X-Git-Url: https://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=src%2Ftim%2Fprune%2Fgui%2FWholeNumberField.java;fp=src%2Ftim%2Fprune%2Fgui%2FWholeNumberField.java;h=b12d299b626c960101a8aed1f917d4ead1da918e;hp=0000000000000000000000000000000000000000;hb=ce6f2161b8596f7018d6a76bff79bc9e571f35fd;hpb=2d8cb72e84d5cc1089ce77baf1e34ea3ea2f8465

diff --git a/src/tim/prune/gui/WholeNumberField.java b/src/tim/prune/gui/WholeNumberField.java
new file mode 100644
index 0000000..b12d299
--- /dev/null
+++ b/src/tim/prune/gui/WholeNumberField.java
@@ -0,0 +1,103 @@
+package tim.prune.gui;
+
+import javax.swing.JTextField;
+import javax.swing.event.DocumentEvent;
+import javax.swing.event.DocumentListener;
+import javax.swing.text.AttributeSet;
+import javax.swing.text.BadLocationException;
+import javax.swing.text.PlainDocument;
+
+/**
+ * text field for holding a single integer with validation
+ */
+public class WholeNumberField extends JTextField
+{
+	/**
+	 * Inner class to act as document for validation
+	 */
+	protected static class WholeNumberDocument extends PlainDocument
+	{
+		/** Num digits to allow */
+		private int _maxDigits = 0;
+
+		/**
+		 * Constructor
+		 * @param inMaxDigits max digits to allow
+		 */
+		public WholeNumberDocument(int inMaxDigits)
+		{
+			_maxDigits = inMaxDigits;
+		}
+
+
+		/**
+		 * Override the insert string method
+		 * @param offs offset
+		 * @param str string
+		 * @param a attributes
+		 * @throws BadLocationException on insert failure
+		 */
+		public void insertString(int offs, String str, AttributeSet a)
+			throws BadLocationException
+		{
+			if (getLength() >= _maxDigits) return;
+			char[] source = str.toCharArray();
+			char[] result = new char[source.length];
+			int j = 0;
+			for (int i = 0; i < result.length && j < _maxDigits; i++) {
+				if (Character.isDigit(source[i]))
+					result[j++] = source[i];
+			}
+			super.insertString(offs, new String(result, 0, j), a);
+		}
+	}
+
+
+	/**
+	 * Constructor
+	 * @param inMaxDigits max digits to allow
+	 */
+	public WholeNumberField(int inMaxDigits)
+	{
+		super(inMaxDigits);
+		setDocument(new WholeNumberDocument(inMaxDigits));
+		getDocument().addDocumentListener(new DocumentListener() {
+			public void removeUpdate(DocumentEvent arg0) {fireActionPerformed();}
+			public void insertUpdate(DocumentEvent arg0) {fireActionPerformed();}
+			public void changedUpdate(DocumentEvent arg0) {fireActionPerformed();}
+		});
+	}
+
+	/**
+	 * @return integer value
+	 */
+	public int getValue()
+	{
+		return parseValue(getText());
+	}
+
+	/**
+	 * @param inValue value to set
+	 */
+	public void setValue(int inValue)
+	{
+		setText("" + inValue);
+	}
+
+	/**
+	 * @param inText text to parse
+	 * @return value as integer
+	 */
+	private static int parseValue(String inText)
+	{
+		int value = 0;
+		try {
+			value = Integer.parseInt(inText);
+		}
+		catch (NumberFormatException nfe) {}
+		if (value < 0) {
+			value = 0;
+		}
+		return value;
+	}
+}