From: Niki Roo <niki@nikiroo.be>
Date: Tue, 19 Nov 2019 12:32:07 +0000 (+0100)
Subject: ConfigItem easier to extends
X-Git-Url: https://git.nikiroo.be/?a=commitdiff_plain;h=28a82bab4c068af216ac38609a8dd2c0bf2f531a;p=nikiroo-utils.git

ConfigItem easier to extends
---

diff --git a/src/be/nikiroo/utils/ui/ConfigItem.java b/src/be/nikiroo/utils/ui/ConfigItem.java
index 1f69886..3ae029e 100644
--- a/src/be/nikiroo/utils/ui/ConfigItem.java
+++ b/src/be/nikiroo/utils/ui/ConfigItem.java
@@ -9,10 +9,7 @@ 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;
@@ -93,23 +90,86 @@ public abstract class ConfigItem<E extends Enum<E>> extends JPanel {
 			+ "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 code base */
+	private final ConfigItemBase<JComponent, E> base;
 
 	/** The main panel with all the fields in it. */
 	private JPanel main;
 
-	/** The {@link MetaInfo} linked to the field. */
-	protected MetaInfo<E> info;
+	/**
+	 * 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) {
+		base = new ConfigItemBase<JComponent, E>(info, autoDirtyHandling) {
+			@Override
+			protected JComponent createEmptyField(int item) {
+				return ConfigItem.this.createEmptyField(item);
+			}
+
+			@Override
+			protected Object getFromInfo(int item) {
+				return ConfigItem.this.getFromInfo(item);
+			}
+
+			@Override
+			protected void setToInfo(Object value, int item) {
+				ConfigItem.this.setToInfo(value, item);
+			}
+
+			@Override
+			protected Object getFromField(int item) {
+				return ConfigItem.this.getFromField(item);
+			}
+
+			@Override
+			protected void setToField(Object value, int item) {
+				ConfigItem.this.setToField(value, item);
+			}
+
+			@Override
+			public JComponent createField(int item) {
+				JComponent field = super.createField(item);
+
+				int height = Math.max(getMinimumHeight(),
+						field.getMinimumSize().height);
+				field.setPreferredSize(new Dimension(200, height));
+
+				return field;
+			}
+
+			@Override
+			public List<JComponent> reload() {
+				List<JComponent> removed = base.reload();
+				if (!removed.isEmpty()) {
+					for (JComponent c : removed) {
+						main.remove(c);
+					}
+					main.revalidate();
+					main.repaint();
+				}
+
+				return removed;
+			}
+
+			@Override
+			protected JComponent removeItem(int item) {
+				JComponent removed = super.removeItem(item);
+				main.remove(removed);
+				main.revalidate();
+				main.repaint();
+
+				return removed;
+			}
+		};
+	}
 
 	/**
 	 * Create a new {@link ConfigItem} for the given {@link MetaInfo}.
@@ -121,16 +181,16 @@ public abstract class ConfigItem<E extends Enum<E>> extends JPanel {
 	 *            different horisontal position)
 	 */
 	public void init(int nhgap) {
-		if (info.isArray()) {
+		if (getInfo().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);
+			int size = getInfo().getListSize(false);
 			for (int i = 0; i < size; i++) {
-				addItem(i);
+				addItemWithMinusPanel(i);
 			}
 			main.revalidate();
 			main.repaint();
@@ -141,7 +201,7 @@ public abstract class ConfigItem<E extends Enum<E>> extends JPanel {
 			add.addActionListener(new ActionListener() {
 				@Override
 				public void actionPerformed(ActionEvent e) {
-					addItem(fields.size());
+					addItemWithMinusPanel(base.getFieldsSize());
 					main.revalidate();
 					main.repaint();
 				}
@@ -159,16 +219,74 @@ public abstract class ConfigItem<E extends Enum<E>> extends JPanel {
 			this.setLayout(new BorderLayout());
 			add(label(nhgap), BorderLayout.WEST);
 
