3 #include "chimara-glk-private.h"
5 extern ChimaraGlkPrivate *glk_data;
9 * @win: A window, or %NULL.
10 * @rockptr: Return location for the next window's rock, or %NULL.
12 * This function can be used to iterate through the list of all open windows
13 * (including pair windows.) See <link
14 * linkend="chimara-Iterating-Through-Opaque-Objects">Iterating Through Opaque
17 * As that section describes, the order in which windows are returned is
18 * arbitrary. The root window is not necessarily first, nor is it necessarily
21 * Returns: the next window, or %NULL if there are no more.
24 glk_window_iterate(winid_t win, glui32 *rockptr)
26 VALID_WINDOW_OR_NULL(win, return NULL);
31 retnode = glk_data->root_window;
34 GNode *node = win->window_node;
35 if( G_NODE_IS_LEAF(node) )
37 while(node && node->next == NULL)
45 retnode = g_node_first_child(node);
47 winid_t retval = retnode? (winid_t)retnode->data : NULL;
49 /* Store the window's rock in rockptr */
51 *rockptr = glk_window_get_rock(retval);
57 * glk_window_get_rock:
60 * Returns @win's rock value. Pair windows always have rock 0; all other windows
61 * return whatever rock value you created them with.
63 * Returns: A rock value.
66 glk_window_get_rock(winid_t win)
68 VALID_WINDOW(win, return 0);
73 * glk_window_get_type:
76 * Returns @win's type, one of #wintype_Blank, #wintype_Pair,
77 * #wintype_TextBuffer, #wintype_TextGrid, or #wintype_Graphics.
79 * Returns: The window's type.
82 glk_window_get_type(winid_t win)
84 VALID_WINDOW(win, return 0);
89 * glk_window_get_parent:
92 * Returns the window which is the parent of @win. If @win is the root window,
93 * this returns %NULL, since the root window has no parent. Remember that the
94 * parent of every window is a pair window; other window types are always
97 * Returns: A window, or %NULL.
100 glk_window_get_parent(winid_t win)
102 VALID_WINDOW(win, return NULL);
103 /* Value will also be NULL if win is the root window */
104 return (winid_t)win->window_node->parent->data;
108 * glk_window_get_sibling:
111 * Returns the other child of @win's parent. If @win is the root window, this
114 * Returns: A window, or %NULL.
117 glk_window_get_sibling(winid_t win)
119 VALID_WINDOW(win, return NULL);
121 if(G_NODE_IS_ROOT(win->window_node))
123 if(win->window_node->next)
124 return (winid_t)win->window_node->next;
125 return (winid_t)win->window_node->prev;
129 * glk_window_get_root:
131 * Returns the root window. If there are no windows, this returns %NULL.
133 * Returns: A window, or %NULL.
136 glk_window_get_root()
138 if(glk_data->root_window == NULL)
140 return (winid_t)glk_data->root_window->data;
145 * @split: The window to split to create the new window. Must be 0 if there
146 * are no windows yet.
147 * @method: Position of the new window and method of size computation. One of
148 * #winmethod_Above, #winmethod_Below, #winmethod_Left, or #winmethod_Right
149 * OR'ed with #winmethod_Fixed or #winmethod_Proportional. If @wintype is
150 * #wintype_Blank, then #winmethod_Fixed is not allowed.
151 * @size: Size of the new window, in percentage points if @method is
152 * #winmethod_Proportional, otherwise in characters if @wintype is
153 * #wintype_TextBuffer or #wintype_TextGrid, or pixels if @wintype is
155 * @wintype: Type of the new window. One of #wintype_Blank, #wintype_TextGrid,
156 * #wintype_TextBuffer, or #wintype_Graphics.
157 * @rock: The new window's rock value.
159 * Creates a new window. If there are no windows, the first three arguments are
160 * meaningless. @split <emphasis>must</emphasis> be 0, and @method and @size
161 * are ignored. @wintype is the type of window you're creating, and @rock is
162 * the rock (see <link linkend="chimara-Rocks">Rocks</link>).
164 * If any windows exist, new windows must be created by splitting existing
165 * ones. @split is the window you want to split; this <emphasis>must
166 * not</emphasis> be zero. @method is a mask of constants to specify the
167 * direction and the split method (see below). @size is the size of the split.
168 * @wintype is the type of window you're creating, and @rock is the rock.
170 * Remember that it is possible that the library will be unable to create a new
171 * window, in which case glk_window_open() will return %NULL.
