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[darcs-mirror-screen-message.debian.git] / sm.c
1 /*
2 #     sm.c
3 #     Copyright (C) 2006 - 2012 Joachim Breitner
4 #
5 #     The Code for making a window fullscreen was taken from src/fullscreen.c in
6 #     the geeqie package:
7 #     Copyright (C) 2004 John Ellis
8 #                   2008 - 2010 The Geeqie Team
9 #
10 #     This program is free software; you can redistribute it and/or modify
11 #     it under the terms of the GNU General Public License as published by
12 #     the Free Software Foundation; either version 2 of the License, or
13 #     (at your option) any later version.
14 #
15 #     This program is distributed in the hope that it will be useful,
16 #     but WITHOUT ANY WARRANTY; without even the implied warranty of
17 #     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18 #     GNU General Public License for more details.
19 #
20 #     You should have received a copy of the GNU General Public License
21 #     along with this program; if not, write to the Free Software
22 #     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
23 */
24
25 #include <gtk/gtk.h>
26 #include <gdk/gdk.h>
27 #include <pango/pango.h>
28 #include <string.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <math.h>
32
33 #include "config.h"
34
35 #ifndef _GNU_SOURCE
36 #define _GNU_SOURCE                             /* for getopt_long */
37 #endif
38 #include <getopt.h>
39
40 #define min(x,y) ((x) < (y) ? (x) : (y))
41
42 #define AUTOHIDE_TIMEOUT 3
43
44 static gboolean quality = TRUE;
45
46 static int timeout_id=0;
47
48 static GtkWidget* window;
49 static GtkWidget* draw;
50 static GdkCursor *cursor;
51 static GtkWidget* quit;
52 static GtkWidget* tv;
53 static GtkWidget* entry_widget;
54 static GtkSettings* settings;
55 static GtkTextBuffer* tb;
56 static PangoFontDescription *font;
57 static PangoLayout* layout;
58 static char *foreground = NULL;
59 static char *background = NULL;
60 static char *fontdesc = NULL;
61 static int rotation = 0; // 0 = normal, 1 = left, 2 = inverted, 3 = right
62 static GString *partial_input;
63 static gulong text_change_handler;
64
65 gboolean hide_entry(gpointer *user_data) {
66         gtk_widget_hide(entry_widget);
67         gtk_widget_grab_focus(draw);
68         gtk_widget_queue_draw(draw);
69         gdk_window_set_cursor(GTK_WIDGET(draw)->window, cursor);
70         return FALSE;
71 }
72
73 static void show_entry() {
74         if (timeout_id) {
75                 g_source_remove(timeout_id);
76                 timeout_id = 0;
77         }
78         gtk_widget_show(entry_widget);
79         gtk_widget_grab_focus(tv);
80         gdk_window_set_cursor(GTK_WIDGET(draw)->window, NULL);
81
82         timeout_id = g_timeout_add_seconds (AUTOHIDE_TIMEOUT, (GSourceFunc)hide_entry, NULL);
83 }
84
85 static void clear_text(GtkAccelGroup *accel, GObject *window, guint keyval,  GdkModifierType modifier) {
86         if( gtk_text_buffer_get_char_count(tb) ) {
87                 gtk_text_buffer_set_text(tb,"",-1);
88                 show_entry();
89         } else {
90                 gtk_main_quit();
91         }
92 }
93
94 static char *get_text() {
95         GtkTextIter start, end;
96         gtk_text_buffer_get_start_iter(tb,&start);
97         gtk_text_buffer_get_end_iter(tb,&end);
98         return gtk_text_buffer_get_text(tb, &start, &end, FALSE);
99 }
100
101 static void hq(gboolean q, gboolean force){
102         if (q != quality) 
103                 if (q)
104                         gtk_settings_set_long_property(settings,"gtk-xft-antialias",1,"Hier halt");
105                 else
106                         gtk_settings_set_long_property(settings,"gtk-xft-antialias",0,"Hier halt");
107         else
108                 if (force)
109                         gtk_widget_queue_draw(draw);
110
111         quality = q;
112 }
113
114 static void redraw() {
115         const char *text = pango_layout_get_text(layout);
116         if (strlen(text) > 0) {
117                 GdkGC *gc = gtk_widget_get_style(draw)->fg_gc[GTK_STATE_NORMAL];
