add: TranslucentThumbDivider

TranslucentThumbDivider/config.gradle

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+vendor  = 'Java Swing Tips - https://ateraimemo.com/'
+version = '1.0.0'
+year    = '2003-2017'
+
+main.class = 'example.MainPanel'
+runtime.classpath = '.'

TranslucentThumbDivider/config/jnlp.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project>
+  <property name="jnlp.title"    value="JST TranslucentThumbDivider" />
+  <property name="jnlp.Name"     value="TranslucentThumbDivider" />
+  <property name="jnlp.name"     value="translucentthumbdivider" />
+  <property name="jnlp.codebase" value="https://ateraimemo.com/swing/translucentthumbdivider/" />
+  <property name="jnlp.homepage" value="https://ateraimemo.com/Swing/TranslucentThumbDivider.html" />
+</project>

TranslucentThumbDivider/config/properties.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project>
+<!-- project -->
+<property name="Name"    value="Example" />
+<property name="name"    value="example" />
+<property name="vendor"  value="Java Swing Tips - https://ateraimemo.com/" />
+<property name="version" value="1.0.0" />
+<property name="year"    value="2003-2018" />
+
+<!-- class -->
+<property name="main.class"        value="example.MainPanel" />
+<property name="runtime.classpath" value="." />
+
+<!-- compile -->
+<property name="compile.debug"       value="on" />
+<property name="compile.optimize"    value="on" />
+<property name="compile.nowarn"      value="off" />
+<property name="compile.deprecation" value="on" />
+<property name="compile.verbose"     value="off" />
+<property name="compile.source"      value="1.8" />
+<property name="compile.encoding"    value="UTF-8" />
+
+<!-- javadoc -->
+<property name="javadoc.encoding"    value="UTF-8" />
+<property name="javadoc.docencoding" value="UTF-8" />
+<property name="javadoc.pkgs"        value="*" />
+<property name="javadoc.locale"      value="ja" />
+<property name="javadoc.link"        value="https://docs.oracle.com/javase/jp/8/docs/api/" />
+
+<!-- signjar -->
+<property name="signjar.keystore" value="myKeyStore" />
+<property name="signjar.alias"    value="myAlias" />
+
+<!-- directory -->
+<property name="lib.dir"  value="lib" />
+<property name="src.dir"  value="src/java" />
+<property name="res.dir"  value="src/conf" />
+<property name="web.dir"  value="src/web" />
+<property name="conf.dir" value="src/conf" />
+<property name="bkup.dir" value="bkuptmp" />
+
+<!-- target -->
+<property name="build.dir"            value="target" />
+<property name="build.src"            value="${build.dir}/src" />
+<property name="build.dest"           value="${build.dir}/classes" />
+<property name="build.docs"           value="${build.dir}/apidocs" />
+<property name="build.reports"        value="${build.dir}/reports" />
+<property name="build.correctreports" value="${build.dir}/correctreports" />
+<property name="build.res"            value="${build.dest}/resources" />
+<property name="build.conf"           value="${build.dest}/conf" />
+
+</project>

TranslucentThumbDivider/run.bat

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+@echo off
+setlocal
+echo Swing Example
+echo -------------------
+
+if "%JAVA_HOME%" == "" goto :error
+set MAIN_CLASS=example.MainPanel
+set CLASSPATH=target\classes;lib\*
+
+echo Running with classpath "%CLASSPATH%"
+echo Starting...
+"%JAVA_HOME%\bin\java.exe" -classpath "%CLASSPATH%" %MAIN_CLASS% %*
+
+goto :end
+
+:error
+echo ERROR: JAVA_HOME not found in your environment.
+echo Please, set the JAVA_HOME variable in your environment to match the
+echo location of the Java Virtual Machine you want to use.
+
+:end

TranslucentThumbDivider/run.sh

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+#!/bin/sh
+
+echo
+echo "Swing Example"
+echo "-------------------"
+echo
+
+if [ "$JAVA_HOME" = "" ] ; then
+  echo "ERROR: JAVA_HOME not found in your environment."
+  echo
+  echo "Please, set the JAVA_HOME variable in your environment to match the"
+  echo "location of the Java Virtual Machine you want to use."
+  exit 1
+fi
+
+if [ `uname | grep -n CYGWIN` ]; then
+  PS=";"
+elif [ `uname | grep -n Windows` ]; then
+  PS=";"
+else
+  PS=":"
+fi
+
+LOCALCLASSPATH=target/classes${PS}lib/*
+
+echo Running with classpath $LOCALCLASSPATH
+echo Starting...
+echo
+
+"$JAVA_HOME/bin/java" -classpath "$LOCALCLASSPATH" example.MainPanel $*

