1 
2 static int
overview(struct nk_context * ctx)3 overview(struct nk_context *ctx)
4 {
5     /* window flags */
6     static int show_menu = nk_true;
7     static int titlebar = nk_true;
8     static int border = nk_true;
9     static int resize = nk_true;
10     static int movable = nk_true;
11     static int no_scrollbar = nk_false;
12     static int scale_left = nk_false;
13     static nk_flags window_flags = 0;
14     static int minimizable = nk_true;
15 
16     /* popups */
17     static enum nk_style_header_align header_align = NK_HEADER_RIGHT;
18     static int show_app_about = nk_false;
19 
20     /* window flags */
21     window_flags = 0;
22     ctx->style.window.header.align = header_align;
23     if (border) window_flags |= NK_WINDOW_BORDER;
24     if (resize) window_flags |= NK_WINDOW_SCALABLE;
25     if (movable) window_flags |= NK_WINDOW_MOVABLE;
26     if (no_scrollbar) window_flags |= NK_WINDOW_NO_SCROLLBAR;
27     if (scale_left) window_flags |= NK_WINDOW_SCALE_LEFT;
28     if (minimizable) window_flags |= NK_WINDOW_MINIMIZABLE;
29 
30     if (nk_begin(ctx, "Overview", nk_rect(10, 10, 400, 600), window_flags))
31     {
32         if (show_menu)
33         {
34             /* menubar */
35             enum menu_states {MENU_DEFAULT, MENU_WINDOWS};
36             static nk_size mprog = 60;
37             static int mslider = 10;
38             static int mcheck = nk_true;
39             nk_menubar_begin(ctx);
40 
41             /* menu #1 */
42             nk_layout_row_begin(ctx, NK_STATIC, 25, 5);
43             nk_layout_row_push(ctx, 45);
44             if (nk_menu_begin_label(ctx, "MENU", NK_TEXT_LEFT, nk_vec2(120, 200)))
45             {
46                 static size_t prog = 40;
47                 static int slider = 10;
48                 static int check = nk_true;
49                 nk_layout_row_dynamic(ctx, 25, 1);
50                 if (nk_menu_item_label(ctx, "Hide", NK_TEXT_LEFT))
51                     show_menu = nk_false;
52                 if (nk_menu_item_label(ctx, "About", NK_TEXT_LEFT))
53                     show_app_about = nk_true;
54                 nk_progress(ctx, &prog, 100, NK_MODIFIABLE);
55                 nk_slider_int(ctx, 0, &slider, 16, 1);
56                 nk_checkbox_label(ctx, "check", &check);
57                 nk_menu_end(ctx);
58             }
59             /* menu #2 */
60             nk_layout_row_push(ctx, 60);
61             if (nk_menu_begin_label(ctx, "ADVANCED", NK_TEXT_LEFT, nk_vec2(200, 600)))
62             {
63                 enum menu_state {MENU_NONE,MENU_FILE, MENU_EDIT,MENU_VIEW,MENU_CHART};
64                 static enum menu_state menu_state = MENU_NONE;
65                 enum nk_collapse_states state;
66 
67                 state = (menu_state == MENU_FILE) ? NK_MAXIMIZED: NK_MINIMIZED;
68                 if (nk_tree_state_push(ctx, NK_TREE_TAB, "FILE", &state)) {
69                     menu_state = MENU_FILE;
70                     nk_menu_item_label(ctx, "New", NK_TEXT_LEFT);
71                     nk_menu_item_label(ctx, "Open", NK_TEXT_LEFT);
72                     nk_menu_item_label(ctx, "Save", NK_TEXT_LEFT);
73                     nk_menu_item_label(ctx, "Close", NK_TEXT_LEFT);
74                     nk_menu_item_label(ctx, "Exit", NK_TEXT_LEFT);
75                     nk_tree_pop(ctx);
76                 } else menu_state = (menu_state == MENU_FILE) ? MENU_NONE: menu_state;
77 
78                 state = (menu_state == MENU_EDIT) ? NK_MAXIMIZED: NK_MINIMIZED;
79                 if (nk_tree_state_push(ctx, NK_TREE_TAB, "EDIT", &state)) {
80                     menu_state = MENU_EDIT;
81                     nk_menu_item_label(ctx, "Copy", NK_TEXT_LEFT);
82                     nk_menu_item_label(ctx, "Delete", NK_TEXT_LEFT);
83                     nk_menu_item_label(ctx, "Cut", NK_TEXT_LEFT);
84                     nk_menu_item_label(ctx, "Paste", NK_TEXT_LEFT);
85                     nk_tree_pop(ctx);
86                 } else menu_state = (menu_state == MENU_EDIT) ? MENU_NONE: menu_state;
87 
88                 state = (menu_state == MENU_VIEW) ? NK_MAXIMIZED: NK_MINIMIZED;
89                 if (nk_tree_state_push(ctx, NK_TREE_TAB, "VIEW", &state)) {
90                     menu_state = MENU_VIEW;
91                     nk_menu_item_label(ctx, "About", NK_TEXT_LEFT);
92                     nk_menu_item_label(ctx, "Options", NK_TEXT_LEFT);
93                     nk_menu_item_label(ctx, "Customize", NK_TEXT_LEFT);
94                     nk_tree_pop(ctx);
95                 } else menu_state = (menu_state == MENU_VIEW) ? MENU_NONE: menu_state;
96 
97                 state = (menu_state == MENU_CHART) ? NK_MAXIMIZED: NK_MINIMIZED;
98                 if (nk_tree_state_push(ctx, NK_TREE_TAB, "CHART", &state)) {
99                     size_t i = 0;
100                     const float values[]={26.0f,13.0f,30.0f,15.0f,25.0f,10.0f,20.0f,40.0f,12.0f,8.0f,22.0f,28.0f};
101                     menu_state = MENU_CHART;
102                     nk_layout_row_dynamic(ctx, 150, 1);
103                     nk_chart_begin(ctx, NK_CHART_COLUMN, NK_LEN(values), 0, 50);
104                     for (i = 0; i < NK_LEN(values); ++i)
105                         nk_chart_push(ctx, values[i]);
106                     nk_chart_end(ctx);
107                     nk_tree_pop(ctx);
108                 } else menu_state = (menu_state == MENU_CHART) ? MENU_NONE: menu_state;
109                 nk_menu_end(ctx);
110             }
111             /* menu widgets */
112             nk_layout_row_push(ctx, 70);
113             nk_progress(ctx, &mprog, 100, NK_MODIFIABLE);
114             nk_slider_int(ctx, 0, &mslider, 16, 1);
115             nk_checkbox_label(ctx, "check", &mcheck);
116             nk_menubar_end(ctx);
117         }
118 
119         if (show_app_about)
120         {
121             /* about popup */
122             static struct nk_rect s = {20, 100, 300, 190};
123             if (nk_popup_begin(ctx, NK_POPUP_STATIC, "About", NK_WINDOW_CLOSABLE, s))
124             {
125                 nk_layout_row_dynamic(ctx, 20, 1);
126                 nk_label(ctx, "Nuklear", NK_TEXT_LEFT);
127                 nk_label(ctx, "By Micha Mettke", NK_TEXT_LEFT);
128                 nk_label(ctx, "nuklear is licensed under the public domain License.",  NK_TEXT_LEFT);
129                 nk_popup_end(ctx);
130             } else show_app_about = nk_false;
131         }
132 
133         /* window flags */
134         if (nk_tree_push(ctx, NK_TREE_TAB, "Window", NK_MINIMIZED)) {
135             nk_layout_row_dynamic(ctx, 30, 2);
136             nk_checkbox_label(ctx, "Titlebar", &titlebar);
137             nk_checkbox_label(ctx, "Menu", &show_menu);
138             nk_checkbox_label(ctx, "Border", &border);
139             nk_checkbox_label(ctx, "Resizable", &resize);
140             nk_checkbox_label(ctx, "Movable", &movable);
141             nk_checkbox_label(ctx, "No Scrollbar", &no_scrollbar);
142             nk_checkbox_label(ctx, "Minimizable", &minimizable);
143             nk_checkbox_label(ctx, "Scale Left", &scale_left);
144             nk_tree_pop(ctx);
145         }
146 
147         if (nk_tree_push(ctx, NK_TREE_TAB, "Widgets", NK_MINIMIZED))
148         {
149             enum options {A,B,C};
150             static int checkbox;
151             static int option;
152             if (nk_tree_push(ctx, NK_TREE_NODE, "Text", NK_MINIMIZED))
153             {
154                 /* Text Widgets */
155                 nk_layout_row_dynamic(ctx, 20, 1);
156                 nk_label(ctx, "Label aligned left", NK_TEXT_LEFT);
157                 nk_label(ctx, "Label aligned centered", NK_TEXT_CENTERED);
158                 nk_label(ctx, "Label aligned right", NK_TEXT_RIGHT);
159                 nk_label_colored(ctx, "Blue text", NK_TEXT_LEFT, nk_rgb(0,0,255));
