src/guiChatConsole.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "guiChatConsole.h"
  21 #include "chat.h"
  22 #include "client.h"
  23 #include "debug.h"
  24 #include "gettime.h"
  25 #include "keycode.h"
  26 #include "settings.h"
  27 #include "porting.h"
  28 #include "client/tile.h"
  29 #include "fontengine.h"
  30 #include "log.h"
  31 #include "gettext.h"
  32 #include <string>
  33
  34 #if USE_FREETYPE
  35         #include "xCGUITTFont.h"
  36 #endif
  37
  38 inline u32 clamp_u8(s32 value)
  39 {
  40         return (u32) MYMIN(MYMAX(value, 0), 255);
  41 }
  42
  43
  44 GUIChatConsole::GUIChatConsole(
  45                 gui::IGUIEnvironment* env,
  46                 gui::IGUIElement* parent,
  47                 s32 id,
  48                 ChatBackend* backend,
  49                 Client* client,
  50                 IMenuManager* menumgr
  51 ):
  52         IGUIElement(gui::EGUIET_ELEMENT, env, parent, id,
  53                         core::rect<s32>(0,0,100,100)),
  54         m_chat_backend(backend),
  55         m_client(client),
  56         m_menumgr(menumgr),
  57         m_screensize(v2u32(0,0)),
  58         m_animate_time_old(0),
  59         m_open(false),
  60         m_close_on_enter(false),
  61         m_height(0),
  62         m_desired_height(0),
  63         m_desired_height_fraction(0.0),
  64         m_height_speed(5.0),
  65         m_open_inhibited(0),
  66         m_cursor_blink(0.0),
  67         m_cursor_blink_speed(0.0),
  68         m_cursor_height(0.0),
  69         m_background(NULL),
  70         m_background_color(255, 0, 0, 0),
  71         m_font(NULL),
  72         m_fontsize(0, 0)
  73 {
  74         m_animate_time_old = getTimeMs();
  75
  76         // load background settings
  77         s32 console_alpha = g_settings->getS32("console_alpha");
  78         m_background_color.setAlpha(clamp_u8(console_alpha));
  79
  80         // load the background texture depending on settings
  81         ITextureSource *tsrc = client->getTextureSource();
  82         if (tsrc->isKnownSourceImage("background_chat.jpg")) {
  83                 m_background = tsrc->getTexture("background_chat.jpg");
  84                 m_background_color.setRed(255);
  85                 m_background_color.setGreen(255);
  86                 m_background_color.setBlue(255);
  87         } else {
  88                 v3f console_color = g_settings->getV3F("console_color");
  89                 m_background_color.setRed(clamp_u8(myround(console_color.X)));
  90                 m_background_color.setGreen(clamp_u8(myround(console_color.Y)));
  91                 m_background_color.setBlue(clamp_u8(myround(console_color.Z)));
  92         }
  93
  94         m_font = g_fontengine->getFont(FONT_SIZE_UNSPECIFIED, FM_Mono);
  95
  96         if (m_font == NULL)
  97         {
  98                 errorstream << "GUIChatConsole: Unable to load mono font ";
  99         }
 100         else
 101         {
 102                 core::dimension2d<u32> dim = m_font->getDimension(L"M");
 103                 m_fontsize = v2u32(dim.Width, dim.Height);
 104                 m_font->grab();
 105         }
 106         m_fontsize.X = MYMAX(m_fontsize.X, 1);
 107         m_fontsize.Y = MYMAX(m_fontsize.Y, 1);
 108
 109         // set default cursor options
 110         setCursor(true, true, 2.0, 0.1);
 111 }
 112
 113 GUIChatConsole::~GUIChatConsole()
 114 {
 115         if (m_font)
 116                 m_font->drop();
 117 }
 118
 119 void GUIChatConsole::openConsole(f32 scale)
 120 {
 121         assert(scale > 0.0f && scale <= 1.0f);
 122
 123         m_open = true;
 124         m_desired_height_fraction = scale;
 125         m_desired_height = scale * m_screensize.Y;
 126         reformatConsole();
 127         m_animate_time_old = getTimeMs();
 128         IGUIElement::setVisible(true);
 129         Environment->setFocus(this);
 130         m_menumgr->createdMenu(this);
 131 }
 132
 133 bool GUIChatConsole::isOpen() const
 134 {
 135         return m_open;
 136 }
 137
 138 bool GUIChatConsole::isOpenInhibited() const
 139 {
 140         return m_open_inhibited > 0;
 141 }
 142
 143 void GUIChatConsole::closeConsole()
 144 {
 145         m_open = false;
 146         Environment->removeFocus(this);
 147         m_menumgr->deletingMenu(this);
 148 }
 149
 150 void GUIChatConsole::closeConsoleAtOnce()
 151 {
 152         closeConsole();
 153         m_height = 0;
 154         recalculateConsolePosition();
 155 }
 156
 157 f32 GUIChatConsole::getDesiredHeight() const
