GnuBook/GnuBook.js

   1 /*
   2 Copyright(c)2008 Internet Archive. Software license AGPL version 3.
   3
   4 This file is part of GnuBook.
   5
   6     GnuBook is free software: you can redistribute it and/or modify
   7     it under the terms of the GNU Affero General Public License as published by
   8     the Free Software Foundation, either version 3 of the License, or
   9     (at your option) any later version.
  10
  11     GnuBook is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU Affero General Public License for more details.
  15
  16     You should have received a copy of the GNU Affero General Public License
  17     along with GnuBook.  If not, see <http://www.gnu.org/licenses/>.
  18
  19     The GnuBook source is hosted at http://github.com/openlibrary/bookreader/
  20
  21     archive.org cvs $Revision: 1.63 $ $Date: 2009-01-07 00:21:01 $
  22 */
  23
  24 // GnuBook()
  25 //______________________________________________________________________________
  26 // After you instantiate this object, you must supply the following
  27 // book-specific functions, before calling init():
  28 //  - getPageWidth()
  29 //  - getPageHeight()
  30 //  - getPageURI()
  31 // You must also add a numLeafs property before calling init().
  32
  33 function GnuBook() {
  34     this.reduce  = 4;
  35     this.padding = 10;
  36     this.mode    = 1; //1 or 2
  37
  38     this.displayedLeafs = [];
  39     //this.leafsToDisplay = [];
  40     this.imgs = {};
  41     this.prefetchedImgs = {}; //an object with numeric keys cooresponding to leafNum
  42
  43     this.timer     = null;
  44     this.animating = false;
  45     this.auto      = false;
  46     this.autoTimer = null;
  47     this.flipSpeed = 'fast';
  48
  49     this.twoPagePopUp = null;
  50     this.leafEdgeTmp  = null;
  51     this.embedPopup = null;
  52
  53     this.searchResults = {};
  54
  55     this.firstIndex = null;
  56
  57 };
  58
  59 // init()
  60 //______________________________________________________________________________
  61 GnuBook.prototype.init = function() {
  62     var startLeaf = window.location.hash;
  63     //console.log("startLeaf from location.hash: %s", startLeaf);
  64     if ('' == startLeaf) {
  65         if (this.titleLeaf) {
  66             startLeaf = "#" + this.leafNumToIndex(this.titleLeaf);
  67         }
  68     }
  69     var title = this.bookTitle.substr(0,50);
  70     if (this.bookTitle.length>50) title += '...';
  71
  72     // Ideally this would be set in the HTML/PHP for better search engine visibility but
  73     // it takes some time to locate the item and retrieve the metadata
  74     document.title = title;
  75
  76     $("#GnuBook").empty();
  77     $("#GnuBook").append("<div id='GBtoolbar'><span style='float:left;'><button class='GBicon' id='zoom_out' onclick='gb.zoom1up(-1); return false;'/> <button class='GBicon' id='zoom_in' onclick='gb.zoom1up(1); return false;'/> zoom: <span id='GBzoom'>25</span>% <button class='GBicon' id='script' onclick='gb.switchMode(1); return false;'/> <button class='GBicon' id='book_open' onclick='gb.switchMode(2); return false;'/>  &nbsp;&nbsp; <a href='"+this.bookUrl+"' target='_blank'>"+title+"</a></span></div>");
  78     $("#GBtoolbar").append("<span id='GBtoolbarbuttons' style='float: right'><button class='GBicon' id='page_code' onclick='gb.showEmbedCode(); return false;'/><form class='GBpageform' action='javascript:' onsubmit='gb.jumpToPage(this.elements[0].value)'> page:<input id='GBpagenum' type='text' size='3' onfocus='gb.autoStop();'></input></form> <button class='GBicon' id='book_previous' onclick='gb.prev(); return false;'/> <button class='GBicon' id='book_next' onclick='gb.next(); return false;'/> <button class='GBicon play' id='autoImg' onclick='gb.autoToggle(); return false;'/></span>");
  79     $("#GnuBook").append("<div id='GBcontainer'></div>");
  80     $("#GBcontainer").append("<div id='GBpageview'></div>");
  81
  82     $("#GBcontainer").bind('scroll', this, function(e) {
  83         e.data.loadLeafs();
  84     });
  85
  86     this.setupKeyListeners();
  87
  88     $(window).bind('resize', this, function(e) {
  89         //console.log('resize!');
  90         if (1 == e.data.mode) {
  91             //console.log('centering 1page view');
  92             e.data.centerPageView();
  93             $('#GBpageview').empty()
  94             e.data.displayedLeafs = [];
  95             e.data.updateSearchHilites(); //deletes hilights but does not call remove()
  96             e.data.loadLeafs();
  97         } else {
  98             //console.log('drawing 2 page view');
  99             e.data.prepareTwoPageView();
 100         }
 101     });
 102
 103     if (1 == this.mode) {
 104         this.resizePageView();
 105
 106         if ('' != startLeaf) { // Jump to the leaf specified in the URL
 107             this.jumpToIndex(parseInt(startLeaf.substr(1)));
 108             //console.log('jump to ' + parseInt(startLeaf.substr(1)));
 109         }
 110     } else {
 111         //this.resizePageView();
 112
 113         this.displayedLeafs=[0];
 114         if ('' != startLeaf) {
 115             this.displayedLeafs = [parseInt(startLeaf.substr(1))];
 116         }
 117         //console.log('titleLeaf: %d', this.titleLeaf);
 118         //console.log('displayedLeafs: %s', this.displayedLeafs);
 119         this.prepareTwoPageView();
 120         //if (this.auto) this.nextPage();
 121     }
 122 }
 123
 124 GnuBook.prototype.setupKeyListeners = function() {
 125     var self = this;
 126
 127     var KEY_PGUP = 33;
 128     var KEY_PGDOWN = 34;
 129     var KEY_END = 35;
 130     var KEY_HOME = 36;
 131
 132     var KEY_LEFT = 37;
 133     var KEY_UP = 38;
 134     var KEY_RIGHT = 39;
 135     var KEY_DOWN = 40;
 136
 137     // We use document here instead of window to avoid a bug in jQuery on IE7
 138     $(document).keydown(function(e) {
 139
 140         // Keyboard navigation
 141         switch(e.keyCode) {
 142             case KEY_PGUP:
 143                 // In 1up mode page scrolling is handled by browser
 144                 if (2 == self.mode) {
 145                     self.prev();
 146                 }
 147                 break;
 148             case KEY_PGDOWN:
 149                 if (2 == self.mode) {
 150                     self.next();
 151                 }
 152                 break;
 153             case KEY_END:
 154                 self.end();
 155                 break;
 156             case KEY_HOME:
 157                 self.home();
 158                 break;
 159             case KEY_UP:
 160             case KEY_LEFT:
 161                 if (self.keyboardNavigationIsDisabled(e)) {
 162                     break;
 163                 }
 164                 if (2 == self.mode) {
 165                     self.prev();
 166                 }
 167                 break;
 168             case KEY_DOWN:
 169             case KEY_RIGHT:
 170                 if (self.keyboardNavigationIsDisabled(e)) {
 171                     break;
 172                 }
 173                 if (2 == self.mode) {
 174                     self.next();
 175                 }
 176                 break;
 177         }
 178     });
 179 }
 180
 181 // drawLeafs()
 182 //______________________________________________________________________________
