1 /* GTK - The GIMP Toolkit
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
21 * Modified by the GTK+ Team and others 1997-2001. See the AUTHORS
22 * file for a list of people on the GTK+ Team. See the ChangeLog
23 * files for a list of changes. These files are distributed with
24 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
28 #include "gtktextutil.h"
29 #include "gtktextview.h"
31 #define GTK_TEXT_USE_INTERNAL_UNSUPPORTED_API
33 #include "gtktextdisplay.h"
34 #include "gtktextbuffer.h"
35 #include "gtkmenuitem.h"
39 #define DRAG_ICON_MAX_WIDTH 250
40 #define DRAG_ICON_MAX_HEIGHT 250
41 #define DRAG_ICON_LAYOUT_BORDER 5
42 #define DRAG_ICON_MAX_LINES 7
43 #define ELLIPSIS_CHARACTER "\xe2\x80\xa6"
45 typedef struct _GtkUnicodeMenuEntry GtkUnicodeMenuEntry;
46 typedef struct _GtkTextUtilCallbackInfo GtkTextUtilCallbackInfo;
48 struct _GtkUnicodeMenuEntry {
53 struct _GtkTextUtilCallbackInfo
55 GtkTextUtilCharChosenFunc func;
59 static const GtkUnicodeMenuEntry bidi_menu_entries[] = {
60 { N_("LRM _Left-to-right mark"), 0x200E },
61 { N_("RLM _Right-to-left mark"), 0x200F },
62 { N_("LRE Left-to-right _embedding"), 0x202A },
63 { N_("RLE Right-to-left e_mbedding"), 0x202B },
64 { N_("LRO Left-to-right _override"), 0x202D },
65 { N_("RLO Right-to-left o_verride"), 0x202E },
66 { N_("PDF _Pop directional formatting"), 0x202C },
67 { N_("ZWS _Zero width space"), 0x200B },
68 { N_("ZWJ Zero width _joiner"), 0x200D },
69 { N_("ZWNJ Zero width _non-joiner"), 0x200C }
73 activate_cb (GtkWidget *menu_item,
76 GtkUnicodeMenuEntry *entry;
77 GtkTextUtilCallbackInfo *info = data;
80 entry = g_object_get_data (G_OBJECT (menu_item), "gtk-unicode-menu-entry");
82 buf[g_unichar_to_utf8 (entry->ch, buf)] = '\0';
84 (* info->func) (buf, info->data);
88 * _gtk_text_util_append_special_char_menuitems
89 * @menushell: a #GtkMenuShell
90 * @callback: call this when an item is chosen
91 * @data: data for callback
93 * Add menuitems for various bidi control characters to a menu;
94 * the menuitems, when selected, will call the given function
95 * with the chosen character.
97 * This function is private/internal in GTK 2.0, the functionality may
98 * become public sometime, but it probably needs more thought first.
99 * e.g. maybe there should be a way to just get the list of items,
100 * instead of requiring the menu items to be created.
103 _gtk_text_util_append_special_char_menuitems (GtkMenuShell *menushell,
104 GtkTextUtilCharChosenFunc func,
109 for (i = 0; i < G_N_ELEMENTS (bidi_menu_entries); i++)
112 GtkTextUtilCallbackInfo *info;
114 /* wasteful to have a bunch of copies, but simplifies mem management */
115 info = g_new (GtkTextUtilCallbackInfo, 1);
119 menuitem = gtk_menu_item_new_with_mnemonic (_(bidi_menu_entries[i].label));
120 g_object_set_data (G_OBJECT (menuitem), I_("gtk-unicode-menu-entry"),
121 (gpointer)&bidi_menu_entries[i]);
123 g_signal_connect_data (menuitem, "activate",
124 G_CALLBACK (activate_cb),
125 info, (GClosureNotify) g_free, 0);
127 gtk_widget_show (menuitem);
128 gtk_menu_shell_append (menushell, menuitem);
133 append_n_lines (GString *str, const gchar *text, GSList *lines, gint n_lines)
135 PangoLayoutLine *line;
138 for (i = 0; i < n_lines; i++)
141 g_string_append_len (str, &text[line->start_index], line->length);
147 limit_layout_lines (PangoLayout *layout)
151 GSList *lines, *elem;
154 n_lines = pango_layout_get_line_count (layout);
156 if (n_lines >= DRAG_ICON_MAX_LINES)
158 text = pango_layout_get_text (layout);
159 str = g_string_new (NULL);
160 lines = pango_layout_get_lines (layout);
162 /* get first lines */
164 append_n_lines (str, text, elem,
165 DRAG_ICON_MAX_LINES / 2);
167 g_string_append (str, "\n" ELLIPSIS_CHARACTER "\n");
170 elem = g_slist_nth (lines, n_lines - DRAG_ICON_MAX_LINES / 2);
171 append_n_lines (str, text, elem,
172 DRAG_ICON_MAX_LINES / 2);
174 pango_layout_set_text (layout, str->str, -1);
175 g_string_free (str, TRUE);
180 * _gtk_text_util_create_drag_icon
181 * @widget: #GtkWidget to extract the pango context
182 * @text: a #gchar to render the icon
183 * @len: length of @text, or -1 for NUL-terminated text
185 * Creates a drag and drop icon from @text.
