python tkinter how to bind key to a button

Question

New to programming and especially python and tKinter. How can I create a way to bind the key "s" to the button or the function sharpen? Any help would be awesome.

from Tkinter import *
from PIL import Image, ImageTk, ImageFilter, ImageEnhance

class Application(Frame):
    def __init__(self, master=None):
        Frame.__init__(self, master)
        master.wm_title("Image examples")
        self.pack()
        self.createWidgets()

def createWidgets(self):
    self.img = Image.open("lineage.jpg")
    self.photo1 = ImageTk.PhotoImage(self.img.convert("RGB"))
    self.label1 = Label(self, image=self.photo1)
    self.label1.grid(row=0, column=0, padx=5, pady=5, rowspan=10)

    self.photo2 = ImageTk.PhotoImage(self.img.convert("RGB"))
    self.label2 = Label(self, image=self.photo2)
    self.label2.grid(row=0, column=1, padx=5, pady=5, rowspan=10)

    button5 = Button(self, text="Sharpen", command=self.sharpen)
    button5.grid(row=4, column= 2, sticky = N)

def sharpen(self):
    img2 = self.img.filter(ImageFilter.SHARPEN)
    self.photo2 = ImageTk.PhotoImage(img2)
    self.label2 = Label(self, image=self.photo2)
    self.label2.grid(row=0, column=1, padx=5, pady=5, rowspan=10)

unutbu · Accepted Answer · 2013-12-28T00:44:20.110

16

You'll need to make two changes:

Add
```
master.bind('s', self.sharpen)
```
to __init__. (Binding to the Frame, self, does not seem to work.)
When s is pressed, self.sharpen(event) will be called. Since Tkinter will be sending a Tkinter.Event object, we must also change the call signature to
```
def sharpen(self, event=None):
```
Thus, when the button is pressed, event will be set to the default value, None, but when the s key is pressed, event will be assigned to the Tkinter.Event object.

edited Dec 28 '13 at 00:44

answered Nov 10 '12 at 23:24

unutbu

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Will it take for account whether the button is disabled or not. I think it should rather be binded with Button.invoke(). – pepece Jun 06 '19 at 08:10

score 2 · Answer 2 · edited Aug 28 '18 at 00:41

2

Use bind_all like this:

def sharpen(self, event):
    master.bind_all('s', sharpen)

You can find more info at the Python docs.

edited Aug 28 '18 at 00:41

Stephen Rauch

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answered Aug 28 '18 at 00:22

Benjy Springall

21
1

score 1 · Answer 3 · answered Nov 10 '12 at 23:16

You can use bind. I'm going to assume the indenting in your question is wrong and sharpen is an Application method.

class Application(Frame):
    def __init__(self, master=None):
        Frame.__init__(self, master)
        master.wm_title("Image examples")
        self.pack()
        self.createWidgets()
        self.bind("s", self.sharpen)

Pythonware has useful information about event handling.

python tkinter how to bind key to a button

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