1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>GwyNullStore: Gwyddion Widgets Library Reference Manual</title>
<meta name="generator" content="DocBook XSL Stylesheets Vsnapshot">
<link rel="home" href="index.html" title="Gwyddion Widgets Library Reference Manual">
<link rel="up" href="GeneralWidgets.html" title="General Widgets">
<link rel="prev" href="GwyInventoryStore.html" title="GwyInventoryStore">
<link rel="next" href="WidgetUtilities.html" title="Widget Utilities">
<meta name="generator" content="GTK-Doc V1.19 (XML mode)">
<link rel="stylesheet" href="style.css" type="text/css">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle">
<td width="100%" align="left" class="shortcuts">
<a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span>
<a href="#GwyNullStore.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span>
<a href="#GwyNullStore.object-hierarchy" class="shortcut">Object Hierarchy</a></span><span id="nav_interfaces"> <span class="dim">|</span>
<a href="#GwyNullStore.implemented-interfaces" class="shortcut">Implemented Interfaces</a></span>
</td>
<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
<td><a accesskey="u" href="GeneralWidgets.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td>
<td><a accesskey="p" href="GwyInventoryStore.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td>
<td><a accesskey="n" href="WidgetUtilities.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td>
</tr></table>
<div class="refentry">
<a name="GwyNullStore"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="GwyNullStore.top_of_page"></a>GwyNullStore</span></h2>
<p>GwyNullStore — GtkTreeModel wrapper around nothing</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="GwyNullStore.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_proto_type">
<col class="functions_proto_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="returnvalue">GwyNullStore</span></a> *
</td>
<td class="function_name">
<a class="link" href="GwyNullStore.html#gwy-null-store-new" title="gwy_null_store_new ()">gwy_null_store_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
</td>
<td class="function_name">
<a class="link" href="GwyNullStore.html#gwy-null-store-get-n-rows" title="gwy_null_store_get_n_rows ()">gwy_null_store_get_n_rows</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GwyNullStore.html#gwy-null-store-set-n-rows" title="gwy_null_store_set_n_rows ()">gwy_null_store_set_n_rows</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gpointer"><span class="returnvalue">gpointer</span></a>
</td>
<td class="function_name">
<a class="link" href="GwyNullStore.html#gwy-null-store-get-model" title="gwy_null_store_get_model ()">gwy_null_store_get_model</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GwyNullStore.html#gwy-null-store-set-model" title="gwy_null_store_set_model ()">gwy_null_store_set_model</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GwyNullStore.html#gwy-null-store-row-changed" title="gwy_null_store_row_changed ()">gwy_null_store_row_changed</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GwyNullStore.html#gwy-null-store-rows-changed" title="gwy_null_store_rows_changed ()">gwy_null_store_rows_changed</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GwyNullStore.html#gwy-null-store-iter-is-valid" title="gwy_null_store_iter_is_valid ()">gwy_null_store_iter_is_valid</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GwyNullStore.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="other_proto_type">
<col class="other_proto_name">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GwyNullStore.html#GwyNullStore-struct" title="struct GwyNullStore">GwyNullStore</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GwyNullStore.html#GwyNullStoreClass" title="struct GwyNullStoreClass">GwyNullStoreClass</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GwyNullStore.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> <a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject</a>
<span class="lineart">╰──</span> GwyNullStore
</pre>
</div>
<div class="refsect1">
<a name="GwyNullStore.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
<p>
GwyNullStore implements
<a href="http://developer.gnome.org/doc/API/2.0/gtk/GtkTreeModel.html#GtkTreeModel-struct">GtkTreeModel</a>.</p>
</div>
<div class="refsect1">
<a name="GwyNullStore.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <libgwydgets/gwydgets.h>
</pre>
</div>
<div class="refsect1">
<a name="GwyNullStore.description"></a><h2>Description</h2>
<p><a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> is a very simple class which pretends to be a <a href="http://developer.gnome.org/doc/API/2.0/gtk/GtkTreeModel.html#GtkTreeModel-struct"><span class="type">GtkTreeModel</span></a> with one column of type <a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-Type-Information.html#G-TYPE-UINT:CAPS"><code class="literal">G_TYPE_UINT</code></a>
