Add 'src/be/nikiroo/utils/' from commit '46add0670fdee4bd936a13fe2448c5e20a7ffd0a'
[fanfix.git] / src / be / nikiroo / utils / ui / ConfigItem.java
diff --git a/src/be/nikiroo/utils/ui/ConfigItem.java b/src/be/nikiroo/utils/ui/ConfigItem.java
new file mode 100644 (file)
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+package be.nikiroo.utils.ui;
+
+import java.awt.BorderLayout;
+import java.awt.Cursor;
+import java.awt.Dimension;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.awt.image.BufferedImage;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import javax.swing.BoxLayout;
+import javax.swing.ImageIcon;
+import javax.swing.JButton;
+import javax.swing.JComponent;
+import javax.swing.JLabel;
+import javax.swing.JOptionPane;
+import javax.swing.JPanel;
+import javax.swing.JTextField;
+
+import be.nikiroo.utils.Image;
+import be.nikiroo.utils.StringUtils;
+import be.nikiroo.utils.StringUtils.Alignment;
+import be.nikiroo.utils.resources.Bundle;
+import be.nikiroo.utils.resources.MetaInfo;
+
+/**
+ * A graphical item that reflect a configuration option from the given
+ * {@link Bundle}.
+ * <p>
+ * This graphical item can be edited, and the result will be saved back into the
+ * linked {@link MetaInfo}; you still have to save the {@link MetaInfo} should
+ * you wish to, of course.
+ * 
+ * @author niki
+ * 
+ * @param <E>
+ *            the type of {@link Bundle} to edit
+ */
+public abstract class ConfigItem<E extends Enum<E>> extends JPanel {
+       private static final long serialVersionUID = 1L;
+
+       private static int minimumHeight = -1;
+
+       /** A small 16x16 "?" blue in PNG, base64 encoded. */
+       private static String img64info = //
+       ""
+                       + "iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABmJLR0QA/wD/AP+gvaeTAAAACXBI"
+                       + "WXMAAAsTAAALEwEAmpwYAAAAB3RJTUUH4wURFRg6IrtcdgAAATdJREFUOMvtkj8sQ1EUxr9z/71G"
+                       + "m1RDogYxq7WDDYMYTSajSG4n6YRYzSaSLibWbiaDIGwdiLIYDFKDNJEgKu969xi8UNHy7H7LPcN3"
+                       + "v/Odcy+hG9oOIeIcBCJS9MAvlZtOMtHxsrFrJHGqe0RVGnHAHpcIbPlng8BS3HmKBJYzabGUzcrJ"
+                       + "XK+ckIrqANYR2JEv2nYDEVck0WKGfHzyq82Go+btxoX3XAcAIqTj8wPqOH6mtMeM4bGCLhyfhTMA"
+                       + "qlLhKHqujCfaweCAmV0p50dPzsNpEKpK01V/n55HIvTnfDC2odKlfeYadZN/T+AqDACUsnkhqaU1"
+                       + "LRIVuX1x7ciuSWQxVIrunONrfq3dI6oh+T94Z8453vEem/HTqT8ZpFJ0qDXtGkPbAGAMeSRngQCA"
+                       + "eUvgn195AwlZWyvjtQdhAAAAAElFTkSuQmCC";
+
+       /** A small 16x16 "+" image with colours */
+       private static String img64add = //
+       ""
+                       + "iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABmJLR0QA/wD/AP+gvaeTAAAACXBI"
+                       + "WXMAAAsTAAALEwEAmpwYAAAAB3RJTUUH4wUeES0QBFvvnAAAAB1pVFh0Q29tbWVudAAAAAAAQ3Jl"
+                       + "YXRlZCB3aXRoIEdJTVBkLmUHAAACH0lEQVQ4y42Tz0sVURTHP+fMmC7CQMpH1EjgIimCsEVBEIg/"
+                       + "qIbcBAW2Uai1m/oH2rlJXLQpeRJt2gQhTO0iTTKC1I2JBf5gKCJCRPvhPOed22LmvV70Fn7hwr3c"