174 * It is acceptable to gracefully exit, if the window you are creating is an
175 * important one — such as your first window. But you should not try to
176 * perform any window operation on the id until you have tested to make sure
180 * The examples we've seen so far have the simplest kind of size control. (Yes,
181 * this is <quote>below</quote>.) Every pair is a percentage split, with
184 * <mathphrase>X</mathphrase>
186 * percent going to one side, and
189 * <mathphrase>(100 - X)</mathphrase>
191 * percent going to the other side. If the player resizes the window, the whole
192 * mess expands, contracts, or stretches in a uniform way.
194 * As I said above, you can also make fixed-size splits. This is a little more
195 * complicated, because you have to know how this fixed size is measured.
197 * Sizes are measured in a way which is different for each window type. For
198 * example, a text grid window is measured by the size of its fixed-width font.
199 * You can make a text grid window which is fixed at a height of four rows, or
200 * ten columns. A text buffer window is measured by the size of its font.
203 * Remember that different windows may use different size fonts. Even two
204 * text grid windows may use fixed-size fonts of different sizes.
207 * Graphics windows are measured in pixels, not characters. Blank windows
208 * aren't measured at all; there's no meaningful way to measure them, and
209 * therefore you can't create a blank window of a fixed size, only of a
210 * proportional (percentage) size.
212 * So to create a text buffer window which takes the top 40% of the original
213 * window's space, you would execute
214 * <informalexample><programlisting>
215 * newwin = #glk_window_open(win, #winmethod_Above | #winmethod_Proportional, 40, #wintype_TextBuffer, 0);
216 * </programlisting></informalexample>
218 * To create a text grid which is always five lines high, at the bottom of the
219 * original window, you would do
220 * <informalexample><programlisting>
221 * newwin = #glk_window_open(win, #winmethod_Below | #winmethod_Fixed, 5, #wintype_TextGrid, 0);
222 * </programlisting></informalexample>
224 * Note that the meaning of the @size argument depends on the @method argument.
225 * If the method is #winmethod_Fixed, it also depends on the @wintype argument.
226 * The new window is then called the <quote>key window</quote> of this split,
227 * because its window type determines how the split size is computed.
230 * For #winmethod_Proportional splits, you can still call the new window the
231 * <quote>key window</quote>. But the key window is not important for
232 * proportional splits, because the size will always be computed as a simple
233 * ratio of the available space, not a fixed size of one child window.
236 * This system is more or less peachy as long as all the constraints work out.
237 * What happens when there is a conflict? The rules are simple. Size control
238 * always flows down the tree, and the player is at the top. Let's bring out an
240 * <informaltable frame="none"><tgroup cols="2"><tbody><row>
241 * <entry><mediaobject><imageobject><imagedata fileref="fig5-7a.png"/>
242 * </imageobject></mediaobject></entry>
243 * <entry><mediaobject><textobject><literallayout class="monospaced">
249 * </literallayout></textobject></mediaobject></entry>
250 * </row></tbody></tgroup></informaltable>
252 * First we split A into A and B, with a 50% proportional split. Then we split
253 * A into A and C, with C above, C being a text grid window, and C gets a fixed
254 * size of two rows (as measured in its own font size). A gets whatever remains
255 * of the 50% it had before.
257 * Now the player stretches the window vertically.
258 * <informalfigure><mediaobject><imageobject><imagedata fileref="fig6.png"/>
259 * </imageobject></mediaobject></informalfigure>
261 * The library figures: the topmost split, the original A/B split, is 50-50. So
262 * B gets half the screen space, and the pair window next to it (the lower
263 * <quote>O</quote>) gets the other half. Then it looks at the lower
264 * <quote>O</quote>. C gets two rows; A gets the rest. All done.
266 * Then the user maliciously starts squeezing the window down, in stages:
267 * <informaltable frame="none"><tgroup cols="5"><tbody><row valign="top">
268 * <entry><mediaobject><imageobject><imagedata fileref="fig5-7a.png"/>
269 * </imageobject></mediaobject></entry>
270 * <entry><mediaobject><imageobject><imagedata fileref="fig7b.png"/>
271 * </imageobject></mediaobject></entry>
272 * <entry><mediaobject><imageobject><imagedata fileref="fig7c.png"/>
273 * </imageobject></mediaobject></entry>
274 * <entry><mediaobject><imageobject><imagedata fileref="fig7d.png"/>
275 * </imageobject></mediaobject></entry>
276 * <entry><mediaobject><imageobject><imagedata fileref="fig7e.png"/>
277 * </imageobject></mediaobject></entry>
278 * </row></tbody></tgroup></informaltable>
280 * The logic remains the same. B always gets half the space. At stage 3,
281 * there's no room left for A, so it winds up with zero height. Nothing
282 * displayed in A will be visible. At stage 4, there isn't even room in the
283 * upper 50% to give C its two rows; so it only gets one. Finally, C is
284 * squashed out of existence as well.
