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