added new tiles and actions:

* Tile displaying text
* TextDisplay: an action that sends text to clients
* DetermineTrainInBlock: action that alters the context by requesting the train in a specific block

src/main/java/de/srsoftware/web4rail/tiles/Block.java

@@ -304,7 +304,7 @@ public abstract class Block extends StretchableTile implements Comparable<Block>
 		return this;
 	}
 	
-	public static Tag selector(Block preselected,Collection<Block> exclude) {
+	public static Select selector(Block preselected,Collection<Block> exclude) {
 		if (isNull(exclude)) exclude = new Vector<Block>();
 		Select select = new Select(Block.class.getSimpleName());
 		new Tag("option").attr("value","0").content(t("unset")).addTo(select);

src/main/java/de/srsoftware/web4rail/tiles/Contact.java

@@ -204,7 +204,7 @@ public class Contact extends Tile{
 		return trigger;
 	}
 	
-	public void trigger(int duration) throws IOException {
+	public boolean trigger(int duration) throws IOException {
 		activate(true);
 		new Thread() {
 			public void run() {
@@ -214,6 +214,7 @@ public class Contact extends Tile{
 				} catch (Exception e) {}
 			}
 		}.start();
+		return true;
 	}
 	@Override
 	public Tile update(HashMap<String, String> params) throws IOException {

src/main/java/de/srsoftware/web4rail/tiles/TextDisplay.java

@@ -0,0 +1,75 @@
+package de.srsoftware.web4rail.tiles;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Map.Entry;
+
+import org.json.JSONObject;
+
+import de.srsoftware.tools.Tag;
+import de.srsoftware.web4rail.tags.Form;
+import de.srsoftware.web4rail.tags.Input;
+import de.srsoftware.web4rail.tags.Label;
+
+public class TextDisplay extends StretchableTile {
+	private static final String TEXT = "text";
+	private String text = "Hello, world!";
+	
+	@Override
+	public JSONObject json() {
+		return super.json().put(TEXT, text);
+	}
+	
+	@Override
+	protected Tile load(JSONObject json) throws IOException {
+		super.load(json);
+		if (json.has(TEXT))	text = json.getString(TEXT);
+		return this;
+	}
+	
+	@Override
+	public Tag tag(Map<String, Object> replacements) throws IOException {
+		if (isNull(replacements)) replacements = new HashMap<String, Object>();
+		replacements.put("%text%",text);
+		return super.tag(replacements);
+	}
+	
+	@Override
+	public Form propForm(String id) {
+		noTrack();
+		Form form = super.propForm(id);
+		new Tag("h4").content(t("Text")).addTo(form);
+		
+		new Input(TEXT, text).addTo(new Label(t("Text")+":"+NBSP)).addTo(new Tag("p")).addTo(form);
+		
+		return form;
+	}
+
+	@Override
+	protected String stretchType() {
+		return t("Width");
+	}
+
+	public TextDisplay text(String tx) {
+		text = tx;
+		return this;
+	}
+	
+	@Override
+	public Tile update(HashMap<String, String> params) throws IOException {
+		for (Entry<String, String> entry : params.entrySet()) {
+			switch (entry.getKey()) {
+				case TEXT:
+					text(entry.getValue());
+					break;
+			}
+		}
+		return super.update(params);
+	}
+	
+	@Override
+	public int width() {
+		return stretch;
+	}
+}

src/main/java/de/srsoftware/web4rail/tiles/Tile.java

@@ -58,6 +58,7 @@ public abstract class Tile extends BaseClass{
 	private   static final String Y          = "y";
 	
 	private   boolean         disabled  = false;
+	private   boolean         isTrack   = true;
 	private   int             length    = DEFAUT_LENGTH;
 	protected Direction       oneWay    = null;
 	protected Route           route     = null;
@@ -142,7 +143,7 @@ public abstract class Tile extends BaseClass{
 	}
 	
 	public Tile length(int newLength) {
-		length = newLength;
+		length = Math.max(0, newLength);
 		return this;
 	}
 	
@@ -187,6 +188,10 @@ public abstract class Tile extends BaseClass{
 		if (json.has(ONEW_WAY))    oneWay    = Direction.valueOf(json.getString(ONEW_WAY));
 		return this;
 	}
+	
+	protected void noTrack() {
+		isTrack  = false;
+	}
 		
 	public Tile position(int x, int y) {
 		this.x = x;
@@ -242,12 +247,14 @@ public abstract class Tile extends BaseClass{
 		if (isSet(route)) link("p",Map.of(REALM,REALM_ROUTE,ID,route.id(),ACTION,ACTION_PROPS),t("Locked by {}",route)).addTo(window);
 
 		Form form = propForm("tile-properties-"+id());
-		new Tag("h4").content(t("Length")).addTo(form);
-		new Input(LENGTH,length).numeric().addTo(new Label(t("Length")+":"+NBSP)).addTo(form);
-		new Tag("h4").content(t("Availability")).addTo(form);
-		Checkbox cb = new Checkbox(DISABLED, t("disabled"), disabled);
-		if (disabled) cb.clazz("disabled");
-		cb.addTo(form);
+		if (isTrack) {
+			new Tag("h4").content(t("Length")).addTo(form);		
+			new Input(LENGTH,length).numeric().addTo(new Label(t("Length")+":"+NBSP)).addTo(form);
+			new Tag("h4").content(t("Availability")).addTo(form);
+			Checkbox cb = new Checkbox(DISABLED, t("disabled"), disabled);
+			if (disabled) cb.clazz("disabled");
+			cb.addTo(form);
+		}
 		new Button(t("Apply"),form).addTo(form);
 		form.addTo(window);