将表格拆分为 PowerPoint 文件中的多张幻灯片答案

【问题标题】：Split table to multiple slides in PowerPoint file将表格拆分为 PowerPoint 文件中的多张幻灯片
【发布时间】：2020-10-07 00:13:48
【问题描述】：

我正在使用GemBox.Presentation，并且正在我的 PPTX 文件中创建一个大表。类似于this example，例如：

PresentationDocument presentation = new PresentationDocument();
Slide slide = presentation.Slides.AddNew(SlideLayoutType.Custom);

int rowCount = 100;

int columnCount = 4;
int columnWidth = 5;

Table table = slide.Content.AddTable(1, 1, columnCount * columnWidth, 0, LengthUnit.Centimeter);

for (int i = 0; i < columnCount; i++)
    table.Columns.AddNew(Length.From(5, LengthUnit.Centimeter));

for (int r = 0; r < rowCount; r++)
{
    TableRow row = table.Rows.AddNew(0);
    for (int c = 0; c < columnCount; c++)
    {
        TableCell cell = row.Cells.AddNew();
        TextParagraph paragraph = cell.Text.AddParagraph();
        TextRun run = paragraph.AddRun(string.Format("Cell {0}-{1}", r + 1, c + 1));
    }
}

presentation.Save("output.pptx");

正如预期的那样，表格不适合幻灯片：

所以我需要将这个表格拆分成多个表格或多个幻灯片，以便每个表格都适合其幻灯片并且所有行都可见。

我该怎么做？
如何判断新的TableRow 是否会超过Slide 的高度？

【问题讨论】：

标签： c# table-splitting gembox-presentation

【解决方案1】：

如果您有动态行高（例如，某些单元格可能包含多行文本），那么您需要对内容进行分页。

例如，请参阅以下内容：

table.Frame.FormatDrawing(new PaginatorOptions() { UpdateTableRowHeights = true });

DrawingLayout tableLayout = table.Frame.Layout;
double maxHeight = presentation.SlideSize.Height - tableLayout.Top;
double currentHeight = 0;

TableRowCollection sourceRows = table.Rows;
TableRowCollection newRows = null;
int currentRowIndex = 0;

// Split the main table into multiple new tables based on the row heights.
while (currentRowIndex < sourceRows.Count)
{
    currentHeight += sourceRows[currentRowIndex].Height;

    // Create new slide with new table.
    if (currentHeight > maxHeight)
    {
        currentHeight = sourceRows[currentRowIndex].Height;

        Slide newSlide = presentation.Slides.AddNew(SlideLayoutType.Blank);
        Table newTable = newSlide.Content.AddTable(tableLayout.Left, tableLayout.Top, tableLayout.Width, 0);

        foreach (var column in table.Columns)
            newTable.Columns.AddClone(column);
        
        newRows = newTable.Rows;
    }

    // Move row from the main table to a new table.
    if (newRows != null)
    {
        newRows.AddClone(sourceRows[currentRowIndex]);
        sourceRows.RemoveAt(currentRowIndex);
    }
    else
    {
        ++currentRowIndex;
    }
}

presentation.Save("output.pptx");

如果您有恒定的行高，如屏幕截图所示，那么您可以简化它。

例如，如下所示：

int rowsPerSlide = 16;

TableRowCollection rows = table.Rows;
DrawingLayout layout = table.Frame.Layout;

for (int t = 1, tablesCount = (int)Math.Ceiling(rows.Count / (double)rowsPerSlide); t < tablesCount; t++)
{
    Slide newSlide = presentation.Slides.AddNew(SlideLayoutType.Blank);
    Table newTable = newSlide.Content.AddTable(layout.Left, layout.Top, layout.Width, 0);

    foreach (var column in table.Columns)
        newTable.Columns.AddClone(column);

    for (int r = rowsPerSlide, rowsCount = Math.Min(rowsPerSlide * 2, rows.Count); r < rowsCount; r++)
    {
        newTable.Rows.AddClone(rows[rowsPerSlide]);
        rows.RemoveAt(rowsPerSlide);
    }
}

presentation.Save("output.pptx");

【讨论】：