286 * When a window winds up undersized, it remembers what size it should be. In
287 * the example above, A remembers that it should be two rows; if the user
288 * expands the window to the original size, it would return to the original
291 * The downward flow of control is a bit harsh. After all, in stage 4, there's
292 * room for C to have its two rows if only B would give up some of its 50%. But
293 * this does not happen.
296 * This makes life much easier for the Glk library. To determine the
297 * configuration of a window, it only needs to look at the window's
298 * ancestors, never at its descendants. So window layout is a simple
299 * recursive algorithm, no backtracking.
302 * What happens when you split a fixed-size window? The resulting pair window
303 * — that is, the two new parts together — retain the same size
304 * constraint as the original window that was split. The key window for the
305 * original split is still the key window for that split, even though it's now
306 * a grandchild instead of a child.
308 * The easy, and correct, way to think about this is that the size constraint
309 * is stored by a window's parent, not the window itself; and a constraint
310 * consists of a pointer to a key window plus a size value.
312 * <informaltable frame="none"><tgroup cols="6"><tbody><row>
313 * <entry><mediaobject><imageobject><imagedata fileref="fig8a.png"/>
314 * </imageobject></mediaobject></entry>
315 * <entry><mediaobject><textobject><literallayout class="monospaced">
317 * </literallayout></textobject></mediaobject></entry>
318 * <entry><mediaobject><imageobject><imagedata fileref="fig8b.png"/>
319 * </imageobject></mediaobject></entry>
320 * <entry><mediaobject><textobject><literallayout class="monospaced">
324 * </literallayout></textobject></mediaobject></entry>
325 * <entry><mediaobject><imageobject><imagedata fileref="fig8c.png"/>
326 * </imageobject></mediaobject></entry>
327 * <entry><mediaobject><textobject><literallayout class="monospaced">
333 * </literallayout></textobject></mediaobject></entry>
334 * </row></tbody></tgroup></informaltable>
335 * After the first split, the new pair window (O1, which covers the whole
336 * screen) knows that its first child (A) is above the second, and gets 50% of
337 * its own area. (A is the key window for this split, but a proportional split
338 * doesn't care about key windows.)
340 * After the second split, all this remains true; O1 knows that its first child
341 * gets 50% of its space, and A is O1's key window. But now O1's first child is
342 * O2 instead of A. The newer pair window (O2) knows that its first child (C)
343 * is above the second, and gets a fixed size of two rows. (As measured in C's
344 * font, because C is O2's key window.)
346 * If we split C, now, the resulting pair will still be two C-font rows high
347 * — that is, tall enough for two lines of whatever font C displays. For
348 * the sake of example, we'll do this vertically.
349 * <informaltable frame="none"><tgroup cols="2"><tbody><row>
350 * <entry><mediaobject><imageobject><imagedata fileref="fig9.png"/>
351 * </imageobject></mediaobject></entry>
352 * <entry><mediaobject><textobject><literallayout class="monospaced">
360 * </literallayout></textobject></mediaobject></entry>
361 * </row></tbody></tgroup></informaltable>
363 * O3 now knows that its children have a 50-50 left-right split. O2 is still
364 * committed to giving its upper child, O3, two C-font rows. Again, this is
365 * because C is O2's key window.
368 * This turns out to be a good idea, because it means that C, the text grid
369 * window, is still two rows high. If O3 had been a upper-lower split, things
370 * wouldn't work out so neatly. But the rules would still apply. If you don't
371 * like this, don't do it.
374 * Returns: the new window, or %NULL on error.
