From 059163730f6256dca467d78eb505491dc5e9601a Mon Sep 17 00:00:00 2001
From: Harald Wolff <haraldwolff@Haralds-iMac.local>
Date: Mon, 12 Feb 2018 16:38:07 +0100
Subject: [PATCH] ComboBoxHistoryModel

---
 src/org/hwo/models/ComboBoxHistoryModel.java | 126 +++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 src/org/hwo/models/ComboBoxHistoryModel.java

diff --git a/src/org/hwo/models/ComboBoxHistoryModel.java b/src/org/hwo/models/ComboBoxHistoryModel.java
new file mode 100644
index 0000000..f7ccad6
--- /dev/null
+++ b/src/org/hwo/models/ComboBoxHistoryModel.java
@@ -0,0 +1,126 @@
+package org.hwo.models;
+
+import java.util.Arrays;
+import java.util.LinkedList;
+
+import javax.swing.ComboBoxModel;
+import javax.swing.event.ListDataEvent;
+import javax.swing.event.ListDataListener;
+
+public class ComboBoxHistoryModel<E> implements ComboBoxModel<E> {
+
+	private LinkedList<ListDataListener> listDataListeners = new LinkedList();
+	private LinkedList<E> items = new LinkedList();
+	
+	private E selectedItem;
+	private int historySize;
+	
+	
+	public ComboBoxHistoryModel()
+	{
+		this.selectedItem = null;
+		this.historySize = 10;
+	}
+	public ComboBoxHistoryModel(int historySize)
+	{
+		this.selectedItem = null;
+		this.historySize = historySize;
+	}
+	
+	
+	private void fireContentsChanged()
+	{
+		ListDataEvent lde = new ListDataEvent(this, ListDataEvent.CONTENTS_CHANGED, 0, this.items.size());
+		for (ListDataListener l: listDataListeners) {
+			l.contentsChanged(lde);
+		}
+	}
+	
+	@Override
+	public void addListDataListener(ListDataListener arg0) {
+		listDataListeners.add(arg0);
+	}
+
+	@Override
+	public E getElementAt(int arg0) {
+		return items.get(arg0);
+	}
+
+	@Override
+	public int getSize() {
+		return items.size();
+	}
+
+	@Override
+	public void removeListDataListener(ListDataListener arg0) {
+		listDataListeners.remove(arg0);		
+	}
+
+	@Override
+	public Object getSelectedItem() {
+		return selectedItem;
+	}
+
+	@Override
+	public void setSelectedItem(Object arg0) {
+		selectedItem = (E)arg0;
+		if (items.contains(selectedItem)) {
+			items.remove(selectedItem);
+		}
+		items.add(0,selectedItem);
+		clampHistory();
+	}
+
+	public int getHistorySize() {
+		return historySize;
+	}
+
+	public void setHistorySize(int historySize) {
+		this.historySize = historySize;
+	}
+	
+	public Object[] getItems(){
+		return items.toArray();
+	}
+	
+	public E[] getItems(E[] at) {
+		return items.toArray(at);
+	}
+	
+	public void setItems(E[] items) {
+		this.items.clear();
+		this.items.addAll(Arrays.asList(items));
+		if (!this.items.contains(selectedItem)) {
+			selectedItem = null;
+		}
+		if (!clampHistory())
+			fireContentsChanged();
+	}
+
+	private boolean clampHistory() {
+		if (items.size() > historySize) {
+			while (items.size() > historySize) {
+				items.removeLast();
+			}
+			fireContentsChanged();
+			return true;
+		}
+		return false;
+	}
+	
+	public void addElement(E element) {
+		this.items.add(0,element);
+		if (!clampHistory())
+			fireContentsChanged();
+	}
+	
+	public void clear() {
+		items.clear();
+		fireContentsChanged();
+	}
+
+	public boolean contains(E val) {
+		return items.contains(val);
+	}
+	
+}