X-Git-Url: http://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=src%2Ftim%2Fprune%2Fgui%2FDecimalNumberField.java;fp=src%2Ftim%2Fprune%2Fgui%2FDecimalNumberField.java;h=39c55d4ecaf0d4b29be10647adfe604f83acbc3b;hp=0000000000000000000000000000000000000000;hb=ce6f2161b8596f7018d6a76bff79bc9e571f35fd;hpb=2d8cb72e84d5cc1089ce77baf1e34ea3ea2f8465

diff --git a/src/tim/prune/gui/DecimalNumberField.java b/src/tim/prune/gui/DecimalNumberField.java
new file mode 100644
index 0000000..39c55d4
--- /dev/null
+++ b/src/tim/prune/gui/DecimalNumberField.java
@@ -0,0 +1,110 @@
+package tim.prune.gui;
+
+import java.awt.Dimension;
+
+import javax.swing.JTextField;
+import javax.swing.text.AttributeSet;
+import javax.swing.text.BadLocationException;
+import javax.swing.text.PlainDocument;
+
+/**
+ * text field for holding a decimal number with validation
+ * - doesn't allow certain characters such as a-z to be entered
+ */
+public class DecimalNumberField extends JTextField
+{
+	/**
+	 * Inner class to act as document for validation
+	 */
+	protected static class DecimalNumberDocument extends PlainDocument
+	{
+		private boolean _allowNegative = false;
+
+		/** constructor */
+		DecimalNumberDocument(boolean inAllowNegative) {
+			_allowNegative = inAllowNegative;
+		}
+
+		/**
+		 * 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
+		{
+			char[] source = str.toCharArray();
+			char[] result = new char[source.length];
+			int j = 0;
+			for (int i = 0; i < result.length; i++) {
+				if (!Character.isLetter(source[i]) && (_allowNegative || source[i] != '-') && source[i] != ' ') // no letters, no minus sign or space
+					result[j++] = source[i];
+			}
+			super.insertString(offs, new String(result, 0, j), a);
+		}
+	}
+
+
+	/**
+	 * Constructor
+	 */
+	public DecimalNumberField()
+	{
+		this(false);
+	}
+
+	/**
+	 * Constructor
+	 * @param inAllowNegative true to allow negative numbers
+	 */
+	public DecimalNumberField(boolean inAllowNegative)
+	{
+		super(6);
+		setDocument(new DecimalNumberDocument(inAllowNegative));
+	}
+
+	/**
+	 * @return double value
+	 */
+	public double getValue()
+	{
+		return parseValue(getText());
+	}
+
+	/**
+	 * @param inValue value to set
+	 */
+	public void setValue(double inValue)
+	{
+		setText("" + inValue);
+	}
+
+	/**
+	 * @param inText text to parse
+	 * @return value as double
+	 */
+	private static double parseValue(String inText)
+	{
+		double value = 0.0;
+		try {
+			value = Double.parseDouble(inText);
+		}
+		catch (NumberFormatException nfe) {}
+		if (value < 0) {
+			value = 0;
+		}
+		return value;
+	}
+
+	/**
+	 * Put a minimum on the minimum width
+	 */
+	public Dimension getMinimumSize()
+	{
+		Dimension dim = super.getMinimumSize();
+		if (dim.width < 50) dim.width = 50;
+		return dim;
+	}
+}