/* GTK - The GIMP Toolkit * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald * * 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., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /* * Modified by the GTK+ Team and others 1997-2001. 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 #include "gtktextutil.h" #include "gtktextview.h" #define GTK_TEXT_USE_INTERNAL_UNSUPPORTED_API #include "gtktextdisplay.h" #include "gtktextbuffer.h" #include "gtkmenuitem.h" #include "gtkintl.h" #include "gtkalias.h" #define DRAG_ICON_MAX_WIDTH 250 #define DRAG_ICON_MAX_HEIGHT 250 #define DRAG_ICON_LAYOUT_BORDER 5 #define DRAG_ICON_MAX_LINES 7 #define ELLIPSIS_CHARACTER "\xe2\x80\xa6" typedef struct _GtkUnicodeMenuEntry GtkUnicodeMenuEntry; typedef struct _GtkTextUtilCallbackInfo GtkTextUtilCallbackInfo; struct _GtkUnicodeMenuEntry { const char *label; gunichar ch; }; struct _GtkTextUtilCallbackInfo { GtkTextUtilCharChosenFunc func; gpointer data; }; static const GtkUnicodeMenuEntry bidi_menu_entries[] = { { N_("LRM _Left-to-right mark"), 0x200E }, { N_("RLM _Right-to-left mark"), 0x200F }, { N_("LRE Left-to-right _embedding"), 0x202A }, { N_("RLE Right-to-left e_mbedding"), 0x202B }, { N_("LRO Left-to-right _override"), 0x202D }, { N_("RLO Right-to-left o_verride"), 0x202E }, { N_("PDF _Pop directional formatting"), 0x202C }, { N_("ZWS _Zero width space"), 0x200B }, { N_("ZWJ Zero width _joiner"), 0x200D }, { N_("ZWNJ Zero width _non-joiner"), 0x200C } }; static void activate_cb (GtkWidget *menu_item, gpointer data) { GtkUnicodeMenuEntry *entry; GtkTextUtilCallbackInfo *info = data; char buf[7]; entry = g_object_get_data (G_OBJECT (menu_item), "gtk-unicode-menu-entry"); buf[g_unichar_to_utf8 (entry->ch, buf)] = '\0'; (* info->func) (buf, info->data); } /** * _gtk_text_util_append_special_char_menuitems * @menushell: a #GtkMenuShell * @callback: call this when an item is chosen * @data: data for callback * * Add menuitems for various bidi control characters to a menu; * the menuitems, when selected, will call the given function * with the chosen character. * * This function is private/internal in GTK 2.0, the functionality may * become public sometime, but it probably needs more thought first. * e.g. maybe there should be a way to just get the list of items, * instead of requiring the menu items to be created. **/ void _gtk_text_util_append_special_char_menuitems (GtkMenuShell *menushell, GtkTextUtilCharChosenFunc func, gpointer data) { int i; for (i = 0; i < G_N_ELEMENTS (bidi_menu_entries); i++) { GtkWidget *menuitem; GtkTextUtilCallbackInfo *info; /* wasteful to have a bunch of copies, but simplifies mem management */ info = g_new (GtkTextUtilCallbackInfo, 1); info->func = func; info->data = data; menuitem = gtk_menu_item_new_with_mnemonic (_(bidi_menu_entries[i].label)); g_object_set_data (G_OBJECT (menuitem), I_("gtk-unicode-menu-entry"), (gpointer)&bidi_menu_entries[i]); g_signal_connect_data (menuitem, "activate", G_CALLBACK (activate_cb), info, (GClosureNotify) g_free, 0); gtk_widget_show (menuitem); gtk_menu_shell_append (menushell, menuitem); } } static void append_n_lines (GString *str, const gchar *text, GSList *lines, gint n_lines) { PangoLayoutLine *line; gint i; for (i = 0; i < n_lines; i++) { line = lines->data; g_string_append_len (str, &text[line->start_index], line->length); lines = lines->next; } } static void limit_layout_lines (PangoLayout *layout) { const gchar *text; GString *str; GSList *lines, *elem; gint n_lines; n_lines = pango_layout_get_line_count (layout); if (n_lines >= DRAG_ICON_MAX_LINES) { text = pango_layout_get_text (layout); str = g_string_new (NULL); lines = pango_layout_get_lines_readonly (layout); /* get first lines */ elem = lines; append_n_lines (str, text, elem, DRAG_ICON_MAX_LINES / 2); g_string_append (str, "\n" ELLIPSIS_CHARACTER "\n"); /* get last lines */ elem = g_slist_nth (lines, n_lines - DRAG_ICON_MAX_LINES / 2); append_n_lines (str, text, elem, DRAG_ICON_MAX_LINES / 2); pango_layout_set_text (layout, str->str, -1); g_string_free (str, TRUE); } } /** * _gtk_text_util_create_drag_icon * @widget: #GtkWidget to extract the pango context * @text: a #gchar to render