+                       + "+z3ne+73HCFHEClxaASRHgduA91AW369BkwDI3Foy0GkEofmACQnSxyaCyItAkMClMzYdeCAJgVP"
+                       + "tJJrPA7tVoUjNZlngXMAiRmXClfoK/Tjq09x7T6LW+8RxOVJ5+LQzgSRojm5WCEDlMrQVbjIQNtN"
+                       + "rh0d5FTzaTLBmWKgM4h0Ig4NzWseohYCJUuqx123Sx0MBpF2+MAdyWUnlqX4lf4bIDHjR+rwJJPR"
+                       + "qNCgCjDsA10lM/oKIRcO9lByCYklnG/pqQa4euQ6J5tPoKI0yD6ef33Ku40Z80R7CSJNWyZxT+Ki"
+                       + "2ytGP911hyZxQaRp1RtPPPYKD4+sGJwPrDUp7Q9Xxnj9fYrUUnaszEAwQHfrZQAerT/g7cYMiuCp"
+                       + "z8LmLI0qBqz6wLQn2v5he57FrXkAtlPH2ZZOuskCzG2+4dnnx3iSuSgCKqLAlAIjmXPiVIRsgYjU"
+                       + "usrfO0Gq7cA9jUNbBsZrmiQnac1e6n3FeBzakpf39OSBG9IPHAZwzlFoagVg5edHXn57wZed9dpA"
+                       + "C3FoYRDpf8M0AQwKwu9yubxjeA7Y72ENqlp3mOqMcwcwDPQCx8gGchV4BYzGoS1V3gL8AVA5C5/0"
+                       + "oRFoAAAAAElFTkSuQmCC";
+
+       /** A small 32x32 "-" image with colours */
+       private static String img64remove = //
+       ""
+                       + "iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABmJLR0QA/wD/AP+gvaeTAAAACXBI"
+                       + "WXMAAAsTAAALEwEAmpwYAAAAB3RJTUUH4wUeESw5X/JGsQAAAB1pVFh0Q29tbWVudAAAAAAAQ3Jl"
+                       + "YXRlZCB3aXRoIEdJTVBkLmUHAAACKUlEQVQ4y5WTO2iTYRSG3+//v/+SJrG5SSABh1JQBHFJNUNR"
+                       + "YodCLoMoTkK0YKhQtBmsl01wKVZRBwcrgosg3SwFW9Cippe0VmlpB6uYqYIaNSZtbv/lOKRx0iR9"
+                       + "4YOzvOc8vOd8wLbG4nYGAKP9tshKr3Pq0zFXORt0UzbopvUeZ2ml1/niUcIWAYBzwwqr+xgAjCSt"
+                       + "wpXjWzx105Ha+1XsMgT8U6IJfPAacyfO50OXJi3VwbtbxMbidtZ3tiClbzi/eAuCmxgai4AfNvNn"
+                       + "KJn3X5xWKgwA0lHHYud3MdDUXMcmIOMx0oGJXJCN9tuiJ98p4//DbtTk2cFKhB/OSBcMgQHVMkir"
+                       + "AqwJBhGYrIIkCQc2eJK3aewI9Crko2FIh0K1Jo0mcwmV6XFUlmfRXhK7eXuRKaRVIYdiUGKnW8Kn"
+                       + "0ia0t6/hKHJVqCcLzncQgLhtIvBfbWbZZahq+cl96AuvQLre2Mw59NUlkCwjZ6USL0uYgSj26B/X"
+                       + "oK+vtkYgMAhMRF4x5oWlPdod0UQtfUFo7YEBBKz59BEGAAtRx1xHVgzu5AYyHmMmMJHrZolhhU3t"
+                       + "05XJe7s2PJuCq9k1MgKyNjOXiBf8kWW5JDy4XKHBl2ql6+pvX8ZjzDOqrcWsFQAAE/T3H3z2GG/6"
+                       + "zhT8sfdKeehWkUQAeJ7WcH23xTz1uPBwf1hclA3mBZjPojFOIOSsVPpmN1OznfpA+Gn+2kCHqg/d"
+                       + "LhIA/AFU5d0V6gTjtQAAAABJRU5ErkJggg==";
+
+       /** The original value before current changes. */
+       private Object orig;
+       private List<Object> origs = new ArrayList<Object>();
+       private List<Integer> dirtyBits;
+
+       /** The fields (one for non-array, a list for arrays). */
+       private JComponent field;
+       private List<JComponent> fields = new ArrayList<JComponent>();
+
+       /** The fields to panel map to get the actual item added to 'main'. */
+       private Map<Integer, JComponent> itemFields = new HashMap<Integer, JComponent>();
+
+       /** The main panel with all the fields in it. */
+       private JPanel main;
+
+       /** The {@link MetaInfo} linked to the field. */
+       protected MetaInfo<E> info;
+
+       /**
+        * Create a new {@link ConfigItem} for the given {@link MetaInfo}.
