fix: Fix issues related to context menu in the flow chart page.

1. Fixes the issue that right click on an element would trigger it to be focused in the browser.
2. Fixes the issue that after scrolling the window, the context menu might be generated in a improper location.

ElectronJS/src/taskGrid/FlowChart.js

@@ -4,7 +4,7 @@ let root = {
     index: 0, //在nodeList中的索引号
     id: 0,
     parentId: 0,
-    type: -1,
+    type: -1, // 0: 顺序结构；1:循环结构；2:分支结构
     option: 0,
     title: "root",
     sequence: [],
@@ -484,7 +484,7 @@ function operationChange(e, theNode) {
     vueData.nowNodeIndex = actionSequence[theNode.getAttribute("data")];
     theNode.style.borderColor = "blue";
     handleElement(); //处理元素
-    if (debuggable) {
+    if (debuggable && e.button == 0) {
         trailElement(app._data.nowNode, 0);
     } else {
         debuggable = true;
@@ -664,13 +664,14 @@ function toolBoxKernel(e, param = null) {
             isInLoop: false,
         };
         nodeList.push(t);
-        if (option == 8) //循环
+        if (option == 8) // 循环模式下 type 设置为 1
         {
             t["type"] = 1;
-        } else if (option == 9) //判断
+        } else if (option == 9) // 判断模式下 type 设置为 2
         {
             t["type"] = 2;
-            // 增加两个分支
+            // 增加两个分支节点
+            // 这两个分支节点需要放入 nodeList 中，并且需要在 t 的 sequence 中添加它们的 index 
             nt = {
                 id: 0,
                 parentId: 0,
@@ -894,6 +895,10 @@ function deleteElement() {
 }
 
 document.getElementById("flowchart_graph").oncontextmenu = function (e) {
+    let menu = document.getElementById("contextMenu")
+    if (menu) {
+        menu.remove(); //如果右键菜单已经存在，先删除它
+    }
     // 创建一个包含删除选项的右键菜单
     let contextMenu = document.createElement("div");
     contextMenu.id = "contextMenu";
@@ -937,8 +942,8 @@ document.getElementById("flowchart_graph").oncontextmenu = function (e) {
     // 设置右键菜单的样式
     contextMenu.style.position = "absolute";
     contextMenu.style.backgroundColor = "rgb(248, 249, 250)";
-    contextMenu.style.left = event.clientX + "px";
-    contextMenu.style.top = event.clientY + "px";
+    contextMenu.style.left = e.pageX + "px";
+    contextMenu.style.top = e.pageY + "px";
     contextMenu.style.width = LANG("180px", "250px");
 
     // 添加删除元素的功能