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+/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab filetype=javascript : */
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+/**
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+ * @license pdf2htmlEX.js: Core UI functions for pdf2htmlEX
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+ * Copyright 2012,2013 Lu Wang <coolwanglu@gmail.com> and other contributors
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+ * https://github.com/coolwanglu/pdf2htmlEX/blob/master/share/LICENSE
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+ */
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+
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+/*
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+ * Attention:
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+ * This files is to be optimized by closure-compiler,
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+ * so pay attention to the forms of property names:
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+ *
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+ * string/bracket form is safe, won't be optimized:
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+ * var obj={ 'a':'b' }; obj['a'] = 'b';
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+ * name/dot form will be optimized, the name is likely to be modified:
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+ * var obj={ a:'b' }; obj.a = 'b';
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+ *
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+ * Either form can be used for internal objects,
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+ * but must be consistent for each one respectively.
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+ *
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+ * string/bracket form must be used for external objects
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+ * e.g. DEFAULT_CONFIG, object stored in page-data
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+ * property names are part of the `protocol` in these cases.
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+ *
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+ */
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+
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+'use strict';
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+
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+var pdf2htmlEX = window['pdf2htmlEX'] = window['pdf2htmlEX'] || {};
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+
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+/**
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+ * @const
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+ * @struct
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+ */
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+var CSS_CLASS_NAMES = {
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+ page_frame : 'pf',
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+ page_content_box : 'pc',
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+ page_data : 'pi',
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+ background_image : 'bi',
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+ link : 'l',
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+ input_radio : 'ir',
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+ __dummy__ : 'no comma'
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+};
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+
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+/**
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+ * configurations of Viewer
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+ * @const
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+ * @dict
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+ */
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+var DEFAULT_CONFIG = {
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+ // id of the element to put the pages in
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+ 'container_id' : 'page-container',
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+ // id of the element for sidebar (to open and close)
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+ 'sidebar_id' : 'sidebar',
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+ // id of the element for outline
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+ 'outline_id' : 'outline',
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+ // class for the loading indicator
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+ 'loading_indicator_cls' : 'loading-indicator',
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+ // How many page shall we preload that are below the last visible page
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+ 'preload_pages' : 3,
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+ // how many ms should we wait before actually rendering the pages and after a scroll event
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+ 'render_timeout' : 100,
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+ // zoom ratio step for each zoom in/out event
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+ 'scale_step' : 0.9,
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+ // register global key handler, allowing navigation by keyboard
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+ 'key_handler' : true,
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+ // register hashchange handler, navigate to the location specified by the hash
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+ 'hashchange_handler' : true,
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+ // register view history handler, allowing going back to the previous location
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+ 'view_history_handler' : true,
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+
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+ '__dummy__' : 'no comma'
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+};
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+
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+/** @const */
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+var EPS = 1e-6;
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+
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+/************************************/
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+/* utility function */
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+/**
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+ * @param{Array.<number>} ctm
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+ */
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+function invert(ctm) {
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+ var det = ctm[0] * ctm[3] - ctm[1] * ctm[2];
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+ return [ ctm[3] / det
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+ ,-ctm[1] / det
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+ ,-ctm[2] / det
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+ ,ctm[0] / det
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+ ,(ctm[2] * ctm[5] - ctm[3] * ctm[4]) / det
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+ ,(ctm[1] * ctm[4] - ctm[0] * ctm[5]) / det
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+ ];
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+};
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+/**
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+ * @param{Array.<number>} ctm
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+ * @param{Array.<number>} pos
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+ */
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+function transform(ctm, pos) {
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+ return [ctm[0] * pos[0] + ctm[2] * pos[1] + ctm[4]
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+ ,ctm[1] * pos[0] + ctm[3] * pos[1] + ctm[5]];
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+};
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+
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+/**
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+ * @param{Element} ele
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+ */
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+function get_page_number(ele) {
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+ return parseInt(ele.getAttribute('data-page-no'), 16);
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+};
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+
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+/**
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+ * @param{NodeList} eles
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+ */
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+function disable_dragstart(eles) {
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+ for (var i = 0, l = eles.length; i < l; ++i) {
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+ eles[i].addEventListener('dragstart', function() {
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+ return false;
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+ }, false);
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+ }
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+};