+        * 
+        * @param nhgap
+        *            negative horisontal gap in pixel to use for the label, i.e.,
+        *            the step lock sized labels will start smaller by that amount
+        *            (the use case would be to align controls that start at a
+        *            different horisontal position)
+        */
+       public void init(int nhgap) {
+               if (info.isArray()) {
+                       this.setLayout(new BorderLayout());
+                       add(label(nhgap), BorderLayout.WEST);
+
+                       main = new JPanel();
+
+                       main.setLayout(new BoxLayout(main, BoxLayout.Y_AXIS));
+                       int size = info.getListSize(false);
+                       for (int i = 0; i < size; i++) {
+                               addItem(i);
+                       }
+                       main.revalidate();
+                       main.repaint();
+
+                       final JButton add = new JButton();
+                       setImage(add, img64add, "+");
+
+                       add.addActionListener(new ActionListener() {
+                               @Override
+                               public void actionPerformed(ActionEvent e) {
+                                       addItem(fields.size());
+                                       main.revalidate();
+                                       main.repaint();
+                               }
+                       });
+
+                       JPanel tmp = new JPanel(new BorderLayout());
+                       tmp.add(add, BorderLayout.WEST);
+
+                       JPanel mainPlus = new JPanel(new BorderLayout());
+                       mainPlus.add(main, BorderLayout.CENTER);
+                       mainPlus.add(tmp, BorderLayout.SOUTH);
+
+                       add(mainPlus, BorderLayout.CENTER);
+               } else {
+                       this.setLayout(new BorderLayout());
+                       add(label(nhgap), BorderLayout.WEST);
+
+                       JComponent field = createField(-1);
+                       add(field, BorderLayout.CENTER);
+               }
+       }
+
+       private void addItem(final int item) {
+               JPanel minusPanel = new JPanel(new BorderLayout());
+               itemFields.put(item, minusPanel);
+
+               JComponent field = createField(item);
+
+               final JButton remove = new JButton();
+               setImage(remove, img64remove, "-");
+
+               remove.addActionListener(new ActionListener() {
+                       @Override
+                       public void actionPerformed(ActionEvent e) {
+                               removeItem(item);
+                       }
+               });
+
+               minusPanel.add(field, BorderLayout.CENTER);
+               minusPanel.add(remove, BorderLayout.EAST);
+
+               main.add(minusPanel);
+               main.revalidate();
+               main.repaint();
+       }
+
+       private void removeItem(int item) {
+               int last = itemFields.size() - 1;
+
+               for (int i = item; i <= last; i++) {
+                       Object value = null;
+                       if (i < last) {
+                               value = getFromField(i + 1);
+                       }
+                       setToField(value, i);
+                       setToInfo(value, i);
+                       setDirtyItem(i);
+               }
+
+               main.remove(itemFields.remove(last));
+               main.revalidate();
+               main.repaint();
+       }
+
+       /**
+        * Prepare a new {@link ConfigItem} instance, linked to the given
+        * {@link MetaInfo}.