-			JComponent field = createField(-1);
+			JComponent field = base.createField(-1);
 			add(field, BorderLayout.CENTER);
 		}
 	}
 
-	private void addItem(final int item) {
-		JPanel minusPanel = new JPanel(new BorderLayout());
-		itemFields.put(item, minusPanel);
+	/** The {@link MetaInfo} linked to the field. */
+	public MetaInfo<E> getInfo() {
+		return base.getInfo();
+	}
+
+	/**
+	 * Retrieve the associated graphical component that was created with
+	 * {@link ConfigItemBase#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) {
+		return base.getField(item);
+	}
+
+	/**
+	 * 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 ConfigItemBase#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) {
+		base.setDirtyItem(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) {
+		return base.hasValueChanged(value, item);
+	}
+
+	private void addItemWithMinusPanel(int item) {
+		JPanel minusPanel = createMinusPanel(item);
+		JComponent field = base.addItem(item, minusPanel);
+		minusPanel.add(field, BorderLayout.CENTER);
+	}
 
-		JComponent field = createField(item);
+	private JPanel createMinusPanel(final int item) {
+		JPanel minusPanel = new JPanel(new BorderLayout());
 
 		final JButton remove = new JButton();
 		setImage(remove, img64remove, "-");
@@ -176,52 +294,17 @@ public abstract class ConfigItem<E extends Enum<E>> extends JPanel {
 		remove.addActionListener(new ActionListener() {
 			@Override
 			public void actionPerformed(ActionEvent e) {
-				removeItem(item);
+				base.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>();
-		}
+		return minusPanel;
 	}
 
 	/**
@@ -291,279 +374,6 @@ public abstract class ConfigItem<E extends Enum<E>> extends JPanel {
 	 */
 	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.
 	 * 
@@ -576,7 +386,7 @@ public abstract class ConfigItem<E extends Enum<E>> extends JPanel {
 	 * @return the label
 	 */
 	protected JComponent label(int nhgap) {
-		final JLabel label = new JLabel(info.getName());
+		final JLabel label = new JLabel(getInfo().getName());
 
 		Dimension ps = label.getPreferredSize();
 		if (ps == null) {
@@ -598,7 +408,7 @@ public abstract class ConfigItem<E extends Enum<E>> extends JPanel {
 			@Override
 			public void run() {
 				StringBuilder builder = new StringBuilder();
-				String text = (info.getDescription().replace("\\n", "\n"))
+				String text = (getInfo().getDescription().replace("\\n", "\n"))
 						.trim();
 				for (String line : StringUtils.justifyText(text, 80,
 						Alignment.LEFT)) {
@@ -608,8 +418,8 @@ public abstract class ConfigItem<E extends Enum<E>> extends JPanel {
 					builder.append(line);
 				}
 				text = builder.toString();
-				JOptionPane.showMessageDialog(ConfigItem.this, text,
-						info.getName(), JOptionPane.INFORMATION_MESSAGE);
+				JOptionPane.showMessageDialog(ConfigItem.this, text, getInfo()
+						.getName(), JOptionPane.INFORMATION_MESSAGE);
 			}
 		};
 
