--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/draw2d/DefaultRangeModel.d	Sun Aug 03 00:52:14 2008 +0200
@@ -0,0 +1,205 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2005 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module dwtx.draw2d.DefaultRangeModel;
+
+import dwt.dwthelper.utils;
+import dwtx.dwtxhelper.Bean;
+import tango.text.convert.Format;
+
+import dwtx.draw2d.RangeModel;
+
+/**
+ * Generic implementation for a RangeModel.
+ *
+ *
+ *<pre>
+ *                    |<----extent--->|
+ *    ----|-----------|---------------|---------------|----
+ *       min          |                              max
+ *                  value
+ * </pre>
+ */
+public class DefaultRangeModel
+    : RangeModel
+{
+
+/**
+ * Listeners interested in the range model's property changes.
+ */
+protected PropertyChangeSupport propertyListeners;
+private int minimum = 0;
+private int maximum = 100;
+private int extent =  20;
+private int value = 0;
+
+public this(){
+    propertyListeners = new PropertyChangeSupport(this);
+}
+
+/**
+ * Registers the given listener as a PropertyChangeListener.
+ *
+ * @param listener the listener to be added
+ * @since 2.0
+ */
+public void addPropertyChangeListener(PropertyChangeListener listener) {
+    propertyListeners.addPropertyChangeListener(listener);
+}
+
+/**
+ * Notifies any listening PropertyChangeListeners that the property with the given id has
+ * changed.
+ *
+ * @param string the property name
+ * @param oldValue the old value
+ * @param newValue the new value
+ * @since 2.0
+ */
+protected void firePropertyChange(String string, int oldValue, int newValue) {
+    propertyListeners.firePropertyChange(string, oldValue, newValue);
+}
+
+/**
+ * @return the extent
+ */
+public int getExtent() {
+    return extent;
+}
+
+/**
+ * @return the maximum value
+ */
+public int getMaximum() {
+    return maximum;
+}
+
+/**
+ * @return the minimum value
+ */
+public int getMinimum() {
+    return minimum;
+}
+
+/**
+ * @return the current value
+ */
+public int getValue() {
+    return value;
+}
+
+/**
+ * @return whether the extent is between the minimum and maximum values
+ */
+public bool isEnabled() {
+    return (getMaximum() - getMinimum()) > getExtent();
+}
+
+/**
+ * Removes the given PropertyChangeListener from the list of listeners.
+ *
+ * @param listener the listener to be removed
+ */
+public void removePropertyChangeListener(PropertyChangeListener listener) {
+    propertyListeners.removePropertyChangeListener(listener);
+}
+
+/**
+ * @see dwtx.draw2d.RangeModel#setAll(int, int, int)
+ */
+public void setAll(int min, int ext, int max) {
+    int oldMin = minimum;
+    int oldExtent = extent;
+    int oldMax = maximum;
+    maximum = max;
+    minimum = min;
+    extent = ext;
+    if (oldMax !is max)
+        firePropertyChange(PROPERTY_MAXIMUM, oldMax, max);
+    if (oldExtent !is ext)
+        firePropertyChange(PROPERTY_EXTENT, oldExtent, ext);
+    if (oldMin !is min)
+        firePropertyChange(PROPERTY_MINIMUM, oldMin, min);
+    setValue(getValue());
+}
+
+/**
+ * Sets this RangeModel's extent and fires a property change if the given value is
+ * different from the current extent.
+ *
+ * @param extent the new extent value
+ */
+public void setExtent(int extent) {
+    if (this.extent is extent)
+        return;
+    int oldValue = this.extent;
+    this.extent = extent;
+    firePropertyChange(PROPERTY_EXTENT, oldValue, extent);
+    setValue(getValue());
+}
+
+/**
+ * Sets this RangeModel's maximum value and fires a property change if the given value is
+ * different from the current maximum value.
+ *
+ * @param maximum the new maximum value
+ */
+public void setMaximum(int maximum) {
+    if (this.maximum is maximum)
+        return;
+    int oldValue = this.maximum;
+    this.maximum = maximum;
+    firePropertyChange(PROPERTY_MAXIMUM, oldValue, maximum);
+    setValue(getValue());
+}
+
+/**
+ * Sets this RangeModel's minimum value and fires a property change if the given value is
+ * different from the current minimum value.
+ *
+ * @param minimum the new minumum value
+ */
+public void setMinimum(int minimum) {
+    if (this.minimum is minimum)
+        return;
+    int oldValue = this.minimum;
+    this.minimum = minimum;
+    firePropertyChange(PROPERTY_MINIMUM, oldValue, minimum);
+    setValue(getValue());
+}
+
+/**
+ * Sets this RangeModel's current value.  If the given value is greater than the maximum,
+ * the maximum value is used.  If the given value is less than the minimum, the minimum
+ * value is used.  If the adjusted value is different from the current value, a property
+ * change is fired.
+ *
+ * @param value the new value
+ */
+public void setValue(int value) {
+    value = Math.max(getMinimum(), Math.min(getMaximum() - getExtent(), value));
+    if (this.value is value)
+        return;
+    int oldValue = this.value;
+    this.value = value;
+    firePropertyChange(PROPERTY_VALUE, oldValue, value);
+}
+
+/**
+ * @see java.lang.Object#toString()
+ */
+public String toString() {
+    return Format( "{} ({}, {}, {}, {})", super.toString(), minimum, maximum //$NON-NLS-2$ //$NON-NLS-1$
+            , extent, value ); //$NON-NLS-3$ //$NON-NLS-2$ //$NON-NLS-1$
+}
+
+}