160                 nk_label_colored(ctx, "Yellow text", NK_TEXT_LEFT, nk_rgb(255,255,0));
161                 nk_text(ctx, "Text without /0", 15, NK_TEXT_RIGHT);
162 
163                 nk_layout_row_static(ctx, 100, 200, 1);
164                 nk_label_wrap(ctx, "This is a very long line to hopefully get this text to be wrapped into multiple lines to show line wrapping");
165                 nk_layout_row_dynamic(ctx, 100, 1);
166                 nk_label_wrap(ctx, "This is another long text to show dynamic window changes on multiline text");
167                 nk_tree_pop(ctx);
168             }
169 
170             if (nk_tree_push(ctx, NK_TREE_NODE, "Button", NK_MINIMIZED))
171             {
172                 /* Buttons Widgets */
173                 nk_layout_row_static(ctx, 30, 100, 3);
174                 if (nk_button_label(ctx, "Button"))
175                     fprintf(stdout, "Button pressed!\n");
176                 nk_button_set_behavior(ctx, NK_BUTTON_REPEATER);
177                 if (nk_button_label(ctx, "Repeater"))
178                     fprintf(stdout, "Repeater is being pressed!\n");
179                 nk_button_set_behavior(ctx, NK_BUTTON_DEFAULT);
180                 nk_button_color(ctx, nk_rgb(0,0,255));
181 
182                 nk_layout_row_static(ctx, 25, 25, 8);
183                 nk_button_symbol(ctx, NK_SYMBOL_CIRCLE_SOLID);
184                 nk_button_symbol(ctx, NK_SYMBOL_CIRCLE_OUTLINE);
185                 nk_button_symbol(ctx, NK_SYMBOL_RECT_SOLID);
186                 nk_button_symbol(ctx, NK_SYMBOL_RECT_OUTLINE);
187                 nk_button_symbol(ctx, NK_SYMBOL_TRIANGLE_UP);
188                 nk_button_symbol(ctx, NK_SYMBOL_TRIANGLE_DOWN);
189                 nk_button_symbol(ctx, NK_SYMBOL_TRIANGLE_LEFT);
190                 nk_button_symbol(ctx, NK_SYMBOL_TRIANGLE_RIGHT);
191 
192                 nk_layout_row_static(ctx, 30, 100, 2);
193                 nk_button_symbol_label(ctx, NK_SYMBOL_TRIANGLE_LEFT, "prev", NK_TEXT_RIGHT);
194                 nk_button_symbol_label(ctx, NK_SYMBOL_TRIANGLE_RIGHT, "next", NK_TEXT_LEFT);
195                 nk_tree_pop(ctx);
196             }
197 
198             if (nk_tree_push(ctx, NK_TREE_NODE, "Basic", NK_MINIMIZED))
199             {
200                 /* Basic widgets */
201                 static int int_slider = 5;
202                 static float float_slider = 2.5f;
203                 static size_t prog_value = 40;
204                 static float property_float = 2;
205                 static int property_int = 10;
206                 static int property_neg = 10;
207 
208                 static float range_float_min = 0;
209                 static float range_float_max = 100;
210                 static float range_float_value = 50;
211                 static int range_int_min = 0;
212                 static int range_int_value = 2048;
213                 static int range_int_max = 4096;
214                 static const float ratio[] = {120, 150};
215 
216                 nk_layout_row_static(ctx, 30, 100, 1);
217                 nk_checkbox_label(ctx, "Checkbox", &checkbox);
218 
219                 nk_layout_row_static(ctx, 30, 80, 3);
220                 option = nk_option_label(ctx, "optionA", option == A) ? A : option;
221                 option = nk_option_label(ctx, "optionB", option == B) ? B : option;
222                 option = nk_option_label(ctx, "optionC", option == C) ? C : option;
223 
224 
225                 nk_layout_row(ctx, NK_STATIC, 30, 2, ratio);
226                 nk_labelf(ctx, NK_TEXT_LEFT, "Slider int");
227                 nk_slider_int(ctx, 0, &int_slider, 10, 1);
228 
229                 nk_label(ctx, "Slider float", NK_TEXT_LEFT);
230                 nk_slider_float(ctx, 0, &float_slider, 5.0, 0.5f);
231                 nk_labelf(ctx, NK_TEXT_LEFT, "Progressbar: %zu" , prog_value);
232                 nk_progress(ctx, &prog_value, 100, NK_MODIFIABLE);
233 
234                 nk_layout_row(ctx, NK_STATIC, 25, 2, ratio);
235                 nk_label(ctx, "Property float:", NK_TEXT_LEFT);
236                 nk_property_float(ctx, "Float:", 0, &property_float, 64.0f, 0.1f, 0.2f);
237                 nk_label(ctx, "Property int:", NK_TEXT_LEFT);
238                 nk_property_int(ctx, "Int:", 0, &property_int, 100.0f, 1, 1);
239                 nk_label(ctx, "Property neg:", NK_TEXT_LEFT);
240                 nk_property_int(ctx, "Neg:", -10, &property_neg, 10, 1, 1);
241 
242                 nk_layout_row_dynamic(ctx, 25, 1);
243                 nk_label(ctx, "Range:", NK_TEXT_LEFT);
244                 nk_layout_row_dynamic(ctx, 25, 3);
245                 nk_property_float(ctx, "#min:", 0, &range_float_min, range_float_max, 1.0f, 0.2f);
246                 nk_property_float(ctx, "#float:", range_float_min, &range_float_value, range_float_max, 1.0f, 0.2f);
247                 nk_property_float(ctx, "#max:", range_float_min, &range_float_max, 100, 1.0f, 0.2f);
248 
249                 nk_property_int(ctx, "#min:", INT_MIN, &range_int_min, range_int_max, 1, 10);
250                 nk_property_int(ctx, "#neg:", range_int_min, &range_int_value, range_int_max, 1, 10);
251                 nk_property_int(ctx, "#max:", range_int_min, &range_int_max, INT_MAX, 1, 10);
252 
253                 nk_tree_pop(ctx);
254             }
255 
256             if (nk_tree_push(ctx, NK_TREE_NODE, "Selectable", NK_MINIMIZED))
257             {
258                 if (nk_tree_push(ctx, NK_TREE_NODE, "List", NK_MINIMIZED))
259                 {
260                     static int selected[4] = {nk_false, nk_false, nk_true, nk_false};
261                     nk_layout_row_static(ctx, 18, 100, 1);
262                     nk_selectable_label(ctx, "Selectable", NK_TEXT_LEFT, &selected[0]);
263                     nk_selectable_label(ctx, "Selectable", NK_TEXT_LEFT, &selected[1]);
264                     nk_label(ctx, "Not Selectable", NK_TEXT_LEFT);
265                     nk_selectable_label(ctx, "Selectable", NK_TEXT_LEFT, &selected[2]);
266                     nk_selectable_label(ctx, "Selectable", NK_TEXT_LEFT, &selected[3]);
267                     nk_tree_pop(ctx);
268                 }
269                 if (nk_tree_push(ctx, NK_TREE_NODE, "Grid", NK_MINIMIZED))
270                 {
271                     int i;
272                     static int selected[16] = {1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0,0,1};
273                     nk_layout_row_static(ctx, 50, 50, 4);
274                     for (i = 0; i < 16; ++i) {
275                         if (nk_selectable_label(ctx, "Z", NK_TEXT_CENTERED, &selected[i])) {
276                             int x = (i % 4), y = i / 4;
277                             if (x > 0) selected[i - 1] ^= 1;
278                             if (x < 3) selected[i + 1] ^= 1;
279                             if (y > 0) selected[i - 4] ^= 1;
280                             if (y < 3) selected[i + 4] ^= 1;
281                         }
282                     }
283                     nk_tree_pop(ctx);
284                 }
285                 nk_tree_pop(ctx);
286             }
287 
288             if (nk_tree_push(ctx, NK_TREE_NODE, "Combo", NK_MINIMIZED))
289             {
290                 /* Combobox Widgets
291                  * In this library comboboxes are not limited to being a popup
292                  * list of selectable text. Instead it is a abstract concept of
293                  * having something that is *selected* or displayed, a popup window
294                  * which opens if something needs to be modified and the content
295                  * of the popup which causes the *selected* or displayed value to
296                  * change or if wanted close the combobox.
