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