the icon * @len: length of @text, or -1 for NUL-terminated text * * Creates a drag and drop icon from @text. **/ GdkPixmap * _gtk_text_util_create_drag_icon (GtkWidget *widget, gchar *text, gsize len) { GdkDrawable *drawable = NULL; PangoContext *context; PangoLayout *layout; gint pixmap_height, pixmap_width; gint layout_width, layout_height; g_return_val_if_fail (widget != NULL, NULL); g_return_val_if_fail (text != NULL, NULL); context = gtk_widget_get_pango_context (widget); layout = pango_layout_new (context); pango_layout_set_text (layout, text, len); pango_layout_set_wrap (layout, PANGO_WRAP_WORD_CHAR); pango_layout_get_size (layout, &layout_width, &layout_height); layout_width = MIN (layout_width, DRAG_ICON_MAX_WIDTH * PANGO_SCALE); pango_layout_set_width (layout, layout_width); limit_layout_lines (layout); /* get again layout extents, they may have changed */ pango_layout_get_size (layout, &layout_width, &layout_height); pixmap_width = layout_width / PANGO_SCALE + DRAG_ICON_LAYOUT_BORDER * 2; pixmap_height = layout_height / PANGO_SCALE + DRAG_ICON_LAYOUT_BORDER * 2; drawable = gdk_pixmap_new (widget->window, pixmap_width + 2, pixmap_height + 2, -1); gdk_draw_rectangle (drawable, widget->style->base_gc [GTK_WIDGET_STATE (widget)], TRUE, 0, 0, pixmap_width + 1, pixmap_height + 1); gdk_draw_layout (drawable, widget->style->text_gc [GTK_WIDGET_STATE (widget)], 1 + DRAG_ICON_LAYOUT_BORDER, 1 + DRAG_ICON_LAYOUT_BORDER, layout); gdk_draw_rectangle (drawable, widget->style->black_gc, FALSE, 0, 0, pixmap_width + 1, pixmap_height + 1); g_object_unref (layout); return drawable; } static void gtk_text_view_set_attributes_from_style (GtkTextView *text_view, GtkTextAttributes *values, GtkStyle *style) { values->appearance.bg_color = style->base[GTK_STATE_NORMAL]; values->appearance.fg_color = style->text[GTK_STATE_NORMAL]; if (values->font) pango_font_description_free (values->font); values->font = pango_font_description_copy (style->font_desc); } GdkPixmap * _gtk_text_util_create_rich_drag_icon (GtkWidget *widget, GtkTextBuffer *buffer, GtkTextIter *start, GtkTextIter *end) { GdkDrawable *drawable = NULL; gint pixmap_height, pixmap_width; gint layout_width, layout_height; GtkTextBuffer *new_buffer; GtkTextLayout *layout; GtkTextAttributes *style; PangoContext *ltr_context, *rtl_context; GtkTextIter iter; g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL); g_return_val_if_fail (GTK_IS_TEXT_BUFFER (buffer), NULL); g_return_val_if_fail (start != NULL, NULL); g_return_val_if_fail (end != NULL, NULL); new_buffer = gtk_text_buffer_new (gtk_text_buffer_get_tag_table (buffer)); gtk_text_buffer_get_start_iter (new_buffer, &iter); gtk_text_buffer_insert_range (new_buffer, &iter, start, end); gtk_text_buffer_get_start_iter (new_buffer, &iter); layout = gtk_text_layout_new (); ltr_context = gtk_widget_create_pango_context (widget); pango_context_set_base_dir (ltr_context, PANGO_DIRECTION_LTR); rtl_context = gtk_widget_create_pango_context (widget); pango_context_set_base_dir (rtl_context, PANGO_DIRECTION_RTL); gtk_text_layout_set_contexts (layout, ltr_context, rtl_context); g_object_unref (ltr_context); g_object_unref (rtl_context); style = gtk_text_attributes_new (); layout_width = widget->allocation.width; if (GTK_IS_TEXT_VIEW (widget)) { gtk_widget_ensure_style (widget); gtk_text_view_set_attributes_from_style (GTK_TEXT_VIEW (widget), style, widget->style); layout_width = layout_width - gtk_text_view_get_border_window_size (GTK_TEXT_VIEW (widget), GTK_TEXT_WINDOW_LEFT) - gtk_text_view_get_border_window_size (GTK_TEXT_VIEW (widget), GTK_TEXT_WINDOW_RIGHT); } style->direction = gtk_widget_get_direction (widget); style->wrap_mode = PANGO_WRAP_WORD_CHAR; gtk_text_layout_set_default_style (layout, style); gtk_text_attributes_unref (style); gtk_text_layout_set_buffer (layout, new_buffer); gtk_text_layout_set_cursor_visible (layout, FALSE); gtk_text_layout_set_screen_width (layout, layout_width); gtk_text_layout_validate (layout, DRAG_ICON_MAX_HEIGHT); gtk_text_layout_get_size (layout, &layout_width, &layout_height); layout_width = MIN (layout_width, DRAG_ICON_MAX_WIDTH); layout_height = MIN (layout_height, DRAG_ICON_MAX_HEIGHT); pixmap_width = layout_width + DRAG_ICON_LAYOUT_BORDER * 2; pixmap_height = layout_height + DRAG_ICON_LAYOUT_BORDER * 2; drawable = gdk_pixmap_new (widget->window, pixmap_width + 2, pixmap_height + 2, -1); gdk_draw_rectangle (drawable, widget->style->base_gc [GTK_WIDGET_STATE (widget)], TRUE, 0, 0, pixmap_width + 1, pixmap_height + 1); gtk_text_layout_draw (layout, widget, drawable, widget->style->text_gc [GTK_WIDGET_STATE (widget)], - (1 + DRAG_ICON_LAYOUT_BORDER), - (1 + DRAG_ICON_LAYOUT_BORDER), 0, 0, pixmap_width, pixmap_height, NULL); gdk_draw_rectangle (drawable, widget->style->black_gc, FALSE, 0, 0, pixmap_width + 1, pixmap_height + 1); g_object_unref (layout); g_object_unref (new_buffer); return drawable; } static gint layout_get_char_width (PangoLayout *layout) { gint width; PangoFontMetrics *metrics; const PangoFontDescription *font_desc; PangoContext *context = pango_layout_get_context (layout); font_desc = pango_layout_get_font_description (layout); if (!font_desc) font_desc = pango_context_get_font_description (context); metrics = pango_context_get_metrics (context, font_desc, NULL); width = pango_font_metrics_get_approximate_char_width (metrics); pango_font_metrics_unref (metrics); return width; } /** * _gtk_text_util_get_block_cursor_location * @layout: a #PangoLayout * @index: index at which cursor is located * @rect: cursor location * * Returns: whether cursor should actually be drawn as a rectangle. * It may not be the case if character at index is invisible. **/ gboolean _gtk_text_util_get_block_cursor_location (PangoLayout *layout, gint index, PangoRectangle *pos, gboolean *at_line_end) { PangoRectangle strong_pos, weak_pos; PangoLayoutLine *layout_line; gboolean rtl; gint line_no; g_return_val_if_fail (layout != NULL, FALSE); g_return_val_if_fail (index >= 0, FALSE); g_return_val_if_fail (pos != NULL, FALSE); pango_layout_index_to_pos (layout, index, pos); if (pos->width != 0) { /* cursor is at some visible character, good */ if (at_line_end) *at_line_end = FALSE; if (pos->width < 0) { pos->x += pos->width; pos->width = -pos->width; } return TRUE; } pango_layout_index_to_line_x (layout, index, FALSE, &line_no, NULL); g_return_val_if_fail (line_no >= 0, FALSE); layout_line = pango_layout_get_line_readonly (layout, line_no); /* end of layout, get last line */ if (!layout_line) { line_no -= 1; layout_line = pango_layout_get_line_readonly (layout, line_no); } g_return_val_if_fail (layout_line != NULL, FALSE); if (index < layout_line->start_index + layout_line->length) { /* cursor points to some zero-width character, do not * bother with block cursor */ return FALSE; } /* Cursor is at the line end. It may be an empty line, or it could * be on the left or on the right depending on text direction, or it * even could be in the middle of visual layout in bidi text. */ pango_layout_get_cursor_pos (layout, index, &strong_pos, &weak_pos); if (strong_pos.x != weak_pos.x) { /* do not show block cursor in this case, since the character typed * in may or may not appear at the cursor position */ return FALSE; } /* In case when index points to the end of line, pos->x is always most right * pixel of the layout line, so we need to correct it for RTL text. */ if (layout_line->length) { gint left, right; const gchar *text; const gchar *p; text = pango_layout_get_text (layout); p = g_utf8_prev_char (text + index); pango_layout_line_index_to_x (layout_line, p - text, FALSE, &left); pango_layout_line_index_to_x (layout_line, p - text, TRUE, &right); if (MIN (left, right) <= 0) { /* last character is on the left, RTL */ PangoLayoutIter *iter; PangoRectangle line_rect; gint i; iter = pango_layout_get_iter (layout); for (i = 0; i < line_no; i++) pango_layout_iter_next_line (iter); pango_layout_iter_get_line_extents (iter, NULL, &line_rect); pango_layout_iter_free (iter); rtl = TRUE; pos->x = MIN (left, right) + line_rect.x; } else rtl = FALSE; } else { PangoContext *context = pango_layout_get_context (layout); rtl = pango_context_get_base_dir (context) == PANGO_DIRECTION_RTL; } pos->width = layout_get_char_width (layout); if (rtl) pos->x -= pos->width - 1; if (at_line_end) *at_line_end = TRUE; return pos->width != 0; }