297                  *
298                  * While strange at first handling comboboxes in a abstract way
299                  * solves the problem of overloaded window content. For example
300                  * changing a color value requires 4 value modifier (slider, property,...)
301                  * for RGBA then you need a label and ways to display the current color.
302                  * If you want to go fancy you even add rgb and hsv ratio boxes.
303                  * While fine for one color if you have a lot of them it because
304                  * tedious to look at and quite wasteful in space. You could add
305                  * a popup which modifies the color but this does not solve the
306                  * fact that it still requires a lot of cluttered space to do.
307                  *
308                  * In these kind of instance abstract comboboxes are quite handy. All
309                  * value modifiers are hidden inside the combobox popup and only
310                  * the color is shown if not open. This combines the clarity of the
311                  * popup with the ease of use of just using the space for modifiers.
312                  *
313                  * Other instances are for example time and especially date picker,
314                  * which only show the currently activated time/data and hide the
315                  * selection logic inside the combobox popup.
316                  */
317                 static float chart_selection = 8.0f;
318                 static int current_weapon = 0;
319                 static int check_values[5];
320                 static float position[3];
321                 static struct nk_color combo_color = {130, 50, 50, 255};
322                 static struct nk_colorf combo_color2 = {0.509f, 0.705f, 0.2f, 1.0f};
323                 static size_t prog_a =  20, prog_b = 40, prog_c = 10, prog_d = 90;
324                 static const char *weapons[] = {"Fist","Pistol","Shotgun","Plasma","BFG"};
325 
326                 char buffer[64];
327                 size_t sum = 0;
328 
329                 /* default combobox */
330                 nk_layout_row_static(ctx, 25, 200, 1);
331                 current_weapon = nk_combo(ctx, weapons, NK_LEN(weapons), current_weapon, 25, nk_vec2(200,200));
332 
333                 /* slider color combobox */
334                 if (nk_combo_begin_color(ctx, combo_color, nk_vec2(200,200))) {
335                     float ratios[] = {0.15f, 0.85f};
336                     nk_layout_row(ctx, NK_DYNAMIC, 30, 2, ratios);
337                     nk_label(ctx, "R:", NK_TEXT_LEFT);
338                     combo_color.r = (nk_byte)nk_slide_int(ctx, 0, combo_color.r, 255, 5);
339                     nk_label(ctx, "G:", NK_TEXT_LEFT);
340                     combo_color.g = (nk_byte)nk_slide_int(ctx, 0, combo_color.g, 255, 5);
341                     nk_label(ctx, "B:", NK_TEXT_LEFT);
342                     combo_color.b = (nk_byte)nk_slide_int(ctx, 0, combo_color.b, 255, 5);
343                     nk_label(ctx, "A:", NK_TEXT_LEFT);
344                     combo_color.a = (nk_byte)nk_slide_int(ctx, 0, combo_color.a , 255, 5);
345                     nk_combo_end(ctx);
346                 }
347                 /* complex color combobox */
348                 if (nk_combo_begin_color(ctx, nk_rgb_cf(combo_color2), nk_vec2(200,400))) {
349                     enum color_mode {COL_RGB, COL_HSV};
350                     static int col_mode = COL_RGB;
351                     #ifndef DEMO_DO_NOT_USE_COLOR_PICKER
352                     nk_layout_row_dynamic(ctx, 120, 1);
353                     combo_color2 = nk_color_picker(ctx, combo_color2, NK_RGBA);
354                     #endif
355 
356                     nk_layout_row_dynamic(ctx, 25, 2);
357                     col_mode = nk_option_label(ctx, "RGB", col_mode == COL_RGB) ? COL_RGB : col_mode;
358                     col_mode = nk_option_label(ctx, "HSV", col_mode == COL_HSV) ? COL_HSV : col_mode;
359 
360                     nk_layout_row_dynamic(ctx, 25, 1);
361                     if (col_mode == COL_RGB) {
362                         combo_color2.r = nk_propertyf(ctx, "#R:", 0, combo_color2.r, 1.0f, 0.01f,0.005f);
363                         combo_color2.g = nk_propertyf(ctx, "#G:", 0, combo_color2.g, 1.0f, 0.01f,0.005f);
364                         combo_color2.b = nk_propertyf(ctx, "#B:", 0, combo_color2.b, 1.0f, 0.01f,0.005f);
365                         combo_color2.a = nk_propertyf(ctx, "#A:", 0, combo_color2.a, 1.0f, 0.01f,0.005f);
366                     } else {
367                         float hsva[4];
368                         nk_colorf_hsva_fv(hsva, combo_color2);
369                         hsva[0] = nk_propertyf(ctx, "#H:", 0, hsva[0], 1.0f, 0.01f,0.05f);
370                         hsva[1] = nk_propertyf(ctx, "#S:", 0, hsva[1], 1.0f, 0.01f,0.05f);
371                         hsva[2] = nk_propertyf(ctx, "#V:", 0, hsva[2], 1.0f, 0.01f,0.05f);
372                         hsva[3] = nk_propertyf(ctx, "#A:", 0, hsva[3], 1.0f, 0.01f,0.05f);
373                         combo_color2 = nk_hsva_colorfv(hsva);
374                     }
375                     nk_combo_end(ctx);
376                 }
377                 /* progressbar combobox */
378                 sum = prog_a + prog_b + prog_c + prog_d;
379                 sprintf(buffer, "%lu", sum);
380                 if (nk_combo_begin_label(ctx, buffer, nk_vec2(200,200))) {
381                     nk_layout_row_dynamic(ctx, 30, 1);
382                     nk_progress(ctx, &prog_a, 100, NK_MODIFIABLE);
383                     nk_progress(ctx, &prog_b, 100, NK_MODIFIABLE);
384                     nk_progress(ctx, &prog_c, 100, NK_MODIFIABLE);
385                     nk_progress(ctx, &prog_d, 100, NK_MODIFIABLE);
386                     nk_combo_end(ctx);
387                 }
388 
389                 /* checkbox combobox */
390                 sum = (size_t)(check_values[0] + check_values[1] + check_values[2] + check_values[3] + check_values[4]);
391                 sprintf(buffer, "%lu", sum);
392                 if (nk_combo_begin_label(ctx, buffer, nk_vec2(200,200))) {
393                     nk_layout_row_dynamic(ctx, 30, 1);
394                     nk_checkbox_label(ctx, weapons[0], &check_values[0]);
395                     nk_checkbox_label(ctx, weapons[1], &check_values[1]);
396                     nk_checkbox_label(ctx, weapons[2], &check_values[2]);
397                     nk_checkbox_label(ctx, weapons[3], &check_values[3]);
398                     nk_combo_end(ctx);
399                 }
400 
401                 /* complex text combobox */
402                 sprintf(buffer, "%.2f, %.2f, %.2f", position[0], position[1],position[2]);
403                 if (nk_combo_begin_label(ctx, buffer, nk_vec2(200,200))) {
404                     nk_layout_row_dynamic(ctx, 25, 1);
405                     nk_property_float(ctx, "#X:", -1024.0f, &position[0], 1024.0f, 1,0.5f);
406                     nk_property_float(ctx, "#Y:", -1024.0f, &position[1], 1024.0f, 1,0.5f);
407                     nk_property_float(ctx, "#Z:", -1024.0f, &position[2], 1024.0f, 1,0.5f);
408                     nk_combo_end(ctx);
409                 }
410 
411                 /* chart combobox */
412                 sprintf(buffer, "%.1f", chart_selection);
413                 if (nk_combo_begin_label(ctx, buffer, nk_vec2(200,250))) {
414                     size_t i = 0;
415                     static const float values[]={26.0f,13.0f,30.0f,15.0f,25.0f,10.0f,20.0f,40.0f, 12.0f, 8.0f, 22.0f, 28.0f, 5.0f};
416                     nk_layout_row_dynamic(ctx, 150, 1);
417                     nk_chart_begin(ctx, NK_CHART_COLUMN, NK_LEN(values), 0, 50);
418                     for (i = 0; i < NK_LEN(values); ++i) {
419                         nk_flags res = nk_chart_push(ctx, values[i]);
420                         if (res & NK_CHART_CLICKED) {
421                             chart_selection = values[i];
422                             nk_combo_close(ctx);
423                         }
424                     }
425                     nk_chart_end(ctx);
426                     nk_combo_end(ctx);
427                 }
428 
429                 {
430                     static int time_selected = 0;
431                     static int date_selected = 0;
432                     static struct tm sel_time;
433                     static struct tm sel_date;
434                     if (!time_selected || !date_selected) {
435                         /* keep time and date updated if nothing is selected */
436                         time_t cur_time = time(0);
437                         struct tm *n = localtime(&cur_time);
438                         if (!time_selected)
439                             memcpy(&sel_time, n, sizeof(struct tm));
440                         if (!date_selected)
441                             memcpy(&sel_date, n, sizeof(struct tm));
442                     }
443 
444                     /* time combobox */
445                     sprintf(buffer, "%02d:%02d:%02d", sel_time.tm_hour, sel_time.tm_min, sel_time.tm_sec);
446                     if (nk_combo_begin_label(ctx, buffer, nk_vec2(200,250))) {
447                         time_selected = 1;
448                         nk_layout_row_dynamic(ctx, 25, 1);
449                         sel_time.tm_sec = nk_propertyi(ctx, "#S:", 0, sel_time.tm_sec, 60, 1, 1);
450                         sel_time.tm_min = nk_propertyi(ctx, "#M:", 0, sel_time.tm_min, 60, 1, 1);
451                         sel_time.tm_hour = nk_propertyi(ctx, "#H:", 0, sel_time.tm_hour, 23, 1, 1);
452                         nk_combo_end(ctx);
453                     }
454 
455                     /* date combobox */
456                     sprintf(buffer, "%02d-%02d-%02d", sel_date.tm_mday, sel_date.tm_mon+1, sel_date.tm_year+1900);
457                     if (nk_combo_begin_label(ctx, buffer, nk_vec2(350,400)))
458                     {
459                         int i = 0;
460                         const char *month[] = {"January", "February", "March",
461                             "April", "May", "June", "July", "August", "September",
462                             "October", "November", "December"};
463                         const char *week_days[] = {"SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT"};
464                         const int month_days[] = {31,28,31,30,31,30,31,31,30,31,30,31};
465                         int year = sel_date.tm_year+1900;
466                         int leap_year = (!(year % 4) && ((year % 100))) || !(year % 400);
467                         int days = (sel_date.tm_mon == 1) ?
