src/screen.C

   1 /* This file is part of
   2 * ======================================================
   3 *
   4 *           LyX, The Document Processor
   5 *
   6 *           Copyright 1995 Matthias Ettrich
   7 *           Copyright 1995-1998 The LyX Team
   8 *
   9 * ====================================================== */
  10
  11 #include <config.h>
  12
  13 #ifdef __GNUG__
  14 #pragma implementation "lyxscreen.h"
  15 #endif
  16
  17 #include <algorithm>
  18
  19 #include "lyxscreen.h"
  20 #include "lyxtext.h"
  21 #include "lyxrow.h"
  22 #include "Painter.h"
  23 #include "WorkArea.h"
  24 #include "buffer.h"
  25 #include "font.h"
  26 #include "insets/insettext.h"
  27 #include "ColorHandler.h"
  28
  29 using std::max;
  30 using std::min;
  31
  32 static
  33 GC createGC()
  34 {
  35         XGCValues val;
  36         val.foreground = BlackPixel(fl_get_display(),
  37                                     DefaultScreen(fl_get_display()));
  38
  39         val.function = GXcopy;
  40         val.graphics_exposures = false;
  41         val.line_style = LineSolid;
  42         val.line_width = 0;
  43         return XCreateGC(fl_get_display(), RootWindow(fl_get_display(), 0),
  44                          GCForeground | GCFunction | GCGraphicsExposures
  45                          | GCLineWidth | GCLineStyle , &val);
  46 }
  47
  48
  49 // Constructor
  50 LyXScreen::LyXScreen(WorkArea & o)
  51         : owner(o), force_clear(true)
  52 {
  53         // the cursor isnt yet visible
  54         cursor_visible = false;
  55         cursor_pixmap = 0;
  56         cursor_pixmap_x = 0;
  57         cursor_pixmap_y = 0;
  58         cursor_pixmap_w = 0;
  59         cursor_pixmap_h = 0;
  60
  61         // We need this GC
  62         gc_copy = createGC();
  63 }
  64
  65
  66 void LyXScreen::setCursorColor()
  67 {
  68         if (!lyxColorHandler) return;
  69
  70         GC gc = lyxColorHandler->getGCForeground(LColor::cursor);
  71
  72         XGCValues val;
  73         XGetGCValues(fl_get_display(),
  74                      gc, GCForeground, &val);
  75         XChangeGC(fl_get_display(), gc_copy, GCForeground, &val);
  76 }
  77
  78
  79 void LyXScreen::Redraw(LyXText * text, BufferView * bv)
  80 {
  81         DrawFromTo(text, bv, 0, owner.height());
  82         expose(0, 0, owner.workWidth(), owner.height());
  83         if (cursor_visible) {
  84                 cursor_visible = false;
  85                 ShowCursor(text, bv);
  86         }
  87 }
  88
  89
  90 void LyXScreen::expose(int x, int y, int exp_width, int exp_height)
  91 {
  92         XCopyArea(fl_get_display(),
  93                   owner.getPixmap(),
  94                   owner.getWin(),
  95                   gc_copy,
  96                   x, y,
  97                   exp_width, exp_height,
  98                   x + owner.xpos(),
  99                   y + owner.ypos());
 100 }
 101
 102
 103 void LyXScreen::DrawFromTo(LyXText * text, BufferView * bv,
 104                            int y1, int y2, int y_offset, int x_offset)
 105 {
 106         int y_text = text->first + y1;
 107
 108         // get the first needed row
 109         Row * row = text->GetRowNearY(y_text);
 110         // y_text is now the real beginning of the row
 111
 112         int y = y_text - text->first;
 113         // y1 is now the real beginning of row on the screen
 114
 115         while (row != 0 && y < y2) {
 116                 LyXText::text_status st = bv->text->status;
 117                 do {
 118                         bv->text->status = st;
 119 #if 0
 120                         text->GetVisibleRow(owner.owner(), y + y_offset,
 121                                             x_offset, row, y + text->first);
 122 #else
 123                         text->GetVisibleRow(bv, y + y_offset,
 124                                             x_offset, row, y + text->first);
 125 #endif
 126                 } while (bv->text->status == LyXText::CHANGED_IN_DRAW);
 127                 bv->text->status = st;
 128                 y += row->height();
 129                 row = row->next();
 130         }
 131         force_clear = false;
 132
 133         // maybe we have to clear the screen at the bottom
 134         if ((y < y2) && text->bv_owner) {
 135                 owner.getPainter().fillRectangle(0, y,
 136                                                  owner.workWidth(),
 137                                                  y2 - y,
 138                                                LColor::bottomarea);
 139         }
 140 }
 141
 142
 143 void LyXScreen::DrawOneRow(LyXText * text, BufferView * bv, Row * row,
 144                            int y_text, int y_offset, int x_offset)
 145 {
 146         int const y = y_text - text->first + y_offset;
 147
 148         if (((y + row->height()) > 0) &&
 149             ((y - row->height()) <= static_cast<int>(owner.height()))) {
 150                 // ok there is something visible
 151                 LyXText::text_status st = bv->text->status;
 152                 do {
 153                         bv->text->status = st;
 154 #if 0
 155                         text->GetVisibleRow(owner.owner(), y, x_offset, row,
 156                                             y + text->first);
 157 #else
 158                         text->GetVisibleRow(bv, y, x_offset, row,
 159                                             y + text->first);
 160 #endif
 161                 } while (bv->text->status == LyXText::CHANGED_IN_DRAW);
 162                 bv->text->status = st;
 163         }
 164         force_clear = false;
 165 }
 166
 167
 168 /* draws the screen, starting with textposition y. uses as much already
 169 * printed pixels as possible */
 170 void LyXScreen::Draw(LyXText * text, BufferView * bv, unsigned int y)
 171 {
 172         if (cursor_visible) HideCursor();
 173
 174         int const old_first = text->first;
 175         text->first = y;
 176
 177         // is any optimiziation possible?