+        * 
+        * @param info
+        *            the info
+        * @param autoDirtyHandling
+        *            TRUE to automatically manage the setDirty/Save operations,
+        *            FALSE if you want to do it yourself via
+        *            {@link ConfigItem#setDirtyItem(int)}
+        */
+       protected ConfigItem(MetaInfo<E> info, boolean autoDirtyHandling) {
+               this.info = info;
+               if (!autoDirtyHandling) {
+                       dirtyBits = new ArrayList<Integer>();
+               }
+       }
+
+       /**
+        * Create an empty graphical component to be used later by
+        * {@link ConfigItem#createField(int)}.
+        * <p>
+        * Note that {@link ConfigItem#reload(int)} will be called after it was
+        * created by {@link ConfigItem#createField(int)}.
+        * 
+        * @param item
+        *            the item number to get for an array of values, or -1 to get
+        *            the whole value (has no effect if {@link MetaInfo#isArray()}
+        *            is FALSE)
+        * 
+        * @return the graphical component
+        */
+       abstract protected JComponent createEmptyField(int item);
+
+       /**
+        * Get the information from the {@link MetaInfo} in the subclass preferred
+        * format.
+        * 
+        * @param item
+        *            the item number to get for an array of values, or -1 to get
+        *            the whole value (has no effect if {@link MetaInfo#isArray()}
+        *            is FALSE)
+        * 
+        * @return the information in the subclass preferred format
+        */
+       abstract protected Object getFromInfo(int item);
+
+       /**
+        * Set the value to the {@link MetaInfo}.
+        * 
+        * @param value
+        *            the value in the subclass preferred format
+        * @param item
+        *            the item number to get for an array of values, or -1 to get
+        *            the whole value (has no effect if {@link MetaInfo#isArray()}
+        *            is FALSE)
+        */
+       abstract protected void setToInfo(Object value, int item);
+
+       /**
+        * The value present in the given item's related field in the subclass
+        * preferred format.
+        * 
+        * @param item
+        *            the item number to get for an array of values, or -1 to get
+        *            the whole value (has no effect if {@link MetaInfo#isArray()}
+        *            is FALSE)
+        * 
+        * @return the value present in the given item's related field in the
+        *         subclass preferred format
+        */
+       abstract protected Object getFromField(int item);
+
+       /**
+        * Set the value (in the subclass preferred format) into the field.
+        * 
+        * @param value
+        *            the value in the subclass preferred format
+        * @param item
+        *            the item number to get for an array of values, or -1 to get
+        *            the whole value (has no effect if {@link MetaInfo#isArray()}
+        *            is FALSE)
+        */
+       abstract protected void setToField(Object value, int item);
+
+       /**
+        * Create a new field for the given graphical component at the given index
+        * (note that the component is usually created by
+        * {@link ConfigItem#createEmptyField(int)}).
+        * 
+        * @param item
+        *            the item number to get for an array of values, or -1 to get
+        *            the whole value (has no effect if {@link MetaInfo#isArray()}
+        *            is FALSE)
+        * @param field
+        *            the graphical component
+        */
+       private void setField(int item, JComponent field) {
+               if (item < 0) {
+                       this.field = field;
+                       return;
+               }
+
+               for (int i = fields.size(); i <= item; i++) {
+                       fields.add(null);
+               }
+
+               fields.set(item, field);
+       }
+
+       /**
+        * Retrieve the associated graphical component that was created with
+        * {@link ConfigItem#createEmptyField(int)}.
+        * 
+        * @param item
+        *            the item number to get for an array of values, or -1 to get
+        *            the whole value (has no effect if {@link MetaInfo#isArray()}
+        *            is FALSE)
+        * 
+        * @return the graphical component
+        */
+       protected JComponent getField(int item) {
+               if (item < 0) {
+                       return field;
+               }
+
+               if (item < fields.size()) {
+                       return fields.get(item);
+               }
+
+               return null;
+       }
+
+       /**
+        * The original value (before any changes to the {@link MetaInfo}) for this
+        * item.
+        * 
+        * @param item
+        *            the item number to get for an array of values, or -1 to get
+        *            the whole value (has no effect if {@link MetaInfo#isArray()}
+        *            is FALSE)
+        * 
+        * @return the original value
+        */
+       private Object getOrig(int item) {
+               if (item < 0) {
+                       return orig;
+               }
+
+               if (item < origs.size()) {
+                       return origs.get(item);
+               }
+
+               return null;
+       }
+
+       /**
+        * The original value (before any changes to the {@link MetaInfo}) for this
+        * item.
