从 PdfPTable 列获取绝对宽度 (iText)
Get absolute width from PdfPTable column (iText)
当 table 列指定为 [=38] 时，如何从 iText 中获取列的 绝对宽度 =]相对大小 ?
我试过的
我将 3 列的 相对宽度 指定为浮点数，如下所示：
PdfPCell cell2;
PdfPTable table2 = new PdfPTable(new float[]{(float) 4.5, (float) 0.5, 9});
table2.setWidthPercentage(100);
我得到了什么
我尝试使用 table2.getAbsoluteWidths()[2] 但结果是浮点数 0.0.
如我所料
在 PDF 上动态计算 table 宽度后，我想获得每一列的 绝对宽度（已最大化）。
------------------------编辑-------------------- -
实际上我需要在 添加文档之前的列宽 然后替换我的硬编码浮点变量 restriction.
我有很多数据字符串，想在通过函数拆分获得最大宽度页面时在另一列中设置 restrictWidthOfFont
String fullAlamatPP = "test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test ";
float restrictions = (float) 330.12103; // this is width of a column from table
String alamatSesuaiKtpPP[] = restrictWidthOfFont(fullAlamatPP, font_body, restrictions);
Phrase p_alamat1_ct = new Phrase(alamatSesuaiKtpPP[0], font_body);
p_alamat1_ct.add(dottedline);
cell2 = new PdfPCell(p_alamat1_ct);
cell2.setBorder(PdfPCell.NO_BORDER);
table2.addCell(cell2);
Phrase p_alamat2_ct = new Phrase(alamatSesuaiKtpPP[1], font_body);
p_alamat2_ct.add(dottedline);
cell2 = new PdfPCell(p_alamat2_ct);
cell2.setBorder(PdfPCell.NO_BORDER);
table2.addCell(cell2);
private static String[] restrictWidthOfFont(String character, Font font, float restrictions) {
String results[];
results = new String[] {"",""};
String concatChar = " ";
float widthOfString = 0;
for (int i = 0; i < character.length();i++) {
concatChar += character.charAt(i);
widthOfString = font.getCalculatedBaseFont(true).getWidthPoint(concatChar, font.getCalculatedSize());
// System.out.println("widthOfString " + widthOfString);
if (widthOfString > restrictions) {
results[0] = concatChar.substring(0, concatChar.length() - 1);
results[1] = character.substring(i, character.length());
break;
}
}
if (results[0] == "") {
results[0] = character;
}
return results;
}
在添加 table 文档之前可以获取列宽吗？
问题与解释
函数table.getAbsoluteWidths()依赖于必须设置table的totalWidth的要求，因此table.getTotalWidth() > 0.
这是因为在 com.itextpdf.text.pdf.PdfPTable class 中调用了一个方法 calculateWidths()，然后计算所有列的绝对宽度：
this.absoluteWidths[k] = this.totalWidth * this.relativeWidths[k] / total;
解决方案
为了确保 totalWidth 是 set before 你检索 relativeWidths数组，你需要：
- (A) 设置 totalWidth，如 this answer
中所述
- 或 (B) 将单元格添加到 table 并将 table 添加到文档
解决方案代码
以下代码将您的算法合并到拆分文本（即长地址或alamat）跨单元格基于最大列宽:
的限制
import com.itextpdf.text.*;
import com.itextpdf.text.pdf.*;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Arrays;
public class TableWidthSample {
public static void main(String[] args) {
Document document = new Document();
try {
PdfWriter.getInstance(document, new FileOutputStream("TableColumnWidth.pdf"));
document.open();
PdfPTable table = createTableWithRelativeColumnWidths();
// needed for calculation of getAbsoluteWidths: (A) totalWidth is set for table
table.setTotalWidth(calculateTableWidthBasedOnPageA4(document, table));
// now it prints width, because (A)
printTableWidth(table, "after totalWidth set manually"); // absoluteWidths: [134.4857, 14.942857, 268.9714]
// long text, that needs to be split among cells (fullAlamatPP)
String text = "this is a very long text. The text contains a full address. Because the text is too long to be shown in the last cell, it is split.";
// your CODE to fill text into cells based on restrictions
addTextAcrossTableCells(table, text);
document.add(table);
/*
