1 files changed, 134 insertions, 0 deletions
diff --git a/src/Java/binnie/craftgui/controls/scroll/ControlScrollableContent.java b/src/Java/binnie/craftgui/controls/scroll/ControlScrollableContent.java
new file mode 100644
index 0000000000..442c9d3226
--- /dev/null
+++ b/src/Java/binnie/craftgui/controls/scroll/ControlScrollableContent.java
@@ -0,0 +1,134 @@
+package binnie.craftgui.controls.scroll;
+
+import binnie.craftgui.controls.core.Control;
+import binnie.craftgui.core.IWidget;
+import binnie.craftgui.core.geometry.IArea;
+import binnie.craftgui.core.geometry.IPoint;
+import binnie.craftgui.events.EventMouse.Wheel;
+import binnie.craftgui.events.EventMouse.Wheel.Handler;
+import binnie.craftgui.events.EventWidget.ChangeSize;
+import binnie.craftgui.events.EventWidget.ChangeSize.Handler;
+
+public class ControlScrollableContent<T extends IWidget>
+  extends Control
+  implements IControlScrollable
+{
+  protected T controlChild;
+  protected float scrollBarSize;
+  
+  public ControlScrollableContent(IWidget parent, float x, float y, float w, float h, float scrollBarSize)
+  {
+    super(parent, x, y, w, h);
+    if (scrollBarSize != 0.0F) {
+      new ControlScroll(this, getSize().x() - scrollBarSize, 0.0F, scrollBarSize, getSize().y(), this);
+    }
+    addEventHandler(new EventMouse.Wheel.Handler()
+    {
+      public void onEvent(EventMouse.Wheel event)
+      {
+        if ((ControlScrollableContent.this.getRelativeMousePosition().x() > 0.0F) && (ControlScrollableContent.this.getRelativeMousePosition().y() > 0.0F) && (ControlScrollableContent.this.getRelativeMousePosition().x() < ControlScrollableContent.this.getSize().x()) && (ControlScrollableContent.this.getRelativeMousePosition().y() < ControlScrollableContent.this.getSize().y()))
+        {
+          if (ControlScrollableContent.this.getMovementRange() == 0.0F) {
+            return;
+          }
+          float percentageMove = 0.8F / ControlScrollableContent.this.getMovementRange();
+          ControlScrollableContent.this.movePercentage(percentageMove * -event.getDWheel());
+        }
+      }
+    });
+    this.scrollBarSize = scrollBarSize;
+  }
+  
+  public void setScrollableContent(T child)
+  {
+    this.controlChild = child;
+    if (child == null) {
+      return;
+    }
+    child.setCroppedZone(this, new IArea(1.0F, 1.0F, getSize().x() - 2.0F - this.scrollBarSize, getSize().y() - 2.0F));
+    child.addSelfEventHandler(new EventWidget.ChangeSize.Handler()
+    {
+      public void onEvent(EventWidget.ChangeSize event)
+      {
+        ControlScrollableContent.this.controlChild.setOffset(new IPoint(0.0F, -ControlScrollableContent.this.percentageIndex * ControlScrollableContent.this.getMovementRange()));
+        if (ControlScrollableContent.this.getMovementRange() == 0.0F) {
+          ControlScrollableContent.this.percentageIndex = 0.0F;
+        }
+      }
+    });
+  }
+  
+  public T getContent()
+  {
+    return this.controlChild;
+  }
+  
+  public float getPercentageShown()
+  {
+    if ((this.controlChild == null) || (this.controlChild.getSize().y() == 0.0F)) {
+      return 1.0F;
+    }
+    float shown = getSize().y() / this.controlChild.getSize().y();
+    return Math.min(shown, 1.0F);
+  }
+  
+  float percentageIndex = 0.0F;
+  
+  public float getPercentageIndex()
+  {
+    return this.percentageIndex;
+  }
+  
+  public void movePercentage(float percentage)
+  {
+    if (this.controlChild == null) {
+      return;
+    }
+    this.percentageIndex += percentage;
+    if (this.percentageIndex > 1.0F) {
+      this.percentageIndex = 1.0F;
+    } else if (this.percentageIndex < 0.0F) {
+      this.percentageIndex = 0.0F;
+    }
+    if (getMovementRange() == 0.0F) {
+      this.percentageIndex = 0.0F;
+    }
+    this.controlChild.setOffset(new IPoint(0.0F, -this.percentageIndex * getMovementRange()));
+  }
+  
+  public void setPercentageIndex(float index)
+  {
+    movePercentage(index - this.percentageIndex);
+  }
+  
+  public float getMovementRange()
+  {
+    if (this.controlChild == null) {
+      return 0.0F;
+    }
+    float range = this.controlChild.getSize().y() - getSize().y();
+    return Math.max(range, 0.0F);
+  }
+  
+  public void onUpdateClient()
+  {
+    setPercentageIndex(getPercentageIndex());
+  }
+  
+  public void ensureVisible(float minY, float maxY, float totalY)
+  {
+    minY /= totalY;
+    maxY /= totalY;
+    
+    float shownPercentage = getPercentageShown();
+    float percentageIndex = getPercentageIndex();
+    float minPercent = (1.0F - shownPercentage) * percentageIndex;
+    float maxPercent = minPercent + shownPercentage;
+    if (maxY > maxPercent) {
+      setPercentageIndex((maxY - shownPercentage) / (1.0F - shownPercentage));
+    }
+    if (minY < minPercent) {
+      setPercentageIndex(minY / (1.0F - shownPercentage));
+    }
+  }
+}