+        * 
+        * @param item
+        *            the item number to get for an array of values, or -1 to get
+        *            the whole value (has no effect if {@link MetaInfo#isArray()}
+        *            is FALSE)
+        * @param value
+        *            the new original value
+        */
+       private void setOrig(Object value, int item) {
+               if (item < 0) {
+                       orig = value;
+               } else {
+                       while (item >= origs.size()) {
+                               origs.add(null);
+                       }
+
+                       origs.set(item, value);
+               }
+       }
+
+       /**
+        * Manually specify that the given item is "dirty" and thus should be saved
+        * when asked.
+        * <p>
+        * Has no effect if the class is using automatic dirty handling (see
+        * {@link ConfigItem#ConfigItem(MetaInfo, boolean)}).
+        * 
+        * @param item
+        *            the item number to get for an array of values, or -1 to get
+        *            the whole value (has no effect if {@link MetaInfo#isArray()}
+        *            is FALSE)
+        */
+       protected void setDirtyItem(int item) {
+               if (dirtyBits != null) {
+                       dirtyBits.add(item);
+               }
+       }
+
+       /**
+        * Check if the value changed since the last load/save into the linked
+        * {@link MetaInfo}.
+        * <p>
+        * Note that we consider NULL and an Empty {@link String} to be equals.
+        * 
+        * @param value
+        *            the value to test
+        * @param item
+        *            the item number to get for an array of values, or -1 to get
+        *            the whole value (has no effect if {@link MetaInfo#isArray()}
+        *            is FALSE)
+        * 
+        * @return TRUE if it has
+        */
+       protected boolean hasValueChanged(Object value, int item) {
+               // We consider "" and NULL to be equals
+               Object orig = getOrig(item);
+               if (orig == null) {
+                       orig = "";
+               }
+               return !orig.equals(value == null ? "" : value);
+       }
+
+       /**
+        * Reload the values to what they currently are in the {@link MetaInfo}.
+        */
+       private void reload() {
+               if (info.isArray()) {
+                       while (!itemFields.isEmpty()) {
+                               main.remove(itemFields.remove(itemFields.size() - 1));
+                       }
+                       main.revalidate();
+                       main.repaint();
+                       for (int item = 0; item < info.getListSize(false); item++) {
+                               reload(item);
+                       }
+               } else {
+                       reload(-1);
+               }
+       }
+
+       /**
+        * Reload the values to what they currently are in the {@link MetaInfo}.
+        * 
+        * @param item
+        *            the item number to get for an array of values, or -1 to get
+        *            the whole value (has no effect if {@link MetaInfo#isArray()}
+        *            is FALSE)
+        */
+       private void reload(int item) {
+               if (item >= 0 && !itemFields.containsKey(item)) {
+                       addItem(item);
+               }
+
+               Object value = getFromInfo(item);
+               setToField(value, item);
+               setOrig(value == null ? "" : value, item);
+       }
+
+       /**
+        * If the item has been modified, set the {@link MetaInfo} to dirty then
+        * modify it to, reflect the changes so it can be saved later.
+        * <p>
+        * This method does <b>not</b> call {@link MetaInfo#save(boolean)}.
+        */
+       private void save() {
+               if (info.isArray()) {
+                       boolean dirty = itemFields.size() != info.getListSize(false);
+                       for (int item = 0; item < itemFields.size(); item++) {
+                               if (getDirtyBit(item)) {
+                                       dirty = true;
+                               }
+                       }
+
+                       if (dirty) {
+                               info.setDirty();
+                               info.setString(null, -1);
+
+                               for (int item = 0; item < itemFields.size(); item++) {
+                                       Object value = null;
+                                       if (getField(item) != null) {
+                                               value = getFromField(item);
+                                               if ("".equals(value)) {
+                                                       value = null;
+                                               }
+                                       }
+
+                                       setToInfo(value, item);
+                                       setOrig(value, item);
+                               }
+                       }
+               } else {
+                       if (getDirtyBit(-1)) {
+                               Object value = getFromField(-1);
+
+                               info.setDirty();
+                               setToInfo(value, -1);
+                               setOrig(value, -1);
+                       }
+               }
+       }
+
+       /**
+        * Check if the item is dirty, and clear the dirty bit if set.
