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controller.moveBefore(column, index);\n\n      this.exchangeWith = (index) => controller.exchangeWith(column, index);\n\n      Object.defineProperty(this, 'columnId', { get: () => column.id });\n    }\n\n    function ColumnController(controller, columns, header) {\n\n      this.header = header;\n      this.css = {};\n      this.mapTo = columns.length;\n      this.id = columns.length;\n\n      // controller api methods\n\n      this.applyLayout = function(layout) {\n        this.css = angular.extend({}, layout.css);\n        this.mapTo = layout.mapTo;\n        applyCss(this.header, this.css);\n      };\n\n      this.moveBefore = function(target) {\n        if (target) {\n          moveBefore(header, target.header);\n          controller.forEachRow((row) => moveBefore(row[this.id], row[target.id]));\n        } else {\n          moveLast(header);\n          controller.forEachRow((row) => moveLast(row[this.id]));\n        }\n      };\n\n      this.columnFromPoint = function(x, y) {\n        if (insidePoint(header, x, y)) {\n          return this;\n        }\n        let result = null;\n        controller.forEachRow((row) =>\n          result = insidePoint(row[this.id], x, y) ? this : result\n        );\n        return result;\n      };\n\n      this.applyCss = function(target) {\n        applyCss(target, this.css);\n      };\n\n      // function definitions\n\n      function insidePoint(element, x, y) {\n        let offset = element.offset();\n        if (x < offset.left || offset.left + element.outerWidth(true) < x)\n          return false;\n        if (y < offset.top || offset.top + element.outerHeight(true) < y)\n          return false;\n        return true;\n      }\n\n      function moveBefore(element, target) {\n        element.detach();\n        target.before(element);\n      }\n\n      function moveLast(element) {\n        let parent = element.parent();\n        element.detach();\n        parent.append(element);\n      }\n\n      function applyCss(target, css) {\n        target.removeAttr('style');\n        for (let attr in css) {\n          if (css.hasOwnProperty(attr)) {\n            target.css(attr, css[attr]);\n          }\n        }\n      }\n\n    }\n\n    function GridController(scrollViewport) {\n      let columns = [];\n      let rowMap = new Map();\n\n      $timeout(() => {\n        scrollViewport.adapter.publicContext.gridAdapter = new GridAdapter(this);\n        scrollViewport.adapter.transform = (scope, item) => transform(rowMap.get(scope), item);\n      });\n\n      this.registerColumn = function(header) {\n        columns.push(new ColumnController(this, columns, header));\n      };\n\n      this.registerCell = function(scope, cell) {\n        let row = rowMap.get(scope);\n        if (!row) {\n          row = [];\n          rowMap.set(scope, row);\n        }\n        if (row.length >= columns.length) {\n          return false;\n        }\n        row.push(cell);\n        return true;\n      };\n\n      this.unregisterCell = function(scope, cell) {\n        let row = rowMap.get(scope);\n        let i = row.indexOf(cell);\n        row.splice(i, 1);\n        if (!row.length) {\n          rowMap.delete(scope);\n        }\n      };\n\n      this.forEachRow = function(callback) {\n        rowMap.forEach(callback);\n      };\n\n      this.getColumns = function() {\n        let result = [];\n        columns.slice()\n          .sort((a, b) => a.mapTo - b.mapTo)\n          .forEach((column) => result.push(new ColumnAdapter(this, column)));\n        return result;\n      };\n\n      this.getLayout = function() {\n        let result = [];\n        columns.forEach((column, index) => result.push({\n          index: index,\n          css: angular.extend({}, column.css),\n          mapTo: column.mapTo\n        }));\n        return result;\n      };\n\n      this.applyLayout = function(layouts) {\n        if (!layouts || layouts.length != columns.length) {\n          throw new Error('Failed to apply layout - number of layouts should match number of columns');\n        }\n        layouts.forEach((layout, index) => columns[index].applyLayout(layout));\n        transform(columns.map((column) => column.header));\n        rowMap.forEach((row) => transform(row));\n      };\n\n      this.moveBefore = function(selected, target) {\n        let index = target;\n\n        if (target % 1 !== 0) {\n          index = target ? columns[target.columnId].mapTo : columns.length;\n        }\n        if (index < 0 || index > columns.length) {\n          return; // throw an error?\n        }\n\n        let mapTo = selected.mapTo,\n          next = null;\n        index -= mapTo < index ? 1 : 0;\n\n        columns.forEach(c => {\n          c.mapTo -= c.mapTo > mapTo ? 1 : 0;\n          c.mapTo += c.mapTo >= index ? 1 : 0;\n          next = c.mapTo === index + 1 ? c : next;\n        });\n\n        selected.mapTo = index;\n        selected.moveBefore(next);\n      };\n\n      this.exchangeWith = function(selected, index) {\n        if (index < 0 || index >= columns.length) {\n          return;\n        }\n        columns.find(c => c.mapTo === index).mapTo = selected.mapTo;\n        selected.mapTo = index;\n      };\n\n      this.columnFromPoint = function(x, y) {\n        let column = columns.find(col => col.columnFromPoint(x, y));\n        return column ? new ColumnAdapter(this, column) : undefined;\n      };\n\n      // function definitions\n\n      function transform(row) {\n        let parent = row[0].parent();\n        let visible = [];\n\n        row.forEach((cell, index) => {\n          columns[index].applyCss(cell);\n          visible[columns[index].mapTo] = row[index];\n          row[index].detach();\n        });\n\n        visible.forEach(cell => parent.append(cell));\n      }\n\n    }\n\n    return {\n      require: ['^^uiScrollViewport'],\n      restrict: 'A',\n      link: ($scope, element, $attr, controllers) => {\n        controllers[0].gridController = controllers[0].gridController || new GridController(controllers[0]);\n        controllers[0].gridController.registerColumn(element);\n      }\n    };\n  }])\n\n.directive('uiScrollTd', function() {\n  return {\n    require: ['?^^uiScrollViewport'],\n    restrict: 'A',\n    link: ($scope, element, $attr, controllers) => {\n      if (!controllers[0]) {\n        return;\n      }\n      let scope = $scope;\n      let tdInitializer = $scope.uiScrollTdInitializer;\n      if (!tdInitializer) {\n        tdInitializer = $scope.uiScrollTdInitializer = {\n          linking: true\n        };\n      }\n      if (!tdInitializer.linking) {\n        scope = tdInitializer.scope;\n      }\n      let gridController = controllers[0].gridController;\n      if (gridController.registerCell(scope, element)) {\n        $scope.$on('$destroy', () => gridController.unregisterCell(scope, element));\n      }\n      if (!tdInitializer.linking) {\n        tdInitializer.onLink();\n      }\n    }\n  };\n});\n\n\n\n// WEBPACK FOOTER //\n// ./src/ui-scroll-grid.js"],"sourceRoot":""}