diff --git a/examples/forms/progressbar.own b/examples/forms/progressbar.own
new file mode 100644
index 0000000..261587f
--- /dev/null
+++ b/examples/forms/progressbar.own
@@ -0,0 +1,29 @@
+use "forms"
+
+label = newLabel("Current value: 50")
+progressBar = newProgressBar()
+progressBar.setValue(50)
+progressBar.onChange(def() {
+  label.setText("Current value: " + progressBar.getValue())
+})
+minusBtn = newButton("-1")
+minusBtn.onClick(def() = changeProgress(-1))
+plusBtn = newButton("+1")
+plusBtn.onClick(def() = changeProgress(1))
+
+def changeProgress(delta) {
+  value = progressBar.getValue() + delta
+  if (value > 100) value = 100
+  else if (value < 0) value = 0
+  progressBar.setValue(value)
+}
+
+window = newWindow("ProgressBar example")
+window.add(minusBtn, BorderLayout.WEST)
+window.add(progressBar, BorderLayout.CENTER)
+window.add(plusBtn, BorderLayout.EAST)
+window.add(label, BorderLayout.SOUTH)
+window.pack()
+window.setLocationByPlatform()
+window.setResizable(false)
+window.setVisible()
\ No newline at end of file
diff --git a/src/main/java/com/annimon/ownlang/lib/Converters.java b/src/main/java/com/annimon/ownlang/lib/Converters.java
index 3c14435..9415df0 100644
--- a/src/main/java/com/annimon/ownlang/lib/Converters.java
+++ b/src/main/java/com/annimon/ownlang/lib/Converters.java
@@ -158,6 +158,18 @@ public final class Converters {
             return NumberValue.ZERO;
         });
     }
+    
+    public static FunctionValue intOptToVoid(VoidToVoidFunction f1, IntToVoidFunction f2) {
+        return new FunctionValue(args -> {
+            Arguments.checkOrOr(0, 1, args.length);
+            if (args.length == 0) {
+                f1.apply();
+            } else {
+                f2.apply(args[0].asInt());
+            }
+            return NumberValue.ZERO;
+        });
+    }
 
     public static FunctionValue intToLong(IntToLongFunction f) {
         return new FunctionValue(args -> {
@@ -168,7 +180,7 @@ public final class Converters {
 
     public static FunctionValue int2ToVoid(Int2ToVoidFunction f) {
         return new FunctionValue(args -> {
-            Arguments.check(4, args.length);
+            Arguments.check(2, args.length);
             f.apply(args[0].asInt(),
                     args[1].asInt());
             return NumberValue.ZERO;
diff --git a/src/main/java/com/annimon/ownlang/modules/forms/Components.java b/src/main/java/com/annimon/ownlang/modules/forms/Components.java
index f283e5a..9e2e7d8 100644
--- a/src/main/java/com/annimon/ownlang/modules/forms/Components.java
+++ b/src/main/java/com/annimon/ownlang/modules/forms/Components.java
@@ -6,6 +6,8 @@ import javax.swing.JButton;
 import javax.swing.JFrame;
 import javax.swing.JLabel;
 import javax.swing.JPanel;
+import javax.swing.JProgressBar;
+import javax.swing.JTextArea;
 import javax.swing.JTextField;
 import javax.swing.SwingConstants;
 
@@ -16,7 +18,7 @@ public final class Components {
 
     private Components() { }
 
-    static Value newWindow(Value... args) {
+    static Value newWindow(Value[] args) {
         Arguments.checkOrOr(0, 1, args.length);
         String title = (args.length == 1) ? args[0].asString() : "";
         final JFrame frame = new JFrame(title);
@@ -24,7 +26,7 @@ public final class Components {
         return new JFrameValue(frame);
     }
 
-    static Value newPanel(Value... args) {
+    static Value newPanel(Value[] args) {
         Arguments.checkOrOr(0, 1, args.length);
         final JPanel panel = new JPanel();
         if (args.length == 1) {
@@ -33,22 +35,57 @@ public final class Components {
         return new JPanelValue(panel);
     }
 
