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 * |[ newwin = #glk_window_open(win, #winmethod_Above | #winmethod_Proportional, 40, #wintype_TextBuffer, 0); ]|
216 * To create a text grid which is always five lines high, at the bottom of the
217 * original window, you would do
218 * |[ newwin = #glk_window_open(win, #winmethod_Below | #winmethod_Fixed, 5, #wintype_TextGrid, 0); ]|
220 * Note that the meaning of the @size argument depends on the @method argument.
221 * If the method is %winmethod_Fixed, it also depends on the @wintype argument.
222 * The new window is then called the <quote>key window</quote> of this split,
223 * because its window type determines how the split size is computed.
226 * For %winmethod_Proportional splits, you can still call the new window the
227 * <quote>key window</quote>. But the key window is not important for
228 * proportional splits, because the size will always be computed as a simple
229 * ratio of the available space, not a fixed size of one child window.
232 * This system is more or less peachy as long as all the constraints work out.
233 * What happens when there is a conflict? The rules are simple. Size control
234 * always flows down the tree, and the player is at the top. Let's bring out an
236 * <informaltable frame="none"><tgroup cols="2"><tbody><row>
237 * <entry><mediaobject><imageobject><imagedata fileref="fig5-7a.png"/>
238 * </imageobject></mediaobject></entry>
239 * <entry><mediaobject><textobject><literallayout class="monospaced">
245 * </literallayout></textobject></mediaobject></entry>
246 * </row></tbody></tgroup></informaltable>
248 * First we split A into A and B, with a 50% proportional split. Then we split
249 * A into A and C, with C above, C being a text grid window, and C gets a fixed
250 * size of two rows (as measured in its own font size). A gets whatever remains
251 * of the 50% it had before.
253 * Now the player stretches the window vertically.
254 * <informalfigure><mediaobject><imageobject><imagedata fileref="fig6.png"/>
255 * </imageobject></mediaobject></informalfigure>
257 * The library figures: the topmost split, the original A/B split, is 50-50. So
258 * B gets half the screen space, and the pair window next to it (the lower
259 * <quote>O</quote>) gets the other half. Then it looks at the lower
260 * <quote>O</quote>. C gets two rows; A gets the rest. All done.
262 * Then the user maliciously starts squeezing the window down, in stages:
263 * <informaltable frame="none"><tgroup cols="5"><tbody><row valign="top">
264 * <entry><mediaobject><imageobject><imagedata fileref="fig5-7a.png"/>
265 * </imageobject></mediaobject></entry>
266 * <entry><mediaobject><imageobject><imagedata fileref="fig7b.png"/>
267 * </imageobject></mediaobject></entry>
268 * <entry><mediaobject><imageobject><imagedata fileref="fig7c.png"/>
269 * </imageobject></mediaobject></entry>
270 * <entry><mediaobject><imageobject><imagedata fileref="fig7d.png"/>
271 * </imageobject></mediaobject></entry>
272 * <entry><mediaobject><imageobject><imagedata fileref="fig7e.png"/>
273 * </imageobject></mediaobject></entry>
274 * </row></tbody></tgroup></informaltable>
276 * The logic remains the same. B always gets half the space. At stage 3,
277 * there's no room left for A, so it winds up with zero height. Nothing
278 * displayed in A will be visible. At stage 4, there isn't even room in the
279 * upper 50% to give C its two rows; so it only gets one. Finally, C is
280 * squashed out of existence as well.
282 * When a window winds up undersized, it remembers what size it should be. In
283 * the example above, A remembers that it should be two rows; if the user
284 * expands the window to the original size, it would return to the original
287 * The downward flow of control is a bit harsh. After all, in stage 4, there's
288 * room for C to have its two rows if only B would give up some of its 50%. But
289 * this does not happen.
292 * This makes life much easier for the Glk library. To determine the
293 * configuration of a window, it only needs to look at the window's
294 * ancestors, never at its descendants. So window layout is a simple
295 * recursive algorithm, no backtracking.
298 * What happens when you split a fixed-size window? The resulting pair window
299 * — that is, the two new parts together — retain the same size
300 * constraint as the original window that was split. The key window for the
301 * original split is still the key window for that split, even though it's now
302 * a grandchild instead of a child.
304 * The easy, and correct, way to think about this is that the size constraint
305 * is stored by a window's parent, not the window itself; and a constraint
306 * consists of a pointer to a key window plus a size value.
