menuhit.c (7278B)
1 #include <u.h> 2 #include <libc.h> 3 #include <draw.h> 4 #include <thread.h> 5 #include <mouse.h> 6 7 enum 8 { 9 Margin = 4, /* outside to text */ 10 Border = 2, /* outside to selection boxes */ 11 Blackborder = 2, /* width of outlining border */ 12 Vspacing = 2, /* extra spacing between lines of text */ 13 Maxunscroll = 25, /* maximum #entries before scrolling turns on */ 14 Nscroll = 20, /* number entries in scrolling part */ 15 Scrollwid = 14, /* width of scroll bar */ 16 Gap = 4 /* between text and scroll bar */ 17 }; 18 19 static Image *menutxt; 20 static Image *back; 21 static Image *high; 22 static Image *bord; 23 static Image *text; 24 static Image *htext; 25 26 static 27 void 28 menucolors(void) 29 { 30 /* Main tone is greenish, with negative selection */ 31 back = allocimagemix(display, DPalegreen, DWhite); 32 high = allocimage(display, Rect(0,0,1,1), screen->chan, 1, DDarkgreen); /* dark green */ 33 bord = allocimage(display, Rect(0,0,1,1), screen->chan, 1, DMedgreen); /* not as dark green */ 34 if(back==nil || high==nil || bord==nil) 35 goto Error; 36 text = display->black; 37 htext = back; 38 return; 39 40 Error: 41 freeimage(back); 42 freeimage(high); 43 freeimage(bord); 44 back = display->white; 45 high = display->black; 46 bord = display->black; 47 text = display->black; 48 htext = display->white; 49 } 50 51 /* 52 * r is a rectangle holding the text elements. 53 * return the rectangle, including its black edge, holding element i. 54 */ 55 static Rectangle 56 menurect(Rectangle r, int i) 57 { 58 if(i < 0) 59 return Rect(0, 0, 0, 0); 60 r.min.y += (font->height+Vspacing)*i; 61 r.max.y = r.min.y+font->height+Vspacing; 62 return insetrect(r, Border-Margin); 63 } 64 65 /* 66 * r is a rectangle holding the text elements. 67 * return the element number containing p. 68 */ 69 static int 70 menusel(Rectangle r, Point p) 71 { 72 r = insetrect(r, Margin); 73 if(!ptinrect(p, r)) 74 return -1; 75 return (p.y-r.min.y)/(font->height+Vspacing); 76 } 77 78 static 79 void 80 paintitem(Image *m, Menu *menu, Rectangle textr, int off, int i, int highlight, Image *save, Image *restore) 81 { 82 char *item; 83 Rectangle r; 84 Point pt; 85 86 if(i < 0) 87 return; 88 r = menurect(textr, i); 89 if(restore){ 90 draw(m, r, restore, nil, restore->r.min); 91 return; 92 } 93 if(save) 94 draw(save, save->r, m, nil, r.min); 95 item = menu->item? menu->item[i+off] : (*menu->gen)(i+off); 96 pt.x = (textr.min.x+textr.max.x-stringwidth(font, item))/2; 97 pt.y = textr.min.y+i*(font->height+Vspacing); 98 draw(m, r, highlight? high : back, nil, pt); 99 string(m, pt, highlight? htext : text, pt, font, item); 100 } 101 102 /* 103 * menur is a rectangle holding all the highlightable text elements. 104 * track mouse while inside the box, return what's selected when button 105 * is raised, -1 as soon as it leaves box. 106 * invariant: nothing is highlighted on entry or exit. 107 */ 108 static int 109 menuscan(Image *m, Menu *menu, int but, Mousectl *mc, Rectangle textr, int off, int lasti, Image *save) 110 { 111 int i; 112 113 paintitem(m, menu, textr, off, lasti, 1, save, nil); 114 for(readmouse(mc); mc->m.buttons & (1<<(but-1)); readmouse(mc)){ 115 i = menusel(textr, mc->m.xy); 116 if(i != -1 && i == lasti) 117 continue; 118 paintitem(m, menu, textr, off, lasti, 0, nil, save); 119 if(i == -1) 120 return i; 121 lasti = i; 122 paintitem(m, menu, textr, off, lasti, 1, save, nil); 123 } 124 return lasti; 125 } 126 127 static void 128 menupaint(Image *m, Menu *menu, Rectangle textr, int off, int nitemdrawn) 129 { 130 int i; 131 132 draw(m, insetrect(textr, Border-Margin), back, nil, ZP); 133 for(i = 0; i<nitemdrawn; i++) 134 paintitem(m, menu, textr, off, i, 0, nil, nil); 135 } 136 137 static void 138 menuscrollpaint(Image *m, Rectangle scrollr, int off, int nitem, int nitemdrawn) 139 { 140 Rectangle r; 141 142 draw(m, scrollr, back, nil, ZP); 143 r.min.x = scrollr.min.x; 144 r.max.x = scrollr.max.x; 145 