src/frontends/xforms/XWorkArea.C

   1 /**
   2  * \file XWorkArea.C
   3  * Copyright 1995-2002 the LyX Team
   4  * Read the file COPYING
   5  *
   6  * \author unknown
   7  * \author John Levon <moz@compsoc.man.ac.uk>
   8  */
   9
  10 #include <config.h>
  11
  12 #ifdef __GNUG__
  13 #pragma implementation
  14 #endif
  15
  16 #include "XWorkArea.h"
  17 #include "debug.h"
  18 #include "LyXView.h"
  19 #include "XLyXKeySym.h"
  20 #include "ColorHandler.h"
  21
  22 #if FL_VERSION < 1 && (FL_REVISION < 89 || (FL_REVISION == 89 && FL_FIXLEVEL < 5))
  23 #include "lyxlookup.h"
  24 #endif
  25
  26 #include "support/filetools.h" // LibFileSearch
  27 #include "support/lstrings.h"
  28 #include "support/LAssert.h"
  29
  30 #include <cmath>
  31 #include <cctype>
  32
  33 // xforms doesn't define this (but it should be in <forms.h>).
  34 extern "C"
  35 FL_APPEVENT_CB fl_set_preemptive_callback(Window, FL_APPEVENT_CB, void *);
  36
  37 using std::endl;
  38 using std::abs;
  39 using std::hex;
  40
  41 namespace {
  42
  43 inline
  44 void waitForX()
  45 {
  46         XSync(fl_get_display(), 0);
  47 }
  48
  49
  50 void setXtermCursor(Window win)
  51 {
  52         static Cursor cursor;
  53         static bool cursor_undefined = true;
  54         if (cursor_undefined) {
  55                 cursor = XCreateFontCursor(fl_get_display(), XC_xterm);
  56                 XFlush(fl_get_display());
  57                 cursor_undefined = false;
  58         }
  59         XDefineCursor(fl_get_display(), win, cursor);
  60         XFlush(fl_get_display());
  61 }
  62
  63
  64 // FIXME !
  65 mouse_button::state x_button_state(unsigned int button)
  66 {
  67         mouse_button::state b = mouse_button::none;
  68         switch (button) {
  69                 case Button1:
  70                         b = mouse_button::button1;
  71                         break;
  72                 case Button2:
  73                         b = mouse_button::button2;
  74                         break;
  75                 case Button3:
  76                         b = mouse_button::button3;
  77                         break;
  78                 case Button4:
  79                         b = mouse_button::button4;
  80                         break;
  81                 case Button5:
  82                         b = mouse_button::button5;
  83                         break;
  84                 default: // FIXME
  85                         break;
  86         }
  87         return b;
  88 }
  89
  90
  91 // FIXME
  92 mouse_button::state x_motion_state(unsigned int state)
  93 {
  94         mouse_button::state b = mouse_button::none;
  95         if (state & Button1MotionMask)
  96                 b |= mouse_button::button1;
  97         if (state & Button2MotionMask)
  98                 b |= mouse_button::button2;
  99         if (state & Button3MotionMask)
 100                 b |= mouse_button::button3;
 101         if (state & Button4MotionMask)
 102                 b |= mouse_button::button4;
 103         if (state & Button5MotionMask)
 104                 b |= mouse_button::button5;
 105         return b;
 106 }
 107
 108
 109 key_modifier::state x_key_state(unsigned int state)
 110 {
 111         key_modifier::state k = key_modifier::none;
