Added ColumnAt(BPoint) version.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33587 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/interface/ColumnListView.h

@@ -297,6 +297,7 @@ public:
 			void				RemoveColumn(BColumn* column);
 			int32				CountColumns() const;
 			BColumn*			ColumnAt(int32 index) const;
+			BColumn*			ColumnAt(BPoint point) const;
 			void				SetColumnVisible(BColumn* column,
 									bool isVisible);
 			void				SetColumnVisible(int32, bool);

src/kits/interface/ColumnListView.cpp

@@ -1118,6 +1118,26 @@ BColumnListView::ColumnAt(int32 field) const
 }
 
 
+BColumn*
+BColumnListView::ColumnAt(BPoint point) const
+{
+	float left = MAX(kLeftMargin, LatchWidth());
+
+	for (int i = 0; BColumn* column = (BColumn*)fColumns.ItemAt(i); i++) {
+		if (!column->IsVisible())
+			continue;
+
+		float right = left + column->Width();
+		if (point.x >= left && point.x <= right)
+			return column;
+
+		left = right + 1;
+	}
+
+	return NULL;
+}
+
+
 void
 BColumnListView::SetColumnVisible(BColumn* column, bool visible)
 {