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