308 * <informaltable frame="none"><tgroup cols="6"><tbody><row>
309 * <entry><mediaobject><imageobject><imagedata fileref="fig8a.png"/>
310 * </imageobject></mediaobject></entry>
311 * <entry><mediaobject><textobject><literallayout class="monospaced">
313 * </literallayout></textobject></mediaobject></entry>
314 * <entry><mediaobject><imageobject><imagedata fileref="fig8b.png"/>
315 * </imageobject></mediaobject></entry>
316 * <entry><mediaobject><textobject><literallayout class="monospaced">
320 * </literallayout></textobject></mediaobject></entry>
321 * <entry><mediaobject><imageobject><imagedata fileref="fig8c.png"/>
322 * </imageobject></mediaobject></entry>
323 * <entry><mediaobject><textobject><literallayout class="monospaced">
329 * </literallayout></textobject></mediaobject></entry>
330 * </row></tbody></tgroup></informaltable>
331 * After the first split, the new pair window (O1, which covers the whole
332 * screen) knows that its first child (A) is above the second, and gets 50% of
333 * its own area. (A is the key window for this split, but a proportional split
334 * doesn't care about key windows.)
336 * After the second split, all this remains true; O1 knows that its first child
337 * gets 50% of its space, and A is O1's key window. But now O1's first child is
338 * O2 instead of A. The newer pair window (O2) knows that its first child (C)
339 * is above the second, and gets a fixed size of two rows. (As measured in C's
340 * font, because C is O2's key window.)
342 * If we split C, now, the resulting pair will still be two C-font rows high
343 * — that is, tall enough for two lines of whatever font C displays. For
344 * the sake of example, we'll do this vertically.
345 * <informaltable frame="none"><tgroup cols="2"><tbody><row>
346 * <entry><mediaobject><imageobject><imagedata fileref="fig9.png"/>
347 * </imageobject></mediaobject></entry>
348 * <entry><mediaobject><textobject><literallayout class="monospaced">
356 * </literallayout></textobject></mediaobject></entry>
357 * </row></tbody></tgroup></informaltable>
359 * O3 now knows that its children have a 50-50 left-right split. O2 is still
360 * committed to giving its upper child, O3, two C-font rows. Again, this is
361 * because C is O2's key window.
364 * This turns out to be a good idea, because it means that C, the text grid
365 * window, is still two rows high. If O3 had been a upper-lower split, things
366 * wouldn't work out so neatly. But the rules would still apply. If you don't
367 * like this, don't do it.
370 * Returns: the new window, or %NULL on error.
373 glk_window_open(winid_t split, glui32 method, glui32 size, glui32 wintype,
376 VALID_WINDOW_OR_NULL(split, return NULL);
377 g_return_val_if_fail(method == (method & (winmethod_DirMask | winmethod_DivisionMask)), NULL);
378 g_return_val_if_fail(!(((method & winmethod_DivisionMask) == winmethod_Proportional) && size > 100), NULL);
380 if(split == NULL && glk_data->root_window != NULL)
382 ILLEGAL("Tried to open a new root window, but there is already a root window");
388 /* Create the new window */
389 winid_t win = g_new0(struct glk_window_struct, 1);
390 win->magic = MAGIC_WINDOW;
393 win->window_node = g_node_new(win);
399 /* A blank window will be a label without any text */
400 GtkWidget *label = gtk_label_new("");
401 gtk_widget_show(label);
405 /* A blank window has no size */
407 win->unit_height = 0;
408 /* You can print to a blank window's stream, but it does nothing */
409 win->window_stream = window_stream_new(win);
410 win->echo_stream = NULL;
414 case wintype_TextGrid:
416 GtkWidget *textview = gtk_text_view_new();
418 gtk_text_view_set_wrap_mode( GTK_TEXT_VIEW(textview), GTK_WRAP_NONE );
419 gtk_text_view_set_editable( GTK_TEXT_VIEW(textview), FALSE );
420 gtk_widget_show(textview);
422 /* Set the window's font */