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+
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+/**
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+ * @param{...Object} var_args
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+ */
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+function clone_and_extend_objs(var_args) {
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+ var result_obj = {};
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+ for (var i = 0, l = arguments.length; i < l; ++i) {
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+ var cur_obj = arguments[i];
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+ for (var k in cur_obj) {
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+ if (cur_obj.hasOwnProperty(k)) {
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+ result_obj[k] = cur_obj[k];
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+ }
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+ }
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+ }
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+ return result_obj;
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+};
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+
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+/**
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+ * @constructor
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+ * @param{Element} page The element for the page
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+ */
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+function Page(page) {
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+ if (!page) return;
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+
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+ this.loaded = false;
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+ this.shown = false;
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+ this.page = page; // page frame element
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+
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+ this.num = get_page_number(page);
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+
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+ // page size
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+ // Need to make rescale work when page_content_box is not loaded, yet
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+ this.original_height = page.clientHeight;
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+ this.original_width = page.clientWidth;
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+
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+ // content box
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+ var content_box = page.getElementsByClassName(CSS_CLASS_NAMES.page_content_box)[0];
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+
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+ // if page is loaded
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+ if (content_box) {
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+ this.content_box = content_box;
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+ /*
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+ * scale ratios
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+ *
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+ * original_scale : the first one
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+ * cur_scale : currently using
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+ */
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+ this.original_scale = this.cur_scale = this.original_height / content_box.clientHeight;
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+ this.page_data = JSON.parse(page.getElementsByClassName(CSS_CLASS_NAMES.page_data)[0].getAttribute('data-data'));
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+
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+ this.ctm = this.page_data['ctm'];
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+ this.ictm = invert(this.ctm);
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+
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+ this.loaded = true;
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+ }
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+};
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+Page.prototype = {
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+ /* hide & show are for contents, the page frame is still there */
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+ hide : function(){
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+ if (this.loaded && this.shown) {
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+ this.content_box.classList.remove('opened');
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+ this.shown = false;
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+ }
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+ },
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+ show : function(){
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+ if (this.loaded && !this.shown) {
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+ this.content_box.classList.add('opened');
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+ this.shown = true;
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+ }
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+ },
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+ /**
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+ * @param{number} ratio
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+ */
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+ rescale : function(ratio) {
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+ if (ratio === 0) {
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+ // reset scale
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+ this.cur_scale = this.original_scale;
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+ } else {
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+ this.cur_scale = ratio;
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+ }
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+
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+ // scale the content box
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+ if (this.loaded) {
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+ var cbs = this.content_box.style;
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+ cbs.msTransform = cbs.webkitTransform = cbs.transform = 'scale('+this.cur_scale.toFixed(3)+')';
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+ }
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+
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+ // stretch the page frame to hold the place
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+ {
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+ var ps = this.page.style;
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+ ps.height = (this.original_height * this.cur_scale) + 'px';
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+ ps.width = (this.original_width * this.cur_scale) + 'px';
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+ }
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+ },
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+ /*
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+ * return the coordinate of the top-left corner of container
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+ * in our coordinate system
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+ * assuming that p.parentNode === p.offsetParent
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+ */
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+ view_position : function () {
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+ var p = this.page;
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+ var c = p.parentNode;
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+ return [c.scrollLeft - p.offsetLeft - p.clientLeft
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+ ,c.scrollTop - p.offsetTop - p.clientTop];
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+ },
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+ height : function () {
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+ return this.page.clientHeight;
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+ },
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+ width : function () {
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+ return this.page.clientWidth;
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+ }
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+};
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+
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+/**
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+ * @constructor
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+ * @param{Object=} config
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+ */
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+function Viewer(config) {
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+ this.config = clone_and_extend_objs(DEFAULT_CONFIG, (arguments.length > 0 ? config : {}));
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+ this.pages_loading = [];
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+ this.init_before_loading_content();
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+
