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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 | #region License/* FNA - XNA4 Reimplementation for Desktop Platforms * Copyright 2009-2016 Ethan Lee and the MonoGame Team * * Released under the Microsoft Public License. * See LICENSE for details. */#endregion#region Using Statementsusing System.Collections.Generic;#endregionnamespace Microsoft.Xna.Framework.Input{ /// <summary> /// Holds the state of keystrokes by a keyboard. /// </summary> public struct KeyboardState { #region Public Properties /// <summary> /// Returns the state of a specified key. /// </summary> /// <param name="key">The key to query.</param> /// <returns>The state of the key.</returns> public KeyState this[Keys key] { get { return InternalGetKey(key) ? KeyState.Down : KeyState.Up; } } #endregion #region Private Variables // Array of 256 bits: uint keys0, keys1, keys2, keys3, keys4, keys5, keys6, keys7; #endregion #region Private Static Variables // Used for the common situation where GetPressedKeys will return an empty array static Keys[] empty = new Keys[0]; #endregion #region Public Constructor /// <summary> /// Initializes a new instance of the <see cref="KeyboardState"/> class. /// </summary> /// <param name="keys">List of keys to be flagged as pressed on initialization.</param> public KeyboardState(params Keys[] keys) { keys0 = 0; keys1 = 0; keys2 = 0; keys3 = 0; keys4 = 0; keys5 = 0; keys6 = 0; keys7 = 0; if (keys != null) { foreach (Keys k in keys) { InternalSetKey(k); } } } #endregion #region Internal Constructor /// <summary> /// Initializes a new instance of the <see cref="KeyboardState"/> class. /// </summary> /// <param name="keys">List of keys to be flagged as pressed on initialization.</param> internal KeyboardState(List<Keys> keys) { keys0 = 0; keys1 = 0; keys2 = 0; keys3 = 0; keys4 = 0; keys5 = 0; keys6 = 0; keys7 = 0; if (keys != null) { foreach (Keys k in keys) { InternalSetKey(k); } } } #endregion #region Public Methods /// <summary> /// Gets whether given key is currently being pressed. /// </summary> /// <param name="key">The key to query.</param> /// <returns>true if the key is pressed; false otherwise.</returns> public bool IsKeyDown(Keys key) { return InternalGetKey(key); } /// <summary> /// Gets whether given key is currently being not pressed. /// </summary> /// <param name="key">The key to query.</param> /// <returns>true if the key is not pressed; false otherwise.</returns> public bool IsKeyUp(Keys key) { return !InternalGetKey(key); } /// <summary> /// Returns an array of values holding keys that are currently being pressed. /// </summary> /// <returns>The keys that are currently being pressed.</returns> public Keys[] GetPressedKeys() { uint count = ( CountBits(keys0) + CountBits(keys1) + CountBits(keys2) + CountBits(keys3) + CountBits(keys4) + CountBits(keys5) + CountBits(keys6) + CountBits(keys7) ); if (count == 0) { return empty; } Keys[] keys = new Keys[count]; int index = 0; if (keys0 != 0) { index = AddKeysToArray(keys0, 0 * 32, keys, index); } if (keys1 != 0) { index = AddKeysToArray(keys1, 1 * 32, keys, index); } if (keys2 != 0) { index = AddKeysToArray(keys2, 2 * 32, keys, index); } if (keys3 != 0) { index = AddKeysToArray(keys3, 3 * 32, keys, index); } if (keys4 != 0) { index = AddKeysToArray(keys4, 4 * 32, keys, index); } if (keys5 != 0) { index = AddKeysToArray(keys5, 5 * 32, keys, index); } if (keys6 != 0) { index = AddKeysToArray(keys6, 6 * 32, keys, index); } if (keys7 != 0) { index = AddKeysToArray(keys7, 7 * 32, keys, index); } return keys; } #endregion #region Private Methods bool InternalGetKey(Keys