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