+        * 
+        * @param item
+        *            the item number to get for an array of values, or -1 to get
+        *            the whole value (has no effect if {@link MetaInfo#isArray()}
+        *            is FALSE)
+        * 
+        * @return TRUE if it was dirty, FALSE if not
+        */
+       private boolean getDirtyBit(int item) {
+               if (dirtyBits != null) {
+                       return dirtyBits.remove((Integer) item);
+               }
+
+               Object value = null;
+               if (getField(item) != null) {
+                       value = getFromField(item);
+               }
+
+               return hasValueChanged(value, item);
+       }
+
+       /**
+        * Create a new field for the given item.
+        * 
+        * @param item
+        *            the item number to get for an array of values, or -1 to get
+        *            the whole value (has no effect if {@link MetaInfo#isArray()}
+        *            is FALSE)
+        * 
+        * @return the newly created field
+        */
+       protected JComponent createField(final int item) {
+               JComponent field = createEmptyField(item);
+               setField(item, field);
+               reload(item);
+
+               info.addReloadedListener(new Runnable() {
+                       @Override
+                       public void run() {
+                               reload();
+                       }
+               });
+               info.addSaveListener(new Runnable() {
+                       @Override
+                       public void run() {
+                               save();
+                       }
+               });
+
+               int height = Math
+                               .max(getMinimumHeight(), field.getMinimumSize().height);
+               field.setPreferredSize(new Dimension(200, height));
+
+               return field;
+       }
+
+       /**
+        * Create a label which width is constrained in lock steps.
+        * 
+        * @param nhgap
+        *            negative horisontal gap in pixel to use for the label, i.e.,
+        *            the step lock sized labels will start smaller by that amount
+        *            (the use case would be to align controls that start at a
+        *            different horisontal position)
+        * 
+        * @return the label
+        */
+       protected JComponent label(int nhgap) {
+               final JLabel label = new JLabel(info.getName());
+
+               Dimension ps = label.getPreferredSize();
+               if (ps == null) {
+                       ps = label.getSize();
+               }
+
+               ps.height = Math.max(ps.height, getMinimumHeight());
+
+               int w = ps.width;
+               int step = 150;
+               for (int i = 2 * step - nhgap; i < 10 * step; i += step) {
+                       if (w < i) {
+                               w = i;
+                               break;
+                       }
+               }
+
+               final Runnable showInfo = new Runnable() {
+                       @Override
+                       public void run() {
+                               StringBuilder builder = new StringBuilder();
+                               String text = (info.getDescription().replace("\\n", "\n"))
+                                               .trim();
+                               for (String line : StringUtils.justifyText(text, 80,
+                                               Alignment.LEFT)) {
+                                       if (builder.length() > 0) {
+                                               builder.append("\n");
+                                       }
+                                       builder.append(line);
+                               }
+                               text = builder.toString();
+                               JOptionPane.showMessageDialog(ConfigItem.this, text,
+                                               info.getName(), JOptionPane.INFORMATION_MESSAGE);
+                       }
+               };
+
+               JLabel help = new JLabel("");
+               help.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
+               setImage(help, img64info, "?");
+
+               help.addMouseListener(new MouseAdapter() {
+                       @Override
+                       public void mouseClicked(MouseEvent e) {
+                               showInfo.run();
+                       }
+               });
+
+               JPanel pane2 = new JPanel(new BorderLayout());
+               pane2.add(help, BorderLayout.WEST);
+               pane2.add(new JLabel(" "), BorderLayout.CENTER);
+
+               JPanel contentPane = new JPanel(new BorderLayout());
+               contentPane.add(label, BorderLayout.WEST);
+               contentPane.add(pane2, BorderLayout.CENTER);
+
+               ps.width = w + 30; // 30 for the (?) sign
+               contentPane.setSize(ps);
+               contentPane.setPreferredSize(ps);
+
+               JPanel pane = new JPanel(new BorderLayout());
+               pane.add(contentPane, BorderLayout.NORTH);
+
+               return pane;
+       }
+
+       /**
+        * Create a new {@link ConfigItem} for the given {@link MetaInfo}.
