Tkinter中Entry组件焦点检测指南

import tkinter as tk

def check_current_focus():
    """
    检测并打印当前获得焦点的组件。
    """
    focused_widget = root.focus_get()
    if focused_widget:
        # 获取组件的类名和ID，用于识别
        widget_info = f"类型: {focused_widget.winfo_class()}, ID: {focused_widget.winfo_id()}"
        print(f"当前获得焦点的组件是: {widget_info}")

        # 进一步判断是否是特定的Entry组件
        if focused_widget == entry1:
            result_label.config(text="Entry 1 获得焦点")
        elif focused_widget == entry2:
            result_label.config(text="Entry 2 获得焦点")
        else:
            result_label.config(text=f"其他组件获得焦点: {focused_widget.winfo_class()}")
    else:
        print("当前没有组件获得焦点。")
        result_label.config(text="当前没有组件获得焦点")

# 创建主窗口
root = tk.Tk()
root.title("Tkinter Entry 焦点检测示例")
root.geometry("400x300")

# 创建Entry组件
tk.Label(root, text="输入框 1:").pack(pady=5)
entry1 = tk.Entry(root, highlightbackground="gray", highlightthickness=1)
entry1.pack(pady=5)

tk.Label(root, text="输入框 2:").pack(pady=5)
entry2 = tk.Entry(root, highlightbackground="gray", highlightthickness=1)
entry2.pack(pady=5)

# 创建一个按钮，点击时检测焦点
check_button = tk.Button(root, text="检测当前焦点", command=check_current_focus)
check_button.pack(pady=15)

# 用于显示检测结果的标签
result_label = tk.Label(root, text="点击按钮检测焦点...", fg="blue")
result_label.pack(pady=5)

# 运行主循环
root.mainloop()

import tkinter as tk

def on_focus_in(event):
    """
    当任何Entry组件获得焦点时触发。
    event.widget 属性指向获得焦点的组件。
    """
    focused_widget = event.widget
    if focused_widget == entry_a:
        status_label.config(text="Entry A 获得焦点", fg="green")
    elif focused_widget == entry_b:
        status_label.config(text="Entry B 获得焦点", fg="blue")
    else:
        status_label.config(text=f"其他组件获得焦点: {focused_widget.winfo_class()}", fg="black")
    print(f"焦点移入: {focused_widget.winfo_class()} (ID: {focused_widget.winfo_id()})")

# 创建主窗口
root = tk.Tk()
root.title("Tkinter 焦点事件监听示例")
root.geometry("400x250")

# 创建Entry组件
tk.Label(root, text="Entry A:").pack(pady=5)
entry_a = tk.Entry(root, highlightbackground="red", highlightthickness=1)
entry_a.pack(pady=5)
# 绑定<FocusIn>事件
entry_a.bind("<FocusIn>", on_focus_in)

tk.Label(root, text="Entry B:").pack(pady=5)
entry_b = tk.Entry(root, highlightbackground="blue", highlightthickness=1)
entry_b.pack(pady=5)
# 绑定<FocusIn>事件
entry_b.bind("<FocusIn>", on_focus_in)

# 状态显示标签
status_label = tk.Label(root, text="请点击一个输入框...", font=("Arial", 12))
status_label.pack(pady=15)

# 运行主循环
root.mainloop()