update 一系列功能

Web/src/assets/style/lib/tree-layout.less

@@ -29,7 +29,7 @@
     }
     .swiper-container {
       position: absolute;
-      top: @layout-header-height - 20px;
+      top: @layout-header-height;
       left: 0;
       bottom: 0;
 
@@ -38,6 +38,32 @@
         height: auto;
         min-height: 100%;
       }
+      .swiper-scrollbar {
+        transition: @animation-duration-slow opacity;
+
+        opacity: 0;
+      }
+      &:hover {
+        .swiper-scrollbar {
+          opacity: 1;
+        }
+      }
+    }
+  }
+  &--bar {
+    line-height: 20px;
+
+    height: 20px;
+    padding: 0 @padding-md;
+
+    text-align: right;
+    >.anticon {
+      cursor: pointer;
+
+      color: fade(@black, 50%);
+      &:hover {
+        color: fade(@black, 80%);
+      }
     }
   }
 }