[C#/MAUI/.NET6] Binding 클래스 : ConverterParameter 속성 사용하기
■ Binding 클래스의 ConverterParameter 속성을 사용하는 방법을 보여준다. ▶ FloatToIntegerConverter.cs
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using System.Globalization; namespace TestProject; /// <summary> /// 단정도 실수↔정수 변환자 /// </summary> public class FloatToIntegerConverter : IValueConverter { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Public #region 변환하기 - Convert(sourceValue, targetType, parameter, cultureInfo) /// <summary> /// 변환하기 /// </summary> /// <param name="sourceValue">소스 값</param> /// <param name="targetType">타겟 타입</param> /// <param name="parameter">매개 변수</param> /// <param name="cultureInfo">문화 정보</param> /// <returns>변환 값</returns> public object Convert(object sourceValue, Type targetType, object parameter, CultureInfo cultureInfo) { return (int)Math.Round((float)sourceValue * GetParameter(parameter)); } #endregion #region 역변환하기 - ConvertBack(sourceValue, targetType, parameter, cultureInfo) /// <summary> /// 역변환하기 /// </summary> /// <param name="sourceValue">소스 값</param> /// <param name="targetType">타겟 타입</param> /// <param name="parameter">매개 변수</param> /// <param name="cultureInfo">문화 정보</param> /// <returns>역변환 값</returns> public object ConvertBack(object sourceValue, Type targetType, object parameter, CultureInfo cultureInfo) { return (int)sourceValue / GetParameter(parameter); } #endregion ////////////////////////////////////////////////////////////////////////////////////////// Private #region 매개 변수 구하기 - GetParameter(parameter) /// <summary> /// 매개 변수 구하기 /// </summary> /// <param name="parameter">매개 변수</param> /// <returns>매개 변수</returns> private double GetParameter(object parameter) { if(parameter is float) { return (float)parameter; } else if(parameter is int) { return (int)parameter; } else if(parameter is string) { return float.Parse((string)parameter); } return 1; } #endregion } |
▶ NamedColor.cs
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using System.Reflection; using System.Text; namespace TestProject; /// <summary> /// 이름있는 색상 /// </summary> public class NamedColor : IEquatable<NamedColor>, IComparable<NamedColor> { //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 이름있는 색상 리스트 - NamedColorList /// <summary> /// 이름있는 색상 리스트 /// </summary> public static IList<NamedColor> NamedColorList { private set; get; } #endregion ////////////////////////////////////////////////////////////////////////////////////////// Instance //////////////////////////////////////////////////////////////////////////////// Public #region 명칭 - Name /// <summary> /// 명칭 /// </summary> public string Name { private set; get; } #endregion #region 친숙한 명칭 - FriendlyName /// <summary> /// 친숙한 명칭 /// </summary> public string FriendlyName { private set; get; } #endregion #region 색상 - Color /// <summary> /// 색상 /// </summary> public Color Color { private set; get; } #endregion #region RGB 디스플레이 - RGBDisplay /// <summary> /// RGB 디스플레이 /// </summary> public string RGBDisplay { private set; get; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Static #region 생성자 - NamedColor() /// <summary> /// 생성자 /// </summary> static NamedColor() { List<NamedColor> namedColorList = new List<NamedColor>(); StringBuilder stringBuilder = new StringBuilder(); foreach(FieldInfo fieldInfo in typeof(Colors).GetRuntimeFields()) { if(fieldInfo.IsPublic && fieldInfo.IsStatic && fieldInfo.FieldType == typeof(Color)) { string name = fieldInfo.Name; stringBuilder.Clear(); int index = 0; foreach(char character in name) { if(index != 0 && Char.IsUpper(character)) { stringBuilder.Append(' '); } stringBuilder.Append(character); index++; } Color color = (Color)fieldInfo.GetValue(null); NamedColor namedColor = new NamedColor { Name = name, FriendlyName = stringBuilder.ToString(), Color = color, RGBDisplay = string.Format ( "{0:X2}-{1:X2}-{2:X2}", (int)(255 * color.Red ), (int)(255 * color.Green), (int)(255 * color.Blue ) ) }; namedColorList.Add(namedColor); } } namedColorList.TrimExcess(); namedColorList.Sort(); NamedColorList = namedColorList; } #endregion ////////////////////////////////////////////////////////////////////////////////////////// Instance //////////////////////////////////////////////////////////////////////////////// Private #region 생성자 - NamedColor() /// <summary> /// 생성자 /// </summary> private NamedColor() { } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 찾기 - Find(name) /// <summary> /// 찾기 /// </summary> /// <param name="name">명칭</param> /// <returns>이름있는 색상</returns> public static NamedColor Find(string name) { return ((List<NamedColor>)NamedColorList).Find(nc => nc.Name == name); } #endregion #region 최근접 색상명 구하기 - GetNearestColorName(color) /// <summary> /// 최근접 색상명 구하기 /// </summary> /// <param