 158 {
 159         return m_desired_height_fraction;
 160 }
 161
 162 void GUIChatConsole::replaceAndAddToHistory(std::wstring line)
 163 {
 164         ChatPrompt& prompt = m_chat_backend->getPrompt();
 165         prompt.addToHistory(prompt.getLine());
 166         prompt.replace(line);
 167 }
 168
 169
 170 void GUIChatConsole::setCursor(
 171         bool visible, bool blinking, f32 blink_speed, f32 relative_height)
 172 {
 173         if (visible)
 174         {
 175                 if (blinking)
 176                 {
 177                         // leave m_cursor_blink unchanged
 178                         m_cursor_blink_speed = blink_speed;
 179                 }
 180                 else
 181                 {
 182                         m_cursor_blink = 0x8000;  // on
 183                         m_cursor_blink_speed = 0.0;
 184                 }
 185         }
 186         else
 187         {
 188                 m_cursor_blink = 0;  // off
 189                 m_cursor_blink_speed = 0.0;
 190         }
 191         m_cursor_height = relative_height;
 192 }
 193
 194 void GUIChatConsole::draw()
 195 {
 196         if(!IsVisible)
 197                 return;
 198
 199         video::IVideoDriver* driver = Environment->getVideoDriver();
 200
 201         // Check screen size
 202         v2u32 screensize = driver->getScreenSize();
 203         if (screensize != m_screensize)
 204         {
 205                 // screen size has changed
 206                 // scale current console height to new window size
 207                 if (m_screensize.Y != 0)
 208                         m_height = m_height * screensize.Y / m_screensize.Y;
 209                 m_desired_height = m_desired_height_fraction * m_screensize.Y;
 210                 m_screensize = screensize;
 211                 reformatConsole();
 212         }
 213
 214         // Animation
 215         u32 now = getTimeMs();
 216         animate(now - m_animate_time_old);
 217         m_animate_time_old = now;
 218
 219         // Draw console elements if visible
 220         if (m_height > 0)
 221         {
 222                 drawBackground();
 223                 drawText();
 224                 drawPrompt();
 225         }
 226
 227         gui::IGUIElement::draw();
 228 }
 229
 230 void GUIChatConsole::reformatConsole()
 231 {
 232         s32 cols = m_screensize.X / m_fontsize.X - 2; // make room for a margin (looks better)
 233         s32 rows = m_desired_height / m_fontsize.Y - 1; // make room for the input prompt
 234         if (cols <= 0 || rows <= 0)
 235                 cols = rows = 0;
 236         m_chat_backend->reformat(cols, rows);
 237 }
 238
 239 void GUIChatConsole::recalculateConsolePosition()
 240 {
 241         core::rect<s32> rect(0, 0, m_screensize.X, m_height);
 242         DesiredRect = rect;
 243         recalculateAbsolutePosition(false);
 244 }
 245
 246 void GUIChatConsole::animate(u32 msec)
 247 {
 248         // animate the console height
 249         s32 goal = m_open ? m_desired_height : 0;
 250
 251         // Set invisible if close animation finished (reset by openConsole)
 252         // This function (animate()) is never called once its visibility becomes false so do not
 253         //              actually set visible to false before the inhibited period is over
 254         if (!m_open && m_height == 0 && m_open_inhibited == 0)
 255                 IGUIElement::setVisible(false);
 256
 257         if (m_height != goal)
 258         {
 259                 s32 max_change = msec * m_screensize.Y * (m_height_speed / 1000.0);
 260                 if (max_change == 0)
 261                         max_change = 1;
 262
 263                 if (m_height < goal)
 264                 {
 265                         // increase height
 266                         if (m_height + max_change < goal)
 267                                 m_height += max_change;
 268                         else
 269                                 m_height = goal;
 270                 }
 271                 else
 272                 {
 273                         // decrease height
 274                         if (m_height > goal + max_change)
 275                                 m_height -= max_change;
 276                         else
 277                                 m_height = goal;
 278                 }
 279
 280                 recalculateConsolePosition();
 281         }
 282
 283         // blink the cursor
 284         if (m_cursor_blink_speed != 0.0)
