■ BindableProperty 클래스의 CreateAttached 정적 메소드를 사용해 첨부 속성을 만드는 방법을 보여준다.
▶ NumericValidationBehavior.cs
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namespace TestProject; /// <summary> /// 숫자 검증 동작 /// </summary> public static class NumericValidationBehavior { //////////////////////////////////////////////////////////////////////////////////////////////////// Bindable Property ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 검증 적용 여부 속성 - ApplyValidationProperty /// <summary> /// 검증 적용 여부 속성 /// </summary> public static readonly BindableProperty ApplyValidationProperty = BindableProperty.CreateAttached ( "ApplyValidation", typeof(bool), typeof(NumericValidationBehavior), false, propertyChanged : ApplyValidationPropertyChangedCallback ); #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 검증 적용 여부 구하기 - GetApplyValidation(bo) /// <summary> /// 검증 적용 여부 구하기 /// </summary> /// <param name="bo">바인딩 객체</param> /// <returns>검증 적용 여부</returns> public static bool GetApplyValidation(BindableObject bo) { return (bool)bo.GetValue(ApplyValidationProperty); } #endregion #region 검증 적용 여부 설정하기 - SetApplyValidation(bo, value) /// <summary> /// 검증 적용 여부 설정하기 /// </summary> /// <param name="bo">바인딩 객체</param> /// <param name="value">검증 적용 여부</param> public static void SetApplyValidation(BindableObject bo, bool value) { bo.SetValue(ApplyValidationProperty, value); } #endregion //////////////////////////////////////////////////////////////////////////////// Private #region 검증 적용 여부 속성 변경시 콜백 처리하기 - ApplyValidationPropertyChangedCallback(bo, previousValue, newValue) /// <summary> /// 검증 적용 여부 속성 변경시 콜백 처리하기 /// </summary> /// <param name="bo">바인딩 객체</param> /// <param name="previousValue">이전 값</param> /// <param name="newValue">신규 값</param> private static void ApplyValidationPropertyChangedCallback(BindableObject bo, object previousValue, object newValue) { Entry entry = bo as Entry; if(entry == null) { return; } bool applyValidation = (bool)newValue; if(applyValidation) { entry.TextChanged += entry_TextChanged; } else { entry.TextChanged -= entry_TextChanged; } } #endregion #region 엔트리 텍스트 변경시 처리하기 - entry_TextChanged(sender, e) /// <summary> /// 엔트리 텍스트 변경시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private static void entry_TextChanged(object sender, TextChangedEventArgs e) { double result; bool isValid = double.TryParse(e.NewTextValue, out result); ((Entry)sender).TextColor = isValid ? Colors.Black : Colors.Red; } #endregion } |
▶ MainPage.xaml
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<?xml version="1.0" encoding="utf-8" ?> <ContentPage x:Class="TestProject.MainPage" xmlns="http://schemas.microsoft.com/dotnet/2021/maui" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:local="clr-namespace:TestProject"> <Entry HorizontalOptions="Center" VerticalOptions="Center" WidthRequest="200" local:NumericValidationBehavior.ApplyValidation="true" Placeholder="실수 값을 입력해 주시기 바랍니다." /> </ContentPage> |