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+ var self = this;
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+ document.addEventListener('DOMContentLoaded', function(){
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+ self.init_after_loading_content();
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+ }, false);
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+};
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+
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+Viewer.prototype = {
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+ scale : 1,
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+ /*
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+ * index of the active page (the one with largest visible area)
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+ * which estimates the page currently being viewed
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+ */
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+ cur_page_idx : 0,
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+
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+ /*
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+ * index of the first visible page
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+ * used when determining current view
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+ */
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+ first_page_idx : 0,
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+
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+ init_before_loading_content : function() {
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+ /* hide all pages before loading, will reveal only visible ones later */
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+ this.pre_hide_pages();
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+ },
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+
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+ initialize_radio_button : function() {
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+ var elements = document.getElementsByClassName(CSS_CLASS_NAMES.input_radio);
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+
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+ for(var i = 0; i < elements.length; i++) {
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+ var r = elements[i];
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+
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+ r.addEventListener('click', function() {
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+ this.classList.toggle("checked");
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+ });
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+ }
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+ },
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+
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+ init_after_loading_content : function() {
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+ this.sidebar = document.getElementById(this.config['sidebar_id']);
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+ this.outline = document.getElementById(this.config['outline_id']);
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+ this.container = document.getElementById(this.config['container_id']);
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+ this.loading_indicator = document.getElementsByClassName(this.config['loading_indicator_cls'])[0];
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+
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+
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+ {
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+ // Open the outline if nonempty
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+ var empty = true;
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+ var nodes = this.outline.childNodes;
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+ for (var i = 0, l = nodes.length; i < l; ++i) {
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+ var cur_node = nodes[i];
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+ if (cur_node.nodeName.toLowerCase() === 'ul') {
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+ empty = false;
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+ break;
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+ }
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+ }
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+ if (!empty)
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+ this.sidebar.classList.add('opened');
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+ }
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+
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+ this.find_pages();
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+ // do nothing if there's nothing
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+ if(this.pages.length == 0) return;
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+
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+ // disable dragging of background images
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+ disable_dragstart(document.getElementsByClassName(CSS_CLASS_NAMES.background_image));
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+
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+ if (this.config['key_handler'])
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+ this.register_key_handler();
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+
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+ var self = this;
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+
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+ if (this.config['hashchange_handler']) {
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+ window.addEventListener('hashchange', function(e) {
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+ self.navigate_to_dest(document.location.hash.substring(1));
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+ }, false);
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+ }
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+
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+ if (this.config['view_history_handler']) {
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+ window.addEventListener('popstate', function(e) {
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+ if(e.state) self.navigate_to_dest(e.state);
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+ }, false);
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+ }
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+
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+ // register schedule rendering
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+ // renew old schedules since scroll() may be called frequently
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+ this.container.addEventListener('scroll', function() {
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+ self.update_page_idx();
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+ self.schedule_render(true);
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+ }, false);
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+
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+ // handle links
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+ [this.container, this.outline].forEach(function(ele) {
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+ ele.addEventListener('click', self.link_handler.bind(self), false);
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+ });
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+
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+ this.initialize_radio_button();
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+ this.render();
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+ },
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+
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+ /*
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+ * set up this.pages and this.page_map
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+ * pages is an array holding all the Page objects
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+ * page-Map maps an original page number (in PDF) to the corresponding index in page
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+ */
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+ find_pages : function() {
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+ var new_pages = [];
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+ var new_page_map = {};
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+ var nodes = this.container.childNodes;
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+ for (var i = 0, l = nodes.length; i < l; ++i) {
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+ var cur_node = nodes[i];
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+ if ((cur_node.nodeType === Node.ELEMENT_NODE)
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+ && cur_node.classList.contains(CSS_CLASS_NAMES.page_frame)) {
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+ var p = new Page(cur_node);
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+ new_pages.push(p);
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+ new_page_map[p.num] = new_pages.length - 1;
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+ }
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+ }
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+ this.pages = new_pages;
