1 /* gtktextdisplay.c - display layed-out text
3 * Copyright (c) 1992-1994 The Regents of the University of California.
4 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
5 * Copyright (c) 2000 Red Hat, Inc.
6 * Tk->Gtk port by Havoc Pennington
8 * This file can be used under your choice of two licenses, the LGPL
9 * and the original Tk license.
13 * This library is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU Lesser General Public
15 * License as published by the Free Software Foundation; either
16 * version 2 of the License, or (at your option) any later version.
18 * This library is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * Lesser General Public License for more details.
23 * You should have received a copy of the GNU Lesser General Public
24 * License along with this library; if not, write to the Free
25 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 * Original Tk license:
29 * This software is copyrighted by the Regents of the University of
30 * California, Sun Microsystems, Inc., and other parties. The
31 * following terms apply to all files associated with the software
32 * unless explicitly disclaimed in individual files.
34 * The authors hereby grant permission to use, copy, modify,
35 * distribute, and license this software and its documentation for any
36 * purpose, provided that existing copyright notices are retained in
37 * all copies and that this notice is included verbatim in any
38 * distributions. No written agreement, license, or royalty fee is
39 * required for any of the authorized uses. Modifications to this
40 * software may be copyrighted by their authors and need not follow
41 * the licensing terms described here, provided that the new terms are
42 * clearly indicated on the first page of each file where they apply.
44 * IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY
45 * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
46 * DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION,
47 * OR ANY DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED
48 * OF THE POSSIBILITY OF SUCH DAMAGE.
50 * THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
51 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
52 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
53 * NON-INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS,
54 * AND THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE
55 * MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
57 * GOVERNMENT USE: If you are acquiring this software on behalf of the
58 * U.S. government, the Government shall have only "Restricted Rights"
59 * in the software and related documentation as defined in the Federal
60 * Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2). If you
61 * are acquiring the software on behalf of the Department of Defense,
62 * the software shall be classified as "Commercial Computer Software"
63 * and the Government shall have only "Restricted Rights" as defined
64 * in Clause 252.227-7013 (c) (1) of DFARs. Notwithstanding the
65 * foregoing, the authors grant the U.S. Government and others acting
66 * in its behalf permission to use and distribute the software in
67 * accordance with the terms specified in this license.
71 * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
72 * file for a list of people on the GTK+ Team. See the ChangeLog
73 * files for a list of changes. These files are distributed with
74 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
77 #define GTK_TEXT_USE_INTERNAL_UNSUPPORTED_API
79 #include "gtktextdisplay.h"
80 #include "gtkwidgetprivate.h"
81 #include "gtkstylecontextprivate.h"
84 /* DO NOT go putting private headers in here. This file should only
85 * use the semi-public headers, as with gtktextview.c.
