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