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+ this.page_map = new_page_map;
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+ },
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+
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+ /**
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+ * @param{number} idx
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+ * @param{number=} pages_to_preload
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+ * @param{function(Page)=} callback
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+ *
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+ * TODO: remove callback -> promise ?
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+ */
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+ load_page : function(idx, pages_to_preload, callback) {
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+ var pages = this.pages;
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+ if (idx >= pages.length)
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+ return; // Page does not exist
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+
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+ var cur_page = pages[idx];
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+ if (cur_page.loaded)
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+ return; // Page is loaded
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+
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+ if (this.pages_loading[idx])
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+ return; // Page is already loading
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+
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+ var cur_page_ele = cur_page.page;
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+ var url = cur_page_ele.getAttribute('data-page-url');
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+ if (url) {
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+ this.pages_loading[idx] = true; // set semaphore
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+
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+ // add a copy of the loading indicator if not already present
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+ var new_loading_indicator = cur_page_ele.getElementsByClassName(this.config['loading_indicator_cls'])[0];
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+ if (typeof new_loading_indicator === 'undefined'){
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+ new_loading_indicator = this.loading_indicator.cloneNode(true);
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+ new_loading_indicator.classList.add('active');
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+ cur_page_ele.appendChild(new_loading_indicator);
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+ }
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+
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+ // load data
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+ {
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+ var self = this;
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+ var _idx = idx;
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+ var xhr = new XMLHttpRequest();
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+ xhr.open('GET', url, true);
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+ xhr.onload = function(){
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+ if (xhr.status === 200 || xhr.status === 0) {
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+ // find the page element in the data
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+ var div = document.createElement('div');
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+ div.innerHTML = xhr.responseText;
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+
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+ var new_page = null;
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+ var nodes = div.childNodes;
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+ for (var i = 0, l = nodes.length; i < l; ++i) {
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+ var cur_node = nodes[i];
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+ if ((cur_node.nodeType === Node.ELEMENT_NODE)
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+ && cur_node.classList.contains(CSS_CLASS_NAMES.page_frame)) {
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+ new_page = cur_node;
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+ break;
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+ }
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+ }
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+
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+ // replace the old page with loaded data
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+ // the loading indicator on this page should also be destroyed
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+ var p = self.pages[_idx];
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+ self.container.replaceChild(new_page, p.page);
|
|
|
+ p = new Page(new_page);
|
|
|
+ self.pages[_idx] = p;
|
|
|
+
|
|
|
+ p.hide();
|
|
|
+ p.rescale(self.scale);
|
|
|
+
|
|
|
+ // disable background image dragging
|
|
|
+ disable_dragstart(new_page.getElementsByClassName(CSS_CLASS_NAMES.background_image));
|
|
|
+
|
|
|
+ self.schedule_render(false);
|
|
|
+
|
|
|
+ if (callback){ callback(p); }
|
|
|
+ }
|
|
|
+
|
|
|
+ // Reset loading token
|
|
|
+ delete self.pages_loading[_idx];
|
|
|
+ };
|
|
|
+ xhr.send(null);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ // Concurrent prefetch of the next pages
|
|
|
+ if (pages_to_preload === undefined)
|
|
|
+ pages_to_preload = this.config['preload_pages'];
|
|
|
+
|
|
|
+ if (--pages_to_preload > 0) {
|
|
|
+ var self = this;
|
|
|
+ setTimeout(function() {
|
|
|
+ self.load_page(idx+1, pages_to_preload);
|
|
|
+ },0);
|
|
|
+ }
|
|
|
+ },
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Hide all pages that have no 'opened' class
|
|
|
+ * The 'opened' class will be added to visible pages by JavaScript
|
|
|
+ * We cannot add this in the default CSS because JavaScript may be disabled
|
|
|
+ */
|
|
|
+ pre_hide_pages : function() {
|
|
|
+ /* pages might have not been loaded yet, so add a CSS rule */
|
|
|
+ var s = '@media screen{.'+CSS_CLASS_NAMES.page_content_box+'{display:none;}}';
|
|
|
+ var n = document.createElement('style');
|
|
|
+ if (n.styleSheet) {
|
|
|
+ n.styleSheet.cssText = s;
|
|
|
+ } else {
|
|
|
+ n.appendChild(document.createTextNode(s));
|
|
|
+ }
|
|
|
+ document.head.appendChild(n);
|
|
|
+ },
|
|
|
+
|
|
|
+ /*
|
|
|
+ * show visible pages and hide invisible pages
|
|
|
+ */
|
|
|
+ render : function () {
|
|
|
+ var container = this.container;
|
|
|
+ /*
|
|
|
+ * show the pages that are 'nearly' visible -- it's right above or below the container
|
|
|
+ *
|
|
|
+ * all the y values are in the all-page element's coordinate system
|
|
|
+ */
|
|
|
+ var container_min_y = container.scrollTop;
|
|
|
+ var container_height = container.clientHeight;
|
|
|
+ var container_max_y = container_min_y + container_height;
|
|
|
+ var visible_min_y = container_min_y - container_height;
|
|
|
+ var visible_max_y = container_max_y + container_height;
|
|
|
+
|
|
|
+ var cur_page_fully_visible = false;
|
|
|
+ var cur_page_idx = this.cur_page_idx;
|
|
|
+ var max_visible_page_idx = cur_page_idx;
|
|
|
+ var max_visible_ratio = 0.0;
|
|
|
+
|
|
|
+ var pl = this.pages;
|
|
|
+ for (var i = 0, l = pl.length; i < l; ++i) {
|
|
|
+ var cur_page = pl[i];
|
|
|
+ var cur_page_ele = cur_page.page;
|
|
|
+ var page_min_y = cur_page_ele.offsetTop + cur_page_ele.clientTop;
|
|
|
+ var page_height = cur_page_ele.clientHeight;
|
|
|
+ var page_max_y = page_min_y + page_height;
|
|
|
+ if ((page_min_y <= visible_max_y) && (page_max_y >= visible_min_y))
|
|
|
+ {
|
|
|
+ // cur_page is 'nearly' visible, show it or load it
|
|
|
+ if (cur_page.loaded) {
|
|
|
+ cur_page.show();
|
|
|
+ } else {
|
|
|
+ this.load_page(i);
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ cur_page.hide();
|
|
|
+ }
|
|
|
+ }
|
|
|
+ },
|
|
|
+ /*
|
|
|
+ * update cur_page_idx and first_page_idx
|
|
|
+ * normally called upon scrolling
|
|
|
+ */
|
|
|
+ update_page_idx: function () {
|
|
|
+ var pages = this.pages;
|
|
|
+ var pages_len = pages.length;
|
|
|
+ // there is no chance that cur_page_idx or first_page_idx is modified
|
|
|
+ if (pages_len < 2) return;
|
|
|
+
|
|
|
+ var container = this.container;
|
|
|
+ var container_min_y = container.scrollTop;
|
|
|
+ var container_max_y = container_min_y + container.clientHeight;
|
|
|
+
|
|
|
+ // binary search for the first page
|
|
|
+ // whose bottom border is below the top border of the container
|
|
|
+ var first_idx = -1;
|
|
|
+ var last_idx = pages_len;
|
|
|
+ var rest_len = last_idx - first_idx;
|
|
|
+ // TODO: use current first_page_idx as a hint?
|
|
|
+ while(rest_len > 1) {
|
|
|
+ var idx = first_idx + Math.floor(rest_len / 2);
|
|
|
+ var cur_page_ele = pages[idx].page;
|
|
|
+ if (cur_page_ele.offsetTop + cur_page_ele.clientTop + cur_page_ele.clientHeight >= container_min_y) {
|
|
|
+ last_idx = idx;
|
|
|
+ } else {
|
|
|
+ first_idx = idx;
|
|
|
+ }
|
|
|
+ rest_len = last_idx - first_idx;
|
|
|
+ }
|
|
|
+
|
|
|
+ /*
|
|
|
+ * with malformed settings it is possible that no page is visible, e.g.
