4 #include "chimara-glk-private.h"
8 extern GPrivate *glk_data_key;
11 window_new_common(glui32 rock)
13 ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
14 winid_t win = g_new0(struct glk_window_struct, 1);
16 win->magic = MAGIC_WINDOW;
18 if(glk_data->register_obj)
19 win->disprock = (*glk_data->register_obj)(win, gidisp_Class_Window);
21 win->window_node = g_node_new(win);
23 /* Every window has a window stream, but printing to it might have no effect */
24 win->window_stream = stream_new_common(0);
25 win->window_stream->file_mode = filemode_Write;
26 win->window_stream->type = STREAM_TYPE_WINDOW;
27 win->window_stream->window = win;
28 win->window_stream->style = "normal";
30 win->echo_stream = NULL;
31 win->input_request_type = INPUT_REQUEST_NONE;
32 win->line_input_buffer = NULL;
33 win->line_input_buffer_unicode = NULL;
36 /* Initialise the buffer */
37 win->buffer = g_string_sized_new(1024);
39 /* Initialise hyperlink table */
40 win->hyperlinks = g_hash_table_new_full(g_int_hash, g_int_equal, g_free, g_free);
45 /* Internal function: do all the stuff necessary to close a window. Call only
48 window_close_common(winid_t win, gboolean destroy_node)
50 ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
52 if(glk_data->unregister_obj)
54 (*glk_data->unregister_obj)(win, gidisp_Class_Window, win->disprock);
55 win->disprock.ptr = NULL;
59 g_node_destroy(win->window_node);
61 win->magic = MAGIC_FREE;
63 g_list_foreach(win->history, (GFunc)g_free, NULL);
64 g_list_free(win->history);
66 g_string_free(win->buffer, TRUE);
67 g_hash_table_destroy(win->hyperlinks);
68 g_free(win->current_hyperlink);
71 g_object_unref(win->pager_layout);
78 * @win: A window, or %NULL.
79 * @rockptr: Return location for the next window's rock, or %NULL.
81 * This function can be used to iterate through the list of all open windows
82 * (including pair windows.) See <link
83 * linkend="chimara-Iterating-Through-Opaque-Objects">Iterating Through Opaque
86 * As that section describes, the order in which windows are returned is
87 * arbitrary. The root window is not necessarily first, nor is it necessarily
90 * Returns: the next window, or %NULL if there are no more.
93 glk_window_iterate(winid_t win, glui32 *rockptr)
95 VALID_WINDOW_OR_NULL(win, return NULL);
97 ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
101 retnode = glk_data->root_window;
104 GNode *node = win->window_node;
105 if( G_NODE_IS_LEAF(node) )
107 while(node && node->next == NULL)
110 retnode = node->next;
115 retnode = g_node_first_child(node);
117 winid_t retval = retnode? (winid_t)retnode->data : NULL;
119 /* Store the window's rock in rockptr */
120 if(retval && rockptr)
121 *rockptr = glk_window_get_rock(retval);
127 * glk_window_get_rock:
130 * Returns @win's rock value. Pair windows always have rock 0; all other windows
131 * return whatever rock value you created them with.
133 * Returns: A rock value.
136 glk_window_get_rock(winid_t win)
138 VALID_WINDOW(win, return 0);
143 * glk_window_get_type:
146 * Returns @win's type, one of %wintype_Blank, %wintype_Pair,
147 * %wintype_TextBuffer, %wintype_TextGrid, or %wintype_Graphics.
149 * Returns: The window's type.
152 glk_window_get_type(winid_t win)
154 VALID_WINDOW(win, return 0);
159 * glk_window_get_parent:
162 * Returns the window which is the parent of @win. If @win is the root window,
163 * this returns %NULL, since the root window has no parent. Remember that the
164 * parent of every window is a pair window; other window types are always
167 * Returns: A window, or %NULL.
170 glk_window_get_parent(winid_t win)
172 VALID_WINDOW(win, return NULL);
173 /* Value will also be NULL if win is the root window */
174 return (winid_t)win->window_node->parent->data;
178 * glk_window_get_sibling:
181 * Returns the other child of @win's parent. If @win is the root window, this
184 * Returns: A window, or %NULL.
187 glk_window_get_sibling(winid_t win)
189 VALID_WINDOW(win, return NULL);
191 if(G_NODE_IS_ROOT(win->window_node))
193 if(win->window_node->next)
194 return (winid_t)win->window_node->next;
195 return (winid_t)win->window_node->prev;
199 * glk_window_get_root:
201 * Returns the root window. If there are no windows, this returns %NULL.
203 * Returns: A window, or %NULL.
206 glk_window_get_root()
208 ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
209 if(glk_data->root_window == NULL)
211 return (winid_t)glk_data->root_window->data;
216 * @split: The window to split to create the new window. Must be 0 if there
217 * are no windows yet.
218 * @method: Position of the new window and method of size computation. One of
219 * %winmethod_Above, %winmethod_Below, %winmethod_Left, or %winmethod_Right
220 * OR'ed with %winmethod_Fixed or %winmethod_Proportional. If @wintype is
221 * %wintype_Blank, then %winmethod_Fixed is not allowed.
222 * @size: Size of the new window, in percentage points if @method is
223 * %winmethod_Proportional, otherwise in characters if @wintype is
224 * %wintype_TextBuffer or %wintype_TextGrid, or pixels if @wintype is
226 * @wintype: Type of the new window. One of %wintype_Blank, %wintype_TextGrid,
227 * %wintype_TextBuffer, or %wintype_Graphics.
228 * @rock: The new window's rock value.
230 * Creates a new window. If there are no windows, the first three arguments are
231 * meaningless. @split <emphasis>must</emphasis> be 0, and @method and @size
232 * are ignored. @wintype is the type of window you're creating, and @rock is
233 * the rock (see <link linkend="chimara-Rocks">Rocks</link>).
