import os
import tkinter as tk
from tkinter import filedialog, messagebox
from PIL import Image, ImageTk
 
class ImageViewer:
    def __init__(self, root):
        self.root = root
        self.root.title("圖片查看器")
        self.root.geometry("800x600")
        self.root.configure(bg="#2E3440")  # 設(shè)置背景顏色
 
        # 當(dāng)前圖片路徑
        self.current_image_path = None
        self.image = None
        self.photo = None
        self.scale_factor = 1.0
        self.is_auto_scaling = True  # 是否自動(dòng)縮放
 
        # 創(chuàng)建界面
        self.create_widgets()
 
    def create_widgets(self):
        """創(chuàng)建界面組件"""
        # 頂部工具欄
        toolbar = tk.Frame(self.root, bg="#3B4252")  # 工具欄背景顏色
        toolbar.pack(side=tk.TOP, fill=tk.X)
 
        # 打開按鈕
        btn_open = tk.Button(toolbar, text="打開", command=self.open_image, bg="#81A1C1", fg="white", activebackground="#5E81AC", activeforeground="white", font=("微軟雅黑", 12))
        btn_open.pack(side=tk.LEFT, padx=5, pady=5)
 
        # 放大按鈕
        btn_zoom_in = tk.Button(toolbar, text="放大", command=self.zoom_in, bg="#81A1C1", fg="white", activebackground="#5E81AC", activeforeground="white", font=("微軟雅黑", 12))
        btn_zoom_in.pack(side=tk.LEFT, padx=5, pady=5)
 
        # 縮小按鈕
        btn_zoom_out = tk.Button(toolbar, text="縮小", command=self.zoom_out, bg="#81A1C1", fg="white", activebackground="#5E81AC", activeforeground="white", font=("微軟雅黑", 12))
        btn_zoom_out.pack(side=tk.LEFT, padx=5, pady=5)
 
        # 圖片顯示區(qū)域
        self.canvas = tk.Canvas(self.root, bg="#2E3440", highlightthickness=0)
        self.canvas.pack(fill=tk.BOTH, expand=True)
 
        # 綁定窗口大小變化事件
        self.root.bind("<Configure>", self.on_window_resize)
 
    def open_image(self):
        """打開圖片"""
        file_path = filedialog.askopenfilename(
            title="選擇圖片",
            filetypes=[("圖片文件", "*.jpg *.jpeg *.png *.bmp *.gif")]
        )
        if file_path:
            self.current_image_path = file_path
            self.load_image()
 
    def load_image(self):
        """加載圖片"""
        try:
            self.image = Image.open(self.current_image_path)
            self.scale_factor = 1.0
            self.is_auto_scaling = True  # 加載圖片時(shí)啟用自動(dòng)縮放
            self.update_image()
        except Exception as e:
            messagebox.showerror("錯(cuò)誤", f"無法加載圖片: {str(e)}")
 
    def update_image(self):
        """更新顯示的圖片"""
        if self.image:
            # 計(jì)算縮放后的尺寸
            canvas_width = self.canvas.winfo_width()
            canvas_height = self.canvas.winfo_height()
            image_width, image_height = self.image.size
 
            if self.is_auto_scaling:
                # 自動(dòng)縮放時(shí)計(jì)算縮放比例
                width_ratio = canvas_width / image_width
                height_ratio = canvas_height / image_height
                self.scale_factor = min(width_ratio, height_ratio)
 
            # 縮放圖片
            width = int(image_width * self.scale_factor)
            height = int(image_height * self.scale_factor)
            resized_image = self.image.resize((width, height), Image.Resampling.LANCZOS)
            self.photo = ImageTk.PhotoImage(resized_image)
 
            # 清除畫布并顯示圖片
            self.canvas.delete("all")
            self.canvas.create_image(
                canvas_width // 2,
                canvas_height // 2,
                anchor=tk.CENTER,
                image=self.photo
            )
 
    def zoom_in(self):
        """放大圖片"""
        if self.image:
            self.is_auto_scaling = False  # 手動(dòng)縮放時(shí)禁用自動(dòng)縮放
            self.scale_factor *= 1.2
            self.update_image()
 
    def zoom_out(self):
        """縮小圖片"""
        if self.image:
            self.is_auto_scaling = False  # 手動(dòng)縮放時(shí)禁用自動(dòng)縮放
            self.scale_factor /= 1.2
            self.update_image()
 
    def on_window_resize(self, event):
        """窗口大小變化時(shí)自動(dòng)調(diào)整圖片大小"""
        if self.image and self.is_auto_scaling:
            self.update_image()
 
if __name__ == "__main__":
    root = tk.Tk()
    app = ImageViewer(root)
    root.mainloop()