1 /* 2 This file is part of Konsole, an X terminal. 3 4 Copyright 2007-2008 by Robert Knight <robertknight@gmail.com> 5 Copyright 1997,1998 by Lars Doelle <lars.doelle@on-line.de> 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 20 02110-1301 USA. 21 */ 22 23 #ifndef EMULATION_H 24 #define EMULATION_H 25 26 // System 27 #include <stdio.h> 28 29 // Qt 30 #include <QKeyEvent> 31 //#include <QPointer> 32 #include <QTextCodec> 33 #include <QTextStream> 34 #include <QTimer> 35 36 // Konsole 37 //#include "konsole_export.h" 38 #define KONSOLEPRIVATE_EXPORT 39 40 namespace Konsole 41 { 42 43 class KeyboardTranslator; 44 class HistoryType; 45 class Screen; 46 class ScreenWindow; 47 class TerminalCharacterDecoder; 48 49 /** 50 * This enum describes the available states which 51 * the terminal emulation may be set to. 52 * 53 * These are the values used by Emulation::stateChanged() 54 */ 55 enum 56 { 57 /** The emulation is currently receiving user input. */ 58 NOTIFYNORMAL = 0, 59 /** 60 * The terminal program has triggered a bell event 61 * to get the user's attention. 62 */ 63 NOTIFYBELL = 1, 64 /** 65 * The emulation is currently receiving data from its 66 * terminal input. 67 */ 68 NOTIFYACTIVITY = 2, 69 70 // unused here? 71 NOTIFYSILENCE = 3 72 }; 73 74 /** 75 * Base class for terminal emulation back-ends. 76 * 77 * The back-end is responsible for decoding an incoming character stream and 78 * producing an output image of characters. 79 * 80 * When input from the terminal is received, the receiveData() slot should be called with 81 * the data which has arrived. The emulation will process the data and update the 82 * screen image accordingly. The codec used to decode the incoming character stream 83 * into the unicode characters used internally can be specified using setCodec() 84 * 85 * The size of the screen image can be specified by calling setImageSize() with the 86 * desired number of lines and columns. When new lines are added, old content 87 * is moved into a history store, which can be set by calling setHistory(). 88 * 89 * The screen image can be accessed by creating a ScreenWindow onto this emulation 90 * by calling createWindow(). Screen windows provide access to a section of the 91 * output. Each screen window covers the same number of lines and columns as the 92 * image size returned by imageSize(). The screen window can be moved up and down 93 * and provides transparent access to both the current on-screen image and the 94 * previous output. The screen windows emit an outputChanged signal 95 * when the section of the image they are looking at changes. 96 * Graphical views can then render the contents of a screen window, listening for notifications 97 * of output changes from the screen window which they are associated with and updating 98 * accordingly. 99 * 100 * The emulation also is also responsible for converting input from the connected views such 101 * as keypresses and mouse activity into a character string which can be sent 102 * to the terminal program. Key presses can be processed by calling the sendKeyEvent() slot, 103 * while mouse events can be processed using the sendMouseEvent() slot. When the character 104 * stream has been produced, the emulation will emit a sendData() signal with a pointer 105 * to the character buffer. This data should be fed to the standard input of the terminal 106 * process. The translation of key presses into an output character stream is performed 107 * using a lookup in a set of key bindings which map key sequences to output 108 * character sequences. The name of the key bindings set used can be specified using 109 * setKeyBindings() 110 * 111 * The emulation maintains certain state information which changes depending on the 112 * input received. The emulation can be reset back to its starting state by calling 113 * reset(). 