缩放和菜单问题 (Tkinter)

Question

我正在尝试从菜单加载图像，然后对图像进行放大和缩小。

问题是我的程序不执行菜单直接启动图像加载。我该如何解决？

谢谢！

from Tkinter import *
import Image, ImageTk,tkFileDialog

class LoadImage:
    def __init__(self,root):
        frame = Frame(root)
        self.canvas = Canvas(frame,width=900,height=900)
        self.canvas.pack()
        frame.pack()
        options={}
        options['defaultextension']='.gif'
        options['filetypes']=[('GIF','.gif'),('JPEG','.jpg'),('TIFF','.tif')]
        options['title']='Select image file'
        File=tkFileDialog.askopenfilename(**options)
        self.orig_img = Image.open(File)
        self.img = ImageTk.PhotoImage(self.orig_img)
        self.canvas.create_image(0,0,image=self.img, anchor="nw")
        self.zoomcycle = 0
        self.zimg_id = None
        root.bind("<MouseWheel>",self.zoomer)
        self.canvas.bind("<Motion>",self.crop)

    def zoomer(self,event):
        if (event.delta > 0):
            if self.zoomcycle != 4: self.zoomcycle += 1
        elif (event.delta < 0):
            if self.zoomcycle != 0: self.zoomcycle -= 1
        self.crop(event)

    def crop(self,event):
        if self.zimg_id: self.canvas.delete(self.zimg_id)
        if (self.zoomcycle) != 0:
            x,y = event.x, event.y
            if self.zoomcycle == 1:
                tmp = self.orig_img.crop((x-45,y-30,x+45,y+30))
            elif self.zoomcycle == 2:
                tmp = self.orig_img.crop((x-30,y-20,x+30,y+20))
            elif self.zoomcycle == 3:
                tmp = self.orig_img.crop((x-15,y-10,x+15,y+10))
            elif self.zoomcycle == 4:
                tmp = self.orig_img.crop((x-6,y-4,x+6,y+4))
            size = 300,200
            self.zimg = ImageTk.PhotoImage(tmp.resize(size))
            self.zimg_id = self.canvas.create_image(event.x,event.y,image=self.zimg)

root = Tk()
root.title("Crop Test")
menubar = Menu(root)
filemenu = Menu(menubar, tearoff=0)
filemenu.add_command(label="Abrir", command=LoadImage(root))
menubar.add_cascade(label="Archivo", menu=filemenu)
root.config(menu=menubar)
root.mainloop()

Answer 1

filemenu.add_command(label="Abrir", command=LoadImage(root))

command=LoadImage(root) 将实例化您的 LoadImage class，并调用文件对话框。你想

用单独的方法（比如 'abrir'）将 class 的文件打开操作分开
实例化 class 与 GUI 函数分开（例如 li = LoadImage()）
将 'abrir' 方法连接到菜单中的 Abrir 按钮

这样分开：

li = LoadImage(root)
filemenu.add_command(label = "Abrir", command = li.abrir)

最好分开创建 classes。这是更正后的代码：

from Tkinter import *
import Image, ImageTk,tkFileDialog

class LoadImage:
    def __init__(self,root):
        frame = Frame(root)
        self.canvas = Canvas(frame,width=900,height=900)
        self.canvas.pack()
        frame.pack()
        self.zoomcycle = 0
        self.zimg_id = None
        root.bind("<MouseWheel>", self.zoomer)
        self.canvas.bind("<Motion>", self.crop)

    def abrir(self):
        File = "nlx019PQVT1sidekro1_540.jpg"
        options={}
        options['defaultextension']='.gif'
        options['filetypes']=[('GIF','.gif'),('JPEG','.jpg'),('TIFF','.tif')]
        options['title']='Select image file'
        File=tkFileDialog.askopenfilename()
        self.orig_img = Image.open(File)
        self.img = ImageTk.PhotoImage(self.orig_img)
        self.canvas.create_image(0,0,image=self.img, anchor="nw")

    def zoomer(self,event):
        if (event.delta > 0):
            if self.zoomcycle != 4: self.zoomcycle += 1
        elif (event.delta < 0):
            if self.zoomcycle != 0: self.zoomcycle -= 1
        self.crop(event)

    def crop(self, event):
        if self.zimg_id: self.canvas.delete(self.zimg_id)
        if (self.zoomcycle) != 0:
            x,y = event.x, event.y
            if self.zoomcycle == 1:
                tmp = self.orig_img.crop((x-45,y-30,x+45,y+30))
            elif self.zoomcycle == 2:
                tmp = self.orig_img.crop((x-30,y-20,x+30,y+20))
            elif self.zoomcycle == 3:
                tmp = self.orig_img.crop((x-15,y-10,x+15,y+10))
            elif self.zoomcycle == 4:
                tmp = self.orig_img.crop((x-6,y-4,x+6,y+4))
            size = 300,200
            self.zimg = ImageTk.PhotoImage(tmp.resize(size))
            self.zimg_id = self.canvas.create_image(event.x,event.y,image=self.zimg)

root = Tk()
root.title("Crop Test")
menubar = Menu(root)
filemenu = Menu(menubar, tearoff=0)

li = LoadImage(root)
filemenu.add_command(label = "Abrir", command = li.abrir)
menubar.add_cascade(label = "Archivo", menu = filemenu)
root.config(menu = menubar)
root.mainloop()

注意：我没有检查其余代码是否有效 - 但文件打开问题已在此处解决:)

缩放和菜单问题 (Tkinter)

Problems with zoom and menu (Tkinter)

python

tkinter