235 * If any windows exist, new windows must be created by splitting existing
236 * ones. @split is the window you want to split; this <emphasis>must
237 * not</emphasis> be zero. @method is a mask of constants to specify the
238 * direction and the split method (see below). @size is the size of the split.
239 * @wintype is the type of window you're creating, and @rock is the rock.
241 * Remember that it is possible that the library will be unable to create a new
242 * window, in which case glk_window_open() will return %NULL.
245 * It is acceptable to gracefully exit, if the window you are creating is an
246 * important one — such as your first window. But you should not try to
247 * perform any window operation on the id until you have tested to make sure
251 * The examples we've seen so far have the simplest kind of size control. (Yes,
252 * this is <quote>below</quote>.) Every pair is a percentage split, with
255 * <mathphrase>X</mathphrase>
257 * percent going to one side, and
260 * <mathphrase>(100 - X)</mathphrase>
262 * percent going to the other side. If the player resizes the window, the whole
263 * mess expands, contracts, or stretches in a uniform way.
265 * As I said above, you can also make fixed-size splits. This is a little more
266 * complicated, because you have to know how this fixed size is measured.
268 * Sizes are measured in a way which is different for each window type. For
269 * example, a text grid window is measured by the size of its fixed-width font.
270 * You can make a text grid window which is fixed at a height of four rows, or
271 * ten columns. A text buffer window is measured by the size of its font.
274 * Remember that different windows may use different size fonts. Even two
275 * text grid windows may use fixed-size fonts of different sizes.
278 * Graphics windows are measured in pixels, not characters. Blank windows
279 * aren't measured at all; there's no meaningful way to measure them, and
280 * therefore you can't create a blank window of a fixed size, only of a
281 * proportional (percentage) size.
283 * So to create a text buffer window which takes the top 40% of the original
284 * window's space, you would execute
285 * |[ newwin = glk_window_open(win, winmethod_Above | winmethod_Proportional, 40, wintype_TextBuffer, 0); ]|
287 * To create a text grid which is always five lines high, at the bottom of the
288 * original window, you would do
289 * |[ newwin = glk_window_open(win, winmethod_Below | winmethod_Fixed, 5, wintype_TextGrid, 0); ]|
291 * Note that the meaning of the @size argument depends on the @method argument.
292 * If the method is %winmethod_Fixed, it also depends on the @wintype argument.
293 * The new window is then called the <quote>key window</quote> of this split,
294 * because its window type determines how the split size is computed.
297 * For %winmethod_Proportional splits, you can still call the new window the
298 * <quote>key window</quote>. But the key window is not important for
299 * proportional splits, because the size will always be computed as a simple
300 * ratio of the available space, not a fixed size of one child window.
303 * This system is more or less peachy as long as all the constraints work out.
304 * What happens when there is a conflict? The rules are simple. Size control
305 * always flows down the tree, and the player is at the top. Let's bring out an
307 * <informaltable frame="none"><tgroup cols="2"><tbody><row>
308 * <entry><mediaobject><imageobject><imagedata fileref="fig5-7a.png"/>
309 * </imageobject></mediaobject></entry>
310 * <entry><mediaobject><textobject><literallayout class="monospaced">
316 * </literallayout></textobject></mediaobject></entry>
317 * </row></tbody></tgroup></informaltable>
319 * First we split A into A and B, with a 50% proportional split. Then we split
320 * A into A and C, with C above, C being a text grid window, and C gets a fixed
321 * size of two rows (as measured in its own font size). A gets whatever remains
322 * of the 50% it had before.
324 * Now the player stretches the window vertically.
325 * <informalfigure><mediaobject><imageobject><imagedata fileref="fig6.png"/>
326 * </imageobject></mediaobject></informalfigure>
328 * The library figures: the topmost split, the original A/B split, is 50-50. So
329 * B gets half the screen space, and the pair window next to it (the lower
330 * <quote>O</quote>) gets the other half. Then it looks at the lower
331 * <quote>O</quote>. C gets two rows; A gets the rest. All done.
333 * Then the user maliciously starts squeezing the window down, in stages:
334 * <informaltable xml:id="chimara-Figure-Squeezing-Window" frame="none">
335 * <tgroup cols="5"><tbody><row valign="top">
336 * <entry><mediaobject><imageobject><imagedata fileref="fig5-7a.png"/>
337 * </imageobject></mediaobject></entry>
338 * <entry><mediaobject><imageobject><imagedata fileref="fig7b.png"/>
339 * </imageobject></mediaobject></entry>
340 * <entry><mediaobject><imageobject><imagedata fileref="fig7c.png"/>
341 * </imageobject></mediaobject></entry>
342 * <entry><mediaobject><imageobject><imagedata fileref="fig7d.png"/>
343 * </imageobject></mediaobject></entry>
344 * <entry><mediaobject><imageobject><imagedata fileref="fig7e.png"/>
345 * </imageobject></mediaobject></entry>
346 * </row></tbody></tgroup></informaltable>
348 * The logic remains the same. B always gets half the space. At stage 3,
349 * there's no room left for A, so it winds up with zero height. Nothing
350 * displayed in A will be visible. At stage 4, there isn't even room in the
351 * upper 50% to give C its two rows; so it only gets one. Finally, C is
352 * squashed out of existence as well.
354 * When a window winds up undersized, it remembers what size it should be. In
355 * the example above, A remembers that it should be two rows; if the user
356 * expands the window to the original size, it would return to the original
359 * The downward flow of control is a bit harsh. After all, in stage 4, there's
360 * room for C to have its two rows if only B would give up some of its 50%. But
361 * this does not happen.
364 * This makes life much easier for the Glk library. To determine the
365 * configuration of a window, it only needs to look at the window's
366 * ancestors, never at its descendants. So window layout is a simple
367 * recursive algorithm, no backtracking.