 183 GnuBook.prototype.drawLeafs = function() {
 184     if (1 == this.mode) {
 185         this.drawLeafsOnePage();
 186     } else {
 187         this.drawLeafsTwoPage();
 188     }
 189 }
 190
 191
 192 // drawLeafsOnePage()
 193 //______________________________________________________________________________
 194 GnuBook.prototype.drawLeafsOnePage = function() {
 195     //alert('drawing leafs!');
 196     this.timer = null;
 197
 198
 199     var scrollTop = $('#GBcontainer').attr('scrollTop');
 200     var scrollBottom = scrollTop + $('#GBcontainer').height();
 201     //console.log('top=' + scrollTop + ' bottom='+scrollBottom);
 202
 203     var leafsToDisplay = [];
 204
 205     var i;
 206     var leafTop = 0;
 207     var leafBottom = 0;
 208     for (i=0; i<this.numLeafs; i++) {
 209         var height  = parseInt(this.getPageHeight(i)/this.reduce);
 210
 211         leafBottom += height;
 212         //console.log('leafTop = '+leafTop+ ' pageH = ' + this.pageH[i] + 'leafTop>=scrollTop=' + (leafTop>=scrollTop));
 213         var topInView    = (leafTop >= scrollTop) && (leafTop <= scrollBottom);
 214         var bottomInView = (leafBottom >= scrollTop) && (leafBottom <= scrollBottom);
 215         var middleInView = (leafTop <=scrollTop) && (leafBottom>=scrollBottom);
 216         if (topInView | bottomInView | middleInView) {
 217             //console.log('to display: ' + i);
 218             leafsToDisplay.push(i);
 219         }
 220         leafTop += height +10;
 221         leafBottom += 10;
 222     }
 223
 224     var firstLeafToDraw  = leafsToDisplay[0];
 225     window.location.hash = firstLeafToDraw;
 226     this.firstIndex      = firstLeafToDraw;
 227
 228     if ((0 != firstLeafToDraw) && (1 < this.reduce)) {
 229         firstLeafToDraw--;
 230         leafsToDisplay.unshift(firstLeafToDraw);
 231     }
 232
 233     var lastLeafToDraw = leafsToDisplay[leafsToDisplay.length-1];
 234     if ( ((this.numLeafs-1) != lastLeafToDraw) && (1 < this.reduce) ) {
 235         leafsToDisplay.push(lastLeafToDraw+1);
 236     }
 237
 238     leafTop = 0;
 239     var i;
 240     for (i=0; i<firstLeafToDraw; i++) {
 241         leafTop += parseInt(this.getPageHeight(i)/this.reduce) +10;
 242     }
 243
 244     //var viewWidth = $('#GBpageview').width(); //includes scroll bar width
 245     var viewWidth = $('#GBcontainer').attr('scrollWidth');
 246
 247
 248     for (i=0; i<leafsToDisplay.length; i++) {
 249         var leafNum = leafsToDisplay[i];
 250         var height  = parseInt(this.getPageHeight(leafNum)/this.reduce);
 251
 252         if(-1 == jQuery.inArray(leafsToDisplay[i], this.displayedLeafs)) {
 253             var width   = parseInt(this.getPageWidth(leafNum)/this.reduce);
 254             //console.log("displaying leaf " + leafsToDisplay[i] + ' leafTop=' +leafTop);
 255             var div = document.createElement("div");
 256             div.className = 'GBpagediv1up';
 257             div.id = 'pagediv'+leafNum;
 258             div.style.position = "absolute";
 259             $(div).css('top', leafTop + 'px');
 260             var left = (viewWidth-width)>>1;
 261             if (left<0) left = 0;
 262             $(div).css('left', left+'px');
 263             $(div).css('width', width+'px');
 264             $(div).css('height', height+'px');
 265             //$(div).text('loading...');
 266
 267             $('#GBpageview').append(div);
 268
 269             var img = document.createElement("img");
 270             img.src = this.getPageURI(leafNum);
 271             $(img).css('width', width+'px');
 272             $(img).css('height', height+'px');
 273             $(div).append(img);
 274
 275         } else {
 276             //console.log("not displaying " + leafsToDisplay[i] + ' score=' + jQuery.inArray(leafsToDisplay[i], this.displayedLeafs));
 277         }
 278
 279         leafTop += height +10;
 280
 281     }
 282
 283     for (i=0; i<this.displayedLeafs.length; i++) {
 284         if (-1 == jQuery.inArray(this.displayedLeafs[i], leafsToDisplay)) {
 285             var leafNum = this.displayedLeafs[i];
 286             //console.log('Removing leaf ' + leafNum);
 287             //console.log('id='+'#pagediv'+leafNum+ ' top = ' +$('#pagediv'+leafNum).css('top'));
 288             $('#pagediv'+leafNum).remove();
 289         } else {
 290             //console.log('NOT Removing leaf ' + this.displayedLeafs[i]);
 291         }
 292     }
 293
 294     this.displayedLeafs = leafsToDisplay.slice();
 295     this.updateSearchHilites();
 296
 297     if (null != this.getPageNum(firstLeafToDraw))  {
 298         $("#GBpagenum").val(this.getPageNum(firstLeafToDraw));
 299     } else {
 300         $("#GBpagenum").val('');
 301     }
 302 }
 303
 304 // drawLeafsTwoPage()
 305 //______________________________________________________________________________
 306 GnuBook.prototype.drawLeafsTwoPage = function() {
 307     //alert('drawing two leafs!');
 308
 309     var scrollTop = $('#GBcontainer').attr('scrollTop');
 310     var scrollBottom = scrollTop + $('#GBcontainer').height();
 311     var leafNum = this.currentLeafL;
 312     var height  = this.getPageHeight(leafNum);
 313     var width   = this.getPageWidth(leafNum);
 314     var handSide= this.getPageSide(leafNum);
 315
 316     var leafEdgeWidthL = parseInt( (leafNum/this.numLeafs)*this.twoPageEdgeW );
 317     var leafEdgeWidthR = this.twoPageEdgeW - leafEdgeWidthL;
 318     var divWidth = this.twoPageW*2+20 + this.twoPageEdgeW;
 319     var divLeft = ($('#GBcontainer').width() - divWidth) >> 1;
 320     //console.log(leafEdgeWidthL);
 321
 322     var middle = ($('#GBcontainer').width() >> 1);
 323     var left = middle - this.twoPageW;
 324     var top  = ($('#GBcontainer').height() - this.twoPageH) >> 1;
 325
 326     var scaledW = parseInt(this.twoPageH*width/height);
 327     left = 10+leafEdgeWidthL;
 328     //var right = left+scaledW;
 329     var right = $(this.twoPageDiv).width()-11-$(this.leafEdgeL).width()-scaledW;
 330
 331     var gutter = middle+parseInt((2*this.currentLeafL - this.numLeafs)*this.twoPageEdgeW/this.numLeafs/2);
 332
 333
 334     this.prefetchImg(leafNum);
 335     $(this.prefetchedImgs[leafNum]).css({
 336         position: 'absolute',
 337         /*right:   gutter+'px',*/
 338         left: gutter-scaledW+'px',
 339         top:    top+'px',
 340         backgroundColor: 'rgb(234, 226, 205)',
 341         height: this.twoPageH +'px',
 342         width:  scaledW + 'px',
 343         borderRight: '1px solid black',
 344         zIndex: 2
 345     }).appendTo('#GBcontainer');
 346     //$('#GBcontainer').append(this.prefetchedImgs[leafNum]);
 347
 348
 349     var leafNum = this.currentLeafR;
 350     var height  = this.getPageHeight(leafNum);
 351     var width   = this.getPageWidth(leafNum);
 352     //    var left = ($('#GBcontainer').width() >> 1);
 353     left += scaledW;
 354
 355     var scaledW = this.twoPageH*width/height;
 356     this.prefetchImg(leafNum);
 357     $(this.prefetchedImgs[leafNum]).css({
 358         position: 'absolute',
 359         left:   gutter+'px',
 360         top:    top+'px',
 361         backgroundColor: 'rgb(234, 226, 205)',
 362         height: this.twoPageH + 'px',
 363         width:  scaledW + 'px',
 364         borderLeft: '1px solid black',