|
|
|
+ * - the container is to thin, which lies in the margin between two pages
|
|
|
+ * - all pages are completely above or below the container
|
|
|
+ * but we just assume that they won't happen.
|
|
|
+ */
|
|
|
+ this.first_page_idx = last_idx;
|
|
|
+
|
|
|
+ // find the page with largest visible area
|
|
|
+ var cur_page_idx = this.cur_page_idx;
|
|
|
+ var max_visible_page_idx = cur_page_idx;
|
|
|
+ var max_visible_ratio = 0.0;
|
|
|
+
|
|
|
+ for(var i = last_idx; i < pages_len; ++i) {
|
|
|
+ var cur_page_ele = pages[i].page;
|
|
|
+ var page_min_y = cur_page_ele.offsetTop + cur_page_ele.clientTop;
|
|
|
+ var page_height = cur_page_ele.clientHeight;
|
|
|
+ var page_max_y = page_min_y + page_height;
|
|
|
+ if (page_min_y > container_max_y) break;
|
|
|
+
|
|
|
+ // check the visible fraction of the page
|
|
|
+ var page_visible_ratio = ( Math.min(container_max_y, page_max_y)
|
|
|
+ - Math.max(container_min_y, page_min_y)
|
|
|
+ ) / page_height;
|
|
|
+
|
|
|
+ // stay with the current page if it is still fully visible
|
|
|
+ if ((i === cur_page_idx) && (Math.abs(page_visible_ratio - 1.0) <= EPS)) {
|
|
|
+ max_visible_page_idx = cur_page_idx;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (page_visible_ratio > max_visible_ratio) {
|
|
|
+ max_visible_ratio = page_visible_ratio;
|
|
|
+ max_visible_page_idx = i;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ this.cur_page_idx = max_visible_page_idx;
|
|
|
+ },
|
|
|
+
|
|
|
+ /**
|
|
|
+ * @param{boolean} renew renew the existing schedule instead of using the old one
|
|
|
+ */
|
|
|
+ schedule_render : function(renew) {
|
|
|
+ if (this.render_timer !== undefined) {
|
|
|
+ if (!renew) return;
|
|
|
+ clearTimeout(this.render_timer);
|
|
|
+ }
|
|
|
+
|
|
|
+ var self = this;
|
|
|
+ this.render_timer = setTimeout(function () {
|
|
|
+ /*
|
|
|
+ * render() may trigger load_page(), which may in turn trigger another render()
|
|
|
+ * so delete render_timer first
|
|
|
+ */
|
|
|
+ delete self.render_timer;
|
|
|
+ self.render();
|
|
|
+ }, this.config['render_timeout']);
|
|
|
+ },
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Handling key events, zooming, scrolling etc.
|
|
|
+ */
|
|
|
+ register_key_handler: function () {
|
|
|
+ /*
|
|
|
+ * When user try to zoom in/out using ctrl + +/- or mouse wheel
|
|
|
+ * handle this and prevent the default behaviours
|
|
|
+ *
|
|
|
+ * Code credit to PDF.js
|
|
|
+ */
|
|
|
+ var self = this;
|
|
|
+
|
|
|
+ // Firefox specific event, so that we can prevent browser from zooming
|
|
|
+ window.addEventListener('DOMMouseScroll', function(e) {
|
|
|
+ if (e.ctrlKey) {
|
|
|
+ e.preventDefault();
|
|
|
+ var container = self.container;
|
|
|
+ var rect = container.getBoundingClientRect();
|
|
|
+ var fixed_point = [e.clientX - rect['left'] - container.clientLeft
|
|
|
+ ,e.clientY - rect['top'] - container.clientTop];
|
|
|
+ self.rescale(Math.pow(self.config['scale_step'], e.detail), true, fixed_point);
|
|
|
+ }
|
|
|
+ }, false);
|
|
|
+
|
|
|
+ window.addEventListener('keydown', function(e) {
|
|
|
+ var handled = false;
|
|
|
+ /*
|
|
|
+ var cmd = (e.ctrlKey ? 1 : 0)
|
|
|
+ | (e.altKey ? 2 : 0)
|
|
|
+ | (e.shiftKey ? 4 : 0)
|
|
|
+ | (e.metaKey ? 8 : 0)
|
|
|
+ ;
|
|
|
+ */
|
|
|
+ var with_ctrl = e.ctrlKey || e.metaKey;
|
|
|
+ var with_alt = e.altKey;
|
|
|
+ switch (e.keyCode) {
|
|
|
+ case 61: // FF/Mac '='
|
|
|
+ case 107: // FF '+' and '='
|
|
|
+ case 187: // Chrome '+'
|
|
|
+ if (with_ctrl){
|
|
|
+ self.rescale(1.0 / self.config['scale_step'], true);
|
|
|
+ handled = true;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case 173: // FF/Mac '-'
