diff --git a/src/ui/canvas/canvas.tsx b/src/ui/canvas/canvas.tsx
index f7da1a9..c3b7e80 100644
--- a/src/ui/canvas/canvas.tsx
+++ b/src/ui/canvas/canvas.tsx
@@ -74,19 +74,6 @@ export class Canvas extends Component<HTMLCanvasElement, CanvasOptions> implemen
                     {
                         text: "力",
                         icon: ArrowRightFromLine,
-                    },
-                    {
-                        text: "test item",
-                        subItems: [
-                            {
-                                text: "test item",
-                                subItems: [
-                                    {
-                                        text: "hello world"
-                                    }
-                                ]
-                            }
-                        ]
                     }
                 ]
             }
diff --git a/src/ui/contextMenu/contextMenu.tsx b/src/ui/contextMenu/contextMenu.tsx
index 26b0ba4..befa410 100644
--- a/src/ui/contextMenu/contextMenu.tsx
+++ b/src/ui/contextMenu/contextMenu.tsx
@@ -42,6 +42,8 @@ const defaultOptions: ContextMenuOptions = {
 };
 
 export interface IContextMenu extends IComponent {
+    setPosition(position: ContextMenuPosition): void
+
     id?: string
 }
 
@@ -73,27 +75,7 @@ export class ContextMenu extends Component<HTMLDivElement, ContextMenuOptions> i
             : this._createItem(info);
         }
 
-        const width = this.contextMenuElem.clientWidth;
-        const height = this.contextMenuElem.clientHeight;
-
-        switch(this._options.position) {
-            case "top-left":
-                this.contextMenuElem.style.left = (this._options.anchor.x - width) +"px";
-                this.contextMenuElem.style.top = (this._options.anchor.y - height) +"px";
-                break;
-            case "top-right":
-                this.contextMenuElem.style.left = this._options.anchor.x +"px";
-                this.contextMenuElem.style.top = (this._options.anchor.y - height) +"px";
-                break;
-            case "bottom-left":
-                this.contextMenuElem.style.left = (this._options.anchor.x - width) +"px";
-                this.contextMenuElem.style.top = this._options.anchor.y +"px";
-                break;
-            case "bottom-right":
-                this.contextMenuElem.style.left = this._options.anchor.x +"px";
-                this.contextMenuElem.style.top = this._options.anchor.y +"px";
-                break;
-        }
+        this.setPosition(this._options.position);
 
         // Remove the context menu when the user clicks outside
         this._element.addEventListener("mousedown", (e) => {
@@ -127,6 +109,40 @@ export class ContextMenu extends Component<HTMLDivElement, ContextMenuOptions> i
         this._register(item);
     }
 
+    public setPosition(position: ContextMenuPosition) {
+        this._options.position = position;
+
+        const width = this.width;
+        const height = this.height;
+
+        switch(position) {
+            case "top-left":
+                this.contextMenuElem.style.left = (this._options.anchor.x - width) +"px";
+                this.contextMenuElem.style.top = (this._options.anchor.y - height) +"px";
+                break;
+            case "top-right":
+                this.contextMenuElem.style.left = this._options.anchor.x +"px";
+                this.contextMenuElem.style.top = (this._options.anchor.y - height) +"px";
+                break;
+            case "bottom-left":
+                this.contextMenuElem.style.left = (this._options.anchor.x - width) +"px";
+                this.contextMenuElem.style.top = this._options.anchor.y +"px";
+                break;
+            case "bottom-right":
+                this.contextMenuElem.style.left = this._options.anchor.x +"px";
+                this.contextMenuElem.style.top = this._options.anchor.y +"px";
+                break;
+        }
+    }
+
+    public get width() {
+        return this.contextMenuElem.clientWidth;
+    }
+
+    public get height() {
+        return this.contextMenuElem.clientHeight;
+    }
+
     public get id() {
         return this._options.id;
     }
diff --git a/src/ui/contextMenu/contextMenuProvider.ts b/src/ui/contextMenu/contextMenuProvider.ts
index 0fbb05d..4f3999b 100644
--- a/src/ui/contextMenu/contextMenuProvider.ts
+++ b/src/ui/contextMenu/contextMenuProvider.ts
@@ -52,10 +52,30 @@ class ContextMenuProvider extends Provider<ContextMenu> implements IContextMenuP
             e.stopPropagation();
 
             this.clearContextMenus();
-            this.createContextMenu(items, {
+            
+            // eslint-disable-next-line no-unused-vars, @typescript-eslint/no-unused-vars
+            type TopOrBottom<P = ContextMenuPosition> = P extends `${infer A}-${infer _B}` ? A : never;
+            // eslint-disable-next-line no-unused-vars, @typescript-eslint/no-unused-vars
+            type LeftOrRight<P = ContextMenuPosition> = P extends `${infer _A}-${infer B}` ? B : never;
+            
+            // default: "top-right"
+            let a: TopOrBottom = "top";
+            let b: LeftOrRight = "right";
+            
+            const menu = this.createContextMenu(items, {
                 x: e.clientX,
                 y: e.clientY
-            }, "top-right");
+            }, `${a}-${b}`);
+            const { width, height } = menu;
+            
+            if(e.clientX + width > window.innerWidth) {
+                b = "left";
+            }
+            if(e.clientY - height < 0) {
+                a = "bottom";
+            }
+
+            menu.setPosition(`${a}-${b}`);
         });
     }