377 glk_window_open(winid_t split, glui32 method, glui32 size, glui32 wintype,
380 VALID_WINDOW_OR_NULL(split, return NULL);
382 if(split == NULL && glk_data->root_window != NULL)
384 ILLEGAL("Tried to open a new root window, but there is already a root window");
390 /* Create the new window */
391 winid_t win = g_new0(struct glk_window_struct, 1);
392 win->magic = MAGIC_WINDOW;
395 win->window_node = g_node_new(win);
401 /* A blank window will be a label without any text */
402 GtkWidget *label = gtk_label_new("");
403 gtk_widget_show(label);
407 /* A blank window has no size */
409 win->unit_height = 0;
410 /* You can print to a blank window's stream, but it does nothing */
411 win->window_stream = window_stream_new(win);
412 win->echo_stream = NULL;
416 case wintype_TextGrid:
418 GtkWidget *textview = gtk_text_view_new();
420 gtk_text_view_set_wrap_mode( GTK_TEXT_VIEW(textview), GTK_WRAP_CHAR );
421 gtk_text_view_set_editable( GTK_TEXT_VIEW(textview), FALSE );
422 gtk_widget_show(textview);
424 /* Set the window's font */
425 gtk_widget_modify_font(textview, glk_data->monospace_font_desc);
427 win->widget = textview;
428 win->frame = textview;
430 /* Determine the size of a "0" character in pixels */
431 PangoLayout *zero = gtk_widget_create_pango_layout(textview, "0");
432 pango_layout_set_font_description(zero, glk_data->monospace_font_desc);
433 pango_layout_get_pixel_size(zero, &(win->unit_width), &(win->unit_height));
434 g_object_unref(zero);
436 /* Set the other parameters (width and height are set later) */
437 win->window_stream = window_stream_new(win);
438 win->echo_stream = NULL;
439 win->input_request_type = INPUT_REQUEST_NONE;
440 win->line_input_buffer = NULL;
441 win->line_input_buffer_unicode = NULL;
443 /* Connect signal handlers */
444 win->keypress_handler = g_signal_connect( G_OBJECT(textview), "key-press-event", G_CALLBACK(on_window_key_press_event), win );
445 g_signal_handler_block( G_OBJECT(textview), win->keypress_handler );
449 case wintype_TextBuffer:
451 GtkWidget *scrolledwindow = gtk_scrolled_window_new(NULL, NULL);
452 GtkWidget *textview = gtk_text_view_new();
453 GtkTextBuffer *textbuffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(textview) );
455 gtk_scrolled_window_set_policy( GTK_SCROLLED_WINDOW(scrolledwindow), GTK_POLICY_NEVER, GTK_POLICY_AUTOMATIC );
457 gtk_text_view_set_wrap_mode( GTK_TEXT_VIEW(textview), GTK_WRAP_WORD_CHAR );
458 gtk_text_view_set_editable( GTK_TEXT_VIEW(textview), FALSE );
460 gtk_container_add( GTK_CONTAINER(scrolledwindow), textview );
461 gtk_widget_show_all(scrolledwindow);
463 /* Set the window's font */
464 gtk_widget_modify_font(textview, glk_data->default_font_desc);
466 win->widget = textview;
467 win->frame = scrolledwindow;
469 /* Determine the size of a "0" character in pixels */
470 PangoLayout *zero = gtk_widget_create_pango_layout(textview, "0");
471 pango_layout_set_font_description(zero, glk_data->default_font_desc);
472 pango_layout_get_pixel_size(zero, &(win->unit_width), &(win->unit_height));
473 g_object_unref(zero);
475 /* Set the other parameters */
476 win->window_stream = window_stream_new(win);
477 win->echo_stream = NULL;
478 win->input_request_type = INPUT_REQUEST_NONE;
479 win->line_input_buffer = NULL;
480 win->line_input_buffer_unicode = NULL;
482 /* Connect signal handlers */
483 win->keypress_handler = g_signal_connect( G_OBJECT(textview), "key-press-event", G_CALLBACK(on_window_key_press_event), win );
484 g_signal_handler_block( G_OBJECT(textview), win->keypress_handler );
486 win->insert_text_handler = g_signal_connect_after( G_OBJECT(textbuffer), "insert-text", G_CALLBACK(after_window_insert_text), win );
487 g_signal_handler_block( G_OBJECT(textbuffer), win->insert_text_handler );
489 /* Create an editable tag to indicate uneditable parts of the window
491 gtk_text_buffer_create_tag(textbuffer, "uneditable", "editable", FALSE, "editable-set", TRUE, NULL);
493 /* Mark the position where the user will input text */
495 gtk_text_buffer_get_end_iter(textbuffer, &end);
496 gtk_text_buffer_create_mark(textbuffer, "input_position", &end, TRUE);
502 ILLEGAL_PARAM("Unknown window type: %u", wintype);