 365         zIndex: 2
 366     }).appendTo('#GBcontainer');
 367     //$('#GBcontainer').append(this.prefetchedImgs[leafNum]);
 368
 369
 370     this.displayedLeafs = [this.currentLeafL, this.currentLeafR];
 371     this.setClickHandlers();
 372
 373     this.updatePageNumBox2UP();
 374 }
 375
 376 // updatePageNumBox2UP
 377 //______________________________________________________________________________
 378 GnuBook.prototype.updatePageNumBox2UP = function() {
 379     if (null != this.getPageNum(this.currentLeafL))  {
 380         $("#GBpagenum").val(this.getPageNum(this.currentLeafL));
 381     } else {
 382         $("#GBpagenum").val('');
 383     }
 384     window.location.hash = this.currentLeafL;
 385 }
 386
 387 // loadLeafs()
 388 //______________________________________________________________________________
 389 GnuBook.prototype.loadLeafs = function() {
 390
 391
 392     var self = this;
 393     if (null == this.timer) {
 394         this.timer=setTimeout(function(){self.drawLeafs()},250);
 395     } else {
 396         clearTimeout(this.timer);
 397         this.timer=setTimeout(function(){self.drawLeafs()},250);
 398     }
 399 }
 400
 401
 402 // zoom1up()
 403 //______________________________________________________________________________
 404 GnuBook.prototype.zoom1up = function(dir) {
 405     if (2 == this.mode) {     //can only zoom in 1-page mode
 406         this.switchMode(1);
 407         return;
 408     }
 409
 410     if (1 == dir) {
 411         if (this.reduce <= 0.5) return;
 412         this.reduce*=0.5;           //zoom in
 413     } else {
 414         if (this.reduce >= 8) return;
 415         this.reduce*=2;             //zoom out
 416     }
 417
 418     this.resizePageView();
 419
 420     $('#GBpageview').empty()
 421     this.displayedLeafs = [];
 422     this.loadLeafs();
 423
 424     $('#GBzoom').text(100/this.reduce);
 425 }
 426
 427
 428 // resizePageView()
 429 //______________________________________________________________________________
 430 GnuBook.prototype.resizePageView = function() {
 431     var i;
 432     var viewHeight = 0;
 433     //var viewWidth  = $('#GBcontainer').width(); //includes scrollBar
 434     var viewWidth  = $('#GBcontainer').attr('clientWidth');
 435
 436     var oldScrollTop  = $('#GBcontainer').attr('scrollTop');
 437     var oldViewHeight = $('#GBpageview').height();
 438     if (0 != oldViewHeight) {
 439         var scrollRatio = oldScrollTop / oldViewHeight;
 440     } else {
 441         var scrollRatio = 0;
 442     }
 443
 444     for (i=0; i<this.numLeafs; i++) {
 445         viewHeight += parseInt(this.getPageHeight(i)/this.reduce) + this.padding;
 446         var width = parseInt(this.getPageWidth(i)/this.reduce);
 447         if (width>viewWidth) viewWidth=width;
 448     }
 449     $('#GBpageview').height(viewHeight);
 450     $('#GBpageview').width(viewWidth);
 451
 452     $('#GBcontainer').attr('scrollTop', Math.floor(scrollRatio*viewHeight));
 453
 454     this.centerPageView();
 455     this.loadLeafs();
 456
 457 }
 458
 459 // centerPageView()
 460 //______________________________________________________________________________
 461 GnuBook.prototype.centerPageView = function() {
 462
 463     var scrollWidth  = $('#GBcontainer').attr('scrollWidth');
 464     var clientWidth  =  $('#GBcontainer').attr('clientWidth');
 465     //console.log('sW='+scrollWidth+' cW='+clientWidth);
 466     if (scrollWidth > clientWidth) {
 467         $('#GBcontainer').attr('scrollLeft', (scrollWidth-clientWidth)/2);
 468     }
 469
 470 }
 471
 472 // jumpToPage()
 473 //______________________________________________________________________________
 474 GnuBook.prototype.jumpToPage = function(pageNum) {
 475     //if (2 == this.mode) return;
 476
 477     var i;
 478     var foundPage = false;
 479     var foundLeaf = null;
 480     for (i=0; i<this.numLeafs; i++) {
 481         if (this.getPageNum(i) == pageNum) {
 482             foundPage = true;
 483             foundLeaf = i;
 484             break;
 485         }
 486     }
 487
 488     if (foundPage) {
 489         var leafTop = 0;
 490         var h;
 491         this.jumpToIndex(foundLeaf);
 492         $('#GBcontainer').attr('scrollTop', leafTop);
 493     } else {
 494         alert('Page not found. This book might not have pageNumbers in scandata.');
 495     }
 496 }
 497
 498 // jumpToIndex()
 499 //______________________________________________________________________________
 500 GnuBook.prototype.jumpToIndex = function(index) {
 501     if (2 == this.mode) {
 502         this.autoStop();
 503         if (index<this.currentLeafL) {
 504             if ('L' == this.getPageSide(index)) {
 505                 this.flipBackToIndex(index);
 506             } else {
 507                 this.flipBackToIndex(index-1);
 508             }
 509         } else if (index>this.currentLeafR) {
 510             if ('R' == this.getPageSide(index)) {
 511                 this.flipFwdToIndex(index);
 512             } else {
 513                 this.flipFwdToIndex(index+1);
 514             }
 515         }
 516
 517     } else {
 518         var i;
 519         var leafTop = 0;
 520         var h;
 521         for (i=0; i<index; i++) {
 522             h = parseInt(this.getPageHeight(i)/this.reduce);
 523             leafTop += h + this.padding;
 524         }
 525         //$('#GBcontainer').attr('scrollTop', leafTop);
 526         $('#GBcontainer').animate({scrollTop: leafTop },'fast');
 527     }
 528 }
 529
 530
 531
 532 // switchMode()
 533 //______________________________________________________________________________
 534 GnuBook.prototype.switchMode = function(mode) {
 535     if (mode == this.mode) return;
 536
 537     this.autoStop();
 538     this.removeSearchHilites();
 539
 540     this.mode = mode;
 541     if (1 == mode) {
 542         this.prepareOnePageView();
 543     } else {
 544         this.prepareTwoPageView();
 545     }
 546
 547 }
 548
 549 //prepareOnePageView()
 550 //______________________________________________________________________________
 551 GnuBook.prototype.prepareOnePageView = function() {
 552
 553     var startLeaf = this.displayedLeafs[0];
 554
 555     $('#GBcontainer').empty();
 556     $('#GBcontainer').css({
 557         overflowY: 'scroll',
 558         overflowX: 'auto'
 559     });
 560
 561     $("#GBcontainer").append("<div id='GBpageview'></div>");
 562     this.resizePageView();
 563     this.jumpToIndex(startLeaf);
 564     this.displayedLeafs = [];
 565     this.drawLeafsOnePage();
 566     $('#GBzoom').text(100/this.reduce);
 567 }
 568
 569 // prepareTwoPageView()
 570 //______________________________________________________________________________
 571 GnuBook.prototype.prepareTwoPageView = function() {
 572     $('#GBcontainer').empty();
 573
 574     var firstLeaf = this.displayedLeafs[0];
 575     if ('R' == this.getPageSide(firstLeaf)) {
 576         if (0 == firstLeaf) {
 577             firstLeaf++;
 578         } else {
 579             firstLeaf--;
 580         }
 581     }
 582
 583     this.currentLeafL = null;
 584     this.currentLeafR = null;
 585     this.pruneUnusedImgs();
 586
 587     this.currentLeafL = firstLeaf;
 588     this.currentLeafR = firstLeaf + 1;
 589
 590     this.calculateSpreadSize(); //sets this.twoPageW, twoPageH, and twoPageRatio