 285         {
 286                 u32 blink_increase = 0x10000 * msec * (m_cursor_blink_speed / 1000.0);
 287                 if (blink_increase == 0)
 288                         blink_increase = 1;
 289                 m_cursor_blink = ((m_cursor_blink + blink_increase) & 0xffff);
 290         }
 291
 292         // decrease open inhibit counter
 293         if (m_open_inhibited > msec)
 294                 m_open_inhibited -= msec;
 295         else
 296                 m_open_inhibited = 0;
 297 }
 298
 299 void GUIChatConsole::drawBackground()
 300 {
 301         video::IVideoDriver* driver = Environment->getVideoDriver();
 302         if (m_background != NULL)
 303         {
 304                 core::rect<s32> sourcerect(0, -m_height, m_screensize.X, 0);
 305                 driver->draw2DImage(
 306                         m_background,
 307                         v2s32(0, 0),
 308                         sourcerect,
 309                         &AbsoluteClippingRect,
 310                         m_background_color,
 311                         false);
 312         }
 313         else
 314         {
 315                 driver->draw2DRectangle(
 316                         m_background_color,
 317                         core::rect<s32>(0, 0, m_screensize.X, m_height),
 318                         &AbsoluteClippingRect);
 319         }
 320 }
 321
 322 void GUIChatConsole::drawText()
 323 {
 324         if (m_font == NULL)
 325                 return;
 326
 327         ChatBuffer& buf = m_chat_backend->getConsoleBuffer();
 328         for (u32 row = 0; row < buf.getRows(); ++row)
 329         {
 330                 const ChatFormattedLine& line = buf.getFormattedLine(row);
 331                 if (line.fragments.empty())
 332                         continue;
 333
 334                 s32 line_height = m_fontsize.Y;
 335                 s32 y = row * line_height + m_height - m_desired_height;
 336                 if (y + line_height < 0)
 337                         continue;
 338
 339                 for (u32 i = 0; i < line.fragments.size(); ++i)
 340                 {
 341                         const ChatFormattedFragment& fragment = line.fragments[i];
 342                         s32 x = (fragment.column + 1) * m_fontsize.X;
 343                         core::rect<s32> destrect(
 344                                 x, y, x + m_fontsize.X * fragment.text.size(), y + m_fontsize.Y);
 345
 346
 347                         #if USE_FREETYPE
 348                         // Draw colored text if FreeType is enabled
 349                                 irr::gui::CGUITTFont *tmp = static_cast<irr::gui::CGUITTFont*>(m_font);
 350                                 tmp->draw(
 351                                         fragment.text,
 352                                         destrect,
 353                                         video::SColor(255, 255, 255, 255),
 354                                         false,
 355                                         false,
 356                                         &AbsoluteClippingRect);
 357                         #else
 358                         // Otherwise use standard text
 359                                 m_font->draw(
 360                                         fragment.text.c_str(),
 361                                         destrect,
 362                                         video::SColor(255, 255, 255, 255),
 363                                         false,
 364                                         false,
 365                                         &AbsoluteClippingRect);
 366                         #endif
 367                 }
 368         }
 369 }
 370
 371 void GUIChatConsole::drawPrompt()
 372 {
 373         if (m_font == NULL)
 374                 return;
 375
 376         u32 row = m_chat_backend->getConsoleBuffer().getRows();
 377         s32 line_height = m_fontsize.Y;
 378         s32 y = row * line_height + m_height - m_desired_height;
 379
 380         ChatPrompt& prompt = m_chat_backend->getPrompt();
 381         std::wstring prompt_text = prompt.getVisiblePortion();
 382
 383         // FIXME Draw string at once, not character by character
 384         // That will only work with the cursor once we have a monospace font
 385         for (u32 i = 0; i < prompt_text.size(); ++i)
 386         {
 387                 wchar_t ws[2] = {prompt_text[i], 0};
 388                 s32 x = (1 + i) * m_fontsize.X;
 389                 core::rect<s32> destrect(
