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151 lines
6.1 KiB
Text
151 lines
6.1 KiB
Text
/* $Id: layoutline.hg,v 1.5 2006/05/30 17:14:21 murrayc Exp $ */
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/* layoutline.h
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*
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* Copyright (C) 1998-1999 The gtkmm Development Team
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <glibmm/slisthandle.h> // For the Glib::SListHandle typedef
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#include <pangomm/rectangle.h>
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#include <cairomm/context.h>
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#include <pango/pango-layout.h>
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_DEFS(pangomm,pango)
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namespace Pango
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{
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class Layout;
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/** A Pango::LayoutLine represents one of the lines resulting from laying out a paragraph via Pango::Layout.
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* Pango::LayoutLine objects are obtained by calling Pango::Layout::get_line()
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* and are only valid until the text, attributes, or settings of the parent Pango::Layout are modified.
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* Routines for rendering Pango::Layout objects are provided in code specific to each rendering system.
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*/
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class LayoutLine
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{
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_CLASS_OPAQUE_REFCOUNTED(LayoutLine, PangoLayoutLine, NONE, pango_layout_line_ref, pango_layout_line_unref)
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_IGNORE(pango_layout_line_ref, pango_layout_line_unref)
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_IGNORE(pango_layout_line_get_x_ranges)
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public:
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_WRAP_METHOD(bool x_to_index(int x_pos, int& index, int& trailing) const, pango_layout_line_x_to_index)
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/** Converts an index within a line to a @a x position.
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* @param index Byte offset of a grapheme within the layout.
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* @param trailing A 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.
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* @return The x offset (in thousands of a device unit).
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*/
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int index_to_x(int index, bool trailing) const;
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_IGNORE(pango_layout_line_index_to_x)
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/** Get a list of visual ranges corresponding to a given logical range.
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* This list is not necessarily minimal - there may be consecutive ranges which are adjacent.
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* The ranges will be sorted from left to right. The ranges are with respect to the
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* left edge of the entire layout, not with respect to the line.
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* @param start_index The start byte index of the logical range.
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* If the value of @a start_index is less than the start index for the line,
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* then the first range will extend all the way to the leading edge of the layout.
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* Otherwise it will start at the leading edge of the first character.
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* @param end_index The end byte index of the logical range.
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* If the value of @a end_index is greater than the end index for the line,
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* then the last range will extend all the way to the trailing edge of the layout.
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* Otherwise, it will end at the trailing edge of the last character.
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* @return An array of ranges represented by pairs of integers marking the start and end pixel coordinates of the ranges.
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*/
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Glib::ArrayHandle<std::pair<int,int> > get_x_ranges(int start_index, int end_index) const;
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_WRAP_METHOD(void get_extents(Rectangle& ink_rect, Rectangle& logical_rect) const, pango_layout_line_get_extents)
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/** Compute the ink extents of a layout line.
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* @return The extents of the layout line as drawn.
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*/
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Rectangle get_ink_extents() const;
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/** Compute the logical extents of a layout line.
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* @return The logical extents of the layout line.
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*/
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Rectangle get_logical_extents() const;
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_WRAP_METHOD(void get_pixel_extents(Rectangle& ink_rect, Rectangle& logical_rect) const, pango_layout_line_get_pixel_extents)
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/** Compute the ink extents of a layout line in device units.
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* @return The extents of the layout line as drawn.
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*/
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Rectangle get_pixel_ink_extents() const;
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/** Compute the logical extents of a layout line in device units.
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* @return The logical extents of the layout line.
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*/
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Rectangle get_pixel_logical_extents() const;
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/** Draws this LayoutLine in the specified Cairo context.
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* The origin of the glyphs (the left edge of the line) will
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* be drawn at the current point of the cairo context.
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*
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* @param context A Cairo context.
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*/
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void show_in_cairo_context(const Cairo::RefPtr<Cairo::Context>& context);
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/** Adds the text in this LayoutLine to the current path in the
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* specified Cairo @a context. The origin of the glyphs (the left edge
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* of the line) will be at the current point of the cairo context.
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*
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* @param context A Cairo context.
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*/
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void add_to_cairo_context(const Cairo::RefPtr<Cairo::Context>& context);
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_MEMBER_GET_GOBJECT(layout, layout, Pango::Layout, PangoLayout*)
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//_MEMBER_SET_GOBJECT(layout, layout, Pango::Layout, PangoLayout*)
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_MEMBER_GET(length, length, int, gint)
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_MEMBER_GET(start_index, start_index, int, gint)
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};
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} // namespace Pango
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#ifndef DOXYGEN_SHOULD_SKIP_THIS
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namespace Glib
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{
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// forward declaration needed by LayoutLineTraits
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Glib::RefPtr<Pango::LayoutLine> wrap(PangoLayoutLine* object, bool take_copy /* = false */);
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} // namespace Glib
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#endif /* DOXYGEN_SHOULD_SKIP_THIS */
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namespace Pango
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{
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struct LayoutLineTraits
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{
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typedef Glib::RefPtr<LayoutLine> CppType;
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typedef PangoLayoutLine * CType;
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typedef PangoLayoutLine * CTypeNonConst;
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static CType to_c_type (const CppType& ptr) { return Glib::unwrap(ptr); }
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static CType to_c_type (CType ptr) { return ptr; }
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static CppType to_cpp_type (CType ptr) { return Glib::wrap(ptr, true); }
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static void release_c_type (CType ptr) { pango_layout_line_unref(ptr); }
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};
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typedef Glib::SListHandle< Glib::RefPtr<LayoutLine>, LayoutLineTraits > SListHandle_LayoutLine;
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typedef Glib::SListHandle< Glib::RefPtr<const LayoutLine>, LayoutLineTraits > SListHandle_ConstLayoutLine;
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} // namespace Pango
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