Scrollbar in Tkinter - python

I tried many things to do 2 things :
center my content (horizontal)
have a scrollbar right and bottom
Here my code :
# encoding: utf8
from tkinter import *
from tkinter import ttk
class Program:
def __init__(self):
# Tk.__init__(self)
# Fill the content of the window
self.window = Tk()
self.window.geometry("1080x720")
self.createFrameWithScrollbar()
self.content()
def createFrameWithScrollbar(self):
# Create a Main Frame
self.mainFrame = Frame(self.window)
self.mainFrame.pack(fill=BOTH, expand=True)
# Create a canvas
self.canvas = Canvas(self.mainFrame)
self.canvas.pack(side=LEFT, fill=BOTH, expand=True)
# Add a scrobar
yScrollbar = ttk.Scrollbar(self.mainFrame, orient=VERTICAL, command=self.canvas.yview)
yScrollbar.pack(side=RIGHT, fill=Y)
xScrollbar = ttk.Scrollbar(self.mainFrame, orient=HORIZONTAL, command=self.canvas.xview)
xScrollbar.pack(side=BOTTOM, fill=X)
# Configure the canvas
self.canvas.configure(yscrollcommand=yScrollbar.set)
self.canvas.configure(xscrollcommand=xScrollbar.set)
self.canvas.bind('<Configure>', lambda e: self.canvas.configure(scrollregion = self.canvas.bbox("all")))
self.frame = Frame(self.canvas)
self.canvas.create_window((0,0), window=self.frame, anchor="nw")
self.currentFrame = Frame(self.frame)
self.currentFrame.configure(bg="red")
self.currentFrame.pack(fill=BOTH, expand=1)
def content(self):
label_title = Label(self.currentFrame, text="Title")
label_title.grid(column=0, row=0, sticky=NSEW)
label_description = Label(self.currentFrame, text="Title")
label_description.grid(column=0, row=1, sticky=NSEW)
label_version = Label(self.currentFrame, text="0.2 beta [Novembre 2020]")
label_version.grid(column=0, row=2, sticky=NSEW)
# Lauch the program
app = Program()
app.window.mainloop()
So the result is the following :
So any suggestion ?
The bottom sidebar is so small ! I don't know why.
Are regarding the text, it's not center at all ;(
I want to have it center and changing position if I rezize the window
Thanks a lot

pack works by allocating space along an entire empty side of the master, so the order of when you call pack matters. When you pack the canvas before packing the scrollbar, the canvas takes up the entire left side from top to bottom.
The simple solution is to pack the scrollbars before you pack the canvas.
yScrollbar.pack(side=RIGHT, fill=Y)
xScrollbar.pack(side=BOTTOM, fill=X)
self.canvas.pack(side=LEFT, fill=BOTH, expand=True)
To make the UI look a bit more professional, grid is usually a better choice when laying out scrollbars. With pack, either one edge of the horizontal scrollbar will be below the vertical scrollbar, or the edge of the vertical scrollbar will be directly beside the horizontal one. That, or you have to add a little bit of padding so the scrollbars don't seem to overlap.
When I have a scrollable widget, I almost always put it and the one or two scrollbars together in a frame using grid. Then, I can treat them all as if they were a single widget when adding them to the rest of the UI.
In a comment you ask about how to do it in a grid. You simply need to place the widgets in the appropriate rows and columns, and make sure that the row and column with the scrollable widget has a non-zero weight so any extra space is allocated to it.
self.mainFrame.grid_rowconfigure(0, weight=1)
self.mainFrame.grid_columnconfigure(0, weight=1)
yScrollbar.grid(row=0, column=1, sticky="ns")
xScrollbar.grid(row=1, column=0, sticky="ew")
self.canvas.grid(row=0, column=0, sticky="nsew")

