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478 lines
20 KiB
C
478 lines
20 KiB
C
/* GTK - The GIMP Toolkit
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* gtktextlayout.h
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*
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* Copyright (c) 1992-1994 The Regents of the University of California.
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* Copyright (c) 1994-1997 Sun Microsystems, Inc.
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* Copyright (c) 2000 Red Hat, Inc.
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* Tk->Gtk port by Havoc Pennington
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* Pango support by Owen Taylor
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*
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* This file can be used under your choice of two licenses, the LGPL
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* and the original Tk license.
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*
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* LGPL:
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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 Lesser 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Original Tk license:
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*
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* This software is copyrighted by the Regents of the University of
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* California, Sun Microsystems, Inc., and other parties. The
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* following terms apply to all files associated with the software
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* unless explicitly disclaimed in individual files.
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*
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* The authors hereby grant permission to use, copy, modify,
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* distribute, and license this software and its documentation for any
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* purpose, provided that existing copyright notices are retained in
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* all copies and that this notice is included verbatim in any
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* distributions. No written agreement, license, or royalty fee is
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* required for any of the authorized uses. Modifications to this
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* software may be copyrighted by their authors and need not follow
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* the licensing terms described here, provided that the new terms are
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* clearly indicated on the first page of each file where they apply.
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*
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* IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY
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* PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
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* DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION,
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* OR ANY DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
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* NON-INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS,
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* AND THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE
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* MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* GOVERNMENT USE: If you are acquiring this software on behalf of the
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* U.S. government, the Government shall have only "Restricted Rights"
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* in the software and related documentation as defined in the Federal
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* Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2). If you
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* are acquiring the software on behalf of the Department of Defense,
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* the software shall be classified as "Commercial Computer Software"
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* and the Government shall have only "Restricted Rights" as defined
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* in Clause 252.227-7013 (c) (1) of DFARs. Notwithstanding the
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* foregoing, the authors grant the U.S. Government and others acting
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* in its behalf permission to use and distribute the software in
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* accordance with the terms specified in this license.
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*
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*/
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/*
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* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GTK+ Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#ifndef __GTK_TEXT_LAYOUT_H__
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#define __GTK_TEXT_LAYOUT_H__
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/* This is a "semi-private" header; it is intended for
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* use by the text widget, and the text canvas item,
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* but that's all. We may have to install it so the
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* canvas item can use it, but users are not supposed
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* to use it.
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*/
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#ifndef GTK_TEXT_USE_INTERNAL_UNSUPPORTED_API
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#error "You are not supposed to be including this file; the equivalent public API is in gtktextview.h"
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#endif
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#include <gtk/gtk.h>
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G_BEGIN_DECLS
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/* forward declarations that have to be here to avoid including
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* gtktextbtree.h
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*/
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typedef struct _GtkTextLine GtkTextLine;
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typedef struct _GtkTextLineData GtkTextLineData;
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#define GTK_TYPE_TEXT_LAYOUT (gtk_text_layout_get_type ())
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#define GTK_TEXT_LAYOUT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_TEXT_LAYOUT, GtkTextLayout))
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#define GTK_TEXT_LAYOUT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_TEXT_LAYOUT, GtkTextLayoutClass))
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#define GTK_IS_TEXT_LAYOUT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_TEXT_LAYOUT))
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#define GTK_IS_TEXT_LAYOUT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_TEXT_LAYOUT))
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#define GTK_TEXT_LAYOUT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_TEXT_LAYOUT, GtkTextLayoutClass))
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typedef struct _GtkTextLayout GtkTextLayout;
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typedef struct _GtkTextLayoutClass GtkTextLayoutClass;
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typedef struct _GtkTextLineDisplay GtkTextLineDisplay;
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typedef struct _GtkTextAttrAppearance GtkTextAttrAppearance;
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struct _GtkTextLayout
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{
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GObject parent_instance;
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/* width of the display area on-screen,
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* i.e. pixels we should wrap to fit inside. */
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gint screen_width;
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/* width/height of the total logical area being layed out */
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gint width;
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gint height;
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/* Pixel offsets from the left and from the top to be used when we
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* draw; these allow us to create left/top margins. We don't need
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* anything special for bottom/right margins, because those don't
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* affect drawing.
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*/
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/* gint left_edge; */
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/* gint top_edge; */
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GtkTextBuffer *buffer;
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/* Default style used if no tags override it */
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GtkTextAttributes *default_style;
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/* Pango contexts used for creating layouts */
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PangoContext *ltr_context;
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PangoContext *rtl_context;
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/* A cache of one style; this is used to ensure
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* we don't constantly regenerate the style
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* over long runs with the same style. */
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GtkTextAttributes *one_style_cache;
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/* A cache of one line display. Getting the same line
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* many times in a row is the most common case.
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*/
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GtkTextLineDisplay *one_display_cache;
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/* Whether we are allowed to wrap right now */
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gint wrap_loop_count;
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/* Whether to show the insertion cursor */
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guint cursor_visible : 1;
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/* For what GtkTextDirection to draw cursor GTK_TEXT_DIR_NONE -
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* means draw both cursors.
