Adding RowCollapsingPanel, which represents an object the can be collapsed.

pom.xml

@@ -4,7 +4,7 @@
 
   <groupId>org.leumasjaffe</groupId>
   <artifactId>graphics</artifactId>
-  <version>0.1</version>
+  <version>0.2</version>
   <packaging>jar</packaging>
 
   <name>graphics</name>

src/main/lombok/org/leumasjaffe/graphics/RowCollapsingPanel.java

@@ -0,0 +1,69 @@
+package org.leumasjaffe.graphics;
+
+import java.awt.Component;
+import java.awt.Dimension;
+import java.awt.Font;
+import java.awt.GridBagConstraints;
+import java.awt.GridBagLayout;
+import java.awt.Insets;
+
+import javax.swing.JButton;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+
+import lombok.AccessLevel;
+import lombok.experimental.FieldDefaults;
+
+@FieldDefaults(level=AccessLevel.PRIVATE, makeFinal=true)
+public class RowCollapsingPanel extends JPanel {
+	static String DOWN = "\u25BC";
+	static String RIGHT = "\u25B6";
+
+	public RowCollapsingPanel(GridBagLayout parentLayout, int myRow, String title, Component component) {
+		GridBagLayout gridBagLayout = new GridBagLayout();
+		gridBagLayout.columnWidths = new int[]{0, 0, 0};
+		gridBagLayout.rowHeights = new int[]{0, 0};
+		gridBagLayout.columnWeights = new double[]{0.0, 1.0, Double.MIN_VALUE};
+		gridBagLayout.rowWeights = new double[]{1.0, Double.MIN_VALUE};
+		setLayout(gridBagLayout);
+
+		JButton btnReveal = new JButton(DOWN);
+		btnReveal.setAlignmentX(Component.CENTER_ALIGNMENT);
+		btnReveal.setFont(new Font("Courier New", Font.PLAIN, 10));
+		btnReveal.setPreferredSize(new Dimension(15, 15));
+		btnReveal.setMaximumSize(new Dimension(15, 15));
+		btnReveal.setMinimumSize(new Dimension(15, 15));
+		btnReveal.setMargin(new Insets(0, 0, 0, 0));
+		GridBagConstraints gbc_btnReveal = new GridBagConstraints();
+		gbc_btnReveal.anchor = GridBagConstraints.NORTH;
+		gbc_btnReveal.insets = new Insets(0, 0, 0, 5);
+		gbc_btnReveal.gridx = 0;
+		gbc_btnReveal.gridy = 0;
+		add(btnReveal, gbc_btnReveal);
+
+		GridBagConstraints gbc_component = new GridBagConstraints();
+		gbc_component.fill = GridBagConstraints.BOTH;
+		gbc_component.gridx = 1;
+		gbc_component.gridy = 0;
+		add(component, gbc_component);
+
+		JLabel label = new JLabel(title);
+
+		btnReveal.addActionListener(e -> {
+			if (btnReveal.getText().equals(DOWN)) {
+				remove(component);
+				add(label, gbc_component);
+				btnReveal.setText(RIGHT);
+				btnReveal.setFont(new Font("Courier New", Font.PLAIN, 8));
+				parentLayout.rowWeights[myRow] = 0.0;
+			} else {
+				remove(label);
+				add(component, gbc_component);
+				btnReveal.setText(DOWN);
+				btnReveal.setFont(new Font("Courier New", Font.PLAIN, 10));
+				parentLayout.rowWeights[myRow] = 1.0;
+			}
+			validate();
+		});
+	}
+}