added missing key class for bug 2115 (SplitLayoutPanelWithBetterDraggers.java)

java/com.sap.sailing.gwt.ui/src/main/java/com/sap/sailing/gwt/ui/raceboard/SplitLayoutPanelWithBetterDraggers.java

@@ -0,0 +1,66 @@
+package com.sap.sailing.gwt.ui.raceboard;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import com.google.gwt.dom.client.Element;
+import com.google.gwt.dom.client.Style.Overflow;
+import com.google.gwt.user.client.ui.DockLayoutPanel;
+import com.google.gwt.user.client.ui.SplitLayoutPanel;
+import com.google.gwt.user.client.ui.Widget;
+
+public class SplitLayoutPanelWithBetterDraggers extends SplitLayoutPanel {
+    protected SplitLayoutPanelWithBetterDraggers() {
+        super();
+    }
+
+    protected SplitLayoutPanelWithBetterDraggers(int splitterSize) {
+        super(splitterSize);
+    }
+
+    @Override
+    public void insert(Widget child, Direction direction, double size, Widget before) {
+        Set<Widget> oldChildren = new HashSet<>();
+        for (Widget oldChild : getChildren()) {
+            oldChildren.add(oldChild);
+        }
+        super.insert(child, direction, size, before);
+        Set<Widget> newChildren = new HashSet<>();
+        for (Widget newChild : getChildren()) {
+            newChildren.add(newChild);
+        }
+        newChildren.removeAll(oldChildren);
+        for (Widget newChild : newChildren) {
+            if (newChild != child) {
+                // this has to be the splitter
+                DockLayoutPanel.LayoutData layoutData = (LayoutData) newChild.getLayoutData();
+                Element container = layoutData.layer.getContainerElement();
+                container.getStyle().setOverflow(Overflow.VISIBLE);
+                container.addClassName(getSplitterClassName(direction));
+            }
+        }
+    }
+    
+    private String getSplitterClassName(Direction direction) {
+        final String result;
+        if (isHorizontal(direction)) {
+            result = "SplitLayoutPanel-Divider-Horizontal";
+        } else {
+            result = "SplitLayoutPanel-Divider-Vertical";
+        }
+        return result;
+    }
+
+    private boolean isHorizontal(Direction direction) {
+        switch (getResolvedDirection(direction)) {
+        case WEST:
+        case EAST:
+            return true;
+        case NORTH:
+        case SOUTH:
+            return false;
+        default:
+            throw new RuntimeException("Unexpected direction: "+direction);
+        }
+    }
+}