使用 Tkinter 在Python中的图像查看器应用程序

先决条件： Python GUI – tkinter, Python: Pillow

你有没有想过在Python的帮助下制作一个图像查看器？这是在Python的帮助下制作图像查看器的解决方案。我们可以在 Tkinter 和枕头的帮助下做到这一点。我们将在下面讨论所需的模块和代码。

需要的模块

• Tkinter： Tkinter 是一个库，借助它我们可以制作 GUI（图形用户界面）。

pip install tkinter

• 枕头： 我们可以添加照片，因为它是Python的图像库。

pip install pillow

现在让我们为它编写代码

入门

• 下面的代码演示了生成的 GUI 的基本结构、按钮初始化和布局

Python3

# importing the tkinter module and PIL that
# is pillow module
from tkinter import *
from PIL import ImageTk, Image
 
# Calling the Tk (The initial constructor of tkinter)
root = Tk()
 
# We will make the title of our app as Image Viewer
root.title("Image Viewer")
 
# The geometry of the box which will be displayed
# on the screen
root.geometry("700x700")
 
# Adding the images using the pillow module which
# has a class ImageTk We can directly add the
# photos in the tkinter folder or we have to
# give a proper path for the images
image_no_1 = ImageTk.PhotoImage(Image.open("Sample.png"))
image_no_2 = ImageTk.PhotoImage(Image.open("sample.png"))
image_no_3 = ImageTk.PhotoImage(Image.open("Sample.png"))
image_no_4 = ImageTk.PhotoImage(Image.open("sample.png"))
 
# List of the images so that we traverse the list
List_images = [image_no_1, image_no_2, image_no_3, image_no_4]
 
label = Label(image=image_no_1)
 
# We have to show the the box so this below line is needed
label.grid(row=1, column=0, columnspan=3)
 
# We will have three button back ,forward and exit
button_back = Button(root, text="Back", command=back,
                     state=DISABLED)
 
# root.quit for closing the app
button_exit = Button(root, text="Exit",
                     command=root.quit)
 
button_forward = Button(root, text="Forward",
                        command=lambda: forward(1))
 
# grid function is for placing the buttons in the frame
button_back.grid(row=5, column=0)
button_exit.grid(row=5, column=1)
button_forward.grid(row=5, column=2)
 
root.mainloop()

• 转发函数：此函数用于为转发按钮添加功能

Python3

def forward(img_no):
 
    # GLobal variable so that we can have
    # access and change the variable
    # whenever needed
    global label
    global button_forward
    global button_back
    global button_exit
    label.grid_forget()
 
    # This is for clearing the screen so that
    # our next image can pop up
    label = Label(image=List_images[img_no-1])
 
    # as the list starts from 0 so we are
    # subtracting one
    label.grid(row=1, column=0, columnspan=3)
    button_for = Button(root, text="forward",
                        command=lambda: forward(img_no+1))
 
    # img_no+1 as we want the next image to pop up
    if img_no == 4:
        button_forward = Button(root, text="Forward",
                                state=DISABLED)
 
    # img_no-1 as we want previous image when we click
    # back button
    button_back = Button(root, text="Back",
                         command=lambda: back(img_no-1))
 
    # Placing the button in new grid
    button_back.grid(row=5, column=0)
    button_exit.grid(row=5, column=1)
    button_for.grid(row=5, column=2)

• 后退函数：此函数用于为后退按钮添加功能

Python3

def back(img_no):
 
    # We will have global variable to access these
    # variable and change whenever needed
    global label
    global button_forward
    global button_back
    global button_exit
    label.grid_forget()
 
    # for clearing the image for new image to pop up
    label = Label(image=List_images[img_no - 1])
    label.grid(row=1, column=0, columnspan=3)
    button_forward = Button(root, text="forward",
                            command=lambda: forward(img_no + 1))
    button_back = Button(root, text="Back",
                         command=lambda: back(img_no - 1))
    print(img_no)
 