whose values are equal to row numbers (counted from 0). In reality the column is purely virtual and the store
always takes up only a small constant amount of memory.</p>
<p>The purpose of <a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> is to provide a low-overhead <a href="http://developer.gnome.org/doc/API/2.0/gtk/GtkTreeModel.html#GtkTreeModel-struct"><span class="type">GtkTreeModel</span></a> interface for array-like (and other
indexed) data structures.</p>
<p>A new null store can be created with <a class="link" href="GwyNullStore.html#gwy-null-store-new" title="gwy_null_store_new ()"><code class="function">gwy_null_store_new()</code></a>, then number of virtual rows can be controlled with
<a class="link" href="GwyNullStore.html#gwy-null-store-set-n-rows" title="gwy_null_store_set_n_rows ()"><code class="function">gwy_null_store_set_n_rows()</code></a>. For convenience, a method to emit "row-changed" signal on a row by its index is
provided: <a class="link" href="GwyNullStore.html#gwy-null-store-row-changed" title="gwy_null_store_row_changed ()"><code class="function">gwy_null_store_row_changed()</code></a>.</p>
<p>Since null stores often serve as wrappers around other data structures, convenience methods to attach and obtain
such a data are provided: <a class="link" href="GwyNullStore.html#gwy-null-store-set-model" title="gwy_null_store_set_model ()"><code class="function">gwy_null_store_set_model()</code></a>, <a class="link" href="GwyNullStore.html#gwy-null-store-get-model" title="gwy_null_store_get_model ()"><code class="function">gwy_null_store_get_model()</code></a>.</p>
<p>A simple example to create a multiplication table with null storage:</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="n">GtkWidget</span><span class="w"> </span><span class="o">*</span><span class="n">treeview</span><span class="p">;</span><span class="w"></span>
<span class="n">GtkTreeViewColumn</span><span class="w"> </span><span class="o">*</span><span class="n">column</span><span class="p">;</span><span class="w"></span>
<span class="n">GtkCellRenderer</span><span class="w"> </span><span class="o">*</span><span class="n">renderer</span><span class="p">;</span><span class="w"></span>
<span class="n">GwyNullStore</span><span class="w"> </span><span class="o">*</span><span class="n">store</span><span class="p">;</span><span class="w"></span>
<span class="n">gint</span><span class="w"> </span><span class="n">i</span><span class="p">;</span><span class="w"></span>
<span class="n">store</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">gwy_null_store_new</span><span class="p">(</span><span class="mi">10</span><span class="p">);</span><span class="w"></span>
<span class="n">treeview</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">gtk_tree_view_new_with_model</span><span class="p">(</span><span class="n">GTK_TREE_MODEL</span><span class="p">(</span><span class="n">store</span><span class="p">));</span><span class="w"></span>
<span class="n">gtk_tree_view_set_headers_visible</span><span class="p">(</span><span class="n">GTK_TREE_VIEW</span><span class="p">(</span><span class="n">treeview</span><span class="p">),</span><span class="w"> </span><span class="n">FALSE</span><span class="p">);</span><span class="w"></span>
<span class="n">column</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">gtk_tree_view_column_new</span><span class="p">();</span><span class="w"></span>
<span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="n">i</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="w"> </span><span class="o"><=</span><span class="w"> </span><span class="mi">10</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="o">++</span><span class="p">)</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="n">renderer</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">gtk_cell_renderer_text_new</span><span class="p">();</span><span class="w"></span>
<span class="w"> </span><span class="n">g_object_set</span><span class="p">(</span><span class="n">renderer</span><span class="p">,</span><span class="w"> </span><span class="s">"xalign"</span><span class="p">,</span><span class="w"> </span><span class="mf">1.0</span><span class="p">,</span><span class="w"> </span><span class="s">"width-chars"</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p">,</span><span class="w"> </span><span class="nb">NULL</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="n">gtk_tree_view_column_pack_start</span><span class="p">(</span><span class="n">column</span><span class="p">,</span><span class="w"> </span><span class="n">renderer</span><span class="p">,</span><span class="w"> </span><span class="n">TRUE</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="n">gtk_tree_view_column_set_cell_data_func</span><span class="p">(</span><span class="n">column</span><span class="p">,</span><span class="w"> </span><span class="n">renderer</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">multiply</span><span class="p">,</span><span class="w"> </span><span class="n">GINT_TO_POINTER</span><span class="p">(</span><span class="n">i</span><span class="p">),</span><span class="w"></span>
