diff --git a/packages/core/__tests__/lib/core-is.test.ts b/packages/core/__tests__/lib/core-is.test.ts
index df22c06..5310b19 100644
--- a/packages/core/__tests__/lib/core-is.test.ts
+++ b/packages/core/__tests__/lib/core-is.test.ts
@@ -1,6 +1,6 @@
 import Core from './../../src';
 
-describe("@idraw/core static is", () => {
+describe("@idraw/core:static is", () => {
 
   test('Core.is.number', () => {
     expect(Core.is.number(0)).toStrictEqual(true);
diff --git a/packages/core/examples/features/css/index.css b/packages/core/examples/features/css/index.css
index 5d0eaeb..b9f15ca 100644
--- a/packages/core/examples/features/css/index.css
+++ b/packages/core/examples/features/css/index.css
@@ -61,6 +61,7 @@ html, body {
   line-height: 30px;
   color: #666;
   font-size: 14px;
+  user-select: none;
 }
 
 .elem-item:last-child {
diff --git a/packages/core/examples/features/lib/element.js b/packages/core/examples/features/lib/element.js
index 686ad94..7263603 100644
--- a/packages/core/examples/features/lib/element.js
+++ b/packages/core/examples/features/lib/element.js
@@ -49,7 +49,21 @@ function listenElements(core) {
       renderElemens(core);
     } else if (el.hasAttribute('data-elem-btn-lock')) {
       const uuid = el.getAttribute('data-elem-btn-lock');
-      core.moveDownElement(uuid);
+      const elem = core.getElement(uuid);
+      if (!elem.operation) {
+        elem.operation = {};
+      }
+      elem.operation.lock = !elem.operation.lock;
+      core.updateElement(elem);
+      renderElemens(core);
+    } else if (el.hasAttribute('data-elem-btn-invisible')) {
+      const uuid = el.getAttribute('data-elem-btn-invisible');
+      const elem = core.getElement(uuid);
+      if (!elem.operation) {
+        elem.operation = {};
+      }
+      elem.operation.invisible = !elem.operation.invisible;
+      core.updateElement(elem);
       renderElemens(core);
     }
   }, true);
diff --git a/packages/core/examples/features/lib/main.js b/packages/core/examples/features/lib/main.js
index b040549..be08f5e 100644
--- a/packages/core/examples/features/lib/main.js
+++ b/packages/core/examples/features/lib/main.js
@@ -39,7 +39,7 @@ const core = new Core(mount, {
 });
 
 
-initEvent();
+// initEvent();
 
 core.setData(data);
 
@@ -85,4 +85,9 @@ function initEvent() {
     console.log('screenDoubleClickElement ===', p)
   })
   
-}
\ No newline at end of file
+}
+
+// TODO
+core.on('screenDoubleClickElement', (p) => {
+  console.log('screenDoubleClickElement ===', p)
+})
\ No newline at end of file
diff --git a/packages/core/src/mixins/event.ts b/packages/core/src/mixins/event.ts
index d62e6c8..7b9dd63 100644
--- a/packages/core/src/mixins/event.ts
+++ b/packages/core/src/mixins/event.ts
@@ -37,10 +37,13 @@ function handleDoubleClick(core: Core) {
   return function ( point: TypePoint) {
     const [index, uuid] = core[_element].isPointInElement(point, core[_data]);
     if (index >= 0 && uuid) {
-      core[_coreEvent].trigger(
-        'screenDoubleClickElement', 
-        { index, uuid, element: deepClone(core[_data].elements?.[index])}
-      );
+      const elem = deepClone(core[_data].elements?.[index]);
+      if (elem?.operation?.invisible !== true) {
+        core[_coreEvent].trigger(
+          'screenDoubleClickElement', 
+          { index, uuid, element: deepClone(core[_data].elements?.[index])}
+        );
+      }
     }
     core[_draw]();
   }
@@ -90,7 +93,6 @@ function handlePoint(core: Core) {
 
 function handleClick(core: Core) {
   return function(point: TypePoint): void {
-    console.log('handleClick: point =', point)
     const [index, uuid] = core[_element].isPointInElement(point, core[_data]);
     if (index >= 0 && uuid) {
       core[_coreEvent].trigger(