key) { uint mask = (uint) 1 << (((int) key) & 0x1f); uint element; switch (((int) key) >> 5) { case 0: element = keys0; break; case 1: element = keys1; break; case 2: element = keys2; break; case 3: element = keys3; break; case 4: element = keys4; break; case 5: element = keys5; break; case 6: element = keys6; break; case 7: element = keys7; break; default: element = 0; break; } return (element & mask) != 0; } void InternalSetKey(Keys key) { uint mask = (uint) 1 << (((int) key) & 0x1f); switch (((int) key) >> 5) { case 0: keys0 |= mask; break; case 1: keys1 |= mask; break; case 2: keys2 |= mask; break; case 3: keys3 |= mask; break; case 4: keys4 |= mask; break; case 5: keys5 |= mask; break; case 6: keys6 |= mask; break; case 7: keys7 |= mask; break; } } void InternalClearKey(Keys key) { uint mask = (uint) 1 << (((int) key) & 0x1f); switch (((int) key) >> 5) { case 0: keys0 &= ~mask; break; case 1: keys1 &= ~mask; break; case 2: keys2 &= ~mask; break; case 3: keys3 &= ~mask; break; case 4: keys4 &= ~mask; break; case 5: keys5 &= ~mask; break; case 6: keys6 &= ~mask; break; case 7: keys7 &= ~mask; break; } } void InternalClearAllKeys() { keys0 = 0; keys1 = 0; keys2 = 0; keys3 = 0; keys4 = 0; keys5 = 0; keys6 = 0; keys7 = 0; } #endregion #region Public Static Operators and Override Methods /// <summary> /// Gets the hash code for <see cref="KeyboardState"/> instance. /// </summary> /// <returns>Hash code of the object.</returns> public override int GetHashCode() { return (int) (keys0 ^ keys1 ^ keys2 ^ keys3 ^ keys4 ^ keys5 ^ keys6 ^ keys7); } /// <summary> /// Compares whether two <see cref="KeyboardState"/> instances are equal. /// </summary> /// <param name="a"><see cref="KeyboardState"/> instance to the left of the equality operator.</param> /// <param name="b"><see cref="KeyboardState"/> instance to the right of the equality operator.</param> /// <returns>true if the instances are equal; false otherwise.</returns> public static bool operator ==(KeyboardState a, KeyboardState b) { return ( a.keys0 == b.keys0 && a.keys1 == b.keys1 && a.keys2 == b.keys2 && a.keys3 == b.keys3 && a.keys4 == b.keys4 && a.keys5 == b.keys5 && a.keys6 == b.keys6 && a.keys7 == b.keys7 ); } /// <summary> /// Compares whether two <see cref="KeyboardState"/> instances are not equal. /// </summary> /// <param name="a"><see cref="KeyboardState"/> instance to the left of the inequality operator.</param> /// <param name="b"><see cref="KeyboardState"/> instance to the right of the inequality operator.</param> /// <returns>true if the instances are different; false otherwise.</returns> public static bool operator !=(KeyboardState a, KeyboardState b) { return !(a == b); } /// <summary> /// Compares whether current instance is equal to specified object. /// </summary> /// <param name="obj">The <see cref="KeyboardState"/> to compare.</param> /// <returns>true if the provided <see cref="KeyboardState"/> instance is same with current; false otherwise.</returns> public override bool Equals(object obj) { return obj is KeyboardState && this == (KeyboardState) obj; } #endregion #region Private Static Methods private static uint CountBits(uint v) { // http://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetParallel v = v - ((v >> 1) & 0x55555555); // reuse input as temporary v = (v & 0x33333333) + ((v >> 2) & 0x33333333); // temp return ((v + (v >> 4) & 0xF0F0F0F) * 0x1010101) >> 24; // count } private static int AddKeysToArray(uint keys, int offset, Keys[] pressedKeys, int index) { for (int i = 0; i < 32; i += 1) { if ((keys & (1 << i)) != 0) { pressedKeys[index++] = (Keys) (offset + i); } } return index; } #endregion }} |