88 #define GTK_TYPE_TEXT_RENDERER (_gtk_text_renderer_get_type())
89 #define GTK_TEXT_RENDERER(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), GTK_TYPE_TEXT_RENDERER, GtkTextRenderer))
90 #define GTK_IS_TEXT_RENDERER(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), GTK_TYPE_TEXT_RENDERER))
91 #define GTK_TEXT_RENDERER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_TEXT_RENDERER, GtkTextRendererClass))
92 #define GTK_IS_TEXT_RENDERER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_TEXT_RENDERER))
93 #define GTK_TEXT_RENDERER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_TEXT_RENDERER, GtkTextRendererClass))
95 typedef struct _GtkTextRenderer GtkTextRenderer;
96 typedef struct _GtkTextRendererClass GtkTextRendererClass;
104 struct _GtkTextRenderer
106 PangoRenderer parent_instance;
111 GdkColor *error_color; /* Error underline color for this widget */
112 GList *widgets; /* widgets encountered when drawing */
117 struct _GtkTextRendererClass
119 PangoRendererClass parent_class;
122 G_DEFINE_TYPE (GtkTextRenderer, _gtk_text_renderer, PANGO_TYPE_RENDERER)
125 text_renderer_set_gdk_color (GtkTextRenderer *text_renderer,
126 PangoRenderPart part,
129 PangoRenderer *renderer = PANGO_RENDERER (text_renderer);
135 color.red = gdk_color->red;
136 color.green = gdk_color->green;
137 color.blue = gdk_color->blue;
139 pango_renderer_set_color (renderer, part, &color);
142 pango_renderer_set_color (renderer, part, NULL);
146 text_renderer_set_rgba (GtkTextRenderer *text_renderer,
147 PangoRenderPart part,
150 PangoRenderer *renderer = PANGO_RENDERER (text_renderer);
156 color.red = CLAMP (rgba->red * 65535. + 0.5, 0, 65535);
157 color.green = CLAMP (rgba->green * 65535. + 0.5, 0, 65535);
158 color.blue = CLAMP (rgba->blue * 65535. + 0.5, 0, 65535);
160 pango_renderer_set_color (renderer, part, &color);
163 pango_renderer_set_color (renderer, part, NULL);
166 static GtkTextAppearance *
167 get_item_appearance (PangoItem *item)
169 GSList *tmp_list = item->analysis.extra_attrs;
173 PangoAttribute *attr = tmp_list->data;
175 if (attr->klass->type == gtk_text_attr_appearance_type)
176 return &((GtkTextAttrAppearance *)attr)->appearance;
178 tmp_list = tmp_list->next;
185 gtk_text_renderer_prepare_run (PangoRenderer *renderer,
188 GtkStyleContext *context;
190 GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
191 GdkColor *bg_color = NULL;
192 GdkRGBA *fg_rgba = NULL;
193 GdkColor *fg_color = NULL;
194 GtkTextAppearance *appearance;
196 PANGO_RENDERER_CLASS (_gtk_text_renderer_parent_class)->prepare_run (renderer, run);
198 appearance = get_item_appearance (run->item);
199 g_assert (appearance != NULL);
201 context = gtk_widget_get_style_context (text_renderer->widget);
203 state = gtk_widget_get_state_flags (text_renderer->widget);
205 if (appearance->draw_bg && text_renderer->state == NORMAL)
206 bg_color = &appearance->bg_color;
210 text_renderer_set_gdk_color (text_renderer, PANGO_RENDER_PART_BACKGROUND, bg_color);
212 if (text_renderer->state == SELECTED)
214 state |= GTK_STATE_FLAG_SELECTED;
216 gtk_style_context_get (context, state,
220 else if (text_renderer->state == CURSOR && gtk_widget_has_focus (text_renderer->widget))
222 gtk_style_context_get (context, state,
223 "background-color", &fg_rgba,
227 fg_color = &appearance->fg_color;
231 text_renderer_set_rgba (text_renderer, PANGO_RENDER_PART_FOREGROUND, fg_rgba);
232 text_renderer_set_rgba (text_renderer, PANGO_RENDER_PART_STRIKETHROUGH,fg_rgba);
236 text_renderer_set_gdk_color (text_renderer, PANGO_RENDER_PART_FOREGROUND, fg_color);
