src/frontends/screen.C

   1 /**
   2  * \file screen.C
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author John Levon
   7  *
   8  * Full author contact details are available in file CREDITS
   9  *
  10  * Splash screen code added by Angus Leeming
  11  */
  12
  13 #ifdef __GNUG__
  14 #pragma implementation
  15 #endif
  16
  17 #include <config.h>
  18
  19 #include "screen.h"
  20 #include "lyxtext.h"
  21 #include "lyxrc.h"
  22 #include "lyxrow.h"
  23 #include "BufferView.h"
  24 #include "buffer.h"
  25 #include "WorkArea.h"
  26 #include "Painter.h"
  27 #include "font_metrics.h"
  28 #include "language.h"
  29 #include "debug.h"
  30
  31 // Splash screen-specific stuff
  32 #include "lyxfont.h"
  33 #include "version.h"
  34
  35 #include "graphics/GraphicsLoader.h"
  36 #include "graphics/GraphicsImage.h"
  37
  38 #include "support/filetools.h" // LibFileSearch
  39
  40 #include <boost/utility.hpp>
  41 #include <boost/bind.hpp>
  42 #include <boost/signals/trackable.hpp>
  43
  44 using std::min;
  45 using std::max;
  46 using std::endl;
  47
  48 namespace {
  49
  50 class SplashScreen : boost::noncopyable, boost::signals::trackable {
  51 public:
  52         /// This is a singleton class. Get the instance.
  53         static SplashScreen const & get();
  54         ///
  55         grfx::Image const * image() const { return loader_.image(); }
  56         ///
  57         string const & text() const { return text_; }
  58         ///
  59         LyXFont const & font() const { return font_; }
  60
  61 private:
  62         /** Make the c-tor private so we can control how many objects
  63          *  are instantiated.
  64          */
  65         SplashScreen();
  66
  67         ///
  68         grfx::Loader loader_;
  69         /// The text to be written on top of the pixmap
  70         string const text_;
  71         /// in this font...
  72         LyXFont font_;
  73 };
  74
  75
  76 SplashScreen const & SplashScreen::get()
  77 {
  78         static SplashScreen singleton;
  79         return singleton;
  80 }
  81
  82
  83 SplashScreen::SplashScreen()
  84         : text_(lyx_version ? lyx_version : "unknown")
  85 {
  86         if (!lyxrc.show_banner)
  87                 return;
  88
  89         string const file = LibFileSearch("images", "banner", "xpm");
  90         if (file.empty())
  91                 return;
  92
  93         // The font used to display the version info
  94         font_.setFamily(LyXFont::SANS_FAMILY);
  95         font_.setSeries(LyXFont::BOLD_SERIES);
  96         font_.setSize(LyXFont::SIZE_NORMAL);
  97         font_.setColor(LColor::yellow);
  98
  99         // Load up the graphics file
 100         loader_.reset(file);
 101         // We aren't interested here in when the image is loaded.
 102         // If it isn't ready when we want it, then we ignore it.