 591
 592     var middle = ($('#GBcontainer').width() >> 1);
 593     var gutter = middle+parseInt((2*this.currentLeafL - this.numLeafs)*this.twoPageEdgeW/this.numLeafs/2);
 594     var scaledWL = this.getPageWidth2UP(this.currentLeafL);
 595     var scaledWR = this.getPageWidth2UP(this.currentLeafR);
 596     var leafEdgeWidthL = parseInt( (firstLeaf/this.numLeafs)*this.twoPageEdgeW );
 597     var leafEdgeWidthR = this.twoPageEdgeW - leafEdgeWidthL;
 598
 599     //console.log('idealWidth='+idealWidth+' idealHeight='+idealHeight);
 600     //var divWidth = this.twoPageW*2+20 + this.twoPageEdgeW;
 601     var divWidth = scaledWL + scaledWR + 20 + this.twoPageEdgeW;
 602     var divHeight = this.twoPageH+20;
 603     //var divLeft = ($('#GBcontainer').width() - divWidth) >> 1;
 604     var divLeft = gutter-scaledWL-leafEdgeWidthL-10;
 605     var divTop = ($('#GBcontainer').height() - divHeight) >> 1;
 606     //console.log('divWidth='+divWidth+' divHeight='+divHeight+ ' divLeft='+divLeft+' divTop='+divTop);
 607
 608     this.twoPageDiv = document.createElement('div');
 609     $(this.twoPageDiv).attr('id', 'book_div_1').css({
 610         border: '1px solid rgb(68, 25, 17)',
 611         width:  divWidth + 'px',
 612         height: divHeight+'px',
 613         visibility: 'visible',
 614         position: 'absolute',
 615         backgroundColor: 'rgb(136, 51, 34)',
 616         left: divLeft + 'px',
 617         top: divTop+'px',
 618         MozBorderRadiusTopleft: '7px',
 619         MozBorderRadiusTopright: '7px',
 620         MozBorderRadiusBottomright: '7px',
 621         MozBorderRadiusBottomleft: '7px'
 622     }).appendTo('#GBcontainer');
 623     //$('#GBcontainer').append('<div id="book_div_1" style="border: 1px solid rgb(68, 25, 17); width: ' + divWidth + 'px; height: '+divHeight+'px; visibility: visible; position: absolute; background-color: rgb(136, 51, 34); left: ' + divLeft + 'px; top: '+divTop+'px; -moz-border-radius-topleft: 7px; -moz-border-radius-topright: 7px; -moz-border-radius-bottomright: 7px; -moz-border-radius-bottomleft: 7px;"/>');
 624
 625
 626     var height  = this.getPageHeight(this.currentLeafR);
 627     var width   = this.getPageWidth(this.currentLeafR);
 628     var scaledW = this.twoPageH*width/height;
 629
 630     this.leafEdgeR = document.createElement('div');
 631     $(this.leafEdgeR).css({
 632         borderStyle: 'solid solid solid none',
 633         borderColor: 'rgb(51, 51, 34)',
 634         borderWidth: '1px 1px 1px 0px',
 635         background: 'transparent url(http://www.us.archive.org/GnuBook/images/right-edges.png) repeat scroll 0% 0%',
 636         width: leafEdgeWidthR + 'px',
 637         height: this.twoPageH-1 + 'px',
 638         /*right: '10px',*/
 639         left: gutter+scaledW+'px',
 640         top: divTop+10+'px',
 641         position: 'absolute'
 642     }).appendTo('#GBcontainer');
 643
 644     this.leafEdgeL = document.createElement('div');
 645     $(this.leafEdgeL).css({
 646         borderStyle: 'solid none solid solid',
 647         borderColor: 'rgb(51, 51, 34)',
 648         borderWidth: '1px 0px 1px 1px',
 649         background: 'transparent url(http://www.us.archive.org/GnuBook/images/left-edges.png) repeat scroll 0% 0%',
 650         width: leafEdgeWidthL + 'px',
 651         height: this.twoPageH-1 + 'px',
 652         left: divLeft+10+'px',
 653         top: divTop+10+'px',
 654         position: 'absolute'
 655     }).appendTo('#GBcontainer');
 656
 657
 658
 659     divWidth = 30;
 660     divHeight = this.twoPageH+20;
 661     divLeft = ($('#GBcontainer').width() - divWidth) >> 1;
 662     divTop = ($('#GBcontainer').height() - divHeight) >> 1;
 663
 664     div = document.createElement('div');
 665     $(div).attr('id', 'book_div_2').css({
 666         border:          '1px solid rgb(68, 25, 17)',
 667         width:           divWidth+'px',
 668         height:          divHeight+'px',
 669         position:        'absolute',
 670         backgroundColor: 'rgb(68, 25, 17)',
 671         left:            divLeft+'px',
 672         top:             divTop+'px'
 673     }).appendTo('#GBcontainer');
 674     //$('#GBcontainer').append('<div id="book_div_2" style="border: 1px solid rgb(68, 25, 17); width: '+divWidth+'px; height: '+divHeight+'px; visibility: visible; position: absolute; background-color: rgb(68, 25, 17); left: '+divLeft+'px; top: '+divTop+'px;"/>');
 675
 676     divWidth = this.twoPageW*2;
 677     divHeight = this.twoPageH;
 678     divLeft = ($('#GBcontainer').width() - divWidth) >> 1;
 679     divTop = ($('#GBcontainer').height() - divHeight) >> 1;
 680
 681
 682     this.prepareTwoPagePopUp();
 683
 684     this.displayedLeafs = [];
 685     //this.leafsToDisplay=[firstLeaf, firstLeaf+1];
 686     //console.log('leafsToDisplay: ' + this.leafsToDisplay[0] + ' ' + this.leafsToDisplay[1]);
 687     this.drawLeafsTwoPage();
 688     this.updateSearchHilites2UP();
 689
 690     this.prefetch();
 691     $('#GBzoom').text((100*this.twoPageH/this.getPageHeight(firstLeaf)).toString().substr(0,4));
 692 }
 693
 694 // prepareTwoPagePopUp()
 695 //______________________________________________________________________________
 696 GnuBook.prototype.prepareTwoPagePopUp = function() {
 697     this.twoPagePopUp = document.createElement('div');
 698     $(this.twoPagePopUp).css({
 699         border: '1px solid black',
 700         padding: '2px 6px',
 701         position: 'absolute',
 702         fontFamily: 'sans-serif',
 703         fontSize: '14px',
 704         zIndex: '1000',
 705         backgroundColor: 'rgb(255, 255, 238)',
 706         opacity: 0.85
 707     }).appendTo('#GBcontainer');
 708     $(this.twoPagePopUp).hide();
 709
 710     $(this.leafEdgeL).add(this.leafEdgeR).bind('mouseenter', this, function(e) {
 711         $(e.data.twoPagePopUp).show();
 712     });
 713
 714     $(this.leafEdgeL).add(this.leafEdgeR).bind('mouseleave', this, function(e) {
 715         $(e.data.twoPagePopUp).hide();
 716     });
 717
 718     $(this.leafEdgeL).bind('click', this, function(e) {
 719         e.data.autoStop();
 720         var jumpIndex = e.data.currentLeafL - ($(e.data.leafEdgeL).offset().left + $(e.data.leafEdgeL).width() - e.pageX) * 10;
 721         jumpIndex = Math.max(jumpIndex, 0);
 722         e.data.flipBackToIndex(jumpIndex);
 723
 724     });
 725
 726     $(this.leafEdgeR).bind('click', this, function(e) {
 727         e.data.autoStop();
 728         var jumpIndex = e.data.currentLeafR + (e.pageX - $(e.data.leafEdgeR).offset().left) * 10;
 729         jumpIndex = Math.max(jumpIndex, 0);
 730         e.data.flipFwdToIndex(jumpIndex);
 731
 732     });
 733
 734     $(this.leafEdgeR).bind('mousemove', this, function(e) {
 735
 736         var jumpLeaf = e.data.currentLeafR + (e.pageX - $(e.data.leafEdgeR).offset().left) * 10;
 737         jumpLeaf = Math.min(jumpLeaf, e.data.numLeafs-1);
 738         $(e.data.twoPagePopUp).text('View Leaf '+jumpLeaf);
 739
 740         $(e.data.twoPagePopUp).css({
 741             left: e.pageX +5+ 'px',
 742             top: e.pageY-$('#GBcontainer').offset().top+ 'px'
 743         });
 744     });
 745
 746     $(this.leafEdgeL).bind('mousemove', this, function(e) {
 747         var jumpLeaf = e.data.currentLeafL - ($(e.data.leafEdgeL).offset().left + $(e.data.leafEdgeL).width() - e.pageX) * 10;