237 text_renderer_set_gdk_color (text_renderer, PANGO_RENDER_PART_STRIKETHROUGH, fg_color);
240 if (appearance->underline == PANGO_UNDERLINE_ERROR)
242 if (!text_renderer->error_color)
244 gtk_style_context_get_style (context,
245 "error-underline-color", &text_renderer->error_color,
248 if (!text_renderer->error_color)
250 static const GdkColor red = { 0, 0xffff, 0, 0 };
251 text_renderer->error_color = gdk_color_copy (&red);
255 text_renderer_set_gdk_color (text_renderer, PANGO_RENDER_PART_UNDERLINE, text_renderer->error_color);
258 text_renderer_set_rgba (text_renderer, PANGO_RENDER_PART_UNDERLINE, fg_rgba);
260 text_renderer_set_gdk_color (text_renderer, PANGO_RENDER_PART_UNDERLINE, fg_color);
264 set_color (GtkTextRenderer *text_renderer,
265 PangoRenderPart part)
269 cairo_save (text_renderer->cr);
271 color = pango_renderer_get_color (PANGO_RENDERER (text_renderer), part);
273 cairo_set_source_rgb (text_renderer->cr,
275 color->green / 65535.,
276 color->blue / 65535.);
280 unset_color (GtkTextRenderer *text_renderer)
282 cairo_restore (text_renderer->cr);
286 gtk_text_renderer_draw_glyphs (PangoRenderer *renderer,
288 PangoGlyphString *glyphs,
292 GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
294 set_color (text_renderer, PANGO_RENDER_PART_FOREGROUND);
296 cairo_move_to (text_renderer->cr, (double)x / PANGO_SCALE, (double)y / PANGO_SCALE);
297 pango_cairo_show_glyph_string (text_renderer->cr, font, glyphs);
299 unset_color (text_renderer);
303 gtk_text_renderer_draw_glyph_item (PangoRenderer *renderer,
305 PangoGlyphItem *glyph_item,
309 GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
311 set_color (text_renderer, PANGO_RENDER_PART_FOREGROUND);
313 cairo_move_to (text_renderer->cr, (double)x / PANGO_SCALE, (double)y / PANGO_SCALE);
314 pango_cairo_show_glyph_item (text_renderer->cr, text, glyph_item);
316 unset_color (text_renderer);
320 gtk_text_renderer_draw_rectangle (PangoRenderer *renderer,
321 PangoRenderPart part,
327 GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
329 set_color (text_renderer, part);
331 cairo_rectangle (text_renderer->cr,
332 (double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
333 (double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
334 cairo_fill (text_renderer->cr);
336 unset_color (text_renderer);
340 gtk_text_renderer_draw_trapezoid (PangoRenderer *renderer,
341 PangoRenderPart part,
349 GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
351 cairo_matrix_t matrix;
353 set_color (text_renderer, part);
355 cr = text_renderer->cr;
357 cairo_get_matrix (cr, &matrix);
358 matrix.xx = matrix.yy = 1.0;
359 matrix.xy = matrix.yx = 0.0;
360 cairo_set_matrix (cr, &matrix);
362 cairo_move_to (cr, x11, y1_);
363 cairo_line_to (cr, x21, y1_);
364 cairo_line_to (cr, x22, y2);
365 cairo_line_to (cr, x12, y2);
366 cairo_close_path (cr);
370 unset_color (text_renderer);
374 gtk_text_renderer_draw_error_underline (PangoRenderer *renderer,
380 GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
382 set_color (text_renderer, PANGO_RENDER_PART_UNDERLINE);
384 pango_cairo_show_error_underline (text_renderer->cr,
385 (double)x / PANGO_SCALE, (double)y / PANGO_SCALE,
386 (double)width / PANGO_SCALE, (double)height / PANGO_SCALE);
388 unset_color (text_renderer);
392 gtk_text_renderer_draw_shape (PangoRenderer *renderer,
393 PangoAttrShape *attr,
397 GtkTextRenderer *text_renderer = GTK_TEXT_RENDERER (renderer);
399 if (attr->data == NULL)
401 /* This happens if we have an empty widget anchor. Draw
402 * something empty-looking.