Related

Python tk scrollbar on listbox not working in windows 10

I have python3 tk code that seems to work okay in linux (ubuntu) but bizarely does not work in windows 10. The scrollbar on the listbox doesn't scroll in windows ...
import tkinter as tk
root = tk.Tk()
root.title("My MHT")
root.geometry("500x500")
# create all of the main containers
toppest_frame = tk.Frame(root, bg='thistle3', width=500, height=25, pady=3)
top_frame = tk.Frame(root, bg='cyan', width=500, height=250, pady=3)
bottom_frame = tk.Frame(root, bg='lavender', width=500, height=250, pady=3)
# layout all of the main containers
root.grid_rowconfigure(0, weight=1)
root.grid_rowconfigure(1, weight=1)
root.grid_rowconfigure(2, weight=1)
root.grid_columnconfigure(0, weight=1)
toppest_frame.grid(row=0, sticky="nesw")
top_frame.grid(row=1, sticky="nesw")
bottom_frame.grid(row=2, sticky="nesw")
#create scrollbar
sb1 = tk.Scrollbar(top_frame,orient="vertical")
sb1.grid(row=0,column=5)
sb2 = tk.Scrollbar(top_frame,orient="horizontal")
sb2.grid(row=1,columnspan=5)
# create the widgets for the top frame
listBox = tk.Listbox(top_frame, relief="sunken",bd=2,selectmode="single")
# layout the widgets in the top frame
top_frame.grid_rowconfigure(0,weight=1)
top_frame.grid_columnconfigure(0,weight=1)
listBox.grid(row=0,sticky="nesw",columnspan=5)
#populate listbox
listBox.delete(0, "end")
for values in range(100):
listBox.insert("end", values)
#attach scrollbar to listbox
listBox.configure(xscrollcommand=sb1.set)
sb1.configure(command=listBox.yview)
listBox.configure(yscrollcommand=sb2.set)
sb2.configure(command=listBox.xview)
root.mainloop()
Am I doing something wrong?
Many thanks.
I do not know how you got this to work in Linux with tkinter, but anyway you are setting the scrollbar for the wrong axis.
listBox.configure(yscrollcommand=sb1.set) # Was xscrollcommand
sb1.configure(command=listBox.yview)
listBox.configure(xscrollcommand=sb2.set) # Was yscrollcommand
sb2.configure(command=listBox.xview)
Then you also need the scrollbar to expand along its field, with grid you use sticky, if you were using pack then an appropriate combination of fill and side, sometimes expand too:
sb1 = tk.Scrollbar(top_frame,orient="vertical")
sb1.grid(row=0,column=5,sticky='ns') # Expand north to south
sb2 = tk.Scrollbar(top_frame,orient="horizontal")
sb2.grid(row=1,columnspan=5,sticky='ew') # Expand east to west
I also hope you have a good reason to use columnspan=5 and did not get it confused with column. Ideally in this situation, it should be column 1 and 0 for sb1 and sb2 respectively.

How to add two widgets in a tk.Frame located inside a tk.Canvas?

I'm trying to do a scrollable application with two buttons. Pressing one of those buttons should be put a new button in the Frame, and scroll the widgets inside the frame.
My question is how to put the two buttons in the frame?
when I try to put in the same Frame only I can see one button and only a small part of the other.
How to solve this?
from tkinter import * # from x import * is bad practice
global y
y=0
def _configure_interior(event):
print("hola")
size = (interior.winfo_reqwidth(), interior.winfo_reqheight())
canvas.config(scrollregion="0 0 %s %s" % size)
def newbutton():
buttons=Button(interior, text="Button ")
buttons.pack()
#b2.place(y=50)
root =Tk()
#configuring the Scrollbars
vscrollbar = Scrollbar(root, orient=VERTICAL)
vscrollbar.pack(fill=Y, side=RIGHT)
hscrollbar = Scrollbar(root, orient=HORIZONTAL)
hscrollbar.pack(fill=X, side=BOTTOM)
#setting canvas with scrollbar
canvas = Canvas(root,height=500, width=500, bg="blue",
yscrollcommand=vscrollbar.set,xscrollcommand=hscrollbar.set)
canvas.propagate(0)
vscrollbar.config(command=canvas.yview)
hscrollbar.config(command=canvas.xview)
canvas.pack()
#making a interior scrolleable frame
interior = Frame(canvas,bg='black',height=600,width=600)
interior.pack(side="top", fill="both", expand=True)
#adding some widgets to the Frame
b=Button(interior, text="Button 2",command=newbutton)
b.pack()
b2=Button(interior, text="Button 2",command=newbutton)
b2.pack()
b2.place(x=50,y=50)
interior_id = canvas.create_window(30,30, window=interior,
anchor=NW)
interior.bind('<Configure>', _configure_interior)
root.mainloop()
You have also used pack() to place the interior frame on the canvas, which does not work. I've commentet that line out in the code below. Also I've commented out the b2.place() as you should not use more tham one geometry manager in a frame.
#making a interior scrolleable frame
interior = Frame(canvas,bg='black',height=600,width=600)
#interior.pack(side="top", fill="both", expand=True)
interior_id = canvas.create_window(30,30, window=interior,
anchor=NW)
#adding some widgets to the Frame
b=Button(interior, text="Button 2",command=newbutton)
b.pack()
b2=Button(interior, text="Button 2",command=newbutton)
b2.pack()
#b2.place(x=50,y=50)
The new buttons are now packed into interior.