114 * 115 * The emulation also maintains an activity state, which specifies whether 116 * terminal is currently active ( when data is received ), normal 117 * ( when the terminal is idle or receiving user input ) or trying 118 * to alert the user ( also known as a "Bell" event ). The stateSet() signal 119 * is emitted whenever the activity state is set. This can be used to determine 120 * how long the emulation has been active/idle for and also respond to 121 * a 'bell' event in different ways. 122 */ 123 class KONSOLEPRIVATE_EXPORT Emulation : public QObject 124 { 125 Q_OBJECT 126 127 public: 128 129 /** Constructs a new terminal emulation */ 130 Emulation(); 131 ~Emulation() override; 132 133 /** 134 * Creates a new window onto the output from this emulation. The contents 135 * of the window are then rendered by views which are set to use this window using the 136 * TerminalDisplay::setScreenWindow() method. 137 */ 138 ScreenWindow *createWindow(); 139 140 /** Returns the size of the screen image which the emulation produces */ 141 QSize imageSize() const; 142 143 /** 144 * Returns the total number of lines, including those stored in the history. 145 */ 146 int lineCount() const; 147 148 /** 149 * Sets the history store used by this emulation. When new lines 150 * are added to the output, older lines at the top of the screen are transferred to a history 151 * store. 152 * 153 * The number of lines which are kept and the storage location depend on the 154 * type of store. 155 */ 156 void setHistory( const HistoryType & ); 157 /** Returns the history store used by this emulation. See setHistory() */ 158 const HistoryType &history() const; 159 /** Clears the history scroll. */ 160 void clearHistory(); 161 162 /** 163 * Copies the output history from @p startLine to @p endLine 164 * into @p stream, using @p decoder to convert the terminal 165 * characters into text. 166 * 167 * \param decoder A decoder which converts lines of terminal characters with 168 * appearance attributes into output text. PlainTextDecoder is the most commonly 169 * used decoder. 170 * \param startLine Index of first line to copy 171 * \param endLine Index of last line to copy 172 */ 173 virtual void writeToStream( TerminalCharacterDecoder *decoder, int startLine, int endLine ); 174 175 /** Returns the codec used to decode incoming characters. See setCodec() */ codec()176 const QTextCodec *codec() const { return _codec; } 177 /** Sets the codec used to decode incoming characters. */ 178 void setCodec( const QTextCodec * ); 179 180 /** 181 * Convenience method. 182 * Returns true if the current codec used to decode incoming 183 * characters is UTF-8 184 */ utf8()185 bool utf8() const 186 { Q_ASSERT( _codec ); return _codec->mibEnum() == 106; } 187 188 189 /** TODO Document me */ 190 virtual char eraseChar() const; 191 192 /** 193 * Sets the key bindings used to key events 194 * ( received through sendKeyEvent() ) into character 195 * streams to send to the terminal. 196 */ 197 void setKeyBindings( const QString &name ); 198 /** 199 * Returns the name of the emulation's current key bindings. 200 * See setKeyBindings() 201 */ 202 QString keyBindings() const; 203 204 /** 205 * Copies the current image into the history and clears the screen. 206 */ 207 virtual void clearEntireScreen() = 0; 208 209 /** Resets the state of the terminal. */ 210 virtual void reset() = 0; 211 212 /** 213 * Returns true if the active terminal program wants 214 * mouse input events. 215 * 216 * The programUsesMouseChanged() signal is emitted when this 217 * changes. 218 */ 219 bool programUsesMouse() const; 220 221 public slots: 222 223 /** Change the size of the emulation's image */ 224 virtual void setImageSize( int lines, int columns ); 225 226 /** 227 * Interprets a sequence of characters and sends the result to the terminal. 228 * This is equivalent to calling sendKeyEvent() for each character in @p text in succession. 229 */ 230 virtual void sendText( const QString &text ) = 0; 231 232 /** 233 * Interprets a key press event and emits the sendData() signal with 234 * the resulting character stream. 235 */ 236 virtual void sendKeyEvent( QKeyEvent * ); 237 238 /** 239 * Converts information about a mouse event into an xterm-compatible escape 240 * sequence and emits the character sequence via sendData() 241 */ 242 virtual void sendMouseEvent( int buttons, int column, int line, int eventType ); 243 244 /** 245 * Sends a string of characters to the foreground terminal process. 