![]() Setting a visual property only has an effect if that property is both present in the control's default template and is set by using a TemplateBinding. ![]() The default style is determined by which desktop theme is used when the application is running. If a property is set by a default style, the property might change from its default value when the control appears in the application. To see the parts and states that are specific to the TreeViewItem, see TreeView Styles and Templates.ĭependency properties for this control might be set by the control's default style. For more information about creating a ControlTemplate, see Customizing the Appearance of an Existing Control by Creating a ControlTemplate. You can modify the default ControlTemplate to give the control a unique appearance. To apply the same property settings to multiple TreeViewItem controls, use the Style property. To expand or collapse a TreeViewItem, use the IsExpanded property.įor more information about the TreeView control, see the TreeView Overview. The following illustration shows a hierarchy of TreeViewItem controls inside a TreeView. TreeViewItem controls can be embedded inside other TreeViewItem controls to create a hierarchy of nodes inside a TreeView control. For more information, see the HeaderedItemsControl class. TreeViewItem is a HeaderedItemsControl, which means its header and collection of objects can be of any type (such as string, image, or panel). The following example shows how to create a hierarchy of TreeViewItem controls in a TreeView control. IHierarchicalVirtualizationAndScrollInfo Examples Implements IHierarchicalVirtualizationAndScrollInfo Inheritance Inherits HeaderedItemsControl Public Class TreeViewItem Interface IHierarchicalVirtualizationAndScrollInfo Public Class TreeViewItem Interface VirtualizingStackPanel.IProvideStackingSize Public class TreeViewItem :, .IHierarchicalVirtualizationAndScrollInfo public ref class TreeViewItem : System::Windows::Controls::HeaderedItemsControl public ref class TreeViewItem : System::Windows::Controls::HeaderedItemsControl, System::Windows::Controls::Primitives::IHierarchicalVirtualizationAndScrollInfo If(textbox1.Implements a selectable item in a TreeView control. For example: UserContrl1_LOadDataMethod() Textbox1.Invoke(new MethodInvoker(delegate )) ĭo your serious processing in the separate thread before you attempt to switch back to the control's thread. The solution you want then should look like: UserContrl1_LOadDataMethod() So only accessing the value so that corresponding data can be fetched from the database. I'm not going to do it ever from a child thread. I don't want to change the value of a control from the child thread. Situation is this: I want to load data into a global variable based on the value of a control. I guess I have not presented the question properly. This is the code I refereced before I wrote my own: Social MSDN: Show TreeView nodes connected with dotted linesĪs per Prerak K's update comment (since deleted): You may suggest me change Vertical Line size, but if you change the font size, too, it will not work. There is a problem with vertical line when you add a TreeViewItem into TreeView: As I'm a newbie in WPF, I don't know to style these line perfectly. To make these lines dotted, change: īut it is not pretty, as you see. In WinForms TreeView, the connecting lines is a dotted lines. The full trigger can found on attached file. You can add more trigger to control behavie of TreeView if you want. The TreeView will have WinForms style now. Public object ConvertBack(object value, Type targetType, object parameter, culture)Īdd trigger to TreeViewItem template, this trigger changes the connecting lines if the item is the last in the list: Return ic.ItemContainerGenerator.IndexFromContainer(item) = ic.Items.Count - 1 ItemsControl ic = ItemsControl.ItemsControlFromItemContainer(item) Public object Convert(object value, Type targetType, object parameter, culture) This Class will changes the connecting lines if the item is the last in the list: using System Ĭlass TreeViewLineConverter : IValueConverter Then you need put the class TreeViewLineConverter to your namespace. To your TreeViewItem template like this: Then, you need draw vertical and horizontal connecting lines between nodes: You need redesign TreeViewItem Control. In above code, you can see a trigger, it will make the vertical line inside toggle button hide if item is expand, or show if its children collapsed. When TreeViewItem is expanded, the vertical line will hide: All you need to do is a XAML file and a code behind:įirst you need draw Toggle Button: From Triangle button to Plus-Minus button: draw a rectangle with dark border, then draw two lines, one vertical line and one horizontal line.
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