From 33613a85afc4b1481367fbe92a17ee59c240250b Mon Sep 17 00:00:00 2001
From: Sven Eisenhauer <sven@sven-eisenhauer.net>
Date: Fri, 10 Nov 2023 15:11:48 +0100
Subject: add new repo

---
 .../hjp5/examples/LightedPushButton.java           | 134 +++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 Master/Reference Architectures and Patterns/hjp5/examples/LightedPushButton.java

(limited to 'Master/Reference Architectures and Patterns/hjp5/examples/LightedPushButton.java')

diff --git a/Master/Reference Architectures and Patterns/hjp5/examples/LightedPushButton.java b/Master/Reference Architectures and Patterns/hjp5/examples/LightedPushButton.java
new file mode 100644
index 0000000..1d63754
--- /dev/null
+++ b/Master/Reference Architectures and Patterns/hjp5/examples/LightedPushButton.java	
@@ -0,0 +1,134 @@
+/* LightedPushButton.java */
+
+import java.awt.*;
+import java.awt.event.*;
+import java.io.*;
+import java.beans.*;
+
+public class LightedPushButton
+extends Canvas
+implements Serializable
+{
+  //---Instanzvariablen----------------------------------------
+  protected Color                 linecolor;
+  protected Color                 framecolor;
+  protected Color                 lightoncolor;
+  protected Color                 lightoffcolor;
+  protected boolean               lighton;
+  transient protected PropertyChangeSupport pchglisteners;
+  transient protected VetoableChangeSupport vchglisteners;
+
+  //---Methoden------------------------------------------------
+  public LightedPushButton()
+  {
+    linecolor     = Color.black;
+    framecolor    = Color.darkGray;
+    lightoncolor  = Color.red;
+    lightoffcolor = new Color(127, 0, 0); //dark red
+    lighton       = false;
+    initTransientState();
+  }
+
+  //---Zustandsumschaltung Licht an/aus---
+  public void setLightOn(boolean on)
+  throws PropertyVetoException
+  {
+    boolean oldvalue = this.lighton;
+    vchglisteners.fireVetoableChange("lighton", oldvalue, on);
+    this.lighton = on;
+    if (oldvalue != on) {
+      repaint();
+    }
+    pchglisteners.firePropertyChange("lighton", oldvalue, on);
+  }
+
+  public boolean getLightOn()
+  {
+    return this.lighton;
+  }
+
+  //---Verwaltung der PropertyChangeListener---
+  public void addPropertyChangeListener(PropertyChangeListener l)
+  {
+    pchglisteners.addPropertyChangeListener(l);
+  }
+
+  public void removePropertyChangeListener(PropertyChangeListener l)
+  {
+    pchglisteners.removePropertyChangeListener(l);
+  }
+
+  //---Verwaltung der VetoableChangeListener---
+  public void addVetoableChangeListener(VetoableChangeListener l)
+  {
+    vchglisteners.addVetoableChangeListener(l);
+  }
+
+  public void removeVetoableChangeListener(VetoableChangeListener l)
+  {
+    vchglisteners.removeVetoableChangeListener(l);
+  }
+
+  //---Implementierung der Oberfläche---
+  public void paint(Graphics g)
+  {
+    int width = getSize().width;
+    int height = getSize().height;
+    //Rahmen
+    g.setColor(framecolor);
+    g.fillOval(0, 0, width, height);
+    //Beleuchtung
+    g.setColor(lighton ? lightoncolor : lightoffcolor);
+    g.fillOval(4, 4, width - 8, height - 8);
+    //Konturlinien
+    g.setColor(linecolor);
+    g.drawOval(0, 0, width - 1, height - 1);
+    g.drawOval(3, 3, width - 7, height - 7);
+  }
+
+  public Dimension getPreferredSize()
+  {
+    return new Dimension(32, 32);
+  }
+
+  public Dimension getMinimumSize()
+  {
+    return new Dimension(16, 16);
+  }
+
+  //---Private Klassen---------------------------------------
+  /**
+   * Initialisierung der nicht-persistenten Instanzvariablen.
+   */
+  private void initTransientState()
+  {
+    pchglisteners = new PropertyChangeSupport(this);
+    vchglisteners = new VetoableChangeSupport(this);
+    addMouseListener(new MouseClickAdapter());
+  }
+
+  /**
+   * Wird überlagert, um nach dem Deserialisieren den transienten
+   * Zustand zu initialisieren.
+   */
+  private void readObject(ObjectInputStream stream)
+  throws IOException, ClassNotFoundException
+  {
+    stream.defaultReadObject();
+    initTransientState();
+  }
+
+  //---Lokale Klassen----------------------------------------
+  class MouseClickAdapter
+  extends MouseAdapter
+  {
+    public void mouseClicked(MouseEvent event)
+    {
+      try {
+        setLightOn(!getLightOn());
+      } catch (PropertyVetoException e) {
+        //no change if vetoed
+      }
+    }
+  }
+}
\ No newline at end of file
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