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To do that, the After Check event needs to be handled. To String()) ' Create a child nodes for this node Create Child Nodes(node, level 1) ' Add the node to the parent node parent Node. Add(node) Then by handling the After Check event, we will cycle through child and parent nodes and change the value of their check box.Here is how: At first you need to have a Tree View with some root nodes and child nodes in it. The Update Child method is used to change the check box value of the child nodes, while Update Parent method is used to change the check box value of the parent nodes.
This works really well, but it does leave you with one problem: Because each tree node is now represented by your custom class, for instance Family Member as we saw in the previous article, you no longer have direct control over Tree View node specific functionality like selection and expansion state. Tree View_control I'm sorry for the rather large amount of code in one place.Firstly, when we scroll down the list to the very end, the elements may not reach the bottom of the list or go beyond it.Of course, we could use a quick-and-dirty workaround, but instead we decided to create several elements at the top of the list, which collectively cover the scope. The following image illustrates the aforesaid approach. For example, this is what I use for my menu on the left of the page. This control is meant to show a tree of items and each item can have a link to it.It will affect only elements’ steadiness during scrolling, and, if the size of the elements does not differ drastically, it will be unnoticeable.
The first attempt to implement these ideas showed that there are additional aspects to be taken into account.In praxis this means that you can't select or expand/collapse a given node from code-behind. In a real world solution, it would obviously be spread out over multiple files instead and the data for the tree would likely come from an actual data source, instead of being generated on the fly. I have defined a couple of buttons to be placed in the bottom of the dialog, to use the two new properties.Lots of solutions exists to handle this, ranging from "hacks" where you use the item generators of the Tree View to get the underlying Tree View Item, where you can control the Is Expanded and Is Selected properties, to much more advanced MVVM-inspired implementations. Then we have the Tree View, for which I have defined an Item Template (as demonstrated in a previous chapter) as well as an Item Container Style.These two properties are then hooked up to the Tree View, using a couple of styles targeting the Tree View Item, inside of the Item Container Style for the Tree View. In the code-behind, I have defined a Person class, with a couple of properties, which inherits our extra properties from the Tree View Item Base class.You could easily implement these two properties on all of your objects, but it's much easier to inherit them from a base object. You should be aware that the Tree View Item Base class implements the INotify Property Changed interface and uses it to notify of changes to these two essential properties - without this, selection/expansion changes won't be reflected in the UI.If this is not feasible for your solution, you could create an interface for it and then implement this instead, to establish a common ground. The concept of notification changes are explained in the Data binding chapters.