423 gtk_widget_modify_font(textview, glk_data->monospace_font_desc);
425 win->widget = textview;
426 win->frame = textview;
428 /* Determine the size of a "0" character in pixels */
429 PangoLayout *zero = gtk_widget_create_pango_layout(textview, "0");
430 pango_layout_set_font_description(zero, glk_data->monospace_font_desc);
431 pango_layout_get_pixel_size(zero, &(win->unit_width), &(win->unit_height));
432 g_object_unref(zero);
434 /* Set the other parameters (width and height are set later) */
435 win->window_stream = window_stream_new(win);
436 win->echo_stream = NULL;
437 win->input_request_type = INPUT_REQUEST_NONE;
438 win->line_input_buffer = NULL;
439 win->line_input_buffer_unicode = NULL;
441 /* Connect signal handlers */
442 win->keypress_handler = g_signal_connect( G_OBJECT(textview), "key-press-event", G_CALLBACK(on_window_key_press_event), win );
443 g_signal_handler_block( G_OBJECT(textview), win->keypress_handler );
447 case wintype_TextBuffer:
449 GtkWidget *scrolledwindow = gtk_scrolled_window_new(NULL, NULL);
450 GtkWidget *textview = gtk_text_view_new();
451 GtkTextBuffer *textbuffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(textview) );
453 gtk_scrolled_window_set_policy( GTK_SCROLLED_WINDOW(scrolledwindow), GTK_POLICY_NEVER, GTK_POLICY_AUTOMATIC );
455 gtk_text_view_set_wrap_mode( GTK_TEXT_VIEW(textview), GTK_WRAP_WORD_CHAR );
456 gtk_text_view_set_editable( GTK_TEXT_VIEW(textview), FALSE );
457 gtk_text_view_set_pixels_inside_wrap( GTK_TEXT_VIEW(textview), 3 );
458 gtk_text_view_set_left_margin( GTK_TEXT_VIEW(textview), 20 );
459 gtk_text_view_set_right_margin( GTK_TEXT_VIEW(textview), 20 );
461 gtk_container_add( GTK_CONTAINER(scrolledwindow), textview );
462 gtk_widget_show_all(scrolledwindow);
464 /* Set the window's font */
465 gtk_widget_modify_font(textview, glk_data->default_font_desc);
467 win->widget = textview;
468 win->frame = scrolledwindow;
470 /* Determine the size of a "0" character in pixels */
471 PangoLayout *zero = gtk_widget_create_pango_layout(textview, "0");
472 pango_layout_set_font_description(zero, glk_data->default_font_desc);
473 pango_layout_get_pixel_size(zero, &(win->unit_width), &(win->unit_height));
474 g_object_unref(zero);
476 /* Set the other parameters */
477 win->window_stream = window_stream_new(win);
478 win->echo_stream = NULL;
479 win->input_request_type = INPUT_REQUEST_NONE;
480 win->line_input_buffer = NULL;
481 win->line_input_buffer_unicode = NULL;
483 /* Connect signal handlers */
484 win->keypress_handler = g_signal_connect( G_OBJECT(textview), "key-press-event", G_CALLBACK(on_window_key_press_event), win );
485 g_signal_handler_block( G_OBJECT(textview), win->keypress_handler );
487 win->insert_text_handler = g_signal_connect_after( G_OBJECT(textbuffer), "insert-text", G_CALLBACK(after_window_insert_text), win );
488 g_signal_handler_block( G_OBJECT(textbuffer), win->insert_text_handler );
490 /* Create an editable tag to indicate uneditable parts of the window
492 gtk_text_buffer_create_tag(textbuffer, "uneditable", "editable", FALSE, "editable-set", TRUE, NULL);
494 /* Create the default styles available to the window stream */
495 style_init_textbuffer(textbuffer);
497 /* Mark the position where the user will input text */
499 gtk_text_buffer_get_end_iter(textbuffer, &end);
500 gtk_text_buffer_create_mark(textbuffer, "input_position", &end, TRUE);
506 ILLEGAL_PARAM("Unknown window type: %u", wintype);
508 g_node_destroy(glk_data->root_window);
509 glk_data->root_window = NULL;
513 /* Set the minimum size to "as small as possible" so it doesn't depend on
514 the size of the window contents */
515 gtk_widget_set_size_request(win->widget, 0, 0);
516 gtk_widget_set_size_request(win->frame, 0, 0);
520 /* When splitting, construct a new parent window
521 * copying most characteristics from the window that is being split */
