如何使用 ReportLab 在 PDF 模板文件的框中添加具有动态高度的表格

Question

我想在 PDF 模板文件的方框内绘制表格。由于盒子的高度是固定的，如果表格的行数超过特定数量（例如4），表格就会从盒子中溢出。 有没有办法在使用reportlab包绘制表格时动态指定表格的高度？

def add_table(self, data: list[list[str]]):
        
        t = Table(data)
        
        t.setStyle(TableStyle([
            ("FACE", (0, 0), (-1, -1), "Times-Roman"),
            ('ALIGN', (0, 0), (-1, -1), 'CENTER'),
            ("VALIGN", (0, 0), (-1, -1), "BOTTOM"),
            ('FONTSIZE', (0,0), (-1,-1), 4),
            ('INNERGRID',(0,0),(-1,-1), 1, colors.lightgrey),
            ('OUTLINE', (0, 0), (-1, -1), 1, colors.lightgrey),
            ("LEFTPADDING", (0, 0), (-1, -1), 0),
            ("RIGHTPADDING", (0, 0), (-1, -1), 5),
            ("BOTTOMPADDING", (0, 0), (-1, -1), 0),
            ("TOPPADDING", (0, 0), (-1, -1), 0),
            ])
        )
    
        t.wrap(0, 0)
        t.drawOn(self.c, 72, 200)
        self.c.save()

Answer 1

我使用这段代码来解决我的问题。

COL_WIDTHS = [40, 50, 30, 40, 45, 40, 45, 40, 40, 40, 40, 45, 45, 40, 40, 40, 40]

TABLE_STYLE = [
        ('GRID', (0, 0), (-1, -1), 0.5, colors.lightgrey),
        ('ALIGN', (0, 0), (-1, -1), 'LEFT'),
        ("HALIGN", (0, 0), (-1, -1), "MIDDLE"),
        ("VALIGN", (0, 0), (-1, -1), "MIDDLE"),
        ('LEFTPADDING', (0, 0), (-1, -1), 0.5),
        ('RIGHTPADDING', (0, 0), (-1, -1), 0),
        ('TOPPADDING', (0, 0), (-1, -1), 0),
        ('BOTTOMPADDING', (0, 0), (-1, -1), 0),
        ('FONTNAME', (0, 0), (-1, 0), 'Times-Roman-Bold'),
        ('LEADING', (0, 0), (-1, -1), 8.2),
    ]
        
def get_styled_table(self, data: list[list[str]]) -> Table:
                
    # My table has 17 columns and variable number of rows
    t = Table(data, colWidths=COL_WIDTHS, rowHeights=[20] * len(data))
                
    t.setStyle(TableStyle(TABLE_STYLE))
        
    row_heights = 20
    while True:
        # Break loop if height of table is smaller than box size (e.g. 160)
        if t.wrapOn(self.c, 730, 160)[1] < 160:
           break
        
        # Decrease rows height if height of table is bigger than box size
        row_heights -= 0.5
        
        # Define table with new row heights 
        t = Table(data, colWidths=COL_WIDTHS, rowHeights=[row_heights] * len(data))
        
        # Set font size to accommodate cells content inside them
        t.setStyle(TableStyle(TABLE_STYLE + [('FONTSIZE', (0,0), (-1,-1), 0.5 * row_heights)]))
            
    return t
        
def add_table(self, data: list[list[str]]):
        
        t = self.get_styled_table(data)
        
        t.wrapOn(self.c, 730, 160)
        t.drawOn(self.c, 43, 408)