/* 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 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. * */ #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_real_get_log_attrs (GtkTextLayout *layout, GtkTextLine *line, PangoLogAttr **attrs, gint *n_attrs); 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_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, 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_destroy (GtkObject *object); 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; GtkType gtk_text_layout_get_type (void) { static GtkType our_type = 0; if (our_type == 0) { static const GtkTypeInfo our_info = { "GtkTextLayout", sizeof (GtkTextLayout), sizeof (GtkTextLayoutClass), (GtkClassInitFunc) gtk_text_layout_class_init, (GtkObjectInitFunc) gtk_text_layout_init, /* reserved_1 */ NULL, /* reserved_2 */ NULL, (GtkClassInitFunc) NULL }; our_type = gtk_type_unique (GTK_TYPE_OBJECT, &our_info); } return our_type; } static void gtk_text_layout_class_init (GtkTextLayoutClass *klass) { GObjectClass *gobject_class = G_OBJECT_CLASS (klass); GtkObjectClass *object_class = GTK_OBJECT_CLASS (klass); parent_class = gtk_type_class (GTK_TYPE_OBJECT); signals[INVALIDATED] = gtk_signal_new ("invalidated", GTK_RUN_LAST, GTK_CLASS_TYPE (object_class), GTK_SIGNAL_OFFSET (GtkTextLayoutClass, invalidated), gtk_marshal_VOID__VOID, GTK_TYPE_NONE, 0); signals[CHANGED] = gtk_signal_new ("changed", GTK_RUN_LAST, GTK_CLASS_TYPE (object_class), GTK_SIGNAL_OFFSET (GtkTextLayoutClass, changed), gtk_marshal_VOID__INT_INT_INT, GTK_TYPE_NONE, 3, GTK_TYPE_INT, GTK_TYPE_INT, GTK_TYPE_INT); gtk_object_class_add_signals (object_class, signals, LAST_SIGNAL); object_class->destroy = gtk_text_layout_destroy; gobject_class->finalize = gtk_text_layout_finalize; klass->wrap = gtk_text_layout_real_wrap; klass->get_log_attrs = gtk_text_layout_real_get_log_attrs; klass->invalidate = gtk_text_layout_real_invalidate; klass->free_line_data = gtk_text_layout_real_free_line_data; } void gtk_text_layout_init (GtkTextLayout *text_layout) { text_layout->cursor_visible = TRUE; } GtkTextLayout* gtk_text_layout_new (void) { return GTK_TEXT_LAYOUT (gtk_type_new (gtk_text_layout_get_type ())); } 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_destroy (GtkObject *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; } (* parent_class->destroy) (object); } static void gtk_text_layout_finalize (GObject *object) { GtkTextLayout *text_layout; text_layout = GTK_TEXT_LAYOUT (object); (* 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); gtk_object_unref (GTK_OBJECT (layout->buffer)); layout->buffer = NULL; } if (buffer) { layout->buffer = buffer; gtk_object_sink (GTK_OBJECT (buffer)); gtk_object_ref (GTK_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); } 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; } void gtk_text_layout_get_size (GtkTextLayout *layout, gint *width, gint *height) { gint w, h; g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout)); gtk_text_btree_get_view_size (_gtk_text_buffer_get_btree (layout->buffer), layout, &w, &h); layout->width = w; layout->height = h; if (width) *width = layout->width; if (height) *height = layout->height; } static void gtk_text_layout_invalidated (GtkTextLayout *layout) { gtk_signal_emit (GTK_OBJECT (layout), signals[INVALIDATED]); } void gtk_text_layout_changed (GtkTextLayout *layout, gint y, gint old_height, gint new_height) { gtk_signal_emit (GTK_OBJECT (layout), signals[CHANGED], 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); } void gtk_text_layout_get_log_attrs (GtkTextLayout *layout, GtkTextLine *line, PangoLogAttr **attrs, gint *n_attrs) { (* GTK_TEXT_LAYOUT_GET_CLASS (layout)->get_log_attrs) (layout, line, attrs, n_attrs); } 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) { g_assert (top_y > 0); /* 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); } } 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); } /** * 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, emit the changed singal */ if (first_line) { gint 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; 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; } static void gtk_text_layout_real_get_log_attrs (GtkTextLayout *layout, GtkTextLine *line, PangoLogAttr **attrs, gint *n_attrs) { GtkTextLineDisplay *display; g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout)); display = gtk_text_layout_get_line_display (layout, line, TRUE); pango_layout_get_log_attrs (display->layout, attrs, n_attrs); gtk_text_layout_free_line_display (layout, display); } /* * 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 (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->justify) { 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->x_offset = display->left_margin = MIN (style->left_margin, style->left_wrapped_line_margin); display->right_margin = style->right_margin; pango_layout_set_indent (display->layout, style->left_margin - style->left_wrapped_line_margin); switch (style->wrap_mode) { case GTK_WRAPMODE_CHAR: /* FIXME: Handle this; for now, fall-through */ case GTK_WRAPMODE_WORD: display->total_width = -1; layout_width = layout->screen_width - display->x_offset - style->right_margin; pango_layout_set_width (display->layout, layout_width * PANGO_SCALE); break; case GTK_WRAPMODE_NONE: display->total_width = MAX (layout->screen_width, layout->width) - display->x_offset - style->right_margin; break; } } 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_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_desc); 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 (&style->appearance); 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->pixbufs = g_slist_append (display->pixbufs, pixbuf); } static void add_cursor (GtkTextLayout *layout, GtkTextLineDisplay *display, GtkTextLineSegment *seg, gint start) { PangoRectangle strong_pos, weak_pos; GtkTextCursorDisplay *cursor; /* 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); cursor = g_new (GtkTextCursorDisplay, 1); cursor->x = strong_pos.x / PANGO_SCALE; cursor->y = strong_pos.y / PANGO_SCALE; cursor->height = strong_pos.height / PANGO_SCALE; cursor->is_strong = TRUE; display->cursors = g_slist_prepend (display->cursors, cursor); if (weak_pos.x == strong_pos.x) cursor->is_weak = TRUE; else { cursor->is_weak = FALSE; cursor = g_new (GtkTextCursorDisplay, 1); cursor->x = weak_pos.x / PANGO_SCALE; cursor->y = weak_pos.y / PANGO_SCALE; cursor->height = weak_pos.height / PANGO_SCALE; cursor->is_strong = FALSE; cursor->is_weak = TRUE; display->cursors = g_slist_prepend (display->cursors, cursor); } } 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 byte_count, 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; 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; 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 */ byte_count = gtk_text_line_byte_count (line); text = g_malloc (byte_count); attrs = pango_attr_list_new (); /* Iterate over segments, creating display chunks for them. */ byte_offset = 0; 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) { gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer), &iter, line, 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 byte_count = 0; while (TRUE) { if (seg->type == >k_text_char_type) { memcpy (text + byte_offset, seg->body.chars, seg->byte_count); byte_offset += seg->byte_count; byte_count += seg->byte_count; } else if (seg->body.mark.visible) { cursor_byte_offsets = g_slist_prepend (cursor_byte_offsets, GINT_TO_POINTER (byte_offset)); cursor_segs = g_slist_prepend (cursor_segs, seg); } if (!seg->next || (seg->next->type != >k_text_right_mark_type && seg->next->type != >k_text_left_mark_type && seg->next->type != >k_text_char_type)) break; seg = seg->next; } add_text_attrs (layout, style, byte_count, attrs, byte_offset - byte_count, size_only); } else { add_pixbuf_attrs (layout, display, style, seg, attrs, byte_offset); memcpy (text + byte_offset, gtk_text_unknown_char_utf8, seg->byte_count); 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) { /* Display visible marks */ if (seg->body.mark.visible) { cursor_byte_offsets = g_slist_prepend (cursor_byte_offsets, GINT_TO_POINTER (byte_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 new line */ if (byte_offset > 0 && text[byte_offset - 1] == '\n') byte_offset--; pango_layout_set_text (display->layout, text, 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); if (display->total_width >= 0) display->x_offset += (display->total_width - extents.width / PANGO_SCALE) * align; display->width = extents.width / PANGO_SCALE + display->left_margin + display->right_margin; display->height += extents.height / PANGO_SCALE; /* 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; return display; } void gtk_text_layout_free_line_display (GtkTextLayout *layout, GtkTextLineDisplay *display) { if (display != layout->one_display_cache) { 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->pixbufs); } g_free (display); } } /* 