370 * What happens when you split a fixed-size window? The resulting pair window
371 * — that is, the two new parts together — retain the same size
372 * constraint as the original window that was split. The key window for the
373 * original split is still the key window for that split, even though it's now
374 * a grandchild instead of a child.
376 * The easy, and correct, way to think about this is that the size constraint
377 * is stored by a window's parent, not the window itself; and a constraint
378 * consists of a pointer to a key window plus a size value.
380 * <informaltable frame="none"><tgroup cols="6"><tbody><row>
381 * <entry><mediaobject><imageobject><imagedata fileref="fig8a.png"/>
382 * </imageobject></mediaobject></entry>
383 * <entry><mediaobject><textobject><literallayout class="monospaced">
385 * </literallayout></textobject></mediaobject></entry>
386 * <entry><mediaobject><imageobject><imagedata fileref="fig8b.png"/>
387 * </imageobject></mediaobject></entry>
388 * <entry><mediaobject><textobject><literallayout class="monospaced">
392 * </literallayout></textobject></mediaobject></entry>
393 * <entry><mediaobject><imageobject><imagedata fileref="fig8c.png"/>
394 * </imageobject></mediaobject></entry>
395 * <entry><mediaobject><textobject><literallayout class="monospaced">
401 * </literallayout></textobject></mediaobject></entry>
402 * </row></tbody></tgroup></informaltable>
403 * After the first split, the new pair window (O1, which covers the whole
404 * screen) knows that its first child (A) is above the second, and gets 50% of
405 * its own area. (A is the key window for this split, but a proportional split
406 * doesn't care about key windows.)
408 * After the second split, all this remains true; O1 knows that its first child
409 * gets 50% of its space, and A is O1's key window. But now O1's first child is
410 * O2 instead of A. The newer pair window (O2) knows that its first child (C)
411 * is above the second, and gets a fixed size of two rows. (As measured in C's
412 * font, because C is O2's key window.)
414 * If we split C, now, the resulting pair will still be two C-font rows high
415 * — that is, tall enough for two lines of whatever font C displays. For
416 * the sake of example, we'll do this vertically.
417 * <informaltable frame="none"><tgroup cols="2"><tbody><row>
418 * <entry><mediaobject><imageobject><imagedata fileref="fig9.png"/>
419 * </imageobject></mediaobject></entry>
420 * <entry><mediaobject><textobject><literallayout class="monospaced">
428 * </literallayout></textobject></mediaobject></entry>
429 * </row></tbody></tgroup></informaltable>
431 * O3 now knows that its children have a 50-50 left-right split. O2 is still
432 * committed to giving its upper child, O3, two C-font rows. Again, this is
433 * because C is O2's key window.
436 * This turns out to be a good idea, because it means that C, the text grid
437 * window, is still two rows high. If O3 had been a upper-lower split, things
438 * wouldn't work out so neatly. But the rules would still apply. If you don't
439 * like this, don't do it.
442 * Returns: the new window, or %NULL on error.
445 glk_window_open(winid_t split, glui32 method, glui32 size, glui32 wintype,
448 VALID_WINDOW_OR_NULL(split, return NULL);
449 g_return_val_if_fail(method == (method & (winmethod_DirMask | winmethod_DivisionMask)), NULL);
450 g_return_val_if_fail(!(((method & winmethod_DivisionMask) == winmethod_Proportional) && size > 100), NULL);
452 ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
454 if(split == NULL && glk_data->root_window != NULL)
456 ILLEGAL("Tried to open a new root window, but there is already a root window");
462 /* Create the new window */
463 winid_t win = window_new_common(rock);
470 /* A blank window will be a label without any text */
471 GtkWidget *label = gtk_label_new("");
472 gtk_widget_show(label);
476 /* A blank window has no size */
478 win->unit_height = 0;
482 case wintype_TextGrid:
484 GtkWidget *textview = gtk_text_view_new();
485 GtkTextBuffer *textbuffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(textview) );
487 gtk_text_view_set_wrap_mode( GTK_TEXT_VIEW(textview), GTK_WRAP_NONE );
488 gtk_text_view_set_editable( GTK_TEXT_VIEW(textview), FALSE );
489 gtk_widget_show(textview);
491 /* Create the styles available to the window stream */
492 style_init_textgrid(textbuffer);
493 gtk_widget_modify_font( textview, get_current_font(wintype) );
495 win->widget = textview;
496 win->frame = textview;
498 /* Determine the size of a "0" character in pixels */
499 PangoLayout *zero = gtk_widget_create_pango_layout(textview, "0");
500 pango_layout_set_font_description( zero, get_current_font(wintype) );
501 pango_layout_get_pixel_size(zero, &(win->unit_width), &(win->unit_height));
502 g_object_unref(zero);
503 /* width and height are set later */
505 /* Connect signal handlers */
506 win->char_input_keypress_handler = g_signal_connect(textview, "key-press-event", G_CALLBACK(on_char_input_key_press_event), win);
507 g_signal_handler_block(textview, win->char_input_keypress_handler);
508 win->line_input_keypress_handler = g_signal_connect(textview, "key-press-event", G_CALLBACK(on_line_input_key_press_event), win);
509 g_signal_handler_block(textview, win->line_input_keypress_handler);
510 win->shutdown_keypress_handler = g_signal_connect(textview, "key-press-event", G_CALLBACK(on_shutdown_key_press_event), win);