522 winid_t pair = g_new0(struct glk_window_struct, 1);
523 pair->magic = MAGIC_WINDOW;
525 pair->type = wintype_Pair;
526 pair->window_node = g_node_new(pair);
527 /* You can print to a pair window's window stream, but it has no effect */
528 pair->window_stream = window_stream_new(pair);
529 pair->echo_stream = NULL;
531 /* The pair window must know about its children's split method */
532 pair->key_window = win;
533 pair->split_method = method;
534 pair->constraint_size = size;
536 /* Insert the new window into the window tree */
537 if(split->window_node->parent == NULL)
538 glk_data->root_window = pair->window_node;
541 if( split->window_node == g_node_first_sibling(split->window_node) )
542 g_node_prepend(split->window_node->parent, pair->window_node);
544 g_node_append(split->window_node->parent, pair->window_node);
545 g_node_unlink(split->window_node);
547 /* Place the windows in the correct order */
548 switch(method & winmethod_DirMask)
551 case winmethod_Above:
552 g_node_append(pair->window_node, win->window_node);
553 g_node_append(pair->window_node, split->window_node);
555 case winmethod_Right:
556 case winmethod_Below:
557 g_node_append(pair->window_node, split->window_node);
558 g_node_append(pair->window_node, win->window_node);
563 /* Set the window as root window */
564 glk_data->root_window = win->window_node;
567 /* Set the window as a child of the Glk widget, don't trigger an arrange event */
568 g_mutex_lock(glk_data->arrange_lock);
569 glk_data->needs_rearrange = TRUE;
570 glk_data->ignore_next_arrange_event = TRUE;
571 g_mutex_unlock(glk_data->arrange_lock);
572 gtk_widget_set_parent(win->frame, GTK_WIDGET(glk_data->self));
573 gtk_widget_queue_resize(GTK_WIDGET(glk_data->self));
575 /* For text grid windows, fill the buffer with blanks. */
576 if(wintype == wintype_TextGrid)
578 /* Create the cursor position mark */
580 GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
581 gtk_text_buffer_get_start_iter(buffer, &begin);
582 gtk_text_buffer_create_mark(buffer, "cursor_position", &begin, TRUE);
586 glk_window_clear(win);
590 /* Internal function: if node's key window is closing_win or one of its
591 children, set node's key window to NULL. */
593 remove_key_windows(GNode *node, winid_t closing_win)
595 winid_t win = (winid_t)node->data;
596 if(win->key_window && (win->key_window == closing_win || g_node_is_ancestor(closing_win->window_node, win->key_window->window_node)))
597 win->key_window = NULL;
598 return FALSE; /* Don't stop the traversal */
601 /* Internal function: destroy this window's GTK widgets, window streams,
602 and those of all its children. GDK threads must be locked. */
604 destroy_windows_below(winid_t win, stream_result_t *result)
609 case wintype_TextGrid:
610 case wintype_TextBuffer:
611 gtk_widget_unparent(win->frame);
615 destroy_windows_below(win->window_node->children->data, NULL);
616 destroy_windows_below(win->window_node->children->next->data, NULL);
620 ILLEGAL_PARAM("Unknown window type: %u", win->type);
623 stream_close_common(win->window_stream, result);
626 /* Internal function: free the winid_t structure of this window and those of all its children */
628 free_winids_below(winid_t win)
630 if(win->type == wintype_Pair) {
631 free_winids_below(win->window_node->children->data);
632 free_winids_below(win->window_node->children->next->data);
634 win->magic = MAGIC_FREE;
640 * @win: Window to close.
641 * @result: Pointer to a #stream_result_t in which to store the write count.
643 * Closes @win, which is pretty much exactly the opposite of opening a window.
644 * It is legal to close all your windows, or to close the root window (which is
647 * The @result argument is filled with the output character count of the window
648 * stream. See <link linkend="chimara-Streams">Streams</link> and <link
649 * linkend="chimara-Closing-Streams">Closing Streams</link>.
