disable js zoom

share/pdf2htmlEX.js

@@ -10,13 +10,58 @@
  * Copyright 2012 Lu Wang <coolwanglu@gmail.com>
  */
 
-var pdf2htmlEX = {
+var pdf2htmlEX = (function(){
+  var EPS = 1e-6;
+  var Page = function(page, box, visible) {
+    this.p = page;
+    this.b = box;
+    this.v = visible;
+    /*
+     * scale ratios
+     * 
+     * default_r : the first one
+     * set_r : last set 
+     * cur_r : currently using
+     */
+    this.default_r = this.set_r = this.cur_r = page.height() / box.height();
+  };
+  Page.prototype.hide = function(){
+    if(this.v) {
+      this.v = false;
+      this.b.hide();
+    }
+  };
+  Page.prototype.show = function(){
+    if(Math.abs(this.set_r - this.cur_r) > EPS) {
+      this.cur_r = this.set_r;
+      this.b.css('transform', 'scale('+this.cur_r.toFixed(3)+')');
+    }
+    if(!(this.v)) {
+      this.v = true;
+      this.b.show();
+    }
+  };
+  Page.prototype.rescale = function(ratio, is_relative) {
+    if(ratio == 0) {
+      this.set_r = this.default_r;
+    } else if (is_relative) {
+      this.set_r *= ratio;
+    } else {
+      this.set_r = ratio;
+    }
+
+    /* wait for redraw */
+    this.hide();
+
+    this.p.height(this.b.height() * this.set_r);
+    this.p.width(this.b.width() * this.set_r);
+
+  };
+
+  return {
     pages : [],
-  page_boxes : [],
     container : null,
-  selective_render_timer : null,
+    render_timer : null,
-  default_scale_ratio : 1.0,
-  cur_scale_ratio : 1.0,
 
     /* Constants */
     render_timeout : 200,
@@ -28,21 +73,22 @@ var pdf2htmlEX = {
     },
 
     init_after_loading_content : function() {
-    this.pages = $(".p");
-    this.page_boxes = $(".b");
       this.container = $("#pdf-main");
 
-    if(this.pages.length > 0)
+      var new_pages = new Array();
-    {
+      var pl= $(".p");
-      this.default_scale_ratio = this.cur_scale_ratio 
+      var pbl = $(".b");
-        = $(this.pages[0]).height() / $(this.page_boxes[0]).height();
+      for(var i = 0, l = pl.length; i < l; ++i) {
+        new_pages.push(new Page($(pl[i]), $(pbl[i]), false));
       }
-
+      this.pages = new_pages;
-    this.selective_render();
 
       var _ = this;
       this.container.scroll(function(){ _.schedule_render(); });
-    this.zoom_fixer();
+
+      //this.zoom_fixer();
+
+      this.render();
     },
 
     init : function() {
@@ -68,45 +114,46 @@ var pdf2htmlEX = {
     },
 
     hide_pages : function() {
-    for(var i = 0, l = this.page_boxes.length; i < l; ++i)
+      var pl = this.pages;
-    {
+      for(var i = 0, l = pl.length; i < l; ++i)
-      $(this.page_boxes[i]).hide();
+        pl[i].hide();
-    }
     },
 
-  selective_render : function () {
+    render : function () {
       /* hide (positional) invisible pages */
-    var l = this.pages.length;
+      var pl = this.pages;
+      var l = pl.length;
       var ch = this.container.height();
       
       var i;
       for(i = 0; i < l; ++i) {
-      var cur_page = $(this.pages[i]);
+        var p = pl[i];
 
-      if(cur_page.offset().top + cur_page.height() >= 0) break;
+        if(p.p.offset().top + p.p.height() >= 0) break;
-      if(i > 0) $(this.page_boxes[i-1]).hide();
+        if(i > 0) pl[i-1].hide();
       }
 
-    if((i > 0) && (i < l)) $(this.page_boxes[i-1]).show();
+      if((i > 0) && (i < l)) pl[i-1].show();
 
       for(; i < l; ++i) {
-      $(this.page_boxes[i]).show();
+        var p = pl[i];
+        p.show();
 
-      if($(this.pages[i]).offset().top > ch) break;
+        if(p.p.offset().top > ch) break;
       }
 
       for(++i; i < l; ++i) {
-      $(this.page_boxes[i]).hide();
+        pl[i].hide();
       }
     },
 
     schedule_render : function() {
-    if(this.selective_render_timer)
+      if(this.render_timer)
-      clearTimeout(this.selective_render_timer);
+        clearTimeout(this.render_timer);
 
       var _ = this;
-    this.selective_render_timer = setTimeout(function () {
+      this.render_timer = setTimeout(function () {
-      _.selective_render();
+        _.render();
       }, this.render_timeout);
     },
 
@@ -140,7 +187,7 @@ var pdf2htmlEX = {
               _.rescale(_.scale_step, true);
               break;
             case 48: // '0'
-            _.rescale(_.default_scale_ratio, false);
+              _.rescale(0, false);
               break;
             default:
               return;
@@ -151,21 +198,9 @@ var pdf2htmlEX = {
     },
 
     rescale : function (ratio, is_relative) {
-    console.log('RESCALE');
+      var pl = this.pages;
-
+      for(var i = 0, l = pl.length; i < l; ++i) {
-    if(is_relative)
+        pl[i].rescale(ratio, is_relative);
-      ratio *= this.cur_scale_ratio;
-
-    this.cur_scale_ratio = ratio;
-    this.hide_pages();
-
-    for(var i = 0, l = this.page_boxes.length; i < l; ++i)
-    {
-      var p = $(this.pages[i]);
-      var pb = $(this.page_boxes[i]);
-      p.height(pb.height() * ratio);
-      p.width(pb.width() * ratio);
-      pb.css('transform', 'scale('+ratio.toFixed(3)+')');
       }
 
       this.schedule_render();
@@ -173,3 +208,4 @@ var pdf2htmlEX = {
 
     __last_member__ : 'no comma' /*,*/
   }.init();
+})();