项目结构调整

Others/Dragablz/Dragablz/EmptyHeaderSizingHint.cs

@@ -0,0 +1,22 @@
+namespace Dragablz
+{
+    /// <summary>
+    /// Provide a hint for how the header should size itself if there are no tabs left (and a Window is still open).
+    /// </summary>
+    public enum EmptyHeaderSizingHint
+    {
+        /// <summary>
+        /// The header size collapses to zero along the correct axis.
+        /// </summary>
+        Collapse,
+        /// <summary>
+        /// The header size remains that of the last tab prior to the tab header becoming empty.
+        /// </summary>
+        PreviousTab,
+        //TODO implement EmptyHeaderSizingHint.Stretch        
+        /// <summary>
+        /// The header stretches along the according axis.
+        /// </summary>
+        //Stretch
+    }
+}