![]() ![]() Gets or sets whether to display the MRU search button in the Search Panel. Gets or sets the search string specified in the Search Panel. Gets or sets whether to display the Search Panel. The TreeViewControl can display the Search Panel, which allows users to search and filter nodes. Occurs after the TreeViewControl has completed a sort operation.Īllows you to use custom rules to sort data. ![]() ![]() Occurs before the TreeViewControl starts a sort operation. Gets or sets how the TreeViewControl sorts its data. Gets or sets the field in a data source by which the TreeViewControl sorts its data. Gets or sets the TreeViewControl‘s sort order. This is a dependency property.Īllows you to validate the focused node’s data and specify whether to close the node’s editor. Gets or sets whether an editor that did not pass validation can lose focus. Gets or sets an object that contains the TreeViewControl editor’s settings. Gets or sets whether users can edit node values. The TreeViewControl uses an in-place editor that depends on its content. Gets the total number of nodes displayed in the TreeViewControl. Gets the total number of nodes stored in the TreeViewControl. Gets or sets whether to create nodes dynamically when you expand their parent node. Gets or sets a selector that returns the list of child nodes for the processed node. Gets or sets the name of the field that contains child nodes. Gets or sets the value that root nodes contain in the field specified by the ParentFieldName property. Gets or sets the name of the service field in a data source that contains parent node values. Gets or sets the name of the service field in a data source that contains unique values. Gets or sets the name of a data source field assigned to the TreeViewControl. The TreeViewControl can display information in a tree from a self-referential (flat) or hierarchical data structure. IsSelectionChangeActiveProperty.If you want to display multi-column data, use the TreeListControl. SelectedItems.ForEach(t=>t.IsSelected=true) then restore selection change notifications Var treeViewItem = treeView.SelectedItem as TreeViewItem TreeView.SelectedItemChanged += (a, b) => If (IsSelectionChangeActiveProperty=null) Public static void AllowMultiSelection(TreeView treeView) Private static readonly PropertyInfo IsSelectionChangeActivePropertyīindingFlags.NonPublic | BindingFlags.Instance) However the draw back is the use of the non public property, IsSelectionChangeActive, of the treeview class. The code below works fine and is much simpler. The top level code is located in MyTreeView_SelectedItemChanged function and called when SelectedItemChanged event is fired on the TreeView. If LeftCtrl key is pressed, the previous selections are not cleaned. If LeftCtrl key is not pressed, then, before selecting an item, we clean all the previous selections. The selected items change their Background and Foreground properties to Brushes.Black and Brushes.White correspondingly. The set is simulated by a Dictionary with null values. Simulating the Multi-SelectionĪs stated above, we disable the WPF selection and, instead use our own selection mechanism, according to which, all TreeViewItem elements that have been selected are stored in selectedItems set. The shift key and ctrl-A multi-select functions were not added (again for the lack of time), but can be added in exactly the same manner. To multi-select, you should use the left ctrl key on your keyboard together with the mouse. Ideally another user control called, say MultiSelectTreeView, should be created and packed in a separate DLL, but since I do not have much time to spend on it, I simply showed how to do it by modifying the code in the main Window class. I say "simulate" because it discards the WPF select mechanism and replaces it with its own. This article shows a very simple example that simulates multi-select capability for a WPF TreeView control. WPF TreeView control does not give developers an ability to multi-select the nodes of the tree. I plan to write another article that will incorporate the samples from my earliest articles making them work. Note - this is one of my earliest articles and I cannot guarantee that the sample is working and the presentation is clear. ![]()
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