libgo/go/exp/nacl/av/event.go

   1 // Copyright 2009 The Go Authors.  All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 // NaCl GUI events.
   6 // Clients do not have raw access to the event stream
   7 // (only filtered through the lens of package draw)
   8 // but perhaps they will.
   9
  10 package av
  11
  12 import (
  13         "encoding/binary"
  14         "exp/draw"
  15         "image"
  16         "log"
  17         "os"
  18         "time"
  19 )
  20
  21 // An eventType identifies the type of a Native Client Event.
  22 type eventType uint8
  23
  24 const (
  25         eventActive = 1 + iota
  26         eventExpose
  27         eventKeyDown
  28         eventKeyUp
  29         eventMouseMotion
  30         eventMouseButtonDown
  31         eventMouseButtonUp
  32         eventQuit
  33         eventUnsupported
  34 )
  35
  36 // A key represents a key on a keyboard.
  37 type key uint16
  38
  39 const (
  40         keyUnknown      = 0
  41         keyFirst        = 0
  42         keyBackspace    = 8
  43         keyTab          = 9
  44         keyClear        = 12
  45         keyReturn       = 13
  46         keyPause        = 19
  47         keyEscape       = 27
  48         keySpace        = 32
  49         keyExclaim      = 33
  50         keyQuotedbl     = 34
  51         keyHash         = 35
  52         keyDollar       = 36
  53         keyAmpersand    = 38
  54         keyQuote        = 39
  55         keyLeftparen    = 40
  56         keyRightparen   = 41
  57         keyAsterisk     = 42
  58         keyPlus         = 43
  59         keyComma        = 44
  60         keyMinus        = 45
  61         keyPeriod       = 46
  62         keySlash        = 47
  63         key0            = 48
  64         key1            = 49
  65         key2            = 50
  66         key3            = 51
  67         key4            = 52
  68         key5            = 53
  69         key6            = 54
  70         key7            = 55
  71         key8            = 56
  72         key9            = 57
  73         keyColon        = 58
  74         keySemicolon    = 59
  75         keyLess         = 60
  76         keyEquals       = 61
  77         keyGreater      = 62
  78         keyQuestion     = 63
  79         keyAt           = 64
  80         keyLeftbracket  = 91
  81         keyBackslash    = 92
  82         keyRightbracket = 93
  83         keyCaret        = 94
  84         keyUnderscore   = 95
  85         keyBackquote    = 96
  86         keyA            = 97
  87         keyB            = 98
  88         keyC            = 99
  89         keyD            = 100
  90         keyE            = 101
  91         keyF            = 102
  92         keyG            = 103
  93         keyH            = 104
  94         keyI            = 105
  95         keyJ            = 106
  96         keyK            = 107
  97         keyL            = 108
  98         keyM            = 109
  99         keyN            = 110
 100         keyO            = 111
 101         keyP            = 112
 102         keyQ            = 113
 103         keyR            = 114
 104         keyS            = 115
 105         keyT            = 116
 106         keyU            = 117
 107         keyV            = 118
 108         keyW            = 119
 109         keyX            = 120
 110         keyY            = 121
 111         keyZ            = 122
 112         keyDelete       = 127
 113         keyWorld0       = 160
 114         keyWorld1       = 161
 115         keyWorld2       = 162
 116         keyWorld3       = 163
 117         keyWorld4       = 164
 118         keyWorld5       = 165
 119         keyWorld6       = 166
 120         keyWorld7       = 167
 121         keyWorld8       = 168
 122         keyWorld9       = 169
 123         keyWorld10      = 170
 124         keyWorld11      = 171
 125         keyWorld12      = 172
 126         keyWorld13      = 173
 127         keyWorld14      = 174
 128         keyWorld15      = 175
 129         keyWorld16      = 176
 130         keyWorld17      = 177
 131         keyWorld18      = 178
 132         keyWorld19      = 179
 133         keyWorld20      = 180
 134         keyWorld21      = 181
 135         keyWorld22      = 182
 136         keyWorld23      = 183
 137         keyWorld24      = 184
 138         keyWorld25      = 185
 139         keyWorld26      = 186
 140         keyWorld27      = 187
 141         keyWorld28      = 188
 142         keyWorld29      = 189
 143         keyWorld30      = 190
 144         keyWorld31      = 191
 145         keyWorld32      = 192
 146         keyWorld33      = 193
 147         keyWorld34      = 194
 148         keyWorld35      = 195
 149         keyWorld36      = 196
 150         keyWorld37      = 197
 151         keyWorld38      = 198
 152         keyWorld39      = 199
 153         keyWorld40      = 200
 154         keyWorld41      = 201
 155         keyWorld42      = 202
 156         keyWorld43      = 203
 157         keyWorld44      = 204
 158         keyWorld45      = 205
 159         keyWorld46      = 206
 160         keyWorld47      = 207
 161         keyWorld48      = 208
 162         keyWorld49      = 209