651 * When you close a window (and it is not the root window), the other window
652 * in its pair takes over all the freed-up area. Let's close D, in the current
654 * <informaltable frame="none"><tgroup cols="2"><tbody><row>
655 * <entry><mediaobject><imageobject><imagedata fileref="fig10.png"/>
656 * </imageobject></mediaobject></entry>
657 * <entry><mediaobject><textobject><literallayout class="monospaced">
663 * </literallayout></textobject></mediaobject></entry>
664 * </row></tbody></tgroup></informaltable>
666 * Notice what has happened. D is gone. O3 is gone, and its 50-50 left-right
667 * split has gone with it. The other size constraints are unchanged; O2 is
668 * still committed to giving its upper child two rows, as measured in the font
669 * of O2's key window, which is C. Conveniently, O2's upper child is C, just as
670 * it was before we created D. In fact, now that D is gone, everything is back
671 * to the way it was before we created D.
673 * But what if we had closed C instead of D? We would have gotten this:
674 * <informaltable frame="none"><tgroup cols="2"><tbody><row>
675 * <entry><mediaobject><imageobject><imagedata fileref="fig11.png"/>
676 * </imageobject></mediaobject></entry>
677 * <entry><mediaobject><textobject><literallayout class="monospaced">
683 * </literallayout></textobject></mediaobject></entry>
684 * </row></tbody></tgroup></informaltable>
686 * Again, O3 is gone. But D has collapsed to zero height. This is because its
687 * height is controlled by O2, and O2's key window was C, and C is now gone. O2
688 * no longer has a key window at all, so it cannot compute a height for its
689 * upper child, so it defaults to zero.
692 * This may seem to be an inconvenient choice. That is deliberate. You should
693 * not leave a pair window with no key, and the zero-height default reminds
694 * you not to. You can use glk_window_set_arrangement() to set a new split
695 * measurement and key window. See <link
696 * linkend="chimara-Changing-Window-Constraints">Changing Window
697 * Constraints</link>.
701 glk_window_close(winid_t win, stream_result_t *result)
703 VALID_WINDOW(win, return);
705 gdk_threads_enter(); /* Prevent redraw while we're trashing the window */
707 /* If any pair windows have this window or its children as a key window,
708 set their key window to NULL */
709 g_node_traverse(glk_data->root_window, G_IN_ORDER, G_TRAVERSE_NON_LEAVES, -1, (GNodeTraverseFunc)remove_key_windows, win);
711 /* Close all the window streams and destroy the widgets of this window
712 and below, before trashing the window tree */
713 destroy_windows_below(win, result);
715 /* Then free the winid_t structures below this node, but not this one itself */
716 if(win->type == wintype_Pair) {
717 free_winids_below(win->window_node->children->data);
718 free_winids_below(win->window_node->children->next->data);
720 /* So now we should be left with a skeleton tree hanging off this node */
722 /* Parent window changes from a split window into the sibling window */
723 /* The parent of any window is either a pair window or NULL */
724 GNode *pair_node = win->window_node->parent;
725 g_node_destroy(win->window_node);
726 /* If win was not the root window: */
727 if(pair_node != NULL)
729 gboolean new_child_on_left = ( pair_node == g_node_first_sibling(pair_node) );
730 GNode *sibling_node = pair_node->children; /* only one child left */
731 GNode *new_parent_node = pair_node->parent;
732 g_node_unlink(pair_node);
733 g_node_unlink(sibling_node);
734 /* pair_node and sibling_node should now be totally unconnected to the tree */
736 if(new_parent_node == NULL)
738 glk_data->root_window = sibling_node;
742 if(new_child_on_left)
743 g_node_prepend(new_parent_node, sibling_node);
745 g_node_append(new_parent_node, sibling_node);
748 winid_t pair = (winid_t) pair_node->data;
749 g_node_destroy(pair_node);
751 pair->magic = MAGIC_FREE;
754 else /* it was the root window */
756 glk_data->root_window = NULL;
759 win->magic = MAGIC_FREE;
762 /* Schedule a redraw */
763 g_mutex_lock(glk_data->arrange_lock);
764 glk_data->needs_rearrange = TRUE;
765 glk_data->ignore_next_arrange_event = TRUE;
766 g_mutex_unlock(glk_data->arrange_lock);
767 gtk_widget_queue_resize( GTK_WIDGET(glk_data->self) );
775 * Erases @win. The meaning of this depends on the window type.
778 * <term>Text buffer</term>
780 * This may do any number of things, such as delete all text in the window, or
781 * print enough blank lines to scroll all text beyond visibility, or insert a
782 * page-break marker which is treated specially by the display part of the
787 * <term>Text grid</term>
789 * This will clear the window, filling all positions with blanks. The window
790 * cursor is moved to the top left corner (position 0,0).