118                 int w1, h1;
119                 pango_layout_get_pixel_size(layout, &w1, &h1);
120                 if (w1>0 && h1>0) {
121                         int w2 = window->allocation.width;
122                         int h2 = window->allocation.height;
123
124                         int rw1, rh1;
125                         if (rotation == 0 || rotation == 2) {
126                                 rw1 = w1;
127                                 rh1 = h1;
128                         } else {
129                                 rw1 = h1;
130                                 rh1 = w1;
131                         }
132
133                         double s = min ((double)w2/rw1, (double)h2/rh1);
134                         
135
136                         PangoMatrix matrix = PANGO_MATRIX_INIT;
137                         // Move matrix to the screen center
138                         pango_matrix_translate(&matrix, w2/2, h2/2);
139                         // Scale as required
140                         pango_matrix_scale(&matrix, s, s);
141                         // Rotate if needed
142                         pango_matrix_rotate (&matrix, rotation * 90);
143                         // Move matrix so that text will be centered
144                         //pango_matrix_translate(&matrix, -w1/2, -h1/2);
145                         
146                         // Apply matrix
147                         PangoContext *context =  pango_layout_get_context(layout);
148                         pango_context_set_matrix (context, &matrix);
149                         pango_layout_context_changed (layout);
150
151                         gdk_draw_layout(draw->window, gc,
152                                 (w2-(s*rw1))/2, (h2-(s*rh1))/2,layout);
153                         
154                         // Reset matrix
155                         PangoMatrix matrix2 = PANGO_MATRIX_INIT;
156                         pango_context_set_matrix (context, &matrix2);
157                         pango_layout_context_changed (layout);
158
159                         hq(TRUE, FALSE);
160                 }
161         }
162 }
163
164 static gboolean text_keypress(GtkWidget *widget, GdkEventButton *event, gpointer *user_data) {
165         // forward signal to the text view
166         gboolean ret;
167         g_signal_emit_by_name(tv, "key-press-event", event, &ret);
168         gtk_widget_grab_focus(tv);
169         return ret;
170 }
171
172 static gboolean text_clicked(GtkWidget *widget, GdkEventButton *event, gpointer *user_data) {
173         show_entry();
174         if (event->type == GDK_BUTTON_PRESS && event->button == 2) {
175                 GtkClipboard *cb = gtk_clipboard_get(GDK_SELECTION_PRIMARY);
176
177                 gchar *txt = gtk_clipboard_wait_for_text(cb);
178                 if (txt != NULL) {
179                         gtk_text_buffer_set_text(tb,txt,-1);
180                         g_free(txt);
181                 }
182
183         }
184         return FALSE;
185 }
186
187 static gboolean read_chan(GIOChannel *chan, GIOCondition condition, gpointer data){
188         gchar buf[1024];
189         GString *input;
190         GIOStatus stat = G_IO_STATUS_NORMAL;
191         gsize read;
192         GError *err = NULL;
193
194         while ((stat = g_io_channel_read_chars(chan, buf, sizeof(buf), &read, &err)) == G_IO_STATUS_NORMAL && err == NULL) {
195                 g_string_append_len(partial_input, buf, read);
196         }
197
198         if (err != NULL)
199         {
200             fprintf (stderr, "Unable to read stdin: %s\n", err->message);
201             g_error_free (err);
202             return TRUE;
203         }
204
205
206         if (stat == G_IO_STATUS_EOF) {
207                 // There is an end of file, so use the whole input
208                 input = g_string_new_len(partial_input->str, partial_input->len);
209                 g_string_truncate(partial_input, 0);
210         } else {
211                 // There is no end of file. Check for form feed characters.
212                 // Use from the second-to-last to the last.