<span class="w"> </span><span class="nb">NULL</span><span class="p">);</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
<span class="n">gtk_tree_view_append_column</span><span class="p">(</span><span class="n">GTK_TREE_VIEW</span><span class="p">(</span><span class="n">treeview</span><span class="p">),</span><span class="w"> </span><span class="n">column</span><span class="p">);</span><span class="w"></span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>The cell data function multiply() just multiplies the column number with the number of (virtual) null store
row:</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13
14</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="k">static</span><span class="w"> </span><span class="kt">void</span><span class="w"></span>
<span class="nf">multiply</span><span class="p">(</span><span class="n">GtkTreeViewColumn</span><span class="w"> </span><span class="o">*</span><span class="n">column</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">GtkCellRenderer</span><span class="w"> </span><span class="o">*</span><span class="n">renderer</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">GtkTreeModel</span><span class="w"> </span><span class="o">*</span><span class="n">model</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">GtkTreeIter</span><span class="w"> </span><span class="o">*</span><span class="n">iter</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">gpointer</span><span class="w"> </span><span class="n">data</span><span class="p">)</span><span class="w"></span>
<span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="n">gchar</span><span class="w"> </span><span class="n">buf</span><span class="p">[</span><span class="mi">20</span><span class="p">];</span><span class="w"></span>
<span class="w"> </span><span class="n">gint</span><span class="w"> </span><span class="n">i</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="n">gtk_tree_model_get</span><span class="p">(</span><span class="n">model</span><span class="p">,</span><span class="w"> </span><span class="n">iter</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">i</span><span class="p">,</span><span class="w"> </span><span class="mi">-1</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="n">g_snprintf</span><span class="p">(</span><span class="n">buf</span><span class="p">,</span><span class="w"> </span><span class="k">sizeof</span><span class="p">(</span><span class="n">buf</span><span class="p">),</span><span class="w"> </span><span class="s">"%d"</span><span class="p">,</span><span class="w"> </span><span class="p">(</span><span class="n">i</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="mi">1</span><span class="p">)</span><span class="o">*</span><span class="n">GPOINTER_TO_INT</span><span class="p">(</span><span class="n">data</span><span class="p">));</span><span class="w"></span>
<span class="w"> </span><span class="n">g_object_set</span><span class="p">(</span><span class="n">renderer</span><span class="p">,</span><span class="w"> </span><span class="s">"text"</span><span class="p">,</span><span class="w"> </span><span class="n">buf</span><span class="p">,</span><span class="w"> </span><span class="nb">NULL</span><span class="p">);</span><span class="w"></span>
<span class="p">}</span><span class="w"></span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>To extend the multiplication table to 20 rows, one only needs</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="n">gwy_null_store_set_n_rows</span><span class="p">(</span><span class="n">store</span><span class="p">,</span><span class="w"> </span><span class="mi">20</span><span class="p">);</span><span class="w"></span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="refsect1">
<a name="GwyNullStore.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gwy-null-store-new"></a><h3>gwy_null_store_new ()</h3>
<pre class="programlisting"><a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="returnvalue">GwyNullStore</span></a> *
gwy_null_store_new (<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> n</code></em>);</pre>
<p>Creates a new <a href="http://developer.gnome.org/doc/API/2.0/gtk/GtkTreeModel.html#GtkTreeModel-struct"><span class="type">GtkTreeModel</span></a> wrapper around nothing.</p>
<div class="refsect3">
<a name="gwy-null-store-new.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>n</p></td>