468                             month_days[sel_date.tm_mon] + leap_year:
469                             month_days[sel_date.tm_mon];
470 
471                         /* header with month and year */
472                         date_selected = 1;
473                         nk_layout_row_begin(ctx, NK_DYNAMIC, 20, 3);
474                         nk_layout_row_push(ctx, 0.05f);
475                         if (nk_button_symbol(ctx, NK_SYMBOL_TRIANGLE_LEFT)) {
476                             if (sel_date.tm_mon == 0) {
477                                 sel_date.tm_mon = 11;
478                                 sel_date.tm_year = NK_MAX(0, sel_date.tm_year-1);
479                             } else sel_date.tm_mon--;
480                         }
481                         nk_layout_row_push(ctx, 0.9f);
482                         sprintf(buffer, "%s %d", month[sel_date.tm_mon], year);
483                         nk_label(ctx, buffer, NK_TEXT_CENTERED);
484                         nk_layout_row_push(ctx, 0.05f);
485                         if (nk_button_symbol(ctx, NK_SYMBOL_TRIANGLE_RIGHT)) {
486                             if (sel_date.tm_mon == 11) {
487                                 sel_date.tm_mon = 0;
488                                 sel_date.tm_year++;
489                             } else sel_date.tm_mon++;
490                         }
491                         nk_layout_row_end(ctx);
492 
493                         /* good old week day formula (double because precision) */
494                         {int year_n = (sel_date.tm_mon < 2) ? year-1: year;
495                         int y = year_n % 100;
496                         int c = year_n / 100;
497                         int y4 = (int)((float)y / 4);
498                         int c4 = (int)((float)c / 4);
499                         int m = (int)(2.6 * (double)(((sel_date.tm_mon + 10) % 12) + 1) - 0.2);
500                         int week_day = (((1 + m + y + y4 + c4 - 2 * c) % 7) + 7) % 7;
501 
502                         /* weekdays  */
503                         nk_layout_row_dynamic(ctx, 35, 7);
504                         for (i = 0; i < (int)NK_LEN(week_days); ++i)
505                             nk_label(ctx, week_days[i], NK_TEXT_CENTERED);
506 
507                         /* days  */
508                         if (week_day > 0) nk_spacing(ctx, week_day);
509                         for (i = 1; i <= days; ++i) {
510                             sprintf(buffer, "%d", i);
511                             if (nk_button_label(ctx, buffer)) {
512                                 sel_date.tm_mday = i;
513                                 nk_combo_close(ctx);
514                             }
515                         }}
516                         nk_combo_end(ctx);
517                     }
518                 }
519 
520                 nk_tree_pop(ctx);
521             }
522 
523             if (nk_tree_push(ctx, NK_TREE_NODE, "Input", NK_MINIMIZED))
524             {
525                 static const float ratio[] = {120, 150};
526                 static char field_buffer[64];
527                 static char text[9][64];
528                 static int text_len[9];
529                 static char box_buffer[512];
530                 static int field_len;
531                 static int box_len;
532                 nk_flags active;
533 
534                 nk_layout_row(ctx, NK_STATIC, 25, 2, ratio);
535                 nk_label(ctx, "Default:", NK_TEXT_LEFT);
536 
537                 nk_edit_string(ctx, NK_EDIT_SIMPLE, text[0], &text_len[0], 64, nk_filter_default);
538                 nk_label(ctx, "Int:", NK_TEXT_LEFT);
539                 nk_edit_string(ctx, NK_EDIT_SIMPLE, text[1], &text_len[1], 64, nk_filter_decimal);
540                 nk_label(ctx, "Float:", NK_TEXT_LEFT);
541                 nk_edit_string(ctx, NK_EDIT_SIMPLE, text[2], &text_len[2], 64, nk_filter_float);
542                 nk_label(ctx, "Hex:", NK_TEXT_LEFT);
543                 nk_edit_string(ctx, NK_EDIT_SIMPLE, text[4], &text_len[4], 64, nk_filter_hex);
544                 nk_label(ctx, "Octal:", NK_TEXT_LEFT);
545                 nk_edit_string(ctx, NK_EDIT_SIMPLE, text[5], &text_len[5], 64, nk_filter_oct);
546                 nk_label(ctx, "Binary:", NK_TEXT_LEFT);
547                 nk_edit_string(ctx, NK_EDIT_SIMPLE, text[6], &text_len[6], 64, nk_filter_binary);
548 
549                 nk_label(ctx, "Password:", NK_TEXT_LEFT);
550                 {
551                     int i = 0;
552                     int old_len = text_len[8];
553                     char buffer[64];
554                     for (i = 0; i < text_len[8]; ++i) buffer[i] = '*';
555                     nk_edit_string(ctx, NK_EDIT_FIELD, buffer, &text_len[8], 64, nk_filter_default);
556                     if (old_len < text_len[8])
557                         memcpy(&text[8][old_len], &buffer[old_len], (nk_size)(text_len[8] - old_len));
558                 }
559 
560                 nk_label(ctx, "Field:", NK_TEXT_LEFT);
561                 nk_edit_string(ctx, NK_EDIT_FIELD, field_buffer, &field_len, 64, nk_filter_default);
562 
563                 nk_label(ctx, "Box:", NK_TEXT_LEFT);
564                 nk_layout_row_static(ctx, 180, 278, 1);
565                 nk_edit_string(ctx, NK_EDIT_BOX, box_buffer, &box_len, 512, nk_filter_default);
566 
567                 nk_layout_row(ctx, NK_STATIC, 25, 2, ratio);
568                 active = nk_edit_string(ctx, NK_EDIT_FIELD|NK_EDIT_SIG_ENTER, text[7], &text_len[7], 64,  nk_filter_ascii);
569                 if (nk_button_label(ctx, "Submit") ||
570                     (active & NK_EDIT_COMMITED))
571                 {
572                     text[7][text_len[7]] = '\n';
573                     text_len[7]++;
574                     memcpy(&box_buffer[box_len], &text[7], (nk_size)text_len[7]);
575                     box_len += text_len[7];
576                     text_len[7] = 0;
577                 }
578                 nk_tree_pop(ctx);
579             }
580             nk_tree_pop(ctx);
581         }
582 
583         if (nk_tree_push(ctx, NK_TREE_TAB, "Chart", NK_MINIMIZED))
584         {
585             /* Chart Widgets
586              * This library has two different rather simple charts. The line and the
587              * column chart. Both provide a simple way of visualizing values and
588              * have a retained mode and immediate mode API version. For the retain
589              * mode version `nk_plot` and `nk_plot_function` you either provide
590              * an array or a callback to call to handle drawing the graph.
591              * For the immediate mode version you start by calling `nk_chart_begin`
592              * and need to provide min and max values for scaling on the Y-axis.
593              * and then call `nk_chart_push` to push values into the chart.