 390                         x, y, x + m_fontsize.X, y + m_fontsize.Y);
 391                 m_font->draw(
 392                         ws,
 393                         destrect,
 394                         video::SColor(255, 255, 255, 255),
 395                         false,
 396                         false,
 397                         &AbsoluteClippingRect);
 398         }
 399
 400         // Draw the cursor during on periods
 401         if ((m_cursor_blink & 0x8000) != 0)
 402         {
 403                 s32 cursor_pos = prompt.getVisibleCursorPosition();
 404                 if (cursor_pos >= 0)
 405                 {
 406                         s32 cursor_len = prompt.getCursorLength();
 407                         video::IVideoDriver* driver = Environment->getVideoDriver();
 408                         s32 x = (1 + cursor_pos) * m_fontsize.X;
 409                         core::rect<s32> destrect(
 410                                 x,
 411                                 y + m_fontsize.Y * (1.0 - m_cursor_height),
 412                                 x + m_fontsize.X * MYMAX(cursor_len, 1),
 413                                 y + m_fontsize.Y * (cursor_len ? m_cursor_height+1 : 1)
 414                         );
 415                         video::SColor cursor_color(255,255,255,255);
 416                         driver->draw2DRectangle(
 417                                 cursor_color,
 418                                 destrect,
 419                                 &AbsoluteClippingRect);
 420                 }
 421         }
 422
 423 }
 424
 425 bool GUIChatConsole::OnEvent(const SEvent& event)
 426 {
 427
 428         ChatPrompt &prompt = m_chat_backend->getPrompt();
 429
 430         if(event.EventType == EET_KEY_INPUT_EVENT && event.KeyInput.PressedDown)
 431         {
 432                 // Key input
 433                 if(KeyPress(event.KeyInput) == getKeySetting("keymap_console"))
 434                 {
 435                         closeConsole();
 436
 437                         // inhibit open so the_game doesn't reopen immediately
 438                         m_open_inhibited = 50;
 439                         m_close_on_enter = false;
 440                         return true;
 441                 }
 442                 else if(event.KeyInput.Key == KEY_ESCAPE)
 443                 {
 444                         closeConsoleAtOnce();
 445                         m_close_on_enter = false;
 446                         // inhibit open so the_game doesn't reopen immediately
 447                         m_open_inhibited = 1; // so the ESCAPE button doesn't open the "pause menu"
 448                         return true;
 449                 }
 450                 else if(event.KeyInput.Key == KEY_PRIOR)
 451                 {
 452                         m_chat_backend->scrollPageUp();
 453                         return true;
 454                 }
 455                 else if(event.KeyInput.Key == KEY_NEXT)
 456                 {
 457                         m_chat_backend->scrollPageDown();
 458                         return true;
 459                 }
 460                 else if(event.KeyInput.Key == KEY_RETURN)
 461                 {
 462                         prompt.addToHistory(prompt.getLine());
 463                         std::wstring text = prompt.replace(L"");
 464                         m_client->typeChatMessage(text);
 465                         if (m_close_on_enter) {
 466                                 closeConsoleAtOnce();
 467                                 m_close_on_enter = false;
 468                         }
 469                         return true;
 470                 }
 471                 else if(event.KeyInput.Key == KEY_UP)
 472                 {
 473                         // Up pressed
 474                         // Move back in history
 475                         prompt.historyPrev();
 476                         return true;
 477                 }
 478                 else if(event.KeyInput.Key == KEY_DOWN)
 479                 {
 480                         // Down pressed
 481                         // Move forward in history
 482                         prompt.historyNext();
 483                         return true;
 484                 }
 485                 else if(event.KeyInput.Key == KEY_LEFT || event.KeyInput.Key == KEY_RIGHT)
 486                 {
 487                         // Left/right pressed
 488                         // Move/select character/word to the left depending on control and shift keys
