I have a treeview (TVWDB) which has several node, children and grandchildren. Depending on the user these can be shown as just the parent node, or with the children or even grandchildren displayed.
The user steps through this using a button which advances down the tree at the level they have selected (ie if a child is selected then it will step through each child).
Im looking for a way that when the selected item drops down that node is shown at the top of the tree (if there are parents then it should actually be the parent node which is shown.
I keep looking at .Ensurevisible and Getvisible count but this seems to work on the 1st attempt but then start jumping around on each subsequent advance.
Related
I am wondering what would be a stable algorithm that can determine a length of a scrollable carousel.
For example i have a view with left andright button that can go through the whole collection of items.
The items can be repetitive and non-unique. For example :
A<->B<->C<-D->A<->B<->C<->H<->G ( G is connected to A with <->)
Using a bot that can inspect the state and click,
how many times i need to go through the whole list to determine that is the final one ?
thanks
Per the screenshots the price 84.6 repeats itself on the winform, but the underlying treeview has exactly the right nodes (only one)
There is not an explicit binding, just play around with updating nodes. What is going on?
The code is just simple TreeNode tn = new TreeNode(); and add some numbers, etc.
The updates to the code are just not getting into the display, but there's no specific binding.
To solve this I had to first of all convert the nodes to a List<TreeNode>
List<TreeNode> tnl = historyTree.TopNode.Nodes.Cast<TreeNode>().ToList();
Then after organising the nodes as required I had to clear the treeview of all nodes and add in the list of nodes
historyTree.BeginUpdate();
historyTree.TopNode.Text = q.Name;
historyTree.TopNode.Nodes.Clear();
historyTree.TopNode.Nodes.AddRange(tnl.ToArray());
historyTree.EndUpdate();
I'm looking to implement a cut and paste method to replace drag and drop in a TreeView control. Drag and drop no longer works in the TreeView, and I believe cut and paste will be easier for the people using it. In this TreeView, I will be working with cutting only the child nodes. This object has only parent and child nodes (parent being dates and child nodes being purchase orders.) I'm not sure if there is a cut property and/or paste property to use with treeview1.node.selected or whatever I need to use.
... upon clicking cut it copies the selected node to copynode. then remove the selected node.
so the node is stored in the copynode slot
This won't work as copynode is a reference to the thing you just removed (destroyed) so after removal copynode will point to Nothing.
Instead; when a cut event occurs store the key features of the cut node (text, key, icon index etc.) in to a module level user defined type (or delimited string/class/series of variables) and remove the node. You can then use this data as the basis to construct a new node when a paste event is raised.
(The cut/paste events are not bound to the windows clipboard, rather thay are your own inventions based upon a context menu/detection of ctrl+X/V)
im not sure how to check if the node has children when im pasting to it
if tv.SelectedItem.Children > 0 then
... got child nodes
I have created a tree diagram based on http://i.stack.imgur.com/17hpU.jpg
I would like to add a feature which will highlight the path upto root node when any node is selected. As I am new and not know how to define a root as well as how to highlight the path. could someone give some useful links on how to achieve that?
I'm trying to ajax load the p:tree component. The idea is to mimic the tree of a windows file system. When I click the expand icon of a node, I make a call to a service which returns list of directories under that directory node. I then simply add these new directories as child nodes of the node which was expanded. I can successfully add child nodes to a node, however, I need to see the expand icon beside every new node being added. This is not happening for me. Any child nodes I add render without the expand icon and thus I am unable to go deeper into the tree.
Furthermore, it seems that PF tree component will only display the expand icon it the node has one or more children. However, in my case, I don't know whether a node will have children or not until that node is expanded.
The source code is available at the PimeFaces forum, I am opening this question in the hopes of getting a few more eyes looking at it.
http://forum.primefaces.org/viewtopic.php?f=3&t=34819
I have managed to find a workaround for this.
Everytime I add a new node anywhere on the tree, add a 'dummy' node to it. This will ensure that every new node added will get the expand icon beside. Now, when clicking the expand icon on a node, the backing bean will remove all children and add the real nodes.
There is probably a better way of doing this so I am open to other suggestions but for the time being this will do its job.