504 g_node_destroy(glk_data->root_window);
505 glk_data->root_window = NULL;
509 /* Set the minimum size to "as small as possible" so it doesn't depend on
510 the size of the window contents */
511 gtk_widget_set_size_request(win->widget, 0, 0);
512 gtk_widget_set_size_request(win->frame, 0, 0);
516 /* When splitting, construct a new parent window
517 * copying most characteristics from the window that is being split */
518 winid_t pair = g_new0(struct glk_window_struct, 1);
519 pair->magic = MAGIC_WINDOW;
521 pair->type = wintype_Pair;
522 pair->window_node = g_node_new(pair);
523 /* You can print to a pair window's window stream, but it has no effect */
524 pair->window_stream = window_stream_new(pair);
525 pair->echo_stream = NULL;
527 /* The pair window must know about its children's split method */
528 pair->key_window = win;
529 pair->split_method = method;
530 pair->constraint_size = size;
532 /* Insert the new window into the window tree */
533 if(split->window_node->parent == NULL)
534 glk_data->root_window = pair->window_node;
537 if( split->window_node == g_node_first_sibling(split->window_node) )
538 g_node_prepend(split->window_node->parent, pair->window_node);
540 g_node_append(split->window_node->parent, pair->window_node);
541 g_node_unlink(split->window_node);
543 /* Place the windows in the correct order */
544 switch(method & winmethod_DirMask)
547 case winmethod_Above:
548 g_node_append(pair->window_node, win->window_node);
549 g_node_append(pair->window_node, split->window_node);
551 case winmethod_Right:
552 case winmethod_Below:
553 g_node_append(pair->window_node, split->window_node);
554 g_node_append(pair->window_node, win->window_node);
559 /* Set the window as root window */
560 glk_data->root_window = win->window_node;
563 /* Set the window as a child of the Glk widget */
564 gtk_widget_set_parent(win->frame, GTK_WIDGET(glk_data->self));
565 gtk_widget_queue_resize(GTK_WIDGET(glk_data->self));
569 /* For blank or pair windows, this is almost a no-op. For text grid and
570 text buffer windows, this will wait for GTK to draw the window. Otherwise,
571 opening a window and getting its size immediately will give you the wrong
573 glk_window_get_size(win, NULL, NULL);
575 /* For text grid windows, fill the buffer with blanks. */
576 if(wintype == wintype_TextGrid)
578 /* Create the cursor position mark */
581 GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
582 gtk_text_buffer_get_start_iter(buffer, &begin);
583 gtk_text_buffer_create_mark(buffer, "cursor_position", &begin, TRUE);
586 /* Fill the buffer with blanks and move the cursor to the upper left */
587 glk_window_clear(win);
593 /* Internal function: if node's key window is closing_win or one of its
594 children, set node's key window to NULL. */
596 remove_key_windows(GNode *node, winid_t closing_win)
598 winid_t win = (winid_t)node->data;
599 if(win->key_window && (win->key_window == closing_win || g_node_is_ancestor(closing_win->window_node, win->key_window->window_node)))
600 win->key_window = NULL;
601 return FALSE; /* Don't stop the traversal */
604 /* Internal function: destroy this window's GTK widgets, window streams,
605 and those of all its children */
607 destroy_windows_below(winid_t win, stream_result_t *result)
613 gtk_widget_unparent(win->widget);
617 case wintype_TextGrid:
618 case wintype_TextBuffer:
620 gtk_widget_unparent(win->frame);
622 /* TODO: Cancel all input requests */
626 destroy_windows_below(win->window_node->children->data, NULL);
627 destroy_windows_below(win->window_node->children->next->data, NULL);
631 ILLEGAL_PARAM("Unknown window type: %u", win->type);
634 stream_close_common(win->window_stream, result);
637 /* Internal function: free the winid_t structure of this window and those of all its children */
639 free_winids_below(winid_t win)
641 if(win->type == wintype_Pair) {
642 free_winids_below(win->window_node->children->data);
643 free_winids_below(win->window_node->children->next->data);
645 win->magic = MAGIC_FREE;
651 * @win: Window to close.
652 * @result: Pointer to a #stream_result_t in which to store the write count.
654 * Closes @win, which is pretty much exactly the opposite of opening a window.