246 * 247 * \param string The characters to send. 248 * \param length Length of @p string or if set to a negative value, @p string will 249 * be treated as a null-terminated string and its length will be determined automatically. 250 */ 251 virtual void sendString( const char *string, int length = -1 ) = 0; 252 253 /** 254 * Processes an incoming stream of characters. receiveData() decodes the incoming 255 * character buffer using the current codec(), and then calls receiveChar() for 256 * each unicode character in the resulting buffer. 257 * 258 * receiveData() also starts a timer which causes the outputChanged() signal 259 * to be emitted when it expires. The timer allows multiple updates in quick 260 * succession to be buffered into a single outputChanged() signal emission. 261 * 262 * \param buffer A string of characters received from the terminal program. 263 * \param len The length of @p buffer 264 */ 265 void receiveData( const char *buffer, int len ); 266 267 signals: 268 269 /** 270 * Emitted when a buffer of data is ready to send to the 271 * standard input of the terminal. 272 * 273 * \param data The buffer of data ready to be sent 274 * \param len The length of @p data in bytes 275 */ 276 void sendData( const char *data, int len ); 277 278 /** 279 * Requests that sending of input to the emulation 280 * from the terminal process be suspended or resumed. 281 * 282 * \param suspend If true, requests that sending of 283 * input from the terminal process' stdout be 284 * suspended. Otherwise requests that sending of 285 * input be resumed. 286 */ 287 void lockPtyRequest( bool suspend ); 288 289 /** 290 * Requests that the pty used by the terminal process 291 * be set to UTF 8 mode. 292 * 293 * TODO: More documentation 294 */ 295 void useUtf8Request( bool ); 296 297 /** 298 * Emitted when the activity state of the emulation is set. 299 * 300 * \param state The new activity state, one of NOTIFYNORMAL, NOTIFYACTIVITY 301 * or NOTIFYBELL 302 */ 303 void stateSet( int state ); 304 305 /** TODO Document me */ 306 void zmodemDetected(); 307 308 309 /** 310 * Requests that the color of the text used 311 * to represent the tabs associated with this 312 * emulation be changed. This is a Konsole-specific 313 * extension from pre-KDE 4 times. 314 * 315 * TODO: Document how the parameter works. 316 */ 317 void changeTabTextColorRequest( int color ); 318 319 /** 320 * This is emitted when the program running in the shell indicates whether or 321 * not it is interested in mouse events. 322 * 323 * \param usesMouse This will be true if the program wants to be informed about 324 * mouse events or false otherwise. 325 */ 326 void programUsesMouseChanged( bool usesMouse ); 327 328 /** 329 * Emitted when the contents of the screen image change. 330 * The emulation buffers the updates from successive image changes, 331 * and only emits outputChanged() at sensible intervals when 332 * there is a lot of terminal activity. 333 * 334 * Normally there is no need for objects other than the screen windows 335 * created with createWindow() to listen for this signal. 336 * 337 * ScreenWindow objects created using createWindow() will emit their 338 * own outputChanged() signal in response to this signal. 339 */ 340 void outputChanged(); 341 342 /** 343 * Emitted when the program running in the terminal wishes to update the 344 * session's title. This also allows terminal programs to customize other 345 * aspects of the terminal emulation display. 346 * 347 * This signal is emitted when the escape sequence "\033]ARG;VALUE\007" 348 * is received in the input string, where ARG is a number specifying what 349 * should change and VALUE is a string specifying the new value. 350 * 351 * TODO: The name of this method is not very accurate since this method 352 * is used to perform a whole range of tasks besides just setting 353 * the user-title of the session. 