diff options
| 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/VetoSwitch.java | |
| download | Studium-master.tar.gz Studium-master.tar.bz2 | |
Diffstat (limited to 'Master/Reference Architectures and Patterns/hjp5/examples/VetoSwitch.java')
| -rw-r--r-- | Master/Reference Architectures and Patterns/hjp5/examples/VetoSwitch.java | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/Master/Reference Architectures and Patterns/hjp5/examples/VetoSwitch.java b/Master/Reference Architectures and Patterns/hjp5/examples/VetoSwitch.java new file mode 100644 index 0000000..ddc8a87 --- /dev/null +++ b/Master/Reference Architectures and Patterns/hjp5/examples/VetoSwitch.java @@ -0,0 +1,114 @@ +/* VetoSwitch.java */
+
+import java.awt.*;
+import java.awt.event.*;
+import java.io.*;
+import java.beans.*;
+
+public class VetoSwitch
+extends Canvas
+implements Serializable, VetoableChangeListener
+{
+ //---Instanzvariablen----------------------------------------
+ protected Color linecolor;
+ protected boolean vetoallchanges;
+
+ //---Methoden------------------------------------------------
+ public VetoSwitch()
+ {
+ this.linecolor = Color.black;
+ this.vetoallchanges = false;
+ initTransientState();
+ }
+
+ //---Konturenfarbe---
+ public void setLineColor(Color color)
+ {
+ this.linecolor = color;
+ }
+
+ public Color getLineColor()
+ {
+ return this.linecolor;
+ }
+
+ //---Zustandsumschaltung Licht an/aus---
+ public void setVetoAllChanges(boolean b)
+ {
+ if (this.vetoallchanges != b) {
+ this.vetoallchanges = b;
+ repaint();
+ }
+ }
+
+ public boolean getVetoAllChanges()
+ {
+ return this.vetoallchanges;
+ }
+
+ //---Veto---
+ public void vetoableChange(PropertyChangeEvent e)
+ throws PropertyVetoException
+ {
+ if (this.vetoallchanges) {
+ throw new PropertyVetoException("!!!VETO!!!", e);
+ }
+ }
+
+ //---Implementierung der Oberfläche---
+ public void paint(Graphics g)
+ {
+ int width = getSize().width;
+ int height = getSize().height;
+ g.setColor(linecolor);
+ g.drawRect(0, 0, width - 1, height - 1);
+ g.drawLine(width * 1 / 8, height / 2, width * 3 / 8, height / 2);
+ g.drawLine(width * 5 / 8, height / 2, width * 7 / 8, height / 2);
+ g.fillRect(width * 3 / 8 - 1, height / 2 - 1, 3, 3);
+ g.fillRect(width * 5 / 8 - 1, height / 2 - 1, 3, 3);
+ if (this.vetoallchanges) {
+ //draw open connection
+ g.drawLine(width * 3 / 8, height / 2, width * 5 / 8, height / 4);
+ } else {
+ //draw short-cutted connection
+ g.drawLine(width * 3 / 8, height / 2, width * 5 / 8, height / 2);
+ }
+ }
+
+ public Dimension getPreferredSize()
+ {
+ return new Dimension(60, 20);
+ }
+
+ public Dimension getMinimumSize()
+ {
+ return new Dimension(28, 10);
+ }
+
+ //---Private Klassen----------------------------------------
+ private void initTransientState()
+ {
+ 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)
+ {
+ setVetoAllChanges(!getVetoAllChanges());
+ }
+ }
+}
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