 112         if (state & ControlMask)
 113                 k |= key_modifier::ctrl;
 114         if (state & ShiftMask)
 115                 k |= key_modifier::shift;
 116         if (state & Mod1Mask)
 117                 k |= key_modifier::alt;
 118         return k;
 119 }
 120
 121
 122 } // anon namespace
 123
 124
 125 extern "C" {
 126         // Just a bunch of C wrappers around static members of XWorkArea
 127         static
 128         void C_XWorkArea_scroll_cb(FL_OBJECT * ob, long)
 129         {
 130                 XWorkArea * area = static_cast<XWorkArea*>(ob->u_vdata);
 131                 area->scroll_cb();
 132         }
 133
 134
 135         static
 136         int C_XWorkArea_work_area_handler(FL_OBJECT * ob, int event,
 137                                          FL_Coord, FL_Coord,
 138                                          int key, void * xev)
 139         {
 140                 return XWorkArea::work_area_handler(ob, event,
 141                                                    0, 0, key, xev);
 142         }
 143
 144         static
 145         int C_XWorkAreaEventCB(FL_FORM * form, void * xev) {
 146                 XWorkArea * wa = static_cast<XWorkArea*>(form->u_vdata);
 147                 return wa->event_cb(static_cast<XEvent*>(xev));
 148         }
 149 }
 150
 151
 152 XWorkArea::XWorkArea(int x, int y, int w, int h)
 153         : workareapixmap(0), painter_(*this)
 154 {
 155         fl_freeze_all_forms();
 156
 157         FL_OBJECT * obj;
 158
 159         if (lyxerr.debugging(Debug::WORKAREA))
 160                 lyxerr << "\tbackground box: +"
 161                        << x << '+' << y << ' '
 162                        << w - 15 << 'x' << h << endl;
 163         backgroundbox = obj = fl_add_box(FL_BORDER_BOX,
 164                                          x, y,
 165                                          w - 15,
 166                                          h, "");
 167         fl_set_object_resize(obj, FL_RESIZE_ALL);
 168         fl_set_object_gravity(obj, NorthWestGravity, SouthEastGravity);
 169
 170         scrollbar = obj = fl_add_scrollbar(FL_VERT_SCROLLBAR,
 171                                            x + w - 15,
 172                                            y, 17, h, "");
 173         fl_set_object_boxtype(obj, FL_UP_BOX);
 174         fl_set_object_resize(obj, FL_RESIZE_ALL);
 175         fl_set_object_gravity(obj, NorthEastGravity, SouthEastGravity);
 176         obj->u_vdata = this;
 177         fl_set_object_callback(obj, C_XWorkArea_scroll_cb, 0);
 178         fl_set_scrollbar_bounds(scrollbar, 0.0, 0.0);
 179         fl_set_scrollbar_value(scrollbar, 0.0);
 180         fl_set_scrollbar_size(scrollbar, scrollbar->h);
 181
 182         int const bw = int(abs(fl_get_border_width()));
 183
 184         // Create the workarea pixmap
 185         createPixmap(w - 15 - 2 * bw, h - 2 * bw);
 186
 187         if (lyxerr.debugging(Debug::WORKAREA))
 188                 lyxerr << "\tfree object: +"
 189                        << x + bw << '+' << y + bw << ' '
 190                        << w - 15 - 2 * bw << 'x'
 191                        << h - 2 * bw << endl;
 192
 193         // We add this object as late as possible to avoid problems
 194         // with drawing.
 195         // FIXME: like ??