 748         jumpLeaf = Math.max(jumpLeaf, 0);
 749         $(e.data.twoPagePopUp).text('View Leaf '+jumpLeaf);
 750
 751         $(e.data.twoPagePopUp).css({
 752             left: e.pageX - $(e.data.twoPagePopUp).width() - 30 + 'px',
 753             top: e.pageY-$('#GBcontainer').offset().top+ 'px'
 754         });
 755     });
 756 }
 757
 758 // calculateSpreadSize()
 759 //______________________________________________________________________________
 760 // Calculates 2-page spread dimensions based on this.currentLeafL and
 761 // this.currentLeafR
 762 // This function sets this.twoPageH, twoPageW, and twoPageRatio
 763
 764 GnuBook.prototype.calculateSpreadSize = function() {
 765     var firstLeaf  = this.currentLeafL;
 766     var secondLeaf = this.currentLeafR;
 767     //console.log('first page is ' + firstLeaf);
 768
 769     var canon5Dratio = 1.5;
 770
 771     var firstLeafRatio  = this.getPageHeight(firstLeaf) / this.getPageWidth(firstLeaf);
 772     var secondLeafRatio = this.getPageHeight(secondLeaf) / this.getPageWidth(secondLeaf);
 773     //console.log('firstLeafRatio = ' + firstLeafRatio + ' secondLeafRatio = ' + secondLeafRatio);
 774
 775     var ratio;
 776     if (Math.abs(firstLeafRatio - canon5Dratio) < Math.abs(secondLeafRatio - canon5Dratio)) {
 777         ratio = firstLeafRatio;
 778         //console.log('using firstLeafRatio ' + ratio);
 779     } else {
 780         ratio = secondLeafRatio;
 781         //console.log('using secondLeafRatio ' + ratio);
 782     }
 783
 784     var totalLeafEdgeWidth = parseInt(this.numLeafs * 0.1);
 785     var maxLeafEdgeWidth   = parseInt($('#GBcontainer').width() * 0.1);
 786     totalLeafEdgeWidth     = Math.min(totalLeafEdgeWidth, maxLeafEdgeWidth);
 787
 788     $('#GBcontainer').css('overflow', 'hidden');
 789
 790     var idealWidth  = ($('#GBcontainer').width() - 30 - totalLeafEdgeWidth)>>1;
 791     var idealHeight = $('#GBcontainer').height() - 30;
 792     //console.log('init idealWidth='+idealWidth+' idealHeight='+idealHeight + ' ratio='+ratio);
 793
 794     if (idealHeight/ratio <= idealWidth) {
 795         //use height
 796         idealWidth = parseInt(idealHeight/ratio);
 797     } else {
 798         //use width
 799         idealHeight = parseInt(idealWidth*ratio);
 800     }
 801
 802     this.twoPageH     = idealHeight;
 803     this.twoPageW     = idealWidth;
 804     this.twoPageRatio = ratio;
 805     this.twoPageEdgeW = totalLeafEdgeWidth;
 806
 807 }
 808
 809 // next()
 810 //______________________________________________________________________________
 811 GnuBook.prototype.next = function() {
 812     if (2 == this.mode) {
 813         this.autoStop();
 814         this.flipFwdToIndex(null);
 815     } else {
 816         if (this.firstIndex <= (this.numLeafs - 2)) {
 817             this.jumpToIndex(this.firstIndex+1);
 818         }
 819     }
 820 }
 821
 822 // prev()
 823 //______________________________________________________________________________
 824 GnuBook.prototype.prev = function() {
 825     if (2 == this.mode) {
 826         this.autoStop();
 827         this.flipBackToIndex(null);
 828     } else {
 829         if (this.firstIndex >= 1) {
 830             this.jumpToIndex(this.firstIndex-1);
 831         }
 832     }
 833 }
 834
 835 GnuBook.prototype.home = function() {
 836     if (2 == this.mode) {
 837         this.jumpToIndex(2);
 838     }
 839     else {
 840         this.jumpToIndex(0);
 841     }
 842 }
 843
 844 GnuBook.prototype.end = function() {
 845     if (2 == this.mode) {
 846         this.jumpToIndex(this.numLeafs-5);
 847     }
 848     else {
 849         this.jumpToIndex(this.numLeafs-1);
 850     }
 851 }
 852
 853 // flipBackToIndex()
 854 //______________________________________________________________________________
 855 // to flip back one spread, pass index=null
 856 GnuBook.prototype.flipBackToIndex = function(index) {
 857     if (1 == this.mode) return;
 858
 859     var leftIndex = this.currentLeafL;
 860     if (leftIndex <= 2) return;
 861     if (this.animating) return;
 862
 863     if (null != this.leafEdgeTmp) {
 864         alert('error: leafEdgeTmp should be null!');
 865         return;
 866     }
 867
 868     if (null == index) {
 869         index = leftIndex-2;
 870     }
 871     if (index<0) return;
 872
 873     if ('L' !=  this.getPageSide(index)) {
 874         alert('img with index ' + index + ' is not a left-hand page');
 875         return;
 876     }
 877
 878     this.animating = true;
 879
 880     var prevL = index;
 881     var prevR = index+1;
 882
 883     var gutter= this.prepareFlipBack(prevL, prevR);
 884
 885     var leftLeaf = this.currentLeafL;
 886
 887     var oldLeafEdgeWidthL = parseInt( (this.currentLeafL/this.numLeafs)*this.twoPageEdgeW );
 888     var newLeafEdgeWidthL = parseInt( (index            /this.numLeafs)*this.twoPageEdgeW );
 889     var leafEdgeTmpW = oldLeafEdgeWidthL - newLeafEdgeWidthL;
 890
 891     var scaledWL = this.getPageWidth2UP(prevL);
 892
 893     var top  = ($('#GBcontainer').height() - this.twoPageH) >> 1;
 894
 895     this.leafEdgeTmp = document.createElement('div');
 896     $(this.leafEdgeTmp).css({
 897         borderStyle: 'solid none solid solid',
 898         borderColor: 'rgb(51, 51, 34)',
 899         borderWidth: '1px 0px 1px 1px',
 900         background: 'transparent url(http://www.us.archive.org/GnuBook/images/left-edges.png) repeat scroll 0% 0%',
 901         width: leafEdgeTmpW + 'px',
 902         height: this.twoPageH-1 + 'px',
 903         left: gutter-scaledWL+10+newLeafEdgeWidthL+'px',
 904         top: top+'px',
 905         position: 'absolute',
 906         zIndex:1000
 907     }).appendTo('#GBcontainer');
 908
 909     //$(this.leafEdgeL).css('width', newLeafEdgeWidthL+'px');
 910     $(this.leafEdgeL).css({
 911         width: newLeafEdgeWidthL+'px',
 912         left: gutter-scaledWL-newLeafEdgeWidthL+'px'
 913     });
 914
 915     var left = $(this.prefetchedImgs[leftLeaf]).offset().left;
 916     var right = $('#GBcontainer').width()-left-$(this.prefetchedImgs[leftLeaf]).width()+$('#GBcontainer').offset().left-2+'px';
 917     $(this.prefetchedImgs[leftLeaf]).css({
 918         right: right,
 919         left: null
 920     });
 921
 922      left = $(this.prefetchedImgs[leftLeaf]).offset().left - $('#book_div_1').offset().left;
 923      right = left+$(this.prefetchedImgs[leftLeaf]).width()+'px';
 924
 925     $(this.leafEdgeTmp).animate({left: gutter}, this.flipSpeed, 'easeInSine');
 926     //$(this.prefetchedImgs[leftLeaf]).animate({width: '0px'}, 'slow', 'easeInSine');
 927
 928     var scaledWR = this.getPageWidth2UP(prevR);
 929
 930     var self = this;
 931
 932     this.removeSearchHilites();
 933
 934     $(this.prefetchedImgs[leftLeaf]).animate({width: '0px'}, self.flipSpeed, 'easeInSine', function() {
 935         $(self.leafEdgeTmp).animate({left: gutter+scaledWR+'px'}, self.flipSpeed, 'easeOutSine');
 936         $(self.prefetchedImgs[prevR]).animate({width: scaledWR+'px'}, self.flipSpeed, 'easeOutSine', function() {
 937             $(self.prefetchedImgs[prevL]).css('zIndex', 2);
 938
 939             $(self.leafEdgeR).css({
 940                 width: self.twoPageEdgeW-newLeafEdgeWidthL+'px',
 941                 left:  gutter+scaledWR+'px'
