/* GTK - The GIMP Toolkit * gtktextlayout.c - calculate the layout of the text * * Copyright (c) 1992-1994 The Regents of the University of California. * Copyright (c) 1994-1997 Sun Microsystems, Inc. * Copyright (c) 2000 Red Hat, Inc. * Tk->Gtk port by Havoc Pennington * Pango support by Owen Taylor * * This file can be used under your choice of two licenses, the LGPL * and the original Tk license. * * LGPL: * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * Original Tk license: * * This software is copyrighted by the Regents of the University of * California, Sun Microsystems, Inc., and other parties. The * following terms apply to all files associated with the software * unless explicitly disclaimed in individual files. * * The authors hereby grant permission to use, copy, modify, * distribute, and license this software and its documentation for any * purpose, provided that existing copyright notices are retained in * all copies and that this notice is included verbatim in any * distributions. No written agreement, license, or royalty fee is * required for any of the authorized uses. Modifications to this * software may be copyrighted by their authors and need not follow * the licensing terms described here, provided that the new terms are * clearly indicated on the first page of each file where they apply. * * IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL * DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION, * OR ANY DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * * THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND * NON-INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, * AND THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE * MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. * * GOVERNMENT USE: If you are acquiring this software on behalf of the * U.S. government, the Government shall have only "Restricted Rights" * in the software and related documentation as defined in the Federal * Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2). If you * are acquiring the software on behalf of the Department of Defense, * the software shall be classified as "Commercial Computer Software" * and the Government shall have only "Restricted Rights" as defined * in Clause 252.227-7013 (c) (1) of DFARs. Notwithstanding the * foregoing, the authors grant the U.S. Government and others acting * in its behalf permission to use and distribute the software in * accordance with the terms specified in this license. * */ /* * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS * file for a list of people on the GTK+ Team. See the ChangeLog * files for a list of changes. These files are distributed with * GTK+ at ftp://ftp.gtk.org/pub/gtk/. */ #include "gtksignal.h" #include "gtktextlayout.h" #include "gtktextbtree.h" #include "gtktextiterprivate.h" #include #include static GtkTextLineData *gtk_text_line_data_new (GtkTextLayout *layout, GtkTextLine *line); static GtkTextLineData *gtk_text_layout_real_wrap (GtkTextLayout *layout, GtkTextLine *line, /* may be NULL */ GtkTextLineData *line_data); static void gtk_text_layout_invalidated (GtkTextLayout *layout); static void gtk_text_layout_real_invalidate (GtkTextLayout *layout, const GtkTextIter *start, const GtkTextIter *end); static void gtk_text_layout_invalidate_cache (GtkTextLayout *layout, GtkTextLine *line); static void gtk_text_layout_invalidate_cursor_line (GtkTextLayout *layout); static void gtk_text_layout_real_free_line_data (GtkTextLayout *layout, GtkTextLine *line, GtkTextLineData *line_data); static void gtk_text_layout_invalidate_all (GtkTextLayout *layout); static PangoAttribute *gtk_text_attr_appearance_new (const GtkTextAppearance *appearance); enum { INVALIDATED, CHANGED, ALLOCATE_CHILD, LAST_SIGNAL }; enum { ARG_0, LAST_ARG }; static void gtk_text_layout_init (GtkTextLayout *text_layout); static void gtk_text_layout_class_init (GtkTextLayoutClass *klass); static void gtk_text_layout_finalize (GObject *object); static GtkObjectClass *parent_class = NULL; static guint signals[LAST_SIGNAL] = { 0 }; PangoAttrType gtk_text_attr_appearance_type = 0; GType gtk_text_layout_get_type (void) { static GType our_type = 0; if (our_type == 0) { static const GTypeInfo our_info = { sizeof (GtkTextLayoutClass), (GBaseInitFunc) NULL, (GBaseFinalizeFunc) NULL, (GClassInitFunc) gtk_text_layout_class_init, NULL, /* class_finalize */ NULL, /* class_data */ sizeof (GtkTextLayout), 0, /* n_preallocs */ (GInstanceInitFunc) gtk_text_layout_init }; our_type = g_type_register_static (G_TYPE_OBJECT, "GtkTextLayout", &our_info, 0); } return our_type; } static void gtk_text_layout_class_init (GtkTextLayoutClass *klass) { GObjectClass *object_class = G_OBJECT_CLASS (klass); parent_class = g_type_class_peek_parent (klass); object_class->finalize = gtk_text_layout_finalize; klass->wrap = gtk_text_layout_real_wrap; klass->invalidate = gtk_text_layout_real_invalidate; klass->free_line_data = gtk_text_layout_real_free_line_data; signals[INVALIDATED] = g_signal_newc ("invalidated", G_OBJECT_CLASS_TYPE (object_class), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GtkTextLayoutClass, invalidated), NULL, NULL, gtk_marshal_VOID__VOID, GTK_TYPE_NONE, 0); signals[CHANGED] = g_signal_newc ("changed", G_OBJECT_CLASS_TYPE (object_class), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GtkTextLayoutClass, changed), NULL, NULL, gtk_marshal_VOID__INT_INT_INT, GTK_TYPE_NONE, 3, GTK_TYPE_INT, GTK_TYPE_INT, GTK_TYPE_INT); signals[ALLOCATE_CHILD] = g_signal_newc ("allocate_child", G_OBJECT_CLASS_TYPE (object_class), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GtkTextLayoutClass, allocate_child), NULL, NULL, gtk_marshal_VOID__OBJECT_INT_INT, GTK_TYPE_NONE, 3, GTK_TYPE_OBJECT, GTK_TYPE_INT, GTK_TYPE_INT); } void gtk_text_layout_init (GtkTextLayout *text_layout) { text_layout->cursor_visible = TRUE; } GtkTextLayout* gtk_text_layout_new (void) { return GTK_TEXT_LAYOUT (g_object_new (gtk_text_layout_get_type (), NULL)); } static void free_style_cache (GtkTextLayout *text_layout) { if (text_layout->one_style_cache) { gtk_text_attributes_unref (text_layout->one_style_cache); text_layout->one_style_cache = NULL; } } static void gtk_text_layout_finalize (GObject *object) { GtkTextLayout *layout; layout = GTK_TEXT_LAYOUT (object); gtk_text_layout_set_buffer (layout, NULL); if (layout->default_style) gtk_text_attributes_unref (layout->default_style); layout->default_style = NULL; if (layout->ltr_context) { g_object_unref (G_OBJECT (layout->ltr_context)); layout->ltr_context = NULL; } if (layout->rtl_context) { g_object_unref (G_OBJECT (layout->rtl_context)); layout->rtl_context = NULL; } (* G_OBJECT_CLASS (parent_class)->finalize) (object); } void gtk_text_layout_set_buffer (GtkTextLayout *layout, GtkTextBuffer *buffer) { g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout)); g_return_if_fail (buffer == NULL || GTK_IS_TEXT_BUFFER (buffer)); if (layout->buffer == buffer) return; free_style_cache (layout); if (layout->buffer) { _gtk_text_btree_remove_view (_gtk_text_buffer_get_btree (layout->buffer), layout); g_object_unref (G_OBJECT (layout->buffer)); layout->buffer = NULL; } if (buffer) { layout->buffer = buffer; g_object_ref (G_OBJECT (buffer)); _gtk_text_btree_add_view (_gtk_text_buffer_get_btree (buffer), layout); } } void gtk_text_layout_default_style_changed (GtkTextLayout *layout) { g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout)); gtk_text_layout_invalidate_all (layout); } void gtk_text_layout_set_default_style (GtkTextLayout *layout, GtkTextAttributes *values) { g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout)); g_return_if_fail (values != NULL); if (values == layout->default_style) return; gtk_text_attributes_ref (values); if (layout->default_style) gtk_text_attributes_unref (layout->default_style); layout->default_style = values; gtk_text_layout_default_style_changed (layout); } void gtk_text_layout_set_contexts (GtkTextLayout *layout, PangoContext *ltr_context, PangoContext *rtl_context) { g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout)); if (layout->ltr_context) g_object_unref (G_OBJECT (ltr_context)); layout->ltr_context = ltr_context; g_object_ref (G_OBJECT (ltr_context)); if (layout->rtl_context) g_object_unref (G_OBJECT (rtl_context)); layout->rtl_context = rtl_context; g_object_ref (G_OBJECT (rtl_context)); gtk_text_layout_invalidate_all (layout); } /** * gtk_text_layout_set_cursor_direction: * @direction: the new direction(s) for which to draw cursors. * %GTK_TEXT_DIR_NONE means draw cursors for both * left-to-right insertion and right-to-left insertion. * (The two cursors will be visually distinguished.) * * Sets which text directions (left-to-right and/or right-to-left) for * which cursors will be drawn for the insertion point. The visual * point at which new text is inserted depends on whether the new * text is right-to-left or left-to-right, so it may be desired to * make the drawn position of the cursor depend on the keyboard state. **/ void