-    static Value newButton(Value... args) {
+    static Value newButton(Value[] args) {
         Arguments.checkOrOr(0, 1, args.length);
         String text = (args.length == 1) ? args[0].asString() : "";
         return new JButtonValue(new JButton(text));
     }
 
-    static Value newLabel(Value... args) {
+    static Value newLabel(Value[] args) {
         Arguments.checkRange(0, 2, args.length);
         String text = (args.length >= 1) ? args[0].asString() : "";
         int align = (args.length == 2) ? args[1].asInt() : SwingConstants.LEADING;
         return new JLabelValue(new JLabel(text, align));
     }
 
-    static Value newTextField(Value... args) {
-        Arguments.checkOrOr(0, 1, args.length);
-        String text = (args.length == 1) ? args[0].asString() : "";
-        return new JTextFieldValue(new JTextField(text));
+    static Value newTextField(Value[] args) {
+        Arguments.checkRange(0, 2, args.length);
+        String text = "";
+        int cols = 0;
+        switch (args.length) {
+            case 1: {
+                text = args[0].asString();
+            } break;
+            case 2: {
+                text = args[0].asString();
+                cols = args[1].asInt();
+            } break;
+        }
+        return new JTextFieldValue(new JTextField(text, cols));
+    }
+    
+    static Value newProgressBar(Value[] args) {
+        Arguments.checkRange(0, 3, args.length);
+        boolean isVertical = false;
+        int min = 0;
+        int max = 100;
+        switch (args.length) {
+            case 1: {
+                isVertical = args[0].asInt() != 0;
+            } break;
+            case 2: {
+                min = args[0].asInt();
+                max = args[1].asInt();
+            } break;
+            case 3: {
+                isVertical = args[0].asInt() != 0;
+                min = args[1].asInt();
+                max = args[2].asInt();
+            } break;
+        }
+        return new JProgressBarValue(new JProgressBar(
+                isVertical ? SwingConstants.VERTICAL : SwingConstants.HORIZONTAL,
+                min, max
+        ));
     }
 }
diff --git a/src/main/java/com/annimon/ownlang/modules/forms/JProgressBarValue.java b/src/main/java/com/annimon/ownlang/modules/forms/JProgressBarValue.java
new file mode 100644
index 0000000..5417e5e
--- /dev/null
+++ b/src/main/java/com/annimon/ownlang/modules/forms/JProgressBarValue.java
@@ -0,0 +1,51 @@
+package com.annimon.ownlang.modules.forms;
+
+import com.annimon.ownlang.lib.Arguments;
+import static com.annimon.ownlang.lib.Converters.*;
+import com.annimon.ownlang.lib.Function;
+import com.annimon.ownlang.lib.FunctionValue;
+import com.annimon.ownlang.lib.NumberValue;
+import com.annimon.ownlang.lib.Value;
+import com.annimon.ownlang.lib.ValueUtils;
+import javax.swing.JProgressBar;
+
+public class JProgressBarValue extends JComponentValue {
+
+    final JProgressBar progressBar;
+
+    public JProgressBarValue(JProgressBar progressBar) {
+        super(19, progressBar);
+        this.progressBar = progressBar;
+        init();
+    }
+
+    private void init() {
+        set("onChange", new FunctionValue(this::addChangeListener));
+        set("addChangeListener", new FunctionValue(this::addChangeListener));
+        set("getMinimum", voidToInt(progressBar::getMinimum));
+        set("getMaximum", voidToInt(progressBar::getMaximum));
+        set("getOrientation", voidToInt(progressBar::getOrientation));
+        set("getValue", voidToInt(progressBar::getValue));
+        set("isBorderPainted", voidToBoolean(progressBar::isBorderPainted));
+        set("isIndeterminate", voidToBoolean(progressBar::isIndeterminate));
+        set("isStringPainted", voidToBoolean(progressBar::isStringPainted));
+        set("getString", voidToString(progressBar::getString));
+        set("getPercentComplete", voidToDouble(progressBar::getPercentComplete));
+        
+        set("setMinimum", intToVoid(progressBar::setMinimum));
+        set("setMaximum", intToVoid(progressBar::setMaximum));
+        set("setBorderPainted", booleanToVoid(progressBar::setBorderPainted));
+        set("setIndeterminate", booleanToVoid(progressBar::setIndeterminate));
+        set("setOrientation", intToVoid(progressBar::setOrientation));
+        set("setStringPainted", booleanToVoid(progressBar::setStringPainted));
+        set("setString", stringToVoid(progressBar::setString));
+        set("setValue", intToVoid(progressBar::setValue));
+    }
+    
+    private Value addChangeListener(Value[] args) {
+        Arguments.check(1, args.length);
+        final Function action = ValueUtils.consumeFunction(args[0], 0);
+        progressBar.addChangeListener(e -> action.execute());
+        return NumberValue.ZERO;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/annimon/ownlang/modules/forms/LayoutManagers.java b/src/main/java/com/annimon/ownlang/modules/forms/LayoutManagers.java
index 45558f2..262e168 100644
--- a/src/main/java/com/annimon/ownlang/modules/forms/LayoutManagers.java
+++ b/src/main/java/com/annimon/ownlang/modules/forms/LayoutManagers.java
@@ -15,7 +15,7 @@ public final class LayoutManagers {
 