Tkinter: Placing the Labels one after another in Canvas relatively.

I would like to arrange the Labels in the canvas one after another. But placement is not coming out as desired.
Below is the function that inserts the labels in the canvas. But the ones in the for loop overlaps. Reason - some labels are larger in size than the other. Hence, I assume that largest size be 80 and do the placements respectively. I would like to change this type of approach. Rather I want the labels to be placed relatively one after the other.
def calculate(*args):
try:
ttk.Label(canvas, text="Result:").place(x=20, y=20)
ttk.Label(canvas, text="Topic:").place(x=20, y=80)
ttk.Label(canvas, textvariable=topic).place(x=200, y=80)
ttk.Label(canvas, text="Environment:").place(x=20, y=120)
ttk.Label(canvas, textvariable=environment).place(x=200, y=120)
ttk.Label(canvas, text="Event Results:").place(x=20, y=160)
inputValue=TextArea.get("1.0","end-1c")
len_max=0
result={}
for s in inputValue.splitlines():
data = MainInstance.searchWithPayload(s)
result[s]=data
if len(s+data) > len_max:
len_max = len(s+data)
i = 190
for key in result.keys():
print(key)
print(result[key])
ttk.Label(canvas, text=key+"\n\n"+result[key], wraplength=800).place(x=20,y = i)
i = i + 80
except ValueError:
pass
Below is the code that integrates the canvas widget. And the calculate button calls the calculate function.
ttk.Button(page2, text="Exit",command=page1.quit).grid(column=2, row=8)
ttk.Button(page2, text="Calculate", command=calculate).grid(column=3, row=8)
canvas = Canvas(root, width=900, height=universal_height)
canvas.grid(column=1, row=0)
root.mainloop()
Actually, there are two parts of the question:
How can I relatively place the label to stop the overlapping?
I tried adding the scroll to the canvas. But the application does not respond and does not pop up.
Code for adding the scrollbar:
canvas=Canvas(root,bg='#FFFFFF',width=300,height=300,scrollregion=
(0,0,500,500))
hbar=Scrollbar(root,orient=HORIZONTAL)
hbar.pack(side=BOTTOM,fill=X)
hbar.config(command=canvas.xview)
vbar=Scrollbar(root,orient=VERTICAL)
vbar.pack(side=RIGHT,fill=Y)
vbar.config(command=canvas.yview)
canvas.config(width=300,height=300)
canvas.config(xscrollcommand=hbar.set, yscrollcommand=vbar.set)
canvas.pack(side=LEFT,expand=True,fill=BOTH)
This is the output that I am getting, wherein the first two labels are getting overlapped.
If you want to scroll the widgets that you put inside the canvas, you need to use canvas.create_window(x, y, window=label) instead of label.place(...).
I suggest you to create a frame, grid all you labels inside it so that you won't have overlapping issues and put the frame inside the canvas using create_window to be able to scroll it:
import tkinter as tk
from tkinter import ttk
def on_resize(event):
"""Resize canvas scrollregion when the canvas is resized."""
canvas.configure(scrollregion=canvas.bbox('all'))
root = tk.Tk()
root.geometry('100x100')
root.columnconfigure(0, weight=1)
root.rowconfigure(0, weight=1)
canvas = tk.Canvas(root)
frame = ttk.Frame(canvas)
# create and grid the labels
for i in range(3):
for j in range(3):
ttk.Label(frame, text="Label %i-%i" % (i, j)).grid(row=i, column=j, padx=10, pady=10)
# put the frame in the canvas
canvas.create_window(0, 0, anchor='nw', window=frame)
# add the scrollbars
vbar = ttk.Scrollbar(root, orient='vertical', command=canvas.yview)
hbar = ttk.Scrollbar(root, orient='horizontal', command=canvas.xview)
canvas.configure(xscrollcommand=hbar.set,
yscrollcommand=vbar.set,
scrollregion=canvas.bbox('all'))
canvas.grid(row=0, column=0, sticky='eswn')
vbar.grid(row=0, column=1, sticky='ns')
hbar.grid(row=1, column=0, sticky='ew')
canvas.bind('<Configure>', on_resize)
root.mainloop()

