@almaobservatory/ngx-datatable
Version:
ngx-datatable is an Angular table grid component for presenting large and complex data.
146 lines • 18.6 kB
JavaScript
import { columnsByPin, columnsTotalWidth } from './column';
/**
* Calculates the Total Flex Grow
*/
export function getTotalFlexGrow(columns) {
let totalFlexGrow = 0;
for (const c of columns) {
totalFlexGrow += c.flexGrow || 0;
}
return totalFlexGrow;
}
/**
* Adjusts the column widths.
* Inspired by: https://github.com/facebook/fixed-data-table/blob/master/src/FixedDataTableWidthHelper.js
*/
export function adjustColumnWidths(allColumns, expectedWidth) {
const columnsWidth = columnsTotalWidth(allColumns);
const totalFlexGrow = getTotalFlexGrow(allColumns);
const colsByGroup = columnsByPin(allColumns);
if (columnsWidth !== expectedWidth) {
scaleColumns(colsByGroup, expectedWidth, totalFlexGrow);
}
}
/**
* Resizes columns based on the flexGrow property, while respecting manually set widths
*/
function scaleColumns(colsByGroup, maxWidth, totalFlexGrow) {
// calculate total width and flexgrow points for coulumns that can be resized
for (const attr in colsByGroup) {
for (const column of colsByGroup[attr]) {
if (!column.canAutoResize) {
maxWidth -= column.width;
totalFlexGrow -= column.flexGrow ? column.flexGrow : 0;
}
else {
column.width = 0;
}
}
}
const hasMinWidth = {};
let remainingWidth = maxWidth;
// resize columns until no width is left to be distributed
do {
const widthPerFlexPoint = remainingWidth / totalFlexGrow;
remainingWidth = 0;
for (const attr in colsByGroup) {
for (const column of colsByGroup[attr]) {
// if the column can be resize and it hasn't reached its minimum width yet
if (column.canAutoResize && !hasMinWidth[column.prop]) {
const newWidth = column.width + column.flexGrow * widthPerFlexPoint;
if (column.minWidth !== undefined && newWidth < column.minWidth) {
remainingWidth += newWidth - column.minWidth;
column.width = column.minWidth;
hasMinWidth[column.prop] = true;
}
else {
column.width = newWidth;
}
}
}
}
} while (remainingWidth !== 0);
}
/**
* Forces the width of the columns to
* distribute equally but overflowing when necessary
*
* Rules:
*
* - If combined withs are less than the total width of the grid,
* proportion the widths given the min / max / normal widths to fill the width.
*
* - If the combined widths, exceed the total width of the grid,
* use the standard widths.
*
* - If a column is resized, it should always use that width
*
* - The proportional widths should never fall below min size if specified.
*
* - If the grid starts off small but then becomes greater than the size ( + / - )
* the width should use the original width; not the newly proportioned widths.
*/
export function forceFillColumnWidths(allColumns, expectedWidth, startIdx, allowBleed, defaultColWidth = 300) {
const columnsToResize = allColumns.slice(startIdx + 1, allColumns.length).filter(c => {
return c.canAutoResize !== false;
});
for (const column of columnsToResize) {
if (!column.$$oldWidth) {
column.$$oldWidth = column.width;
}
}
let additionWidthPerColumn = 0;
let exceedsWindow = false;
let contentWidth = getContentWidth(allColumns, defaultColWidth);
let remainingWidth = expectedWidth - contentWidth;
const columnsProcessed = [];
const remainingWidthLimit = 1; // when to stop
// This loop takes care of the
do {
additionWidthPerColumn = remainingWidth / columnsToResize.length;
exceedsWindow = contentWidth >= expectedWidth;
for (const column of columnsToResize) {
if (exceedsWindow && allowBleed) {
column.width = column.$$oldWidth || column.width || defaultColWidth;
}
else {
const newSize = (column.width || defaultColWidth) + additionWidthPerColumn;
if (column.minWidth && newSize < column.minWidth) {
column.width = column.minWidth;
columnsProcessed.push(column);
}
else if (column.maxWidth && newSize > column.maxWidth) {
column.width = column.maxWidth;
columnsProcessed.push(column);
}
else {
column.width = newSize;
}
}
column.width = Math.max(0, column.width);
}
contentWidth = getContentWidth(allColumns);
remainingWidth = expectedWidth - contentWidth;
removeProcessedColumns(columnsToResize, columnsProcessed);
} while (remainingWidth > remainingWidthLimit && columnsToResize.length !== 0);
}
/**
* Remove the processed columns from the current active columns.