|
|
|
+ case 109: // FF '-'
|
|
|
+ case 189: // Chrome '-'
|
|
|
+ if (with_ctrl){
|
|
|
+ self.rescale(self.config['scale_step'], true);
|
|
|
+ handled = true;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case 48: // '0'
|
|
|
+ if (with_ctrl){
|
|
|
+ self.rescale(0, false);
|
|
|
+ handled = true;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case 33: // Page UP:
|
|
|
+ if (with_alt) { // alt-pageup -> scroll one page up
|
|
|
+ self.scroll_to(self.cur_page_idx - 1);
|
|
|
+ } else { // pageup -> scroll one screen up
|
|
|
+ self.container.scrollTop -= self.container.clientHeight;
|
|
|
+ }
|
|
|
+ handled = true;
|
|
|
+ break;
|
|
|
+ case 34: // Page DOWN
|
|
|
+ if (with_alt) { // alt-pagedown -> scroll one page down
|
|
|
+ self.scroll_to(self.cur_page_idx + 1);
|
|
|
+ } else { // pagedown -> scroll one screen down
|
|
|
+ self.container.scrollTop += self.container.clientHeight;
|
|
|
+ }
|
|
|
+ handled = true;
|
|
|
+ break;
|
|
|
+ case 35: // End
|
|
|
+ self.container.scrollTop = self.container.scrollHeight;
|
|
|
+ handled = true;
|
|
|
+ break;
|
|
|
+ case 36: // Home
|
|
|
+ self.container.scrollTop = 0;
|
|
|
+ handled = true;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ if (handled) {
|
|
|
+ e.preventDefault();
|
|
|
+ return;
|
|
|
+ }
|
|
|
+ }, false);
|
|
|
+ },
|
|
|
+
|
|
|
+ /**
|
|
|
+ * @param{number} ratio
|
|
|
+ * @param{boolean} is_relative
|
|
|
+ * @param{Array.<number>=} fixed_point preserve the position (relative to the top-left corner of the viewer) after rescaling
|
|
|
+ */
|
|
|
+ rescale : function (ratio, is_relative, fixed_point) {
|
|
|
+ var old_scale = this.scale;
|
|
|
+ var new_scale = old_scale;
|
|
|
+ // set new scale
|
|
|
+ if (ratio === 0) {
|
|
|
+ new_scale = 1;
|
|
|
+ is_relative = false;
|
|
|
+ } else if (is_relative)
|
|
|
+ new_scale *= ratio;
|
|
|
+ else
|
|
|
+ new_scale = ratio;
|
|
|
+
|
|
|
+ this.scale = new_scale;
|
|
|
+
|
|
|
+ if (!fixed_point)
|
|
|
+ fixed_point = [0,0];
|
|
|
+
|
|
|
+ // translate fixed_point to the coordinate system of all pages
|
|
|
+ var container = this.container;
|
|
|
+ fixed_point[0] += container.scrollLeft;
|
|
|
+ fixed_point[1] += container.scrollTop;
|
|
|
+
|
|
|
+ // find the visible page that contains the fixed point
|
|
|
+ // if the fixed point lies between two pages (including their borders), it's contained in the first one
|
|
|
+ var pl = this.pages;
|
|
|
+ var pl_len = pl.length;
|
|
|
+ for (var i = this.first_page_idx; i < pl_len; ++i) {
|
|
|
+ var p = pl[i].page;
|
|
|
+ if (p.offsetTop + p.clientTop >= fixed_point[1])
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ var fixed_point_page_idx = i - 1;
|
|
|
+
|
|
|
+ // determine the new scroll position
|
|
|
+ // each-value consists of two parts, one inside the page, which is affected by rescaling,
|
|
|
+ // the other is outside, (e.g. borders and margins), which is not affected
|
|
|
+
|
|
|
+ // if the fixed_point is above the first page, use the first page as the reference
|
|
|
+ if (fixed_point_page_idx < 0)
|
|
|
+ fixed_point_page_idx = 0;
|
|
|
+
|
|
|
+ var fp_p = pl[fixed_point_page_idx].page;
|
|
|
+ var fp_p_width = fp_p.clientWidth;
|
|
|
+ var fp_p_height = fp_p.clientHeight;
|
|
|
+
|
|
|
+ var fp_x_ref = fp_p.offsetLeft + fp_p.clientLeft;
|
|
|
+ var fp_x_inside = fixed_point[0] - fp_x_ref;
|
|
|
+ if (fp_x_inside < 0)
|
|
|
+ fp_x_inside = 0;
|
|
|
+ else if (fp_x_inside > fp_p_width)
|
|
|
+ fp_x_inside = fp_p_width;
|
|
|
+
|
|
|
+ var fp_y_ref = fp_p.offsetTop + fp_p.clientTop;
|
|
|