     private LayoutManagers() { }
 
-    static Value borderLayout(Value... args) {
+    static Value borderLayout(Value[] args) {
         Arguments.checkOrOr(0, 2, args.length);
         int hgap = (args.length == 2) ? args[0].asInt() : 0;
         int vgap = (args.length == 2) ? args[1].asInt() : 0;
@@ -24,7 +24,7 @@ public final class LayoutManagers {
         );
     }
 
-    static Value boxLayout(Value... args) {
+    static Value boxLayout(Value[] args) {
         Arguments.checkOrOr(1, 2, args.length);
         int axis = (args.length == 2) ? args[1].asInt() : BoxLayout.PAGE_AXIS;
         return new LayoutManagerValue(
@@ -32,7 +32,7 @@ public final class LayoutManagers {
         );
     }
 
-    static Value cardLayout(Value... args) {
+    static Value cardLayout(Value[] args) {
         Arguments.checkOrOr(0, 2, args.length);
         int hgap = (args.length == 2) ? args[0].asInt() : 0;
         int vgap = (args.length == 2) ? args[1].asInt() : 0;
@@ -41,7 +41,7 @@ public final class LayoutManagers {
         );
     }
 
-    static Value gridLayout(Value... args) {
+    static Value gridLayout(Value[] args) {
         Arguments.checkRange(0, 4, args.length);
         int rows = 1, cols = 0, hgap = 0, vgap = 0;
         switch (args.length) {
@@ -69,7 +69,7 @@ public final class LayoutManagers {
         );
     }
 
-    static Value flowLayout(Value... args) {
+    static Value flowLayout(Value[] args) {
         Arguments.checkRange(0, 3, args.length);
         final int align, hgap, vgap;
         switch (args.length) {
diff --git a/src/main/java/com/annimon/ownlang/modules/forms/forms.java b/src/main/java/com/annimon/ownlang/modules/forms/forms.java
index 477f7ff..af761ab 100644
--- a/src/main/java/com/annimon/ownlang/modules/forms/forms.java
+++ b/src/main/java/com/annimon/ownlang/modules/forms/forms.java
@@ -75,6 +75,7 @@ public final class forms implements Module {
         Functions.set("newButton", Components::newButton);
         Functions.set("newLabel", Components::newLabel);
         Functions.set("newPanel", Components::newPanel);
+        Functions.set("newProgressBar", Components::newProgressBar);
         Functions.set("newTextField", Components::newTextField);
         Functions.set("newWindow", Components::newWindow);