 489                         ChatPrompt::CursorOp op = event.KeyInput.Shift ?
 490                                 ChatPrompt::CURSOROP_SELECT :
 491                                 ChatPrompt::CURSOROP_MOVE;
 492                         ChatPrompt::CursorOpDir dir = event.KeyInput.Key == KEY_LEFT ?
 493                                 ChatPrompt::CURSOROP_DIR_LEFT :
 494                                 ChatPrompt::CURSOROP_DIR_RIGHT;
 495                         ChatPrompt::CursorOpScope scope = event.KeyInput.Control ?
 496                                 ChatPrompt::CURSOROP_SCOPE_WORD :
 497                                 ChatPrompt::CURSOROP_SCOPE_CHARACTER;
 498                         prompt.cursorOperation(op, dir, scope);
 499                         return true;
 500                 }
 501                 else if(event.KeyInput.Key == KEY_HOME)
 502                 {
 503                         // Home pressed
 504                         // move to beginning of line
 505                         prompt.cursorOperation(
 506                                 ChatPrompt::CURSOROP_MOVE,
 507                                 ChatPrompt::CURSOROP_DIR_LEFT,
 508                                 ChatPrompt::CURSOROP_SCOPE_LINE);
 509                         return true;
 510                 }
 511                 else if(event.KeyInput.Key == KEY_END)
 512                 {
 513                         // End pressed
 514                         // move to end of line
 515                         prompt.cursorOperation(
 516                                 ChatPrompt::CURSOROP_MOVE,
 517                                 ChatPrompt::CURSOROP_DIR_RIGHT,
 518                                 ChatPrompt::CURSOROP_SCOPE_LINE);
 519                         return true;
 520                 }
 521                 else if(event.KeyInput.Key == KEY_BACK)
 522                 {
 523                         // Backspace or Ctrl-Backspace pressed
 524                         // delete character / word to the left
 525                         ChatPrompt::CursorOpScope scope =
 526                                 event.KeyInput.Control ?
 527                                 ChatPrompt::CURSOROP_SCOPE_WORD :
 528                                 ChatPrompt::CURSOROP_SCOPE_CHARACTER;
 529                         prompt.cursorOperation(
 530                                 ChatPrompt::CURSOROP_DELETE,
 531                                 ChatPrompt::CURSOROP_DIR_LEFT,
 532                                 scope);
 533                         return true;
 534                 }
 535                 else if(event.KeyInput.Key == KEY_DELETE)
 536                 {
 537                         // Delete or Ctrl-Delete pressed
 538                         // delete character / word to the right
 539                         ChatPrompt::CursorOpScope scope =
 540                                 event.KeyInput.Control ?
 541                                 ChatPrompt::CURSOROP_SCOPE_WORD :
 542                                 ChatPrompt::CURSOROP_SCOPE_CHARACTER;
 543                         prompt.cursorOperation(
 544                                 ChatPrompt::CURSOROP_DELETE,
 545                                 ChatPrompt::CURSOROP_DIR_RIGHT,
 546                                 scope);
 547                         return true;
 548                 }
 549                 else if(event.KeyInput.Key == KEY_KEY_A && event.KeyInput.Control)
 550                 {
 551                         // Ctrl-A pressed
 552                         // Select all text
 553                         prompt.cursorOperation(
 554                                 ChatPrompt::CURSOROP_SELECT,
 555                                 ChatPrompt::CURSOROP_DIR_LEFT, // Ignored
 556                                 ChatPrompt::CURSOROP_SCOPE_LINE);
 557                         return true;
 558                 }
 559                 else if(event.KeyInput.Key == KEY_KEY_C && event.KeyInput.Control)
 560                 {
 561                         // Ctrl-C pressed
 562                         // Copy text to clipboard
 563                         if (prompt.getCursorLength() <= 0)
 564                                 return true;
 565                         std::wstring wselected = prompt.getSelection();
 566                         std::string selected(wselected.begin(), wselected.end());
 567                         Environment->getOSOperator()->copyToClipboard(selected.c_str());
 568                         return true;
 569                 }
 570                 else if(event.KeyInput.Key == KEY_KEY_V && event.KeyInput.Control)
 571                 {
 572                         // Ctrl-V pressed
 573                         // paste text from clipboard
