From 4a2d6f913bfe2e6b64fa154fdd0f8e74fb558543 Mon Sep 17 00:00:00 2001
From: DieGurke <55625494+DieGurke@users.noreply.github.com>
Date: Sat, 14 Dec 2019 19:10:45 +0100
Subject: [PATCH] Custom scroll bar

* Added PrimaryScrollBar class
* Implemented PrimaryScrollBar in ChatWindow for the ScrollPanes
vertical scroll bar
---
 src/main/java/envoy/client/ui/ChatWindow.java | 11 +++
 .../envoy/client/ui/PrimaryScrollBar.java     | 95 +++++++++++++++++++
 2 files changed, 106 insertions(+)
 create mode 100644 src/main/java/envoy/client/ui/PrimaryScrollBar.java

diff --git a/src/main/java/envoy/client/ui/ChatWindow.java b/src/main/java/envoy/client/ui/ChatWindow.java
index 1c562b6..a6510ec 100644
--- a/src/main/java/envoy/client/ui/ChatWindow.java
+++ b/src/main/java/envoy/client/ui/ChatWindow.java
@@ -1,5 +1,6 @@
 package envoy.client.ui;
 
+import java.awt.Color;
 import java.awt.ComponentOrientation;
 import java.awt.Font;
 import java.awt.GridBagConstraints;
@@ -252,6 +253,16 @@ public class ChatWindow extends JFrame {
 		// scrollPane
 		scrollPane.setForeground(theme.getBackgroundColor());
 		scrollPane.setBackground(theme.getCellColor());
+		// scrollPane.getVerticalScrollBar()
+		// .setBackground(
+		// new Color(theme.getBackgroundColor().getRed() + 50,
+		// theme.getBackgroundColor().getGreen() + 50,
+		// theme.getBackgroundColor().getBlue() + 50));
+		scrollPane.getVerticalScrollBar().setBackground(theme.getCellColor());
+		scrollPane.getVerticalScrollBar()
+			.setUI(new PrimaryScrollBar(5, theme.getInteractableBackgroundColor(),
+					new Color(theme.getInteractableBackgroundColor().getRGB() - 50),
+					new Color(theme.getInteractableBackgroundColor().getRGB() + 170)));
 		// messageEnterTextArea
 		messageEnterTextArea.setCaretColor(theme.getTypingMessageColor());
 		messageEnterTextArea.setForeground(theme.getTypingMessageColor());
diff --git a/src/main/java/envoy/client/ui/PrimaryScrollBar.java b/src/main/java/envoy/client/ui/PrimaryScrollBar.java
new file mode 100644
index 0000000..aaaa0a0
--- /dev/null
+++ b/src/main/java/envoy/client/ui/PrimaryScrollBar.java
@@ -0,0 +1,95 @@
+package envoy.client.ui;
+
+import java.awt.Color;
+import java.awt.Dimension;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.Rectangle;
+import java.awt.RenderingHints;
+
+import javax.swing.JButton;
+import javax.swing.JComponent;
+import javax.swing.JScrollBar;
+import javax.swing.plaf.basic.BasicScrollBarUI;
+
+import envoy.client.Settings;
+
+/**
+ * Project: <strong>envoy-client</strong><br>
+ * File: <strong>PrimaryScrollBar.javaEvent.java</strong><br>
+ * Created: <strong>14.12.2019</strong><br>
+ * 
+ * @author Maximilian K&auml;fer
+ * @since Envoy v0.2-alpha
+ */
+public class PrimaryScrollBar extends BasicScrollBarUI{
+	
+	private final Dimension	d	= new Dimension();
+	private int				arcSize;
+	private Color			scrollBarColor;
+	private Color			hoverColor;
+	private Color			draggingColor;
+	
+	public PrimaryScrollBar(int arcSize, Color scrollBarColor, Color hoverColor, Color draggingColor) {
+		this.arcSize = arcSize;
+		this.scrollBarColor	= scrollBarColor;
+		this.hoverColor		= hoverColor;
+		this.draggingColor	= draggingColor;
+	}
+
+	@Override
+	protected JButton createDecreaseButton(int orientation) {
+		return new JButton() {
+			private static final long serialVersionUID = 1032443171070235890L;
+
+			@Override
+			public Dimension getPreferredSize() {
+				return d;
+			}
+		};
+	}
+	
+	@Override
+	protected JButton createIncreaseButton (int orientation) {
+		return new JButton() {
+
+			private static final long serialVersionUID = 7575774542623215803L;
+
+			@Override
+			public Dimension getPreferredSize() {
+				return d;
+			}
+		};
+	}
+	@Override
+	protected void paintTrack(Graphics g, JComponent c, Rectangle r) {
+	}
+	
+	@Override
+	protected void paintThumb(Graphics g, JComponent c, Rectangle r) {
+		Graphics2D g2 = (Graphics2D) g.create();
+		g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
+		Color		color	= null;
+		JScrollBar	sb		= (JScrollBar) c;
+		if (!sb.isEnabled() || r.width > r.height) {
+			return;
+		} else if (isDragging) {
+			color = draggingColor;
+		} else if (isThumbRollover()) {
+			color = hoverColor;
+		} else {
+			color = scrollBarColor;
+		}
+		g2.setPaint(color);
+		g2.fillRoundRect(r.x + 9, r.y, r.width - 10, r.height, arcSize, arcSize);
+		g2.setPaint(Settings.getInstance().getThemes().get(Settings.getInstance().getCurrentTheme()).getCellColor());
+		g2.drawRoundRect(r.x + 9, r.y, r.width - 10, r.height, arcSize, arcSize);
+		g2.dispose();
+	}
+
+	@Override
+	protected void setThumbBounds(int x, int y, int width, int height) {
+		super.setThumbBounds(x, y, width, height);
+		scrollbar.repaint();
+	}
+}