devextreme
Version:
JavaScript/TypeScript Component Suite for Responsive Web Development
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JavaScript
/**
* DevExtreme (esm/__internal/exporter/jspdf/common/rows_splitting.js)
* Version: 25.2.7
* Build date: Tue May 05 2026
*
* Copyright (c) 2012 - 2026 Developer Express Inc. ALL RIGHTS RESERVED
* Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
*/
import {
isDefined
} from "../../../../core/utils/type";
import {
roundToThreeDecimals
} from "./draw_utils";
import {
getPageHeight,
getPageWidth
} from "./pdf_utils";
import {
createOnSplitMultiPageRow
} from "./rows_spliting_utils/create_on_split_multipage_row";
import {
checkPageContainsOnlyHeader,
getMultiPageRowPages
} from "./rows_spliting_utils/get_multipage_row_pages";
const COORDINATE_EPSILON = .001;
function convertToCellsArray(rows) {
return [].concat.apply([], rows.map(rowInfo => rowInfo.cells.filter(cell => !isDefined(cell.pdfCell.isMerged)).map(cellInfo => Object.assign({}, cellInfo.pdfCell._rect, {
sourceCellInfo: Object.assign({}, cellInfo.pdfCell, {
gridCell: cellInfo.gridCell
})
}))))
}
function splitByPages(doc, rowsInfo, options, onSeparateRectHorizontally, onSeparateRectVertically) {
if (0 === rowsInfo.length) {
return [
[]
]
}
const maxBottomRight = {
x: getPageWidth(doc) - options.margin.right,
y: getPageHeight(doc) - options.margin.bottom
};
const headerRows = rowsInfo.filter(r => "header" === r.rowType);
const headerHeight = headerRows.reduce((accumulator, row) => accumulator + row.height, 0);
const verticallyPages = splitRectsByPages(convertToCellsArray(rowsInfo), options.margin.top, "y", "h", (isFirstPage, currentCoordinate) => {
const additionalHeight = !isFirstPage && options.repeatHeaders ? headerHeight : 0;
return roundToThreeDecimals(currentCoordinate + additionalHeight) <= roundToThreeDecimals(maxBottomRight.y)
}, (rect, currentPageMaxRectCoordinate, currentPageRects, rectsToSplit) => {
const args = {
sourceRect: rect,
topRect: {
x: rect.x,
y: rect.y,
w: rect.w,
h: currentPageMaxRectCoordinate - rect.y
},
bottomRect: {
x: rect.x,
y: currentPageMaxRectCoordinate,
w: rect.w,
h: rect.h - (currentPageMaxRectCoordinate - rect.y)
}
};
onSeparateRectVertically(args);
currentPageRects.push(args.topRect);
rectsToSplit.push(args.bottomRect)
}, createOnSplitMultiPageRow(doc, options, headerHeight, maxBottomRight));
if (options.repeatHeaders) {
for (let i = 1; i < verticallyPages.length; i++) {
verticallyPages[i].forEach(rect => rect.y += headerHeight);
const headerCells = convertToCellsArray(headerRows);
headerCells.forEach(cell => {
cell.y -= options.topLeft.y
});
verticallyPages[i] = [...headerCells, ...verticallyPages[i]]
}
}
let pageIndex = 0;
while (pageIndex < verticallyPages.length) {
const horizontallyPages = splitRectsByPages(verticallyPages[pageIndex], options.margin.left, "x", "w", (pagesLength, currentCoordinate) => roundToThreeDecimals(currentCoordinate) <= roundToThreeDecimals(maxBottomRight.x), (rect, currentPageMaxRectCoordinate, currentPageRects, rectsToSplit) => {
const args = {
sourceRect: rect,
leftRect: {
x: rect.x,
y: rect.y,
w: currentPageMaxRectCoordinate - rect.x,
h: rect.h
},
rightRect: {
x: currentPageMaxRectCoordinate,
y: rect.y,
w: rect.w - (currentPageMaxRectCoordinate - rect.x),
h: rect.h
}
};
onSeparateRectHorizontally(args);
currentPageRects.push(args.leftRect);
rectsToSplit.push(args.rightRect)
});
if (horizontallyPages.length > 1) {
verticallyPages.splice(pageIndex, 1, ...horizontallyPages);
pageIndex += horizontallyPages.length
} else {
pageIndex += 1
}
}
return verticallyPages.map(rects => rects.map(rect => Object.assign({}, rect.sourceCellInfo, {
_rect: rect
})))
}
function splitRectsByPages(rects, marginValue, coordinate, dimension, isFitToPage, onSeparateCallback, onSplitMultiPageRow) {
const pages = [];
const rectsToSplit = [...rects];
const isFitToPageForMultiPageRow = (isFirstPage, rectHeight) => isFitToPage(isFirstPage, rectHeight + marginValue);
while (rectsToSplit.length > 0) {
let currentPageMaxRectCoordinate = 0;
const currentPageRects = rectsToSplit.filter(rect => {
const currentRectCoordinate = rect[coordinate] + rect[dimension];
if (isFitToPage(0 === pages.length, currentRectCoordinate)) {
if (currentPageMaxRectCoordinate <= currentRectCoordinate) {
currentPageMaxRectCoordinate = currentRectCoordinate
}
return true
}
return false
});
const isCurrentPageContainsOnlyHeader = checkPageContainsOnlyHeader(currentPageRects, 0 === pages.length);
const multiPageRowPages = getMultiPageRowPages(currentPageRects, rectsToSplit, isCurrentPageContainsOnlyHeader, onSplitMultiPageRow, isFitToPageForMultiPageRow);
const rectsToSeparate = rectsToSplit.filter(rect => {
const currentRectLeft = rect[coordinate];
const currentRectRight = rect[coordinate] + rect[dimension];
return currentPageMaxRectCoordinate - currentRectLeft > .001 && currentRectRight - currentPageMaxRectCoordinate > .001
});
rectsToSeparate.forEach(rect => {
onSeparateCallback(rect, currentPageMaxRectCoordinate, currentPageRects, rectsToSplit);
const index = rectsToSplit.indexOf(rect);
if (-1 !== index) {
rectsToSplit.splice(index, 1)
}
});
currentPageRects.forEach(rect => {
const index = rectsToSplit.indexOf(rect);
if (-1 !== index) {
rectsToSplit.splice(index, 1)
}
});
rectsToSplit.forEach(rect => {
rect[coordinate] = isDefined(currentPageMaxRectCoordinate) ? rect[coordinate] - currentPageMaxRectCoordinate + marginValue : rect[coordinate]
});
const firstPageContainsHeaderAndMultiPageRow = isCurrentPageContainsOnlyHeader && multiPageRowPages.length > 0;
if (firstPageContainsHeaderAndMultiPageRow) {
const [firstPage, ...restOfPages] = multiPageRowPages;
pages.push([...currentPageRects, ...firstPage]);
pages.push(...restOfPages)
} else if (currentPageRects.length > 0) {
pages.push(currentPageRects);
pages.push(...multiPageRowPages)
} else if (multiPageRowPages.length > 0) {
pages.push(...multiPageRowPages);
pages.push(rectsToSplit)
} else {
pages.push(rectsToSplit);
break
}
}
return pages
}
export {
splitByPages
};