511 g_signal_handler_block(textview, win->shutdown_keypress_handler);
512 win->button_press_event_handler = g_signal_connect( textview, "button-press-event", G_CALLBACK(on_window_button_press), win );
513 g_signal_handler_block(textview, win->button_press_event_handler);
517 case wintype_TextBuffer:
519 GtkWidget *scrolledwindow = gtk_scrolled_window_new(NULL, NULL);
520 GtkWidget *textview = gtk_text_view_new();
521 GtkTextBuffer *textbuffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(textview) );
523 gtk_scrolled_window_set_policy( GTK_SCROLLED_WINDOW(scrolledwindow), GTK_POLICY_NEVER, GTK_POLICY_AUTOMATIC );
525 gtk_text_view_set_wrap_mode( GTK_TEXT_VIEW(textview), GTK_WRAP_WORD_CHAR );
526 gtk_text_view_set_editable( GTK_TEXT_VIEW(textview), FALSE );
527 gtk_text_view_set_pixels_inside_wrap( GTK_TEXT_VIEW(textview), 3 );
528 gtk_text_view_set_left_margin( GTK_TEXT_VIEW(textview), 20 );
529 gtk_text_view_set_right_margin( GTK_TEXT_VIEW(textview), 20 );
531 gtk_container_add( GTK_CONTAINER(scrolledwindow), textview );
532 gtk_widget_show_all(scrolledwindow);
534 win->widget = textview;
535 win->frame = scrolledwindow;
537 /* Create the styles available to the window stream */
538 style_init_textbuffer(textbuffer);
539 style_init_more_prompt(win);
540 gtk_widget_modify_font( textview, get_current_font(wintype) );
542 /* Determine the size of a "0" character in pixels */
543 PangoLayout *zero = gtk_widget_create_pango_layout(textview, "0");
544 pango_layout_set_font_description( zero, get_current_font(wintype) );
545 pango_layout_get_pixel_size(zero, &(win->unit_width), &(win->unit_height));
546 g_object_unref(zero);
548 /* Connect signal handlers */
551 /* "size-allocate"? Really? WTF, GTK? */
552 g_signal_connect_after( textview, "size-allocate", G_CALLBACK(pager_after_size_allocate), win );
553 win->pager_expose_handler = g_signal_connect_after( textview, "expose-event", G_CALLBACK(pager_on_expose), win );
554 g_signal_handler_block(textview, win->pager_expose_handler);
555 win->pager_keypress_handler = g_signal_connect( textview, "key-press-event", G_CALLBACK(pager_on_key_press_event), win );
556 g_signal_handler_block(textview, win->pager_keypress_handler);
557 //g_signal_connect_after( textbuffer, "insert-text", G_CALLBACK(pager_after_insert_text), win );
558 GtkAdjustment *adj = gtk_scrolled_window_get_vadjustment(GTK_SCROLLED_WINDOW(scrolledwindow));
559 g_signal_connect_after(adj, "value-changed", G_CALLBACK(pager_after_adjustment_changed), win);
561 /* Char and line input */
562 win->char_input_keypress_handler = g_signal_connect( textview, "key-press-event", G_CALLBACK(on_char_input_key_press_event), win );
563 g_signal_handler_block(textview, win->char_input_keypress_handler);
564 win->line_input_keypress_handler = g_signal_connect( textview, "key-press-event", G_CALLBACK(on_line_input_key_press_event), win );
565 g_signal_handler_block(textview, win->line_input_keypress_handler);
566 win->insert_text_handler = g_signal_connect_after( textbuffer, "insert-text", G_CALLBACK(after_window_insert_text), win );
567 g_signal_handler_block(textbuffer, win->insert_text_handler);
569 /* Shutdown key press */
570 win->shutdown_keypress_handler = g_signal_connect( textview, "key-press-event", G_CALLBACK(on_shutdown_key_press_event), win );
571 g_signal_handler_block(textview, win->shutdown_keypress_handler);
573 /* Create an editable tag to indicate uneditable parts of the window
575 gtk_text_buffer_create_tag(textbuffer, "uneditable", "editable", FALSE, "editable-set", TRUE, NULL);
577 /* Mark the position where the user will input text and the end mark */
579 gtk_text_buffer_get_end_iter(textbuffer, &end);
580 gtk_text_buffer_create_mark(textbuffer, "input_position", &end, TRUE);
581 gtk_text_buffer_create_mark(textbuffer, "end_position", &end, FALSE);
583 /* Create the pager position mark; it stands for the last character in the buffer
584 that has been on-screen */
585 gtk_text_buffer_create_mark(textbuffer, "pager_position", &end, TRUE);
589 case wintype_Graphics:
591 GtkWidget *image = gtk_image_new_from_pixmap(NULL, NULL);
592 gtk_widget_show(image);
595 win->unit_height = 1;
598 win->background_color = 0x00FFFFFF;
600 /* Connect signal handlers */
601 win->button_press_event_handler = g_signal_connect(image, "button-press-event", G_CALLBACK(on_window_button_press), win);
602 g_signal_handler_block(image, win->button_press_event_handler);
603 win->shutdown_keypress_handler = g_signal_connect(image, "key-press-event", G_CALLBACK(on_shutdown_key_press_event), win);
604 g_signal_handler_block(image, win->shutdown_keypress_handler);
605 win->size_allocate_handler = g_signal_connect(image, "size-allocate", G_CALLBACK(on_graphics_size_allocate), win);
611 ILLEGAL_PARAM("Unknown window type: %u", wintype);
613 g_node_destroy(glk_data->root_window);
614 glk_data->root_window = NULL;
618 /* Set the minimum size to "as small as possible" so it doesn't depend on
619 the size of the window contents */
620 gtk_widget_set_size_request(win->widget, 0, 0);
621 gtk_widget_set_size_request(win->frame, 0, 0);
625 /* When splitting, construct a new parent window
626 * copying most characteristics from the window that is being split */
627 winid_t pair = window_new_common(0);
628 pair->type = wintype_Pair;
630 /* The pair window must know about its children's split method */
631 pair->key_window = win;
632 pair->split_method = method;
633 pair->constraint_size = size;
635 /* Insert the new window into the window tree */