404 GdkRectangle shape_rect;
407 shape_rect.x = PANGO_PIXELS (x);
408 shape_rect.y = PANGO_PIXELS (y + attr->logical_rect.y);
409 shape_rect.width = PANGO_PIXELS (x + attr->logical_rect.width) - shape_rect.x;
410 shape_rect.height = PANGO_PIXELS (y + attr->logical_rect.y + attr->logical_rect.height) - shape_rect.y;
412 set_color (text_renderer, PANGO_RENDER_PART_FOREGROUND);
414 cr = text_renderer->cr;
416 cairo_set_line_width (cr, 1.0);
419 shape_rect.x + 0.5, shape_rect.y + 0.5,
420 shape_rect.width - 1, shape_rect.height - 1);
421 cairo_move_to (cr, shape_rect.x + 0.5, shape_rect.y + 0.5);
423 shape_rect.x + shape_rect.width - 0.5,
424 shape_rect.y + shape_rect.height - 0.5);
425 cairo_move_to (cr, shape_rect.x + 0.5,
426 shape_rect.y + shape_rect.height - 0.5);
427 cairo_line_to (cr, shape_rect.x + shape_rect.width - 0.5,
432 unset_color (text_renderer);
434 else if (GDK_IS_PIXBUF (attr->data))
436 cairo_t *cr = text_renderer->cr;
437 GdkPixbuf *pixbuf = GDK_PIXBUF (attr->data);
441 gdk_cairo_set_source_pixbuf (cr, pixbuf,
443 PANGO_PIXELS (y) - gdk_pixbuf_get_height (pixbuf));
448 else if (GTK_IS_WIDGET (attr->data))
452 widget = GTK_WIDGET (attr->data);
454 text_renderer->widgets = g_list_prepend (text_renderer->widgets,
455 g_object_ref (widget));
458 g_assert_not_reached (); /* not a pixbuf or widget */
462 gtk_text_renderer_finalize (GObject *object)
464 G_OBJECT_CLASS (_gtk_text_renderer_parent_class)->finalize (object);
468 _gtk_text_renderer_init (GtkTextRenderer *renderer)
473 _gtk_text_renderer_class_init (GtkTextRendererClass *klass)
475 GObjectClass *object_class = G_OBJECT_CLASS (klass);
477 PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);
479 renderer_class->prepare_run = gtk_text_renderer_prepare_run;
480 renderer_class->draw_glyphs = gtk_text_renderer_draw_glyphs;
481 renderer_class->draw_glyph_item = gtk_text_renderer_draw_glyph_item;
482 renderer_class->draw_rectangle = gtk_text_renderer_draw_rectangle;
483 renderer_class->draw_trapezoid = gtk_text_renderer_draw_trapezoid;
484 renderer_class->draw_error_underline = gtk_text_renderer_draw_error_underline;
485 renderer_class->draw_shape = gtk_text_renderer_draw_shape;
487 object_class->finalize = gtk_text_renderer_finalize;
491 text_renderer_set_state (GtkTextRenderer *text_renderer,
494 text_renderer->state = state;
498 text_renderer_begin (GtkTextRenderer *text_renderer,
502 GtkStyleContext *context;
506 text_renderer->widget = widget;
507 text_renderer->cr = cr;
509 context = gtk_widget_get_style_context (widget);
511 gtk_style_context_save (context);
512 gtk_style_context_add_class (context, GTK_STYLE_CLASS_VIEW);
514 state = gtk_widget_get_state_flags (widget);
515 gtk_style_context_get_color (context, state, &color);
519 gdk_cairo_set_source_rgba (cr, &color);
522 /* Returns a GSList of (referenced) widgets encountered while drawing.
