--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/jface/preference/ComboFieldEditor.d	Sat Apr 05 01:45:47 2008 +0200
@@ -0,0 +1,213 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2006 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.jface.preference.ComboFieldEditor;
+
+import dwtx.jface.preference.FieldEditor;
+
+import dwt.DWT;
+import dwt.events.SelectionAdapter;
+import dwt.events.SelectionEvent;
+import dwt.layout.GridData;
+import dwt.widgets.Combo;
+import dwt.widgets.Composite;
+import dwt.widgets.Control;
+import dwtx.core.runtime.Assert;
+
+import dwt.dwthelper.utils;
+
+/**
+ * A field editor for a combo box that allows the drop-down selection of one of
+ * a list of items.
+ *
+ * @since 3.3
+ */
+public class ComboFieldEditor : FieldEditor {
+
+    /**
+     * The <code>Combo</code> widget.
+     */
+    private Combo fCombo;
+
+    /**
+     * The value (not the name) of the currently selected item in the Combo widget.
+     */
+    private String fValue;
+
+    /**
+     * The names (labels) and underlying values to populate the combo widget.  These should be
+     * arranged as: { {name1, value1}, {name2, value2}, ...}
+     */
+    private String[][] fEntryNamesAndValues;
+
+    /**
+     * Create the combo box field editor.
+     *
+     * @param name the name of the preference this field editor works on
+     * @param labelText the label text of the field editor
+     * @param entryNamesAndValues the names (labels) and underlying values to populate the combo widget.  These should be
+     * arranged as: { {name1, value1}, {name2, value2}, ...}
+     * @param parent the parent composite
+     */
+    public this(String name, String labelText, String[][] entryNamesAndValues, Composite parent) {
+        init(name, labelText);
+        Assert.isTrue(checkArray(entryNamesAndValues));
+        fEntryNamesAndValues = entryNamesAndValues;
+        createControl(parent);
+    }
+
+    /**
+     * Checks whether given <code>String[][]</code> is of "type"
+     * <code>String[][2]</code>.
+     *
+     * @return <code>true</code> if it is ok, and <code>false</code> otherwise
+     */
+    private bool checkArray(String[][] table) {
+        if (table is null) {
+            return false;
+        }
+        for (int i = 0; i < table.length; i++) {
+            String[] array = table[i];
+            if (array is null || array.length !is 2) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    /* (non-Javadoc)
+     * @see dwtx.jface.preference.FieldEditor#adjustForNumColumns(int)
+     */
+    protected void adjustForNumColumns(int numColumns) {
+        if (numColumns > 1) {
+            Control control = getLabelControl();
+            int left = numColumns;
+            if (control !is null) {
+                (cast(GridData)control.getLayoutData()).horizontalSpan = 1;
+                left = left - 1;
+            }
+            (cast(GridData)fCombo.getLayoutData()).horizontalSpan = left;
+        } else {
+            Control control = getLabelControl();
+            if (control !is null) {
+                (cast(GridData)control.getLayoutData()).horizontalSpan = 1;
+            }
+            (cast(GridData)fCombo.getLayoutData()).horizontalSpan = 1;
+        }
+    }
+
+    /* (non-Javadoc)
+     * @see dwtx.jface.preference.FieldEditor#doFillIntoGrid(dwt.widgets.Composite, int)
+     */
+    protected void doFillIntoGrid(Composite parent, int numColumns) {
+        int comboC = 1;
+        if (numColumns > 1) {
+            comboC = numColumns - 1;
+        }
+        Control control = getLabelControl(parent);
+        GridData gd = new GridData();
+        gd.horizontalSpan = 1;
+        control.setLayoutData(gd);
+        control = getComboBoxControl(parent);
+        gd = new GridData();
+        gd.horizontalSpan = comboC;
+        gd.horizontalAlignment = GridData.FILL;
+        control.setLayoutData(gd);
+        control.setFont(parent.getFont());
+    }
+
+    /* (non-Javadoc)
+     * @see dwtx.jface.preference.FieldEditor#doLoad()
+     */
+    protected void doLoad() {
+        updateComboForValue(getPreferenceStore().getString(getPreferenceName()));
+    }
+
+    /* (non-Javadoc)
+     * @see dwtx.jface.preference.FieldEditor#doLoadDefault()
+     */
+    protected void doLoadDefault() {
+        updateComboForValue(getPreferenceStore().getDefaultString(getPreferenceName()));
+    }
+
+    /* (non-Javadoc)
+     * @see dwtx.jface.preference.FieldEditor#doStore()
+     */
+    protected void doStore() {
+        if (fValue is null) {
+            getPreferenceStore().setToDefault(getPreferenceName());
+            return;
+        }
+        getPreferenceStore().setValue(getPreferenceName(), fValue);
+    }
+
+    /* (non-Javadoc)
+     * @see dwtx.jface.preference.FieldEditor#getNumberOfControls()
+     */
+    public int getNumberOfControls() {
+        return 2;
+    }
+
+    /*
+     * Lazily create and return the Combo control.
+     */
+    private Combo getComboBoxControl(Composite parent) {
+        if (fCombo is null) {
+            fCombo = new Combo(parent, DWT.READ_ONLY);
+            fCombo.setFont(parent.getFont());
+            for (int i = 0; i < fEntryNamesAndValues.length; i++) {
+                fCombo.add(fEntryNamesAndValues[i][0], i);
+            }
+
+            fCombo.addSelectionListener(new class SelectionAdapter {
+                public void widgetSelected(SelectionEvent evt) {
+                    String oldValue = fValue;
+                    String name = fCombo.getText();
+                    fValue = getValueForName(name);
+                    setPresentsDefaultValue(false);
+                    fireValueChanged(VALUE, stringcast(oldValue), stringcast(fValue));
+                }
+            });
+        }
+        return fCombo;
+    }
+
+    /*
+     * Given the name (label) of an entry, return the corresponding value.
+     */
+    private String getValueForName(String name) {
+        for (int i = 0; i < fEntryNamesAndValues.length; i++) {
+            String[] entry = fEntryNamesAndValues[i];
+            if (name.equals(entry[0])) {
+                return entry[1];
+            }
+        }
+        return fEntryNamesAndValues[0][0];
+    }
+
+    /*
+     * Set the name in the combo widget to match the specified value.
+     */
+    private void updateComboForValue(String value) {
+        fValue = value;
+        for (int i = 0; i < fEntryNamesAndValues.length; i++) {
+            if (value.equals(fEntryNamesAndValues[i][1])) {
+                fCombo.setText(fEntryNamesAndValues[i][0]);
+                return;
+            }
+        }
+        if (fEntryNamesAndValues.length > 0) {
+            fValue = fEntryNamesAndValues[0][1];
+            fCombo.setText(fEntryNamesAndValues[0][0]);
+        }
+    }
+}