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Copy pathIntFilter.java
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53 lines (50 loc) · 1.5 KB
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package textFormat;
import javax.swing.text.*;
/**
* A filter that restricts input to digits and a '-' sign.
*/
public class IntFilter extends DocumentFilter
{
public void insertString(FilterBypass fb, int offset, String string, AttributeSet attr)
throws BadLocationException
{
StringBuilder builder = new StringBuilder(string);
for (int i = builder.length() - 1; i >= 0; i--)
{
int cp = builder.codePointAt(i);
if (!Character.isDigit(cp) && cp != '-')
{
builder.deleteCharAt(i);
if (Character.isSupplementaryCodePoint(cp))
{
i--;
builder.deleteCharAt(i);
}
}
}
super.insertString(fb, offset, builder.toString(), attr);
}
public void replace(FilterBypass fb, int offset, int length, String string, AttributeSet attr)
throws BadLocationException
{
if (string != null)
{
StringBuilder builder = new StringBuilder(string);
for (int i = builder.length() - 1; i >= 0; i--)
{
int cp = builder.codePointAt(i);
if (!Character.isDigit(cp) && cp != '-')
{
builder.deleteCharAt(i);
if (Character.isSupplementaryCodePoint(cp))
{
i--;
builder.deleteCharAt(i);
}
}
}
string = builder.toString();
}
super.replace(fb, offset, length, string, attr);
}
}