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| author | Sven Eisenhauer <sven@sven-eisenhauer.net> | 2023-11-10 15:11:48 +0100 |
|---|---|---|
| committer | Sven Eisenhauer <sven@sven-eisenhauer.net> | 2023-11-10 15:11:48 +0100 |
| commit | 33613a85afc4b1481367fbe92a17ee59c240250b (patch) | |
| tree | 670b842326116b376b505ec2263878912fca97e2 /Master/Reference Architectures and Patterns/hjp5/examples/LightedPushButton.java | |
| download | Studium-master.tar.gz Studium-master.tar.bz2 | |
Diffstat (limited to 'Master/Reference Architectures and Patterns/hjp5/examples/LightedPushButton.java')
| -rw-r--r-- | Master/Reference Architectures and Patterns/hjp5/examples/LightedPushButton.java | 134 |
1 files changed, 134 insertions, 0 deletions
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
+ }
+ }
+ }
+}
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