794 * <term>Graphics</term>
796 * Clears the entire window to its current background color. See <link
797 * linkend="chimara-Graphics-Windows">Graphics Windows</link>.
801 * <term>Other window types</term>
802 * <listitem><para>No effect.</para></listitem>
806 * It is illegal to erase a window which has line input pending.
809 glk_window_clear(winid_t win)
811 VALID_WINDOW(win, return);
812 g_return_if_fail(win->input_request_type != INPUT_REQUEST_LINE && win->input_request_type != INPUT_REQUEST_LINE_UNICODE);
821 case wintype_TextGrid:
822 /* fill the buffer with blanks */
824 /* Wait for the window's size to be updated */
825 g_mutex_lock(glk_data->arrange_lock);
826 if(glk_data->needs_rearrange)
827 g_cond_wait(glk_data->rearranged, glk_data->arrange_lock);
828 g_mutex_unlock(glk_data->arrange_lock);
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 * |[ #glk_stream_set_current(#glk_window_get_stream(@win)) ]|
880 * See <link linkend="chimara-Streams">Streams</link>.
883 glk_set_window(winid_t win)
885 VALID_WINDOW(win, return);
886 glk_stream_set_current( glk_window_get_stream(win) );
890 * glk_window_get_stream:
893 * Returns the stream which is associated with @win. (See <link
894 * linkend="chimara-Window-Streams">Window Streams</link>.) Every window has a
895 * stream which can be printed to, but this may not be useful, depending on the
899 * For example, printing to a blank window's stream has no effect.
902 * Returns: A window stream.
904 strid_t glk_window_get_stream(winid_t win)
906 VALID_WINDOW(win, return NULL);
907 return win->window_stream;
911 * glk_window_set_echo_stream:
913 * @str: A stream to attach to the window, or %NULL.
915 * Sets @win's echo stream to @str, which can be any valid output stream. You
916 * can reset a window to stop echoing by calling
917 * <code>#glk_window_set_echo_stream(@win, %NULL)</code>.
919 * It is illegal to set a window's echo stream to be its
920 * <emphasis>own</emphasis> window stream. That would create an infinite loop,
921 * and is nearly certain to crash the Glk library. It is similarly illegal to
922 * create a longer loop (two or more windows echoing to each other.)
925 glk_window_set_echo_stream(winid_t win, strid_t str)
927 VALID_WINDOW(win, return);
928 VALID_STREAM_OR_NULL(str, return);
930 /* Test for an infinite loop */
932 for(; next && next->type == STREAM_TYPE_WINDOW; next = next->window->echo_stream)
934 if(next == win->window_stream)
936 ILLEGAL("Infinite loop detected");
937 win->echo_stream = NULL;
942 win->echo_stream = str;
946 * glk_window_get_echo_stream:
949 * Returns the echo stream of window @win. Initially, a window has no echo
950 * stream, so <code>#glk_window_get_echo_stream(@win)</code> will return %NULL.
952 * Returns: A stream, or %NULL.
955 glk_window_get_echo_stream(winid_t win)
957 VALID_WINDOW(win, return NULL);
958 return win->echo_stream;
962 * glk_window_get_size:
964 * @widthptr: Pointer to a location to store the window's width, or %NULL.
965 * @heightptr: Pointer to a location to store the window's height, or %NULL.
967 * Simply returns the actual size of the window, in its measurement system.
968 * As described in <link linkend="chimara-Other-API-Conventions">Other API
969 * Conventions</link>, either @widthptr or @heightptr can be %NULL, if you
970 * only want one measurement.
