Drawer add draggable prop

src/styles/components/drawer.less

@@ -36,6 +36,10 @@
             position: absolute;
             overflow: hidden;
         }
+
+        &-dragging{
+            user-select: none;
+        }
     }
 
     &-wrap * {
@@ -93,4 +97,36 @@
     &-no-mask{
         pointer-events: none;
     }
+
+    &-drag{
+        top: 0;
+        height: 100%;
+        width: 0;
+        position: absolute;
+        &-left{
+            right: 0;
+        }
+        &-move-trigger{
+            width: 8px;
+            height: 100px;
+            line-height: 100px;
+            position: absolute;
+            top: 50%;
+            background: rgb(243, 243, 243);
+            transform: translate(-50%, -50%);
+            border-radius: ~"4px / 6px";
+            box-shadow: 0 0 1px 1px rgba(0, 0, 0, .2);
+            cursor: col-resize;
+            &-point{
+                display: inline-block;
+                width: 50%;
+                transform: translateX(50%);
+                i{
+                    display: block;
+                    border-bottom: 1px solid rgb(192, 192, 192);
+                    padding-bottom: 2px;
+                }
+            }
+        }
+    }
 }