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, display->top_margin, 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; } gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer), target_iter, line, byte_index); while (trailing--) gtk_text_iter_next_char (target_iter); 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; 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); line_top = gtk_text_btree_find_line_top (_gtk_text_buffer_get_btree (layout->buffer), line, layout); display = gtk_text_layout_get_line_display (layout, line, FALSE); pango_layout_get_cursor_pos (display->layout, gtk_text_iter_get_line_index (iter), 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; 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); /* pango_layout_index_to_pos() expects the index of a character within the layout, * so we have to special case the last character. FIXME: This should be moved * to Pango. */ if (gtk_text_iter_ends_line (iter)) { PangoLayoutLine *last_line = g_slist_last (pango_layout_get_lines (display->layout))->data; pango_layout_line_get_extents (last_line, NULL, &pango_rect); rect->x = display->x_offset + (pango_rect.x + pango_rect.width) / PANGO_SCALE; rect->y += display->top_margin; rect->width = 0; rect->height = pango_rect.height / PANGO_SCALE; } else { byte_index = gtk_text_iter_get_line_index (iter); pango_layout_index_to_pos (display->layout, byte_index, &pango_rect); rect->x = display->x_offset + pango_rect.x / PANGO_SCALE; rect->y += display->top_margin; rect->width = pango_rect.width / PANGO_SCALE; rect->height = pango_rect.height / PANGO_SCALE; } gtk_text_layout_free_line_display (layout, display); } /* 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); gint byte_index = 0; GSList *tmp_list = pango_layout_get_lines (display->layout); line_top += display->top_margin; while (tmp_list) { PangoRectangle logical_rect; PangoLayoutLine *layout_line = tmp_list->data; found_byte = byte_index; if (line_top >= y) { found_line = line; break; } pango_layout_line_get_extents (layout_line, NULL, &logical_rect); line_top += logical_rect.height / PANGO_SCALE; tmp_list = tmp_list->next; } 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; gint byte_index = 0; GSList *tmp_list; gint tmp_top; line_top -= display->top_margin + display->bottom_margin; pango_layout_get_extents (display->layout, NULL, &logical_rect); line_top -= logical_rect.height / PANGO_SCALE; tmp_top = line_top + display->top_margin; tmp_list = pango_layout_get_lines (display->layout); while (tmp_list) { PangoLayoutLine *layout_line = tmp_list->data; found_byte = byte_index; tmp_top += logical_rect.height / PANGO_SCALE; if (tmp_top < y) { found_line = line; found_byte = byte_index; } pango_layout_line_get_extents (layout_line, NULL, &logical_rect); tmp_list = tmp_list->next; } gtk_text_layout_free_line_display (layout, display); line = gtk_text_line_previous (line); } 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_next_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. **/ void 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; 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); line_byte = gtk_text_iter_get_line_index (iter); display = gtk_text_layout_get_line_display (layout, line, FALSE); tmp_list = pango_layout_get_lines (display->layout); layout_line = tmp_list->data; if (line_byte < layout_line->length || !tmp_list->next) /* first line of paragraph */ { GtkTextLine *prev_line = gtk_text_line_previous (line); if (prev_line) { gint byte_offset = 0; gtk_text_layout_free_line_display (layout, display); display = gtk_text_layout_get_line_display (layout, prev_line, FALSE); tmp_list = pango_layout_get_lines (display->layout); while (tmp_list->next) { layout_line = tmp_list->data; tmp_list = tmp_list->next; byte_offset += layout_line->length; } gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer), iter, prev_line, byte_offset); } else gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer), iter, line, 0); } else { gint prev_offset = 0; gint byte_offset = layout_line->length; tmp_list = tmp_list->next; while (tmp_list) { layout_line = tmp_list->data; if (line_byte < byte_offset + layout_line->length || !tmp_list->next) { gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer), iter, line, prev_offset); break; } prev_offset = byte_offset; byte_offset += layout_line->length; tmp_list = tmp_list->next; } } gtk_text_layout_free_line_display (layout, display); } /** * 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. **/ void gtk_text_layout_move_iter_to_next_line (GtkTextLayout *layout, GtkTextIter *iter) { GtkTextLine *line; GtkTextLineDisplay *display; gint line_byte; gboolean found = FALSE; gboolean found_after = FALSE; 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); line_byte = gtk_text_iter_get_line_index (iter); while (line && !found_after) { gint byte_offset = 0; GSList *tmp_list; display = gtk_text_layout_get_line_display (layout, line, FALSE); tmp_list = pango_layout_get_lines (display->layout); while (tmp_list && !found_after) { PangoLayoutLine *layout_line = tmp_list->data; if (found) { gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer), iter, line, byte_offset); found_after = TRUE; } else if (line_byte < byte_offset + layout_line->length || !tmp_list->next) found = TRUE; byte_offset += layout_line->length; tmp_list = tmp_list->next; } gtk_text_layout_free_line_display (layout, display); line = gtk_text_line_next (line); } } /** * 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. **/ void gtk_text_layout_move_iter_to_line_end (GtkTextLayout *layout, GtkTextIter *iter, gint direction) { GtkTextLine *line; GtkTextLineDisplay *display; gint line_byte; gint byte_offset = 0; GSList *tmp_list; 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); line_byte = gtk_text_iter_get_line_index (iter); display = gtk_text_layout_get_line_display (layout, line, FALSE); tmp_list = pango_layout_get_lines (display->layout); while (tmp_list) { PangoLayoutLine *layout_line = tmp_list->data; if (line_byte < byte_offset + layout_line->length || !tmp_list->next) { gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer), iter, line, direction < 0 ? byte_offset : layout_line->length); /* FIXME: Move back one position to avoid going to next line */ if (direction < 0 && layout_line->length > 0) gtk_text_iter_prev_char (iter); break; } byte_offset += layout_line->length; tmp_list = tmp_list->next; } gtk_text_layout_free_line_display (layout, display); } /** * 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; gint byte_offset = 0; GSList *tmp_list; 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); line_byte = gtk_text_iter_get_line_index (iter); display = gtk_text_layout_get_line_display (layout, line, FALSE); tmp_list = pango_layout_get_lines (display->layout); while (tmp_list) { PangoLayoutLine *layout_line = tmp_list->data; if (line_byte < byte_offset + layout_line->length || !tmp_list->next) { PangoRectangle logical_rect; gint byte_index, trailing; gint align = pango_layout_get_alignment (display->layout); gint x_offset = display->left_margin * PANGO_SCALE; gint width = pango_layout_get_width (display->layout); if (width < 0) width = display->total_width * PANGO_SCALE; pango_layout_line_get_extents (layout_line, NULL, &logical_rect); switch (align) { case PANGO_ALIGN_RIGHT: x_offset += width - logical_rect.width; break; case PANGO_ALIGN_CENTER: x_offset += (width - logical_rect.width) / 2; break; default: break; } pango_layout_line_x_to_index (layout_line, x * PANGO_SCALE - x_offset, &byte_index, &trailing); gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer), iter, line, byte_index); while (trailing--) gtk_text_iter_next_char (iter); break; } byte_offset += layout_line->length; tmp_list = tmp_list->next; } 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. **/ void gtk_text_layout_move_iter_visually (GtkTextLayout *layout, GtkTextIter *iter, gint count) { g_return_if_fail (layout != NULL); g_return_if_fail (iter != NULL); while (count != 0) { GtkTextLine *line = gtk_text_iter_get_text_line (iter); gint line_byte = gtk_text_iter_get_line_index (iter); GtkTextLineDisplay *display = gtk_text_layout_get_line_display (layout, line, FALSE); int byte_count = gtk_text_line_byte_count (line); int new_index; int new_trailing; if (count > 0) { pango_layout_move_cursor_visually (display->layout, line_byte, 0, 1, &new_index, &new_trailing); count--; } else { pango_layout_move_cursor_visually (display->layout, line_byte, 0, -1, &new_index, &new_trailing); count++; } gtk_text_layout_free_line_display (layout, display); if (new_index < 0) { line = gtk_text_line_previous (line); if (!line) return; new_index = gtk_text_line_byte_count (line); } else if (new_index > byte_count) { line = gtk_text_line_next (line); if (!line) return; new_index = 0; } gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer), iter, line, new_index); while (new_trailing--) gtk_text_iter_next_char (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 }