655 * It is legal to close all your windows, or to close the root window (which is
658 * The @result argument is filled with the output character count of the window
659 * stream. See <link linkend="chimara-Streams">Streams</link> and <link
660 * linkend="chimara-Closing-Streams">Closing Streams</link>.
662 * When you close a window (and it is not the root window), the other window
663 * in its pair takes over all the freed-up area. Let's close D, in the current
665 * <informaltable frame="none"><tgroup cols="2"><tbody><row>
666 * <entry><mediaobject><imageobject><imagedata fileref="fig10.png"/>
667 * </imageobject></mediaobject></entry>
668 * <entry><mediaobject><textobject><literallayout class="monospaced">
674 * </literallayout></textobject></mediaobject></entry>
675 * </row></tbody></tgroup></informaltable>
677 * Notice what has happened. D is gone. O3 is gone, and its 50-50 left-right
678 * split has gone with it. The other size constraints are unchanged; O2 is
679 * still committed to giving its upper child two rows, as measured in the font
680 * of O2's key window, which is C. Conveniently, O2's upper child is C, just as
681 * it was before we created D. In fact, now that D is gone, everything is back
682 * to the way it was before we created D.
684 * But what if we had closed C instead of D? We would have gotten this:
685 * <informaltable frame="none"><tgroup cols="2"><tbody><row>
686 * <entry><mediaobject><imageobject><imagedata fileref="fig11.png"/>
687 * </imageobject></mediaobject></entry>
688 * <entry><mediaobject><textobject><literallayout class="monospaced">
694 * </literallayout></textobject></mediaobject></entry>
695 * </row></tbody></tgroup></informaltable>
697 * Again, O3 is gone. But D has collapsed to zero height. This is because its
698 * height is controlled by O2, and O2's key window was C, and C is now gone. O2
699 * no longer has a key window at all, so it cannot compute a height for its
700 * upper child, so it defaults to zero.
703 * This may seem to be an inconvenient choice. That is deliberate. You should
704 * not leave a pair window with no key, and the zero-height default reminds
705 * you not to. You can use glk_window_set_arrangement() to set a new split
706 * measurement and key window. See <link
707 * linkend="chimara-Changing-Window-Constraints">Changing Window
708 * Constraints</link>.
712 glk_window_close(winid_t win, stream_result_t *result)
714 VALID_WINDOW(win, return);
716 /* If any pair windows have this window or its children as a key window,
717 set their key window to NULL */
718 g_node_traverse(glk_data->root_window, G_IN_ORDER, G_TRAVERSE_NON_LEAVES, -1, (GNodeTraverseFunc)remove_key_windows, win);
720 /* Close all the window streams and destroy the widgets of this window
721 and below, before trashing the window tree */
722 destroy_windows_below(win, result);
724 /* Then free the winid_t structures below this node, but not this one itself */
725 if(win->type == wintype_Pair) {
726 free_winids_below(win->window_node->children->data);
727 free_winids_below(win->window_node->children->next->data);
729 /* So now we should be left with a skeleton tree hanging off this node */
731 /* Parent window changes from a split window into the sibling window */
732 /* The parent of any window is either a pair window or NULL */
733 GNode *pair_node = win->window_node->parent;
734 g_node_destroy(win->window_node);
735 /* If win was not the root window: */
736 if(pair_node != NULL)
738 gboolean new_child_on_left = ( pair_node == g_node_first_sibling(pair_node) );
739 GNode *sibling_node = pair_node->children; /* only one child left */
740 GNode *new_parent_node = pair_node->parent;
741 g_node_unlink(pair_node);
742 g_node_unlink(sibling_node);
743 /* pair_node and sibling_node should now be totally unconnected to the tree */
745 if(new_parent_node == NULL)
747 glk_data->root_window = sibling_node;
751 if(new_child_on_left)
752 g_node_prepend(new_parent_node, sibling_node);
754 g_node_append(new_parent_node, sibling_node);
757 winid_t pair = (winid_t) pair_node->data;
758 g_node_destroy(pair_node);
760 pair->magic = MAGIC_FREE;
763 else /* it was the root window */
765 glk_data->root_window = NULL;
768 win->magic = MAGIC_FREE;
771 /* Schedule a redraw */
773 gtk_widget_queue_resize( GTK_WIDGET(glk_data->self) );
781 * Erases @win. The meaning of this depends on the window type.
784 * <term>Text buffer</term>
786 * This may do any number of things, such as delete all text in the window, or
787 * print enough blank lines to scroll all text beyond visibility, or insert a
788 * page-break marker which is treated specially by the display part of the
793 * <term>Text grid</term>
795 * This will clear the window, filling all positions with blanks. The window
796 * cursor is moved to the top left corner (position 0,0).
