mirror of https://gitee.com/openkylin/cwidget.git
87 lines
2.8 KiB
C++
87 lines
2.8 KiB
C++
// fragment_cache.h -*-c++-*-
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//
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// Copyright (C) 2005 Daniel Burrows
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of
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// the License, or (at your option) any later version.
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//
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// This program 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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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; see the file COPYING. If not, write to
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// the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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// Boston, MA 02111-1307, USA.
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//
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// A special fragment class that caches its contents.
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#ifndef FRAGMENT_CACHE_H
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#define FRAGMENT_CACHE_H
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#include "fragment.h"
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namespace cwidget
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{
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/** A fragment that caches its contents; a cached result is used if
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* the same width is passed to the layout routine twice in a row.
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* Obviously this should only be done if you know that the contents
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* are static.
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*/
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class fragment_cache:public fragment
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{
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fragment *contents;
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/** The last cached result. */
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mutable fragment_contents cached_lines;
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/** If cached_lines is valid, it was formatted in this style: */
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mutable style cached_lines_style;
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/** If cached_lines is valid, cached_lines was formatted for these
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* widths.
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*/
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mutable size_t cached_lines_first_width, cached_lines_rest_width;
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/** The cached max_width value. */
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mutable size_t cached_max_width;
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/** For what indents is cached_max_width valid? */
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mutable size_t cached_max_width_first_indent, cached_max_width_rest_indent;
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/** The cached trailing_width value. */
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mutable size_t cached_trailing_width;
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/** For what indents is cached_trailing_width valid? */
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mutable size_t cached_trailing_width_first_indent, cached_trailing_width_rest_indent;
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/** The cached final_newline value. */
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mutable bool cached_final_nl:1;
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/** If \b true, the corresponding property is valid. */
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mutable bool cached_lines_valid:1, cached_max_width_valid:1;
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/** If \b true, the corresponding property is valid. */
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mutable bool cached_trailing_width_valid:1, cached_final_nl_valid:1;
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public:
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fragment_cache(fragment *_contents);
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~fragment_cache();
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void invalidate();
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fragment_contents layout(size_t firstw, size_t restw,
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const style &st);
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void set_attr(int attr);
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size_t max_width(size_t first_indent, size_t rest_indent) const;
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size_t trailing_width(size_t first_indent, size_t rest_indent) const;
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bool final_newline() const;
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};
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}
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#endif
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