Merge pull request #17 from CyB3RC0nN0R/f/close_tabs

Implementing a closing button for game pane tabs

src/dev/kske/chess/ui/GameTabComponent.java

@@ -0,0 +1,99 @@
+package dev.kske.chess.ui;
+
+import java.awt.BasicStroke;
+import java.awt.Color;
+import java.awt.Dimension;
+import java.awt.FlowLayout;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+
+import javax.swing.BorderFactory;
+import javax.swing.JButton;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.JTabbedPane;
+import javax.swing.plaf.basic.BasicButtonUI;
+
+/**
+ * Project: <strong>Chess</strong><br>
+ * File: <strong>GameTabComponent.java</strong><br>
+ * Created: <strong>11 Dec 2019</strong><br>
+ *
+ * @author Kai S. K. Engelbart
+ */
+public class GameTabComponent extends JPanel {
+
+	private final JTabbedPane tabbedPane;
+
+	private static final long serialVersionUID = 9022979950018125935L;
+
+	public GameTabComponent(JTabbedPane tabbedPane) {
+		super(new FlowLayout(FlowLayout.LEFT, 0, 0));
+		if (tabbedPane == null) throw new NullPointerException("TabbedPane is null");
+		this.tabbedPane = tabbedPane;
+
+		// Create title JLabel
+		JLabel label = new JLabel() {
+
+			private static final long serialVersionUID = 7902391411509551586L;
+
+			@Override
+			public String getText() {
+				int i = tabbedPane.indexOfTabComponent(GameTabComponent.this);
+				return i != -1 ? tabbedPane.getTitleAt(i) : "";
+			}
+		};
+		label.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 5));
+		add(label);
+
+		// Create close JButton
+		add(new TabButton());
+		setBorder(BorderFactory.createEmptyBorder(2, 0, 0, 0));
+	}
+
+	private class TabButton extends JButton {
+
+		private static final long serialVersionUID = -2757857832337636731L;
+
+		public TabButton() {
+			final int size = 17;
+			setPreferredSize(new Dimension(size, size));
+			setToolTipText("Close this tab");
+			setUI(new BasicButtonUI());
+			setContentAreaFilled(false);
+			setFocusable(false);
+			setBorder(BorderFactory.createEtchedBorder());
+			setBorderPainted(false);
+			addMouseListener(new MouseAdapter() {
+
+				@Override
+				public void mouseEntered(MouseEvent evt) { setBorderPainted(true); }
+
+				@Override
+				public void mouseExited(MouseEvent evt) { setBorderPainted(false); }
+			});
+			setRolloverEnabled(true);
+			addActionListener((evt) -> { int i = tabbedPane.indexOfTabComponent(GameTabComponent.this); if (i != -1) tabbedPane.remove(i); });
+		}
+
+		@Override
+		public void updateUI() {}
+
+		@Override
+		public void paintComponent(Graphics g) {
+			super.paintComponent(g);
+			Graphics2D g2 = (Graphics2D) g.create();
+			// shift the image for pressed buttons
+			if (getModel().isPressed()) { g2.translate(1, 1); }
+			g2.setStroke(new BasicStroke(2));
+			g2.setColor(Color.BLACK);
+			if (getModel().isRollover()) { g2.setColor(Color.MAGENTA); }
+			final int delta = 6;
+			g2.drawLine(delta, delta, getWidth() - delta - 1, getHeight() - delta - 1);
+			g2.drawLine(getWidth() - delta - 1, delta, delta, getHeight() - delta - 1);
+			g2.dispose();
+		}
+	}
+}

src/dev/kske/chess/ui/MainWindow.java

@@ -91,7 +91,7 @@ public class MainWindow extends JFrame {
 	 *
 	 * @return The new {@link GamePane}
 	 */
-	public GamePane addGamePane() { return addGamePane("Game " + (tabbedPane.getComponentCount() + 1)); }
+	public GamePane addGamePane() { return addGamePane("Game " + (tabbedPane.getTabCount() + 1)); }
 
 	/**
 	 * Creates a new {@link GamePane}, adds it to the tabbed pane and opens it.
@@ -102,7 +102,8 @@ public class MainWindow extends JFrame {
 	public GamePane addGamePane(String title) {
 		GamePane gamePane = new GamePane();
 		tabbedPane.add(title, gamePane);
-		tabbedPane.setSelectedIndex(tabbedPane.getComponentCount() - 1);
+		tabbedPane.setTabComponentAt(tabbedPane.getTabCount() - 1, new GameTabComponent(tabbedPane));
+		tabbedPane.setSelectedIndex(tabbedPane.getTabCount() - 1);
 		return gamePane;
 	}