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
|
/***********************************************************
* Copyright (C) 1997, Be Inc. Copyright (C) 1999, Jake Hamby.
*
* This program is freely distributable without licensing fees
* and is provided without guarantee or warrantee expressed or
* implied. This program is -not- in the public domain.
*
* FILE: glutMenu.cpp
*
* DESCRIPTION: code for popup menu handling
***********************************************************/
/***********************************************************
* Headers
***********************************************************/
#include <GL/glut.h>
#include <stdlib.h>
#include <string.h>
#include "glutint.h"
#include "glutState.h"
/***********************************************************
* Private variables
***********************************************************/
static GlutMenu **menuList = 0;
static int menuListSize = 0;
/***********************************************************
* FUNCTION: getUnusedMenuSlot
*
* DESCRIPTION: helper function to get a new menu slot
***********************************************************/
GlutMenu *__glutGetMenuByNum(int menunum)
{
if (menunum < 1 || menunum > menuListSize) {
return NULL;
}
return menuList[menunum - 1];
}
/***********************************************************
* FUNCTION: getUnusedMenuSlot
*
* DESCRIPTION: helper function to get a new menu slot
***********************************************************/
static int
getUnusedMenuSlot(void)
{
int i;
/* Look for allocated, unused slot. */
for (i = 0; i < menuListSize; i++) {
if (!menuList[i]) {
return i;
}
}
/* Allocate a new slot. */
menuListSize++;
menuList = (GlutMenu **)
realloc(menuList, menuListSize * sizeof(GlutMenu *));
if (!menuList)
__glutFatalError("out of memory.");
menuList[menuListSize - 1] = NULL;
return menuListSize - 1;
}
/***********************************************************
* FUNCTION: glutCreateMenu (6.1)
*
* DESCRIPTION: create a new menu
***********************************************************/
int APIENTRY
glutCreateMenu(GLUTselectCB selectFunc)
{
GlutMenu *menu;
int menuid;
menuid = getUnusedMenuSlot();
menu = new GlutMenu(menuid, selectFunc); // constructor sets up members
menuList[menuid] = menu;
gState.currentMenu = menu;
return menuid + 1;
}
/***********************************************************
* FUNCTION: glutSetMenu (6.2)
* glutGetMenu
*
* DESCRIPTION: set and get the current menu
***********************************************************/
int APIENTRY
glutGetMenu(void)
{
if (gState.currentMenu) {
return gState.currentMenu->id + 1;
} else {
return 0;
}
}
void APIENTRY
glutSetMenu(int menuid)
{
GlutMenu *menu;
if (menuid < 1 || menuid > menuListSize) {
__glutWarning("glutSetMenu attempted on bogus menu.");
return;
}
menu = menuList[menuid - 1];
if (!menu) {
__glutWarning("glutSetMenu attempted on bogus menu.");
return;
}
gState.currentMenu = menu;
}
/***********************************************************
* FUNCTION: glutDestroyMenu (6.3)
*
* DESCRIPTION: destroy the specified menu
***********************************************************/
void APIENTRY
glutDestroyMenu(int menunum)
{
GlutMenu *menu = __glutGetMenuByNum(menunum);
menuList[menunum - 1] = 0;
if (gState.currentMenu == menu) {
gState.currentMenu = 0;
}
delete menu;
}
/***********************************************************
* FUNCTION: glutAddMenuEntry (6.4)
*
* DESCRIPTION: add a new menu item
***********************************************************/
void
glutAddMenuEntry(const char *label, int value)
{
new GlutMenuItem(gState.currentMenu, false, value, label);
}
/***********************************************************
* FUNCTION: glutAddSubMenu (6.5)
*
* DESCRIPTION: add a new submenu
***********************************************************/
void
glutAddSubMenu(const char *label, int menu)