 178         if ((y - old_first) < owner.height()
 179             && (old_first - y) < owner.height()) {
 180                 if (text->first < old_first) {
 181                         DrawFromTo(text, bv, 0, old_first - text->first);
 182                         XCopyArea (fl_get_display(),
 183                                    owner.getWin(),
 184                                    owner.getWin(),
 185                                    gc_copy,
 186                                    owner.xpos(),
 187                                    owner.ypos(),
 188                                    owner.workWidth(),
 189                                    owner.height() - old_first + text->first,
 190                                    owner.xpos(),
 191                                    owner.ypos() + old_first - text->first
 192                                 );
 193                         // expose the area drawn
 194                         expose(0, 0,
 195                                owner.workWidth(),
 196                                old_first - text->first);
 197                 } else  {
 198                         DrawFromTo(text, bv,
 199                                    owner.height() + old_first - text->first,
 200                                    owner.height());
 201                         XCopyArea (fl_get_display(),
 202                                    owner.getWin(),
 203                                    owner.getWin(),
 204                                    gc_copy,
 205                                    owner.xpos(),
 206                                    owner.ypos() + text->first - old_first,
 207                                    owner.workWidth(),
 208                                    owner.height() + old_first - text->first,
 209                                    owner.xpos(),
 210                                    owner.ypos());
 211                         // expose the area drawn
 212                         expose(0, owner.height() + old_first - text->first,
 213                                owner.workWidth(), text->first - old_first);
 214                 }
 215         } else {
 216                 // make a dumb new-draw
 217                 DrawFromTo(text, bv, 0, owner.height());
 218                 expose(0, 0, owner.workWidth(), owner.height());
 219         }
 220 }
 221
 222
 223 void LyXScreen::ShowCursor(LyXText const * text, BufferView const * bv)
 224 {
 225         if (!cursor_visible) {
 226                 Cursor_Shape shape = BAR_SHAPE;
 227 #if 0
 228                 if (text->real_current_font.language() !=
 229                     owner.owner()->buffer()->params.language
 230                     || text->real_current_font.isVisibleRightToLeft()
 231                     != owner.owner()->buffer()->params.language->RightToLeft())
 232 #else
 233                 if (text->real_current_font.language() !=
 234                     bv->buffer()->params.language
 235                     || text->real_current_font.isVisibleRightToLeft()
 236                     != bv->buffer()->params.language->RightToLeft())
 237 #endif
 238                         shape = (text->real_current_font.isVisibleRightToLeft())
 239                                 ? REVERSED_L_SHAPE : L_SHAPE;
 240                 ShowManualCursor(text, text->cursor.x(), text->cursor.y(),
 241                                  lyxfont::maxAscent(text->real_current_font),
 242                                  lyxfont::maxDescent(text->real_current_font),
 243                                  shape);
 244         }
 245 }
 246
 247
 248 /* returns true if first has changed, otherwise false */
 249 bool LyXScreen::FitManualCursor(LyXText * text, BufferView * bv,
 250                                 int /*x*/, int y, int asc, int desc)
 251 {
 252         int newtop = text->first;
 253
 254         if (y + desc - text->first >= static_cast<int>(owner.height()))
 255                 newtop = y - 3 * owner.height() / 4;  // the scroll region must be so big!!