gtk_text_layout_set_cursor_direction (GtkTextLayout *layout, GtkTextDirection direction) { if (direction != layout->cursor_direction) { layout->cursor_direction = direction; gtk_text_layout_invalidate_cursor_line (layout); } } void gtk_text_layout_set_screen_width (GtkTextLayout *layout, gint width) { g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout)); g_return_if_fail (width >= 0); g_return_if_fail (layout->wrap_loop_count == 0); if (layout->screen_width == width) return; layout->screen_width = width; gtk_text_layout_invalidate_all (layout); } /** * gtk_text_layout_set_cursor_visible: * @layout: a #GtkTextLayout * @cursor_visible: If %FALSE, then the insertion cursor will not * be shown, even if the text is editable. * * Sets whether the insertion cursor should be shown. Generally, * widgets using #GtkTextLayout will hide the cursor when the * widget does not have the input focus. **/ void gtk_text_layout_set_cursor_visible (GtkTextLayout *layout, gboolean cursor_visible) { cursor_visible = (cursor_visible != FALSE); if (layout->cursor_visible != cursor_visible) { GtkTextIter iter; gint y, height; layout->cursor_visible = cursor_visible; /* Now queue a redraw on the paragraph containing the cursor */ gtk_text_buffer_get_iter_at_mark (layout->buffer, &iter, gtk_text_buffer_get_mark (layout->buffer, "insert")); gtk_text_layout_get_line_yrange (layout, &iter, &y, &height); gtk_text_layout_changed (layout, y, height, height); gtk_text_layout_invalidate_cache (layout, _gtk_text_iter_get_text_line (&iter)); } } /** * gtk_text_layout_get_cursor_visible: * @layout: a #GtkTextLayout * * Returns whether the insertion cursor will be shown. * * Return value: if %FALSE, the insertion cursor will not be shown, even if the text is editable. **/ gboolean gtk_text_layout_get_cursor_visible (GtkTextLayout *layout) { return layout->cursor_visible; } /** * gtk_text_layout_set_preedit_string: * @layout: a #PangoLayout * @preedit_string: a string to display at the insertion point * @preedit_attrs: a #PangoAttrList of attributes that apply to @preedit_string * @cursor_pos: position of cursor within preedit string in chars * * Set the preedit string and attributes. The preedit string is a * string showing text that is currently being edited and not * yet committed into the buffer. **/ void gtk_text_layout_set_preedit_string (GtkTextLayout *layout, const gchar *preedit_string, PangoAttrList *preedit_attrs, gint cursor_pos) { g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout)); g_return_if_fail (preedit_attrs != NULL || preedit_string == NULL); if (layout->preedit_string) g_free (layout->preedit_string); if (layout->preedit_attrs) pango_attr_list_unref (layout->preedit_attrs); if (preedit_string) { layout->preedit_string = g_strdup (preedit_string); layout->preedit_len = strlen (layout->preedit_string); pango_attr_list_ref (preedit_attrs); layout->preedit_attrs = preedit_attrs; cursor_pos = CLAMP (cursor_pos, 0, g_utf8_strlen (layout->preedit_string, -1)); layout->preedit_cursor = g_utf8_offset_to_pointer (layout->preedit_string, cursor_pos) - layout->preedit_string; } else { layout->preedit_string = NULL; layout->preedit_len = 0; layout->preedit_attrs = NULL; layout->preedit_cursor = 0; } gtk_text_layout_invalidate_cursor_line (layout); } void gtk_text_layout_get_size (GtkTextLayout *layout, gint *width, gint *height) { g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout)); if (width) *width = layout->width; if (height) *height = layout->height; } static void gtk_text_layout_invalidated (GtkTextLayout *layout) { g_signal_emit (G_OBJECT (layout), signals[INVALIDATED], 0); } void gtk_text_layout_changed (GtkTextLayout *layout, gint y, gint old_height, gint new_height) { g_signal_emit (G_OBJECT (layout), signals[CHANGED], 0, y, old_height, new_height); } void gtk_text_layout_free_line_data (GtkTextLayout *layout, GtkTextLine *line, GtkTextLineData *line_data) { (* GTK_TEXT_LAYOUT_GET_CLASS (layout)->free_line_data) (layout, line, line_data); } void gtk_text_layout_invalidate (GtkTextLayout *layout, const GtkTextIter *start_index, const GtkTextIter *end_index) { (* GTK_TEXT_LAYOUT_GET_CLASS (layout)->invalidate) (layout, start_index, end_index); } GtkTextLineData* gtk_text_layout_wrap (GtkTextLayout *layout, GtkTextLine *line, /* may be NULL */ GtkTextLineData *line_data) { return (* GTK_TEXT_LAYOUT_GET_CLASS (layout)->wrap) (layout, line, line_data); } GSList* gtk_text_layout_get_lines (GtkTextLayout *layout, /* [top_y, bottom_y) */ gint top_y, gint bottom_y, gint *first_line_y) { GtkTextLine *first_btree_line; GtkTextLine *last_btree_line; GtkTextLine *line; GSList *retval; g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), NULL); g_return_val_if_fail (bottom_y > top_y, NULL); retval = NULL; first_btree_line = _gtk_text_btree_find_line_by_y (_gtk_text_buffer_get_btree (layout->buffer), layout, top_y, first_line_y); if (first_btree_line == NULL) { /* off the bottom */ return NULL; } /* -1 since bottom_y is one past */ last_btree_line = _gtk_text_btree_find_line_by_y (_gtk_text_buffer_get_btree (layout->buffer), layout, bottom_y - 1, NULL); if (!last_btree_line) last_btree_line = _gtk_text_btree_get_line (_gtk_text_buffer_get_btree (layout->buffer), _gtk_text_btree_line_count (_gtk_text_buffer_get_btree (layout->buffer)) - 1, NULL); { GtkTextLineData *ld = _gtk_text_line_get_data (last_btree_line, layout); if (ld->height == 0) G_BREAKPOINT (); } g_assert (last_btree_line != NULL); line = first_btree_line; while (TRUE) { retval = g_slist_prepend (retval, line); if (line == last_btree_line) break; line = _gtk_text_line_next (line); } retval = g_slist_reverse (retval); return retval; } static void invalidate_cached_style (GtkTextLayout *layout) { free_style_cache (layout); } /* These should be called around a loop which wraps a CONTIGUOUS bunch * of display lines. If the lines aren't contiguous you can't call * these. */ void gtk_text_layout_wrap_loop_start (GtkTextLayout *layout) { g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout)); g_return_if_fail (layout->one_style_cache == NULL); layout->wrap_loop_count += 1; } void gtk_text_layout_wrap_loop_end (GtkTextLayout *layout) { g_return_if_fail (layout->wrap_loop_count > 0); layout->wrap_loop_count -= 1; if (layout->wrap_loop_count == 0) { /* We cache a some stuff if we're iterating over some lines wrapping * them. This cleans it up. */ /* Nuke our cached style */ invalidate_cached_style (layout); g_assert (layout->one_style_cache == NULL); } } static void gtk_text_layout_invalidate_all (GtkTextLayout *layout) { GtkTextIter start; GtkTextIter end; if (layout->buffer == NULL) return; gtk_text_buffer_get_bounds (layout->buffer, &start, &end); gtk_text_layout_invalidate (layout, &start, &end); } static void gtk_text_layout_invalidate_cache (GtkTextLayout *layout, GtkTextLine *line) { if (layout->one_display_cache && line == layout->one_display_cache->line) { GtkTextLineDisplay *tmp_display = layout->one_display_cache; layout->one_display_cache = NULL; gtk_text_layout_free_line_display (layout, tmp_display); } } /* Now invalidate the paragraph containing the cursor */ static void gtk_text_layout_invalidate_cursor_line (GtkTextLayout *layout) { GtkTextIter iter; GtkTextLine *line; GtkTextLineData *line_data; gtk_text_buffer_get_iter_at_mark (layout->buffer, &iter, gtk_text_buffer_get_mark (layout->buffer, "insert")); line = _gtk_text_iter_get_text_line (&iter); line_data = _gtk_text_line_get_data (line, layout); if (line_data) { gtk_text_layout_invalidate_cache (layout, line); _gtk_text_line_invalidate_wrap (line, line_data); gtk_text_layout_invalidated (layout); } } static void gtk_text_layout_real_invalidate (GtkTextLayout *layout, const GtkTextIter *start, const GtkTextIter *end) { GtkTextLine *line; GtkTextLine *last_line; g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout)); g_return_if_fail (layout->wrap_loop_count == 0); #if 0 gtk_text_view_index_spew (start_index, "invalidate start"); gtk_text_view_index_spew (end_index, "invalidate end"); #endif last_line = _gtk_text_iter_get_text_line (end); line = _gtk_text_iter_get_text_line (start); while (TRUE) { GtkTextLineData *line_data = _gtk_text_line_get_data (line, layout); if (line_data && (line != last_line || !gtk_text_iter_starts_line (end))) { gtk_text_layout_invalidate_cache (layout, line); _gtk_text_line_invalidate_wrap (line, line_data); } if (line == last_line) break; line = _gtk_text_line_next (line); } gtk_text_layout_invalidated (layout); } static void gtk_text_layout_real_free_line_data (GtkTextLayout *layout, GtkTextLine *line, GtkTextLineData *line_data) { if (layout->one_display_cache && line == layout->one_display_cache->line) { GtkTextLineDisplay *tmp_display = layout->one_display_cache; layout->one_display_cache = NULL; gtk_text_layout_free_line_display (layout, tmp_display); } g_free (line_data); } /** * gtk_text_layout_is_valid: * @layout: a #GtkTextLayout * * Check if there are any invalid regions in a #GtkTextLayout's buffer * * Return value: #TRUE if any invalid regions were found **/ gboolean gtk_text_layout_is_valid (GtkTextLayout *layout) { g_return_val_if_fail (layout != NULL, FALSE); g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), FALSE); return _gtk_text_btree_is_valid (_gtk_text_buffer_get_btree (layout->buffer), layout); } static void update_layout_size (GtkTextLayout *layout) { _gtk_text_btree_get_view_size (_gtk_text_buffer_get_btree (layout->buffer), layout, &layout->width, &layout->height); } /** * gtk_text_layout_validate_yrange: * @layout: a #GtkTextLayout * @anchor: iter pointing into a line that will be used as the * coordinate origin * @y0: offset from the top of the line pointed to by @anchor at * which to begin validation. (The offset here is in pixels * after validation.) * @y1: offset from the top of the line pointed to by @anchor at * which to end validation. (The offset here is in pixels * after validation.) * * Ensure that a region of a #GtkTextLayout is valid. The ::changed * signal will be emitted if any lines are validated. **/ void gtk_text_layout_validate_yrange (GtkTextLayout *layout, GtkTextIter *anchor, gint y0, gint y1) { GtkTextLine *line; GtkTextLine *first_line = NULL; GtkTextLine *last_line = NULL; gint seen; gint delta_height = 0; gint first_line_y = 0; /* Quiet GCC */ gint last_line_y = 0; /* Quiet GCC */ g_return_if_fail (layout != NULL); g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout)); if (y0 > 0) y0 = 0; if (y1 < 0) y1 = 0; /* Validate backwards from the anchor line to y0 */ line = _gtk_text_iter_get_text_line (anchor); seen = 0; while (line && seen < -y0) { GtkTextLineData *line_data = _gtk_text_line_get_data (line, layout); if (!line_data || !line_data->valid) { gint old_height = line_data ? line_data->height : 0; _gtk_text_btree_validate_line (_gtk_text_buffer_get_btree (layout->buffer), line, layout); line_data = _gtk_text_line_get_data (line, layout); delta_height += line_data->height - old_height; first_line = line; first_line_y = -seen; if (!last_line) { last_line = line; last_line_y = -seen + line_data->height; } } seen += line_data->height; line = _gtk_text_line_previous (line); } /* Validate forwards to y1 */ line = _gtk_text_iter_get_text_line (anchor); seen = 0; while (line && seen < y1) { GtkTextLineData *line_data = _gtk_text_line_get_data (line, layout); if (!line_data || !line_data->valid) { gint old_height = line_data ? line_data->height : 0; _gtk_text_btree_validate_line (_gtk_text_buffer_get_btree (layout->buffer), line, layout); line_data = _gtk_text_line_get_data (line, layout); delta_height += line_data->height - old_height; if (!first_line) { first_line = line; first_line_y = seen; } last_line = line; last_line_y = seen + line_data->height; } seen += line_data->height; line = _gtk_text_line_next (line); } /* If we found and validated any invalid lines, update size and * emit the changed signal */ if (first_line) { gint line_top; update_layout_size (layout); line_top = _gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer), first_line, layout); gtk_text_layout_changed (layout, line_top, last_line_y - first_line_y - delta_height, last_line_y - first_line_y); } } /** * gtk_text_layout_validate: * @tree: a #GtkTextLayout * @max_pixels: the maximum number of pixels to validate. (No more * than one paragraph beyond this limit will be validated) * * Validate regions of a #GtkTextLayout. The ::changed signal will * be emitted for each region validated. **/ void gtk_text_layout_validate (GtkTextLayout *layout, gint max_pixels) { gint y, old_height, new_height; g_return_if_fail (layout != NULL); g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout)); while (max_pixels > 0 && _gtk_text_btree_validate (_gtk_text_buffer_get_btree (layout->buffer), layout, max_pixels, &y, &old_height, &new_height)) { max_pixels -= new_height; update_layout_size (layout); gtk_text_layout_changed (layout, y, old_height, new_height); } } static GtkTextLineData* gtk_text_layout_real_wrap (GtkTextLayout *layout, GtkTextLine *line, /* may be NULL */ GtkTextLineData *line_data) { GtkTextLineDisplay *display; g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), NULL); if (line_data == NULL) { line_data = gtk_text_line_data_new (layout, line); _gtk_text_line_add_data (line, line_data); } display = gtk_text_layout_get_line_display (layout, line, TRUE); line_data->width = display->width; line_data->height = display->height; line_data->valid = TRUE; gtk_text_layout_free_line_display (layout, display); return line_data; } /* * Layout utility functions */ /* If you get the style with get_style () you need to call release_style () to free it. */ static GtkTextAttributes* get_style (GtkTextLayout *layout, const GtkTextIter *iter) { GtkTextTag** tags; gint tag_count = 0; GtkTextAttributes *style; /* If we have the one-style cache, then it means that we haven't seen a toggle since we filled in the one-style cache. */ if (layout->one_style_cache != NULL) { gtk_text_attributes_ref (layout->one_style_cache); return layout->one_style_cache; } g_assert (layout->one_style_cache == NULL); /* Get the tags at this spot */ tags = _gtk_text_btree_get_tags (iter, &tag_count); /* No tags, use default style */ if (tags == NULL || tag_count == 0) { /* One ref for the return value, one ref for the layout->one_style_cache reference */ gtk_text_attributes_ref (layout->default_style); gtk_text_attributes_ref (layout->default_style); layout->one_style_cache = layout->default_style; if (tags) g_free (tags); return layout->default_style; } /* Sort tags in ascending order of priority */ _gtk_text_tag_array_sort (tags, tag_count); style = gtk_text_attributes_new (); gtk_text_attributes_copy_values (layout->default_style, style); _gtk_text_attributes_fill_from_tags (style, tags, tag_count); g_free (tags); g_assert (style->refcount == 1); /* Leave this style as the last one seen */ g_assert (layout->one_style_cache == NULL); gtk_text_attributes_ref (style); /* ref held by layout->one_style_cache */ layout->one_style_cache = style; /* Returning yet another refcount */ return style; } static void release_style (GtkTextLayout *layout, GtkTextAttributes *style) { g_return_if_fail (style != NULL); g_return_if_fail (style->refcount > 0); gtk_text_attributes_unref (style); } /* * Lines */ /* This function tries to optimize the case where a line is completely invisible */ static gboolean totally_invisible_line (GtkTextLayout *layout, GtkTextLine *line, GtkTextIter *iter) { GtkTextLineSegment *seg; int bytes = 0; /* If we have a cached style, then we know it does actually apply * and we can just see if it is invisible. */ if (layout->one_style_cache && !layout->one_style_cache->invisible) return FALSE; /* Without the cache, we check if the first char is visible, if so * we are partially visible. Note that we have to check this since * we don't know the current invisible/noninvisible toggle state; this * function can use the whole btree to get it right. */ else { _gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer), iter, line, 0); if (!_gtk_text_btree_char_is_invisible (iter)) return FALSE; } bytes = 0; seg = line->segments; while (seg != NULL) { if (seg->byte_count > 0) bytes += seg->byte_count; /* Note that these two tests can cause us to bail out * when we shouldn't, because a higher-priority tag * may override these settings. However the important * thing is to only invisible really-invisible lines, rather * than to invisible all really-invisible lines. */ else if (seg->type == >k_text_toggle_on_type) { invalidate_cached_style (layout); /* Bail out if an elision-unsetting tag begins */ if (seg->body.toggle.info->tag->invisible_set && !seg->body.toggle.info->tag->values->invisible) break; } else if (seg->type == >k_text_toggle_off_type) { invalidate_cached_style (layout); /* Bail out if an elision-setting tag ends */ if (seg->body.toggle.info->tag->invisible_set && seg->body.toggle.info->tag->values->invisible) break; } seg = seg->next; } if (seg != NULL) /* didn't reach line end */ return FALSE; return TRUE; } static void set_para_values (GtkTextLayout *layout, GtkTextAttributes *style, GtkTextLineDisplay *display, gdouble *align) { PangoAlignment pango_align = PANGO_ALIGN_LEFT; int layout_width; display->direction = style->direction; if (display->direction == GTK_TEXT_DIR_LTR) display->layout = pango_layout_new (layout->ltr_context); else display->layout = pango_layout_new (layout->rtl_context); switch (style->justification) { case GTK_JUSTIFY_LEFT: pango_align = (style->direction == GTK_TEXT_DIR_LTR) ? PANGO_ALIGN_LEFT : PANGO_ALIGN_RIGHT; break; case GTK_JUSTIFY_RIGHT: pango_align = (style->direction == GTK_TEXT_DIR_LTR) ? PANGO_ALIGN_RIGHT : PANGO_ALIGN_LEFT; break; case GTK_JUSTIFY_CENTER: pango_align = PANGO_ALIGN_CENTER; break; case GTK_JUSTIFY_FILL: g_warning ("FIXME we don't support GTK_JUSTIFY_FILL yet"); break; default: g_assert_not_reached (); break; } switch (pango_align) { case PANGO_ALIGN_LEFT: *align = 0.0; break; case PANGO_ALIGN_RIGHT: *align = 