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*/
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guint cursor_direction : 2;
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/* The keyboard direction is used to default the alignment when
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there are no strong characters.
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*/
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guint keyboard_direction : 2;
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/* The preedit string and attributes, if any */
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gchar *preedit_string;
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PangoAttrList *preedit_attrs;
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gint preedit_len;
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gint preedit_cursor;
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guint overwrite_mode : 1;
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};
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struct _GtkTextLayoutClass
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{
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GObjectClass parent_class;
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/* Some portion of the layout was invalidated
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*/
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void (*invalidated) (GtkTextLayout *layout);
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/* A range of the layout changed appearance and possibly height
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*/
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void (*changed) (GtkTextLayout *layout,
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gint y,
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gint old_height,
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gint new_height);
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GtkTextLineData* (*wrap) (GtkTextLayout *layout,
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GtkTextLine *line,
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GtkTextLineData *line_data); /* may be NULL */
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void (*get_log_attrs) (GtkTextLayout *layout,
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GtkTextLine *line,
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PangoLogAttr **attrs,
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gint *n_attrs);
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void (*invalidate) (GtkTextLayout *layout,
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const GtkTextIter *start,
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const GtkTextIter *end);
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void (*free_line_data) (GtkTextLayout *layout,
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GtkTextLine *line,
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GtkTextLineData *line_data);
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void (*allocate_child) (GtkTextLayout *layout,
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GtkWidget *child,
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gint x,
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gint y);
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void (*invalidate_cursors) (GtkTextLayout *layout,
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const GtkTextIter *start,
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const GtkTextIter *end);
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/* Padding for future expansion */
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void (*_gtk_reserved1) (void);
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void (*_gtk_reserved2) (void);
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void (*_gtk_reserved3) (void);
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};
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struct _GtkTextAttrAppearance
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{
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PangoAttribute attr;
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GtkTextAppearance appearance;
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};
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struct _GtkTextLineDisplay
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{
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PangoLayout *layout;
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GArray *cursors; /* indexes of cursors in the PangoLayout */
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GtkTextDirection direction;
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gint width; /* Width of layout */
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gint total_width; /* width - margins, if no width set on layout, if width set on layout, -1 */
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gint height;
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/* Amount layout is shifted from left edge - this is the left margin
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* plus any other factors, such as alignment or indentation.
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*/
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gint x_offset;
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gint left_margin;
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gint right_margin;
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gint top_margin;
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gint bottom_margin;
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gint insert_index; /* Byte index of insert cursor within para or -1 */
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GtkTextLine *line;
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GdkColor *pg_bg_color;
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GdkRectangle block_cursor;
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guint cursors_invalid : 1;
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guint has_block_cursor : 1;
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guint cursor_at_line_end : 1;
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guint size_only : 1;
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GdkRGBA *pg_bg_rgba;
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};
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#ifdef GTK_COMPILATION
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extern G_GNUC_INTERNAL PangoAttrType gtk_text_attr_appearance_type;
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#endif
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GDK_AVAILABLE_IN_ALL
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GType gtk_text_layout_get_type (void) G_GNUC_CONST;
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GDK_AVAILABLE_IN_ALL
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GtkTextLayout* gtk_text_layout_new (void);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_set_buffer (GtkTextLayout *layout,
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GtkTextBuffer *buffer);
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GDK_AVAILABLE_IN_ALL
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GtkTextBuffer *gtk_text_layout_get_buffer (GtkTextLayout *layout);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_set_default_style (GtkTextLayout *layout,
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GtkTextAttributes *values);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_set_contexts (GtkTextLayout *layout,
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PangoContext *ltr_context,
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PangoContext *rtl_context);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_set_cursor_direction (GtkTextLayout *layout,
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GtkTextDirection direction);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_set_overwrite_mode (GtkTextLayout *layout,
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gboolean overwrite);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_set_keyboard_direction (GtkTextLayout *layout,
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GtkTextDirection keyboard_dir);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_default_style_changed (GtkTextLayout *layout);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_set_screen_width (GtkTextLayout *layout,
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gint width);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_set_preedit_string (GtkTextLayout *layout,
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const gchar *preedit_string,
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PangoAttrList *preedit_attrs,
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gint cursor_pos);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_set_cursor_visible (GtkTextLayout *layout,
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gboolean cursor_visible);
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GDK_AVAILABLE_IN_ALL
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gboolean gtk_text_layout_get_cursor_visible (GtkTextLayout *layout);
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/* Getting the size or the lines potentially results in a call to
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* recompute, which is pretty massively expensive. Thus it should
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* basically only be done in an idle handler.
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*
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* Long-term, we would really like to be able to do these without
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* a full recompute so they may get cheaper over time.
