FocusHelper
in wpf with mvvm is not easy top set focus at element with binding
FocusHelp is made for simplify this
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public class FocusHelper { #region Set public static bool GetSet(DependencyObject obj) => (bool)obj.GetValue(SetProperty); public static void SetSet(DependencyObject obj, bool value) => obj.SetValue(SetProperty, value); public static readonly DependencyProperty SetProperty = DependencyProperty.RegisterAttached("Set", typeof(bool), typeof(FocusHelper), new PropertyMetadata(false ,(ss,ee) => { if(ss is UIElement element && ee.NewValue is bool b && b) { element.Focus(); SetSet(element, false); } })); #endregion } |
and adding to a focusable control
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<TextBox Text="{Binding Nom, UpdateSourceTrigger=PropertyChanged}" local:FocusHelper.Set="{Binding SetFocus}"/> |
and use like this
in your datacontext object
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#region SetFocus private bool _SetFocus = false; public bool SetFocus { get => _SetFocus; set { _SetFocus = value; OnPropertyChanged(); } } #endregion |
and code for setting focus
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SetFocus = true; |
when the set focus is set to true, the UIElement receive Focus(); and the helper re-set Binding value to False
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