 574                         if (prompt.getCursorLength() > 0) {
 575                                 // Delete selected section of text
 576                                 prompt.cursorOperation(
 577                                         ChatPrompt::CURSOROP_DELETE,
 578                                         ChatPrompt::CURSOROP_DIR_LEFT, // Ignored
 579                                         ChatPrompt::CURSOROP_SCOPE_SELECTION);
 580                         }
 581                         IOSOperator *os_operator = Environment->getOSOperator();
 582                         const c8 *text = os_operator->getTextFromClipboard();
 583                         if (!text)
 584                                 return true;
 585                         std::basic_string<unsigned char> str((const unsigned char*)text);
 586                         prompt.input(std::wstring(str.begin(), str.end()));
 587                         return true;
 588                 }
 589                 else if(event.KeyInput.Key == KEY_KEY_X && event.KeyInput.Control)
 590                 {
 591                         // Ctrl-X pressed
 592                         // Cut text to clipboard
 593                         if (prompt.getCursorLength() <= 0)
 594                                 return true;
 595                         std::wstring wselected = prompt.getSelection();
 596                         std::string selected(wselected.begin(), wselected.end());
 597                         Environment->getOSOperator()->copyToClipboard(selected.c_str());
 598                         prompt.cursorOperation(
 599                                 ChatPrompt::CURSOROP_DELETE,
 600                                 ChatPrompt::CURSOROP_DIR_LEFT, // Ignored
 601                                 ChatPrompt::CURSOROP_SCOPE_SELECTION);
 602                         return true;
 603                 }
 604                 else if(event.KeyInput.Key == KEY_KEY_U && event.KeyInput.Control)
 605                 {
 606                         // Ctrl-U pressed
 607                         // kill line to left end
 608                         prompt.cursorOperation(
 609                                 ChatPrompt::CURSOROP_DELETE,
 610                                 ChatPrompt::CURSOROP_DIR_LEFT,
 611                                 ChatPrompt::CURSOROP_SCOPE_LINE);
 612                         return true;
 613                 }
 614                 else if(event.KeyInput.Key == KEY_KEY_K && event.KeyInput.Control)
 615                 {
 616                         // Ctrl-K pressed
 617                         // kill line to right end
 618                         prompt.cursorOperation(
 619                                 ChatPrompt::CURSOROP_DELETE,
 620                                 ChatPrompt::CURSOROP_DIR_RIGHT,
 621                                 ChatPrompt::CURSOROP_SCOPE_LINE);
 622                         return true;
 623                 }
 624                 else if(event.KeyInput.Key == KEY_TAB)
 625                 {
 626                         // Tab or Shift-Tab pressed
 627                         // Nick completion
 628                         std::list<std::string> names = m_client->getConnectedPlayerNames();
 629                         bool backwards = event.KeyInput.Shift;
 630                         prompt.nickCompletion(names, backwards);
 631                         return true;
 632                 }
 633                 else if(event.KeyInput.Char != 0 && !event.KeyInput.Control)
 634                 {
 635                         #if defined(__linux__) && (IRRLICHT_VERSION_MAJOR == 1 && IRRLICHT_VERSION_MINOR < 9)
 636                                 wchar_t wc = L'_';
 637                                 mbtowc( &wc, (char *) &event.KeyInput.Char, sizeof(event.KeyInput.Char) );
 638                                 prompt.input(wc);
 639                         #else
 640                                 prompt.input(event.KeyInput.Char);
 641                         #endif
 642                         return true;
 643                 }
 644         }
 645         else if(event.EventType == EET_MOUSE_INPUT_EVENT)
 646         {
 647                 if(event.MouseInput.Event == EMIE_MOUSE_WHEEL)
 648                 {
 649                         s32 rows = myround(-3.0 * event.MouseInput.Wheel);
 650                         m_chat_backend->scroll(rows);
 651                 }
 652         }
 653
 654         return Parent ? Parent->OnEvent(event) : false;
 655 }
 656
 657 void GUIChatConsole::setVisible(bool visible)
 658 {
 659         m_open = visible;
 660         IGUIElement::setVisible(visible);
 661         if (!visible) {
 662                 m_height = 0;
 663                 recalculateConsolePosition();
 664         }
 665 }
 666