 163         keyWorld50      = 210
 164         keyWorld51      = 211
 165         keyWorld52      = 212
 166         keyWorld53      = 213
 167         keyWorld54      = 214
 168         keyWorld55      = 215
 169         keyWorld56      = 216
 170         keyWorld57      = 217
 171         keyWorld58      = 218
 172         keyWorld59      = 219
 173         keyWorld60      = 220
 174         keyWorld61      = 221
 175         keyWorld62      = 222
 176         keyWorld63      = 223
 177         keyWorld64      = 224
 178         keyWorld65      = 225
 179         keyWorld66      = 226
 180         keyWorld67      = 227
 181         keyWorld68      = 228
 182         keyWorld69      = 229
 183         keyWorld70      = 230
 184         keyWorld71      = 231
 185         keyWorld72      = 232
 186         keyWorld73      = 233
 187         keyWorld74      = 234
 188         keyWorld75      = 235
 189         keyWorld76      = 236
 190         keyWorld77      = 237
 191         keyWorld78      = 238
 192         keyWorld79      = 239
 193         keyWorld80      = 240
 194         keyWorld81      = 241
 195         keyWorld82      = 242
 196         keyWorld83      = 243
 197         keyWorld84      = 244
 198         keyWorld85      = 245
 199         keyWorld86      = 246
 200         keyWorld87      = 247
 201         keyWorld88      = 248
 202         keyWorld89      = 249
 203         keyWorld90      = 250
 204         keyWorld91      = 251
 205         keyWorld92      = 252
 206         keyWorld93      = 253
 207         keyWorld94      = 254
 208         keyWorld95      = 255
 209
 210         // Numeric keypad
 211         keyKp0        = 256
 212         keyKp1        = 257
 213         keyKp2        = 258
 214         keyKp3        = 259
 215         keyKp4        = 260
 216         keyKp5        = 261
 217         keyKp6        = 262
 218         keyKp7        = 263
 219         keyKp8        = 264
 220         keyKp9        = 265
 221         keyKpPeriod   = 266
 222         keyKpDivide   = 267
 223         keyKpMultiply = 268
 224         keyKpMinus    = 269
 225         keyKpPlus     = 270
 226         keyKpEnter    = 271
 227         keyKpEquals   = 272
 228
 229         // Arrow & insert/delete pad
 230         keyUp       = 273
 231         keyDown     = 274
 232         keyRight    = 275
 233         keyLeft     = 276
 234         keyInsert   = 277
 235         keyHome     = 278
 236         keyEnd      = 279
 237         keyPageup   = 280
 238         keyPagedown = 281
 239
 240         // Function keys
 241         keyF1  = 282
 242         keyF2  = 283
 243         keyF3  = 284
 244         keyF4  = 285
 245         keyF5  = 286
 246         keyF6  = 287
 247         keyF7  = 288
 248         keyF8  = 289
 249         keyF9  = 290
 250         keyF10 = 291
 251         keyF11 = 292
 252         keyF12 = 293
 253         keyF13 = 294
 254         keyF14 = 295
 255         keyF15 = 296
 256
 257         // Modifier keys
 258         keyNumlock   = 300
 259         keyCapslock  = 301
 260         keyScrollock = 302
 261         keyRshift    = 303
 262         keyLshift    = 304
 263         keyRctrl     = 305
 264         keyLctrl     = 306
 265         keyRalt      = 307
 266         keyLalt      = 308
 267         keyRmeta     = 309
 268         keyLmeta     = 310
 269         keyLsuper    = 311
 270         keyRsuper    = 312
 271         keyMode      = 313
 272         keyCompose   = 314
 273
 274         // Misc keys
 275         keyHelp   = 315
 276         keyPrint  = 316
 277         keySysreq = 317
 278         keyBreak  = 318
 279         keyMenu   = 319
 280         keyPower  = 320
 281         keyEuro   = 321
 282         keyUndo   = 322
 283
 284         // Add any other keys here
 285         keyLast
 286 )
 287
 288 // A keymod is a set of bit flags
 289 type keymod uint16
 290
 291 const (
 292         keymodNone     = 0x0000
 293         keymodLshift   = 0x0001
 294         keymodRshift   = 0x0002
 295         keymodLctrl    = 0x0040
 296         keymodRctrl    = 0x0080
 297         keymodLalt     = 0x0100
 298         keymodRalt     = 0x0200
 299         keymodLmeta    = 0x0400
 300         keymodRmeta    = 0x0800
 301         keymodNum      = 0x1000
 302         keymodCaps     = 0x2000
 303         keymodMode     = 0x4000
 304         keymodReserved = 0x8000
 305 )
 306
 307 const (
 308         mouseButtonLeft   = 1
 309         mouseButtonMiddle = 2
 310         mouseButtonRight  = 3
 311         mouseScrollUp     = 4
 312         mouseScrollDown   = 5
 313 )
 314
 315 const (
 316         mouseStateLeftButtonPressed   = 1
 317         mouseStateMiddleButtonPressed = 2
 318         mouseStateRightButtonPressed  = 4
 319 )
 320
 321 const (
 322         activeMouse       = 1 //  mouse leaving/entering
 323         activeInputFocus  = 2 // input focus lost/restored
 324         activeApplication = 4 // application minimized/restored
 325 )
 326
 327 const maxEventBytes = 64
 328
 329 type activeEvent struct {
 330         EventType eventType
 331         Gain      uint8
 332         State     uint8
 333 }
 334
 335 type exposeEvent struct {
