Add a simple delegate renderer for JList

Adds a simple delegate renderer for JLists, for cases where you just
want custom text for a list item

1 files changed, 54 insertions, 0 deletions

diff --git a/base/src/main/java/bjc/utils/gui/DelegateListCellRenderer.java b/base/src/main/java/bjc/utils/gui/DelegateListCellRenderer.java
new file mode 100644
index 0000000..d21fa97
--- /dev/null
+++ b/base/src/main/java/bjc/utils/gui/DelegateListCellRenderer.java
@@ -0,0 +1,54 @@
+package bjc.utils.gui;
+
+import java.awt.Component;
+import java.util.function.Function;
+
+import javax.swing.JLabel;
+import javax.swing.JList;
+import javax.swing.ListCellRenderer;
+
+/**
+ * Simple implementation of {@link ListCellRenderer} that uses a custom label.
+ * 
+ * This renderer does the simple task of using a custom 'toString' method to display text for a given data type.
+ * 
+ * @param <E> The data-type being displayed
+ */
+public class DelegateListCellRenderer<E> extends JLabel implements ListCellRenderer<E> {
+	private static final long serialVersionUID = -3312631037740011026L;
+
+	private Function<E, String> toStringer;
+
+	/**
+	 * Create a new renderer using a given toString function
+	 * 
+	 * @param toStringer The toString function to use
+	 */
+	public DelegateListCellRenderer(Function<E, String> toStringer) {
+		super();
+		this.toStringer = toStringer;
+	}
+
+
+	@Override
+	public Component getListCellRendererComponent(JList<? extends E> list, E value, int index, boolean isSelected,
+			boolean cellHasFocus) {
+		String val = toStringer.apply(value);
+		
+		setText(val);
+		
+		if (isSelected) {
+			setBackground(list.getSelectionBackground());
+			setForeground(list.getSelectionForeground());
+		} else {
+			setBackground(list.getBackground());
+			setForeground(list.getForeground());
+		}
+		
+		setEnabled(list.isEnabled());
+		setFont(list.getFont());
+		setOpaque(true);
+		return this;
+	}
+
+}