// need to add filled table to doc (B)
addToDocumentCellsAndTable(document, table);
// now it prints width, because (B)
printTableWidth(table, "after added to doc"); // absoluteWidths: [134.4857, 14.942857, 268.9714]
*/
document.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (DocumentException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
private static PdfPTable createTableWithRelativeColumnWidths() {
float[] relativeWidths = {4.5F, 0.5F, 9F};
PdfPTable table = new PdfPTable(relativeWidths);
table.setWidthPercentage(100F);
printTableWidth(table, "after table created"); // absoluteWidths: [0.0, 0.0, 0.0]
return table;
}
private static float calculateTableWidthBasedOnPageA4(Document document, PdfPTable table) {
return (PageSize.A4.getWidth() - document.leftMargin() - document.rightMargin())
* table.getWidthPercentage() / 100;
}
private static void addToDocumentCellsAndTable(Document document, PdfPTable table) throws DocumentException {
// needed for calculation of getAbsoluteWidths: (B.1) add cells to table
table.addCell("Hello");
table.addCell("World");
table.addCell("!");
printTableWidth(table, "after cells added to table"); // absoluteWidths: [0.0, 0.0, 0.0]
// needed for calculation of getAbsoluteWidths: (B.2) add table to doc
document.add(table);
}
private static void addTextAcrossTableCells(PdfPTable table, String text) throws IOException, DocumentException {
// restrictions; this is width of a column from table
float maxColumnWidth = table.getAbsoluteWidths()[2]; // 330.12103F;
System.out.println("use width of third column as max: " + maxColumnWidth);
// sample font used for calculation of text-width
Font font = new Font(BaseFont.createFont("Courier", BaseFont.CP1250, true), 12);
// alamatSesuaiKtpPP
String splitText[] = getTextPartsUsingFontWithMaxWidth(text, font, maxColumnWidth);
String dottedLine = "..";
table.addCell("Alamat / Address:");
// p_alamat1_ct
Phrase phrase1 = new Phrase(splitText[0], font);
phrase1.add(dottedLine);
PdfPCell cell1 = new PdfPCell(phrase1);
cell1.setBackgroundColor(BaseColor.LIGHT_GRAY);
cell1.setBorder(PdfPCell.NO_BORDER);
table.addCell(cell1);
// p_alamat2_ct
Phrase phrase2 = new Phrase(splitText[1], font);
phrase2.add(dottedLine);
PdfPCell cell2 = new PdfPCell(phrase2);
cell2.setBorder(PdfPCell.NO_BORDER);
table.addCell(cell2);
}
private static String[] getTextPartsUsingFontWithMaxWidth(String text, Font font, float maxWidth) {
String results[] = new String[] {"",""};
String firstPartOfText = " ";
float widthOfText = 0;
for (int i = 0; i < text.length();i++) {
firstPartOfText += text.charAt(i);
widthOfText = font.getCalculatedBaseFont(true).getWidthPoint(firstPartOfText, font.getCalculatedSize());
System.out.printf("%d: widthOfText: %f\n", i, widthOfText);
if (widthOfText > maxWidth) {
results[0] = firstPartOfText.substring(0, firstPartOfText.length() - 1);
results[1] = text.substring(i); // second argument "text.length()" is not needed
break;
}
}
if (results[0] == "") {
results[0] = text;
}
return results;
}
private static void printTableWidth(PdfPTable table, String labelText) {
float[] absoluteWidths = table.getAbsoluteWidths();
System.out.println(labelText + "> getAbsoluteWidths: " + Arrays.toString(absoluteWidths));
}
}
另见
How to make PdfPTable calculate column-width dynamically
当 table 列指定为 [=38] 时，如何从 iText 中获取列的 绝对宽度 =]相对大小 ?