 103 //      loader_->statusChanged.connect(
 104 //                      boost::bind(&SplashScreen::statusChanged, this));
 105         if (loader_.status() == grfx::WaitingToLoad)
 106                 loader_.startLoading();
 107 }
 108
 109 } // namespace anon
 110
 111
 112 LyXScreen::LyXScreen()
 113         : force_clear_(true), cursor_visible_(false)
 114 {
 115         // Start loading the pixmap as soon as possible
 116         SplashScreen::get();
 117 }
 118
 119
 120 LyXScreen::~LyXScreen()
 121 {
 122 }
 123
 124 // FIXME: GUII these cursor methods need to decide
 125 // whether the workarea is focused or not
 126
 127 void LyXScreen::showCursor(LyXText const * text, BufferView const * bv)
 128 {
 129         if (cursor_visible_)
 130                 return;
 131
 132         workarea().getPainter().start();
 133
 134         Cursor_Shape shape = BAR_SHAPE;
 135         BufferParams const & bp(bv->buffer()->params);
 136         LyXFont const & realfont(text->real_current_font);
 137
 138         if (realfont.language() != bp.language
 139                 || realfont.isVisibleRightToLeft()
 140                 != bp.language->RightToLeft()) {
 141                 shape = (realfont.isVisibleRightToLeft())
 142                         ? REVERSED_L_SHAPE : L_SHAPE;
 143         }
 144
 145         showManualCursor(text, text->cursor.x(), text->cursor.y(),
 146                 font_metrics::maxAscent(realfont),
 147                 font_metrics::maxDescent(realfont),
 148                 shape);
 149
 150         workarea().getPainter().end();
 151 }
 152
 153
 154 bool LyXScreen::fitManualCursor(BufferView * bv, LyXText * text,
 155         int /*x*/, int y, int asc, int desc)
 156 {
 157         int const vheight = workarea().workHeight();
 158         int newtop = text->first_y;
 159
 160         if (y + desc - text->first_y >= vheight)
 161                 newtop = y - 3 * vheight / 4;  // the scroll region must be so big!!
 162         else if (y - asc < text->first_y
 163                 && text->first_y > 0) {
 164                 newtop = y - vheight / 4;
 165         }
 166
 167         newtop = max(newtop, 0); // can newtop ever be < 0? (Lgb)
 168
 169         if (newtop != text->first_y) {
 170                 draw(text, bv, newtop);
 171                 text->first_y = newtop;
 172                 return true;
 173         }
 174         return false;
 175 }
 176
 177
 178 void LyXScreen::cursorToggle(BufferView * bv) const
 179 {
 180         if (cursor_visible_)
 181                 bv->hideCursor();
 182         else
 183                 bv->showCursor();
 184 }
 185
 186
 187 unsigned int LyXScreen::topCursorVisible(LyXCursor const & cursor, int top_y)
 188 {
 189         int const vheight = workarea().workHeight();
 190         int newtop = top_y;
 191
 192         Row * row = cursor.row();
 193
 194         // Is this a hack? Yes, probably... (Lgb)
 195         if (!row)
 196                 return max(newtop, 0);
 197
 198         if (cursor.y() - row->baseline() + row->height() - top_y >= vheight) {
 199                 if (row->height() < vheight
 200                     && row->height() > vheight / 4) {
 201                         newtop = cursor.y()
 202                                 + row->height()
 203                                 - row->baseline() - vheight;
 204                 } else {
 205                         // scroll down
 206                         newtop = cursor.y()
 207                                 - vheight / 2;   /* the scroll region must be so big!! */
 208                 }
 209
 210         } else if (static_cast<int>((cursor.y()) - row->baseline()) <
 211                    top_y && top_y > 0) {
 212                 if (row->height() < vheight
 213                     && row->height() > vheight / 4) {
 214                         newtop = cursor.y() - row->baseline();
 215                 } else {
 216                         // scroll up
 217                         newtop = cursor.y() - vheight / 2;
 218                         newtop = min(newtop, top_y);
 219                 }
 220         }
 221
 222         newtop = max(newtop, 0);
 223
 224         return newtop;
 225 }
 226
 227
 228 bool LyXScreen::fitCursor(LyXText * text, BufferView * bv)
 229 {
 230         // Is a change necessary?
 231         int const newtop = topCursorVisible(text->cursor, text->first_y);
 232         bool const result = (newtop != text->first_y);
 233         if (result)
 234                 draw(text, bv, newtop);
 235         return result;
 236 }
 237
 238
 239 void LyXScreen::update(LyXText * text, BufferView * bv,
 240         int yo, int xo)
 241 {
 242         int const vwidth = workarea().workWidth();
 243         int const vheight = workarea().workHeight();
 244
 245         workarea().getPainter().start();
 246
 247         switch (text->status()) {
 248         case LyXText::NEED_MORE_REFRESH:
 249         {
 250                 int const y = max(int(text->refresh_y - text->first_y), 0);
 251                 drawFromTo(text, bv, y, vheight, yo, xo);
 252                 text->refresh_y = 0;
 253                 // otherwise this is called ONLY from BufferView_pimpl(update)
 254                 // or we should see to set this flag accordingly
 255                 if (text != bv->text)
 256                         text->status(bv, LyXText::UNCHANGED);
 257                 expose(0, y, vwidth, vheight - y);
 258         }
 259         break;
 260         case LyXText::NEED_VERY_LITTLE_REFRESH:
 261         {
 262                 // ok I will update the current cursor row
 263                 drawOneRow(text, bv, text->refresh_row, text->refresh_y,
 264                            yo, xo);
 265                 // this because if we had a major update the refresh_row could
 266                 // have been set to 0!