 336         EventType eventType
 337 }
 338
 339 type keyboardEvent struct {
 340         EventType eventType
 341         Device    uint8
 342         State     uint8
 343         Pad       uint8
 344         ScanCode  uint8
 345         Pad1      uint8
 346         Key       key
 347         Mod       keymod
 348         Unicode   uint16
 349 }
 350
 351 type mouseMotionEvent struct {
 352         EventType eventType
 353         Device    uint8
 354         Buttons   uint8
 355         Pad       uint8
 356         X         uint16
 357         Y         uint16
 358         Xrel      int16
 359         Yrel      int16
 360 }
 361
 362 type mouseButtonEvent struct {
 363         EventType eventType
 364         Device    uint8
 365         Button    uint8
 366         State     uint8
 367         X         uint16
 368         Y         uint16
 369 }
 370
 371 type quitEvent struct {
 372         EventType eventType
 373 }
 374
 375 type syncEvent struct{}
 376
 377 type event interface{}
 378
 379 type reader []byte
 380
 381 func (r *reader) Read(p []byte) (n int, err os.Error) {
 382         b := *r
 383         if len(b) == 0 && len(p) > 0 {
 384                 return 0, os.EOF
 385         }
 386         n = copy(p, b)
 387         *r = b[n:]
 388         return
 389 }
 390
 391 func (w *Window) readEvents() {
 392         buf := make([]byte, maxEventBytes)
 393         clean := false
 394         var (
 395                 ea  *activeEvent
 396                 ee  *exposeEvent
 397                 ke  *keyboardEvent
 398                 mme *mouseMotionEvent
 399                 mbe *mouseButtonEvent
 400                 qe  *quitEvent
 401         )
 402         var m draw.MouseEvent
 403         for {
 404                 if err := videoPollEvent(buf); err != nil {
 405                         if !clean {
 406                                 clean = w.eventc <- draw.ConfigEvent{image.Config{ColorModel, w.Image.Bounds().Dx(), w.Image.Bounds().Dy()}}
 407                         }
 408                         time.Sleep(10e6) // 10ms
 409                         continue
 410                 }
 411                 clean = false
 412                 var e event
 413                 switch buf[0] {
 414                 default:
 415                         log.Print("unsupported event type", buf[0])
 416                         continue
 417                 case eventActive:
 418                         ea = new(activeEvent)
 419                         e = ea
 420                 case eventExpose:
 421                         ee = new(exposeEvent)
 422                         e = ee
 423                 case eventKeyDown, eventKeyUp:
 424                         ke = new(keyboardEvent)
 425                         e = ke
 426                 case eventMouseMotion:
 427                         mme = new(mouseMotionEvent)
 428                         e = mme
 429                 case eventMouseButtonDown, eventMouseButtonUp:
 430                         mbe = new(mouseButtonEvent)
 431                         e = mbe
 432                 case eventQuit:
 433                         qe = new(quitEvent)
 434                         e = qe
 435                 }
 436                 r := reader(buf)
 437                 if err := binary.Read(&r, binary.LittleEndian, e); err != nil {
 438                         log.Print("unpacking %T event: %s", e, err)
 439                         continue
 440                 }
 441                 // log.Printf("%#v\n", e);
 442                 switch buf[0] {
 443                 case eventExpose:
 444                         w.eventc <- draw.ConfigEvent{image.Config{ColorModel, w.Image.Bounds().Dx(), w.Image.Bounds().Dy()}}
 445                 case eventKeyDown:
 446                         w.eventc <- draw.KeyEvent{int(ke.Key)}
 447                 case eventKeyUp:
 448                         w.eventc <- draw.KeyEvent{-int(ke.Key)}
 449                 case eventMouseMotion:
 450                         m.Loc.X = int(mme.X)
 451                         m.Loc.Y = int(mme.Y)
 452                         m.Buttons = int(mme.Buttons)
 453                         m.Nsec = time.Nanoseconds()
 454                         _ = w.eventc <- m
 455                 case eventMouseButtonDown:
 456                         m.Loc.X = int(mbe.X)
 457                         m.Loc.Y = int(mbe.Y)
 458                         // TODO(rsc): Remove uint cast once 8g bug is fixed.
 459                         m.Buttons |= 1 << uint(mbe.Button-1)
 460                         m.Nsec = time.Nanoseconds()
 461                         _ = w.eventc <- m
 462                 case eventMouseButtonUp:
 463                         m.Loc.X = int(mbe.X)
 464                         m.Loc.Y = int(mbe.Y)
 465                         // TODO(rsc): Remove uint cast once 8g bug is fixed.
 466                         m.Buttons &^= 1 << uint(mbe.Button-1)
 467                         m.Nsec = time.Nanoseconds()
 468                         _ = w.eventc <- m
 469                 case eventQuit:
 470                         close(w.eventc)
 471                 }
 472         }
 473 }