 942             });
 943
 944             $(self.twoPageDiv).css({
 945                 width: scaledWL+scaledWR+self.twoPageEdgeW+20+'px',
 946                 left: gutter-scaledWL-newLeafEdgeWidthL-10+'px'
 947             });
 948
 949             $(self.leafEdgeTmp).remove();
 950             self.leafEdgeTmp = null;
 951
 952             self.currentLeafL = prevL;
 953             self.currentLeafR = prevR;
 954             self.displayedLeafs = [prevL, prevR];
 955             self.setClickHandlers();
 956             self.pruneUnusedImgs();
 957             self.prefetch();
 958             self.animating = false;
 959
 960             self.updateSearchHilites2UP();
 961             self.updatePageNumBox2UP();
 962             //$('#GBzoom').text((self.twoPageH/self.getPageHeight(prevL)).toString().substr(0,4));
 963         });
 964     });
 965
 966 }
 967
 968 // flipFwdToIndex()
 969 //______________________________________________________________________________
 970 // to flip forward one spread, pass index=null
 971 GnuBook.prototype.flipFwdToIndex = function(index) {
 972     var rightLeaf = this.currentLeafR;
 973     if (rightLeaf >= this.numLeafs-3) return;
 974
 975     if (this.animating) return;
 976
 977     if (null != this.leafEdgeTmp) {
 978         alert('error: leafEdgeTmp should be null!');
 979         return;
 980     }
 981
 982
 983     if (null == index) {
 984         index = rightLeaf+2;
 985     }
 986     if (index>=this.numLeafs-3) return;
 987
 988     if ('R' !=  this.getPageSide(index)) {
 989         alert('img with index ' + index + ' is not a right-hand page');
 990         return;
 991     }
 992
 993     this.animating = true;
 994
 995     var nextL = index-1;
 996     var nextR = index;
 997
 998     var gutter= this.prepareFlipFwd(nextL, nextR);
 999
1000     var oldLeafEdgeWidthL = parseInt( (this.currentLeafL/this.numLeafs)*this.twoPageEdgeW );
1001     var oldLeafEdgeWidthR = this.twoPageEdgeW-oldLeafEdgeWidthL;
1002     var newLeafEdgeWidthL = parseInt( (nextL            /this.numLeafs)*this.twoPageEdgeW );
1003     var newLeafEdgeWidthR = this.twoPageEdgeW-newLeafEdgeWidthL;
1004
1005     var leafEdgeTmpW = oldLeafEdgeWidthR - newLeafEdgeWidthR;
1006
1007     var top  = ($('#GBcontainer').height() - this.twoPageH) >> 1;
1008
1009     var height  = this.getPageHeight(rightLeaf);
1010     var width   = this.getPageWidth(rightLeaf);
1011     var scaledW = this.twoPageH*width/height;
1012
1013     var middle     = ($('#GBcontainer').width() >> 1);
1014     var currGutter = middle+parseInt((2*this.currentLeafL - this.numLeafs)*this.twoPageEdgeW/this.numLeafs/2);
1015
1016     this.leafEdgeTmp = document.createElement('div');
1017     $(this.leafEdgeTmp).css({
1018         borderStyle: 'solid none solid solid',
1019         borderColor: 'rgb(51, 51, 34)',
1020         borderWidth: '1px 0px 1px 1px',
1021         background: 'transparent url(http://www.us.archive.org/GnuBook/images/left-edges.png) repeat scroll 0% 0%',
1022         width: leafEdgeTmpW + 'px',
1023         height: this.twoPageH-1 + 'px',
1024         left: currGutter+scaledW+'px',
1025         top: top+'px',
1026         position: 'absolute',
1027         zIndex:1000
1028     }).appendTo('#GBcontainer');
1029
1030     var scaledWR = this.getPageWidth2UP(nextR);
1031     $(this.leafEdgeR).css({width: newLeafEdgeWidthR+'px', left: gutter+scaledWR+'px' });
1032
1033     var scaledWL = this.getPageWidth2UP(nextL);
1034
1035     var self = this;
1036
1037     var speed = this.flipSpeed;
1038
1039     this.removeSearchHilites();
1040
1041     $(this.leafEdgeTmp).animate({left: gutter}, speed, 'easeInSine');
1042     $(this.prefetchedImgs[rightLeaf]).animate({width: '0px'}, speed, 'easeInSine', function() {
1043         $(self.leafEdgeTmp).animate({left: gutter-scaledWL-leafEdgeTmpW+'px'}, speed, 'easeOutSine');
1044         $(self.prefetchedImgs[nextL]).animate({width: scaledWL+'px'}, speed, 'easeOutSine', function() {
1045             $(self.prefetchedImgs[nextR]).css('zIndex', 2);
1046
1047             $(self.leafEdgeL).css({
1048                 width: newLeafEdgeWidthL+'px',
1049                 left: gutter-scaledWL-newLeafEdgeWidthL+'px'
1050             });
1051
1052             $(self.twoPageDiv).css({
1053                 width: scaledWL+scaledWR+self.twoPageEdgeW+20+'px',
1054                 left: gutter-scaledWL-newLeafEdgeWidthL-10+'px'
1055             });
1056
1057             $(self.leafEdgeTmp).remove();
1058             self.leafEdgeTmp = null;
1059
1060             self.currentLeafL = nextL;
1061             self.currentLeafR = nextR;
1062             self.displayedLeafs = [nextL, nextR];
1063             self.setClickHandlers();
1064             self.pruneUnusedImgs();
1065             self.prefetch();
1066             self.animating = false;
1067
1068             self.updateSearchHilites2UP();
1069             self.updatePageNumBox2UP();
1070             //$('#GBzoom').text((self.twoPageH/self.getPageHeight(nextL)).toString().substr(0,4));
1071         });
1072     });
1073
1074 }
1075
1076 // setClickHandlers
1077 //______________________________________________________________________________
1078 GnuBook.prototype.setClickHandlers = function() {
1079     var self = this;
1080     $(this.prefetchedImgs[this.currentLeafL]).click(function() {
1081         //self.prevPage();
1082         self.autoStop();
1083         self.flipBackToIndex(null);
1084     });
1085     $(this.prefetchedImgs[this.currentLeafR]).click(function() {
1086         //self.nextPage();'
1087         self.autoStop();
1088         self.flipFwdToIndex(null);
1089     });
1090 }
1091
1092 // prefetchImg()
1093 //______________________________________________________________________________
1094 GnuBook.prototype.prefetchImg = function(leafNum) {
1095     if (undefined == this.prefetchedImgs[leafNum]) {
1096         var img = document.createElement("img");
1097         img.src = this.getPageURI(leafNum);
1098         this.prefetchedImgs[leafNum] = img;
1099     }
1100 }
1101
1102
1103 // prepareFlipBack()
1104 //______________________________________________________________________________
1105 GnuBook.prototype.prepareFlipBack = function(prevL, prevR) {
1106
1107     this.prefetchImg(prevL);
1108     this.prefetchImg(prevR);
1109
1110     var height  = this.getPageHeight(prevL);
1111     var width   = this.getPageWidth(prevL);
1112     var middle = ($('#GBcontainer').width() >> 1);
1113     var top  = ($('#GBcontainer').height() - this.twoPageH) >> 1;
1114     var scaledW = this.twoPageH*width/height;
1115
1116     var gutter = middle+parseInt((2*prevL - this.numLeafs)*this.twoPageEdgeW/this.numLeafs/2);
1117
1118     $(this.prefetchedImgs[prevL]).css({
1119         position: 'absolute',
1120         /*right:   middle+'px',*/
1121         left: gutter-scaledW+'px',
1122         top:    top+'px',
1123         backgroundColor: 'rgb(234, 226, 205)',
1124         height: this.twoPageH,
1125         width:  scaledW+'px',
1126         borderRight: '1px solid black',
1127         zIndex: 1
1128     });
1129
1130     $('#GBcontainer').append(this.prefetchedImgs[prevL]);
1131
1132     $(this.prefetchedImgs[prevR]).css({
1133         position: 'absolute',
1134         left:   gutter+'px',
1135         top:    top+'px',