 196         work_area = obj = fl_add_free(FL_ALL_FREE,
 197                                       x + bw, y + bw,
 198                                       w - 15 - 2 * bw,
 199                                       h - 2 * bw, "",
 200                                       C_XWorkArea_work_area_handler);
 201         obj->wantkey = FL_KEY_ALL;
 202         obj->u_vdata = this;
 203
 204         fl_set_object_boxtype(obj,FL_DOWN_BOX);
 205         fl_set_object_resize(obj, FL_RESIZE_ALL);
 206         fl_set_object_gravity(obj, NorthWestGravity, SouthEastGravity);
 207
 208         /// X selection hook - xforms gets it wrong
 209         fl_current_form->u_vdata = this;
 210         fl_register_raw_callback(fl_current_form, FL_ALL_EVENT, C_XWorkAreaEventCB);
 211
 212         fl_unfreeze_all_forms();
 213 }
 214
 215
 216 XWorkArea::~XWorkArea()
 217 {
 218         if (workareapixmap)
 219                 XFreePixmap(fl_get_display(), workareapixmap);
 220 }
 221
 222
 223 namespace {
 224 void destroy_object(FL_OBJECT * obj)
 225 {
 226         if (!obj)
 227                 return;
 228
 229         if (obj->visible) {
 230                 fl_hide_object(obj);
 231         }
 232         fl_delete_object(obj);
 233         fl_free_object(obj);
 234 }
 235 } // namespace anon
 236
 237
 238 void XWorkArea::createPixmap(int width, int height)
 239 {
 240         static int cur_width = -1;
 241         static int cur_height = -1;
 242
 243         if (cur_width == width && cur_height == height && workareapixmap)
 244                 return;
 245
 246         cur_width = width;
 247         cur_height = height;
 248
 249         if (workareapixmap)
 250                 XFreePixmap(fl_get_display(), workareapixmap);
 251
 252         if (lyxerr.debugging(Debug::WORKAREA))
 253                 lyxerr << "Creating pixmap ("
 254                        << width << 'x' << height << ")" << endl;
 255
 256         workareapixmap = XCreatePixmap(fl_get_display(),
 257                                        RootWindow(fl_get_display(), 0),
 258                                        width,
 259                                        height,
 260                                        fl_get_visual_depth());
 261         if (lyxerr.debugging(Debug::WORKAREA))
 262                 lyxerr << "\tpixmap=" << workareapixmap << endl;
 263 }
 264
 265
 266 void XWorkArea::setScrollbarParams(int height, int pos, int line_height)
 267 {
 268         // we need to cache this for scroll_cb
 269         doc_height_ = height;
 270
 271         if (height == 0) {
 272                 fl_set_scrollbar_value(scrollbar, 0.0);
 273                 fl_set_scrollbar_size(scrollbar, scrollbar->h);
 274                 return;
 275         }
 276
 277         long const work_height = workHeight();
 278
 279         lyxerr[Debug::GUI] << "scroll: height now " << height << endl;
 280         lyxerr[Debug::GUI] << "scroll: work_height " << work_height << endl;
 281
 282         /* If the text is smaller than the working area, the scrollbar
 283          * maximum must be the working area height. No scrolling will
 284          * be possible */
 285         if (height <= work_height) {
 286                 lyxerr[Debug::GUI] << "scroll: doc smaller than workarea !" << endl;
 287                 fl_set_scrollbar_bounds(scrollbar, 0.0, 0.0);
 288                 fl_set_scrollbar_value(scrollbar, pos);
 289                 fl_set_scrollbar_size(scrollbar, scrollbar->h);
 290                 return;
 291         }
 292
 293         fl_set_scrollbar_bounds(scrollbar, 0.0, height - work_height);
 294         fl_set_scrollbar_increment(scrollbar, work_area->h - line_height, line_height);
 295
 296         fl_set_scrollbar_value(scrollbar, pos);
 297
 298         double const slider_size =
 299                 (height == 0) ? 1.0 : 1.0 / double(height);
 300
 301         fl_set_scrollbar_size(scrollbar, scrollbar->h * slider_size);
 302 }
 303
 304
 305 // callback for scrollbar slider
 306 void XWorkArea::scroll_cb()
 307 {
 308         double const val = fl_get_scrollbar_value(scrollbar);
 309         lyxerr[Debug::GUI] << "scroll: val: " << val << endl;
 310         lyxerr[Debug::GUI] << "scroll: height: " << scrollbar->h << endl;