diff --git a/src/be/nikiroo/utils/ui/ConfigItemBase.java b/src/be/nikiroo/utils/ui/ConfigItemBase.java
new file mode 100644
index 0000000..21b5755
--- /dev/null
+++ b/src/be/nikiroo/utils/ui/ConfigItemBase.java
@@ -0,0 +1,467 @@
+package be.nikiroo.utils.ui;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+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 <T>
+ *            the graphical base type to use (i.e., T or TWidget)
+ * @param <E>
+ *            the type of {@link Bundle} to edit
+ */
+public abstract class ConfigItemBase<T, E extends Enum<E>> {
+	/** 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 T field;
+	private List<T> fields = new ArrayList<T>();
+
+	/** The fields to panel map to get the actual item added to 'main'. */
+	private Map<Integer, T> itemFields = new HashMap<Integer, T>();
+
+	/** The {@link MetaInfo} linked to the field. */
+	private MetaInfo<E> info;
+
+	/** The {@link MetaInfo} linked to the field. */
+	public MetaInfo<E> getInfo() {
+		return info;
+	}
+
+	/**
+	 * The number of fields, for arrays.
+	 * 
+	 * @return
+	 */
+	public int getFieldsSize() {
+		return fields.size();
+	}
+
+	/**
+	 * The number of fields to panel map to get the actual item added to 'main'.
+	 */
+	public int getItemFieldsSize() {
+		return itemFields.size();
+	}
+
+	/**
+	 * Add a new item in an array-value {@link MetaInfo}.
+	 * 
+	 * @param item
+	 *            the index of the new item
+	 * @param panel
+	 *            a linked T, if we want to link it into the itemFields (can be
+	 *            NULL) -- that way, we can get it back later on
+	 *            {@link ConfigItemBase#removeItem(int)}
+	 * 
+	 * @return the newly created graphical field
+	 */
+	public T addItem(final int item, T panel) {
+		if (panel != null) {
+			itemFields.put(item, panel);
+		}
+		return createField(item);
+	}
+
+	/**
+	 * The counter-part to {@link ConfigItemBase#addItem(int, Object)}, to
+	 * remove a specific item of an array-values {@link MetaInfo}; all the
+	 * remaining items will be shifted as required (so, always the last
+	 * graphical object will be removed).
+	 * 
+	 * @param item
+	 *            the index of the item to remove
+	 * 
+	 * @return the linked graphical T to remove if any (always the latest
+	 *         graphical object if any)
+	 */
+	protected T 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);
+		}
+
+		return itemFields.remove(last);
+	}
+
+	/**
+	 * Prepare a new {@link ConfigItemBase} 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 ConfigItemBase#setDirtyItem(int)}
+	 */
+	protected ConfigItemBase(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 ConfigItemBase#createField(int)}.
+	 * <p>
+	 * Note that {@link ConfigItemBase#reload(int)} will be called after it was
+	 * created by {@link ConfigItemBase#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 T 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 ConfigItemBase#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, T 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 ConfigItemBase#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
+	 */
+	public T 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 ConfigItemBase#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)
+	 */
+	public 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
+	 */
+	public 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}.
+	 * 
+	 * @return for arrays, the list of graphical T objects we don't need any
+	 *         more (never NULL, but can be empty)
+	 */
+	public List<T> reload() {
+		List<T> removed = new ArrayList<T>();
+		if (info.isArray()) {
+			while (!itemFields.isEmpty()) {
+				removed.add(itemFields.remove(itemFields.size() - 1));
+			}
+			for (int item = 0; item < info.getListSize(false); item++) {
+				reload(item);
+			}
+		} else {
+			reload(-1);
+		}
+
+		return removed;
+	}
+
+	/**
+	 * 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, null);
+		}
+
+		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
+	 */
+	public T createField(final int item) {
+		T 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();
+			}
+		});
+
+		return field;
+	}
+}
diff --git a/src/be/nikiroo/utils/ui/ConfigItemBoolean.java b/src/be/nikiroo/utils/ui/ConfigItemBoolean.java
index 255ec13..de89f68 100644
--- a/src/be/nikiroo/utils/ui/ConfigItemBoolean.java
+++ b/src/be/nikiroo/utils/ui/ConfigItemBoolean.java
@@ -30,7 +30,7 @@ class ConfigItemBoolean<E extends Enum<E>> extends ConfigItem<E> {
 
 	@Override
 	protected Object getFromInfo(int item) {
-		return info.getBoolean(item, true);
+		return getInfo().getBoolean(item, true);
 	}
 
 	@Override
@@ -49,7 +49,7 @@ class ConfigItemBoolean<E extends Enum<E>> extends ConfigItem<E> {
 
 	@Override
 	protected void setToInfo(Object value, int item) {
-		info.setBoolean((Boolean) value, item);
+		getInfo().setBoolean((Boolean) value, item);
 	}
 