800 * <term>Graphics</term>
802 * Clears the entire window to its current background color. See <link
803 * linkend="chimara-Graphics-Windows">Graphics Windows</link>.
807 * <term>Other window types</term>
808 * <listitem><para>No effect.</para></listitem>
812 * It is illegal to erase a window which has line input pending.
815 glk_window_clear(winid_t win)
817 VALID_WINDOW(win, return);
818 g_return_if_fail(win->input_request_type != INPUT_REQUEST_LINE && win->input_request_type != INPUT_REQUEST_LINE_UNICODE);
827 case wintype_TextGrid:
828 /* fill the buffer with blanks */
832 /* Manually put newlines at the end of each row of characters in the buffer; manual newlines make resizing the window's grid easier. */
833 gchar *blanks = g_strnfill(win->width, ' ');
834 gchar **blanklines = g_new0(gchar *, win->height + 1);
836 for(count = 0; count < win->height; count++)
837 blanklines[count] = blanks;
838 blanklines[win->height] = NULL;
839 gchar *text = g_strjoinv("\n", blanklines);
840 g_free(blanklines); /* not g_strfreev() */
843 GtkTextBuffer *textbuffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
844 gtk_text_buffer_set_text(textbuffer, text, -1);
848 gtk_text_buffer_get_start_iter(textbuffer, &begin);
849 gtk_text_buffer_move_mark_by_name(textbuffer, "cursor_position", &begin);
855 case wintype_TextBuffer:
856 /* delete all text in the window */
860 GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
861 GtkTextIter start, end;
862 gtk_text_buffer_get_bounds(buffer, &start, &end);
863 gtk_text_buffer_delete(buffer, &start, &end);
870 ILLEGAL_PARAM("Unknown window type: %d", win->type);
878 * Sets the current stream to @win's window stream. It is exactly equivalent to
879 * <code>#glk_stream_set_current(#glk_window_get_stream(@win))</code>.
882 glk_set_window(winid_t win)
884 VALID_WINDOW_OR_NULL(win, return);
885 glk_stream_set_current( glk_window_get_stream(win) );
889 * glk_window_get_stream:
892 * Returns the stream which is associated with @win. (See <link
893 * linkend="chimara-Window-Streams">Window Streams</link>.) Every window has a
894 * stream which can be printed to, but this may not be useful, depending on the
898 * For example, printing to a blank window's stream has no effect.
901 * Returns: A window stream.
903 strid_t glk_window_get_stream(winid_t win)
905 VALID_WINDOW(win, return NULL);
906 return win->window_stream;
910 * glk_window_set_echo_stream:
912 * @str: A stream to attach to the window, or %NULL.
914 * Sets @win's echo stream to @str, which can be any valid output stream. You
915 * can reset a window to stop echoing by calling
916 * <code>#glk_window_set_echo_stream(@win, %NULL)</code>.
918 * It is illegal to set a window's echo stream to be its
919 * <emphasis>own</emphasis> window stream. That would create an infinite loop,
920 * and is nearly certain to crash the Glk library. It is similarly illegal to
921 * create a longer loop (two or more windows echoing to each other.)
924 glk_window_set_echo_stream(winid_t win, strid_t str)
926 VALID_WINDOW(win, return);
927 VALID_STREAM_OR_NULL(str, return);
929 /* Test for an infinite loop */
931 for(; next && next->type == STREAM_TYPE_WINDOW; next = next->window->echo_stream)
933 if(next == win->window_stream)
935 ILLEGAL("Infinite loop detected");
936 win->echo_stream = NULL;
941 win->echo_stream = str;
945 * glk_window_get_echo_stream:
948 * Returns the echo stream of window @win. Initially, a window has no echo
949 * stream, so <code>#glk_window_get_echo_stream(@win)</code> will return %NULL.
951 * Returns: A stream, or %NULL.
954 glk_window_get_echo_stream(winid_t win)
956 VALID_WINDOW(win, return NULL);
957 return win->echo_stream;
961 * glk_window_get_size:
963 * @widthptr: Pointer to a location to store the window's width, or %NULL.
964 * @heightptr: Pointer to a location to store the window's height, or %NULL.
966 * Simply returns the actual size of the window, in its measurement system.