594              * Finally `nk_chart_end` needs to be called to end the process. */
595             float id = 0;
596             static int col_index = -1;
597             static int line_index = -1;
598             float step = (2*3.141592654f) / 32;
599 
600             int i;
601             int index = -1;
602             struct nk_rect bounds;
603 
604             /* line chart */
605             id = 0;
606             index = -1;
607             nk_layout_row_dynamic(ctx, 100, 1);
608             bounds = nk_widget_bounds(ctx);
609             if (nk_chart_begin(ctx, NK_CHART_LINES, 32, -1.0f, 1.0f)) {
610                 for (i = 0; i < 32; ++i) {
611                     nk_flags res = nk_chart_push(ctx, (float)cos(id));
612                     if (res & NK_CHART_HOVERING)
613                         index = (int)i;
614                     if (res & NK_CHART_CLICKED)
615                         line_index = (int)i;
616                     id += step;
617                 }
618                 nk_chart_end(ctx);
619             }
620 
621             if (index != -1)
622                 nk_tooltipf(ctx, "Value: %.2f", (float)cos((float)index*step));
623             if (line_index != -1) {
624                 nk_layout_row_dynamic(ctx, 20, 1);
625                 nk_labelf(ctx, NK_TEXT_LEFT, "Selected value: %.2f", (float)cos((float)index*step));
626             }
627 
628             /* column chart */
629             nk_layout_row_dynamic(ctx, 100, 1);
630             bounds = nk_widget_bounds(ctx);
631             if (nk_chart_begin(ctx, NK_CHART_COLUMN, 32, 0.0f, 1.0f)) {
632                 for (i = 0; i < 32; ++i) {
633                     nk_flags res = nk_chart_push(ctx, (float)fabs(sin(id)));
634                     if (res & NK_CHART_HOVERING)
635                         index = (int)i;
636                     if (res & NK_CHART_CLICKED)
637                         col_index = (int)i;
638                     id += step;
639                 }
640                 nk_chart_end(ctx);
641             }
642             if (index != -1)
643                 nk_tooltipf(ctx, "Value: %.2f", (float)fabs(sin(step * (float)index)));
644             if (col_index != -1) {
645                 nk_layout_row_dynamic(ctx, 20, 1);
646                 nk_labelf(ctx, NK_TEXT_LEFT, "Selected value: %.2f", (float)fabs(sin(step * (float)col_index)));
647             }
648 
649             /* mixed chart */
650             nk_layout_row_dynamic(ctx, 100, 1);
651             bounds = nk_widget_bounds(ctx);
652             if (nk_chart_begin(ctx, NK_CHART_COLUMN, 32, 0.0f, 1.0f)) {
653                 nk_chart_add_slot(ctx, NK_CHART_LINES, 32, -1.0f, 1.0f);
654                 nk_chart_add_slot(ctx, NK_CHART_LINES, 32, -1.0f, 1.0f);
655                 for (id = 0, i = 0; i < 32; ++i) {
656                     nk_chart_push_slot(ctx, (float)fabs(sin(id)), 0);
657                     nk_chart_push_slot(ctx, (float)cos(id), 1);
658                     nk_chart_push_slot(ctx, (float)sin(id), 2);
659                     id += step;
660                 }
661             }
662             nk_chart_end(ctx);
663 
664             /* mixed colored chart */
665             nk_layout_row_dynamic(ctx, 100, 1);
666             bounds = nk_widget_bounds(ctx);
667             if (nk_chart_begin_colored(ctx, NK_CHART_LINES, nk_rgb(255,0,0), nk_rgb(150,0,0), 32, 0.0f, 1.0f)) {
668                 nk_chart_add_slot_colored(ctx, NK_CHART_LINES, nk_rgb(0,0,255), nk_rgb(0,0,150),32, -1.0f, 1.0f);
669                 nk_chart_add_slot_colored(ctx, NK_CHART_LINES, nk_rgb(0,255,0), nk_rgb(0,150,0), 32, -1.0f, 1.0f);
670                 for (id = 0, i = 0; i < 32; ++i) {
671                     nk_chart_push_slot(ctx, (float)fabs(sin(id)), 0);
672                     nk_chart_push_slot(ctx, (float)cos(id), 1);
673                     nk_chart_push_slot(ctx, (float)sin(id), 2);
674                     id += step;
675                 }
676             }
677             nk_chart_end(ctx);
678             nk_tree_pop(ctx);
679         }
680 
681         if (nk_tree_push(ctx, NK_TREE_TAB, "Popup", NK_MINIMIZED))
682         {
683             static struct nk_color color = {255,0,0, 255};
684             static int select[4];
685             static int popup_active;
686             const struct nk_input *in = &ctx->input;
687             struct nk_rect bounds;
688 
689             /* menu contextual */
690             nk_layout_row_static(ctx, 30, 160, 1);
691             bounds = nk_widget_bounds(ctx);
692             nk_label(ctx, "Right click me for menu", NK_TEXT_LEFT);
693 
694             if (nk_contextual_begin(ctx, 0, nk_vec2(100, 300), bounds)) {
695                 static size_t prog = 40;
696                 static int slider = 10;
697 
698                 nk_layout_row_dynamic(ctx, 25, 1);
699                 nk_checkbox_label(ctx, "Menu", &show_menu);
700                 nk_progress(ctx, &prog, 100, NK_MODIFIABLE);
701                 nk_slider_int(ctx, 0, &slider, 16, 1);
702                 if (nk_contextual_item_label(ctx, "About", NK_TEXT_CENTERED))
703                     show_app_about = nk_true;
704                 nk_selectable_label(ctx, select[0]?"Unselect":"Select", NK_TEXT_LEFT, &select[0]);
705                 nk_selectable_label(ctx, select[1]?"Unselect":"Select", NK_TEXT_LEFT, &select[1]);
706                 nk_selectable_label(ctx, select[2]?"Unselect":"Select", NK_TEXT_LEFT, &select[2]);
707                 nk_selectable_label(ctx, select[3]?"Unselect":"Select", NK_TEXT_LEFT, &select[3]);
708                 nk_contextual_end(ctx);
709             }
710 
711             /* color contextual */
712             nk_layout_row_begin(ctx, NK_STATIC, 30, 2);
713             nk_layout_row_push(ctx, 100);
714             nk_label(ctx, "Right Click here:", NK_TEXT_LEFT);
715             nk_layout_row_push(ctx, 50);
716             bounds = nk_widget_bounds(ctx);
717             nk_button_color(ctx, color);
718             nk_layout_row_end(ctx);
719 
720             if (nk_contextual_begin(ctx, 0, nk_vec2(350, 60), bounds)) {
721                 nk_layout_row_dynamic(ctx, 30, 4);
722                 color.r = (nk_byte)nk_propertyi(ctx, "#r", 0, color.r, 255, 1, 1);
723                 color.g = (nk_byte)nk_propertyi(ctx, "#g", 0, color.g, 255, 1, 1);
724                 color.b = (nk_byte)nk_propertyi(ctx, "#b", 0, color.b, 255, 1, 1);
725                 color.a = (nk_byte)nk_propertyi(ctx, "#a", 0, color.a, 255, 1, 1);
726                 nk_contextual_end(ctx);
727             }
728 
729             /* popup */
730             nk_layout_row_begin(ctx, NK_STATIC, 30, 2);
731             nk_layout_row_push(ctx, 100);
732             nk_label(ctx, "Popup:", NK_TEXT_LEFT);
733             nk_layout_row_push(ctx, 50);
734             if (nk_button_label(ctx, "Popup"))
735                 popup_active = 1;
736             nk_layout_row_end(ctx);
737 
738             if (popup_active)
739             {
740                 static struct nk_rect s = {20, 100, 220, 90};
741                 if (nk_popup_begin(ctx, NK_POPUP_STATIC, "Error", 0, s))
742                 {
743                     nk_layout_row_dynamic(ctx, 25, 1);
744                     nk_label(ctx, "A terrible error as occured", NK_TEXT_LEFT);
745                     nk_layout_row_dynamic(ctx, 25, 2);
746                     if (nk_button_label(ctx, "OK")) {
747                         popup_active = 0;
748                         nk_popup_close(ctx);
749                     }
750                     if (nk_button_label(ctx, "Cancel")) {
751                         popup_active = 0;
752                         nk_popup_close(ctx);
753                     }
754                     nk_popup_end(ctx);
755                 } else popup_active = nk_false;
756             }
757 
758             /* tooltip */
759             nk_layout_row_static(ctx, 30, 150, 1);
760             bounds = nk_widget_bounds(ctx);
761             nk_label(ctx, "Hover me for tooltip", NK_TEXT_LEFT);
762             if (nk_input_is_mouse_hovering_rect(in, bounds))
763                 nk_tooltip(ctx, "This is a tooltip");
764 
765             nk_tree_pop(ctx);
766         }
767 
768         if (nk_tree_push(ctx, NK_TREE_TAB, "Layout", NK_MINIMIZED))
769         {
770             if (nk_tree_push(ctx, NK_TREE_NODE, "Widget", NK_MINIMIZED))
771             {