636 if(split->window_node->parent == NULL)
637 glk_data->root_window = pair->window_node;
640 if( split->window_node == g_node_first_sibling(split->window_node) )
641 g_node_prepend(split->window_node->parent, pair->window_node);
643 g_node_append(split->window_node->parent, pair->window_node);
644 g_node_unlink(split->window_node);
646 /* Place the windows in the correct order */
647 switch(method & winmethod_DirMask)
650 case winmethod_Above:
651 g_node_append(pair->window_node, win->window_node);
652 g_node_append(pair->window_node, split->window_node);
654 case winmethod_Right:
655 case winmethod_Below:
656 g_node_append(pair->window_node, split->window_node);
657 g_node_append(pair->window_node, win->window_node);
662 /* Set the window as root window */
663 glk_data->root_window = win->window_node;
666 /* Set the window as a child of the Glk widget, don't trigger an arrange event */
667 g_mutex_lock(glk_data->arrange_lock);
668 glk_data->needs_rearrange = TRUE;
669 glk_data->ignore_next_arrange_event = TRUE;
670 g_mutex_unlock(glk_data->arrange_lock);
671 gtk_widget_set_parent(win->frame, GTK_WIDGET(glk_data->self));
672 gtk_widget_queue_resize(GTK_WIDGET(glk_data->self));
674 /* For text grid windows, fill the buffer with blanks. */
675 if(wintype == wintype_TextGrid)
677 /* Create the cursor position mark */
679 GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
680 gtk_text_buffer_get_start_iter(buffer, &begin);
681 gtk_text_buffer_create_mark(buffer, "cursor_position", &begin, TRUE);
685 glk_window_clear(win);
689 /* Internal function: if node's key window is closing_win or one of its
690 children, set node's key window to NULL. */
692 remove_key_windows(GNode *node, winid_t closing_win)
694 winid_t win = (winid_t)node->data;
695 if(win->key_window && (win->key_window == closing_win || g_node_is_ancestor(closing_win->window_node, win->key_window->window_node)))
696 win->key_window = NULL;
697 return FALSE; /* Don't stop the traversal */
700 /* Internal function: destroy this window's GTK widgets, window streams,
701 and those of all its children. GDK threads must be locked. */
703 destroy_windows_below(winid_t win, stream_result_t *result)
708 case wintype_TextGrid:
709 case wintype_TextBuffer:
710 case wintype_Graphics:
711 gtk_widget_unparent(win->frame);
715 destroy_windows_below(win->window_node->children->data, NULL);
716 destroy_windows_below(win->window_node->children->next->data, NULL);
720 ILLEGAL_PARAM("Unknown window type: %u", win->type);
723 stream_close_common(win->window_stream, result);
726 /* Internal function: free the winid_t structure of this window and those of all its children */
728 free_winids_below(winid_t win)
730 if(win->type == wintype_Pair) {
731 free_winids_below(win->window_node->children->data);
732 free_winids_below(win->window_node->children->next->data);
734 window_close_common(win, FALSE);
739 * @win: Window to close.
740 * @result: Pointer to a #stream_result_t in which to store the write count.
742 * Closes @win, which is pretty much exactly the opposite of opening a window.
743 * It is legal to close all your windows, or to close the root window (which is
746 * The @result argument is filled with the output character count of the window
747 * stream. See <link linkend="chimara-Streams">Streams</link> and <link
748 * linkend="chimara-Closing-Streams">Closing Streams</link>.
750 * When you close a window (and it is not the root window), the other window
751 * in its pair takes over all the freed-up area. Let's close D, in the current
753 * <informaltable frame="none"><tgroup cols="2"><tbody><row>
754 * <entry><mediaobject><imageobject><imagedata fileref="fig10.png"/>
755 * </imageobject></mediaobject></entry>
756 * <entry><mediaobject><textobject><literallayout class="monospaced">
762 * </literallayout></textobject></mediaobject></entry>
763 * </row></tbody></tgroup></informaltable>
765 * Notice what has happened. D is gone. O3 is gone, and its 50-50 left-right
766 * split has gone with it. The other size constraints are unchanged; O2 is
767 * still committed to giving its upper child two rows, as measured in the font
768 * of O2's key window, which is C. Conveniently, O2's upper child is C, just as
769 * it was before we created D. In fact, now that D is gone, everything is back
770 * to the way it was before we created D.
772 * But what if we had closed C instead of D? We would have gotten this:
773 * <informaltable frame="none"><tgroup cols="2"><tbody><row>
774 * <entry><mediaobject><imageobject><imagedata fileref="fig11.png"/>
775 * </imageobject></mediaobject></entry>
776 * <entry><mediaobject><textobject><literallayout class="monospaced">
782 * </literallayout></textobject></mediaobject></entry>
783 * </row></tbody></tgroup></informaltable>
785 * Again, O3 is gone. But D has collapsed to zero height. This is because its
786 * height is controlled by O2, and O2's key window was C, and C is now gone. O2
787 * no longer has a key window at all, so it cannot compute a height for its
788 * upper child, so it defaults to zero.
791 * This may seem to be an inconvenient choice. That is deliberate. You should
792 * not leave a pair window with no key, and the zero-height default reminds
793 * you not to. You can use glk_window_set_arrangement() to set a new split
794 * measurement and key window. See <link
795 * linkend="chimara-Changing-Window-Constraints">Changing Window
796 * Constraints</link>.
