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support for auto-sizing worksheet columns

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git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@507076 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Yegor Kozlov 2007-02-13 16:25:55 +00:00
parent d49f3d91a3
commit 5d19ceee38
2 changed files with 131 additions and 22 deletions
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10
src/documentation/content/xdocs/hssf/quick-guide.xml
View File

@ -65,6 +65,7 @@
<li><link href="#Images">Images</link></li>
<li><link href="#NamedRanges">Named Ranges and Named Cells</link></li>
<li><link href="#CellComments">How to set cell comments</link></li>
<li><link href="#Autofit">How to adjust column width to fit the contents</link></li>
</ul>
</section>
<section><title>Features</title>
@ -1131,6 +1132,15 @@
}
</source>
</section>
<anchor id="Autofit"/>
<section><title>Adjust column width to fit the contents</title>
<source>
HSSFSheet sheet = workbook.getSheetAt(0);
sheet.autoSizeColumn((short)0); //adjust width of the first column
sheet.autoSizeColumn((short)1); //adjust width of the second column
</source>
</section>
</body>
</document>

99
src/java/org/apache/poi/hssf/usermodel/HSSFSheet.java
View File

@ -36,6 +36,12 @@ import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.TreeMap;
import java.text.AttributedString;
import java.text.NumberFormat;
import java.text.DecimalFormat;
import java.awt.font.TextLayout;
import java.awt.font.FontRenderContext;
import java.awt.font.TextAttribute;
/**
* High level representation of a worksheet.
@ -44,6 +50,7 @@ import java.util.TreeMap;
* @author Libin Roman (romal at vistaportal.com)
* @author Shawn Laubach (slaubach at apache dot org) (Just a little)
* @author Jean-Pierre Paris (jean-pierre.paris at m4x dot org) (Just a little, too)
* @author Yegor Kozlov (yegor at apache.org) (Autosizing columns)
*/
public class HSSFSheet
@ -1381,4 +1388,96 @@ public class HSSFSheet
public void setDefaultColumnStyle(short column, HSSFCellStyle style) {
sheet.setColumn(column, new Short(style.getIndex()), null, null, null, null);
}
/**
* Adjusts the column width to fit the contents.
*
* @param column the column index
*/
public void autoSizeColumn(short column) {
AttributedString str;
TextLayout layout;
/**
* Excel measures columns in units of 1/256th of a character width
* but the docs say nothing about what particular character is used.
* '0' looks a good choice.
*/
char defaultChar = '0';
FontRenderContext frc = new FontRenderContext(null, true, true);
HSSFWorkbook wb = new HSSFWorkbook(book);
HSSFFont defaultFont = wb.getFontAt((short) 0);
str = new AttributedString("" + defaultChar);
str.addAttribute(TextAttribute.FAMILY, defaultFont.getFontName());
str.addAttribute(TextAttribute.SIZE, new Float(defaultFont.getFontHeightInPoints()));
layout = new TextLayout(str.getIterator(), frc);
int defaultCharWidth = (int)layout.getAdvance();
double width = -1;
for (Iterator it = rowIterator(); it.hasNext();) {
HSSFRow row = (HSSFRow) it.next();
HSSFCell cell = row.getCell(column);
if (cell == null) continue;
HSSFCellStyle style = cell.getCellStyle();
HSSFFont font = wb.getFontAt(style.getFontIndex());
if (cell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
HSSFRichTextString rt = cell.getRichStringCellValue();
String[] lines = rt.getString().split("\\n");
for (int i = 0; i < lines.length; i++) {
str = new AttributedString(lines[i] + defaultChar);
str.addAttribute(TextAttribute.FAMILY, font.getFontName());
str.addAttribute(TextAttribute.SIZE, new Float(font.getFontHeightInPoints()));
if (font.getBoldweight() == HSSFFont.BOLDWEIGHT_BOLD) str.addAttribute(TextAttribute.WEIGHT, TextAttribute.WEIGHT_BOLD);
if (rt.numFormattingRuns() > 0) {
for (int j = 0; j < lines[i].length(); j++) {
int idx = rt.getFontAtIndex(j);
if (idx != 0) {
HSSFFont fnt = wb.getFontAt((short) idx);
str.addAttribute(TextAttribute.FAMILY, fnt.getFontName(), j, j + 1);
str.addAttribute(TextAttribute.SIZE, new Float(fnt.getFontHeightInPoints()), j, j + 1);
}
}
}
layout = new TextLayout(str.getIterator(), frc);
width = Math.max(width, layout.getAdvance() / defaultCharWidth);
}
} else {
String sval = null;
if (cell.getCellType() == HSSFCell.CELL_TYPE_NUMERIC) {
HSSFDataFormat dataformat = wb.createDataFormat();
short idx = style.getDataFormat();
String format = dataformat.getFormat(idx).replaceAll("\"", "");
double value = cell.getNumericCellValue();
try {
NumberFormat fmt;
if ("General".equals(format))
fmt = new DecimalFormat();
else
fmt = new DecimalFormat(format);
sval = fmt.format(value);
} catch (Exception e) {
sval = "" + value;
}
} else if (cell.getCellType() == HSSFCell.CELL_TYPE_FORMULA) {
sval = cell.getCellFormula();
} else if (cell.getCellType() == HSSFCell.CELL_TYPE_BOOLEAN) {
sval = String.valueOf(cell.getBooleanCellValue());
}
str = new AttributedString(sval + defaultChar);
str.addAttribute(TextAttribute.FAMILY, font.getFontName());
str.addAttribute(TextAttribute.SIZE, new Float(font.getFontHeightInPoints()));
layout = new TextLayout(str.getIterator(), frc);
width = Math.max(width, layout.getAdvance() / defaultCharWidth);
}
if (width != -1) {
sheet.setColumnWidth(column, (short) (width * 256));
}
}
}
}