772                 float ratio_two[] = {0.2f, 0.6f, 0.2f};
773                 float width_two[] = {100, 200, 50};
774 
775                 nk_layout_row_dynamic(ctx, 30, 1);
776                 nk_label(ctx, "Dynamic fixed column layout with generated position and size:", NK_TEXT_LEFT);
777                 nk_layout_row_dynamic(ctx, 30, 3);
778                 nk_button_label(ctx, "button");
779                 nk_button_label(ctx, "button");
780                 nk_button_label(ctx, "button");
781 
782                 nk_layout_row_dynamic(ctx, 30, 1);
783                 nk_label(ctx, "static fixed column layout with generated position and size:", NK_TEXT_LEFT);
784                 nk_layout_row_static(ctx, 30, 100, 3);
785                 nk_button_label(ctx, "button");
786                 nk_button_label(ctx, "button");
787                 nk_button_label(ctx, "button");
788 
789                 nk_layout_row_dynamic(ctx, 30, 1);
790                 nk_label(ctx, "Dynamic array-based custom column layout with generated position and custom size:",NK_TEXT_LEFT);
791                 nk_layout_row(ctx, NK_DYNAMIC, 30, 3, ratio_two);
792                 nk_button_label(ctx, "button");
793                 nk_button_label(ctx, "button");
794                 nk_button_label(ctx, "button");
795 
796                 nk_layout_row_dynamic(ctx, 30, 1);
797                 nk_label(ctx, "Static array-based custom column layout with generated position and custom size:",NK_TEXT_LEFT );
798                 nk_layout_row(ctx, NK_STATIC, 30, 3, width_two);
799                 nk_button_label(ctx, "button");
800                 nk_button_label(ctx, "button");
801                 nk_button_label(ctx, "button");
802 
803                 nk_layout_row_dynamic(ctx, 30, 1);
804                 nk_label(ctx, "Dynamic immediate mode custom column layout with generated position and custom size:",NK_TEXT_LEFT);
805                 nk_layout_row_begin(ctx, NK_DYNAMIC, 30, 3);
806                 nk_layout_row_push(ctx, 0.2f);
807                 nk_button_label(ctx, "button");
808                 nk_layout_row_push(ctx, 0.6f);
809                 nk_button_label(ctx, "button");
810                 nk_layout_row_push(ctx, 0.2f);
811                 nk_button_label(ctx, "button");
812                 nk_layout_row_end(ctx);
813 
814                 nk_layout_row_dynamic(ctx, 30, 1);
815                 nk_label(ctx, "Static immediate mode custom column layout with generated position and custom size:", NK_TEXT_LEFT);
816                 nk_layout_row_begin(ctx, NK_STATIC, 30, 3);
817                 nk_layout_row_push(ctx, 100);
818                 nk_button_label(ctx, "button");
819                 nk_layout_row_push(ctx, 200);
820                 nk_button_label(ctx, "button");
821                 nk_layout_row_push(ctx, 50);
822                 nk_button_label(ctx, "button");
823                 nk_layout_row_end(ctx);
824 
825                 nk_layout_row_dynamic(ctx, 30, 1);
826                 nk_label(ctx, "Static free space with custom position and custom size:", NK_TEXT_LEFT);
827                 nk_layout_space_begin(ctx, NK_STATIC, 60, 4);
828                 nk_layout_space_push(ctx, nk_rect(100, 0, 100, 30));
829                 nk_button_label(ctx, "button");
830                 nk_layout_space_push(ctx, nk_rect(0, 15, 100, 30));
831                 nk_button_label(ctx, "button");
832                 nk_layout_space_push(ctx, nk_rect(200, 15, 100, 30));
833                 nk_button_label(ctx, "button");
834                 nk_layout_space_push(ctx, nk_rect(100, 30, 100, 30));
835                 nk_button_label(ctx, "button");
836                 nk_layout_space_end(ctx);
837 
838                 nk_layout_row_dynamic(ctx, 30, 1);
839                 nk_label(ctx, "Row template:", NK_TEXT_LEFT);
840                 nk_layout_row_template_begin(ctx, 30);
841                 nk_layout_row_template_push_dynamic(ctx);
842                 nk_layout_row_template_push_variable(ctx, 80);
843                 nk_layout_row_template_push_static(ctx, 80);
844                 nk_layout_row_template_end(ctx);
845                 nk_button_label(ctx, "button");
846                 nk_button_label(ctx, "button");
847                 nk_button_label(ctx, "button");
848 
849                 nk_tree_pop(ctx);
850             }
851 
852             if (nk_tree_push(ctx, NK_TREE_NODE, "Group", NK_MINIMIZED))
853             {
854                 static int group_titlebar = nk_false;
855                 static int group_border = nk_true;
856                 static int group_no_scrollbar = nk_false;
857                 static int group_width = 320;
858                 static int group_height = 200;
859 
860                 nk_flags group_flags = 0;
861                 if (group_border) group_flags |= NK_WINDOW_BORDER;
862                 if (group_no_scrollbar) group_flags |= NK_WINDOW_NO_SCROLLBAR;
863                 if (group_titlebar) group_flags |= NK_WINDOW_TITLE;
864 
865                 nk_layout_row_dynamic(ctx, 30, 3);
866                 nk_checkbox_label(ctx, "Titlebar", &group_titlebar);
867                 nk_checkbox_label(ctx, "Border", &group_border);
868                 nk_checkbox_label(ctx, "No Scrollbar", &group_no_scrollbar);
869 
870                 nk_layout_row_begin(ctx, NK_STATIC, 22, 3);
871                 nk_layout_row_push(ctx, 50);
872                 nk_label(ctx, "size:", NK_TEXT_LEFT);
873                 nk_layout_row_push(ctx, 130);
874                 nk_property_int(ctx, "#Width:", 100, &group_width, 500, 10, 1);
875                 nk_layout_row_push(ctx, 130);
876                 nk_property_int(ctx, "#Height:", 100, &group_height, 500, 10, 1);
877                 nk_layout_row_end(ctx);
878 
879                 nk_layout_row_static(ctx, (float)group_height, group_width, 2);
880                 if (nk_group_begin(ctx, "Group", group_flags)) {
881                     int i = 0;
882                     static int selected[16];
883                     nk_layout_row_static(ctx, 18, 100, 1);
884                     for (i = 0; i < 16; ++i)
885                         nk_selectable_label(ctx, (selected[i]) ? "Selected": "Unselected", NK_TEXT_CENTERED, &selected[i]);
886                     nk_group_end(ctx);
887                 }
888                 nk_tree_pop(ctx);
889             }
890 
891             if (nk_tree_push(ctx, NK_TREE_NODE, "Notebook", NK_MINIMIZED))
892             {
893                 static int current_tab = 0;
894                 struct nk_rect bounds;
895                 float step = (2*3.141592654f) / 32;
896                 enum chart_type {CHART_LINE, CHART_HISTO, CHART_MIXED};
897                 const char *names[] = {"Lines", "Columns", "Mixed"};
898                 float id = 0;
899                 int i;
900 
901                 /* Header */
902                 nk_style_push_vec2(ctx, &ctx->style.window.spacing, nk_vec2(0,0));
903                 nk_style_push_float(ctx, &ctx->style.button.rounding, 0);
904                 nk_layout_row_begin(ctx, NK_STATIC, 20, 3);
905                 for (i = 0; i < 3; ++i) {
906                     /* make sure button perfectly fits text */
907                     const struct nk_user_font *f = ctx->style.font;
908                     float text_width = f->width(f->userdata, f->height, names[i], nk_strlen(names[i]));
909                     float widget_width = text_width + 3 * ctx->style.button.padding.x;
910                     nk_layout_row_push(ctx, widget_width);
911                     if (current_tab == i) {
912                         /* active tab gets highlighted */
913                         struct nk_style_item button_color = ctx->style.button.normal;
914                         ctx->style.button.normal = ctx->style.button.active;
915                         current_tab = nk_button_label(ctx, names[i]) ? i: current_tab;
916                         ctx->style.button.normal = button_color;
917                     } else current_tab = nk_button_label(ctx, names[i]) ? i: current_tab;
918                 }
919                 nk_style_pop_float(ctx);
920 
921                 /* Body */
922                 nk_layout_row_dynamic(ctx, 140, 1);
923                 if (nk_group_begin(ctx, "Notebook", NK_WINDOW_BORDER))
924                 {
925                     nk_style_pop_vec2(ctx);