188 _gtk_text_util_create_drag_icon (GtkWidget *widget,
192 GdkDrawable *drawable = NULL;
193 PangoContext *context;
195 gint pixmap_height, pixmap_width;
196 gint layout_width, layout_height;
198 g_return_val_if_fail (widget != NULL, NULL);
199 g_return_val_if_fail (text != NULL, NULL);
201 context = gtk_widget_get_pango_context (widget);
202 layout = pango_layout_new (context);
204 pango_layout_set_text (layout, text, len);
205 pango_layout_set_wrap (layout, PANGO_WRAP_WORD_CHAR);
206 pango_layout_get_size (layout, &layout_width, &layout_height);
208 layout_width = MIN (layout_width, DRAG_ICON_MAX_WIDTH * PANGO_SCALE);
209 pango_layout_set_width (layout, layout_width);
211 limit_layout_lines (layout);
213 /* get again layout extents, they may have changed */
214 pango_layout_get_size (layout, &layout_width, &layout_height);
216 pixmap_width = layout_width / PANGO_SCALE + DRAG_ICON_LAYOUT_BORDER * 2;
217 pixmap_height = layout_height / PANGO_SCALE + DRAG_ICON_LAYOUT_BORDER * 2;
219 drawable = gdk_pixmap_new (widget->window,
224 gdk_draw_rectangle (drawable,
225 widget->style->base_gc [GTK_WIDGET_STATE (widget)],
231 gdk_draw_layout (drawable,
232 widget->style->text_gc [GTK_WIDGET_STATE (widget)],
233 1 + DRAG_ICON_LAYOUT_BORDER,
234 1 + DRAG_ICON_LAYOUT_BORDER,
237 gdk_draw_rectangle (drawable,
238 widget->style->black_gc,
244 g_object_unref (layout);
250 gtk_text_view_set_attributes_from_style (GtkTextView *text_view,
251 GtkTextAttributes *values,
254 values->appearance.bg_color = style->base[GTK_STATE_NORMAL];
255 values->appearance.fg_color = style->text[GTK_STATE_NORMAL];
258 pango_font_description_free (values->font);
260 values->font = pango_font_description_copy (style->font_desc);
264 _gtk_text_util_create_rich_drag_icon (GtkWidget *widget,
265 GtkTextBuffer *buffer,
269 GdkDrawable *drawable = NULL;
270 gint pixmap_height, pixmap_width;
271 gint layout_width, layout_height;
272 GtkTextBuffer *new_buffer;
273 GtkTextLayout *layout;
274 GtkTextAttributes *style;
275 PangoContext *ltr_context, *rtl_context;
278 g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
279 g_return_val_if_fail (GTK_IS_TEXT_BUFFER (buffer), NULL);
280 g_return_val_if_fail (start != NULL, NULL);
281 g_return_val_if_fail (end != NULL, NULL);
283 new_buffer = gtk_text_buffer_new (gtk_text_buffer_get_tag_table (buffer));
284 gtk_text_buffer_get_start_iter (new_buffer, &iter);
286 gtk_text_buffer_insert_range (new_buffer, &iter, start, end);
288 gtk_text_buffer_get_start_iter (new_buffer, &iter);
290 layout = gtk_text_layout_new ();
292 ltr_context = gtk_widget_create_pango_context (widget);
293 pango_context_set_base_dir (ltr_context, PANGO_DIRECTION_LTR);
294 rtl_context = gtk_widget_create_pango_context (widget);
295 pango_context_set_base_dir (rtl_context, PANGO_DIRECTION_RTL);
297 gtk_text_layout_set_contexts (layout, ltr_context, rtl_context);
299 g_object_unref (ltr_context);
300 g_object_unref (rtl_context);
302 style = gtk_text_attributes_new ();
304 layout_width = widget->allocation.width;
306 if (GTK_IS_TEXT_VIEW (widget))
308 gtk_widget_ensure_style (widget);
309 gtk_text_view_set_attributes_from_style (GTK_TEXT_VIEW (widget),
310 style, widget->style);
312 layout_width = layout_width
313 - gtk_text_view_get_border_window_size (GTK_TEXT_VIEW (widget), GTK_TEXT_WINDOW_LEFT)
314 - gtk_text_view_get_border_window_size (GTK_TEXT_VIEW (widget), GTK_TEXT_WINDOW_RIGHT);
317 style->direction = gtk_widget_get_direction (widget);
318 style->wrap_mode = PANGO_WRAP_WORD_CHAR;
320 gtk_text_layout_set_default_style (layout, style);
321 gtk_text_attributes_unref (style);
323 gtk_text_layout_set_buffer (layout, new_buffer);
324 gtk_text_layout_set_cursor_visible (layout, FALSE);
325 gtk_text_layout_set_screen_width (layout, layout_width);
327 gtk_text_layout_validate (layout, DRAG_ICON_MAX_HEIGHT);
328 gtk_text_layout_get_size (layout, &layout_width, &layout_height);
330 g_print ("%s: layout size %d %d\n", G_STRFUNC, layout_width, layout_height);
332 layout_width = MIN (layout_width, DRAG_ICON_MAX_WIDTH);
333 layout_height = MIN (layout_height, DRAG_ICON_MAX_HEIGHT);
335 pixmap_width = layout_width + DRAG_ICON_LAYOUT_BORDER * 2;
336 pixmap_height = layout_height + DRAG_ICON_LAYOUT_BORDER * 2;
338 g_print ("%s: pixmap size %d %d\n", G_STRFUNC, pixmap_width, pixmap_height);
340 drawable = gdk_pixmap_new (widget->window,
341 pixmap_width + 2, pixmap_height + 2, -1);
343 gdk_draw_rectangle (drawable,
344 widget->style->base_gc [GTK_WIDGET_STATE (widget)],
350 gtk_text_layout_draw (layout, widget, drawable,
351 widget->style->text_gc [GTK_WIDGET_STATE (widget)],
352 - (1 + DRAG_ICON_LAYOUT_BORDER),
353 - (1 + DRAG_ICON_LAYOUT_BORDER),
355 pixmap_width, pixmap_height, NULL);
357 gdk_draw_rectangle (drawable,
358 widget->style->black_gc,
364 g_object_unref (layout);
365 g_object_unref (new_buffer);