基本完成组件现代化

src/heurams/interface/widgets/placeholder.py

@@ -1,26 +1,14 @@
-from textual.app import App, ComposeResult
-from textual.events import Event
 from textual.widgets import (
-    Collapsible,
-    Header,
-    Footer,
-    Markdown,
-    ListView,
-    ListItem,
     Label,
-    Static,
     Button,
 )
 from textual.widget import Widget
 
 
 class Placeholder(Widget):
-    def __init__(self, *children: Widget, name: str | None = None, id: str | None = None, classes: str | None = None, disabled: bool = False, markup: bool = True) -> None:
+    def __init__(self, *children: Widget, name: str | None = None, alia: str = "", id: str | None = None, classes: str | None = None, disabled: bool = False, markup: bool = True) -> None:
         super().__init__(*children, name=name, id=id, classes=classes, disabled=disabled, markup=markup)
 
     def compose(self):
         yield Label("示例标签", id="testlabel")
-        yield Button("示例按钮", id="testbtn", classes="choice")
-
-    def handler(self, event, type_):
-        self.screen.query_one("#testlabel", Label).update("hi")
+        yield Button("示例按钮", id="testbtn", classes="choice")