■ INotifyPropertyChanged 인터페이스를 사용해 HSL 색상 뷰 모델을 바인딩하는 방법을 보여준다.
▶ HSLColorViewModel.cs
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using System.ComponentModel; namespace TestProject; /// <summary> /// HSL 색상 뷰 모델 /// </summary> public class HSLColorViewModel : INotifyPropertyChanged { //////////////////////////////////////////////////////////////////////////////////////////////////// Event ////////////////////////////////////////////////////////////////////////////////////////// Public #region 속성 변경시 - PropertyChanged /// <summary> /// 속성 변경시 /// </summary> public event PropertyChangedEventHandler PropertyChanged; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 색조 /// </summary> private float hue; /// <summary> /// 채도 /// </summary> private float saturation; /// <summary> /// 명도 /// </summary> private float luminosity; /// <summary> /// 색상 /// </summary> private Color color; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region 색조 - Hue /// <summary> /// 색조 /// </summary> public float Hue { get { return this.hue; } set { if(this.hue != value) { Color = Color.FromHsla(value, this.saturation, this.luminosity); } } } #endregion #region 채도 - Saturation /// <summary> /// 채도 /// </summary> public float Saturation { get { return this.saturation; } set { if(this.saturation != value) { Color = Color.FromHsla(this.hue, value, this.luminosity); } } } #endregion #region 명도 - Luminosity /// <summary> /// 명도 /// </summary> public float Luminosity { get { return this.luminosity; } set { if(this.luminosity != value) { Color = Color.FromHsla(this.hue, this.saturation, value); } } } #endregion #region 색상 - Color /// <summary> /// 색상 /// </summary> public Color Color { get { return this.color; } set { if(this.color != value) { this.color = value; this.hue = color.GetHue(); this.saturation = color.GetSaturation(); this.luminosity = color.GetLuminosity(); FirePropertyChangedEvent("Hue"); FirePropertyChangedEvent("Saturation"); FirePropertyChangedEvent("Luminosity"); FirePropertyChangedEvent("Color"); } } } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Protected #region 속성 변경시 이벤트 발생시키기 - FirePropertyChangedEvent(propertyName) /// <summary> /// 속성 변경시 이벤트 발생시키기 /// </summary> /// <param name="propertyName">속성명</param> protected virtual void FirePropertyChangedEvent(string propertyName) { PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); } #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"> <ContentPage.BindingContext> <local:HSLColorViewModel Color="Orange" /> </ContentPage.BindingContext> <StackLayout HorizontalOptions="Center" VerticalOptions="Center"> <BoxView HorizontalOptions="Center" WidthRequest="100" HeightRequest="100" Color="{Binding Color}" /> <Label Margin="0,10,0,0" HorizontalOptions="Center" Text="{Binding Hue, StringFormat='색조 = {0:F2}'}" /> <Slider WidthRequest="300" Value="{Binding Hue}" /> <Label Margin="0,10,0,0" HorizontalOptions="Center" Text="{Binding Saturation, StringFormat='채도 = {0:F2}'}" /> <Slider WidthRequest="300" Value="{Binding Saturation}" /> <Label Margin="0,10,0,0" HorizontalOptions="Center" Text="{Binding Luminosity, StringFormat='명도 = {0:F2}'}" /> <Slider WidthRequest="300" Value="{Binding Luminosity}" /> </StackLayout> </ContentPage> |