TranslucentThumbDivider/src/java/example/MainPanel.java

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+package example;
+// -*- mode:java; encoding:utf-8 -*-
+// vim:set fileencoding=utf-8:
+// @homepage@
+import java.awt.*;
+import java.awt.color.ColorSpace;
+import java.awt.event.MouseEvent;
+import java.awt.geom.Ellipse2D;
+import java.awt.image.BufferedImage;
+import java.awt.image.ColorConvertOp;
+import java.util.Objects;
+import javax.swing.*;
+import javax.swing.plaf.LayerUI;
+
+public final class MainPanel extends JPanel {
+    private MainPanel() {
+        super(new BorderLayout());
+
+        JSplitPane split = new JSplitPane();
+        split.setContinuousLayout(true);
+        split.setResizeWeight(.5);
+        split.setDividerSize(0);
+
+        ImageIcon icon = new ImageIcon(getClass().getResource("test.png"));
+
+        BufferedImage source = new BufferedImage(icon.getIconWidth(), icon.getIconHeight(), BufferedImage.TYPE_INT_ARGB);
+        Graphics g = source.createGraphics();
+        g.drawImage(icon.getImage(), 0, 0, null);
+        g.dispose();
+        ColorConvertOp colorConvert = new ColorConvertOp(ColorSpace.getInstance(ColorSpace.CS_GRAY), null);
+        BufferedImage destination = colorConvert.filter(source, null);
+
+        Component beforeCanvas = new JComponent() {
+            @Override protected void paintComponent(Graphics g) {
+                super.paintComponent(g);
+                g.drawImage(icon.getImage(), 0, 0, icon.getIconWidth(), icon.getIconHeight(), this);
+            }
+        };
+        split.setLeftComponent(beforeCanvas);
+
+        Component afterCanvas = new JComponent() {
+            @Override protected void paintComponent(Graphics g) {
+                super.paintComponent(g);
+                Graphics2D g2 = (Graphics2D) g.create();
+                int iw = icon.getIconWidth();
+                int ih = icon.getIconHeight();
+                Point pt = getLocation();
+                Insets ins = split.getBorder().getBorderInsets(split);
+                g2.translate(-pt.x + ins.left, 0);
+                g2.drawImage(destination, 0, 0, iw, ih, this);
+                g2.dispose();
+            }
+        };
+        split.setRightComponent(afterCanvas);
+
+        add(new JLayer<>(split, new DividerLocationDragLayerUI()));
+        setOpaque(false);
+        setPreferredSize(new Dimension(320, 240));
+    }
+    public static void main(String... args) {
+        EventQueue.invokeLater(new Runnable() {
+            @Override public void run() {
+                createAndShowGui();
+            }
+        });
+    }
+    public static void createAndShowGui() {
+        try {
+            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
+        } catch (ClassNotFoundException | InstantiationException
+               | IllegalAccessException | UnsupportedLookAndFeelException ex) {
+            ex.printStackTrace();
+        }
+        JFrame frame = new JFrame("@title@");
+        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
+        frame.getContentPane().add(new MainPanel());
+        frame.setResizable(false);
+        frame.pack();
+        frame.setLocationRelativeTo(null);
+        frame.setVisible(true);
+    }
+}
+
+class DividerLocationDragLayerUI extends LayerUI<JSplitPane> {
+    private static final int R = 25;
+    private final Point startPt = new Point();
+    private final Cursor dc = Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR);
+    private final Cursor wc = Cursor.getPredefinedCursor(Cursor.W_RESIZE_CURSOR);
+    private final Ellipse2D thumb = new Ellipse2D.Double();
+    private int dividerLocation;
+    private boolean isDragging;
+    private boolean isEnter;
+
+    @Override public void installUI(JComponent c) {
+        super.installUI(c);
+        if (c instanceof JLayer) {
+            ((JLayer<?>) c).setLayerEventMask(AWTEvent.MOUSE_EVENT_MASK | AWTEvent.MOUSE_MOTION_EVENT_MASK);
+        }
+    }
+    @Override public void uninstallUI(JComponent c) {
+        if (c instanceof JLayer) {
+            ((JLayer<?>) c).setLayerEventMask(0);
+        }