+        * 
+        * @param <E>
+        *            the type of {@link Bundle} to edit
+        * 
+        * @param info
+        *            the {@link MetaInfo}
+        * @param nhgap
+        *            negative horisontal gap in pixel to use for the label, i.e.,
+        *            the step lock sized labels will start smaller by that amount
+        *            (the use case would be to align controls that start at a
+        *            different horisontal position)
+        * 
+        * @return the new {@link ConfigItem}
+        */
+       static public <E extends Enum<E>> ConfigItem<E> createItem(
+                       MetaInfo<E> info, int nhgap) {
+
+               ConfigItem<E> configItem;
+               switch (info.getFormat()) {
+               case BOOLEAN:
+                       configItem = new ConfigItemBoolean<E>(info);
+                       break;
+               case COLOR:
+                       configItem = new ConfigItemColor<E>(info);
+                       break;
+               case FILE:
+                       configItem = new ConfigItemBrowse<E>(info, false);
+                       break;
+               case DIRECTORY:
+                       configItem = new ConfigItemBrowse<E>(info, true);
+                       break;
+               case COMBO_LIST:
+                       configItem = new ConfigItemCombobox<E>(info, true);
+                       break;
+               case FIXED_LIST:
+                       configItem = new ConfigItemCombobox<E>(info, false);
+                       break;
+               case INT:
+                       configItem = new ConfigItemInteger<E>(info);
+                       break;
+               case PASSWORD:
+                       configItem = new ConfigItemPassword<E>(info);
+                       break;
+               case LOCALE:
+                       configItem = new ConfigItemLocale<E>(info);
+                       break;
+               case STRING:
+               default:
+                       configItem = new ConfigItemString<E>(info);
+                       break;
+               }
+
+               configItem.init(nhgap);
+               return configItem;
+       }
+
+       /**
+        * Set an image to the given {@link JButton}, with a fallback text if it
+        * fails.
+        * 
+        * @param button
+        *            the button to set
+        * @param image64
+        *            the image in BASE64 (should be PNG or similar)
+        * @param fallbackText
+        *            text to use in case the image cannot be created
+        */
+       static protected void setImage(JLabel button, String image64,
+                       String fallbackText) {
+               try {
+                       Image img = new Image(image64);
+                       try {
+                               BufferedImage bImg = ImageUtilsAwt.fromImage(img);
+                               button.setIcon(new ImageIcon(bImg));
+                       } finally {
+                               img.close();
+                       }
+               } catch (IOException e) {
+                       // This is an hard-coded image, should not happen
+                       button.setText(fallbackText);
+               }
+       }
+
+       /**
+        * Set an image to the given {@link JButton}, with a fallback text if it
+        * fails.
+        * 
+        * @param button
+        *            the button to set
+        * @param image64
+        *            the image in BASE64 (should be PNG or similar)
+        * @param fallbackText
+        *            text to use in case the image cannot be created
+        */
+       static protected void setImage(JButton button, String image64,
+                       String fallbackText) {
+               try {
+                       Image img = new Image(image64);
+                       try {
+                               BufferedImage bImg = ImageUtilsAwt.fromImage(img);
+                               button.setIcon(new ImageIcon(bImg));
+                       } finally {
+                               img.close();
+                       }
+               } catch (IOException e) {
+                       // This is an hard-coded image, should not happen
+                       button.setText(fallbackText);
+               }
+       }
+
+       static private int getMinimumHeight() {
+               if (minimumHeight < 0) {
+                       minimumHeight = new JTextField("Test").getMinimumSize().height;
+               }
+
+               return minimumHeight;
+       }
+}