800 glk_window_close(winid_t win, stream_result_t *result)
802 VALID_WINDOW(win, return);
804 ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
806 gdk_threads_enter(); /* Prevent redraw while we're trashing the window */
808 /* If any pair windows have this window or its children as a key window,
809 set their key window to NULL */
810 g_node_traverse(glk_data->root_window, G_IN_ORDER, G_TRAVERSE_NON_LEAVES, -1, (GNodeTraverseFunc)remove_key_windows, win);
812 /* Close all the window streams and destroy the widgets of this window
813 and below, before trashing the window tree */
814 destroy_windows_below(win, result);
816 /* Then free the winid_t structures below this node, but not this one itself */
817 if(win->type == wintype_Pair) {
818 free_winids_below(win->window_node->children->data);
819 free_winids_below(win->window_node->children->next->data);
821 /* So now we should be left with a skeleton tree hanging off this node */
823 /* Parent window changes from a split window into the sibling window */
824 /* The parent of any window is either a pair window or NULL */
825 GNode *pair_node = win->window_node->parent;
826 /* If win was not the root window: */
827 if(pair_node != NULL)
829 gboolean new_child_on_left = ( pair_node == g_node_first_sibling(pair_node) );
831 /* Lookup our sibling */
832 GNode *sibling_node = pair_node->children;
833 if(sibling_node == win->window_node)
834 sibling_node = sibling_node->next;
836 GNode *new_parent_node = pair_node->parent;
837 g_node_unlink(pair_node);
838 g_node_unlink(sibling_node);
839 /* pair_node and sibling_node should now be totally unconnected to the tree */
841 if(new_parent_node == NULL)
843 glk_data->root_window = sibling_node;
847 if(new_child_on_left)
848 g_node_prepend(new_parent_node, sibling_node);
850 g_node_append(new_parent_node, sibling_node);
853 stream_close_common( ((winid_t) pair_node->data)->window_stream, NULL );
854 window_close_common( (winid_t) pair_node->data, TRUE);
856 else /* it was the root window */
858 glk_data->root_window = NULL;
861 window_close_common(win, FALSE);
863 /* Schedule a redraw */
864 g_mutex_lock(glk_data->arrange_lock);
865 glk_data->needs_rearrange = TRUE;
866 glk_data->ignore_next_arrange_event = TRUE;
867 g_mutex_unlock(glk_data->arrange_lock);
868 gtk_widget_queue_resize( GTK_WIDGET(glk_data->self) );
876 * Erases @win. The meaning of this depends on the window type.
879 * <term>Text buffer</term>
881 * This may do any number of things, such as delete all text in the window, or
882 * print enough blank lines to scroll all text beyond visibility, or insert a
883 * page-break marker which is treated specially by the display part of the
888 * <term>Text grid</term>
890 * This will clear the window, filling all positions with blanks. The window
891 * cursor is moved to the top left corner (position 0,0).
895 * <term>Graphics</term>
897 * Clears the entire window to its current background color. See <link
898 * linkend="chimara-The-Types-of-Windows#wintype-Graphics">Graphics
903 * <term>Other window types</term>
904 * <listitem><para>No effect.</para></listitem>
908 * It is illegal to erase a window which has line input pending.
911 glk_window_clear(winid_t win)
913 VALID_WINDOW(win, return);
914 g_return_if_fail(win->input_request_type != INPUT_REQUEST_LINE && win->input_request_type != INPUT_REQUEST_LINE_UNICODE);
916 ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
925 case wintype_TextGrid:
926 /* fill the buffer with blanks */
928 /* Wait for the window's size to be updated */
929 g_mutex_lock(glk_data->arrange_lock);
930 if(glk_data->needs_rearrange)
931 g_cond_wait(glk_data->rearranged, glk_data->arrange_lock);
932 g_mutex_unlock(glk_data->arrange_lock);
936 /* Manually put newlines at the end of each row of characters in the buffer; manual newlines make resizing the window's grid easier. */
937 gchar *blanks = g_strnfill(win->width, ' ');
938 gchar **blanklines = g_new0(gchar *, win->height + 1);
940 for(count = 0; count < win->height; count++)
941 blanklines[count] = blanks;
942 blanklines[win->height] = NULL;
943 gchar *text = g_strjoinv("\n", blanklines);
944 g_free(blanklines); /* not g_strfreev() */
947 GtkTextBuffer *textbuffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
948 gtk_text_buffer_set_text(textbuffer, text, -1);
952 gtk_text_buffer_get_start_iter(textbuffer, &begin);
953 gtk_text_buffer_move_mark_by_name(textbuffer, "cursor_position", &begin);
959 case wintype_TextBuffer:
960 /* delete all text in the window */
964 GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
965 GtkTextIter start, end;
966 gtk_text_buffer_get_bounds(buffer, &start, &end);
967 gtk_text_buffer_delete(buffer, &start, &end);
973 case wintype_Graphics:
975 /* Wait for the window's size to be updated */
976 g_mutex_lock(glk_data->arrange_lock);
977 if(glk_data->needs_rearrange)
978 g_cond_wait(glk_data->rearranged, glk_data->arrange_lock);
979 g_mutex_unlock(glk_data->arrange_lock);
981 glk_window_erase_rect(win, 0, 0, win->widget->allocation.width, win->widget->allocation.height);
986 ILLEGAL_PARAM("Unknown window type: %d", win->type);
992 * @win: A window, or %NULL.
994 * Sets the current stream to @win's window stream. It is exactly equivalent to
995 * |[ glk_stream_set_current(glk_window_get_stream(win)) ]|
996 * See <link linkend="chimara-Streams">Streams</link>.
998 * <note><title>Chimara</title>
1000 * Although this is not mentioned in the specification, @win may also be
1001 * %NULL, in which case the current stream is also set to %NULL.
1005 glk_set_window(winid_t win)
1007 VALID_WINDOW_OR_NULL(win, return);
1009 glk_stream_set_current( glk_window_get_stream(win) );
1011 glk_stream_set_current(NULL);
1015 * glk_window_get_stream:
1018 * Returns the stream which is associated with @win. (See <link
1019 * linkend="chimara-Window-Streams">Window Streams</link>.) Every window has a
1020 * stream which can be printed to, but this may not be useful, depending on the
1024 * For example, printing to a blank window's stream has no effect.
1027 * Returns: A window stream.
1029 strid_t glk_window_get_stream(winid_t win)
1031 VALID_WINDOW(win, return NULL);
1032 return win->window_stream;
1036 * glk_window_set_echo_stream:
1038 * @str: A stream to attach to the window, or %NULL.