1.0; break; case PANGO_ALIGN_CENTER: *align = 0.5; break; } pango_layout_set_alignment (display->layout, pango_align); pango_layout_set_spacing (display->layout, style->pixels_inside_wrap * PANGO_SCALE); if (style->tabs) pango_layout_set_tabs (display->layout, style->tabs); display->top_margin = style->pixels_above_lines; display->height = style->pixels_above_lines + style->pixels_below_lines; display->bottom_margin = style->pixels_below_lines; display->left_margin = style->left_margin; display->right_margin = style->right_margin; display->x_offset = display->left_margin; pango_layout_set_indent (display->layout, style->indent * PANGO_SCALE); switch (style->wrap_mode) { case GTK_WRAP_CHAR: layout_width = layout->screen_width - display->left_margin - display->right_margin; pango_layout_set_width (display->layout, layout_width * PANGO_SCALE); pango_layout_set_wrap (display->layout, PANGO_WRAP_CHAR); break; case GTK_WRAP_WORD: layout_width = layout->screen_width - display->left_margin - display->right_margin; pango_layout_set_width (display->layout, layout_width * PANGO_SCALE); pango_layout_set_wrap (display->layout, PANGO_WRAP_WORD); break; case GTK_WRAP_NONE: break; } display->total_width = MAX (layout->screen_width, layout->width) - display->left_margin - display->right_margin; } static PangoAttribute * gtk_text_attr_appearance_copy (const PangoAttribute *attr) { const GtkTextAttrAppearance *appearance_attr = (const GtkTextAttrAppearance *)attr; return gtk_text_attr_appearance_new (&appearance_attr->appearance); } static void gtk_text_attr_appearance_destroy (PangoAttribute *attr) { GtkTextAppearance *appearance = &((GtkTextAttrAppearance *)attr)->appearance; if (appearance->bg_stipple) gdk_drawable_unref (appearance->bg_stipple); if (appearance->fg_stipple) gdk_drawable_unref (appearance->fg_stipple); g_free (attr); } static gboolean gtk_text_attr_appearance_compare (const PangoAttribute *attr1, const PangoAttribute *attr2) { const GtkTextAppearance *appearance1 = &((const GtkTextAttrAppearance *)attr1)->appearance; const GtkTextAppearance *appearance2 = &((const GtkTextAttrAppearance *)attr2)->appearance; return (gdk_color_equal (&appearance1->fg_color, &appearance2->fg_color) && gdk_color_equal (&appearance1->bg_color, &appearance2->bg_color) && appearance1->fg_stipple == appearance2->fg_stipple && appearance1->bg_stipple == appearance2->bg_stipple && appearance1->underline == appearance2->underline && appearance1->strikethrough == appearance2->strikethrough && appearance1->draw_bg == appearance2->draw_bg); } /** * gtk_text_attr_appearance_new: * @desc: * * Create a new font description attribute. (This attribute * allows setting family, style, weight, variant, stretch, * and size simultaneously.) * * Return value: **/ static PangoAttribute * gtk_text_attr_appearance_new (const GtkTextAppearance *appearance) { static PangoAttrClass klass = { 0, gtk_text_attr_appearance_copy, gtk_text_attr_appearance_destroy, gtk_text_attr_appearance_compare }; GtkTextAttrAppearance *result; if (!klass.type) klass.type = gtk_text_attr_appearance_type = pango_attr_type_register ("GtkTextAttrAppearance"); result = g_new (GtkTextAttrAppearance, 1); result->attr.klass = &klass; result->appearance = *appearance; if (appearance->bg_stipple) gdk_drawable_ref (appearance->bg_stipple); if (appearance->fg_stipple) gdk_drawable_ref (appearance->fg_stipple); return (PangoAttribute *)result; } static void add_generic_attrs (GtkTextLayout *layout, GtkTextAppearance *appearance, gint byte_count, PangoAttrList *attrs, gint start, gboolean size_only, gboolean is_text) { PangoAttribute *attr; if (appearance->underline != PANGO_UNDERLINE_NONE) { attr = pango_attr_underline_new (appearance->underline); attr->start_index = start; attr->end_index = start + byte_count; pango_attr_list_insert (attrs, attr); } if (appearance->rise != 0) { attr = pango_attr_rise_new (appearance->rise); attr->start_index = start; attr->end_index = start + byte_count; pango_attr_list_insert (attrs, attr); } if (!size_only) { attr = gtk_text_attr_appearance_new (appearance); attr->start_index = start; attr->end_index = start + byte_count; ((GtkTextAttrAppearance *)attr)->appearance.is_text = is_text; pango_attr_list_insert (attrs, attr); } } static void add_text_attrs (GtkTextLayout *layout, GtkTextAttributes *style, gint byte_count, PangoAttrList *attrs, gint start, gboolean size_only) { PangoAttribute *attr; attr = pango_attr_font_desc_new (&style->font); attr->start_index = start; attr->end_index = start + byte_count; pango_attr_list_insert (attrs, attr); if (style->font_scale != 1.0) { attr = pango_attr_scale_new (style->font_scale); attr->start_index = start; attr->end_index = start + byte_count; pango_attr_list_insert (attrs, attr); } } static void add_pixbuf_attrs (GtkTextLayout *layout, GtkTextLineDisplay *display, GtkTextAttributes *style, GtkTextLineSegment *seg, PangoAttrList *attrs, gint start) { PangoAttribute *attr; PangoRectangle logical_rect; GtkTextPixbuf *pixbuf = &seg->body.pixbuf; gint width, height; width = gdk_pixbuf_get_width (pixbuf->pixbuf); height = gdk_pixbuf_get_height (pixbuf->pixbuf); logical_rect.x = 0; logical_rect.y = -height * PANGO_SCALE; logical_rect.width = width * PANGO_SCALE; logical_rect.height = height * PANGO_SCALE; attr = pango_attr_shape_new (&logical_rect, &logical_rect); attr->start_index = start; attr->end_index = start + seg->byte_count; pango_attr_list_insert (attrs, attr); display->shaped_objects = g_slist_append (display->shaped_objects, pixbuf->pixbuf); } static void add_child_attrs (GtkTextLayout *layout, GtkTextLineDisplay *display, GtkTextAttributes *style, GtkTextLineSegment *seg, PangoAttrList *attrs, gint start) { PangoAttribute *attr; PangoRectangle logical_rect; GtkTextChildAnchor *anchor; gint width, height; GSList *tmp_list; width = 1; height = 1; anchor = seg->body.child.obj; tmp_list = seg->body.child.widgets; while (tmp_list != NULL) { GtkWidget *child = tmp_list->data; if (_gtk_anchored_child_get_layout (child) == layout) { /* Found it */ GtkRequisition req; gtk_widget_get_child_requisition (child, &req); width = req.width; height = req.height; display->shaped_objects = g_slist_append (display->shaped_objects, child); break; } tmp_list = g_slist_next (tmp_list); } if (tmp_list == NULL) { /* No widget at this anchor in this display; * not an error. */ return; } if (layout->preedit_string) { g_free (layout->preedit_string); layout->preedit_string = NULL; } if (layout->preedit_attrs) { pango_attr_list_unref (layout->preedit_attrs); layout->preedit_attrs = NULL; } logical_rect.x = 0; logical_rect.y = -height * PANGO_SCALE; logical_rect.width = width * PANGO_SCALE; logical_rect.height = height * PANGO_SCALE; attr = pango_attr_shape_new (&logical_rect, &logical_rect); attr->start_index = start; attr->end_index = start + seg->byte_count; pango_attr_list_insert (attrs, attr); } static void add_cursor (GtkTextLayout *layout, GtkTextLineDisplay *display, GtkTextLineSegment *seg, gint start) { PangoRectangle strong_pos, weak_pos; GtkTextCursorDisplay *cursor = NULL; /* Quiet GCC */ gboolean add_weak = FALSE; gboolean add_strong = FALSE; /* Hide insertion cursor when we have a selection or the layout * user has hidden the cursor. */ if (_gtk_text_btree_mark_is_insert (_gtk_text_buffer_get_btree (layout->buffer), seg->body.mark.obj) && (!layout->cursor_visible || gtk_text_buffer_get_selection_bounds (layout->buffer, NULL, NULL))) return; pango_layout_get_cursor_pos (display->layout, start, &strong_pos, &weak_pos); if (layout->cursor_direction == GTK_TEXT_DIR_NONE) { add_strong = TRUE; add_weak = TRUE; } else if (display->direction == layout->cursor_direction) add_strong = TRUE; else add_weak = TRUE; if (add_strong) { cursor = g_new (GtkTextCursorDisplay, 1); cursor->x = PANGO_PIXELS (strong_pos.x); cursor->y = PANGO_PIXELS (strong_pos.y); cursor->height = PANGO_PIXELS (strong_pos.height); cursor->is_strong = TRUE; cursor->is_weak = FALSE; display->cursors = g_slist_prepend (display->cursors, cursor); } if (add_weak) { if (weak_pos.x == strong_pos.x && add_strong) cursor->is_weak = TRUE; else { cursor = g_new (GtkTextCursorDisplay, 1); cursor->x = PANGO_PIXELS (weak_pos.x); cursor->y = PANGO_PIXELS (weak_pos.y); cursor->height = PANGO_PIXELS (weak_pos.height); cursor->is_strong = FALSE; cursor->is_weak = TRUE; display->cursors = g_slist_prepend (display->cursors, cursor); } } } static gboolean is_shape (PangoLayoutRun *run) { GSList *tmp_list = run->item->extra_attrs; while (tmp_list) { PangoAttribute *attr = tmp_list->data; if (attr->klass->type == PANGO_ATTR_SHAPE) return TRUE; tmp_list = tmp_list->next; } return FALSE; } static void allocate_child_widgets (GtkTextLayout *text_layout, GtkTextLineDisplay *display) { GSList *shaped = display->shaped_objects; PangoLayout *layout = display->layout; PangoLayoutIter *iter; iter = pango_layout_get_iter (layout); do { PangoLayoutRun *run = pango_layout_iter_get_run (iter); if (run && is_shape (run)) { GObject *shaped_object = shaped->data; shaped = shaped->next; if (GTK_IS_WIDGET (shaped_object)) { PangoRectangle extents; /* We emit "allocate_child" with the x,y of * the widget with respect to the top of the line * and the left side of the buffer */ pango_layout_iter_get_run_extents (iter, NULL, &extents); g_signal_emit (G_OBJECT (text_layout), signals[ALLOCATE_CHILD], 0, shaped_object, PANGO_PIXELS (extents.x) + display->x_offset, PANGO_PIXELS (extents.y) + display->top_margin); } } } while (pango_layout_iter_next_run (iter)); pango_layout_iter_free (iter); } static void convert_color (GdkColor *result, PangoAttrColor *attr) { result->red = attr->color.red; result->blue = attr->color.blue; result->green = attr->color.green; } /* This function is used to convert the preedit string attributes, which are * standard PangoAttributes, into the custom attributes used by the text * widget and insert them into a attr list with a given offset. */ static void add_preedit_attrs (GtkTextLayout *layout, GtkTextAttributes *style, PangoAttrList *attrs, gint offset, gboolean size_only) { PangoAttrIterator *iter = pango_attr_list_get_iterator (layout->preedit_attrs); do { GtkTextAppearance appearance = style->appearance; PangoFontDescription font_desc; PangoAttribute *insert_attr; GSList *extra_attrs = NULL; GSList *tmp_list; gint start, end; pango_attr_iterator_range (iter, &start, &end); if (end == G_MAXINT) end = layout->preedit_len; pango_attr_iterator_get_font (iter, &style->font, &font_desc, &extra_attrs); tmp_list = extra_attrs; while (tmp_list) { PangoAttribute *attr = tmp_list->data; switch (attr->klass->type) { case PANGO_ATTR_FOREGROUND: convert_color (&appearance.fg_color, (PangoAttrColor *)attr); break; case PANGO_ATTR_BACKGROUND: convert_color (&appearance.bg_color, (PangoAttrColor *)attr); appearance.draw_bg = TRUE; break; case PANGO_ATTR_UNDERLINE: appearance.underline = ((PangoAttrInt *)attr)->value; break; case PANGO_ATTR_STRIKETHROUGH: appearance.strikethrough = ((PangoAttrInt *)attr)->value; break; case PANGO_ATTR_RISE: appearance.rise = ((PangoAttrInt *)attr)->value; break; default: break; } pango_attribute_destroy (attr); tmp_list = tmp_list->next; } g_slist_free (extra_attrs); insert_attr = pango_attr_font_desc_new (&font_desc); insert_attr->start_index = start + offset; insert_attr->end_index = end + offset; pango_attr_list_insert (attrs, insert_attr); add_generic_attrs (layout, &appearance, end - start, attrs, start + offset, size_only, TRUE); } while (pango_attr_iterator_next (iter)); pango_attr_iterator_destroy (iter); } GtkTextLineDisplay * gtk_text_layout_get_line_display (GtkTextLayout *layout, GtkTextLine *line, gboolean size_only) { GtkTextLineDisplay *display; GtkTextLineSegment *seg; GtkTextIter iter; GtkTextAttributes *style; gchar *text; PangoAttrList *attrs; gint text_allocated, layout_byte_offset, buffer_byte_offset; gdouble align; PangoRectangle extents; gboolean para_values_set = FALSE; GSList *cursor_byte_offsets = NULL; GSList *cursor_segs = NULL; GSList *tmp_list1, *tmp_list2; gboolean saw_widget = FALSE; g_return_val_if_fail (line != NULL, NULL); if (layout->one_display_cache) { if (line == layout->one_display_cache->line && (size_only || !layout->one_display_cache->size_only)) return layout->one_display_cache; else { GtkTextLineDisplay *tmp_display = layout->one_display_cache; layout->one_display_cache = NULL; gtk_text_layout_free_line_display (layout, tmp_display); } } display = g_new0 (GtkTextLineDisplay, 1); display->size_only = size_only; display->line = line; display->insert_index = -1; _gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer), &iter, line, 0); /* Special-case optimization for completely * invisible lines; makes it faster to deal * with sequences of invisible lines. */ if (totally_invisible_line (layout, line, &iter)) return display; /* Allocate space for flat text for buffer */ text_allocated = _gtk_text_line_byte_count (line); text = g_malloc (text_allocated); attrs = pango_attr_list_new (); /* Iterate over segments, creating display chunks for them. */ layout_byte_offset = 0; /* current length of layout text (includes preedit, does not include invisible text) */ buffer_byte_offset = 0; /* position in the buffer line */ seg = _gtk_text_iter_get_any_segment (&iter); while (seg != NULL) { /* Displayable segments */ if (seg->type == >k_text_char_type || seg->type == >k_text_pixbuf_type || seg->type == >k_text_child_type) { _gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer), &iter, line, buffer_byte_offset); style = get_style (layout, &iter); /* We have to delay setting the paragraph values until we * hit the first pixbuf or text segment because toggles at * the beginning of the paragraph should affect the * paragraph-global values */ if (!para_values_set) { set_para_values (layout, style, display, &align); para_values_set = TRUE; } /* First see if the chunk is invisible, and ignore it if so. Tk * looked at tabs, wrap mode, etc. before doing this, but * that made no sense to me, so I am just skipping the * invisible chunks */ if (!style->invisible) { if (seg->type == >k_text_char_type) { /* We don't want to split segments because of marks, * so we scan forward for more segments only * separated from us by marks. In theory, we should * also merge segments with identical styles, even * if there are toggles in-between */ gint bytes = 0; GtkTextLineSegment *prev_seg = NULL; while (seg) { if (seg->type == >k_text_char_type) { memcpy (text + layout_byte_offset, seg->body.chars, seg->byte_count); layout_byte_offset += seg->byte_count; buffer_byte_offset += seg->byte_count; bytes += seg->byte_count; } else if (seg->type == >k_text_right_mark_type || seg->type == >k_text_left_mark_type) { /* If we have preedit string, break out of this loop - we'll almost * certainly have different attributes on the preedit string */ if (layout->preedit_len > 0 && _gtk_text_btree_mark_is_insert (_gtk_text_buffer_get_btree (layout->buffer), seg->body.mark.obj)) break; if (seg->body.mark.visible) { cursor_byte_offsets = g_slist_prepend (cursor_byte_offsets, GINT_TO_POINTER (layout_byte_offset)); cursor_segs = g_slist_prepend (cursor_segs, seg); } } else break; prev_seg = seg; seg = seg->next; } seg = prev_seg; /* Back up one */ add_generic_attrs (layout, &style->appearance, bytes, attrs, layout_byte_offset - bytes, size_only, TRUE); add_text_attrs (layout, style, bytes, attrs, layout_byte_offset - bytes, size_only); } else if (seg->type == >k_text_pixbuf_type) { add_generic_attrs (layout, &style->appearance, seg->byte_count, attrs, layout_byte_offset, size_only, FALSE); add_pixbuf_attrs (layout, display, style, seg, attrs, layout_byte_offset); memcpy (text + layout_byte_offset, gtk_text_unknown_char_utf8, seg->byte_count); layout_byte_offset += seg->byte_count; buffer_byte_offset += seg->byte_count; } else if (seg->type == >k_text_child_type) { saw_widget = TRUE; add_generic_attrs (layout, &style->appearance, seg->byte_count, attrs, layout_byte_offset, size_only, FALSE); add_child_attrs (layout, display, style, seg, attrs, layout_byte_offset); memcpy (text + layout_byte_offset, gtk_text_unknown_char_utf8, seg->byte_count); layout_byte_offset += seg->byte_count; buffer_byte_offset += seg->byte_count; } else { /* We don't know this segment type */ g_assert_not_reached (); } } /* if (segment was visible) */ else { /* Invisible segment */ buffer_byte_offset += seg->byte_count; } release_style (layout, style); } /* Toggles */ else if (seg->type == >k_text_toggle_on_type || seg->type == >k_text_toggle_off_type) { /* Style may have changed, drop our current cached style */ invalidate_cached_style (layout); } /* Marks */ else if (seg->type == >k_text_right_mark_type || seg->type == >k_text_left_mark_type) { gint cursor_offset = 0; /* At the insertion point, add the preedit string, if any */ if (_gtk_text_btree_mark_is_insert (_gtk_text_buffer_get_btree (layout->buffer), seg->body.mark.obj)) { display->insert_index = layout_byte_offset; if (layout->preedit_len > 0) { text_allocated += layout->preedit_len; text = g_realloc (text, text_allocated); style = get_style (layout, &iter); add_preedit_attrs (layout, style, attrs, layout_byte_offset, size_only); release_style (layout, style); memcpy (text + layout_byte_offset, layout->preedit_string, layout->preedit_len); layout_byte_offset += layout->preedit_len; /* DO NOT increment the buffer byte offset for preedit */ cursor_offset = layout->preedit_cursor - layout->preedit_len; } } /* Display visible marks */ if (seg->body.mark.visible) { cursor_byte_offsets = g_slist_prepend (cursor_byte_offsets, GINT_TO_POINTER (layout_byte_offset + cursor_offset)); cursor_segs = g_slist_prepend (cursor_segs, seg); } } else g_error ("Unknown segment type: %s", seg->type->name); seg = seg->next; } if (!para_values_set) { style = get_style (layout, &iter); set_para_values (layout, style, display, &align); release_style (layout, style); } /* Pango doesn't want the trailing paragraph delimiters */ { /* Only one character has type