525 text_renderer_end (GtkTextRenderer *text_renderer)
527 GtkStyleContext *context;
528 GList *widgets = text_renderer->widgets;
530 cairo_restore (text_renderer->cr);
532 context = gtk_widget_get_style_context (text_renderer->widget);
534 gtk_style_context_restore (context);
536 text_renderer->widget = NULL;
537 text_renderer->cr = NULL;
539 text_renderer->widgets = NULL;
541 if (text_renderer->error_color)
543 gdk_color_free (text_renderer->error_color);
544 text_renderer->error_color = NULL;
550 static cairo_region_t *
551 get_selected_clip (GtkTextRenderer *text_renderer,
553 PangoLayoutLine *line,
562 cairo_region_t *clip_region = cairo_region_create ();
564 pango_layout_line_get_x_ranges (line, start_index, end_index, &ranges, &n_ranges);
566 for (i=0; i < n_ranges; i++)
570 rect.x = x + PANGO_PIXELS (ranges[2*i]);
572 rect.width = PANGO_PIXELS (ranges[2*i + 1]) - PANGO_PIXELS (ranges[2*i]);
573 rect.height = height;
575 cairo_region_union_rectangle (clip_region, &rect);
583 render_para (GtkTextRenderer *text_renderer,
584 GtkTextLineDisplay *line_display,
585 int selection_start_index,
586 int selection_end_index)
588 GtkStyleContext *context;
590 PangoLayout *layout = line_display->layout;
592 PangoLayoutIter *iter;
593 PangoRectangle layout_logical;
596 gboolean first = TRUE;
598 iter = pango_layout_get_iter (layout);
600 pango_layout_iter_get_layout_extents (iter, NULL, &layout_logical);
602 /* Adjust for margins */
604 layout_logical.x += line_display->x_offset * PANGO_SCALE;
605 layout_logical.y += line_display->top_margin * PANGO_SCALE;
607 screen_width = line_display->total_width;
609 context = gtk_widget_get_style_context (text_renderer->widget);
611 state = GTK_STATE_FLAG_SELECTED;
612 if (gtk_widget_has_focus (text_renderer->widget))
613 state |= GTK_STATE_FLAG_FOCUSED;
615 gtk_style_context_get_background_color (context, state, &selection);
619 PangoLayoutLine *line = pango_layout_iter_get_line_readonly (iter);
620 int selection_y, selection_height;
622 PangoRectangle line_rect;
624 gboolean at_last_line;
626 pango_layout_iter_get_line_extents (iter, NULL, &line_rect);
627 baseline = pango_layout_iter_get_baseline (iter);
628 pango_layout_iter_get_line_yrange (iter, &first_y, &last_y);
630 /* Adjust for margins */
632 line_rect.x += line_display->x_offset * PANGO_SCALE;
633 line_rect.y += line_display->top_margin * PANGO_SCALE;
634 baseline += line_display->top_margin * PANGO_SCALE;
636 /* Selection is the height of the line, plus top/bottom
637 * margin if we're the first/last line
639 selection_y = PANGO_PIXELS (first_y) + line_display->top_margin;
640 selection_height = PANGO_PIXELS (last_y) - PANGO_PIXELS (first_y);
644 selection_y -= line_display->top_margin;
645 selection_height += line_display->top_margin;
648 at_last_line = pango_layout_iter_at_last_line (iter);
650 selection_height += line_display->bottom_margin;
654 if (selection_start_index < byte_offset &&
655 selection_end_index > line->length + byte_offset) /* All selected */
657 cairo_t *cr = text_renderer->cr;
660 gdk_cairo_set_source_rgba (cr, &selection);
662 line_display->left_margin, selection_y,
663 screen_width, selection_height);
667 text_renderer_set_state (text_renderer, SELECTED);
668 pango_renderer_draw_layout_line (PANGO_RENDERER (text_renderer),
675 if (line_display->pg_bg_color)
677 cairo_t *cr = text_renderer->cr;
681 gdk_cairo_set_source_color (cr, line_display->pg_bg_color);
683 line_display->left_margin, selection_y,
684 screen_width, selection_height);
690 text_renderer_set_state (text_renderer, NORMAL);