 311         lyxerr[Debug::GUI] << "scroll: docheight: " << doc_height_ << endl;
 312         scrollDocView(int(val));
 313         waitForX();
 314 }
 315
 316
 317 int XWorkArea::work_area_handler(FL_OBJECT * ob, int event,
 318                                 FL_Coord, FL_Coord ,
 319                                 int key, void * xev)
 320 {
 321         static int x_old = -1;
 322         static int y_old = -1;
 323         static long scrollbar_value_old = -1;
 324
 325         XEvent * ev = static_cast<XEvent*>(xev);
 326         XWorkArea * area = static_cast<XWorkArea*>(ob->u_vdata);
 327
 328         if (!area) return 1;
 329
 330         switch (event) {
 331         case FL_DRAW:
 332                 if (!area->work_area ||
 333                     !area->work_area->form->visible)
 334                         return 1;
 335                 lyxerr[Debug::WORKAREA] << "Workarea event: DRAW" << endl;
 336                 area->createPixmap(area->workWidth(), area->workHeight());
 337                 area->workAreaResize();
 338                 area->redraw();
 339                 break;
 340         case FL_PUSH:
 341                 if (!ev || ev->xbutton.button == 0) break;
 342                 // Should really have used xbutton.state
 343                 lyxerr[Debug::WORKAREA] << "Workarea event: PUSH" << endl;
 344                 area->workAreaButtonPress(ev->xbutton.x - ob->x,
 345                                           ev->xbutton.y - ob->y,
 346                                           x_button_state(ev->xbutton.button));
 347                 break;
 348         case FL_RELEASE:
 349                 if (!ev || ev->xbutton.button == 0) break;
 350                 // Should really have used xbutton.state
 351                 lyxerr[Debug::WORKAREA] << "Workarea event: RELEASE" << endl;
 352                 area->workAreaButtonRelease(ev->xbutton.x - ob->x,
 353                                       ev->xbutton.y - ob->y,
 354                                       x_button_state(ev->xbutton.button));
 355                 break;
 356 #if FL_VERSION < 1 && FL_REVISION < 89
 357         case FL_MOUSE:
 358 #else
 359         case FL_DRAG:
 360 #endif
 361                 if (!ev || ! area->scrollbar) break;
 362                 if (ev->xmotion.x != x_old ||
 363                     ev->xmotion.y != y_old ||
 364                     fl_get_scrollbar_value(area->scrollbar) != scrollbar_value_old
 365                         ) {
 366                         lyxerr[Debug::WORKAREA] << "Workarea event: MOUSE" << endl;
 367                         area->workAreaMotionNotify(ev->xmotion.x - ob->x,
 368                                              ev->xmotion.y - ob->y,
 369                                              x_motion_state(ev->xbutton.state));
 370                 }
 371                 break;
 372 #if FL_VERSION < 1 && FL_REVISION < 89
 373         case FL_KEYBOARD:
 374 #else
 375         case FL_KEYPRESS:
 376 #endif
 377         {
 378                 lyxerr[Debug::WORKAREA] << "Workarea event: KEYBOARD" << endl;
 379
 380                 KeySym keysym = 0;
 381                 char dummy[1];
 382                 XKeyEvent * xke = reinterpret_cast<XKeyEvent *>(ev);
 383 #if FL_VERSION < 1 && (FL_REVISION < 89 || (FL_REVISION == 89 && FL_FIXLEVEL < 5))
 384                 // XForms < 0.89.5 does not have compose support
 385                 // so we are using our own compose support
 386                 LyXLookupString(ev, dummy, 1, &keysym);
 387 #else
 388                 XLookupString(xke, dummy, 1, &keysym, 0);
 389 //              int num_keys = XLookupString(xke, dummy, 10, &keysym, &xcs);
 390 //              lyxerr << "We have " << num_keys << " keys in the returned buffer" << endl;
 391 //              lyxerr << "Our dummy string is " << dummy << endl;
 392 #endif
 393
 394                 if (lyxerr.debugging(Debug::KEY)) {
 395                         char const * tmp = XKeysymToString(key);
 396                         char const * tmp2 = XKeysymToString(keysym);
 397                         string const stm = (tmp ? tmp : "");
 398                         string const stm2 = (tmp2 ? tmp2 : "");