 267                 if (text->refresh_row) {
 268                         // otherwise this is called ONLY from BufferView_pimpl(update)
 269                         // or we should see to set this flag accordingly
 270                         if (text != bv->text)
 271                                 text->status(bv, LyXText::UNCHANGED);
 272                         expose(0, text->refresh_y - text->first_y + yo,
 273                                    vwidth, text->refresh_row->height());
 274                 }
 275         }
 276         break;
 277         case LyXText::CHANGED_IN_DRAW: // just to remove the warning
 278         case LyXText::UNCHANGED:
 279                 // Nothing needs done
 280                 break;
 281         }
 282
 283         workarea().getPainter().end();
 284 }
 285
 286
 287 void LyXScreen::toggleSelection(LyXText * text, BufferView * bv,
 288                                 bool kill_selection,
 289                                 int yo, int xo)
 290 {
 291         // only if there is a selection
 292         if (!text->selection.set()) return;
 293
 294         int const bottom = min(
 295                 max(static_cast<int>(text->selection.end.y()
 296                                      - text->selection.end.row()->baseline()
 297                                      + text->selection.end.row()->height()),
 298                     text->first_y),
 299                 static_cast<int>(text->first_y + workarea().workHeight()));
 300         int const top = min(
 301                 max(static_cast<int>(text->selection.start.y() -
 302                                      text->selection.start.row()->baseline()),
 303                     text->first_y),
 304                 static_cast<int>(text->first_y + workarea().workHeight()));
 305
 306         if (kill_selection)
 307                 text->selection.set(false);
 308
 309         workarea().getPainter().start();
 310
 311         drawFromTo(text, bv, top - text->first_y, bottom - text->first_y,
 312                    yo, xo);
 313         expose(0, top - text->first_y,
 314                workarea().workWidth(),
 315                bottom - text->first_y - (top - text->first_y));
 316
 317         workarea().getPainter().end();
 318 }
 319
 320
 321 void LyXScreen::toggleToggle(LyXText * text, BufferView * bv,
 322                              int yo, int xo)
 323 {
 324         if (text->toggle_cursor.par() == text->toggle_end_cursor.par()
 325             && text->toggle_cursor.pos() == text->toggle_end_cursor.pos())
 326                 return;
 327
 328         int const top_tmp = text->toggle_cursor.y()
 329                 - text->toggle_cursor.row()->baseline();
 330         int const bottom_tmp = text->toggle_end_cursor.y()
 331                 - text->toggle_end_cursor.row()->baseline()
 332                 + text->toggle_end_cursor.row()->height();
 333
 334         int const offset = yo < 0 ? yo : 0;
 335         int const bottom = min(max(bottom_tmp, text->first_y),
 336                 static_cast<int>(text->first_y + workarea().workHeight())) - offset;
 337         int const top = min(max(top_tmp, text->first_y),
 338                 static_cast<int>(text->first_y + workarea().workHeight())) - offset;
 339
 340         workarea().getPainter().start();
 341
 342         drawFromTo(text, bv, top - text->first_y,
 343                    bottom - text->first_y, yo,
 344                    xo);
 345         expose(0, top - text->first_y, workarea().workWidth(),
 346                bottom - text->first_y - (top - text->first_y));
 347
 348         workarea().getPainter().end();
 349 }
 350
 351
 352 void LyXScreen::redraw(LyXText * text, BufferView * bv)
 353 {
 354         workarea().getPainter().start();
 355
 356         if (!text) {
 357                 greyOut();
 358                 expose(0, 0, workarea().workWidth(), workarea().workHeight());