354 * 355 * \param title Specifies what to change. 356 * <ul> 357 * <li>0 - Set window icon text and session title to @p newTitle</li> 358 * <li>1 - Set window icon text to @p newTitle</li> 359 * <li>2 - Set session title to @p newTitle</li> 360 * <li>11 - Set the session's default background color to @p newTitle, 361 * where @p newTitle can be an HTML-style string ("#RRGGBB") or a named 362 * color (e.g., 'red', 'blue'). 363 * See http://doc.trolltech.com/4.2/qcolor.html#setNamedColor for more 364 * details. 365 * </li> 366 * <li>31 - Supposedly treats @p newTitle as a URL and opens it (NOT IMPLEMENTED)</li> 367 * <li>32 - Sets the icon associated with the session. @p newTitle is the name 368 * of the icon to use, which can be the name of any icon in the current KDE icon 369 * theme (e.g., 'konsole', 'kate', 'folder_home')</li> 370 * </ul> 371 * \param newTitle Specifies the new title 372 */ 373 374 void titleChanged( int title, const QString &newTitle ); 375 376 /** 377 * Emitted when the program running in the terminal changes the 378 * screen size. 379 */ 380 void imageSizeChanged( int lineCount, int columnCount ); 381 382 /** 383 * Emitted when the terminal program requests to change various properties 384 * of the terminal display. 385 * 386 * A profile change command occurs when a special escape sequence, followed 387 * by a string containing a series of name and value pairs is received. 388 * This string can be parsed using a ProfileCommandParser instance. 389 * 390 * \param text A string expected to contain a series of key and value pairs in 391 * the form: name=value;name2=value2 ... 392 */ 393 void profileChangeCommandReceived( const QString &text ); 394 395 /** 396 * Emitted when a flow control key combination ( Ctrl+S or Ctrl+Q ) is pressed. 397 * \param suspendKeyPressed TRUE if Ctrl+S was pressed to suspend output or Ctrl+Q to 398 * resume output. 399 */ 400 void flowControlKeyPressed( bool suspendKeyPressed ); 401 402 protected: 403 virtual void setMode( int mode ) = 0; 404 virtual void resetMode( int mode ) = 0; 405 406 /** 407 * Processes an incoming character. See receiveData() 408 * @p ch A unicode character code. 409 */ 410 virtual void receiveChar( int ch ); 411 412 /** 413 * Sets the active screen. The terminal has two screens, primary and alternate. 414 * The primary screen is used by default. When certain interactive programs such 415 * as Vim are run, they trigger a switch to the alternate screen. 416 * 417 * \param index 0 to switch to the primary screen, or 1 to switch to the alternate screen 418 */ 419 void setScreen( int index ); 420 421 enum EmulationCodec 422 { 423 LocaleCodec = 0, 424 Utf8Codec = 1 425 }; 426 void setCodec( EmulationCodec codec ); // codec number, 0 = locale, 1=utf8 427 428 429 QList<ScreenWindow *> _windows; 430 431 Screen *_currentScreen; // pointer to the screen which is currently active, 432 // this is one of the elements in the screen[] array 433 434 Screen *_screen[2]; // 0 = primary screen ( used by most programs, including the shell 435 // scrollbars are enabled in this mode ) 436 // 1 = alternate ( used by vi , emacs etc. 437 // scrollbars are not enabled in this mode ) 438 439 440 //decodes an incoming C-style character stream into a unicode QString using 441 //the current text codec. (this allows for rendering of non-ASCII characters in text files etc.) 442 const QTextCodec *_codec; 443 QTextDecoder *_decoder; 444 const KeyboardTranslator *_keyTranslator; // the keyboard layout 445 446 protected slots: 447 /** 448 * Schedules an update of attached views. 449 * Repeated calls to bufferedUpdate() in close succession will result in only a single update, 450 * much like the Qt buffered update of widgets. 451 */ 452 void bufferedUpdate(); 453 454 private slots: 455 456 // triggered by timer, causes the emulation to send an updated screen image to each 457 // view 458 void showBulk(); 459 460 void usesMouseChanged( bool usesMouse ); 461 462 private: 463 bool _usesMouse; 464 QTimer _bulkTimer1; 465 QTimer _bulkTimer2; 466 467 }; 468 469 } 470 471 #endif // ifndef EMULATION_H 472