Tkinter window in canvas doesn't fill its parent in height

I would like to have my scrollbar in the bottom of the frame and my text widgets filling the whole frame above the scrollbar. I found some solution about the width configuration here but when I try to replace width with height, it does not work correctly.
from tkinter import *
from tkinter import ttk
class MainView(Frame):
def FrameHeight(self, event):
canvas_height = event.height
self.canvas.itemconfig(self.canvas_frame, height=canvas_height)
def OnFrameConfigure(self, event):
self.canvas.config(scrollregion=self.canvas.bbox("all"))
def __init__(self, *args, **kwargs):
Frame.__init__(self, *args, **kwargs)
self.grid_columnconfigure(0, weight=1)
self.grid_rowconfigure(0, weight=1)
sensorsFrame = Frame(self)
sensorsFrame.grid(row=0, sticky="nsew")
sensorsFrame.grid_columnconfigure(0, weight=1)
sensorsFrame.grid_rowconfigure(0, weight=1)
self.canvas = Canvas(sensorsFrame)
self.sensorsStatsFrame = Frame(self.canvas)
self.canvas.grid_rowconfigure(0, weight=1)
self.sensorsStatsFrame.grid_rowconfigure(0, weight=1)
myscrollbar = Scrollbar(sensorsFrame,orient=HORIZONTAL,command=self.canvas.xview)
self.canvas.configure(xscrollcommand=myscrollbar.set)
self.canvas.pack(fill=BOTH, expand=1)
myscrollbar.pack(fill=X, expand=1)
test0 = Text(self.sensorsStatsFrame, state=DISABLED)
test1 = Text(self.sensorsStatsFrame, width=150)
test0.grid(column=0, row=0, sticky="nsew")
test1.grid(column=1, row=0, sticky="nsew")
self.canvas_frame = self.canvas.create_window((0,0),window=self.sensorsStatsFrame,anchor='nw')
self.sensorsStatsFrame.bind("<Configure>", self.OnFrameConfigure)
#When I try to use what i found
#self.canvas.bind('<Configure>', self.FrameHeight)
if __name__ == "__main__":
root = Tk()
main = MainView(root)
main.pack(fill="both", expand=1)
root.wm_geometry("1100x500")
root.wm_title("MongoDB Timed Sample Generator")
root.mainloop()
Step 1: Remove space above and below the scrollbar
The expand option determines how tkinter handles unallocated space. Extra space will be evenly allocated to all widgets where the value is 1 or True. Because it's set to 1 for the scrollbar, it is given some of the extra space, causing the padding above and below the widget.
What you want instead is for all of the space to be allocated only to the canvas. Do this by setting expand to zero on the scrollbar:
myscrollbar.pack(fill=X, expand=0)
Step 2: call a function when the canvas changes size
The next problem is that you want the inner frame to grow when the canvas changes size, so you need to bind to the <Configure> event of the canvas.
def OnCanvasConfigure(self, event):
<code to set the size of the inner frame>
...
self.canvas.bind("<Configure>", self.OnCanvasConfigure)
Step 3: let the canvas control the size of the inner frame
You can't just change the size of the inner frame in OnCanvasConfigure, because the default behavior of a frame is to shrink to fit its contents. In this case you want the contents to expand to fit the frame rather than the frame shrink to fit the contents.
There are a couple ways you can fix this. You can turn geometry propagation off for the inner frame, which will prevent the inner widgets from changing the size of the frame. Or, you can let the canvas force the size of the frame.
The second solution is the easiest. All we have to do is use the height of the canvas for the frame height, and the sum of the widths of the inner text widgets for the frame width.
def OnCanvasConfigure(self, event):
width = 0
for child in self.sensorsStatsFrame.grid_slaves():
width += child.winfo_reqwidth()
self.canvas.itemconfigure(self.canvas_frame, width=width, height=event.height)
Step 4: fix the scrollbar
There's still one more problem to solve. If you resize the window you'll notice that tkinter will chop off the scrollbar if the window gets too small. You can solve this by removing the ability to resize the window but your users will hate that.
A better solution is to cause the text widgets to shrink before the scrollbar is chopped off. You control this by the order in which you call pack.
When there isn't enough room to fit all of the widgets, tkinter will start reducing the size of widgets, starting with the last widget added to the window. In your code the scrollbar is the last widget, but if instead you make it the canvas, the scrollbar will remain untouched and the canvas will shrink instead (which in turn causes the frame to shrink, which causes the text widgets to shrink).
myscrollbar.pack(side="bottom", fill=X, expand=0)
self.canvas.pack(fill=BOTH, expand=1)
Changing pack layout to grid layout for self.canvas and myscrollbar makes it work.
from tkinter import *
from tkinter import ttk
class MainView(Frame):
def FrameHeight(self, event):
canvas_height = event.height
self.canvas.itemconfig(self.canvas_frame, height = canvas_height)
def OnFrameConfigure(self, event):
self.canvas.config(scrollregion=self.canvas.bbox("all"))
def __init__(self, *args, **kwargs):
Frame.__init__(self, *args, **kwargs)
self.grid_columnconfigure(0, weight=1)
self.grid_rowconfigure(0, weight=1)
sensorsFrame = Frame(self)
sensorsFrame.grid(row=0, sticky="nsew")
sensorsFrame.grid_rowconfigure(0, weight=1)
sensorsFrame.grid_columnconfigure(0, weight=1)
self.canvas = Canvas(sensorsFrame, bg="blue")
self.sensorsStatsFrame = Frame(self.canvas)
self.canvas.grid_rowconfigure(0, weight=1)
self.sensorsStatsFrame.grid_rowconfigure(0, weight=1)
myscrollbar = Scrollbar(sensorsFrame,orient=HORIZONTAL,command=self.canvas.xview)
self.canvas.configure(xscrollcommand=myscrollbar.set)
self.canvas.grid(row=0, sticky="nsew")
myscrollbar.grid(row=1, sticky="nsew")
test0 = Text(self.sensorsStatsFrame, state=DISABLED, bg="red")
test1 = Text(self.sensorsStatsFrame, width=150)
test0.grid(column=0, row=0, sticky="nsew")
test1.grid(column=1, row=0, sticky="nsew")
self.canvas_frame = self.canvas.create_window((0,0),window=self.sensorsStatsFrame,anchor='nw')
self.sensorsStatsFrame.bind("<Configure>", self.OnFrameConfigure)
self.canvas.bind('<Configure>', self.FrameHeight)
if __name__ == "__main__":
root = Tk()
main = MainView(root)
main.pack(fill="both", expand=1)
root.wm_geometry("1100x500")
root.wm_title("MongoDB Timed Sample Generator")
root.mainloop()

