WPF binding techniques, including binding to the property of another control etc. This means that you can use all of the cool Just like a regular DataTrigger, the MultiDataTrigger is cool because it uses bindings to monitor a property. In the Setters section, we define the properties we wish toĬhange when all the conditions are met - in this case, just the one (background color). This trigger has two conditions, but we could easily have added more if needed. Developer documentation for all DevExpress products. The image specified by the TreeListNode.Image property overrides the image obtained from the NodeImageSelector. This property specifies the field name in a data source that contains node images. In this example, we use a trigger to change the background color of the TextBox once it has keyboard focus AND the mouse cursor is over it, as seen on the Use the TreeViewControl.ImageFieldName property to obtain images from a data source. AllowMRUFilterList: Not supported in the TreeViewControl. Let's start with a quick example on how to use the MultiTrigger. Gets or sets whether the GridControl recalculates data shaping operations (for example, data sort and filter, summary calculation, and scrollbar annotation display) when you modify a data source outside the grid. There are two types of multi triggers: The MultiTrigger, which just like the regular Trigger works on dependency properties, and then the MultiDataTrigger, which works by binding to any kind of property. Triggers, which can monitor two or more property conditions and only trigger once all of them are satisfied. So far they have all been based on a single property, but WPF also supports multi In the previous chapter, we worked with triggers to get dynamic styles. Set the GridControl‘s name to PART_GridControl.Styles: WPF MultiTrigger and MultiDataTrigger.Use the PopupBaseEdit.PopupContentTemplate property to specify a custom GridControl.Set the LookUpEdit.AutoPopulateColumns property to false.Unlike a treeview, the TreeList control supports multi-column display of hierarchical data. Our WPF TreeList displays self-referenced (flat) or hierarchical data structures within a tree-like UI metaphor. This example shows how to customize the GridControl displayed in the LookUpEdit‘s popup window. Download your free 30-day trial today and see why your peers consistently vote DevExpress 1. To manually customize a data grid and embed it within the look-up editor, use the PopupBaseEdit.PopupContentTemplate property. The GetGridControl() method returns a data grid embedded in the editor’s drop-down window. The EditNonEditableTemplate property specifies the editor template if you set the IsTextEditable property to false: The EditTemplate property allows you to define the edit box appearance. View Example: WPF LookUpEdit - Process New Values Customize the Edit Box To validate the new value, handle the BaseEdit.Validate event. To respond to editor value changes, handle the BaseEdit.EditValueChanged event. The TextEditBase.Text property gets the text displayed within the lookup editor’s text box. Use the BaseEdit.EditValue property to get the editor’s value. Otherwise, the LookupEdit substitutes your columns with the automatically generated ones. End users can modify filters that you set using the FilterCriteria and DataControlBase.FilterString properties. Use the DataControlBase.ClearColumnFilter method to clear the required column’s filter. If you create columns manually for the embedded grid, set the AutoPopulateColumns property to false to disable automatic column generation. Use the DataControlBase.MergeColumnFilters method to apply a filter to a column (s) preserving the grid’s filter (if applied). The editor automatically generates columns for all the bound data object’s public properties. Private Set(ByVal value As ObservableCollection(Of Customer)) Public Property Customers As ObservableCollection(Of Customer) Private _Customers As (Of LookupEditDemo.Customer)ĭim people As ObservableCollection(Of Customer) = New ObservableCollection(Of Customer)() Public partial class MainWindow : Window
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