 359                 workarea().getPainter().end();
 360                 return;
 361         }
 362
 363         drawFromTo(text, bv, 0, workarea().workHeight(), 0, 0, text == bv->text);
 364         expose(0, 0, workarea().workWidth(), workarea().workHeight());
 365
 366         workarea().getPainter().end();
 367
 368         if (cursor_visible_) {
 369                 cursor_visible_ = false;
 370                 bv->showCursor();
 371         }
 372 }
 373
 374
 375 void LyXScreen::greyOut()
 376 {
 377         workarea().getPainter().fillRectangle(0, 0,
 378                 workarea().workWidth(),
 379                 workarea().workHeight(),
 380                 LColor::bottomarea);
 381
 382         // Add a splash screen to the centre of the work area
 383         SplashScreen const & splash = SplashScreen::get();
 384         grfx::Image const * const splash_image = splash.image();
 385         if (splash_image) {
 386                 int const w = splash_image->getWidth();
 387                 int const h = splash_image->getHeight();
 388
 389                 int x = (workarea().workWidth() - w) / 2;
 390                 int y = (workarea().workHeight() - h) / 2;
 391
 392                 workarea().getPainter().image(x, y, w, h, *splash_image);
 393
 394                 string const & splash_text  = splash.text();
 395                 LyXFont const & splash_font = splash.font();
 396
 397                 x += 260;
 398                 y += 265;
 399
 400                 workarea().getPainter().text(x, y, splash_text, splash_font);
 401         }
 402 }
 403
 404
 405 void LyXScreen::drawFromTo(LyXText * text, BufferView * bv,
 406         int y1, int y2, int yo, int xo,
 407         bool internal)
 408 {
 409         lyxerr[Debug::GUI] << "screen: drawFromTo " << y1 << "-" << y2 << endl;
 410
 411         int y_text = text->first_y + y1;
 412
 413         // get the first needed row
 414         Row * row = text->getRowNearY(y_text);
 415         // y_text is now the real beginning of the row
 416
 417         int y = y_text - text->first_y;
 418         // y1 is now the real beginning of row on the screen
 419
 420         while (row != 0 && y < y2) {
 421                 LyXText::text_status st = text->status();
 422                 text->getVisibleRow(bv, y + yo,
 423                                     xo, row, y + text->first_y);
 424                 internal = internal && (st != LyXText::CHANGED_IN_DRAW);
 425                 while (internal && text->status() == LyXText::CHANGED_IN_DRAW) {
 426                         text->fullRebreak(bv);
 427                         st = LyXText::NEED_MORE_REFRESH;
 428                         text->setCursor(bv, text->cursor.par(), text->cursor.pos());
 429                         text->status(bv, st);
 430                         text->getVisibleRow(bv, y + yo,
 431                                             xo, row, y + text->first_y);
 432                 }
 433                 y += row->height();
 434                 row = row->next();
 435         }
 436         force_clear_ = false;
 437
 438         // maybe we have to clear the screen at the bottom
 439         if ((y < y2) && text->bv_owner) {
 440                 workarea().getPainter().fillRectangle(0, y,
 441                         workarea().workWidth(), y2 - y,
 442                         LColor::bottomarea);
 443         }
 444 }
 445
 446
 447 void LyXScreen::drawOneRow(LyXText * text, BufferView * bv, Row * row,
 448         int y_text, int yo, int xo)
 449 {
 450         int const y = y_text - text->first_y + yo;
 451
 452         if (((y + row->height()) > 0) &&
 453             ((y - row->height()) <= static_cast<int>(workarea().workHeight()))) {
 454                 text->getVisibleRow(bv, y, xo, row, y + text->first_y);
 455         }
 456         force_clear_ = false;
 457 }