10 files changed, 57 insertions, 20 deletions
diff --git a/core/src/ch/asynk/gdx/boardgame/ui/Bg.java b/core/src/ch/asynk/gdx/boardgame/ui/Bg.java
index 18cfa7c..ba0385e 100644
--- a/core/src/ch/asynk/gdx/boardgame/ui/Bg.java
+++ b/core/src/ch/asynk/gdx/boardgame/ui/Bg.java
@@ -16,7 +16,7 @@ public class Bg extends Element
     @Override public void draw(Batch batch)
     {
         if (!visible) return;
-        if (tainted) computeGeometry();
+        if (dirty) computeGeometry();
         batch.draw(region, rect.x, rect.y, rect.width, rect.height);
     }
 }
diff --git a/core/src/ch/asynk/gdx/boardgame/ui/Button.java b/core/src/ch/asynk/gdx/boardgame/ui/Button.java
index 69bec27..6798ea6 100644
--- a/core/src/ch/asynk/gdx/boardgame/ui/Button.java
+++ b/core/src/ch/asynk/gdx/boardgame/ui/Button.java
@@ -58,7 +58,7 @@ public class Button extends Patch
     @Override public void draw(Batch batch)
     {
         if (!visible) return;
-        if (tainted) computeGeometry();
+        if (dirty) computeGeometry();
         super.draw(batch);
         label.draw(batch);
     }
diff --git a/core/src/ch/asynk/gdx/boardgame/ui/Container.java b/core/src/ch/asynk/gdx/boardgame/ui/Container.java
index 79e0c45..8225d1e 100644
--- a/core/src/ch/asynk/gdx/boardgame/ui/Container.java
+++ b/core/src/ch/asynk/gdx/boardgame/ui/Container.java
@@ -24,6 +24,7 @@ public class Container extends Element
         if (children.add(e)) {
             e.setParent(this);
         }
+        taint();
     }
 
     public void remove(Element e)
@@ -32,19 +33,21 @@ public class Container extends Element
             if (children.remove(e)) {
                 e.setParent(null);
             }
+            taint();
         }
     }
 
-    public void taintChildren()
+    @Override public void drip()
     {
+        super.drip();
         if (children != null)
-            children.forEach( c -> c.taint() );
+            children.forEach( c -> c.drip() );
     }
 
     @Override public void draw(Batch batch)
     {
         if (!visible) return;
-        if (tainted) computeGeometry();
+        if (dirty) computeGeometry();
         if (children != null)
             children.forEach( c -> c.draw(batch) );
     }
diff --git a/core/src/ch/asynk/gdx/boardgame/ui/Element.java b/core/src/ch/asynk/gdx/boardgame/ui/Element.java
index 13b1d42..6d6fad1 100644
--- a/core/src/ch/asynk/gdx/boardgame/ui/Element.java
+++ b/core/src/ch/asynk/gdx/boardgame/ui/Element.java
@@ -20,7 +20,7 @@ public abstract class Element implements Drawable, Paddable, Positionable, Touch
     protected Alignment alignment;      // where to position itself
     protected Rectangle rect;           // outer drawing coordinates
     protected float x, y;               // given position
-    protected boolean tainted;          // geometry must be computed
+    protected boolean dirty;            // geometry must be computed
 
     protected Element()
     {
@@ -61,7 +61,7 @@ public abstract class Element implements Drawable, Paddable, Positionable, Touch
         String r = suffix;
         r += " : " + (int)x + " " + (int)y +
             " [" + (int)rect.x + " " + (int)rect.y + " " + (int)rect.width + " " + (int)rect.height + "] +" +
-            (int)padding + " " + alignment + " " + sizing + " "+ getClass().getName();
+            (int)padding + " " + alignment + " " + sizing + " "+ getClass().getName() + " " + Integer.toHexString(hashCode());
         if (level < 0)
             return r;
         if (parent != null)
@@ -71,10 +71,34 @@ public abstract class Element implements Drawable, Paddable, Positionable, Touch
         return r;
     }
 
+    protected void print(String msg)
+    {
+        System.err.println(msg + " : " + getClass().getName() + " " + Integer.toHexString(hashCode()));
+    }
+
+    public void clear()
+    {
+        if (DEBUG_GEOMETRY) print(" clear");
+        this.dirty = false;
+    }
+
+    public void mark()
+    {
+        if (DEBUG_GEOMETRY) print("  mark");
+        this.dirty = true;
+    }
+
+    public void drip()
+    {
+        if (DEBUG_GEOMETRY) print("  drip");
+        this.dirty = true;
+    }
+
     public void taint()
     {
-        this.tainted = true;
-        if (parent != null) parent.taint();
+        if (DEBUG_GEOMETRY) print(" taint");
+        mark();
+        if (parent != null) parent.mark();
     }
 
     @Override public void setPosition(float x, float y, float w, float h)
@@ -86,6 +110,14 @@ public abstract class Element implements Drawable, Paddable, Positionable, Touch
         taint();
     }
 
