * @return An array of ranges represented by pairs of integers marking the start and end pixel coordinates of the ranges.
   */
  Glib::ArrayHandle<std::pair<int,int> > get_x_ranges(int start_index, int end_index) const;

  
  /** Compute the logical and ink extents of a layout line. See the documentation
   * for Pango::Font::get_glyph_extents() for details about the interpretation
   * of the rectangles.
   * @param ink_rect Rectangle used to store the extents of the glyph string as drawn.
   * @param logical_rect Rectangle used to store the logical extents of the glyph string.
   */
  void get_extents(Rectangle& ink_rect, Rectangle& logical_rect) const;

  /** Compute the ink extents of a layout line.
   * @return The extents of the layout line as drawn.
   */
  Rectangle get_ink_extents() const;

  /** Compute the logical extents of a layout line.
   * @return The logical extents of the layout line.
   */
  Rectangle get_logical_extents() const;

  
  /** Compute the logical and ink extents of a layout line. See the documentation
   * for Pango::Font::get_glyph_extents() for details about the interpretation
   * of the rectangles. The returned rectangles are in device units, as
   * opposed to pango_layout_line_get_extents(), which returns the extents in
   * units of device unit / PANGO_SCALE.
   * @param ink_rect Rectangle used to store the extents of the glyph string as drawn.
   * @param logical_rect Rectangle used to store the logical extents of the glyph string.
   */
  void get_pixel_extents(Rectangle& ink_rect, Rectangle& logical_rect) const;

  /** Compute the ink extents of a layout line in device units.
   * @return The extents of the layout line as drawn.
   */
  Rectangle get_pixel_ink_extents() const;

  /** Compute the logical extents of a layout line in device units.
   * @return The logical extents of the layout line.
   */
  Rectangle get_pixel_logical_extents() const;


};

} // namespace Pango


#ifndef DOXYGEN_SHOULD_SKIP_THIS
namespace Glib
{
// forward declaration needed by LayoutLineTraits
Glib::RefPtr<Pango::LayoutLine> wrap(PangoLayoutLine* object, bool take_copy /* = false */);

} // namespace Glib
#endif /* DOXYGEN_SHOULD_SKIP_THIS */


namespace Pango
{

struct LayoutLineTraits
{
  typedef Glib::RefPtr<LayoutLine>  CppType;
  typedef PangoLayoutLine *         CType;
  typedef PangoLayoutLine *         CTypeNonConst;

  static CType   to_c_type      (const CppType& ptr) { return Glib::unwrap(ptr);     }
  static CType   to_c_type      (CType          ptr) { return ptr;                   }
  static CppType to_cpp_type    (CType          ptr) { return Glib::wrap(ptr, true); }
  static void    release_c_type (CType          ptr) { pango_layout_line_unref(ptr); }
};

typedef Glib::SListHandle< Glib::RefPtr<LayoutLine>, LayoutLineTraits > SListHandle_LayoutLine;

} // namespace Pango


namespace Glib
{

/** @relates Pango::LayoutLine */
Glib::RefPtr<Pango::LayoutLine> wrap(PangoLayoutLine* object, bool take_copy = false);

} // namespace Glib

#endif /* _PANGOMM_LAYOUTLINE_H */

