■ FrameworkElement 엘리먼트에서 XAML을 사용해 포커스를 설정하는 방법을 보여준다.
▶ FrameworkElementExtension.cs
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using System; using System.Windows; namespace TestProject; /// <summary> /// 프레임워크 엘리먼트 확장 /// </summary> public static class FrameworkElementExtension { //////////////////////////////////////////////////////////////////////////////////////////////////// Dependency Property ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 포커스 여부 속성 - IsFocusedProperty /// <summary> /// 포커스 여부 속성 /// </summary> public static readonly DependencyProperty IsFocusedProperty = DependencyProperty.RegisterAttached ( "IsFocused", typeof(bool?), typeof(FrameworkElementExtension), new FrameworkPropertyMetadata(IsFocusedPropertyChangedCallback) { BindsTwoWayByDefault = true } ); #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 포커스 여부 구하기 - GetIsFocused(d) /// <summary> /// 포커스 여부 구하기 /// </summary> /// <param name="d">의존 객체</param> /// <returns>포커스 여부</returns> public static bool? GetIsFocused(DependencyObject d) { if(d == null) { throw new ArgumentNullException("d"); } return (bool?)d.GetValue(IsFocusedProperty); } #endregion #region 포커스 여부 설정하기 - SetIsFocused(d, value) /// <summary> /// 포커스 여부 설정하기 /// </summary> /// <param name="d">의존 객체</param> /// <param name="value">값</param> public static void SetIsFocused(DependencyObject d, bool? value) { if(d == null) { throw new ArgumentNullException("d"); } d.SetValue(IsFocusedProperty, value); } #endregion //////////////////////////////////////////////////////////////////////////////// Private #region 프레임워크 엘리먼트 포커스 획득시 처리하기 - frameworkElement_GotFocus(sender, e) /// <summary> /// 프레임워크 엘리먼트 포커스 획득시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private static void frameworkElement_GotFocus(object sender, RoutedEventArgs e) { ((FrameworkElement)sender).SetValue(IsFocusedProperty, true); } #endregion #region 프레임워크 엘리먼트 포커스 상실시 처리하기 - frameworkElement_LostFocus(sender, e) /// <summary> /// 프레임워크 엘리먼트 포커스 상실시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private static void frameworkElement_LostFocus(object sender, RoutedEventArgs e) { ((FrameworkElement)sender).SetValue(IsFocusedProperty, false); } #endregion #region 프레임워크 엘리먼트 표시 여부 변경시 처리하기 - frameworkElement_IsVisibleChanged(sender, e) /// <summary> /// 프레임워크 엘리먼트 표시 여부 변경시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private static void frameworkElement_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e) { FrameworkElement frameworkElement = sender as FrameworkElement; if(frameworkElement.IsVisible && (bool)((FrameworkElement)sender).GetValue(IsFocusedProperty)) { frameworkElement.IsVisibleChanged -= frameworkElement_IsVisibleChanged; frameworkElement.Focus(); } } #endregion #region 포커스 여부 속성 변경시 콜백 처리하기 - IsFocusedPropertyChangedCallback(d, e) /// <summary> /// 포커스 여부 속성 변경시 콜백 처리하기 /// </summary> /// <param name="d">의존 객체</param> /// <param name="e">이벤트 인자</param> private static void IsFocusedPropertyChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e) { FrameworkElement frameworkElement = d as FrameworkElement; if(e.OldValue == null) { frameworkElement.GotFocus -= frameworkElement_GotFocus; frameworkElement.GotFocus += frameworkElement_GotFocus; frameworkElement.LostFocus -= frameworkElement_LostFocus; frameworkElement.LostFocus += frameworkElement_LostFocus; } if(!frameworkElement.IsVisible) { frameworkElement.IsVisibleChanged -= frameworkElement_IsVisibleChanged; frameworkElement.IsVisibleChanged += frameworkElement_IsVisibleChanged; } if((bool)e.NewValue) { frameworkElement.Focus(); } } #endregion } |
▶ MainWindow.xaml
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<Window x:Class="TestProject.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:TestProject" Width="800" Height="600" Title="TestProject" FontFamily="나눔고딕코딩" FontSize="16"> <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center"> <TextBox Width="200" Height="25" VerticalContentAlignment="Center" /> <TextBox Margin="0 10 0 0" Width="200" Height="25" local:FrameworkElementExtension.IsFocused="True" VerticalContentAlignment="Center" /> </StackPanel> </Window> |