972 * <note><para>Or, in fact, both, if you want to waste time.</para></note>
975 glk_window_get_size(winid_t win, glui32 *widthptr, glui32 *heightptr)
977 VALID_WINDOW(win, return);
985 if(heightptr != NULL)
989 case wintype_TextGrid:
990 /* Wait until the window's size is current */
991 g_mutex_lock(glk_data->arrange_lock);
992 if(glk_data->needs_rearrange)
993 g_cond_wait(glk_data->rearranged, glk_data->arrange_lock);
994 g_mutex_unlock(glk_data->arrange_lock);
997 /* Cache the width and height */
998 win->width = (glui32)(win->widget->allocation.width / win->unit_width);
999 win->height = (glui32)(win->widget->allocation.height / win->unit_height);
1000 gdk_threads_leave();
1002 if(widthptr != NULL)
1003 *widthptr = win->width;
1004 if(heightptr != NULL)
1005 *heightptr = win->height;
1008 case wintype_TextBuffer:
1009 /* Wait until the window's size is current */
1010 g_mutex_lock(glk_data->arrange_lock);
1011 if(glk_data->needs_rearrange)
1012 g_cond_wait(glk_data->rearranged, glk_data->arrange_lock);
1013 g_mutex_unlock(glk_data->arrange_lock);
1015 gdk_threads_enter();
1016 if(widthptr != NULL)
1017 *widthptr = (glui32)(win->widget->allocation.width / win->unit_width);
1018 if(heightptr != NULL)
1019 *heightptr = (glui32)(win->widget->allocation.height / win->unit_height);
1020 gdk_threads_leave();
1025 ILLEGAL_PARAM("Unknown window type: %u", win->type);
1030 * glk_window_set_arrangement:
1031 * @win: a pair window to rearrange.
1032 * @method: new method of size computation. One of %winmethod_Above,
1033 * %winmethod_Below, %winmethod_Left, or %winmethod_Right OR'ed with
1034 * %winmethod_Fixed or %winmethod_Proportional.
1035 * @size: new size constraint, in percentage points if @method is
1036 * %winmethod_Proportional, otherwise in characters if @win's type is
1037 * %wintype_TextBuffer or %wintype_TextGrid, or pixels if @win's type is
1038 * %wintype_Graphics.
1039 * @keywin: new key window, or %NULL to leave the key window unchanged.
1041 * Changes the size of an existing split — that is, it changes the
1042 * constraint of a given pair window.
1044 * Consider the example above, where D has collapsed to zero height. Say D was a
1045 * text buffer window. You could make a more useful layout by doing
1048 * o2 = #glk_window_get_parent(d);
1049 * glk_window_set_arrangement(o2, #winmethod_Above | #winmethod_Fixed, 3, d);
1051 * That would set D (the upper child of O2) to be O2's key window, and give it a
1052 * fixed size of 3 rows.
1054 * If you later wanted to expand D, you could do
1055 * |[ glk_window_set_arrangement(o2, #winmethod_Above | #winmethod_Fixed, 5, NULL); ]|
1056 * That expands D to five rows. Note that, since O2's key window is already set
1057 * to D, it is not necessary to provide the @keywin argument; you can pass %NULL
1058 * to mean <quote>leave the key window unchanged.</quote>
1060 * If you do change the key window of a pair window, the new key window
1061 * <emphasis>must</emphasis> be a descendant of that pair window. In the current
1062 * example, you could change O2's key window to be A, but not B. The key window
1063 * also cannot be a pair window itself.
1065 * |[ glk_window_set_arrangement(o2, #winmethod_Below | #winmethod_Fixed, 3, NULL); ]|
1066 * This changes the constraint to be on the <emphasis>lower</emphasis> child of
1067 * O2, which is A. The key window is still D; so A would then be three rows high
1068 * as measured in D's font, and D would get the rest of O2's space. That may not
1069 * be what you want. To set A to be three rows high as measured in A's font, you
1071 * |[ glk_window_set_arrangement(o2, #winmethod_Below | #winmethod_Fixed, 3, a); ]|
1073 * Or you could change O2 to a proportional split:
1074 * |[ glk_window_set_arrangement(o2, #winmethod_Below | #winmethod_Proportional, 30, NULL); ]|
1076 * |[ glk_window_set_arrangement(o2, #winmethod_Above | #winmethod_Proportional, 70, NULL); ]|
1077 * These do exactly the same thing, since 30% above is the same as
1078 * 70% below. You don't need to specify a key window with a proportional
1079 * split, so the @keywin argument is %NULL. (You could actually specify either A
1080 * or D as the key window, but it wouldn't affect the result.)
1082 * Whatever constraint you set, glk_window_get_size() will tell you the actual
1083 * window size you got.
1085 * Note that you can resize windows, but you can't flip or rotate them. You
1086 * can't move A above D, or change O2 to a vertical split where A is left or
1089 * To get this effect you could close one of the windows, and re-split the
1090 * other one with glk_window_open().