 	@Override
@@ -58,7 +58,8 @@ class ConfigItemBoolean<E extends Enum<E>> extends ConfigItem<E> {
 		if (getFromInfo(item) == null) {
 			System.err
 					.println("No default value given for BOOLEAN parameter \""
-							+ info.getName() + "\", we consider it is FALSE");
+							+ getInfo().getName()
+							+ "\", we consider it is FALSE");
 		}
 
 		return new JCheckBox();
diff --git a/src/be/nikiroo/utils/ui/ConfigItemBrowse.java b/src/be/nikiroo/utils/ui/ConfigItemBrowse.java
index 6c8af99..9a54e52 100644
--- a/src/be/nikiroo/utils/ui/ConfigItemBrowse.java
+++ b/src/be/nikiroo/utils/ui/ConfigItemBrowse.java
@@ -48,7 +48,7 @@ class ConfigItemBrowse<E extends Enum<E>> extends ConfigItem<E> {
 
 	@Override
 	protected Object getFromInfo(int item) {
-		String path = info.getString(item, false);
+		String path = getInfo().getString(item, false);
 		if (path != null && !path.isEmpty()) {
 			return new File(path);
 		}
@@ -66,7 +66,7 @@ class ConfigItemBrowse<E extends Enum<E>> extends ConfigItem<E> {
 
 	@Override
 	protected void setToInfo(Object value, int item) {
-		info.setString(((File) value).getPath(), item);
+		getInfo().setString(((File) value).getPath(), item);
 	}
 
 	@Override
diff --git a/src/be/nikiroo/utils/ui/ConfigItemColor.java b/src/be/nikiroo/utils/ui/ConfigItemColor.java
index 500efff..951ff45 100644
--- a/src/be/nikiroo/utils/ui/ConfigItemColor.java
+++ b/src/be/nikiroo/utils/ui/ConfigItemColor.java
@@ -49,7 +49,7 @@ class ConfigItemColor<E extends Enum<E>> extends ConfigItem<E> {
 
 	@Override
 	protected Object getFromInfo(int item) {
-		return info.getString(item, true);
+		return getInfo().getString(item, true);
 	}
 
 	@Override
@@ -67,7 +67,7 @@ class ConfigItemColor<E extends Enum<E>> extends ConfigItem<E> {
 
 	@Override
 	protected void setToInfo(Object value, int item) {
-		info.setString((String) value, item);
+		getInfo().setString((String) value, item);
 	}
 
 	/**
@@ -81,7 +81,7 @@ class ConfigItemColor<E extends Enum<E>> extends ConfigItem<E> {
 	 * @return a colour
 	 */
 	private int getFromInfoColor(int item) {
-		Integer color = info.getColor(item, true);
+		Integer color = getInfo().getColor(item, true);
 		if (color == null) {
 			return new Color(255, 255, 255, 255).getRGB();
 		}
@@ -102,11 +102,12 @@ class ConfigItemColor<E extends Enum<E>> extends ConfigItem<E> {
 				int icol = getFromInfoColor(item);
 				Color initialColor = new Color(icol, true);
 				Color newColor = JColorChooser.showDialog(ConfigItemColor.this,
-						info.getName(), initialColor);
+						getInfo().getName(), initialColor);
 				if (newColor != null) {
-					info.setColor(newColor.getRGB(), item);
-					field.setText(info.getString(item, false));
-					colorWheel.setIcon(getIcon(17, info.getColor(item, true)));
+					getInfo().setColor(newColor.getRGB(), item);
+					field.setText(getInfo().getString(item, false));
+					colorWheel.setIcon(getIcon(17,
+							getInfo().getColor(item, true)));
 				}
 			}
 		});
@@ -114,7 +115,7 @@ class ConfigItemColor<E extends Enum<E>> extends ConfigItem<E> {
 		field.addKeyListener(new KeyAdapter() {
 			@Override
 			public void keyTyped(KeyEvent e) {
-				info.setString(field.getText() + e.getKeyChar(), item);
+				getInfo().setString(field.getText() + e.getKeyChar(), item);
 				int color = getFromInfoColor(item);
 				colorWheel.setIcon(getIcon(17, color));
 			}
diff --git a/src/be/nikiroo/utils/ui/ConfigItemCombobox.java b/src/be/nikiroo/utils/ui/ConfigItemCombobox.java
index b77e0a8..07a6115 100644
--- a/src/be/nikiroo/utils/ui/ConfigItemCombobox.java
+++ b/src/be/nikiroo/utils/ui/ConfigItemCombobox.java
@@ -39,7 +39,7 @@ class ConfigItemCombobox<E extends Enum<E>> extends ConfigItem<E> {
 