 399
 400                         lyxerr[Debug::KEY] << "XWorkArea: Key is `" << stm << "' ["
 401                                << key << "]" << endl;
 402                         lyxerr[Debug::KEY] << "XWorkArea: Keysym is `" << stm2 << "' ["
 403                                << keysym << "]" << endl;
 404                 }
 405
 406 #if FL_VERSION < 1 && (FL_REVISION < 89 || (FL_REVISION == 89 && FL_FIXLEVEL < 5))
 407                 if (keysym == NoSymbol) {
 408                         lyxerr[Debug::KEY]
 409                                 << "Empty kdb action (probably composing)"
 410                                 << endl;
 411                         break;
 412                 }
 413                 KeySym ret_key = keysym;
 414 #else
 415                 // Note that we need this handling because of a bug
 416                 // in XForms 0.89, if this bug is resolved in the way I hope
 417                 // we can just use the keysym directly with out looking
 418                 // at key at all. (Lgb)
 419                 KeySym ret_key = 0;
 420                 if (!key) {
 421                         // We migth have to add more keysyms here also,
 422                         // we will do that as the issues arise. (Lgb)
 423                         if (keysym == XK_space) {
 424                                 ret_key = keysym;
 425                                 lyxerr[Debug::KEY] << "Using keysym [A]"
 426                                                    << endl;
 427                         } else
 428                                 break;
 429                 } else {
 430                         // It seems that this was a bit optimistic...
 431                         // With this hacking things seems to be better (Lgb)
 432                         //if (!iscntrl(key)) {
 433                         //      ret_key = key;
 434                         //      lyxerr[Debug::KEY]
 435                         //              << "Using key [B]\n"
 436                         //              << "Uchar["
 437                         //              << static_cast<unsigned char>(key)
 438                         //              << endl;
 439                         //} else {
 440                                 ret_key = (keysym ? keysym : key);
 441                                 lyxerr[Debug::KEY] << "Using keysym [B]"
 442                                                    << endl;
 443                                 //}
 444                 }
 445
 446 #endif
 447                 unsigned int const ret_state = xke->state;
 448
 449                 // If you have a better way to handle "wild-output" of
 450                 // characters after the key has been released than the one
 451                 // below, please contact me. (Lgb)
 452                 static Time last_time_pressed;
 453                 static unsigned int last_key_pressed;
 454                 static unsigned int last_state_pressed;
 455                 lyxerr[Debug::KEY] << "Workarea Diff: "
 456                                    << xke->time - last_time_pressed
 457                                    << endl;
 458                 if (xke->time - last_time_pressed < 25 // should perhaps be tunable
 459                     && ret_state == last_state_pressed
 460                     && xke->keycode == last_key_pressed) {
 461                         lyxerr[Debug::KEY]
 462                                 << "Workarea: Purging X events." << endl;
 463                         //lyxerr << "Workarea Events: "
 464                         //       << XEventsQueued(fl_get_display(), QueuedAlready)
 465                         //       << endl;
 466                         if (XEventsQueued(fl_get_display(), QueuedAlready) > 0)
 467                                 XSync(fl_get_display(), 1);
 468                         // This purge make f.ex. scrolling stop immidiatly when
 469                         // releasing the PageDown button. The question is if
 470                         // this purging of XEvents can cause any harm...
 471                         // after some testing I can see no problems, but
 472                         // I'd like other reports too.