213                 char *last_ff = strrchr(partial_input->str, '\f');
214                 if (last_ff) {
215                         *last_ff = '\0';
216                         char *snd_last_ff = strrchr(partial_input->str, '\f');
217                         if (snd_last_ff == NULL) snd_last_ff = partial_input->str;
218                         input = g_string_new_len(snd_last_ff, last_ff - snd_last_ff);
219                         g_string_erase(partial_input, 0, last_ff - partial_input->str + 1);
220                 } else {
221                         return TRUE;
222                 }
223         }
224
225         // remove beginning and trailing newlines, if any
226         gssize cnt = 0;
227         while ((input->len > cnt) && (input->str[cnt] == '\n')) {
228                 cnt++;
229         }
230         g_string_erase(input, 0, cnt);
231
232         while ((input->len > 0) && (input->str[input->len - 1] == '\n')) {
233                 g_string_truncate(input, input->len - 1);
234         }
235
236         g_signal_handler_block (tb, text_change_handler);
237         gtk_text_buffer_set_text (tb, input->str, input->len);
238         g_signal_handler_unblock (tb, text_change_handler);
239
240         g_string_free(input, TRUE);
241
242         if (stat == G_IO_STATUS_AGAIN)
243                 return TRUE;
244         else
245                 return FALSE;
246 }
247
248 static void newtext() {
249         pango_layout_set_text(layout, get_text(), -1);
250         hq(FALSE, TRUE);
251 }
252
253 static void newtext_show_input() {
254         show_entry();
255 }
256
257 static void move_cursor(GtkTextView* tv, GtkMovementStep step, gint count, gboolean extend_selection, gpointer user_data) {
258         show_entry();
259 }
260
261 static struct option const long_options[] =
262 {
263         {"help",       no_argument,       NULL, 'h'},
264         {"version",    no_argument,       NULL, 'V'},
265         {"foreground", required_argument, NULL, 'f'},
266         {"background", required_argument, NULL, 'b'},
267         {"font",       required_argument, NULL, 'n'},
268         {"rotate",     required_argument, NULL, 'r'},
269         {0,0,0,0}
270 };
271
272 static void usage(char *cmd) {
273         printf("Usage: %s [-h|--help] [-V|--version] [-f|--foreground=colordesc] [-b|--background=colordesc] [-n|--font=fontdesc] [-r|--rotate=0,1,2,3]\n", cmd);
274 }
275
276 static void version() {
277         printf("%s\n", PACKAGE_STRING);
278 }
279
280 int main(int argc, char **argv) {
281         GString *input;
282         int c;
283         int input_provided = 0;
284
285         while ((c = getopt_long (argc, argv, "hVf:b:n:r:", long_options, (int *) 0)) != EOF) {
286                 switch (c) {
287                         case 'h':
288                                 usage(argv[0]);
289                                 return 0;
290                                 break;
291
292                         case 'V':
293                                 version();
294                                 return 0;
295                                 break;
296
297                         case 'f':
298                                 foreground = optarg;
299                                 break;
300
301                         case 'b':
302                                 background = optarg;
303                                 break;
304
305                         case 'n':
306                                 fontdesc = optarg;
307                                 break;
308                         case 'r':
309                                 rotation = atoi(optarg);
310                                 break;
311                         default:
312                                 /* unknown switch received - at least
313                                  * give usage but continue and use the
314                                  * data */
315                                 usage(argv[0]);
316                                 break;
317                 }
318         }
319
320         gtk_init(&argc, &argv);
321
322         window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
323         gtk_window_set_decorated(GTK_WINDOW(window), FALSE);
324         gtk_window_set_resizable(GTK_WINDOW(window), FALSE);
325         gtk_window_set_icon_name (GTK_WINDOW (window), "sm");
326
327         GdkScreen *screen = gtk_window_get_screen(GTK_WINDOW(window));
328         int w = gdk_screen_get_width(screen);
329         int h = gdk_screen_get_height(screen);
330
331         GdkGeometry geometry;
332         geometry.min_width = w;
333         geometry.min_height = h;
334         geometry.max_width = w;
335         geometry.max_height = h;
336         geometry.base_width = w;
337         geometry.base_height = h;
338         geometry.win_gravity = GDK_GRAVITY_STATIC;
339         gtk_window_set_geometry_hints(GTK_WINDOW(window), window, &geometry,
340                                       GDK_HINT_MIN_SIZE |
341                                       GDK_HINT_MAX_SIZE |
342                                       GDK_HINT_BASE_SIZE |
343                                       GDK_HINT_WIN_GRAVITY |
344                                       GDK_HINT_USER_POS);
345         gtk_window_set_default_size(GTK_WINDOW(window), w, h);
346         gtk_window_move(GTK_WINDOW(window), 0, 0);
347
348
349         g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
