diff core/misc/tableheader.js @ 0:c75dbcec494b

Initial commit from drush-created site

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/misc/tableheader.js	Thu Jul 05 14:24:15 2018 +0000
@@ -0,0 +1,167 @@
+/**
+* DO NOT EDIT THIS FILE.
+* See the following change record for more information,
+* https://www.drupal.org/node/2815083
+* @preserve
+**/
+
+(function ($, Drupal, displace) {
+  Drupal.behaviors.tableHeader = {
+    attach: function attach(context) {
+      $(window).one('scroll.TableHeaderInit', { context: context }, tableHeaderInitHandler);
+    }
+  };
+
+  function scrollValue(position) {
+    return document.documentElement[position] || document.body[position];
+  }
+
+  function tableHeaderInitHandler(e) {
+    var $tables = $(e.data.context).find('table.sticky-enabled').once('tableheader');
+    var il = $tables.length;
+    for (var i = 0; i < il; i++) {
+      TableHeader.tables.push(new TableHeader($tables[i]));
+    }
+    forTables('onScroll');
+  }
+
+  function forTables(method, arg) {
+    var tables = TableHeader.tables;
+    var il = tables.length;
+    for (var i = 0; i < il; i++) {
+      tables[i][method](arg);
+    }
+  }
+
+  function tableHeaderResizeHandler(e) {
+    forTables('recalculateSticky');
+  }
+
+  function tableHeaderOnScrollHandler(e) {
+    forTables('onScroll');
+  }
+
+  function tableHeaderOffsetChangeHandler(e, offsets) {
+    forTables('stickyPosition', offsets.top);
+  }
+
+  $(window).on({
+    'resize.TableHeader': tableHeaderResizeHandler,
+
+    'scroll.TableHeader': tableHeaderOnScrollHandler
+  });
+
+  $(document).on({
+    'columnschange.TableHeader': tableHeaderResizeHandler,
+
+    'drupalViewportOffsetChange.TableHeader': tableHeaderOffsetChangeHandler
+  });
+
+  function TableHeader(table) {
+    var $table = $(table);
+
+    this.$originalTable = $table;
+
+    this.$originalHeader = $table.children('thead');
+
+    this.$originalHeaderCells = this.$originalHeader.find('> tr > th');
+
+    this.displayWeight = null;
+    this.$originalTable.addClass('sticky-table');
+    this.tableHeight = $table[0].clientHeight;
+    this.tableOffset = this.$originalTable.offset();
+
+    this.$originalTable.on('columnschange', { tableHeader: this }, function (e, display) {
+      var tableHeader = e.data.tableHeader;
+      if (tableHeader.displayWeight === null || tableHeader.displayWeight !== display) {
+        tableHeader.recalculateSticky();
+      }
+      tableHeader.displayWeight = display;
+    });
+
+    this.createSticky();
+  }
+
+  $.extend(TableHeader, {
+    tables: []
+  });
+
+  $.extend(TableHeader.prototype, {
+    minHeight: 100,
+
+    tableOffset: null,
+
+    tableHeight: null,
+
+    stickyVisible: false,
+
+    createSticky: function createSticky() {
+      var $stickyHeader = this.$originalHeader.clone(true);
+
+      this.$stickyTable = $('<table class="sticky-header"/>').css({
+        visibility: 'hidden',
+        position: 'fixed',
+        top: '0px'
+      }).append($stickyHeader).insertBefore(this.$originalTable);
+
+      this.$stickyHeaderCells = $stickyHeader.find('> tr > th');
+
+      this.recalculateSticky();
+    },
+    stickyPosition: function stickyPosition(offsetTop, offsetLeft) {
+      var css = {};
+      if (typeof offsetTop === 'number') {
+        css.top = offsetTop + 'px';
+      }
+      if (typeof offsetLeft === 'number') {
+        css.left = this.tableOffset.left - offsetLeft + 'px';
+      }
+      return this.$stickyTable.css(css);
+    },
+    checkStickyVisible: function checkStickyVisible() {
+      var scrollTop = scrollValue('scrollTop');
+      var tableTop = this.tableOffset.top - displace.offsets.top;
+      var tableBottom = tableTop + this.tableHeight;
+      var visible = false;
+
+      if (tableTop < scrollTop && scrollTop < tableBottom - this.minHeight) {
+        visible = true;
+      }
+
+      this.stickyVisible = visible;
+      return visible;
+    },
+    onScroll: function onScroll(e) {
+      this.checkStickyVisible();
+
+      this.stickyPosition(null, scrollValue('scrollLeft'));
+      this.$stickyTable.css('visibility', this.stickyVisible ? 'visible' : 'hidden');
+    },
+    recalculateSticky: function recalculateSticky(event) {
+      this.tableHeight = this.$originalTable[0].clientHeight;
+
+      displace.offsets.top = displace.calculateOffset('top');
+      this.tableOffset = this.$originalTable.offset();
+      this.stickyPosition(displace.offsets.top, scrollValue('scrollLeft'));
+
+      var $that = null;
+      var $stickyCell = null;
+      var display = null;
+
+      var il = this.$originalHeaderCells.length;
+      for (var i = 0; i < il; i++) {
+        $that = $(this.$originalHeaderCells[i]);
+        $stickyCell = this.$stickyHeaderCells.eq($that.index());
+        display = $that.css('display');
+        if (display !== 'none') {
+          $stickyCell.css({ width: $that.css('width'), display: display });
+        } else {
+          $stickyCell.css('display', 'none');
+        }
+      }
+      this.$stickyTable.css('width', this.$originalTable.outerWidth());
+    }
+  });
+
+  Drupal.TableHeader = TableHeader;
+})(jQuery, Drupal, window.parent.Drupal.displace);
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