python tkinter canvas size using scrollbar

Edited: I want the size of canvas1 to be adjusted using scrollbar. When I run this, only canvas1 is visible no place left on frame for canvas2. I want canvas1's size on the frame to be somewhere near 300*400 and when I scroll it to visualize the whole frame (1000*800)
I want to construct a frame with two canvas. but the problem is that i dont know how to fit first canvas within the scrollbar. In the following code the size of canvas is huge because of that the second canvas is not displayed in the frame. What i want is to fix the size of first canvas within the scrollbar. Am new to tkinter so have no idea how to do that
i will really appreciate your help
root=Tk()
master=Frame(root,width=300,height=300)
master.grid(row=0,column=0)
xscrollbar = Scrollbar(master, orient=HORIZONTAL)
xscrollbar.grid(row=1, column=0, sticky=E+W)
yscrollbar = Scrollbar(master)
yscrollbar.grid(row=0, column=1, sticky=N+S)
canvas1=Canvas(master, width=1000, height=800, background='white',xscrollcommand=xscrollbar.set,yscrollcommand=yscrollbar.set)
canvas1.grid(row=0,column=0, sticky=N+S+E+W)
xscrollbar.config(command=canvas1.xview)
yscrollbar.config(command=canvas1.yview)
canvas2=Canvas(master, width=100, height=200, background='pink',xscrollcommand=xscrollbar.set,yscrollcommand=yscrollbar.set)
canvas2.grid(row=2,column=0)
mainloop()
What you want to do is set the canvas size to be 300x400, and then set the scrollregion attribute of the canvas to be 1000*800.
canvas1 = Canvas(..., width=300, height=400, scrollregion=(0,0,1000,800))

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