X-Git-Url: http://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=tim%2Fprune%2Fgui%2FTripleStateCheckBox.java;fp=tim%2Fprune%2Fgui%2FTripleStateCheckBox.java;h=6bd60019340244d8db20c77886df93dc4882928e;hp=0000000000000000000000000000000000000000;hb=0a2480df5845e2d7190dfdec9b2653b1609e853d;hpb=2154b1969ac2995cca46546f217f53c066b0b749

diff --git a/tim/prune/gui/TripleStateCheckBox.java b/tim/prune/gui/TripleStateCheckBox.java
new file mode 100644
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--- /dev/null
+++ b/tim/prune/gui/TripleStateCheckBox.java
@@ -0,0 +1,78 @@
+package tim.prune.gui;
+
+import java.awt.event.ItemEvent;
+import java.awt.event.ItemListener;
+
+import javax.swing.ImageIcon;
+import javax.swing.JCheckBox;
+
+/**
+ * Class to represent a checkbox with three states, through which it cycles
+ * Instead of calling isChecked, need to use getCurrentState which will
+ * return 0, 1 or 2
+ */
+public class TripleStateCheckBox extends JCheckBox implements ItemListener
+{
+	/** Array of icons to be used */
+	private ImageIcon[] _icons = new ImageIcon[3];
+	/** Current state 0, 1 or 2 */
+	private int _currState = 0;
+
+	/** Inner class to proxy the listening events */
+	private class ProxyListener implements ItemListener
+	{
+		/** Listener onto which some of the events will be passed */
+		private ItemListener _listener = null;
+		/** Constructor */
+		ProxyListener(ItemListener inListener) {_listener = inListener;}
+		/** React to events, and only pass on the selected ones */
+		public void itemStateChanged(ItemEvent arg0) {
+			if (arg0.getStateChange() == ItemEvent.SELECTED) {
+				_listener.itemStateChanged(arg0);
+			}
+		}
+	}
+
+	/** Constructor */
+	public TripleStateCheckBox()
+	{
+		addItemListener(this);
+	}
+
+	/** Set the current state */
+	public void setCurrentState(int inState)
+	{
+		_currState = inState % 3;
+		setIcon(_icons[_currState]);
+		setSelected(false);
+		setSelectedIcon(_icons[(_currState+1)%3]);
+	}
+
+	/** @return current state 0, 1 or 2 */
+	public int getCurrentState()
+	{
+		return _currState;
+	}
+
+	/**
+	 * Set the icon to use for the given index
+	 * @param inIndex index 0, 1 or 2
+	 * @param inIcon icon to use for that state
+	 */
+	public void setIcon(int inIndex, ImageIcon inIcon)
+	{
+		_icons[inIndex % 3] = inIcon;
+	}
+
+	@Override
+	/** Intercept listener adding by putting a proxy inbetween */
+	public void addItemListener(ItemListener inListener) {
+		super.addItemListener(new ProxyListener(inListener));
+	}
+
+	/** React to a selection event by advancing the state */
+	public void itemStateChanged(ItemEvent inEvent)
+	{
+		setCurrentState(_currState + 1);
+	}
+}