{
new GlutMenuItem(gState.currentMenu, true, menu-1, label);
}
/***********************************************************
* FUNCTION: glutChangeToMenuEntry (6.6)
*
* DESCRIPTION: change menuitem into a menu entry
***********************************************************/
void
glutChangeToMenuEntry(int num, const char *label, int value)
{
GlutMenuItem *item;
int i;
i = gState.currentMenu->num;
item = gState.currentMenu->list;
while (item) {
if (i == num) {
free(item->label);
item->label = strdup(label);
item->isTrigger = false;
item->value = value;
return;
}
i--;
item = item->next;
}
__glutWarning("Current menu has no %d item.", num);
}
/***********************************************************
* FUNCTION: glutChangeToSubMenu (6.7)
*
* DESCRIPTION: change menuitem into a submenu
***********************************************************/
void
glutChangeToSubMenu(int num, const char *label, int menu)
{
GlutMenuItem *item;
int i;
i = gState.currentMenu->num;
item = gState.currentMenu->list;
while (item) {
if (i == num) {
free(item->label);
item->label = strdup(label);
item->isTrigger = true;
item->value = menu-1;
return;
}
i--;
item = item->next;
}
__glutWarning("Current menu has no %d item.", num);
}
/***********************************************************
* FUNCTION: glutRemoveMenuItem (6.8)
*
* DESCRIPTION: remove a menu item
***********************************************************/
void
glutRemoveMenuItem(int num)
{
GlutMenuItem *item, **prev;
int i;
i = gState.currentMenu->num;
prev = &gState.currentMenu->list;
item = gState.currentMenu->list;
while (item) {
if (i == num) {
gState.currentMenu->num--;
/* Patch up menu's item list. */
*prev = item->next;
free(item->label);
delete item;
return;
}
i--;
prev = &item->next;
item = item->next;
}
__glutWarning("Current menu has no %d item.", num);
}
/***********************************************************
* FUNCTION: glutAttachMenu (6.9)
* glutDetachMenu
*
* DESCRIPTION: attach and detach menu from view
***********************************************************/
void
glutAttachMenu(int button)
{
gState.currentWindow->menu[button] = gState.currentMenu->id + 1;
}
void
glutDetachMenu(int button)
{
gState.currentWindow->menu[button] = 0;
}
/***********************************************************
* CLASS: GlutMenu
*
* FUNCTION: CreateBMenu
*
* DESCRIPTION: construct a BPopupMenu for this menu
***********************************************************/
BMenu *GlutMenu::CreateBMenu(bool toplevel) {
BMenu *bpopup;
if(toplevel) {
bpopup = new GlutPopUp(id+1);
} else {
bpopup = new BMenu("");
}
GlutMenuItem *item = list;
while (item) {
GlutBMenuItem *bitem;
if(item->isTrigger) {
// recursively call CreateBMenu
bitem = new GlutBMenuItem(menuList[item->value]->CreateBMenu(false));
bitem->SetLabel(item->label);
bitem->menu = 0; // real menu items start at 1
bitem->value = 0;
} else {
bitem = new GlutBMenuItem(item->label);
bitem->menu = id + 1;
bitem->value = item->value;
}
bpopup->AddItem(bitem, 0);
item = item->next;
}
return bpopup;
}
/***********************************************************
* CLASS: GlutMenu
*
* FUNCTION: (destructor)
*
* DESCRIPTION: destroy the menu and its items (but not submenus!)
***********************************************************/
GlutMenu::~GlutMenu() {
while (list) {
GlutMenuItem *next = list->next;
delete list;
list = next;
}
}
/***********************************************************
* CLASS: GlutMenuItem
*
* FUNCTION: (constructor)
*
* DESCRIPTION: construct the new menu item and add to parent
***********************************************************/
GlutMenuItem::GlutMenuItem(GlutMenu *n_menu, bool n_trig, int n_value, const char *n_label)
{
menu = n_menu;
isTrigger = n_trig;
value = n_value;
label = strdup(n_label);
next = menu->list;
menu->list = this;
menu->num++;
}
|
