treeview

How to change the foreground or background colour of a selected cell in tkinter treeview?

by

@BryanOkley shared that one cannot change the color of an individual cell in ttk.Treeview. So I explored using tk.Canvas() and tk.Canvas.create_text() to create the illusion of changing the color of a selected cell in a ttk.Treeview() widget. I was fortunate to come by j08lue/ttkcalendar.py which had the same objective and I adapted from it. My … Read more

Recursive TreeView in ASP.NET

by

I think this should get you started. I created a MyObject class to mimic your object . public class MyObject { public int Id; public int ParentId; public string Name; } Here is a method to recursivley add tree view nodes based on the list. protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { … Read more

TreeView with columns

by

There are a number of sample controls to be found around the web: TreeViewAdv for .Net TreeView with Columns ContainerListView and TreeListView But the all-time favorite is probably the ObjectListView, which provides an expandable, multi-column ListView, along with many other incredibly handy features:    

Enumerating Collections that are not inherently IEnumerable?

by

This code should do the trick public static class Extensions { public static IEnumerable<T> GetRecursively<T>(this IEnumerable collection, Func<T, IEnumerable> selector) { foreach (var item in collection.OfType<T>()) { yield return item; IEnumerable<T> children = selector(item).GetRecursively(selector); foreach (var child in children) { yield return child; } } } } Here’s an example of how to use it … Read more

Treeview flickering?

by

The Begin/EndUpdate() methods were not designed to eliminate flicker. Getting flicker at EndUpdate() is inevitable, it repaints the control. They were designed to speed-up adding a bulk of nodes, that will be slow by default since every single item causes a repaint. You made it a lot worse by putting them inside the for loop, … Read more

WPF TreeView: How to style selected items with rounded corners like in Explorer

by

Adding to @Sheridan’s answer This isn’t a 100% accurate but should get you pretty close (it’s using the colors from GridView which is pretty close to Windows Explorer) <TreeView …> <TreeView.Resources> <LinearGradientBrush x:Key=”{x:Static SystemColors.HighlightBrushKey}” EndPoint=”0,1″ StartPoint=”0,0″> <GradientStop Color=”#FFD9F4FF” Offset=”0″/> <GradientStop Color=”#FF9BDDFB” Offset=”1″/> </LinearGradientBrush> <LinearGradientBrush x:Key=”{x:Static SystemColors.ControlBrushKey}” EndPoint=”0,1″ StartPoint=”0,0″> <GradientStop Color=”#FFEEEDED” Offset=”0″/> <GradientStop Color=”#FFDDDDDD” Offset=”1″/> </LinearGradientBrush> … Read more

tech