    # whenever the first image will be there we will
    # have the back button disabled
    if img_no == 1:
        button_back = Button(root, Text="Back", state=DISABLED)
 
    label.grid(row=1, column=0, columnspan=3)
    button_back.grid(row=5, column=0)
    button_exit.grid(row=5, column=1)
    button_for.grid(row=5, column=2)

完整代码

使用的图像及其顺序 –

显示图像的顺序。

Python3

# importing the tkinter module and PIL
# that is pillow module
from tkinter import *
from PIL import ImageTk, Image
 
 
def forward(img_no):
 
    # GLobal variable so that we can have
    # access and change the variable
    # whenever needed
    global label
    global button_forward
    global button_back
    global button_exit
    label.grid_forget()
 
    # This is for clearing the screen so that
    # our next image can pop up
    label = Label(image=List_images[img_no-1])
 
    # as the list starts from 0 so we are
    # subtracting one
    label.grid(row=1, column=0, columnspan=3)
    button_for = Button(root, text="forward",
                        command=lambda: forward(img_no+1))
 
    # img_no+1 as we want the next image to pop up
    if img_no == 4:
        button_forward = Button(root, text="Forward",
                                state=DISABLED)
 
    # img_no-1 as we want previous image when we click
    # back button
    button_back = Button(root, text="Back",
                         command=lambda: back(img_no-1))
 
    # Placing the button in new grid
    button_back.grid(row=5, column=0)
    button_exit.grid(row=5, column=1)
    button_for.grid(row=5, column=2)
 
 
def back(img_no):
 
    # We will have global variable to access these
    # variable and change whenever needed
    global label
    global button_forward
    global button_back
    global button_exit
    label.grid_forget()
 
    # for clearing the image for new image to pop up
    label = Label(image=List_images[img_no - 1])
    label.grid(row=1, column=0, columnspan=3)
    button_forward = Button(root, text="forward",
                            command=lambda: forward(img_no + 1))
    button_back = Button(root, text="Back",
                         command=lambda: back(img_no - 1))
    print(img_no)
 
    # whenever the first image will be there we will
    # have the back button disabled
    if img_no == 1:
        button_back = Button(root, Text="Back", state=DISABLED)
 
    label.grid(row=1, column=0, columnspan=3)
    button_back.grid(row=5, column=0)
    button_exit.grid(row=5, column=1)
    button_for.grid(row=5, column=2)
 
 
# Calling the Tk (The initial constructor of tkinter)
root = Tk()
 
# We will make the title of our app as Image Viewer
root.title("Image Viewer")
 
# The geometry of the box which will be displayed
# on the screen
root.geometry("700x700")
 
# Adding the images using the pillow module which
# has a class ImageTk We can directly add the
# photos in the tkinter folder or we have to
# give a proper path for the images
image_no_1 = ImageTk.PhotoImage(Image.open("Sample.png"))
image_no_2 = ImageTk.PhotoImage(Image.open("sample.png"))
image_no_3 = ImageTk.PhotoImage(Image.open("Sample.png"))
image_no_4 = ImageTk.PhotoImage(Image.open("sample.png"))
 
# List of the images so that we traverse the list
List_images = [image_no_1, image_no_2, image_no_3, image_no_4]
 
label = Label(image=image_no_1)
 
# We have to show the the box so this below line is needed
label.grid(row=1, column=0, columnspan=3)
 
# We will have three button back ,forward and exit
button_back = Button(root, text="Back", command=back,
                     state=DISABLED)
 
# root.quit for closing the app
button_exit = Button(root, text="Exit",
                     command=root.quit)
 
button_forward = Button(root, text="Forward",
                        command=lambda: forward(1))
 
# grid function is for placing the buttons in the frame
button_back.grid(row=5, column=0)
button_exit.grid(row=5, column=1)
button_forward.grid(row=5, column=2)
 
root.mainloop()

输出：