+    public final void setPositionClear(float x, float y)
+    {
+        this.x = x;
+        this.y = y;
+        computePosition();
+        clear();
+    }
+
     public void setParent(Element parent)
     {
         setParent(parent, null);
@@ -167,11 +199,11 @@ public abstract class Element implements Drawable, Paddable, Positionable, Touch
 
     public final void computeGeometry()
     {
-        if (DEBUG_GEOMETRY) System.err.println("[Geometry " + print(-1));
+        if (DEBUG_GEOMETRY) { print("[Geometry"); System.err.println("  --> " + print(-1)); }
         computeDimensions();
         computePosition();
-        if (DEBUG_GEOMETRY) System.err.println("Geometry]" + print(-1));
-        this.tainted = false;
+        clear();
+        if (DEBUG_GEOMETRY) System.err.println("Geometry]");
     }
 
     @Override public void drawDebug(ShapeRenderer shapeRenderer)
diff --git a/core/src/ch/asynk/gdx/boardgame/ui/Label.java b/core/src/ch/asynk/gdx/boardgame/ui/Label.java
index 4eb1de6..779554b 100644
--- a/core/src/ch/asynk/gdx/boardgame/ui/Label.java
+++ b/core/src/ch/asynk/gdx/boardgame/ui/Label.java
@@ -62,7 +62,7 @@ public class Label extends Element
     @Override public void draw(Batch batch)
     {
         if (!visible) return;
-        if (tainted) computeGeometry();
+        if (dirty) computeGeometry();
         font.draw(batch, layout, getInnerX(), getInnerY() + layout.height);
     }
 }
diff --git a/core/src/ch/asynk/gdx/boardgame/ui/List.java b/core/src/ch/asynk/gdx/boardgame/ui/List.java
index da1c33f..16a6aef 100644
--- a/core/src/ch/asynk/gdx/boardgame/ui/List.java
+++ b/core/src/ch/asynk/gdx/boardgame/ui/List.java
@@ -81,12 +81,13 @@ public class List extends Element
     {
         super.computePosition();
         selected.computePosition();
+        if (DEBUG_GEOMETRY) System.err.println("  pos " + print(-1));
     }
 
     @Override public void draw(Batch batch)
     {
         if (!visible) return;
-        if (tainted) computeGeometry();
+        if (dirty) computeGeometry();
         float x = getInnerX();
         float y = getInnerTop();
         for (Item e : items) {
diff --git a/core/src/ch/asynk/gdx/boardgame/ui/Menu.java b/core/src/ch/asynk/gdx/boardgame/ui/Menu.java
index e851175..be14951 100644
--- a/core/src/ch/asynk/gdx/boardgame/ui/Menu.java
+++ b/core/src/ch/asynk/gdx/boardgame/ui/Menu.java
@@ -87,12 +87,13 @@ public class Menu extends Patch
         super.computePosition();
 
         float y = getInnerHeight() - title.getHeight();
-        title.setPosition(0, y);
+        title.setPositionClear(0, y);
         y -= titleSpacing;
         for (Label l : entries) {
-            l.setPosition(x + entriesOffset, y - l.getHeight());
+            l.setPositionClear(x + entriesOffset, y - l.getHeight());
             y -= (l.getHeight() + entriesSpacing);
         }
+        if (DEBUG_GEOMETRY) System.err.println("  pos " + print(-1));
     }
 
     public int touched()
@@ -118,7 +119,7 @@ public class Menu extends Patch
     @Override public void draw(Batch batch)
     {
         if (!visible) return;
-        if (tainted) computeGeometry();
+        if (dirty) computeGeometry();
         super.draw(batch);
         title.draw(batch);
         for (Label label : entries) {
diff --git a/core/src/ch/asynk/gdx/boardgame/ui/Patch.java b/core/src/ch/asynk/gdx/boardgame/ui/Patch.java
index df2cc06..cd71bb9 100644
--- a/core/src/ch/asynk/gdx/boardgame/ui/Patch.java
+++ b/core/src/ch/asynk/gdx/boardgame/ui/Patch.java
@@ -17,7 +17,7 @@ public class Patch extends Element
     @Override public void draw(Batch batch)
     {
         if (!visible) return;
-        if (tainted) computeGeometry();
+        if (dirty) computeGeometry();
         patch.draw(batch, getX(), getY(), getWidth(), getHeight());
     }
 }
diff --git a/core/src/ch/asynk/gdx/boardgame/ui/Root.java b/core/src/ch/asynk/gdx/boardgame/ui/Root.java
index dfa8e04..f11a617 100644
--- a/core/src/ch/asynk/gdx/boardgame/ui/Root.java
+++ b/core/src/ch/asynk/gdx/boardgame/ui/Root.java
@@ -28,7 +28,7 @@ public class Root extends Container
     public void resize(float x, float y, float width, float height)
     {
         setPosition(x, y, width, height);
-        taintChildren();
+        drip();
     }
 
     public Element touched()
diff --git a/core/src/ch/asynk/gdx/boardgame/ui/Scrollable.java b/core/src/ch/asynk/gdx/boardgame/ui/Scrollable.java
index d07b3c7..abc0e27 100644
--- a/core/src/ch/asynk/gdx/boardgame/ui/Scrollable.java
+++ b/core/src/ch/asynk/gdx/boardgame/ui/Scrollable.java
@@ -93,7 +93,7 @@ public class Scrollable extends Element
     {
         rect.set(x, y, w, h);
         clip.set((x + padding), (y + padding), (w - 2 * padding), (h - 2 * padding));
-        child.setPosition(clip.x, clip.y - (child.rect.height - clip.height));
+        child.setPositionClear(clip.x, clip.y - (child.rect.height - clip.height));
         scissorIdx = Scissors.compute(scissorIdx, clip);
     }