691 pango_renderer_draw_layout_line (PANGO_RENDERER (text_renderer),
696 /* Check if some part of the line is selected; the newline
697 * that is after line->length for the last line of the
698 * paragraph counts as part of the line for this
700 if ((selection_start_index < byte_offset + line->length ||
701 (selection_start_index == byte_offset + line->length && pango_layout_iter_at_last_line (iter))) &&
702 selection_end_index > byte_offset)
704 cairo_t *cr = text_renderer->cr;
705 cairo_region_t *clip_region = get_selected_clip (text_renderer, layout, line,
706 line_display->x_offset,
709 selection_start_index, selection_end_index);
712 gdk_cairo_region (cr, clip_region);
714 cairo_region_destroy (clip_region);
716 gdk_cairo_set_source_rgba (cr, &selection);
718 PANGO_PIXELS (line_rect.x),
720 PANGO_PIXELS (line_rect.width),
724 text_renderer_set_state (text_renderer, SELECTED);
725 pango_renderer_draw_layout_line (PANGO_RENDERER (text_renderer),
732 /* Paint in the ends of the line */
733 if (line_rect.x > line_display->left_margin * PANGO_SCALE &&
734 ((line_display->direction == GTK_TEXT_DIR_LTR && selection_start_index < byte_offset) ||
735 (line_display->direction == GTK_TEXT_DIR_RTL && selection_end_index > byte_offset + line->length)))
739 gdk_cairo_set_source_rgba (cr, &selection);
741 line_display->left_margin,
743 PANGO_PIXELS (line_rect.x) - line_display->left_margin,
750 if (line_rect.x + line_rect.width <
751 (screen_width + line_display->left_margin) * PANGO_SCALE &&
752 ((line_display->direction == GTK_TEXT_DIR_LTR && selection_end_index > byte_offset + line->length) ||
753 (line_display->direction == GTK_TEXT_DIR_RTL && selection_start_index < byte_offset)))
758 line_display->left_margin + screen_width -
759 PANGO_PIXELS (line_rect.x) - PANGO_PIXELS (line_rect.width);
763 gdk_cairo_set_source_rgba (cr, &selection);
765 PANGO_PIXELS (line_rect.x) + PANGO_PIXELS (line_rect.width),
774 else if (line_display->has_block_cursor &&
775 gtk_widget_has_focus (text_renderer->widget) &&
776 byte_offset <= line_display->insert_index &&
777 (line_display->insert_index < byte_offset + line->length ||
778 (at_last_line && line_display->insert_index == byte_offset + line->length)))
780 GdkRectangle cursor_rect;
781 GdkRGBA cursor_color;
782 cairo_t *cr = text_renderer->cr;
784 /* we draw text using base color on filled cursor rectangle of cursor color
785 * (normally white on black) */
786 _gtk_style_context_get_cursor_color (context, &cursor_color, NULL);
788 cursor_rect.x = line_display->x_offset + line_display->block_cursor.x;
789 cursor_rect.y = line_display->block_cursor.y + line_display->top_margin;
790 cursor_rect.width = line_display->block_cursor.width;
791 cursor_rect.height = line_display->block_cursor.height;
795 gdk_cairo_rectangle (cr, &cursor_rect);
798 gdk_cairo_set_source_rgba (cr, &cursor_color);
801 /* draw text under the cursor if any */
802 if (!line_display->cursor_at_line_end)
806 state = gtk_widget_get_state_flags (text_renderer->widget);
807 gtk_style_context_get_background_color (context, state, &color);
809 gdk_cairo_set_source_rgba (cr, &color);
811 text_renderer_set_state (text_renderer, CURSOR);
813 pango_renderer_draw_layout_line (PANGO_RENDERER (text_renderer),
823 byte_offset += line->length;
825 while (pango_layout_iter_next_line (iter));
827 pango_layout_iter_free (iter);
830 static GtkTextRenderer *
831 get_text_renderer (void)
833 static GtkTextRenderer *text_renderer = NULL;
836 text_renderer = g_object_new (GTK_TYPE_TEXT_RENDERER, NULL);