<td class="parameter_description"><p>The initial number of rows.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gwy-null-store-new.returns"></a><h4>Returns</h4>
<p> The newly created null store.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-null-store-get-n-rows"></a><h3>gwy_null_store_get_n_rows ()</h3>
<pre class="programlisting"><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
gwy_null_store_get_n_rows (<em class="parameter"><code><a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> *store</code></em>);</pre>
<p>Gets the number of imaginary rows in a null store.</p>
<p>This is a convenience function, the same information can be obtained with <a href="http://developer.gnome.org/doc/API/2.0/gtk/GtkTreeModel.html#gtk-tree-model-iter-n-children"><code class="function">gtk_tree_model_iter_n_children()</code></a>.</p>
<div class="refsect3">
<a name="gwy-null-store-get-n-rows.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>store</p></td>
<td class="parameter_description"><p>A null store.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gwy-null-store-get-n-rows.returns"></a><h4>Returns</h4>
<p> The number of rows.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-null-store-set-n-rows"></a><h3>gwy_null_store_set_n_rows ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_null_store_set_n_rows (<em class="parameter"><code><a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> *store</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> n</code></em>);</pre>
<p>Sets the number of imaginary rows in a null store.</p>
<p>If the new number of rows is larger than the current one, rows will be sequentially and virtually appended to the
end of the store until the requested number of rows is reached.</p>
<p>Similarly, if the new number of rows is smaller then the current one, rows will be sequentially and virtually
deleted from the end of the store until the requested number of rows is reached.</p>
<p>Note for radical changes it is usually more useful to disconnect the model from its view(s), change the number of
rows, and then reconnect.</p>
<div class="refsect3">
<a name="gwy-null-store-set-n-rows.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>store</p></td>
<td class="parameter_description"><p>A null store.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>n</p></td>
<td class="parameter_description"><p>The new number of rows.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-null-store-get-model"></a><h3>gwy_null_store_get_model ()</h3>
<pre class="programlisting"><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gpointer"><span class="returnvalue">gpointer</span></a>
gwy_null_store_get_model (<em class="parameter"><code><a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> *store</code></em>);</pre>
<p>Gets the model pointer of a null store.</p>
<div class="refsect3">
<a name="gwy-null-store-get-model.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>store</p></td>
<td class="parameter_description"><p>A null store.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gwy-null-store-get-model.returns"></a><h4>Returns</h4>
<p> The pointer set with <a class="link" href="GwyNullStore.html#gwy-null-store-set-model" title="gwy_null_store_set_model ()"><code class="function">gwy_null_store_set_model()</code></a>.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-null-store-set-model"></a><h3>gwy_null_store_set_model ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_null_store_set_model (<em class="parameter"><code><a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> *store</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> model</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> destroy</code></em>);</pre>
<p>Sets the model pointer of a null store.</p>
<p>While the virtual integers in <a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> can be used directly, a null store typically serves as an adaptor for
array-like structures and its rows are used as indices to these structures. This helper method provides means to
attach such a structure to a null store in the common case.</p>
<p>The store itself does not interpret nor access the attached data by any means. No signals are emitted in response
to the model pointer change either, particularly because it is expected to be set only once upon creation (null
stores are cheap).</p>
<p>You are free to keep the model pointer at <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if these functions do not suit your needs.</p>
<div class="refsect3">
<a name="gwy-null-store-set-model.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>store</p></td>
<td class="parameter_description"><p>A null store.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>model</p></td>
<td class="parameter_description"><p>Model pointer.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>destroy</p></td>