 256         else if (y - asc < static_cast<int>(text->first)
 257                 && text->first > 0) {
 258                 newtop = y - owner.height() / 4;
 259         }
 260
 261         newtop = max(newtop, 0); // can newtop ever be < 0? (Lgb)
 262
 263         if (newtop != static_cast<int>(text->first)) {
 264                 Draw(text, bv, newtop);
 265                 text->first = newtop;
 266                 return true;
 267         }
 268         return false;
 269 }
 270
 271
 272 void LyXScreen::ShowManualCursor(LyXText const * text, int x, int y,
 273                                  int asc, int desc, Cursor_Shape shape)
 274 {
 275         // Update the cursor color.
 276         setCursorColor();
 277
 278         int const y1 = max(y - text->first - asc, 0);
 279         int const y_tmp = min(y - text->first + desc,
 280                               static_cast<int>(owner.height()));
 281
 282         // Secure against very strange situations
 283         int const y2 = max(y_tmp, y1);
 284
 285         if (cursor_pixmap){
 286                 XFreePixmap(fl_get_display(), cursor_pixmap);
 287                 cursor_pixmap = 0;
 288         }
 289
 290         if (y2 > 0 && y1 < int(owner.height())) {
 291                 cursor_pixmap_h = y2 - y1 + 1;
 292                 cursor_pixmap_y = y1;
 293
 294                 switch (shape) {
 295                 case BAR_SHAPE:
 296                         cursor_pixmap_w = 1;
 297                         cursor_pixmap_x = x;
 298                         break;
 299                 case L_SHAPE:
 300                         cursor_pixmap_w = cursor_pixmap_h/3;
 301                         cursor_pixmap_x = x;
 302                         break;
 303                 case REVERSED_L_SHAPE:
 304                         cursor_pixmap_w = cursor_pixmap_h/3;
 305                         cursor_pixmap_x = x - cursor_pixmap_w + 1;
 306                         break;
 307                 }
 308
 309                 cursor_pixmap =
 310                         XCreatePixmap (fl_get_display(),
 311                                        fl_root,
 312                                        cursor_pixmap_w,
 313                                        cursor_pixmap_h,
 314                                        fl_get_visual_depth());
 315                 XCopyArea (fl_get_display(),
 316                            owner.getWin(),
 317                            cursor_pixmap,
 318                            gc_copy,
 319                            owner.xpos() + cursor_pixmap_x,
 320                            owner.ypos() + cursor_pixmap_y,
 321                            cursor_pixmap_w,
 322                            cursor_pixmap_h,
 323                            0, 0);
 324                 XDrawLine(fl_get_display(),
 325                           owner.getWin(),
 326                           gc_copy,
 327                           x + owner.xpos(),
 328                           y1 + owner.ypos(),
 329                           x + owner.xpos(),
 330                           y2 + owner.ypos());
 331                 switch (shape) {
 332                 case BAR_SHAPE:
 333                         break;
 334                 case L_SHAPE:
 335                 case REVERSED_L_SHAPE:
 336                         int const rectangle_h = (cursor_pixmap_h + 10) / 20;
 337                         XFillRectangle(fl_get_display(),
 338                                        owner.getWin(),
 339                                        gc_copy,
 340                                        cursor_pixmap_x + owner.xpos(),
 341                                        y2 - rectangle_h + 1 + owner.ypos(),
 342                                        cursor_pixmap_w - 1, rectangle_h);
 343                         break;
 344                 }
 345
 346         }
 347         cursor_visible = true;
 348 }
 349
 350
 351 void LyXScreen::HideCursor()
 352 {
 353         if (!cursor_visible) return;
 354
 355         if (cursor_pixmap){
 356                 XCopyArea (fl_get_display(),
 357                            cursor_pixmap,
 358                            owner.getWin(),
 359                            gc_copy,
 360                            0, 0,
 361                            cursor_pixmap_w, cursor_pixmap_h,
 362                            cursor_pixmap_x + owner.xpos(),
 363                            cursor_pixmap_y + owner.ypos());
 364         }
 365         cursor_visible = false;
 366 }
 367
 368
 369 void LyXScreen::CursorToggle(LyXText const * text, BufferView const * bv)
 370 {
 371         if (cursor_visible)
 372                 HideCursor();
 373         else
 374                 ShowCursor(text, bv);
 375 }
 376
 377
 378 /* returns a new top so that the cursor is visible */
 379 unsigned int LyXScreen::TopCursorVisible(LyXText const * text)
 380 {
 381         int newtop = text->first;
 382
 383         if (text->cursor.y()
 384             - text->cursor.row()->baseline()
 385             + text->cursor.row()->height()
 386             - text->first >= owner.height()) {
 387                 if (text->cursor.row()->height() < owner.height()
 388                     && text->cursor.row()->height() > owner.height() / 4)
 389                         newtop = text->cursor.y()
 390                                 + text->cursor.row()->height()
 391                                 - text->cursor.row()->baseline() - owner.height();
 392                 else
 393                         newtop = text->cursor.y()
 394                                 - 3 * owner.height() / 4;   /* the scroll region must be so big!! */
 395         } else if (static_cast<int>((text->cursor.y()) - text->cursor.row()->baseline()) <
 396                    text->first && text->first > 0)
 397         {
 398                 if (text->cursor.row()->height() < owner.height()
 399                     && text->cursor.row()->height() > owner.height() / 4)
 400                         newtop = text->cursor.y() - text->cursor.row()->baseline();
 401                 else {
 402                         newtop = text->cursor.y() - owner.height() / 4;
 403                         newtop = min(newtop, int(text->first));
 404                 }
 405         }
 406
 407         newtop = max(newtop, 0);
 408
 409         return newtop;
 410 }
 411
 412
 413 /* scrolls the screen so that the cursor is visible, if necessary.