+ var fp_y_inside = fixed_point[1] - fp_y_ref;
|
|
|
+ if (fp_y_inside < 0)
|
|
|
+ fp_y_inside = 0;
|
|
|
+ else if (fp_y_inside > fp_p_height)
|
|
|
+ fp_y_inside = fp_p_height;
|
|
|
+
|
|
|
+ // Rescale pages
|
|
|
+ for (var i = 0; i < pl_len; ++i)
|
|
|
+ pl[i].rescale(new_scale);
|
|
|
+
|
|
|
+ // Correct container scroll to keep view aligned while zooming
|
|
|
+ container.scrollLeft += fp_x_inside / old_scale * new_scale + fp_p.offsetLeft + fp_p.clientLeft - fp_x_inside - fp_x_ref;
|
|
|
+ container.scrollTop += fp_y_inside / old_scale * new_scale + fp_p.offsetTop + fp_p.clientTop - fp_y_inside - fp_y_ref;
|
|
|
+
|
|
|
+ // some pages' visibility may be toggled, wait for next render()
|
|
|
+ // renew old schedules since rescale() may be called frequently
|
|
|
+ this.schedule_render(true);
|
|
|
+ },
|
|
|
+
|
|
|
+ fit_width : function () {
|
|
|
+ var page_idx = this.cur_page_idx;
|
|
|
+ this.rescale(this.container.clientWidth / this.pages[page_idx].width(), true);
|
|
|
+ this.scroll_to(page_idx);
|
|
|
+ },
|
|
|
+
|
|
|
+ fit_height : function () {
|
|
|
+ var page_idx = this.cur_page_idx;
|
|
|
+ this.rescale(this.container.clientHeight / this.pages[page_idx].height(), true);
|
|
|
+ this.scroll_to(page_idx);
|
|
|
+ },
|
|
|
+ /**
|
|
|
+ * @param{Node} ele
|
|
|
+ */
|
|
|
+ get_containing_page : function(ele) {
|
|
|
+ /* get the page obj containing obj */
|
|
|
+ while(ele) {
|
|
|
+ if ((ele.nodeType === Node.ELEMENT_NODE)
|
|
|
+ && ele.classList.contains(CSS_CLASS_NAMES.page_frame)) {
|
|
|
+ /*
|
|
|
+ * Get original page number and map it to index of pages
|
|
|
+ * TODO: store the index on the dom element
|
|
|
+ */
|
|
|
+ var pn = get_page_number(/** @type{Element} */(ele));
|
|
|
+ var pm = this.page_map;
|
|
|
+ return (pn in pm) ? this.pages[pm[pn]] : null;
|
|
|
+ }
|
|
|
+ ele = ele.parentNode;
|
|
|
+ }
|
|
|
+ return null;
|
|
|
+ },
|
|
|
+
|
|
|
+ /**
|
|
|
+ * @param{Event} e
|
|
|
+ */
|
|
|
+ link_handler : function (e) {
|
|
|
+ var target = /** @type{Node} */(e.target);
|
|
|
+ var detail_str = /** @type{string} */ (target.getAttribute('data-dest-detail'));
|
|
|
+ if (!detail_str) return;
|
|
|
+
|
|
|
+ if (this.config['view_history_handler']) {
|
|
|
+ try {
|
|
|
+ var cur_hash = this.get_current_view_hash();
|
|
|
+ window.history.replaceState(cur_hash, '', '#' + cur_hash);
|
|
|
+ window.history.pushState(detail_str, '', '#' + detail_str);
|
|
|
+ } catch(ex) { }
|
|
|
+ }
|
|
|
+ this.navigate_to_dest(detail_str, this.get_containing_page(target));
|
|
|
+ e.preventDefault();
|
|
|
+ },
|
|
|
+
|
|
|
+ /**
|
|
|
+ * @param{string} detail_str may come from user provided hashtag, need sanitizing
|
|
|
+ * @param{Page=} src_page page containing the source event (e.g. link)
|
|
|
+ */
|
|
|
+ navigate_to_dest : function(detail_str, src_page) {
|
|
|
+ try {
|
|
|
+ var detail = JSON.parse(detail_str);
|
|
|
+ } catch(e) {
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ if(!(detail instanceof Array)) return;
|
|
|
+
|
|
|
+ var target_page_no = detail[0];
|
|
|
+ var page_map = this.page_map;
|
|
|
+ if (!(target_page_no in page_map)) return;
|
|
|
+ var target_page_idx = page_map[target_page_no];
|
|
|
+ var target_page = this.pages[target_page_idx];
|
|
|
+
|
|
|
+ for (var i = 2, l = detail.length; i < l; ++i) {
|
|
|
+ var d = detail[i];
|
|
|
+ if(!((d === null) || (typeof d === 'number')))
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ while(detail.length < 6)
|
|
|
+ detail.push(null);
|
|
|
+
|
|
|
+ // cur_page might be undefined, e.g. from Outline
|
|
|
+ var cur_page = src_page || this.pages[this.cur_page_idx];