name="color">색상</param> /// <returns>최근접 색상명</returns> public static string GetNearestColorName(Color color) { double shortestDistance = 1000; NamedColor closestColor = null; foreach(NamedColor namedColor in NamedColor.NamedColorList) { double distance = Math.Sqrt ( Math.Pow(color.Red - namedColor.Color.Red , 2) + Math.Pow(color.Green - namedColor.Color.Green, 2) + Math.Pow(color.Blue - namedColor.Color.Blue , 2) ); if(distance < shortestDistance) { shortestDistance = distance; closestColor = namedColor; } } return closestColor.Name; } #endregion ////////////////////////////////////////////////////////////////////////////////////////// Instance //////////////////////////////////////////////////////////////////////////////// Public #region 동일 여부 구하기 - Equals(other) /// <summary> /// 동일 여부 구하기 /// </summary> /// <param name="other">다른 이름있는 색상</param> /// <returns>동일 여부</returns> public bool Equals(NamedColor other) { return Name.Equals(other.Name); } #endregion #region 비교하기 - CompareTo(other) /// <summary> /// 비교하기 /// </summary> /// <param name="other">다른 이름있는 색상</param> /// <returns>비교 결과</returns> public int CompareTo(NamedColor other) { return Name.CompareTo(other.Name); } #endregion } |
▶ RGBColorViewModel.cs
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using System.ComponentModel; namespace TestProject; /// <summary> /// RGB 색상 뷰 모델 /// </summary> public class RGBColorViewModel : INotifyPropertyChanged { //////////////////////////////////////////////////////////////////////////////////////////////////// Event ////////////////////////////////////////////////////////////////////////////////////////// Public #region 속성 변경시 - PropertyChanged /// <summary> /// 속성 변경시 /// </summary> public event PropertyChangedEventHandler PropertyChanged; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 색상 /// </summary> private Color color; /// <summary> /// 명칭 /// </summary> private string name; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region 적색 - Red /// <summary> /// 적색 /// </summary> public float Red { get { return this.color.Red; } set { if(this.color.Red != value) { Color = new Color(value, this.color.Green, this.color.Blue); } } } #endregion #region 녹색 - Green /// <summary> /// 녹색 /// </summary> public float Green { get { return this.color.Green; } set { if(this.color.Green != value) { Color = new Color(this.color.Red, value, this.color.Blue); } } } #endregion #region 청색 - Blue /// <summary> /// 청색 /// </summary> public float Blue { get { return this.color.Blue; } set { if(this.color.Blue != value) { Color = new Color(this.color.Red, this.color.Green, value); } } } #endregion #region 색상 - Color /// <summary> /// 색상 /// </summary> public Color Color { get { return this.color; } set { if(this.color != value) { this.color = value; PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("Red" )); PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("Green")); PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("Blue" )); PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("Color")); Name = NamedColor.GetNearestColorName(this.color); } } } #endregion #region 명칭 - Name /// <summary> /// 명칭 /// </summary> public string Name { get { return this.name; } private set { if(this.name != value) { this.name = value; PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("Name")); } } } #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:RGBColorViewModel Color="Orange" /> </ContentPage.BindingContext> <ContentPage.Resources> <Style TargetType="Slider"> <Setter Property="VerticalOptions" Value="Center" /> </Style> <Style TargetType="Label"> <Setter Property="HorizontalTextAlignment" Value="Center" /> </Style> <local:FloatToIntegerConverter x:Key="FloatToIntegerConverterKey" /> </ContentPage.Resources> <StackLayout HorizontalOptions="Center" VerticalOptions="Center"> <BoxView Color="{Binding Color}" HeightRequest="300" WidthRequest="300" HorizontalOptions="Center" /> <StackLayout Margin="0,10,0,0"> <Label Text="{Binding Name}" /> <Slider Margin="0,30,0,0" Value="{Binding Red}" /> <Label Text="{Binding Red, Converter={StaticResource FloatToIntegerConverterKey}, ConverterParameter=255, StringFormat='적색 : {0:X2}'}" /> <Slider Margin="0,10,0,0" Value="{Binding Green}" /> <Label Text="{Binding Green, Converter={StaticResource FloatToIntegerConverterKey}, ConverterParameter=255, StringFormat='녹색 : {0:X2}'}" /> <Slider Margin="0,10,0,0" Value="{Binding Blue}" /> <Label> <Label.Text> <Binding Path="Blue" StringFormat="청색 : {0:X2}" Converter="{StaticResource FloatToIntegerConverterKey}"> <Binding.ConverterParameter> <x:Single>255</x:Single> </Binding.ConverterParameter> </Binding> </Label.Text> </Label> </StackLayout> </StackLayout> </ContentPage> |
TestProject.zip