1136         backgroundColor: 'rgb(234, 226, 205)',
1137         height: this.twoPageH,
1138         width:  '0px',
1139         borderLeft: '1px solid black',
1140         zIndex: 2
1141     });
1142
1143     $('#GBcontainer').append(this.prefetchedImgs[prevR]);
1144
1145
1146     return gutter;
1147
1148 }
1149
1150 // prepareFlipFwd()
1151 //______________________________________________________________________________
1152 GnuBook.prototype.prepareFlipFwd = function(nextL, nextR) {
1153
1154     this.prefetchImg(nextL);
1155     this.prefetchImg(nextR);
1156
1157     var height  = this.getPageHeight(nextR);
1158     var width   = this.getPageWidth(nextR);
1159     var middle = ($('#GBcontainer').width() >> 1);
1160     var top  = ($('#GBcontainer').height() - this.twoPageH) >> 1;
1161     var scaledW = this.twoPageH*width/height;
1162
1163     var gutter = middle+parseInt((2*nextL - this.numLeafs)*this.twoPageEdgeW/this.numLeafs/2);
1164
1165     $(this.prefetchedImgs[nextR]).css({
1166         position: 'absolute',
1167         left:   gutter+'px',
1168         top:    top+'px',
1169         backgroundColor: 'rgb(234, 226, 205)',
1170         height: this.twoPageH,
1171         width:  scaledW+'px',
1172         borderLeft: '1px solid black',
1173         zIndex: 1
1174     });
1175
1176     $('#GBcontainer').append(this.prefetchedImgs[nextR]);
1177
1178     height  = this.getPageHeight(nextL);
1179     width   = this.getPageWidth(nextL);
1180     scaledW = this.twoPageH*width/height;
1181
1182     $(this.prefetchedImgs[nextL]).css({
1183         position: 'absolute',
1184         right:   $('#GBcontainer').width()-gutter+'px',
1185         top:    top+'px',
1186         backgroundColor: 'rgb(234, 226, 205)',
1187         height: this.twoPageH,
1188         width:  0+'px',
1189         borderRight: '1px solid black',
1190         zIndex: 2
1191     });
1192
1193     $('#GBcontainer').append(this.prefetchedImgs[nextL]);
1194
1195     return gutter;
1196
1197 }
1198
1199 // getNextLeafs()
1200 //______________________________________________________________________________
1201 GnuBook.prototype.getNextLeafs = function(o) {
1202     //TODO: we might have two left or two right leafs in a row (damaged book)
1203     //For now, assume that leafs are contiguous.
1204
1205     //return [this.currentLeafL+2, this.currentLeafL+3];
1206     o.L = this.currentLeafL+2;
1207     o.R = this.currentLeafL+3;
1208 }
1209
1210 // getprevLeafs()
1211 //______________________________________________________________________________
1212 GnuBook.prototype.getPrevLeafs = function(o) {
1213     //TODO: we might have two left or two right leafs in a row (damaged book)
1214     //For now, assume that leafs are contiguous.
1215
1216     //return [this.currentLeafL-2, this.currentLeafL-1];
1217     o.L = this.currentLeafL-2;
1218     o.R = this.currentLeafL-1;
1219 }
1220
1221 // pruneUnusedImgs()
1222 //______________________________________________________________________________
1223 GnuBook.prototype.pruneUnusedImgs = function() {
1224     //console.log('current: ' + this.currentLeafL + ' ' + this.currentLeafR);
1225     for (var key in this.prefetchedImgs) {
1226         //console.log('key is ' + key);
1227         if ((key != this.currentLeafL) && (key != this.currentLeafR)) {
1228             //console.log('removing key '+ key);
1229             $(this.prefetchedImgs[key]).remove();
1230         }
1231         if ((key < this.currentLeafL-4) || (key > this.currentLeafR+4)) {
1232             //console.log('deleting key '+ key);
1233             delete this.prefetchedImgs[key];
1234         }
1235     }
1236 }
1237
1238 // prefetch()
1239 //______________________________________________________________________________
1240 GnuBook.prototype.prefetch = function() {
1241     var lim = this.currentLeafL-4;
1242     var i;
1243     lim = Math.max(lim, 0);
1244     for (i = lim; i < this.currentLeafL; i++) {
1245         this.prefetchImg(i);
1246     }
1247
1248     if (this.numLeafs > (this.currentLeafR+1)) {
1249         lim = Math.min(this.currentLeafR+4, this.numLeafs-1);
1250         for (i=this.currentLeafR+1; i<=lim; i++) {
1251             this.prefetchImg(i);
1252         }
1253     }
1254 }
1255
1256 // getPageWidth2UP()
1257 //______________________________________________________________________________
1258 GnuBook.prototype.getPageWidth2UP = function(index) {
1259     var height  = this.getPageHeight(index);
1260     var width   = this.getPageWidth(index);
1261     return Math.floor(this.twoPageH*width/height);
1262 }
1263
1264 // search()
1265 //______________________________________________________________________________
1266 GnuBook.prototype.search = function(term) {
1267     $('#GnuBookSearchScript').remove();
1268         var script  = document.createElement("script");
1269         script.setAttribute('id', 'GnuBookSearchScript');
1270         script.setAttribute("type", "text/javascript");
1271         script.setAttribute("src", 'http://'+this.server+'/GnuBook/flipbook_search_gb.php?url='+escape(this.bookPath+'/'+this.bookId+'_djvu.xml')+'&term='+term+'&format=XML&callback=gb.GBSearchCallback');
1272         document.getElementsByTagName('head')[0].appendChild(script);
1273 }
1274
1275 // GBSearchCallback()
1276 //______________________________________________________________________________
1277 GnuBook.prototype.GBSearchCallback = function(txt) {
1278     //alert(txt);
1279     if (jQuery.browser.msie) {
1280         var dom=new ActiveXObject("Microsoft.XMLDOM");
1281         dom.async="false";
1282         dom.loadXML(txt);
1283     } else {
1284         var parser = new DOMParser();
1285         var dom = parser.parseFromString(txt, "text/xml");
1286     }
1287
1288     $('#GnuBookSearchResults').empty();
1289     $('#GnuBookSearchResults').append('<ul>');
1290
1291     for (var key in this.searchResults) {
1292         if (null != this.searchResults[key].div) {
1293             $(this.searchResults[key].div).remove();
1294         }
1295         delete this.searchResults[key];
1296     }
1297
1298     var pages = dom.getElementsByTagName('PAGE');
1299     for (var i = 0; i < pages.length; i++){
1300         //console.log(pages[i].getAttribute('file').substr(1) +'-'+ parseInt(pages[i].getAttribute('file').substr(1), 10));
1301
1302
1303         var re = new RegExp (/_(\d{4})/);
1304         var reMatch = re.exec(pages[i].getAttribute('file'));
1305         var leafNum = parseInt(reMatch[1], 10);
1306         //var leafNum = parseInt(pages[i].getAttribute('file').substr(1), 10);
1307
1308         var children = pages[i].childNodes;
1309         var context = '';
1310         for (var j=0; j<children.length; j++) {
1311             //console.log(j + ' - ' + children[j].nodeName);
1312             //console.log(children[j].firstChild.nodeValue);
1313             if ('CONTEXT' == children[j].nodeName) {
1314                 context += children[j].firstChild.nodeValue;
1315             } else if ('WORD' == children[j].nodeName) {
1316                 context += '<b>'+children[j].firstChild.nodeValue+'</b>';
1317
1318                 var index = this.leafNumToIndex(leafNum);
1319                 if (null != index) {
1320                     //coordinates are [left, bottom, right, top, [baseline]]
1321                     //we'll skip baseline for now...