1040 * Sets @win's echo stream to @str, which can be any valid output stream. You
1041 * can reset a window to stop echoing by calling
1042 * <code>#glk_window_set_echo_stream(@win, %NULL)</code>.
1044 * It is illegal to set a window's echo stream to be its
1045 * <emphasis>own</emphasis> window stream. That would create an infinite loop,
1046 * and is nearly certain to crash the Glk library. It is similarly illegal to
1047 * create a longer loop (two or more windows echoing to each other.)
1050 glk_window_set_echo_stream(winid_t win, strid_t str)
1052 VALID_WINDOW(win, return);
1053 VALID_STREAM_OR_NULL(str, return);
1055 /* Test for an infinite loop */
1057 for(; next && next->type == STREAM_TYPE_WINDOW; next = next->window->echo_stream)
1059 if(next == win->window_stream)
1061 ILLEGAL("Infinite loop detected");
1062 win->echo_stream = NULL;
1067 win->echo_stream = str;
1071 * glk_window_get_echo_stream:
1074 * Returns the echo stream of window @win. Initially, a window has no echo
1075 * stream, so <code>#glk_window_get_echo_stream(@win)</code> will return %NULL.
1077 * Returns: A stream, or %NULL.
1080 glk_window_get_echo_stream(winid_t win)
1082 VALID_WINDOW(win, return NULL);
1083 return win->echo_stream;
1087 * glk_window_get_size:
1089 * @widthptr: Pointer to a location to store the window's width, or %NULL.
1090 * @heightptr: Pointer to a location to store the window's height, or %NULL.
1092 * Simply returns the actual size of the window, in its measurement system.
1093 * As described in <link linkend="chimara-Other-API-Conventions">Other API
1094 * Conventions</link>, either @widthptr or @heightptr can be %NULL, if you
1095 * only want one measurement.
1097 * <note><para>Or, in fact, both, if you want to waste time.</para></note>
1100 glk_window_get_size(winid_t win, glui32 *widthptr, glui32 *heightptr)
1102 VALID_WINDOW(win, return);
1104 ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
1110 if(widthptr != NULL)
1112 if(heightptr != NULL)
1116 case wintype_TextGrid:
1117 /* Wait until the window's size is current */
1118 g_mutex_lock(glk_data->arrange_lock);
1119 if(glk_data->needs_rearrange)
1120 g_cond_wait(glk_data->rearranged, glk_data->arrange_lock);
1121 g_mutex_unlock(glk_data->arrange_lock);
1123 gdk_threads_enter();
1124 /* Cache the width and height */
1125 win->width = (glui32)(win->widget->allocation.width / win->unit_width);
1126 win->height = (glui32)(win->widget->allocation.height / win->unit_height);
1127 gdk_threads_leave();
1129 if(widthptr != NULL)
1130 *widthptr = win->width;
1131 if(heightptr != NULL)
1132 *heightptr = win->height;
1135 case wintype_TextBuffer:
1136 /* Wait until the window's size is current */
1137 g_mutex_lock(glk_data->arrange_lock);
1138 if(glk_data->needs_rearrange)
1139 g_cond_wait(glk_data->rearranged, glk_data->arrange_lock);
1140 g_mutex_unlock(glk_data->arrange_lock);
1142 gdk_threads_enter();
1143 if(widthptr != NULL)
1144 *widthptr = (glui32)(win->widget->allocation.width / win->unit_width);
1145 if(heightptr != NULL)
1146 *heightptr = (glui32)(win->widget->allocation.height / win->unit_height);
1147 gdk_threads_leave();
1151 case wintype_Graphics:
1152 g_mutex_lock(glk_data->arrange_lock);
1153 if(glk_data->needs_rearrange)
1154 g_cond_wait(glk_data->rearranged, glk_data->arrange_lock);
1155 g_mutex_unlock(glk_data->arrange_lock);
1157 gdk_threads_enter();
1158 if(widthptr != NULL)
1159 *widthptr = (glui32)(win->widget->allocation.width);
1160 if(heightptr != NULL)
1161 *heightptr = (glui32)(win->widget->allocation.height);
1162 gdk_threads_leave();
1167 ILLEGAL_PARAM("Unknown window type: %u", win->type);
1172 * glk_window_set_arrangement:
1173 * @win: a pair window to rearrange.
1174 * @method: new method of size computation. One of %winmethod_Above,
1175 * %winmethod_Below, %winmethod_Left, or %winmethod_Right OR'ed with
1176 * %winmethod_Fixed or %winmethod_Proportional.
1177 * @size: new size constraint, in percentage points if @method is
1178 * %winmethod_Proportional, otherwise in characters if @win's type is
1179 * %wintype_TextBuffer or %wintype_TextGrid, or pixels if @win's type is
1180 * %wintype_Graphics.
1181 * @keywin: new key window, or %NULL to leave the key window unchanged.
1183 * Changes the size of an existing split — that is, it changes the
1184 * constraint of a given pair window.
1186 * Consider the example above, where D has collapsed to zero height. Say D was a
1187 * text buffer window. You could make a more useful layout by doing
1190 * o2 = glk_window_get_parent(d);
1191 * glk_window_set_arrangement(o2, winmethod_Above | winmethod_Fixed, 3, d);
1193 * That would set D (the upper child of O2) to be O2's key window, and give it a
1194 * fixed size of 3 rows.
1196 * If you later wanted to expand D, you could do
1197 * |[ glk_window_set_arrangement(o2, winmethod_Above | winmethod_Fixed, 5, NULL); ]|
1198 * That expands D to five rows. Note that, since O2's key window is already set
1199 * to D, it is not necessary to provide the @keywin argument; you can pass %NULL
1200 * to mean <quote>leave the key window unchanged.</quote>
1202 * If you do change the key window of a pair window, the new key window
1203 * <emphasis>must</emphasis> be a descendant of that pair window. In the current
1204 * example, you could change O2's key window to be A, but not B. The key window
1205 * also cannot be a pair window itself.