 473                         break;
 474                 }
 475                 last_time_pressed = xke->time;
 476                 last_key_pressed = xke->keycode;
 477                 last_state_pressed = ret_state;
 478
 479                 XLyXKeySym * xlk = new XLyXKeySym;
 480                 xlk->initFromKeySym(ret_key);
 481
 482                 area->workAreaKeyPress(LyXKeySymPtr(xlk),
 483                                        x_key_state(ret_state));
 484         }
 485         break;
 486
 487 #if FL_VERSION > 0 || FL_REVISION >= 89
 488         case FL_KEYRELEASE:
 489                 lyxerr[Debug::WORKAREA] << "Workarea event: KEYRELEASE" << endl;
 490                 break;
 491 #endif
 492
 493         case FL_ENTER:
 494                 lyxerr[Debug::WORKAREA] << "Workarea event: ENTER" << endl;
 495                 break;
 496         case FL_LEAVE:
 497                 lyxerr[Debug::WORKAREA] << "Workarea event: LEAVE" << endl;
 498                 break;
 499         case FL_DBLCLICK:
 500                 if (!ev) break;
 501                 lyxerr[Debug::WORKAREA] << "Workarea event: DBLCLICK" << endl;
 502                 area->workAreaDoubleClick(ev->xbutton.x - ob->x,
 503                                           ev->xbutton.y - ob->y,
 504                                           x_button_state(ev->xbutton.button));
 505                 break;
 506         case FL_TRPLCLICK:
 507                 if (!ev) break;
 508                 lyxerr[Debug::WORKAREA] << "Workarea event: TRPLCLICK" << endl;
 509                 area->workAreaTripleClick(ev->xbutton.x - ob->x,
 510                                           ev->xbutton.y - ob->y,
 511                                           x_button_state(ev->xbutton.button));
 512                 break;
 513         case FL_OTHER:
 514                 if (!ev) break;
 515                 lyxerr[Debug::WORKAREA] << "Workarea event: OTHER" << endl;
 516                 break;
 517         }
 518
 519         return 1;
 520 }
 521
 522
 523 namespace {
 524
 525 string clipboard_selection;
 526 bool clipboard_read = false;
 527
 528 extern "C" {
 529
 530         static
 531         int request_clipboard_cb(FL_OBJECT * /*ob*/, long /*type*/,
 532                                  void const * data, long size)
 533         {
 534                 clipboard_selection.erase();
 535
 536                 if (size > 0)
 537                         clipboard_selection.reserve(size);
 538                 for (int i = 0; i < size; ++i)
 539                         clipboard_selection +=
 540                                 static_cast<char const *>(data)[i];
 541                 clipboard_read = true;
 542                 return 0;
 543         }
 544
 545 }
 546
 547 } // namespace anon
 548
 549
 550 int XWorkArea::event_cb(XEvent * xev)
 551 {
 552         int ret = 0;
 553         switch (xev->type) {
 554                 case SelectionRequest:
 555                         lyxerr[Debug::GUI] << "X requested selection." << endl;
 556                         selectionRequested();
 557                         break;
 558                 case SelectionClear:
 559                         lyxerr[Debug::GUI] << "Lost selection." << endl;
 560                         selectionLost();
 561                         break;
 562         }
 563         return ret;
 564 }
 565
 566
 567 void XWorkArea::haveSelection(bool yes) const
 568 {
 569         if (!yes) {
 570                 XSetSelectionOwner(fl_get_display(), XA_PRIMARY, None, CurrentTime);
 571                 return;
 572         }
 573
 574         XSetSelectionOwner(fl_get_display(), XA_PRIMARY, FL_ObjWin(work_area), CurrentTime);
 575 }
 576
 577
 578 string const XWorkArea::getClipboard() const
 579 {
 580         clipboard_read = false;
 581
 582         if (fl_request_clipboard(work_area, 0, request_clipboard_cb) == -1)
 583                 return string();
 584
 585         XEvent ev;
 586
 587         while (!clipboard_read) {
 588                 if (fl_check_forms() == FL_EVENT) {
 589                         fl_XNextEvent(&ev);
 590                         lyxerr << "Received unhandled X11 event" << endl;
 591                         lyxerr << "Type: 0x" << hex << ev.xany.type <<
 592                                 " Target: 0x" << hex << ev.xany.window << endl;
 593                 }
 594         }
 595         return clipboard_selection;
 596 }
 597
 598
 599 void XWorkArea::putClipboard(string const & s) const
 600 {
 601         static string hold;
 602         hold = s;
 603
 604         fl_stuff_clipboard(work_area, 0, hold.data(), hold.size(), 0);
 605 }