1322                     var coords = children[j].getAttribute('coords').split(',',4);
1323                     if (4 == coords.length) {
1324                         this.searchResults[index] = {'l':coords[0], 'b':coords[1], 'r':coords[2], 't':coords[3], 'div':null};
1325                     }
1326                 }
1327             }
1328         }
1329         //TODO: remove hardcoded instance name
1330         $('#GnuBookSearchResults').append('<li><b><a href="javascript:gb.jumpToIndex('+index+');">Leaf ' + leafNum + '</a></b> - ' + context+'</li>');
1331     }
1332     $('#GnuBookSearchResults').append('</ul>');
1333
1334     this.updateSearchHilites();
1335 }
1336
1337 // updateSearchHilites()
1338 //______________________________________________________________________________
1339 GnuBook.prototype.updateSearchHilites = function() {
1340     if (2 == this.mode) {
1341         this.updateSearchHilites2UP();
1342     } else {
1343         this.updateSearchHilites1UP();
1344     }
1345 }
1346
1347 // showSearchHilites1UP()
1348 //______________________________________________________________________________
1349 GnuBook.prototype.updateSearchHilites1UP = function() {
1350
1351     for (var key in this.searchResults) {
1352
1353         if (-1 != jQuery.inArray(parseInt(key), this.displayedLeafs)) {
1354             var result = this.searchResults[key];
1355             if(null == result.div) {
1356                 result.div = document.createElement('div');
1357                 $(result.div).attr('className', 'GnuBookSearchHilite').appendTo('#pagediv'+key);
1358                 //console.log('appending ' + key);
1359             }
1360             $(result.div).css({
1361                 width:  (result.r-result.l)/this.reduce + 'px',
1362                 height: (result.b-result.t)/this.reduce + 'px',
1363                 left:   (result.l)/this.reduce + 'px',
1364                 top:    (result.t)/this.reduce +'px'
1365             });
1366
1367         } else {
1368             //console.log(key + ' not displayed');
1369             this.searchResults[key].div=null;
1370         }
1371     }
1372 }
1373
1374 // showSearchHilites2UP()
1375 //______________________________________________________________________________
1376 GnuBook.prototype.updateSearchHilites2UP = function() {
1377
1378     var middle = ($('#GBcontainer').width() >> 1);
1379
1380     for (var key in this.searchResults) {
1381         key = parseInt(key, 10);
1382         if (-1 != jQuery.inArray(key, this.displayedLeafs)) {
1383             var result = this.searchResults[key];
1384             if(null == result.div) {
1385                 result.div = document.createElement('div');
1386                 $(result.div).attr('className', 'GnuBookSearchHilite').css('zIndex', 3).appendTo('#GBcontainer');
1387                 //console.log('appending ' + key);
1388             }
1389
1390             var height = this.getPageHeight(key);
1391             var width  = this.getPageWidth(key)
1392             var reduce = this.twoPageH/height;
1393             var scaledW = parseInt(width*reduce);
1394
1395             var gutter = middle+parseInt((2*this.currentLeafL - this.numLeafs)*this.twoPageEdgeW/this.numLeafs/2);
1396
1397             if ('L' == this.getPageSide(key)) {
1398                 var pageL = gutter-scaledW;
1399             } else {
1400                 var pageL = gutter;
1401             }
1402             var pageT  = ($('#GBcontainer').height() - this.twoPageH) >> 1;
1403
1404             $(result.div).css({
1405                 width:  (result.r-result.l)*reduce + 'px',
1406                 height: (result.b-result.t)*reduce + 'px',
1407                 left:   pageL+(result.l)*reduce + 'px',
1408                 top:    pageT+(result.t)*reduce +'px'
1409             });
1410
1411         } else {
1412             //console.log(key + ' not displayed');
1413             if (null != this.searchResults[key].div) {
1414                 //console.log('removing ' + key);
1415                 $(this.searchResults[key].div).remove();
1416             }
1417             this.searchResults[key].div=null;
1418         }
1419     }
1420 }
1421
1422 // removeSearchHilites()
1423 //______________________________________________________________________________
1424 GnuBook.prototype.removeSearchHilites = function() {
1425     for (var key in this.searchResults) {
1426         if (null != this.searchResults[key].div) {
1427             $(this.searchResults[key].div).remove();
1428             this.searchResults[key].div=null;
1429         }
1430     }
1431 }
1432
1433 // showEmbedCode()
1434 //______________________________________________________________________________
1435 GnuBook.prototype.showEmbedCode = function() {
1436     if (null != this.embedPopup) { // check if already showing
1437         return;
1438     }
1439     this.autoStop();
1440     this.embedPopup = document.createElement("div");
1441     $(this.embedPopup).css({
1442         position: 'absolute',
1443         top:      '20px',
1444         left:     ($('#GBcontainer').width()-400)/2 + 'px',
1445         width:    '400px',
1446         padding:  "20px",
1447         border:   "3px double #999999",
1448         zIndex:   3,
1449         backgroundColor: "#fff"
1450     }).appendTo('#GnuBook');
1451
1452     htmlStr =  '<p style="text-align:center;"><b>Embed Bookreader in your blog!</b></p>';
1453     htmlStr += '<p><b>Note:</b> The bookreader is still in beta testing. URLs may change in the future, breaking embedded books. This feature is just for testing!</b></p>';
1454     htmlStr += '<p>The bookreader uses iframes for embedding. It will not work on web hosts that block iframes. The embed feature has been tested on blogspot.com blogs as well as self-hosted Wordpress blogs. This feature will NOT work on wordpress.com blogs.</p>';
1455     htmlStr += '<p>Embed Code: <input type="text" size="40" value="<iframe src=\'http://www.us.archive.org/GnuBook/GnuBookEmbed.php?id='+this.bookId+'\' width=\'430px\' height=\'430px\'></iframe>"></p>';
1456     htmlStr += '<p style="text-align:center;"><a href="" onclick="gb.embedPopup = null; $(this.parentNode.parentNode).remove(); return false">Close popup</a></p>';
1457
1458     this.embedPopup.innerHTML = htmlStr;
1459 }
1460
1461 // autoToggle()
1462 //______________________________________________________________________________
1463 GnuBook.prototype.autoToggle = function() {
1464     if (2 != this.mode) {
1465         this.switchMode(2);
1466     }
1467
1468     var self = this;
1469     if (null == this.autoTimer) {
1470         this.flipSpeed = 2000;
1471         this.flipFwdToIndex();
1472
1473         $('#autoImg').removeClass('play').addClass('pause');
1474         this.autoTimer=setInterval(function(){
1475             if (self.animating) {return;}
1476
1477             if (self.currentLeafR >= self.numLeafs-5) {
1478                 self.flipBackToIndex(1);
1479             } else {
1480                 self.flipFwdToIndex();
1481             }
1482         },5000);
1483     } else {
1484         this.autoStop();
1485     }
1486 }
1487
1488 // autoStop()
1489 //______________________________________________________________________________
1490 GnuBook.prototype.autoStop = function() {
1491     if (null != this.autoTimer) {
1492         clearInterval(this.autoTimer);
1493         this.flipSpeed = 'fast';
1494         $('#autoImg').removeClass('pause').addClass('play');
1495         this.autoTimer = null;
1496     }
1497 }
1498
1499 // keyboardNavigationIsDisabled(event)
1500 //   - returns true if keyboard navigation should be disabled for the event
1501 //______________________________________________________________________________
1502
1503 GnuBook.prototype.keyboardNavigationIsDisabled = function(event) {
1504     if (event.target.tagName == "INPUT") {
1505         return true;
1506     }
1507     return false;
1508 }