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*/
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_get_size (GtkTextLayout *layout,
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gint *width,
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gint *height);
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GDK_AVAILABLE_IN_ALL
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GSList* gtk_text_layout_get_lines (GtkTextLayout *layout,
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/* [top_y, bottom_y) */
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gint top_y,
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gint bottom_y,
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gint *first_line_y);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_wrap_loop_start (GtkTextLayout *layout);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_wrap_loop_end (GtkTextLayout *layout);
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GDK_AVAILABLE_IN_ALL
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GtkTextLineDisplay* gtk_text_layout_get_line_display (GtkTextLayout *layout,
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GtkTextLine *line,
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gboolean size_only);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_free_line_display (GtkTextLayout *layout,
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GtkTextLineDisplay *display);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_get_line_at_y (GtkTextLayout *layout,
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GtkTextIter *target_iter,
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gint y,
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gint *line_top);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_get_iter_at_pixel (GtkTextLayout *layout,
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GtkTextIter *iter,
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gint x,
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gint y);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_get_iter_at_position (GtkTextLayout *layout,
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GtkTextIter *iter,
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gint *trailing,
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gint x,
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gint y);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_invalidate (GtkTextLayout *layout,
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const GtkTextIter *start,
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const GtkTextIter *end);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_invalidate_cursors(GtkTextLayout *layout,
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const GtkTextIter *start,
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const GtkTextIter *end);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_free_line_data (GtkTextLayout *layout,
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GtkTextLine *line,
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GtkTextLineData *line_data);
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GDK_AVAILABLE_IN_ALL
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gboolean gtk_text_layout_is_valid (GtkTextLayout *layout);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_validate_yrange (GtkTextLayout *layout,
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GtkTextIter *anchor_line,
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gint y0_,
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gint y1_);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_validate (GtkTextLayout *layout,
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gint max_pixels);
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/* This function should return the passed-in line data,
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* OR remove the existing line data from the line, and
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* return a NEW line data after adding it to the line.
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* That is, invariant after calling the callback is that
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* there should be exactly one line data for this view
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* stored on the btree line.
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*/
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GDK_AVAILABLE_IN_ALL
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GtkTextLineData* gtk_text_layout_wrap (GtkTextLayout *layout,
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GtkTextLine *line,
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GtkTextLineData *line_data); /* may be NULL */
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_changed (GtkTextLayout *layout,
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gint y,
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gint old_height,
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gint new_height);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_cursors_changed (GtkTextLayout *layout,
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gint y,
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gint old_height,
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gint new_height);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_get_iter_location (GtkTextLayout *layout,
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const GtkTextIter *iter,
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GdkRectangle *rect);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_get_line_yrange (GtkTextLayout *layout,
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const GtkTextIter *iter,
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gint *y,
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gint *height);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_get_cursor_locations (GtkTextLayout *layout,
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GtkTextIter *iter,
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GdkRectangle *strong_pos,
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GdkRectangle *weak_pos);
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gboolean _gtk_text_layout_get_block_cursor (GtkTextLayout *layout,
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GdkRectangle *pos);
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GDK_AVAILABLE_IN_ALL
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gboolean gtk_text_layout_clamp_iter_to_vrange (GtkTextLayout *layout,
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GtkTextIter *iter,
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gint top,
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gint bottom);
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GDK_AVAILABLE_IN_ALL
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gboolean gtk_text_layout_move_iter_to_line_end (GtkTextLayout *layout,
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GtkTextIter *iter,
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gint direction);
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GDK_AVAILABLE_IN_ALL
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gboolean gtk_text_layout_move_iter_to_previous_line (GtkTextLayout *layout,
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GtkTextIter *iter);
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GDK_AVAILABLE_IN_ALL
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gboolean gtk_text_layout_move_iter_to_next_line (GtkTextLayout *layout,
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GtkTextIter *iter);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_move_iter_to_x (GtkTextLayout *layout,
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GtkTextIter *iter,
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gint x);
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GDK_AVAILABLE_IN_ALL
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gboolean gtk_text_layout_move_iter_visually (GtkTextLayout *layout,
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GtkTextIter *iter,
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gint count);
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GDK_AVAILABLE_IN_ALL
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gboolean gtk_text_layout_iter_starts_line (GtkTextLayout *layout,
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const GtkTextIter *iter);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_get_iter_at_line (GtkTextLayout *layout,
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GtkTextIter *iter,
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GtkTextLine *line,
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gint byte_offset);
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/* Don't use these. Use gtk_text_view_add_child_at_anchor().
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* These functions are defined in gtktextchild.c, but here
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* since they are semi-public and require GtkTextLayout to
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* be declared.
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*/
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GDK_AVAILABLE_IN_ALL
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void gtk_text_child_anchor_register_child (GtkTextChildAnchor *anchor,
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GtkWidget *child,
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GtkTextLayout *layout);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_child_anchor_unregister_child (GtkTextChildAnchor *anchor,
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GtkWidget *child);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_child_anchor_queue_resize (GtkTextChildAnchor *anchor,
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GtkTextLayout *layout);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_anchored_child_set_layout (GtkWidget *child,
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GtkTextLayout *layout);
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GDK_AVAILABLE_IN_ALL
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void gtk_text_layout_spew (GtkTextLayout *layout);
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G_END_DECLS
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#endif /* __GTK_TEXT_LAYOUT_H__ */
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