|
|
|
+
|
|
|
+ var cur_pos = cur_page.view_position();
|
|
|
+ cur_pos = transform(cur_page.ictm, [cur_pos[0], cur_page.height()-cur_pos[1]]);
|
|
|
+
|
|
|
+ var zoom = this.scale;
|
|
|
+ var pos = [0,0];
|
|
|
+ var upside_down = true;
|
|
|
+ var ok = false;
|
|
|
+
|
|
|
+ // position specified in `detail` are in the raw coordinate system of the page (unscaled)
|
|
|
+ var scale = this.scale;
|
|
|
+ // TODO: fitb*
|
|
|
+ // TODO: BBox
|
|
|
+ switch(detail[1]) {
|
|
|
+ case 'XYZ':
|
|
|
+ pos = [ (detail[2] === null) ? cur_pos[0] : detail[2] * scale
|
|
|
+ , (detail[3] === null) ? cur_pos[1] : detail[3] * scale ];
|
|
|
+ zoom = detail[4];
|
|
|
+ if ((zoom === null) || (zoom === 0))
|
|
|
+ zoom = this.scale;
|
|
|
+ ok = true;
|
|
|
+ break;
|
|
|
+ case 'Fit':
|
|
|
+ case 'FitB':
|
|
|
+ pos = [0,0];
|
|
|
+ ok = true;
|
|
|
+ break;
|
|
|
+ case 'FitH':
|
|
|
+ case 'FitBH':
|
|
|
+ pos = [0, (detail[2] === null) ? cur_pos[1] : detail[2] * scale];
|
|
|
+ ok = true;
|
|
|
+ break;
|
|
|
+ case 'FitV':
|
|
|
+ case 'FitBV':
|
|
|
+ pos = [(detail[2] === null) ? cur_pos[0] : detail[2] * scale, 0];
|
|
|
+ ok = true;
|
|
|
+ break;
|
|
|
+ case 'FitR':
|
|
|
+ /* locate the top-left corner of the rectangle */
|
|
|
+ // TODO
|
|
|
+ pos = [detail[2] * scale, detail[5] * scale];
|
|
|
+ upside_down = false;
|
|
|
+ ok = true;
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!ok) return;
|
|
|
+
|
|
|
+ this.rescale(zoom, false);
|
|
|
+
|
|
|
+ var self = this;
|
|
|
+ /**
|
|
|
+ * page should have type Page
|
|
|
+ * @param{Page} page
|
|
|
+ */
|
|
|
+ var transform_and_scroll = function(page) {
|
|
|
+ pos = transform(page.ctm, pos);
|
|
|
+ if (upside_down) {
|
|
|
+ pos[1] = page.height() - pos[1];
|
|
|
+ }
|
|
|
+ self.scroll_to(target_page_idx, pos);
|
|
|
+ };
|
|
|
+
|
|
|
+ if (target_page.loaded) {
|
|
|
+ transform_and_scroll(target_page);
|
|
|
+ } else {
|
|
|
+ // TODO: scroll_to may finish before load_page
|
|
|
+
|
|
|
+ // Scroll to the exact position once loaded.
|
|
|
+ this.load_page(target_page_idx, undefined, transform_and_scroll);
|
|
|
+
|
|
|
+ // In the meantime page gets loaded, scroll approximately position for maximum responsiveness.
|
|
|
+ this.scroll_to(target_page_idx);
|
|
|
+ }
|
|
|
+ },
|
|
|
+
|
|
|
+ /**
|
|
|
+ * @param{number} page_idx
|
|
|
+ * @param{Array.<number>=} pos [x,y] where (0,0) is the top-left corner
|
|
|
+ */
|
|
|
+ scroll_to : function(page_idx, pos) {
|
|
|
+ var pl = this.pages;
|
|
|
+ if ((page_idx < 0) || (page_idx >= pl.length)) return;
|
|
|
+ var target_page = pl[page_idx];
|
|
|
+ var cur_target_pos = target_page.view_position();
|
|
|
+
|
|
|
+ if (pos === undefined)
|
|
|
+ pos = [0,0];
|
|
|
+
|
|
|
+ var container = this.container;
|
|
|
+ container.scrollLeft += pos[0] - cur_target_pos[0];
|
|
|
+ container.scrollTop += pos[1] - cur_target_pos[1];
|
|
|
+ },
|
|
|
+
|
|
|
+ /**
|
|
|
+ * generate the hash for the current view
|
|
|
+ */
|
|
|
+ get_current_view_hash : function() {
|
|
|
+ var detail = [];
|
|
|
+ var cur_page = this.pages[this.cur_page_idx];
|
|
|
+
|
|
|
+ detail.push(cur_page.num);
|
|
|
+ detail.push('XYZ');
|
|
|
+
|
|
|
+ var cur_pos = cur_page.view_position();
|
|
|
+ cur_pos = transform(cur_page.ictm, [cur_pos[0], cur_page.height()-cur_pos[1]]);
|
|
|
+ detail.push(cur_pos[0] / this.scale);
|
|
|
+ detail.push(cur_pos[1] / this.scale);
|
|
|
+
|
|
|
+ detail.push(this.scale);
|
|
|
+
|
|
|
+ return JSON.stringify(detail);
|
|
|
+ }
|
|
|
+};
|
|
|
+
|
|
|
+// export pdf2htmlEX.Viewer
|
|
|
+pdf2htmlEX['Viewer'] = Viewer;
|
dever