967 * As described in <link linkend="chimara-Other-API-Conventions">Other API
968 * Conventions</link>, either @widthptr or @heightptr can be %NULL, if you
969 * only want one measurement.
971 * <note><para>Or, in fact, both, if you want to waste time.</para></note>
974 glk_window_get_size(winid_t win, glui32 *widthptr, glui32 *heightptr)
976 VALID_WINDOW(win, return);
984 if(heightptr != NULL)
988 case wintype_TextGrid:
990 /* Wait for the window to be drawn, and then cache the width and height */
991 while(win->widget->allocation.width == 1 && win->widget->allocation.height == 1)
993 /* Release the GDK lock momentarily */
996 while(gtk_events_pending())
997 gtk_main_iteration();
999 win->width = (glui32)(win->widget->allocation.width / win->unit_width);
1000 win->height = (glui32)(win->widget->allocation.height / win->unit_height);
1001 gdk_threads_leave();
1003 if(widthptr != NULL)
1004 *widthptr = win->width;
1005 if(heightptr != NULL)
1006 *heightptr = win->height;
1009 case wintype_TextBuffer:
1010 /* TODO: Glk wants to be able to get its windows' sizes as soon as they are created, but GTK doesn't decide on their sizes until they are drawn. The drawing happens somewhere in an idle function. A good method would be to make an educated guess of the window's size using the ChimaraGlk widget's size. */
1011 gdk_threads_enter();
1012 /*if(win->widget->allocation.width == 1 && win->widget->allocation.height == 1)
1014 g_warning("glk_window_get_size: The Glk program requested the size of a window before it was allocated screen space by GTK. The window size is just an educated guess.");
1015 guess the size from the parent window;
1019 /* Instead, we wait for GTK to draw the widget. This is probably very slow and should be fixed. */
1020 while(win->widget->allocation.width == 1 && win->widget->allocation.height == 1)
1022 /* Release the GDK lock momentarily */
1023 gdk_threads_leave();
1024 gdk_threads_enter();
1025 while(gtk_events_pending())
1026 gtk_main_iteration();
1029 if(widthptr != NULL)
1030 *widthptr = (glui32)(win->widget->allocation.width / win->unit_width);
1031 if(heightptr != NULL)
1032 *heightptr = (glui32)(win->widget->allocation.height / win->unit_height);
1033 gdk_threads_leave();
1038 ILLEGAL_PARAM("Unknown window type: %u", win->type);
1043 * glk_window_move_cursor:
1044 * @win: A text grid window.
1045 * @xpos: Horizontal cursor position.
1046 * @ypos: Vertical cursor position.
1048 * Sets the cursor position. If you move the cursor right past the end of a
1049 * line, it wraps; the next character which is printed will appear at the
1050 * beginning of the next line.
1052 * If you move the cursor below the last line, or when the cursor reaches the
1053 * end of the last line, it goes <quote>off the screen</quote> and further
1054 * output has no effect. You must call glk_window_move_cursor() or
1055 * glk_window_clear() to move the cursor back into the visible region.
1058 * Note that the arguments of glk_window_move_cursor() are <type>unsigned
1059 * int</type>s. This is okay, since there are no negative positions. If you try
1060 * to pass a negative value, Glk will interpret it as a huge positive value,
1061 * and it will wrap or go off the last line.
1065 * Also note that the output cursor is not necessarily visible. In particular,
1066 * when you are requesting line or character input in a grid window, you cannot
1067 * rely on the cursor position to prompt the player where input is indicated.
1068 * You should print some character prompt at that spot — a
1069 * <quote>></quote> character, for example.
1073 glk_window_move_cursor(winid_t win, glui32 xpos, glui32 ypos)
1075 VALID_WINDOW(win, return);
1076 g_return_if_fail(win->type == wintype_TextGrid);
1078 /* Calculate actual position if cursor is moved past the right edge */
1079 if(xpos >= win->width)
1081 ypos += xpos / win->width;
1084 /* Go to the end if the cursor is moved off the bottom edge */
1085 if(ypos >= win->height)
1087 xpos = win->width - 1;
1088 ypos = win->height - 1;
1091 gdk_threads_enter();
1093 GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
1095 /* There must actually be a character at xpos, or the following function will choke */
1096 gtk_text_buffer_get_iter_at_line_offset(buffer, &newpos, ypos, xpos);
1097 gtk_text_buffer_move_mark_by_name(buffer, "cursor_position", &newpos);
1099 gdk_threads_leave();