*/
function removeProcessedColumns(columnsToResize, columnsProcessed) {
for (const column of columnsProcessed) {
const index = columnsToResize.indexOf(column);
columnsToResize.splice(index, 1);
}
}
/**
* Gets the width of the columns
*/
function getContentWidth(allColumns, defaultColWidth = 300) {
let contentWidth = 0;
for (const column of allColumns) {
contentWidth += column.width || defaultColWidth;
}
return contentWidth;
}
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{ columnsByPin, columnsTotalWidth } from './column';\r\n\r\n/**\r\n * Calculates the Total Flex Grow\r\n */\r\nexport function getTotalFlexGrow(columns: any[]) {\r\n  let totalFlexGrow = 0;\r\n\r\n  for (const c of columns) {\r\n    totalFlexGrow += c.flexGrow || 0;\r\n  }\r\n\r\n  return totalFlexGrow;\r\n}\r\n\r\n/**\r\n * Adjusts the column widths.\r\n * Inspired by: https://github.com/facebook/fixed-data-table/blob/master/src/FixedDataTableWidthHelper.js\r\n */\r\nexport function adjustColumnWidths(allColumns: any, expectedWidth: any) {\r\n  const columnsWidth = columnsTotalWidth(allColumns);\r\n  const totalFlexGrow = getTotalFlexGrow(allColumns);\r\n  const colsByGroup = columnsByPin(allColumns);\r\n\r\n  if (columnsWidth !== expectedWidth) {\r\n    scaleColumns(colsByGroup, expectedWidth, totalFlexGrow);\r\n  }\r\n}\r\n\r\n/**\r\n * Resizes columns based on the flexGrow property, while respecting manually set widths\r\n */\r\nfunction scaleColumns(colsByGroup: any, maxWidth: any, totalFlexGrow: any) {\r\n  // calculate total width and flexgrow points for coulumns that can be resized\r\n  for (const attr in colsByGroup) {\r\n    for (const column of colsByGroup[attr]) {\r\n      if (!column.canAutoResize) {\r\n        maxWidth -= column.width;\r\n        totalFlexGrow -= column.flexGrow ? column.flexGrow : 0;\r\n      } else {\r\n        column.width = 0;\r\n      }\r\n    }\r\n  }\r\n\r\n  const hasMinWidth = {};\r\n  let remainingWidth = maxWidth;\r\n\r\n  // resize columns until no width is left to be distributed\r\n  do {\r\n    const widthPerFlexPoint = remainingWidth / totalFlexGrow;\r\n    remainingWidth = 0;\r\n\r\n    for (const attr in colsByGroup) {\r\n      for (const column of colsByGroup[attr]) {\r\n        // if the column can be resize and it hasn't reached its minimum width yet\r\n        if (column.canAutoResize && !hasMinWidth[column.prop]) {\r\n          const newWidth = column.width + column.flexGrow * widthPerFlexPoint;\r\n          if (column.minWidth !== undefined && newWidth < column.minWidth) {\r\n            remainingWidth += newWidth - column.minWidth;\r\n            column.width = column.minWidth;\r\n            hasMinWidth[column.prop] = true;\r\n          } else {\r\n            column.width = newWidth;\r\n          }\r\n        }\r\n      }\r\n    }\r\n  } while (remainingWidth !== 0);\r\n}\r\n\r\n/**\r\n * Forces the width of the columns to\r\n * distribute equally but overflowing when necessary\r\n *\r\n * Rules:\r\n *\r\n *  - If combined withs are less than the total width of the grid,\r\n *    proportion the widths given the min / max / normal widths to fill the width.\r\n *\r\n *  - If the combined widths, exceed the total width of the grid,\r\n *    use the standard widths.\r\n *\r\n *  - If a column is resized, it should always use that width\r\n *\r\n *  - The proportional widths should never fall below min size if specified.\r\n *\r\n *  - If the grid starts off small but then becomes greater than the size ( + / - )\r\n *    the width should use the original width; not the newly proportioned widths.\r\n */\r\nexport function forceFillColumnWidths(\r\n  allColumns: any[],\r\n  expectedWidth: number,\r\n  startIdx: number,\r\n  allowBleed: boolean,\r\n  defaultColWidth: number = 300\r\n) {\r\n  const columnsToResize = allColumns.slice(startIdx + 1, allColumns.length).filter(c => {\r\n    return c.canAutoResize !== false;\r\n  });\r\n\r\n  for (const column of columnsToResize) {\r\n    if (!column.$$oldWidth) {\r\n      column.$$oldWidth = column.width;\r\n    }\r\n  }\r\n\r\n  let additionWidthPerColumn = 0;\r\n  let exceedsWindow = false;\r\n  let contentWidth = getContentWidth(allColumns, defaultColWidth);\r\n  let remainingWidth = expectedWidth - contentWidth;\r\n  const columnsProcessed: any[] = [];\r\n  const remainingWidthLimit = 1; // when to stop\r\n\r\n  // This loop takes care of the\r\n  do {\r\n    additionWidthPerColumn = remainingWidth / columnsToResize.length;\r\n    exceedsWindow = contentWidth >= expectedWidth;\r\n\r\n    for (const column of columnsToResize) {\r\n      if (exceedsWindow && allowBleed) {\r\n        column.width = column.$$oldWidth || column.width || defaultColWidth;\r\n      } else {\r\n        const newSize = (column.width || defaultColWidth) + additionWidthPerColumn;\r\n\r\n        if (column.minWidth && newSize < column.minWidth) {\r\n          column.width = column.minWidth;\r\n          columnsProcessed.push(column);\r\n        } else if (column.maxWidth && newSize > column.maxWidth) {\r\n          column.width = column.maxWidth;\r\n          columnsProcessed.push(column);\r\n        } else {\r\n          column.width = newSize;\r\n        }\r\n      }\r\n\r\n      column.width = Math.max(0, column.width);\r\n    }\r\n\r\n    contentWidth = getContentWidth(allColumns);\r\n    remainingWidth = expectedWidth - contentWidth;\r\n    removeProcessedColumns(columnsToResize, columnsProcessed);\r\n  } while (remainingWidth > remainingWidthLimit && columnsToResize.length !== 0);\r\n}\r\n\r\n/**\r\n * Remove the processed columns from the current active columns.\r\n */\r\nfunction removeProcessedColumns(columnsToResize: any[], columnsProcessed: any[]) {\r\n  for (const column of columnsProcessed) {\r\n    const index = columnsToResize.indexOf(column);\r\n    columnsToResize.splice(index, 1);\r\n  }\r\n}\r\n\r\n/**\r\n * Gets the width of the columns\r\n */\r\nfunction getContentWidth(allColumns: any, defaultColWidth: number = 300): number {\r\n  let contentWidth = 0;\r\n\r\n  for (const column of allColumns) {\r\n    contentWidth += column.width || defaultColWidth;\r\n  }\r\n\r\n  return contentWidth;\r\n}\r\n"]}