 	@Override
 	protected Object getFromInfo(int item) {
-		return info.getString(item, false);
+		return getInfo().getString(item, false);
 	}
 
 	@Override
@@ -54,7 +54,7 @@ class ConfigItemCombobox<E extends Enum<E>> extends ConfigItem<E> {
 
 	@Override
 	protected void setToInfo(Object value, int item) {
-		info.setString((String) value, item);
+		getInfo().setString((String) value, item);
 	}
 
 	// rawtypes for Java 1.6 (and 1.7 ?) support
diff --git a/src/be/nikiroo/utils/ui/ConfigItemInteger.java b/src/be/nikiroo/utils/ui/ConfigItemInteger.java
index 9b838a5..10c5d9d 100644
--- a/src/be/nikiroo/utils/ui/ConfigItemInteger.java
+++ b/src/be/nikiroo/utils/ui/ConfigItemInteger.java
@@ -30,7 +30,7 @@ class ConfigItemInteger<E extends Enum<E>> extends ConfigItem<E> {
 
 	@Override
 	protected Object getFromInfo(int item) {
-		return info.getInteger(item, true);
+		return getInfo().getInteger(item, true);
 	}
 
 	@Override
@@ -43,7 +43,7 @@ class ConfigItemInteger<E extends Enum<E>> extends ConfigItem<E> {
 
 	@Override
 	protected void setToInfo(Object value, int item) {
-		info.setInteger((Integer) value, item);
+		getInfo().setInteger((Integer) value, item);
 	}
 
 	@Override
diff --git a/src/be/nikiroo/utils/ui/ConfigItemPassword.java b/src/be/nikiroo/utils/ui/ConfigItemPassword.java
index 348b78f..e8ad2f2 100644
--- a/src/be/nikiroo/utils/ui/ConfigItemPassword.java
+++ b/src/be/nikiroo/utils/ui/ConfigItemPassword.java
@@ -61,7 +61,7 @@ class ConfigItemPassword<E extends Enum<E>> extends ConfigItem<E> {
 
 	@Override
 	protected Object getFromInfo(int item) {
-		return info.getString(item, false);
+		return getInfo().getString(item, false);
 	}
 
 	@Override
@@ -74,7 +74,7 @@ class ConfigItemPassword<E extends Enum<E>> extends ConfigItem<E> {
 
 	@Override
 	protected void setToInfo(Object value, int item) {
-		info.setString((String) value, item);
+		getInfo().setString((String) value, item);
 	}
 
 	@Override
diff --git a/src/be/nikiroo/utils/ui/ConfigItemString.java b/src/be/nikiroo/utils/ui/ConfigItemString.java
index 99a8cc3..46333c0 100644
--- a/src/be/nikiroo/utils/ui/ConfigItemString.java
+++ b/src/be/nikiroo/utils/ui/ConfigItemString.java
@@ -30,7 +30,7 @@ class ConfigItemString<E extends Enum<E>> extends ConfigItem<E> {
 
 	@Override
 	protected Object getFromInfo(int item) {
-		return info.getString(item, false);
+		return getInfo().getString(item, false);
 	}
 
 	@Override
@@ -43,7 +43,7 @@ class ConfigItemString<E extends Enum<E>> extends ConfigItem<E> {
 
 	@Override
 	protected void setToInfo(Object value, int item) {
-		info.setString((String) value, item);
+		getInfo().setString((String) value, item);
 	}
 
 	@Override