我试过的
我将 3 列的 相对宽度 指定为浮点数，如下所示：
PdfPCell cell2;
PdfPTable table2 = new PdfPTable(new float[]{(float) 4.5, (float) 0.5, 9});
table2.setWidthPercentage(100);
我得到了什么
我尝试使用 table2.getAbsoluteWidths()[2] 但结果是浮点数 0.0.
如我所料
在 PDF 上动态计算 table 宽度后，我想获得每一列的 绝对宽度（已最大化）。
------------------------编辑-------------------- -
实际上我需要在 添加文档之前的列宽 然后替换我的硬编码浮点变量 restriction.
我有很多数据字符串，想在通过函数拆分获得最大宽度页面时在另一列中设置 restrictWidthOfFont
String fullAlamatPP = "test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test test ";
float restrictions = (float) 330.12103; // this is width of a column from table
String alamatSesuaiKtpPP[] = restrictWidthOfFont(fullAlamatPP, font_body, restrictions);
Phrase p_alamat1_ct = new Phrase(alamatSesuaiKtpPP[0], font_body);
p_alamat1_ct.add(dottedline);
cell2 = new PdfPCell(p_alamat1_ct);
cell2.setBorder(PdfPCell.NO_BORDER);
table2.addCell(cell2);
Phrase p_alamat2_ct = new Phrase(alamatSesuaiKtpPP[1], font_body);
p_alamat2_ct.add(dottedline);
cell2 = new PdfPCell(p_alamat2_ct);
cell2.setBorder(PdfPCell.NO_BORDER);
table2.addCell(cell2);
private static String[] restrictWidthOfFont(String character, Font font, float restrictions) {
String results[];
results = new String[] {"",""};
String concatChar = " ";
float widthOfString = 0;
for (int i = 0; i < character.length();i++) {
concatChar += character.charAt(i);
widthOfString = font.getCalculatedBaseFont(true).getWidthPoint(concatChar, font.getCalculatedSize());
// System.out.println("widthOfString " + widthOfString);
if (widthOfString > restrictions) {
results[0] = concatChar.substring(0, concatChar.length() - 1);
results[1] = character.substring(i, character.length());
break;
}
}
if (results[0] == "") {
results[0] = character;
}
return results;
}
在添加 table 文档之前可以获取列宽吗？
问题与解释
函数table.getAbsoluteWidths()依赖于必须设置table的totalWidth的要求，因此table.getTotalWidth() > 0.
这是因为在 com.itextpdf.text.pdf.PdfPTable class 中调用了一个方法 calculateWidths()，然后计算所有列的绝对宽度：
this.absoluteWidths[k] = this.totalWidth * this.relativeWidths[k] / total;
解决方案
为了确保 totalWidth 是 set before 你检索 relativeWidths数组，你需要：
- (A) 设置 totalWidth，如 this answer 中所述
- 或 (B) 将单元格添加到 table 并将 table 添加到文档
解决方案代码
以下代码将您的算法合并到拆分文本（即长地址或alamat）跨单元格基于最大列宽:
的限制import com.itextpdf.text.*;
import com.itextpdf.text.pdf.*;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Arrays;
public class TableWidthSample {
public static void main(String[] args) {
Document document = new Document();
try {
PdfWriter.getInstance(document, new FileOutputStream("TableColumnWidth.pdf"));
document.open();
PdfPTable table = createTableWithRelativeColumnWidths();
// needed for calculation of getAbsoluteWidths: (A) totalWidth is set for table
table.setTotalWidth(calculateTableWidthBasedOnPageA4(document, table));
// now it prints width, because (A)
printTableWidth(table, "after totalWidth set manually"); // absoluteWidths: [134.4857, 14.942857, 268.9714]
// long text, that needs to be split among cells (fullAlamatPP)
String text = "this is a very long text. The text contains a full address. Because the text is too long to be shown in the last cell, it is split.";
// your CODE to fill text into cells based on restrictions
addTextAcrossTableCells(table, text);
document.add(table);
/*
// need to add filled table to doc (B)