838 return text_renderer;
842 gtk_text_layout_draw (GtkTextLayout *layout,
849 GtkTextRenderer *text_renderer;
850 GtkTextIter selection_start, selection_end;
851 gboolean have_selection = FALSE;
857 g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
858 g_return_if_fail (layout->default_style != NULL);
859 g_return_if_fail (layout->buffer != NULL);
860 g_return_if_fail (cr != NULL);
862 if (!gdk_cairo_get_clip_rectangle (cr, &clip))
865 line_list = gtk_text_layout_get_lines (layout, clip.y, clip.y + clip.height, &offset_y);
867 if (line_list == NULL)
868 return; /* nothing on the screen */
870 text_renderer = get_text_renderer ();
871 text_renderer_begin (text_renderer, widget, cr);
873 /* text_renderer_begin/end does cairo_save/restore */
874 cairo_translate (cr, 0, offset_y);
876 gtk_text_layout_wrap_loop_start (layout);
878 if (gtk_text_buffer_get_selection_bounds (layout->buffer,
881 have_selection = TRUE;
883 tmp_list = line_list;
884 while (tmp_list != NULL)
886 GtkTextLineDisplay *line_display;
887 gint selection_start_index = -1;
888 gint selection_end_index = -1;
889 gboolean have_strong;
892 GtkTextLine *line = tmp_list->data;
894 line_display = gtk_text_layout_get_line_display (layout, line, FALSE);
896 if (line_display->height > 0)
898 g_assert (line_display->layout != NULL);
902 GtkTextIter line_start, line_end;
905 gtk_text_layout_get_iter_at_line (layout,
908 line_end = line_start;
909 if (!gtk_text_iter_ends_line (&line_end))
910 gtk_text_iter_forward_to_line_end (&line_end);
911 byte_count = gtk_text_iter_get_visible_line_index (&line_end);
913 if (gtk_text_iter_compare (&selection_start, &line_end) <= 0 &&
914 gtk_text_iter_compare (&selection_end, &line_start) >= 0)
916 if (gtk_text_iter_compare (&selection_start, &line_start) >= 0)
917 selection_start_index = gtk_text_iter_get_visible_line_index (&selection_start);
919 selection_start_index = -1;
921 if (gtk_text_iter_compare (&selection_end, &line_end) <= 0)
922 selection_end_index = gtk_text_iter_get_visible_line_index (&selection_end);
924 selection_end_index = byte_count + 1; /* + 1 to flag past-the-end */
928 render_para (text_renderer, line_display,
929 selection_start_index, selection_end_index);
931 /* We paint the cursors last, because they overlap another chunk
932 and need to appear on top. */
937 cursor_list = line_display->cursors;
940 GtkTextCursorDisplay *cursor = cursor_list->data;
941 if (cursor->is_strong)
946 cursor_list = cursor_list->next;
949 cursor_list = line_display->cursors;
952 GtkTextCursorDisplay *cursor = cursor_list->data;
953 GtkTextDirection dir;
954 GdkRectangle cursor_location;
956 dir = line_display->direction;
957 if (have_strong && have_weak)
959 if (!cursor->is_strong)
960 dir = (dir == GTK_TEXT_DIR_RTL) ? GTK_TEXT_DIR_LTR : GTK_TEXT_DIR_RTL;
963 cursor_location.x = line_display->x_offset + cursor->x;
964 cursor_location.y = line_display->top_margin + cursor->y;
965 cursor_location.width = 0;
966 cursor_location.height = cursor->height;
968 gtk_draw_insertion_cursor (widget, cr, &cursor_location,
970 dir, have_strong && have_weak);
972 cursor_list = cursor_list->next;
974 } /* line_display->height > 0 */
976 cairo_translate (cr, 0, line_display->height);
977 gtk_text_layout_free_line_display (layout, line_display);
979 tmp_list = g_slist_next (tmp_list);
982 gtk_text_layout_wrap_loop_end (layout);
984 tmp_widgets = text_renderer_end (text_renderer);
986 *widgets = tmp_widgets;
989 g_list_foreach (tmp_widgets, (GFunc)g_object_unref, NULL);
990 g_list_free (tmp_widgets);
993 g_slist_free (line_list);