350
351         settings = gtk_settings_get_default();
352         GdkColormap *colormap = gtk_widget_get_colormap(GTK_WIDGET(window));
353         GdkColor white, black;
354         gdk_colormap_alloc_color(colormap, &white, TRUE, TRUE);
355         gdk_colormap_alloc_color(colormap, &black, TRUE, TRUE);
356         if (foreground != NULL) {
357                 gdk_color_parse(foreground, &black);
358         } else {
359                 gdk_color_parse("black", &black);
360         }
361         if (background != NULL) {
362                 gdk_color_parse(background, &white);
363         } else {
364                 gdk_color_parse("white", &white);
365         }
366
367         draw = gtk_drawing_area_new();
368         gtk_widget_set_events(draw, GDK_BUTTON_PRESS_MASK|GDK_KEY_PRESS_MASK);
369         gtk_widget_set_size_request(draw,400,400);
370         gtk_widget_modify_bg(draw, GTK_STATE_NORMAL, &white);
371         gtk_widget_modify_fg(draw, GTK_STATE_NORMAL, &black);
372         g_signal_connect(G_OBJECT(draw), "button-press-event", G_CALLBACK(text_clicked), NULL);
373         g_signal_connect(G_OBJECT(draw), "key-press-event", G_CALLBACK(text_keypress), NULL);
374         gtk_widget_set_can_focus(draw, TRUE);
375
376         GdkPixmap *pixmap = gdk_pixmap_new(NULL, 1, 1, 1);
377         GdkColor color;
378         cursor = gdk_cursor_new_from_pixmap(pixmap, pixmap, &color, &color, 0, 0);
379
380         tv = gtk_text_view_new();
381         tb = gtk_text_view_get_buffer(GTK_TEXT_VIEW(tv));
382
383         partial_input = g_string_new("");
384
385         if (argc > optind)
386                 if (!strcmp(argv[optind], "-") ) {
387                         // read from stdin
388                         GIOChannel *chan = g_io_channel_unix_new(0);
389                         g_io_channel_set_flags(chan, G_IO_FLAG_NONBLOCK, NULL);
390                         g_io_add_watch (chan, G_IO_IN | G_IO_HUP, &read_chan, NULL);
391
392                         input = g_string_new("");
393                         input_provided++;
394                 } else {
395                         int i;
396
397                         input = g_string_new("");
398
399                         for (i = optind; i < argc; i++) {
400                                 g_string_append(input, argv[i]);
401
402                                 if (i < argc - 1) {
403                                         g_string_append(input, " ");
404                                 }
405                         }
406                         input_provided++;
407                 }
408         else
409                 input = g_string_new(":-)");
410
411         gtk_text_buffer_set_text(tb, input->str, input->len);
412         g_string_free(input, TRUE);
413         GtkTextIter start, end;
414         gtk_text_buffer_get_bounds(tb, &start, &end);
415         gtk_text_buffer_select_range(tb, &start, &end);
416
417         quit = gtk_button_new_from_stock(GTK_STOCK_QUIT);
418         g_signal_connect(G_OBJECT(quit), "clicked", G_CALLBACK(gtk_main_quit), NULL);
419
420         GtkWidget *vbox_button = gtk_vbox_new(FALSE, 0);
421         gtk_box_pack_end(GTK_BOX(vbox_button), quit, FALSE, FALSE, 0);
422
423         GtkWidget *hbox = gtk_hbox_new(FALSE,0);
424         entry_widget = hbox;
425         gtk_box_pack_start(GTK_BOX(hbox), tv,   TRUE,  TRUE,  0);
426         gtk_box_pack_start(GTK_BOX(hbox), vbox_button, FALSE, FALSE, 0);
427
428         GtkWidget *vbox = gtk_vbox_new(FALSE,0);
429         gtk_box_pack_start(GTK_BOX(vbox), draw, TRUE, TRUE, 0);
430         gtk_box_pack_end(GTK_BOX(vbox), hbox, FALSE, FALSE, 0);
431
432         gtk_container_add(GTK_CONTAINER(window), vbox);
433
434         font = pango_font_description_new();
435         if (fontdesc != NULL) {
436                 pango_font_description_set_family(font, fontdesc);
437         } else {
438                 pango_font_description_set_family(font, "sans-serif");
439         }
440         pango_font_description_set_size(font, 200*PANGO_SCALE);
441
442         layout = gtk_widget_create_pango_layout(window,get_text());
443         pango_layout_set_font_description(layout, font);
444         pango_layout_set_alignment(layout,PANGO_ALIGN_CENTER);
445
446         GtkAccelGroup *accel = gtk_accel_group_new();
447         guint key;
448         GdkModifierType mod;
449         gtk_accelerator_parse("<Ctrl>Q", &key, &mod);
450         gtk_accel_group_connect(accel, key, mod, 0, g_cclosure_new(G_CALLBACK(gtk_main_quit), NULL, NULL));
451         gtk_accelerator_parse("Escape", &key, &mod);
452         gtk_accel_group_connect(accel, key, mod, 0, g_cclosure_new(G_CALLBACK(clear_text), NULL, NULL));
453         gtk_window_add_accel_group(GTK_WINDOW(window), accel);
454         gtk_widget_show_all(window);
455
456         g_signal_connect_after(G_OBJECT(draw), "expose-event", G_CALLBACK(redraw), NULL);
457         text_change_handler = g_signal_connect(G_OBJECT(tb), "changed", G_CALLBACK(newtext_show_input), NULL);
458         g_signal_connect(G_OBJECT(tb), "changed", G_CALLBACK(newtext), NULL);
459         g_signal_connect(G_OBJECT(tv), "move-cursor", G_CALLBACK(move_cursor), NULL);
460
461         if (!input_provided)
462                 show_entry();
463         else
464                 hide_entry(NULL);
465
466         gtk_main();
467
468         return 0;
469 }