<td class="parameter_description"><p>Function to call on <em class="parameter"><code>model</code></em>
when it is replaced or the store is destroyed.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-null-store-row-changed"></a><h3>gwy_null_store_row_changed ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_null_store_row_changed (<em class="parameter"><code><a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> *store</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> i</code></em>);</pre>
<p>Emits "GtkTreeModel::row-changed" signal on a null store.</p>
<p>This is a convenience method, with a bit more work the same effect can be achieved with
<a href="/usr/share/gtk-doc/html/gtk3/GtkTreeModel.html#gtk-tree-model-row-changed"><code class="function">gtk_tree_model_row_changed()</code></a>.</p>
<div class="refsect3">
<a name="gwy-null-store-row-changed.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>store</p></td>
<td class="parameter_description"><p>A null store.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>i</p></td>
<td class="parameter_description"><p>A row to emit "row-changed" on.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gwy-null-store-rows-changed"></a><h3>gwy_null_store_rows_changed ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gwy_null_store_rows_changed (<em class="parameter"><code><a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> *store</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> ifrom</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> ito</code></em>);</pre>
<p>Emits "GtkTreeModel::row-changed" signal on a block of rows in a null store.</p>
<p>This is a convenience method, with a bit more work the same effect can be achieved with
<a href="/usr/share/gtk-doc/html/gtk3/GtkTreeModel.html#gtk-tree-model-row-changed"><code class="function">gtk_tree_model_row_changed()</code></a>.</p>
<p>It is possible to pass <em class="parameter"><code>ifrom</code></em>
larger than <em class="parameter"><code>ito</code></em>
. The signal is then emitted for the same rows, but in the opposite
order.</p>
<div class="refsect3">
<a name="gwy-null-store-rows-changed.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>store</p></td>
<td class="parameter_description"><p>A null store.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>ifrom</p></td>
<td class="parameter_description"><p>The first row to emit "row-changed" on.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>ito</p></td>
<td class="parameter_description"><p>The last row to emit "row-changed" on (inclusive).</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-2-62.html#api-index-2.62">2.62</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gwy-null-store-iter-is-valid"></a><h3>gwy_null_store_iter_is_valid ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gwy_null_store_iter_is_valid (<em class="parameter"><code><a class="link" href="GwyNullStore.html" title="GwyNullStore"><span class="type">GwyNullStore</span></a> *store</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gtk3/GtkTreeModel.html#GtkTreeIter-struct"><span class="type">GtkTreeIter</span></a> *iter</code></em>);</pre>
<p>Checks if the given iter is a valid iter for this null store.</p>
<div class="refsect3">
<a name="gwy-null-store-iter-is-valid.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>store</p></td>
<td class="parameter_description"><p>A null store.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>iter</p></td>
<td class="parameter_description"><p>A <a href="/usr/share/gtk-doc/html/gtk3/GtkTreeModel.html#GtkTreeIter-struct"><span class="type">GtkTreeIter</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gwy-null-store-iter-is-valid.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the iter is valid, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if the iter is invalid.</p>
</div>
</div>
</div>
<div class="refsect1">
<a name="GwyNullStore.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GwyNullStore-struct"></a><h3>struct GwyNullStore</h3>
<pre class="programlisting">struct GwyNullStore;</pre>
</div>
<hr>
<div class="refsect2">
<a name="GwyNullStoreClass"></a><h3>struct GwyNullStoreClass</h3>
<pre class="programlisting">struct GwyNullStoreClass {
GObjectClass parent_class;
void (*reserved1)(void);
};
</pre>
</div>
</div>
<div class="refsect1">
<a name="GwyNullStore.see-also"></a><h2>See Also</h2>
<p><a class="link" href="GwyInventoryStore.html" title="GwyInventoryStore"><span class="type">GwyInventoryStore</span></a> -- <a href="/usr/share/gtk-doc/html/gtk3/GtkTreeModel.html#GtkTreeModel-struct"><span class="type">GtkTreeModel</span></a> wrapper around <a href="../GwyInventory.html#GwyInventory-struct"><span class="type">GwyInventory</span></a></p>
</div>
</div>
<div class="footer">
<hr>Generated by GTK-Doc V1.19</div>
</body>
</html>
|