926                     switch (current_tab) {
927                     default: break;
928                     case CHART_LINE:
929                         nk_layout_row_dynamic(ctx, 100, 1);
930                         bounds = nk_widget_bounds(ctx);
931                         if (nk_chart_begin_colored(ctx, NK_CHART_LINES, nk_rgb(255,0,0), nk_rgb(150,0,0), 32, 0.0f, 1.0f)) {
932                             nk_chart_add_slot_colored(ctx, NK_CHART_LINES, nk_rgb(0,0,255), nk_rgb(0,0,150),32, -1.0f, 1.0f);
933                             for (i = 0, id = 0; i < 32; ++i) {
934                                 nk_chart_push_slot(ctx, (float)fabs(sin(id)), 0);
935                                 nk_chart_push_slot(ctx, (float)cos(id), 1);
936                                 id += step;
937                             }
938                         }
939                         nk_chart_end(ctx);
940                         break;
941                     case CHART_HISTO:
942                         nk_layout_row_dynamic(ctx, 100, 1);
943                         bounds = nk_widget_bounds(ctx);
944                         if (nk_chart_begin_colored(ctx, NK_CHART_COLUMN, nk_rgb(255,0,0), nk_rgb(150,0,0), 32, 0.0f, 1.0f)) {
945                             for (i = 0, id = 0; i < 32; ++i) {
946                                 nk_chart_push_slot(ctx, (float)fabs(sin(id)), 0);
947                                 id += step;
948                             }
949                         }
950                         nk_chart_end(ctx);
951                         break;
952                     case CHART_MIXED:
953                         nk_layout_row_dynamic(ctx, 100, 1);
954                         bounds = nk_widget_bounds(ctx);
955                         if (nk_chart_begin_colored(ctx, NK_CHART_LINES, nk_rgb(255,0,0), nk_rgb(150,0,0), 32, 0.0f, 1.0f)) {
956                             nk_chart_add_slot_colored(ctx, NK_CHART_LINES, nk_rgb(0,0,255), nk_rgb(0,0,150),32, -1.0f, 1.0f);
957                             nk_chart_add_slot_colored(ctx, NK_CHART_COLUMN, nk_rgb(0,255,0), nk_rgb(0,150,0), 32, 0.0f, 1.0f);
958                             for (i = 0, id = 0; i < 32; ++i) {
959                                 nk_chart_push_slot(ctx, (float)fabs(sin(id)), 0);
960                                 nk_chart_push_slot(ctx, (float)fabs(cos(id)), 1);
961                                 nk_chart_push_slot(ctx, (float)fabs(sin(id)), 2);
962                                 id += step;
963                             }
964                         }
965                         nk_chart_end(ctx);
966                         break;
967                     }
968                     nk_group_end(ctx);
969                 } else nk_style_pop_vec2(ctx);
970                 nk_tree_pop(ctx);
971             }
972 
973             if (nk_tree_push(ctx, NK_TREE_NODE, "Simple", NK_MINIMIZED))
974             {
975                 nk_layout_row_dynamic(ctx, 300, 2);
976                 if (nk_group_begin(ctx, "Group_Without_Border", 0)) {
977                     int i = 0;
978                     char buffer[64];
979                     nk_layout_row_static(ctx, 18, 150, 1);
980                     for (i = 0; i < 64; ++i) {
981                         sprintf(buffer, "0x%02x", i);
982                         nk_labelf(ctx, NK_TEXT_LEFT, "%s: scrollable region", buffer);
983                     }
984                     nk_group_end(ctx);
985                 }
986                 if (nk_group_begin(ctx, "Group_With_Border", NK_WINDOW_BORDER)) {
987                     int i = 0;
988                     char buffer[64];
989                     nk_layout_row_dynamic(ctx, 25, 2);
990                     for (i = 0; i < 64; ++i) {
991                         sprintf(buffer, "%08d", ((((i%7)*10)^32))+(64+(i%2)*2));
992                         nk_button_label(ctx, buffer);
993                     }
994                     nk_group_end(ctx);
995                 }
996                 nk_tree_pop(ctx);
997             }
998 
999             if (nk_tree_push(ctx, NK_TREE_NODE, "Complex", NK_MINIMIZED))
1000             {
1001                 int i;
1002                 nk_layout_space_begin(ctx, NK_STATIC, 500, 64);
1003                 nk_layout_space_push(ctx, nk_rect(0,0,150,500));
1004                 if (nk_group_begin(ctx, "Group_left", NK_WINDOW_BORDER)) {
1005                     static int selected[32];
1006                     nk_layout_row_static(ctx, 18, 100, 1);
1007                     for (i = 0; i < 32; ++i)
1008                         nk_selectable_label(ctx, (selected[i]) ? "Selected": "Unselected", NK_TEXT_CENTERED, &selected[i]);
1009                     nk_group_end(ctx);
1010                 }
1011 
1012                 nk_layout_space_push(ctx, nk_rect(160,0,150,240));
1013                 if (nk_group_begin(ctx, "Group_top", NK_WINDOW_BORDER)) {
1014                     nk_layout_row_dynamic(ctx, 25, 1);
1015                     nk_button_label(ctx, "#FFAA");
1016                     nk_button_label(ctx, "#FFBB");
1017                     nk_button_label(ctx, "#FFCC");
1018                     nk_button_label(ctx, "#FFDD");
1019                     nk_button_label(ctx, "#FFEE");
1020                     nk_button_label(ctx, "#FFFF");
1021                     nk_group_end(ctx);
1022                 }
1023 
1024                 nk_layout_space_push(ctx, nk_rect(160,250,150,250));
1025                 if (nk_group_begin(ctx, "Group_buttom", NK_WINDOW_BORDER)) {
1026                     nk_layout_row_dynamic(ctx, 25, 1);
1027                     nk_button_label(ctx, "#FFAA");
1028                     nk_button_label(ctx, "#FFBB");
1029                     nk_button_label(ctx, "#FFCC");
1030                     nk_button_label(ctx, "#FFDD");
1031                     nk_button_label(ctx, "#FFEE");
1032                     nk_button_label(ctx, "#FFFF");
1033                     nk_group_end(ctx);
1034                 }
1035 
1036                 nk_layout_space_push(ctx, nk_rect(320,0,150,150));
1037                 if (nk_group_begin(ctx, "Group_right_top", NK_WINDOW_BORDER)) {
1038                     static int selected[4];
1039                     nk_layout_row_static(ctx, 18, 100, 1);
1040                     for (i = 0; i < 4; ++i)
1041                         nk_selectable_label(ctx, (selected[i]) ? "Selected": "Unselected", NK_TEXT_CENTERED, &selected[i]);
1042                     nk_group_end(ctx);
1043                 }
1044 
1045                 nk_layout_space_push(ctx, nk_rect(320,160,150,150));
1046                 if (nk_group_begin(ctx, "Group_right_center", NK_WINDOW_BORDER)) {
1047                     static int selected[4];
1048                     nk_layout_row_static(ctx, 18, 100, 1);
1049                     for (i = 0; i < 4; ++i)
1050                         nk_selectable_label(ctx, (selected[i]) ? "Selected": "Unselected", NK_TEXT_CENTERED, &selected[i]);
1051                     nk_group_end(ctx);
1052                 }
1053 
1054                 nk_layout_space_push(ctx, nk_rect(320,320,150,150));
1055                 if (nk_group_begin(ctx, "Group_right_bottom", NK_WINDOW_BORDER)) {
1056                     static int selected[4];
1057                     nk_layout_row_static(ctx, 18, 100, 1);
1058                     for (i = 0; i < 4; ++i)
1059                         nk_selectable_label(ctx, (selected[i]) ? "Selected": "Unselected", NK_TEXT_CENTERED, &selected[i]);
1060                     nk_group_end(ctx);
1061                 }
1062                 nk_layout_space_end(ctx);
1063                 nk_tree_pop(ctx);
1064             }
1065 
1066             if (nk_tree_push(ctx, NK_TREE_NODE, "Splitter", NK_MINIMIZED))
1067             {
1068                 const struct nk_input *in = &ctx->input;
1069                 nk_layout_row_static(ctx, 20, 320, 1);
1070                 nk_label(ctx, "Use slider and spinner to change tile size", NK_TEXT_LEFT);
1071                 nk_label(ctx, "Drag the space between tiles to change tile ratio", NK_TEXT_LEFT);
1072 
1073                 if (nk_tree_push(ctx, NK_TREE_NODE, "Vertical", NK_MINIMIZED))
1074                 {
1075                     static float a = 100, b = 100, c = 100;
1076                     struct nk_rect bounds;
1077 
1078                     float row_layout[5];
1079                     row_layout[0] = a;