1207 * |[ glk_window_set_arrangement(o2, winmethod_Below | winmethod_Fixed, 3, NULL); ]|
1208 * This changes the constraint to be on the <emphasis>lower</emphasis> child of
1209 * O2, which is A. The key window is still D; so A would then be three rows high
1210 * as measured in D's font, and D would get the rest of O2's space. That may not
1211 * be what you want. To set A to be three rows high as measured in A's font, you
1213 * |[ glk_window_set_arrangement(o2, winmethod_Below | winmethod_Fixed, 3, a); ]|
1215 * Or you could change O2 to a proportional split:
1216 * |[ glk_window_set_arrangement(o2, winmethod_Below | winmethod_Proportional, 30, NULL); ]|
1218 * |[ glk_window_set_arrangement(o2, winmethod_Above | winmethod_Proportional, 70, NULL); ]|
1219 * These do exactly the same thing, since 30% above is the same as
1220 * 70% below. You don't need to specify a key window with a proportional
1221 * split, so the @keywin argument is %NULL. (You could actually specify either A
1222 * or D as the key window, but it wouldn't affect the result.)
1224 * Whatever constraint you set, glk_window_get_size() will tell you the actual
1225 * window size you got.
1227 * Note that you can resize windows, but you can't flip or rotate them. You
1228 * can't move A above D, or change O2 to a vertical split where A is left or
1231 * To get this effect you could close one of the windows, and re-split the
1232 * other one with glk_window_open().
1236 glk_window_set_arrangement(winid_t win, glui32 method, glui32 size, winid_t keywin)
1238 VALID_WINDOW(win, return);
1239 VALID_WINDOW_OR_NULL(keywin, return);
1240 g_return_if_fail(win->type == wintype_Pair);
1243 g_return_if_fail(keywin->type != wintype_Pair);
1244 g_return_if_fail(g_node_is_ancestor(win->window_node, keywin->window_node));
1246 g_return_if_fail(method == (method & (winmethod_DirMask | winmethod_DivisionMask)));
1247 g_return_if_fail(!(((method & winmethod_DivisionMask) == winmethod_Proportional) && size > 100));
1249 ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
1251 win->split_method = method;
1252 win->constraint_size = size;
1254 win->key_window = keywin;
1256 /* Tell GTK to rearrange the windows */
1257 gdk_threads_enter();
1258 g_mutex_lock(glk_data->arrange_lock);
1259 glk_data->needs_rearrange = TRUE;
1260 glk_data->ignore_next_arrange_event = TRUE;
1261 g_mutex_unlock(glk_data->arrange_lock);
1262 gtk_widget_queue_resize(GTK_WIDGET(glk_data->self));
1263 gdk_threads_leave();
1267 * glk_window_get_arrangement:
1268 * @win: a pair window.
1269 * @methodptr: return location for the constraint flags of @win, or %NULL.
1270 * @sizeptr: return location for the constraint size of @win, or %NULL.
1271 * @keywinptr: return location for the key window of @win, or %NULL.
1273 * Queries the constraint of a given pair window.
1276 glk_window_get_arrangement(winid_t win, glui32 *methodptr, glui32 *sizeptr, winid_t *keywinptr)
1278 VALID_WINDOW(win, return);
1279 g_return_if_fail(win->type == wintype_Pair);
1282 *methodptr = win->split_method;
1284 *sizeptr = win->constraint_size;
1286 *keywinptr = win->key_window;
1290 * glk_window_move_cursor:
1291 * @win: A text grid window.
1292 * @xpos: Horizontal cursor position.
1293 * @ypos: Vertical cursor position.
1295 * Sets the cursor position. If you move the cursor right past the end of a
1296 * line, it wraps; the next character which is printed will appear at the
1297 * beginning of the next line.
1299 * If you move the cursor below the last line, or when the cursor reaches the
1300 * end of the last line, it goes <quote>off the screen</quote> and further
1301 * output has no effect. You must call glk_window_move_cursor() or
1302 * glk_window_clear() to move the cursor back into the visible region.
1305 * Note that the arguments of glk_window_move_cursor() are <type>unsigned
1306 * int</type>s. This is okay, since there are no negative positions. If you try
1307 * to pass a negative value, Glk will interpret it as a huge positive value,
1308 * and it will wrap or go off the last line.
1312 * Also note that the output cursor is not necessarily visible. In particular,
1313 * when you are requesting line or character input in a grid window, you cannot
1314 * rely on the cursor position to prompt the player where input is indicated.
1315 * You should print some character prompt at that spot — a
1316 * <quote>></quote> character, for example.
1320 glk_window_move_cursor(winid_t win, glui32 xpos, glui32 ypos)
1322 VALID_WINDOW(win, return);
1323 g_return_if_fail(win->type == wintype_TextGrid);
1325 flush_window_buffer(win);
1327 ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
1329 /* Wait until the window's size is current */
1330 g_mutex_lock(glk_data->arrange_lock);
1331 if(glk_data->needs_rearrange)
1332 g_cond_wait(glk_data->rearranged, glk_data->arrange_lock);
1333 g_mutex_unlock(glk_data->arrange_lock);
1335 /* Don't do anything if the window is shrunk down to nothing */
1336 if(win->width == 0 || win->height == 0)
1339 /* Calculate actual position if cursor is moved past the right edge */
1340 if(xpos >= win->width)
1342 ypos += xpos / win->width;
1346 /* Go to the end if the cursor is moved off the bottom edge */
1347 if(ypos >= win->height)
1349 xpos = win->width - 1;
1350 ypos = win->height - 1;
1353 gdk_threads_enter();
1355 GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
1357 /* There must actually be a character at xpos, or the following function will choke */
1358 gtk_text_buffer_get_iter_at_line_offset(buffer, &newpos, ypos, xpos);
1359 gtk_text_buffer_move_mark_by_name(buffer, "cursor_position", &newpos);
1361 gdk_threads_leave();