 414 * returns true if a change was made, otherwise false */
 415 bool LyXScreen::FitCursor(LyXText * text, BufferView * bv)
 416 {
 417         // Is a change necessary?
 418         int const newtop = TopCursorVisible(text);
 419         bool const result = (newtop != text->first);
 420         if (result)
 421                 Draw(text, bv, newtop);
 422         return result;
 423 }
 424
 425
 426 void LyXScreen::Update(LyXText * text, BufferView * bv,
 427                        int y_offset, int x_offset)
 428 {
 429         switch (text->status) {
 430         case LyXText::NEED_MORE_REFRESH:
 431         {
 432                 int const y = max(int(text->refresh_y - text->first), 0);
 433                 DrawFromTo(text, bv, y, owner.height(), y_offset, x_offset);
 434                 text->refresh_y = 0;
 435                 text->status = LyXText::UNCHANGED;
 436                 expose(0, y, owner.workWidth(), owner.height() - y);
 437         }
 438         break;
 439         case LyXText::NEED_VERY_LITTLE_REFRESH:
 440         {
 441                 // ok I will update the current cursor row
 442                 DrawOneRow(text, bv, text->refresh_row, text->refresh_y,
 443                            y_offset, x_offset);
 444                 text->status = LyXText::UNCHANGED;
 445                 expose(0, text->refresh_y - text->first + y_offset,
 446                        owner.workWidth(), text->refresh_row->height());
 447         }
 448         break;
 449         case LyXText::CHANGED_IN_DRAW: // just to remove the warning
 450         case LyXText::UNCHANGED:
 451                 // Nothing needs done
 452                 break;
 453         }
 454 }
 455
 456
 457 void LyXScreen::ToggleSelection(LyXText * text, BufferView * bv,
 458                                 bool kill_selection,
 459                                 int y_offset, int x_offset)
 460 {
 461         // only if there is a selection
 462         if (!text->selection) return;
 463
 464         int const bottom = min(
 465                 max(static_cast<int>(text->sel_end_cursor.y()
 466                                      - text->sel_end_cursor.row()->baseline()
 467                                      + text->sel_end_cursor.row()->height()),
 468                     text->first),
 469                 static_cast<int>(text->first + owner.height()));
 470         int const top = min(
 471                 max(static_cast<int>(text->sel_start_cursor.y() -
 472                                      text->sel_start_cursor.row()->baseline()),
 473                     text->first),
 474                 static_cast<int>(text->first + owner.height()));
 475
 476         if (kill_selection)
 477                 text->selection = 0;
 478         DrawFromTo(text, bv, top - text->first, bottom - text->first,
 479                    y_offset, x_offset);
 480         expose(0, top - text->first,
 481                owner.workWidth(),
 482                bottom - text->first - (top - text->first));
 483 }
 484
 485
 486 void LyXScreen::ToggleToggle(LyXText * text, BufferView * bv,
 487                              int y_offset, int x_offset)
 488 {
 489         if (text->toggle_cursor.par() == text->toggle_end_cursor.par()
 490             && text->toggle_cursor.pos() == text->toggle_end_cursor.pos())
 491                 return;
 492
 493         int const top_tmp = text->toggle_cursor.y()
 494                 - text->toggle_cursor.row()->baseline();
 495         int const bottom_tmp = text->toggle_end_cursor.y()
 496                 - text->toggle_end_cursor.row()->baseline()
 497                 + text->toggle_end_cursor.row()->height();
 498
 499         int const bottom = min(max(bottom_tmp, text->first),
 500                      static_cast<int>(text->first + owner.height()));
 501         int const top = min(max(top_tmp, text->first),
 502                   static_cast<int>(text->first + owner.height()));
 503
 504         DrawFromTo(text, bv, top - text->first, bottom - text->first, y_offset,
 505                    x_offset);
 506         expose(0, top - text->first, owner.workWidth(),
 507                bottom - text->first - (top - text->first));
 508 }