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GUI-Programming Articles
Page 3 of 25
How to add a column to a Tkinter TreeView widget?
Tkinter TreeView widget is used to present data in a hierarchical manner in the form of rows and columns. To create a Treeview widget, you have to first create a constructor of Treeview(master, column, show='headings') widget. Here, you can specify the list of columns and pass the value to the column parameter that you want to include in the table.The indexing of data in the Treeview widget starts from 0. Therefore, to avoid counting the first column, we need to use the show=heading parameter. Let us create an application to show a table with two columns "ID" and "Company" of ...
Read MoreHow to temporarily remove a Tkinter widget without using just .place?
To place Tkinter widgets inside a Frame or a Canvas, you can use various geometry managers. The geometry manager allows you to set the layout of the widget and how they will appear in the tkinter window. The place() method is one of the simplest geometry managers which is used to set the position of a widget relatively and explicitly to the window. We can also use the place() method to separate the widgets from each other, as it supports the relative property to position the widget with respect to others.In some cases, if you want to temporarily remove a ...
Read MoreHow to center a label in a frame of fixed size in Tkinter?
Tkinter is a GUI toolkit in Python used to build desktopbased applications. Tkinter provides several widget functionalities and class libraries to develop various components of an application. The Frame widget is one of the widgets that works similar to the standard tkinter default window. You can place as many widgets as you want in a Frame widget. You can also customize the properties like resizing the frame, its background color and also the layout using geometry managers.ExampleSuppose we need to create an application in which we want to create a Label widget inside a fixedsize frame. The Label widget must ...
Read MoreAsk a user to select a folder to read the files in Python
If you have ever wondered how the dialogboxes work in a Python application, then you probably end up hearing the filedialog module in Tkinter. The filedialog module contains a number of built-in functions which can be used to display various types of dialogs for dealing with files in the system.In most cases, we use the filedialog.askopenfilename() function to ask the user to browse and open a file from the system. Based on the selection of the filetype, the script is programmed to perform write or read operation.Once a file is opened, you can use the open(file, 'mode') function to open ...
Read MoreHow to get a string from a tkinter filedialog in Python 3?
To interact with the filesystem in a tkinter application, you can use the Tkinter filedialog module. It provides a way to deal with the files in the system. The filedialog module offers many built-in functions to help developers create a variety of file dialogs for the application. You can use any of the filedialog functions in order to implement a dialog in your application.The most commonly used function is filedialog.askopenfilename() which generally creates a dialog asking the user to open a file in the given program interface.ExampleSuppose we want to get a string or the filename which we open using ...
Read MoreHow to bind all the number keys in Tkinter?
While developing a Tkinter application, we often encounter cases where we have to perform some specific operation or event with the keystrokes (on keyboard). Tkinter provides a mechanism to deal with such events.You can use bind(, callback) function for each widget that you want to bind in order to perform a certain type of event. Whenever we bind a key with an event, the callback event occurs whenever a corresponding key is pressed.ExampleLet's consider an example. Using the bind("", callback) function, we can also bind all the number keys to display a message on the screen such that whenever a ...
Read MoreHow to make specific text non-removable in tkinter?
In Tkinter, users can input text using two basic text input widgets − the Text widget and the Entry widget. The Text widget is generally used to accept multiline user input, whereas in an Entry widget, the user can type only singleline text.You can customize these widgets and add additional functionality using built-in library functions and methods. To validate the input in an Entry widget, you can use the register() method. This method returns a string that can be used to call the function at later stages.To validate the input in an Entry widget, use the config(**options) method and pass ...
Read MoreHow to show multiple Canvases at the same time in Tkinter?
The Canvas widget is one of the versatile widgets in Tkinter which is used to create illustrations, draw shapes, arcs, images, and other complex layouts in an application. To create a Canvas widget, you'll need to create a constructor of canvas(root, **options).You can use the factory functions to create text, images, arcs and define other shapes in the canvas. In some cases, if you want to create another canvas using the same canvas to keep the application workflow consistent, then you can create a button to call an event that creates another canvas.To understand this, let us create a canvas ...
Read MoreGetting the Cursor position in Tkinter Entry widget
We are already familiar with input forms where various single Entry fields are created to capture the user input. With Tkinter, we can also create a single input field using the Entry widget. Each character in the Entry field that the user enters is indexed. Thus, you can retrieve this index to get the current position of the cursor by using the index() method. To retrieve the current location of the cursor, you can pass the INSERT argument in this function.Example# Import required libraries from tkinter import * from tkinter import ttk # Create an instance of tkinter window ...
Read MoreHow to specify the file path in a tkinter filedialog?
Tkinter offers several built-in functions and class library methods to build components and user-actionable items of an application. filedialog is one of the tkinter modules that provides classes and library functions to create file/directory selection windows. You can use filedialog where you need to ask the user to browse a file or a directory from the system.You can also specify the location of the directory from where a particular file should be picked up. To display the filedialog that starts from a particular location, use the initialdir = argument in the static factory function askopenfilename(initialdir=). This function creates a ...
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