4 files changed, 14 insertions, 11 deletions
diff --git a/core/src/ch/asynk/gdx/boardgame/ui/Button.java b/core/src/ch/asynk/gdx/boardgame/ui/Button.java
index 9bc1149..2b1638b 100644
--- a/core/src/ch/asynk/gdx/boardgame/ui/Button.java
+++ b/core/src/ch/asynk/gdx/boardgame/ui/Button.java
@@ -33,7 +33,7 @@ public class Button extends Patch
     public void write(String text)
     {
         label.write(text);
-        this.tainted = true;    // might impact Button's geometry
+        taint();    // might impact Button's geometry
     }
 
     public void setLabelAlignment(Alignment alignment)
diff --git a/core/src/ch/asynk/gdx/boardgame/ui/Element.java b/core/src/ch/asynk/gdx/boardgame/ui/Element.java
index abefdd5..e1f9850 100644
--- a/core/src/ch/asynk/gdx/boardgame/ui/Element.java
+++ b/core/src/ch/asynk/gdx/boardgame/ui/Element.java
@@ -18,6 +18,7 @@ public abstract class Element implements Drawable, Paddable, Positionable, Touch
     protected Rectangle rect;           // outer drawing coordinates
     protected float x, y;               // given position
     protected boolean tainted;          // geometry must be computed
+    protected boolean taintParent;      // propagate tainted state up the tree
 
     protected Element()
     {
@@ -29,6 +30,7 @@ public abstract class Element implements Drawable, Paddable, Positionable, Touch
         this.rect = new Rectangle(0, 0, 0, 0);
         this.x = this.y = 0;
         this.tainted = true;
+        this.taintParent= false;
     }
 
     @Override public final float getX()        { return rect.x; }
@@ -55,6 +57,7 @@ public abstract class Element implements Drawable, Paddable, Positionable, Touch
     public void taint()
     {
         this.tainted = true;
+        if (parent != null && taintParent) parent.taint();
     }
 
     @Override public void setPosition(float x, float y, float w, float h)
@@ -63,26 +66,26 @@ public abstract class Element implements Drawable, Paddable, Positionable, Touch
         this.y = y;
         this.rect.width = w;
         this.rect.height = h;
-        this.tainted = true;
+        taint();
         // rect.(x,y) will be set in computeGeometry
     }
 
     public void setParent(Element parent)
     {
         this.parent = parent;
-        this.tainted = true;
+        taint();
     }
 
     @Override public void setPadding(float padding)
     {
         this.padding = padding;
-        this.tainted = true;
+        taint();
     }
 
     public void setAlignment(Alignment alignment)
     {
         this.alignment = alignment;
-        this.tainted = true;
+        taint();
     }
 
     @Override public final void centerOn(float cx, float cy)
diff --git a/core/src/ch/asynk/gdx/boardgame/ui/Label.java b/core/src/ch/asynk/gdx/boardgame/ui/Label.java
index 32ae814..68701ce 100644
--- a/core/src/ch/asynk/gdx/boardgame/ui/Label.java
+++ b/core/src/ch/asynk/gdx/boardgame/ui/Label.java
@@ -40,7 +40,7 @@ public class Label extends Element
     {
         this.text = text;
         this.layout.setText(font, (text == null) ? "" : text);
-        this.tainted = true;
+        taint();
     }
 
     @Override protected void computeGeometry()
diff --git a/core/src/ch/asynk/gdx/boardgame/ui/Menu.java b/core/src/ch/asynk/gdx/boardgame/ui/Menu.java
index aa62483..68f65c5 100644
--- a/core/src/ch/asynk/gdx/boardgame/ui/Menu.java
+++ b/core/src/ch/asynk/gdx/boardgame/ui/Menu.java
@@ -26,7 +26,7 @@ public class Menu extends Patch
     {
         this.title = new Label(font);
         this.title.write(title);
-        this.tainted = true;
+        taint();
     }
 
     public void setEntries(BitmapFont font, String[] entries)
@@ -37,13 +37,13 @@ public class Menu extends Patch
             l.write(entries[i]);
             this.entries[i] = l;
         }
-        this.tainted = true;
+        taint();
     }
 
     public void setLabelsOffset(int entriesOffset)
     {
         this.entriesOffset = entriesOffset;
-        this.tainted = true;
+        taint();
     }
 
     public void setPaddings(int titlePadding, int labelPadding)
@@ -52,14 +52,14 @@ public class Menu extends Patch
         for (Label label : entries) {
             label.setPadding(labelPadding);
         }
-        this.tainted = true;
+        taint();
     }
 
     public void setSpacings(int titleSpacing, int entriesSpacing)
     {
         this.titleSpacing = titleSpacing;
         this.entriesSpacing = entriesSpacing;
-        this.tainted = true;
+        taint();
     }
 
     @Override public void computeGeometry()