G_UNICODE_PARAGRAPH_SEPARATOR in * Unicode 3.0; update this if that changes. */ #define PARAGRAPH_SEPARATOR 0x2029 gunichar ch = 0; if (layout_byte_offset > 0) { const char *prev = g_utf8_prev_char (text + layout_byte_offset); ch = g_utf8_get_char (prev); if (ch == PARAGRAPH_SEPARATOR || ch == '\r' || ch == '\n') layout_byte_offset = prev - text; /* chop off */ if (ch == '\n' && layout_byte_offset > 0) { /* Possibly chop a CR as well */ prev = g_utf8_prev_char (text + layout_byte_offset); if (*prev == '\r') --layout_byte_offset; } } } pango_layout_set_text (display->layout, text, layout_byte_offset); pango_layout_set_attributes (display->layout, attrs); tmp_list1 = cursor_byte_offsets; tmp_list2 = cursor_segs; while (tmp_list1) { add_cursor (layout, display, tmp_list2->data, GPOINTER_TO_INT (tmp_list1->data)); tmp_list1 = tmp_list1->next; tmp_list2 = tmp_list2->next; } g_slist_free (cursor_byte_offsets); g_slist_free (cursor_segs); pango_layout_get_extents (display->layout, NULL, &extents); display->x_offset += (display->total_width - PANGO_PIXELS (extents.x + extents.width)) * align; display->width = PANGO_PIXELS (extents.width) + display->left_margin + display->right_margin; display->height += PANGO_PIXELS (extents.height); /* Free this if we aren't in a loop */ if (layout->wrap_loop_count == 0) invalidate_cached_style (layout); g_free (text); pango_attr_list_unref (attrs); layout->one_display_cache = display; if (saw_widget) allocate_child_widgets (layout, display); return display; } void gtk_text_layout_free_line_display (GtkTextLayout *layout, GtkTextLineDisplay *display) { if (display != layout->one_display_cache) { if (display->layout) g_object_unref (G_OBJECT (display->layout)); if (display->cursors) { g_slist_foreach (display->cursors, (GFunc)g_free, NULL); g_slist_free (display->cursors); } g_slist_free (display->shaped_objects); g_free (display); } } /* Functions to convert iter <=> index for the line of a GtkTextLineDisplay * taking into account the preedit string and invisible text if necessary. */ static gint line_display_iter_to_index (GtkTextLayout *layout, GtkTextLineDisplay *display, const GtkTextIter *iter) { gint index; g_return_val_if_fail (_gtk_text_iter_get_text_line (iter) == display->line, 0); index = gtk_text_iter_get_visible_line_index (iter); if (index >= display->insert_index) index += layout->preedit_len; return index; } static void line_display_index_to_iter (GtkTextLayout *layout, GtkTextLineDisplay *display, GtkTextIter *iter, gint index, gint trailing) { if (index >= display->insert_index + layout->preedit_len) index -= layout->preedit_len; else if (index > display->insert_index) { index = display->insert_index; trailing = 0; } _gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer), iter, display->line, 0); gtk_text_iter_set_visible_line_index (iter, index); if (_gtk_text_iter_get_text_line (iter) != display->line) { /* Clamp to end of line - really this clamping should have been done * before here, maybe in Pango, this is a broken band-aid I think */ _gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer), iter, display->line, 0); if (!gtk_text_iter_ends_line (iter)) gtk_text_iter_forward_to_line_end (iter); } gtk_text_iter_forward_chars (iter, trailing); } /* FIXME: This really doesn't belong in this file ... */ static GtkTextLineData* gtk_text_line_data_new (GtkTextLayout *layout, GtkTextLine *line) { GtkTextLineData *line_data; line_data = g_new (GtkTextLineData, 1); line_data->view_id = layout; line_data->next = NULL; line_data->width = 0; line_data->height = 0; line_data->valid = FALSE; return line_data; } static void get_line_at_y (GtkTextLayout *layout, gint y, GtkTextLine **line, gint *line_top) { if (y < 0) y = 0; if (y > layout->height) y = layout->height; *line = _gtk_text_btree_find_line_by_y (_gtk_text_buffer_get_btree (layout->buffer), layout, y, line_top); if (*line == NULL) { *line = _gtk_text_btree_get_line (_gtk_text_buffer_get_btree (layout->buffer), _gtk_text_btree_line_count (_gtk_text_buffer_get_btree (layout->buffer)) - 1, NULL); if (line_top) *line_top = _gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer), *line, layout); } } /** * gtk_text_layout_get_line_at_y: * @layout: a #GtkLayout * @target_iter: the iterator in which the result is stored * @y: the y positition * @line_top: location to store the y coordinate of the * top of the line. (Can by %NULL.) * * Get the iter at the beginning of the line which is displayed * at the given y. **/ void gtk_text_layout_get_line_at_y (GtkTextLayout *layout, GtkTextIter *target_iter, gint y, gint *line_top) { GtkTextLine *line; g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout)); g_return_if_fail (target_iter != NULL); get_line_at_y (layout, y, &line, line_top); _gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer), target_iter, line, 0); } void gtk_text_layout_get_iter_at_pixel (GtkTextLayout *layout, GtkTextIter *target_iter, gint x, gint y) { GtkTextLine *line; gint byte_index, trailing; gint line_top; GtkTextLineDisplay *display; g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout)); g_return_if_fail (target_iter != NULL); /* Adjust pixels to be on-screen. This gives nice behavior if the user is dragging with a pointer grab. */ if (x < 0) x = 0; if (x > layout->width) x = layout->width; get_line_at_y (layout, y, &line, &line_top); display = gtk_text_layout_get_line_display (layout, line, FALSE); x -= display->x_offset; y -= line_top + display->top_margin; /* We clamp y to the area of the actual layout so that the layouts * hit testing works OK on the space above and below the layout */ y = CLAMP (y, 0, display->height - display->top_margin - display->bottom_margin - 1); if (!pango_layout_xy_to_index (display->layout, x * PANGO_SCALE, y * PANGO_SCALE, &byte_index, &trailing)) { byte_index = _gtk_text_line_byte_count (line); trailing = 0; } line_display_index_to_iter (layout, display, target_iter, byte_index, trailing); gtk_text_layout_free_line_display (layout, display); } /** * gtk_text_layout_get_cursor_locations * @layout: a #GtkTextLayout * @iter: a #GtkTextIter * @strong_pos: location to store the strong cursor position (may be %NULL) * @weak_pos: location to store the weak cursor position (may be %NULL) * * Given an iterator within a text laout, determine the positions that of the * strong and weak cursors if the insertion point is at that * iterator. The position of each cursor is stored as a zero-width * rectangle. The strong cursor location is the location where * characters of the directionality equal to the base direction of the * paragraph are inserted. The weak cursor location is the location * where characters of the directionality opposite to the base * direction of the paragraph are inserted. **/ void gtk_text_layout_get_cursor_locations (GtkTextLayout *layout, GtkTextIter *iter, GdkRectangle *strong_pos, GdkRectangle *weak_pos) { GtkTextLine *line; GtkTextLineDisplay *display; gint line_top; gint index; PangoRectangle pango_strong_pos; PangoRectangle pango_weak_pos; g_return_if_fail (layout != NULL); g_return_if_fail (iter != NULL); line = _gtk_text_iter_get_text_line (iter); display = gtk_text_layout_get_line_display (layout, line, FALSE); index = line_display_iter_to_index (layout, display, iter); line_top = _gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer), line, layout); pango_layout_get_cursor_pos (display->layout, index, strong_pos ? &pango_strong_pos : NULL, weak_pos ? &pango_weak_pos : NULL); if (strong_pos) { strong_pos->x = display->x_offset + pango_strong_pos.x / PANGO_SCALE; strong_pos->y = line_top + display->top_margin + pango_strong_pos.y / PANGO_SCALE; strong_pos->width = 0; strong_pos->height = pango_strong_pos.height / PANGO_SCALE; } if (weak_pos) { weak_pos->x = display->x_offset + pango_weak_pos.x / PANGO_SCALE; weak_pos->y = line_top + display->top_margin + pango_weak_pos.y / PANGO_SCALE; weak_pos->width = 0; weak_pos->height = pango_weak_pos.height / PANGO_SCALE; } gtk_text_layout_free_line_display (layout, display); } /** * gtk_text_layout_get_line_yrange: * @layout: a #GtkTextLayout * @iter: a #GtkTextIter * @y: location to store the top of the paragraph in pixels, * or %NULL. * @height location to store the height of the paragraph in pixels, * or %NULL. * * Find the range of y coordinates for the paragraph containing * the given iter. **/ void gtk_text_layout_get_line_yrange (GtkTextLayout *layout, const GtkTextIter *iter, gint *y, gint *height) { GtkTextLine *line; g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout)); g_return_if_fail (_gtk_text_iter_get_btree (iter) == _gtk_text_buffer_get_btree (layout->buffer)); line = _gtk_text_iter_get_text_line (iter); if (y) *y = _gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer), line, layout); if (height) { GtkTextLineData *line_data = _gtk_text_line_get_data (line, layout); if (line_data) *height = line_data->height; else *height = 0; } } void gtk_text_layout_get_iter_location (GtkTextLayout *layout, const GtkTextIter *iter, GdkRectangle *rect) { PangoRectangle pango_rect; GtkTextLine *line; GtkTextBTree *tree; GtkTextLineDisplay *display; gint byte_index; gint x_offset; g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout)); g_return_if_fail (_gtk_text_iter_get_btree (iter) == _gtk_text_buffer_get_btree (layout->buffer)); g_return_if_fail (rect != NULL); tree = _gtk_text_iter_get_btree (iter); line = _gtk_text_iter_get_text_line (iter); display = gtk_text_layout_get_line_display (layout, line, FALSE); rect->y = _gtk_text_btree_find_line_top (tree, line, layout); x_offset = display->x_offset * PANGO_SCALE; byte_index = gtk_text_iter_get_line_index (iter); pango_layout_index_to_pos (display->layout, byte_index, &pango_rect); rect->x = PANGO_PIXELS (x_offset + pango_rect.x); rect->y += PANGO_PIXELS (pango_rect.y) + display->top_margin; rect->width = PANGO_PIXELS (pango_rect.width); rect->height = PANGO_PIXELS (pango_rect.height); gtk_text_layout_free_line_display (layout, display); } /* FFIXX */ /* Find the iter for the logical beginning of the first display line whose * top y is >= y. If none exists, move the iter to the logical beginning * of the last line in the buffer. */ static void find_display_line_below (GtkTextLayout *layout, GtkTextIter *iter, gint y) { GtkTextLine *line, *next; GtkTextLine *found_line = NULL; gint line_top; gint found_byte = 0; line = _gtk_text_btree_find_line_by_y (_gtk_text_buffer_get_btree (layout->buffer), layout, y, &line_top); if (!line) { line = _gtk_text_btree_get_line (_gtk_text_buffer_get_btree (layout->buffer), _gtk_text_btree_line_count (_gtk_text_buffer_get_btree (layout->buffer)) - 1, NULL); line_top = _gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer), line, layout); } while (line && !found_line) { GtkTextLineDisplay *display = gtk_text_layout_get_line_display (layout, line, FALSE); PangoLayoutIter *layout_iter; layout_iter = pango_layout_get_iter (display->layout); line_top += display->top_margin; do { gint first_y, last_y; PangoLayoutLine *layout_line = pango_layout_iter_get_line (layout_iter); found_byte = layout_line->start_index; if (line_top >= y) { found_line = line; break; } pango_layout_iter_get_line_yrange (layout_iter, &first_y, &last_y); line_top += (last_y - first_y) / PANGO_SCALE; } while (pango_layout_iter_next_line (layout_iter)); pango_layout_iter_free (layout_iter); line_top += display->bottom_margin; gtk_text_layout_free_line_display (layout, display); next = _gtk_text_line_next (line); if (!next) found_line = line; line = next; } _gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer), iter, found_line, found_byte); } /* Find the iter for the logical beginning of the last display line whose * top y is >= y. If none exists, move the iter to the logical beginning * of the first line in the buffer. */ static void find_display_line_above (GtkTextLayout *layout, GtkTextIter *iter, gint y) { GtkTextLine *line; GtkTextLine *found_line = NULL; gint line_top; gint found_byte = 0; line = _gtk_text_btree_find_line_by_y (_gtk_text_buffer_get_btree (layout->buffer), layout, y, &line_top); if (!line) { line = _gtk_text_btree_get_line (_gtk_text_buffer_get_btree (layout->buffer), _gtk_text_btree_line_count (_gtk_text_buffer_get_btree (layout->buffer)) - 1, NULL); line_top = _gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer), line, layout); } while (line && !found_line) { GtkTextLineDisplay *display = gtk_text_layout_get_line_display (layout, line, FALSE); PangoRectangle logical_rect; PangoLayoutIter *layout_iter; gint tmp_top; layout_iter = pango_layout_get_iter (display->layout); line_top -= display->top_margin + display->bottom_margin; pango_layout_iter_get_layout_extents (layout_iter, NULL, &logical_rect); line_top -= logical_rect.height / PANGO_SCALE; tmp_top = line_top + display->top_margin; do { gint first_y, last_y; PangoLayoutLine *layout_line = pango_layout_iter_get_line (layout_iter); found_byte = layout_line->start_index; pango_layout_iter_get_line_yrange (layout_iter, &first_y, &last_y); tmp_top -= (last_y - first_y) / PANGO_SCALE; if (tmp_top < y) { found_line = line; goto done; } } while (pango_layout_iter_next_line (layout_iter)); pango_layout_iter_free (layout_iter); gtk_text_layout_free_line_display (layout, display); line = _gtk_text_line_previous (line); } done: if (found_line) _gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer), iter, found_line, found_byte); else gtk_text_buffer_get_iter_at_offset (layout->buffer, iter, 0); } /** * gtk_text_layout_clamp_iter_to_vrange: * @layout: a #GtkTextLayout * @iter: a #GtkTextIter * @top: the top of the range * @bottom: the bottom the range * * If the iterator is not fully in the range @top <= y < @bottom, * then, if possible, move it the minimum distance so that the * iterator in this range. * * Returns: %TRUE if the iterator was moved, otherwise %FALSE. **/ gboolean gtk_text_layout_clamp_iter_to_vrange (GtkTextLayout *layout, GtkTextIter *iter, gint top, gint bottom) { GdkRectangle iter_rect; gtk_text_layout_get_iter_location (layout, iter, &iter_rect); /* If the iter is at least partially above the range, put the iter * at the first fully visible line after the range. */ if (iter_rect.y < top) { find_display_line_below (layout, iter, top); return TRUE; } /* Otherwise, if the iter is at least partially below the screen, put the * iter on the last logical position of the last completely visible * line on screen */ else if (iter_rect.y + iter_rect.height > bottom) { find_display_line_above (layout, iter, bottom); return TRUE; } else return FALSE; } /** * gtk_text_layout_move_iter_to_previous_line: * @layout: a #GtkLayout * @iter: a #GtkTextIter * * Move the iterator to the beginning of the previous line. The lines * of a wrapped paragraph are treated as distinct for this operation. **/ gboolean gtk_text_layout_move_iter_to_previous_line (GtkTextLayout *layout, GtkTextIter *iter) { GtkTextLine *line; GtkTextLineDisplay *display; gint line_byte; GSList *tmp_list; PangoLayoutLine *layout_line; GtkTextIter orig; gboolean update_byte = FALSE; g_return_val_if_fail (layout != NULL, FALSE); g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), FALSE); g_return_val_if_fail (iter != NULL, FALSE); orig = *iter; line = _gtk_text_iter_get_text_line (iter); display = gtk_text_layout_get_line_display (layout, line, FALSE); line_byte = line_display_iter_to_index (layout, display, iter); /* If display->height == 0 then the line is invisible, so don't * move onto it. */ while (display->height == 0) { GtkTextLine *prev_line; prev_line = _gtk_text_line_previous (line); if (prev_line == NULL) { line_display_index_to_iter (layout, display, iter, 0, 0); goto out; } gtk_text_layout_free_line_display (layout, display); line = prev_line; display = gtk_text_layout_get_line_display (layout, prev_line, FALSE); update_byte = TRUE; } tmp_list = pango_layout_get_lines (display->layout); layout_line = tmp_list->data; if (update_byte) { line_byte = layout_line->start_index + layout_line->length; } if (line_byte < layout_line->length || !tmp_list->next) /* first line of paragraph */ { GtkTextLine *prev_line; prev_line = _gtk_text_line_previous (line); while (prev_line) { gtk_text_layout_free_line_display (layout, display); display = gtk_text_layout_get_line_display (layout, prev_line, FALSE); if (display->height > 0) { tmp_list = g_slist_last (pango_layout_get_lines (display->layout)); layout_line = tmp_list->data; line_display_index_to_iter (layout, display, iter, layout_line->start_index + layout_line->length, 0); break; } prev_line = _gtk_text_line_previous (prev_line); } if (prev_line == NULL) line_display_index_to_iter (layout, display, iter, 0, 0); } else { gint prev_offset = layout_line->start_index; tmp_list = tmp_list->next; while (tmp_list) { layout_line = tmp_list->data; if (line_byte < layout_line->start_index + layout_line->length || !tmp_list->next) { line_display_index_to_iter (layout, display, iter, prev_offset, 0); break; } prev_offset = layout_line->start_index; tmp_list = tmp_list->next; } } out: gtk_text_layout_free_line_display (layout, display); return !gtk_text_iter_equal (iter, &orig) && !gtk_text_iter_is_end (iter); } /** * gtk_text_layout_move_iter_to_next_line: * @layout: a #GtkLayout * @iter: a #GtkTextIter * * Move the iterator to the beginning of the next line. The * lines of a wrapped paragraph are treated as distinct for * this operation. **/ gboolean gtk_text_layout_move_iter_to_next_line (GtkTextLayout *layout, GtkTextIter *iter) { GtkTextLine *line; GtkTextLineDisplay *display; gint line_byte; GtkTextIter orig; gboolean found = FALSE; gboolean found_after = FALSE; gboolean first = TRUE; g_return_val_if_fail (layout != NULL, FALSE); g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), FALSE); g_return_val_if_fail (iter != NULL, FALSE); orig = *iter; line = _gtk_text_iter_get_text_line (iter); while (line && !found_after) { GSList *tmp_list; display = gtk_text_layout_get_line_display (layout, line, FALSE); if (display->height == 0) goto next; if (first) { line_byte = line_display_iter_to_index (layout, display, iter); first = FALSE; } else line_byte = 0; tmp_list = pango_layout_get_lines (display->layout); while (tmp_list && !found_after) { PangoLayoutLine *layout_line = tmp_list->data; if (found) { line_display_index_to_iter (layout, display, iter, layout_line->start_index, 0); found_after = TRUE; } else if (line_byte < layout_line->start_index + layout_line->length || !tmp_list->next) found = TRUE; tmp_list = tmp_list->next; } next: gtk_text_layout_free_line_display (layout, display); line = _gtk_text_line_next (line); } return !gtk_text_iter_equal (iter, &orig) && !gtk_text_iter_is_end (iter); } /** * gtk_text_layout_move_iter_to_line_end: * @layout: a #GtkTextLayout * @direction: if negative, move to beginning of line, otherwise move to end of line. * * Move to the beginning or end of a display line. **/ gboolean gtk_text_layout_move_iter_to_line_end (GtkTextLayout *layout, GtkTextIter *iter, gint direction) { GtkTextLine *line; GtkTextLineDisplay *display; gint line_byte; GSList *tmp_list; GtkTextIter orig; g_return_val_if_fail (layout != NULL, FALSE); g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), FALSE); g_return_val_if_fail (iter != NULL, FALSE); orig = *iter; line = _gtk_text_iter_get_text_line (iter); display = gtk_text_layout_get_line_display (layout, line, FALSE); line_byte = line_display_iter_to_index (layout, display, iter); tmp_list = pango_layout_get_lines (display->layout); while (tmp_list) { PangoLayoutLine *layout_line = tmp_list->data; if (line_byte < layout_line->start_index + layout_line->length || !tmp_list->next) { line_display_index_to_iter (layout, display, iter, direction < 0 ? layout_line->start_index : layout_line->start_index + layout_line->length, 0); /* FIXME: As a bad hack, we move back one position when we * are inside a paragraph to avoid going to next line on a * forced break not at whitespace. Real fix is to keep track * of whether marks are at leading or trailing edge? */ if (direction > 0 && layout_line->length > 0 && !gtk_text_iter_ends_line (iter)) gtk_text_iter_backward_char (iter); break; } tmp_list = tmp_list->next; } gtk_text_layout_free_line_display (layout, display); return !gtk_text_iter_equal (iter, &orig) && !gtk_text_iter_is_end (iter); } /** * gtk_text_layout_iter_starts_line: * @layout: a #GtkTextLayout * @iter: iterator to test * * Tests whether an iterator is at the start of a display line. **/ gboolean gtk_text_layout_iter_starts_line (GtkTextLayout *layout, const GtkTextIter *iter) { GtkTextLine *line; GtkTextLineDisplay *display; gint line_byte; GSList *tmp_list; g_return_val_if_fail (layout != NULL, FALSE); g_return_val_if_fail (GTK_IS_TEXT_LAYOUT (layout), FALSE); g_return_val_if_fail (iter != NULL, FALSE); line = _gtk_text_iter_get_text_line (iter); display = gtk_text_layout_get_line_display (layout, line, FALSE); line_byte = line_display_iter_to_index (layout, display, iter); tmp_list = pango_layout_get_lines (display->layout); while (tmp_list) { PangoLayoutLine *layout_line = tmp_list->data; if (line_byte < layout_line->start_index + layout_line->length || !tmp_list->next) { /* We're located on this line or the para delimiters before * it */ gtk_text_layout_free_line_display (layout, display); if (line_byte == layout_line->start_index) return TRUE; else return FALSE; } tmp_list = tmp_list->next; } g_assert_not_reached (); return FALSE; } void gtk_text_layout_get_iter_at_line (GtkTextLayout *layout, GtkTextIter *iter, GtkTextLine *line, gint byte_offset) { _gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer), iter, line, byte_offset); } /** * gtk_text_layout_move_iter_to_x: * @layout: a #GtkTextLayout * @iter: a #GtkTextIter * @x: X coordinate * * Keeping the iterator on the same line of the layout, move it to the * specified X coordinate. The lines of a wrapped paragraph are * treated as distinct for this operation. **/ void gtk_text_layout_move_iter_to_x (GtkTextLayout *layout, GtkTextIter *iter, gint x) { GtkTextLine *line; GtkTextLineDisplay *display; gint line_byte; PangoLayoutIter *layout_iter; g_return_if_fail (layout != NULL); g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout)); g_return_if_fail (iter != NULL); line = _gtk_text_iter_get_text_line (iter); display = gtk_text_layout_get_line_display (layout, line, FALSE); line_byte = line_display_iter_to_index (layout, display, iter); layout_iter = pango_layout_get_iter (display->layout); do { PangoLayoutLine *layout_line = pango_layout_iter_get_line (layout_iter); if (line_byte < layout_line->start_index + layout_line->length || pango_layout_iter_at_last_line (layout_iter)) { PangoRectangle logical_rect; gint byte_index, trailing; gint x_offset = display->x_offset * PANGO_SCALE; pango_layout_iter_get_line_extents (layout_iter, NULL, &logical_rect); pango_layout_line_x_to_index (layout_line, x * PANGO_SCALE - x_offset - logical_rect.x, &byte_index, &trailing); line_display_index_to_iter (layout, display, iter, byte_index, trailing); break; } } while (pango_layout_iter_next_line (layout_iter)); pango_layout_iter_free (layout_iter); gtk_text_layout_free_line_display (layout, display); } /** * gtk_text_layout_move_iter_visually: * @layout: a #GtkTextLayout * @iter: a #GtkTextIter * @count: number of characters to move (negative moves left, positive moves right) * * Move the iterator a given number of characters visually, treating * it as the strong cursor position. If @count is positive, then the * new strong cursor position will be @count positions to the right of * the old cursor position. If @count is negative then the new strong * cursor position will be @count positions to the left of the old * cursor position. * * In the presence of bidirection text, the correspondence * between logical and visual order will depend on the direction * of the current run, and there may be jumps when the cursor * is moved off of the end of a run. **/ gboolean gtk_text_layout_move_iter_visually (GtkTextLayout *layout, GtkTextIter *iter, gint count) { GtkTextLineDisplay *display = NULL; GtkTextIter orig; g_return_val_if_fail (layout != NULL, FALSE); g_return_val_if_fail (iter != NULL, FALSE); orig = *iter; while (count != 0) { GtkTextLine *line = _gtk_text_iter_get_text_line (iter); gint line_byte; gint extra_back = 0; gboolean strong; int byte_count = _gtk_text_line_byte_count (line); int new_index; int new_trailing; if (!display) display = gtk_text_layout_get_line_display (layout, line, FALSE); if (layout->cursor_direction == GTK_TEXT_DIR_NONE) strong = TRUE; else strong = display->direction == layout->cursor_direction; line_byte = line_display_iter_to_index (layout, display, iter); if (count > 0) { pango_layout_move_cursor_visually (display->layout, strong, line_byte, 0, 1, &new_index, &new_trailing); count--; } else { pango_layout_move_cursor_visually (display->layout, strong, line_byte, 0, -1, &new_index, &new_trailing); count++; } /* We need to handle the preedit string specially. Well, we don't really need to * handle it specially, since hopefully calling gtk_im_context_reset() will * remove the preedit string; but if we start off in front of the preedit * string (logically) and end up in or on the back edge of the preedit string, * we should move the iter one place farther. */ if (layout->preedit_len > 0 && display->insert_index >= 0) { if (line_byte == display->insert_index + layout->preedit_len && new_index < display->insert_index + layout->preedit_len) { line_byte = display->insert_index; extra_back = 1; } } if (new_index < 0 || (new_index == 0 && extra_back)) { line = _gtk_text_line_previous (line); if (!line) goto done; gtk_text_layout_free_line_display (layout, display); display = gtk_text_layout_get_line_display (layout, line, FALSE); new_index = _gtk_text_line_byte_count (line); } else if (new_index > byte_count) { line = _gtk_text_line_next (line); if (!line) goto done; gtk_text_layout_free_line_display (layout, display); display = gtk_text_layout_get_line_display (layout, line, FALSE); new_index = 0; } line_display_index_to_iter (layout, display, iter, new_index, new_trailing); if (extra_back) gtk_text_iter_backward_char (iter); } gtk_text_layout_free_line_display (layout, display); done: return !gtk_text_iter_equal (iter, &orig) && !gtk_text_iter_is_end (iter); } void gtk_text_layout_spew (GtkTextLayout *layout) { #if 0 GtkTextDisplayLine *iter; guint wrapped = 0; guint paragraphs = 0; GtkTextLine *last_line = NULL; iter = layout->line_list; while (iter != NULL) { if (iter->line != last_line) { printf ("%5u paragraph (%p)\n", paragraphs, iter->line); ++paragraphs; last_line = iter->line; } printf (" %5u y: %d len: %d start: %d bytes: %d\n", wrapped, iter->y, iter->length, iter->byte_offset, iter->byte_count); ++wrapped; iter = iter->next; } printf ("Layout %s recompute\n", layout->need_recompute ? "needs" : "doesn't need"); printf ("Layout pars: %u lines: %u size: %d x %d Screen width: %d\n", paragraphs, wrapped, layout->width, layout->height, layout->screen_width); #endif }