addToDocumentCellsAndTable(document, table);
// now it prints width, because (B)
printTableWidth(table, "after added to doc"); // absoluteWidths: [134.4857, 14.942857, 268.9714]
*/
document.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (DocumentException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
private static PdfPTable createTableWithRelativeColumnWidths() {
float[] relativeWidths = {4.5F, 0.5F, 9F};
PdfPTable table = new PdfPTable(relativeWidths);
table.setWidthPercentage(100F);
printTableWidth(table, "after table created"); // absoluteWidths: [0.0, 0.0, 0.0]
return table;
}
private static float calculateTableWidthBasedOnPageA4(Document document, PdfPTable table) {
return (PageSize.A4.getWidth() - document.leftMargin() - document.rightMargin())
* table.getWidthPercentage() / 100;
}
private static void addToDocumentCellsAndTable(Document document, PdfPTable table) throws DocumentException {
// needed for calculation of getAbsoluteWidths: (B.1) add cells to table
table.addCell("Hello");
table.addCell("World");
table.addCell("!");
printTableWidth(table, "after cells added to table"); // absoluteWidths: [0.0, 0.0, 0.0]
// needed for calculation of getAbsoluteWidths: (B.2) add table to doc
document.add(table);
}
private static void addTextAcrossTableCells(PdfPTable table, String text) throws IOException, DocumentException {
// restrictions; this is width of a column from table
float maxColumnWidth = table.getAbsoluteWidths()[2]; // 330.12103F;
System.out.println("use width of third column as max: " + maxColumnWidth);
// sample font used for calculation of text-width
Font font = new Font(BaseFont.createFont("Courier", BaseFont.CP1250, true), 12);
// alamatSesuaiKtpPP
String splitText[] = getTextPartsUsingFontWithMaxWidth(text, font, maxColumnWidth);
String dottedLine = "..";
table.addCell("Alamat / Address:");
// p_alamat1_ct
Phrase phrase1 = new Phrase(splitText[0], font);
phrase1.add(dottedLine);
PdfPCell cell1 = new PdfPCell(phrase1);
cell1.setBackgroundColor(BaseColor.LIGHT_GRAY);
cell1.setBorder(PdfPCell.NO_BORDER);
table.addCell(cell1);
// p_alamat2_ct
Phrase phrase2 = new Phrase(splitText[1], font);
phrase2.add(dottedLine);
PdfPCell cell2 = new PdfPCell(phrase2);
cell2.setBorder(PdfPCell.NO_BORDER);
table.addCell(cell2);
}
private static String[] getTextPartsUsingFontWithMaxWidth(String text, Font font, float maxWidth) {
String results[] = new String[] {"",""};
String firstPartOfText = " ";
float widthOfText = 0;
for (int i = 0; i < text.length();i++) {
firstPartOfText += text.charAt(i);
widthOfText = font.getCalculatedBaseFont(true).getWidthPoint(firstPartOfText, font.getCalculatedSize());
System.out.printf("%d: widthOfText: %f\n", i, widthOfText);
if (widthOfText > maxWidth) {
results[0] = firstPartOfText.substring(0, firstPartOfText.length() - 1);
results[1] = text.substring(i); // second argument "text.length()" is not needed
break;
}
}
if (results[0] == "") {
results[0] = text;
}
return results;
}
private static void printTableWidth(PdfPTable table, String labelText) {
float[] absoluteWidths = table.getAbsoluteWidths();
System.out.println(labelText + "> getAbsoluteWidths: " + Arrays.toString(absoluteWidths));
}
}
另见
How to make PdfPTable calculate column-width dynamically