1094 glk_window_set_arrangement(winid_t win, glui32 method, glui32 size, winid_t keywin)
1096 VALID_WINDOW(win, return);
1097 VALID_WINDOW_OR_NULL(keywin, return);
1098 g_return_if_fail(win->type == wintype_Pair);
1101 g_return_if_fail(keywin->type != wintype_Pair);
1102 g_return_if_fail(g_node_is_ancestor(win->window_node, keywin->window_node));
1104 g_return_if_fail(method == (method & (winmethod_DirMask | winmethod_DivisionMask)));
1105 g_return_if_fail(!(((method & winmethod_DivisionMask) == winmethod_Proportional) && size > 100));
1107 win->split_method = method;
1108 win->constraint_size = size;
1110 win->key_window = keywin;
1112 /* Tell GTK to rearrange the windows */
1113 gdk_threads_enter();
1114 g_mutex_lock(glk_data->arrange_lock);
1115 glk_data->needs_rearrange = TRUE;
1116 glk_data->ignore_next_arrange_event = TRUE;
1117 g_mutex_unlock(glk_data->arrange_lock);
1118 gtk_widget_queue_resize(GTK_WIDGET(glk_data->self));
1119 gdk_threads_leave();
1123 * glk_window_get_arrangement:
1124 * @win: a pair window.
1125 * @methodptr: return location for the constraint flags of @win, or %NULL.
1126 * @sizeptr: return location for the constraint size of @win, or %NULL.
1127 * @keywinptr: return location for the key window of @win, or %NULL.
1129 * Queries the constraint of a given pair window.
1132 glk_window_get_arrangement(winid_t win, glui32 *methodptr, glui32 *sizeptr, winid_t *keywinptr)
1134 VALID_WINDOW(win, return);
1135 g_return_if_fail(win->type == wintype_Pair);
1138 *methodptr = win->split_method;
1140 *sizeptr = win->constraint_size;
1142 *keywinptr = win->key_window;
1146 * glk_window_move_cursor:
1147 * @win: A text grid window.
1148 * @xpos: Horizontal cursor position.
1149 * @ypos: Vertical cursor position.
1151 * Sets the cursor position. If you move the cursor right past the end of a
1152 * line, it wraps; the next character which is printed will appear at the
1153 * beginning of the next line.
1155 * If you move the cursor below the last line, or when the cursor reaches the
1156 * end of the last line, it goes <quote>off the screen</quote> and further
1157 * output has no effect. You must call glk_window_move_cursor() or
1158 * glk_window_clear() to move the cursor back into the visible region.
1161 * Note that the arguments of glk_window_move_cursor() are <type>unsigned
1162 * int</type>s. This is okay, since there are no negative positions. If you try
1163 * to pass a negative value, Glk will interpret it as a huge positive value,
1164 * and it will wrap or go off the last line.
1168 * Also note that the output cursor is not necessarily visible. In particular,
1169 * when you are requesting line or character input in a grid window, you cannot
1170 * rely on the cursor position to prompt the player where input is indicated.
1171 * You should print some character prompt at that spot — a
1172 * <quote>></quote> character, for example.
1176 glk_window_move_cursor(winid_t win, glui32 xpos, glui32 ypos)
1178 VALID_WINDOW(win, return);
1179 g_return_if_fail(win->type == wintype_TextGrid);
1181 /* Wait until the window's size is current */
1182 g_mutex_lock(glk_data->arrange_lock);
1183 if(glk_data->needs_rearrange)
1184 g_cond_wait(glk_data->rearranged, glk_data->arrange_lock);
1185 g_mutex_unlock(glk_data->arrange_lock);
1187 /* Don't do anything if the window is shrunk down to nothing */
1188 if(win->width == 0 || win->height == 0)
1191 /* Calculate actual position if cursor is moved past the right edge */
1192 if(xpos >= win->width)
1194 ypos += xpos / win->width;
1197 /* Go to the end if the cursor is moved off the bottom edge */
1198 if(ypos >= win->height)
1200 xpos = win->width - 1;
1201 ypos = win->height - 1;
1204 gdk_threads_enter();
1206 GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
1208 /* There must actually be a character at xpos, or the following function will choke */
1209 gtk_text_buffer_get_iter_at_line_offset(buffer, &newpos, ypos, xpos);
1210 gtk_text_buffer_move_mark_by_name(buffer, "cursor_position", &newpos);
1212 gdk_threads_leave();