+        super.uninstallUI(c);
+    }
+    @Override public void paint(Graphics g, JComponent c) {
+        super.paint(g, c);
+        if ((isEnter || isDragging) && c instanceof JLayer) {
+            updateThumbLocation(((JLayer<?>) c).getView(), thumb);
+            Graphics2D g2 = (Graphics2D) g.create();
+            g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
+            g2.setPaint(new Color(255, 100, 100, 100));
+            g2.fill(thumb);
+            g2.dispose();
+        }
+    }
+    @Override protected void processMouseEvent(MouseEvent e, JLayer<? extends JSplitPane> l) {
+        JSplitPane splitPane = l.getView();
+        switch (e.getID()) {
+            case MouseEvent.MOUSE_ENTERED:
+                isEnter = true;
+                break;
+            case MouseEvent.MOUSE_EXITED:
+                isEnter = false;
+                break;
+            case MouseEvent.MOUSE_RELEASED:
+                isDragging = false;
+                break;
+            case MouseEvent.MOUSE_PRESSED:
+                Component c = e.getComponent();
+                if (isDraggableComponent(splitPane, c)) {
+                    Point pt = SwingUtilities.convertPoint(c, e.getPoint(), splitPane);
+                    isDragging = thumb.contains(pt);
+                    startPt.setLocation(SwingUtilities.convertPoint(c, e.getPoint(), splitPane));
+                    dividerLocation = splitPane.getDividerLocation();
+                }
+                break;
+            default:
+                break;
+        }
+        splitPane.repaint();
+    }
+    @Override protected void processMouseMotionEvent(MouseEvent e, JLayer<? extends JSplitPane> l) {
+        JSplitPane splitPane = l.getView();
+        Component c = e.getComponent();
+        Point pt = SwingUtilities.convertPoint(c, e.getPoint(), splitPane);
+        if (e.getID() == MouseEvent.MOUSE_MOVED) {
+            splitPane.setCursor(thumb.contains(e.getPoint()) ? wc : dc);
+        } else if (isDragging && isDraggableComponent(splitPane, c) && e.getID() == MouseEvent.MOUSE_DRAGGED) {
+            int delta = splitPane.getOrientation() == JSplitPane.HORIZONTAL_SPLIT ? pt.x - startPt.x : pt.y - startPt.y;
+            splitPane.setDividerLocation(Math.max(0, dividerLocation + delta));
+        }
+    }
+    private static boolean isDraggableComponent(JSplitPane splitPane, Component c) {
+        return Objects.equals(splitPane, c) || Objects.equals(splitPane, SwingUtilities.getUnwrappedParent(c));
+    }
+    private static void updateThumbLocation(Component c, Ellipse2D thumb) {
+        if (c instanceof JSplitPane) {
+            JSplitPane splitPane = (JSplitPane) c;
+            int pos = splitPane.getDividerLocation();
+            if (splitPane.getOrientation() == JSplitPane.HORIZONTAL_SPLIT) {
+                thumb.setFrame(pos - R, splitPane.getHeight() / 2 - R, R + R, R + R);
+            } else {
+                thumb.setFrame(splitPane.getWidth() / 2 - R, pos - R, R + R, R + R);
+            }
+        }
+    }
+}

TranslucentThumbDivider/src/web/example.jnlp

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+<?xml version="1.0" encoding="UTF-8"?>
+<jnlp spec="1.0+" codebase="@codebase@" href="example.jnlp">
+  <information>
+    <title>@title@</title>
+    <vendor>@vendor@</vendor>
+    <homepage href="@homepage@" />
+    <description>Swing Example</description>
+    <description kind="short">example</description>
+  </information>
+  <update check="timeout" policy="always" />
+  <resources>
+    <java version="@compile.source@+" />
+    <jar href="example.jar" main="true" />
+  </resources>
+  <application-desc main-class="@main.class@" />
+</jnlp>

TranslucentThumbDivider/src/web/index.html

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+<html lang="ja">
+<head>
+<meta charset="utf-8" />
+<title>@title@</title>
+<link rel="canonical" href="@homepage@" />
+<script type="text/javascript">
+location.replace('@homepage@');
+</script>
+<meta http-equiv="Refresh" content="0; URL=@homepage@" />
+</head>
+<body>
+<noscript>
+<p><a href="@homepage@">@title@</a></p>
+</noscript>
+</body>
+</html>