r.min.y = scrollr.min.y + (Dy(scrollr)*off)/nitem; 146 r.max.y = scrollr.min.y + (Dy(scrollr)*(off+nitemdrawn))/nitem; 147 if(r.max.y < r.min.y+2) 148 r.max.y = r.min.y+2; 149 border(m, r, 1, bord, ZP); 150 if(menutxt == 0) 151 menutxt = allocimage(display, Rect(0, 0, 1, 1), screen->chan, 1, DDarkgreen); /* border color; BUG? */ 152 if(menutxt) 153 draw(m, insetrect(r, 1), menutxt, nil, ZP); 154 } 155 156 int 157 menuhit(int but, Mousectl *mc, Menu *menu, Screen *scr) 158 { 159 int i, nitem, nitemdrawn, maxwid, lasti, off, noff, wid, screenitem; 160 int scrolling; 161 Rectangle r, menur, sc, textr, scrollr; 162 Image *b, *save, *backup; 163 Point pt; 164 char *item; 165 166 if(back == nil) 167 menucolors(); 168 sc = screen->clipr; 169 replclipr(screen, 0, screen->r); 170 maxwid = 0; 171 for(nitem = 0; 172 item = menu->item? menu->item[nitem] : (*menu->gen)(nitem); 173 nitem++){ 174 i = stringwidth(font, item); 175 if(i > maxwid) 176 maxwid = i; 177 } 178 if(menu->lasthit<0 || menu->lasthit>=nitem) 179 menu->lasthit = 0; 180 screenitem = (Dy(screen->r)-10)/(font->height+Vspacing); 181 if(nitem>Maxunscroll || nitem>screenitem){ 182 scrolling = 1; 183 nitemdrawn = Nscroll; 184 if(nitemdrawn > screenitem) 185 nitemdrawn = screenitem; 186 wid = maxwid + Gap + Scrollwid; 187 off = menu->lasthit - nitemdrawn/2; 188 if(off < 0) 189 off = 0; 190 if(off > nitem-nitemdrawn) 191 off = nitem-nitemdrawn; 192 lasti = menu->lasthit-off; 193 }else{ 194 scrolling = 0; 195 nitemdrawn = nitem; 196 wid = maxwid; 197 off = 0; 198 lasti = menu->lasthit; 199 } 200 r = insetrect(Rect(0, 0, wid, nitemdrawn*(font->height+Vspacing)), -Margin); 201 r = rectsubpt(r, Pt(wid/2, lasti*(font->height+Vspacing)+font->height/2)); 202 r = rectaddpt(r, mc->m.xy); 203 pt = ZP; 204 if(r.max.x>screen->r.max.x) 205 pt.x = screen->r.max.x-r.max.x; 206 if(r.max.y>screen->r.max.y) 207 pt.y = screen->r.max.y-r.max.y; 208 if(r.min.x<screen->r.min.x) 209 pt.x = screen->r.min.x-r.min.x; 210 if(r.min.y<screen->r.min.y) 211 pt.y = screen->r.min.y-r.min.y; 212 menur = rectaddpt(r, pt); 213 textr.max.x = menur.max.x-Margin; 214 textr.min.x = textr.max.x-maxwid; 215 textr.min.y = menur.min.y+Margin; 216 textr.max.y = textr.min.y + nitemdrawn*(font->height+Vspacing); 217 if(scrolling){ 218 scrollr = insetrect(menur, Border); 219 scrollr.max.x = scrollr.min.x+Scrollwid; 220 }else 221 scrollr = Rect(0, 0, 0, 0); 222 223 if(scr){ 224 b = allocwindow(scr, menur, Refbackup, DWhite); 225 if(b == nil) 226 b = screen; 227 backup = nil; 228 }else{ 229 b = screen; 230 backup = allocimage(display, menur, screen->chan, 0, -1); 231 if(backup) 232 draw(backup, menur, screen, nil, menur.min); 233 } 234 draw(b, menur, back, nil, ZP); 235 border(b, menur, Blackborder, bord, ZP); 236 save = allocimage(display, menurect(textr, 0), screen->chan, 0, -1); 237 r = menurect(textr, lasti); 238 moveto(mc, divpt(addpt(r.min, r.max), 2)); 239 menupaint(b, menu, textr, off, nitemdrawn); 240 if(scrolling) 241 menuscrollpaint(b, scrollr, off, nitem, nitemdrawn); 242 while(mc->m.buttons & (1<<(but-1))){ 243 lasti = menuscan(b, menu, but, mc, textr, off, lasti, save); 244 if(lasti >= 0) 245 break; 246 while(!ptinrect(mc->m.xy, textr) && (mc->m.buttons & (1<<(but-1)))){ 247 if(scrolling && ptinrect(mc->m.xy, scrollr)){ 248 noff = ((mc->m.xy.y-scrollr.min.y)*nitem)/Dy(scrollr); 249 noff -= nitemdrawn/2; 250 if(noff < 0) 251 noff = 0; 252 if(noff > nitem-nitemdrawn) 253 noff = nitem-nitemdrawn; 254 if(noff != off){ 255 off = noff; 256 menupaint(b, menu, textr, off, nitemdrawn); 257 menuscrollpaint(b, scrollr, off, nitem, nitemdrawn); 258 } 259 } 260 readmouse(mc); 261 } 262 } 263 if(b != screen) 264 freeimage(b); 265 if(backup){ 266 draw(screen, menur, backup, nil, menur.min); 267 freeimage(backup); 268 } 269 freeimage(save); 270 replclipr(screen, 0, sc); 271 flushimage(display, 1); 272 if(lasti >= 0){ 273 menu->lasthit = lasti+off; 274 return menu->lasthit; 275 } 276 return -1; 277 }