I am very new to WPF and developing first form in WPF as I have some specific design and feature requirement in tree-view.
I need to develop a treeview where only root nodes should be indented as default while their treeviewitems should be start from same 0 position, no indentation needed.
Please refer below image for reference -
Kindly help me to get it done by sharing any solution.
Either use Grouping with datagrid it will give somewhat following output:
Or can use RadTreeListView like control. More details can be found here.
As per comment if you have to use the treeview only then you have to override the templates. You can refer the following post:
Decrease indentation in TreeViewItem for deepest node
WPF Tree view, how to change indention
Related
I have a requirement in that i need to display items of treeview in a below specified pattern. Here i have a treeview with three levels. I need custom style for all three levels. Could you please help me...
You can create a custom style for TreeViewItems and TreeView, this would give you the ability to design your own UI for the control.
The link below shows what controls you would need to style.
https://msdn.microsoft.com/en-us/library/ms752048(v=vs.110).aspx
From the image you posted, it looks pretty straight forward. You can just have your own HierarchicalDataTemplate and DataTemplate for your nodes. Take a look at example here.
However if you want a great control on node's layout and behaviour then creating a custom ControlTemplate for the TreeViewItem is your best bet. There are many nice articles over internet. May be you can follow this one here.
I am currently looking for a control that allows me to show only few informations when the control is fold. And when we click on the control, the control is unfold and all the information of the control are showed. I have checked if I could use ListView but I did not see a match and the TreeView does not fit my will because it's not a child node but the same node showed in a different way.
Can you help me find a control that could fit my needs ?
Thanks in advance.
You could look into the Expander control. You can modify the control template to customize how it looks and behaves.
In my application as soon as an object is dropped on canvas I stored it in a tree. Now, I'm trying to write a method to delete an object which is fine but I also need to delete that specific object from the tree. Each object has a unique id so this way I can find it in tree and remove it from tree while being deleted from the canvas.
In order to find a node in tree I have planned to store ID in each node (item.Tag), however, I'm facing two problems:
How can I access to details of a node from a different class? myTreeObj.Items.Tag doesn't work properly.
When I loop in tree myTreeObj.Items.Count shows more items that what I see.
Any comments will be appreciated.
Thanks.
In WPF, TreeViews are actually what they say they are: a view of a data structure. In WinForms, you had to crawl up and down the nodes of a TreeView and add them or remove them manually. In WPF, the proper approach is to add or remove items from the actual data hierarchy (to which the TreeView is binding) and use PropertyChanged or CollectionChanged notifications to tell the TreeView to update itself automatically.
What you are trying to do may be possible, but it is going to be an uphill fight all the way, and things will not work as expected. WPF REALLY wants you to use databinding, and any other approach is going to give you headaches.
This article may be a helpful place to start understanding how to work with the WPF TreeView:
http://joshsmithonwpf.wordpress.com/2008/05/24/the-wpf-treeview-is-a-view-of-a-tree/
EDIT:
The author's original article is actually more helpful:
http://www.codeproject.com/Articles/26288/Simplifying-the-WPF-TreeView-by-Using-the-ViewMode
I'm using WPF TreeView bound to my classes though MVVM to display a large array of multilevel data. Because of this, when I expand TreeNode, it takes some time and a lot of memory.
I think, that the memory requirement comes from TreeView scouting out nodes down the line, not just the first generation of the children, forcing those nodes to load data.
Is there any way to limit this "scouting" behavior to only the first generation of child nodes?
WPF generates TreeViewItem(s) only when they are displayed, i.e. no item is generated until its Parent expanded. So, I think the problem is not a "scouting".
Anyway, you may try to implement dynamic loading in your ViewModel by adding synchronization with TreeViewItem.IsExpanded using TwoWay Binding. Take a look at this. You may use the same solution for IsExpanded property. Don't forget to add fake item to tell TreeViewItem that it is expandable.
Check if TreeView is using VirtualizingStackPanel. I believe that it is used by default in .NET 4.0, but you must set it explicitly in previous .NET versions.
For more information, see How to: Improve the Performance of a TreeView.
I am using the standard asp.net treeview control to display a menu structure that is getting bound from a database. The data structure has a parentID column to represent the node relationship if one exists.
Anyway, that's not an issue, I am looking for a treeview control that would allow a user to rearrange the node by dragging them to a new position within the tree. Can anyone point me in the right direction as to any controls out there that can do this? The windows form control has the move node events. IS there something like this for web forms? Any pointers greatly appreciated.
You can have look at ExtJS TreePanel.
Drag and Drop ordering in a TreePanel
Why not try the JQuery TreeView plug-in?
http://plugins.jquery.com/project/treeview
Not sure if meets all of your non-functional requirements, but if you click on the "Try out a demonstration" link, you should be able to see if it meets your needs.