1080                     row_layout[1] = 8;
1081                     row_layout[2] = b;
1082                     row_layout[3] = 8;
1083                     row_layout[4] = c;
1084 
1085                     /* header */
1086                     nk_layout_row_static(ctx, 30, 100, 2);
1087                     nk_label(ctx, "left:", NK_TEXT_LEFT);
1088                     nk_slider_float(ctx, 10.0f, &a, 200.0f, 10.0f);
1089 
1090                     nk_label(ctx, "middle:", NK_TEXT_LEFT);
1091                     nk_slider_float(ctx, 10.0f, &b, 200.0f, 10.0f);
1092 
1093                     nk_label(ctx, "right:", NK_TEXT_LEFT);
1094                     nk_slider_float(ctx, 10.0f, &c, 200.0f, 10.0f);
1095 
1096                     /* tiles */
1097                     nk_layout_row(ctx, NK_STATIC, 200, 5, row_layout);
1098 
1099                     /* left space */
1100                     if (nk_group_begin(ctx, "left", NK_WINDOW_NO_SCROLLBAR|NK_WINDOW_BORDER|NK_WINDOW_NO_SCROLLBAR)) {
1101                         nk_layout_row_dynamic(ctx, 25, 1);
1102                         nk_button_label(ctx, "#FFAA");
1103                         nk_button_label(ctx, "#FFBB");
1104                         nk_button_label(ctx, "#FFCC");
1105                         nk_button_label(ctx, "#FFDD");
1106                         nk_button_label(ctx, "#FFEE");
1107                         nk_button_label(ctx, "#FFFF");
1108                         nk_group_end(ctx);
1109                     }
1110 
1111                     /* scaler */
1112                     bounds = nk_widget_bounds(ctx);
1113                     nk_spacing(ctx, 1);
1114                     if ((nk_input_is_mouse_hovering_rect(in, bounds) ||
1115                         nk_input_is_mouse_prev_hovering_rect(in, bounds)) &&
1116                         nk_input_is_mouse_down(in, NK_BUTTON_LEFT))
1117                     {
1118                         a = row_layout[0] + in->mouse.delta.x;
1119                         b = row_layout[2] - in->mouse.delta.x;
1120                     }
1121 
1122                     /* middle space */
1123                     if (nk_group_begin(ctx, "center", NK_WINDOW_BORDER|NK_WINDOW_NO_SCROLLBAR)) {
1124                         nk_layout_row_dynamic(ctx, 25, 1);
1125                         nk_button_label(ctx, "#FFAA");
1126                         nk_button_label(ctx, "#FFBB");
1127                         nk_button_label(ctx, "#FFCC");
1128                         nk_button_label(ctx, "#FFDD");
1129                         nk_button_label(ctx, "#FFEE");
1130                         nk_button_label(ctx, "#FFFF");
1131                         nk_group_end(ctx);
1132                     }
1133 
1134                     /* scaler */
1135                     bounds = nk_widget_bounds(ctx);
1136                     nk_spacing(ctx, 1);
1137                     if ((nk_input_is_mouse_hovering_rect(in, bounds) ||
1138                         nk_input_is_mouse_prev_hovering_rect(in, bounds)) &&
1139                         nk_input_is_mouse_down(in, NK_BUTTON_LEFT))
1140                     {
1141                         b = (row_layout[2] + in->mouse.delta.x);
1142                         c = (row_layout[4] - in->mouse.delta.x);
1143                     }
1144 
1145                     /* right space */
1146                     if (nk_group_begin(ctx, "right", NK_WINDOW_BORDER|NK_WINDOW_NO_SCROLLBAR)) {
1147                         nk_layout_row_dynamic(ctx, 25, 1);
1148                         nk_button_label(ctx, "#FFAA");
1149                         nk_button_label(ctx, "#FFBB");
1150                         nk_button_label(ctx, "#FFCC");
1151                         nk_button_label(ctx, "#FFDD");
1152                         nk_button_label(ctx, "#FFEE");
1153                         nk_button_label(ctx, "#FFFF");
1154                         nk_group_end(ctx);
1155                     }
1156 
1157                     nk_tree_pop(ctx);
1158                 }
1159 
1160                 if (nk_tree_push(ctx, NK_TREE_NODE, "Horizontal", NK_MINIMIZED))
1161                 {
1162                     static float a = 100, b = 100, c = 100;
1163                     struct nk_rect bounds;
1164 
1165                     /* header */
1166                     nk_layout_row_static(ctx, 30, 100, 2);
1167                     nk_label(ctx, "top:", NK_TEXT_LEFT);
1168                     nk_slider_float(ctx, 10.0f, &a, 200.0f, 10.0f);
1169 
1170                     nk_label(ctx, "middle:", NK_TEXT_LEFT);
1171                     nk_slider_float(ctx, 10.0f, &b, 200.0f, 10.0f);
1172 
1173                     nk_label(ctx, "bottom:", NK_TEXT_LEFT);
1174                     nk_slider_float(ctx, 10.0f, &c, 200.0f, 10.0f);
1175 
1176                     /* top space */
1177                     nk_layout_row_dynamic(ctx, a, 1);
1178                     if (nk_group_begin(ctx, "top", NK_WINDOW_NO_SCROLLBAR|NK_WINDOW_BORDER)) {
1179                         nk_layout_row_dynamic(ctx, 25, 3);
1180                         nk_button_label(ctx, "#FFAA");
1181                         nk_button_label(ctx, "#FFBB");
1182                         nk_button_label(ctx, "#FFCC");
1183                         nk_button_label(ctx, "#FFDD");
1184                         nk_button_label(ctx, "#FFEE");
1185                         nk_button_label(ctx, "#FFFF");
1186                         nk_group_end(ctx);
1187                     }
1188 
1189                     /* scaler */
1190                     nk_layout_row_dynamic(ctx, 8, 1);
1191                     bounds = nk_widget_bounds(ctx);
1192                     nk_spacing(ctx, 1);
1193                     if ((nk_input_is_mouse_hovering_rect(in, bounds) ||
1194                         nk_input_is_mouse_prev_hovering_rect(in, bounds)) &&
1195                         nk_input_is_mouse_down(in, NK_BUTTON_LEFT))
1196                     {
1197                         a = a + in->mouse.delta.y;
1198                         b = b - in->mouse.delta.y;
1199                     }
1200 
1201                     /* middle space */
1202                     nk_layout_row_dynamic(ctx, b, 1);
1203                     if (nk_group_begin(ctx, "middle", NK_WINDOW_NO_SCROLLBAR|NK_WINDOW_BORDER)) {
1204                         nk_layout_row_dynamic(ctx, 25, 3);
1205                         nk_button_label(ctx, "#FFAA");
1206                         nk_button_label(ctx, "#FFBB");
1207                         nk_button_label(ctx, "#FFCC");
1208                         nk_button_label(ctx, "#FFDD");
1209                         nk_button_label(ctx, "#FFEE");
1210                         nk_button_label(ctx, "#FFFF");
1211                         nk_group_end(ctx);
1212                     }
1213 
1214                     {
1215                         /* scaler */
1216                         nk_layout_row_dynamic(ctx, 8, 1);
1217                         bounds = nk_widget_bounds(ctx);
1218                         if ((nk_input_is_mouse_hovering_rect(in, bounds) ||
1219                             nk_input_is_mouse_prev_hovering_rect(in, bounds)) &&
1220                             nk_input_is_mouse_down(in, NK_BUTTON_LEFT))
1221                         {
1222                             b = b + in->mouse.delta.y;
1223                             c = c - in->mouse.delta.y;
1224                         }
1225                     }
1226 
1227                     /* bottom space */
1228                     nk_layout_row_dynamic(ctx, c, 1);
1229                     if (nk_group_begin(ctx, "bottom", NK_WINDOW_NO_SCROLLBAR|NK_WINDOW_BORDER)) {
1230                         nk_layout_row_dynamic(ctx, 25, 3);
1231                         nk_button_label(ctx, "#FFAA");
1232                         nk_button_label(ctx, "#FFBB");
1233                         nk_button_label(ctx, "#FFCC");
1234                         nk_button_label(ctx, "#FFDD");
1235                         nk_button_label(ctx, "#FFEE");
1236                         nk_button_label(ctx, "#FFFF");
1237                         nk_group_end(ctx);
1238                     }
1239                     nk_tree_pop(ctx);
1240                 }
1241                 nk_tree_pop(ctx);
1242             }
1243             nk_tree_pop(ctx);
1244         }
1245     }
1246     nk_end(ctx);
1247     return !nk_window_is_closed(ctx, "Overview");
1248 }
1249 
1250