■ DependencyProperty 클래스의 OverrideMetadata 메소드를 사용해 표준 의존 속성 디폴트 값을 설정하는 방법을 보여준다.
▶ PieSlice.cs
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using System; using System.Windows; using System.Windows.Media; using System.Windows.Shapes; namespace TestProject { /// <summary> /// 파이 슬라이스 /// </summary> public class PieSlice : Shape { //////////////////////////////////////////////////////////////////////////////////////////////////// Dependency Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region 시작 각도 속성 - StartAngleProperty /// <summary> /// 시작 각도 속성 /// </summary> public static readonly DependencyProperty StartAngleProperty = DependencyProperty.Register ( "StartAngle", typeof(double), typeof(PieSlice), new FrameworkPropertyMetadata ( 0.0, FrameworkPropertyMetadataOptions.AffectsRender, null, new CoerceValueCallback(AnglePropertyCoerceValueCallback) ) ); #endregion #region 종료 각도 속성 - EndAngleProperty /// <summary> /// 종료 각도 속성 /// </summary> public static readonly DependencyProperty EndAngleProperty = DependencyProperty.Register ( "EndAngle", typeof(double), typeof(PieSlice), new FrameworkPropertyMetadata ( 90.0, FrameworkPropertyMetadataOptions.AffectsRender, null, new CoerceValueCallback(AnglePropertyCoerceValueCallback) ) ); #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region 시작 각도 - StartAngle /// <summary> /// 시작 각도 /// </summary> public double StartAngle { get { return (double)GetValue(StartAngleProperty); } set { SetValue(StartAngleProperty, value); } } #endregion #region 종료 각도 - EndAngle /// <summary> /// 종료 각도 /// </summary> public double EndAngle { get { return (double)GetValue(EndAngleProperty); } set { SetValue(EndAngleProperty, value); } } #endregion ////////////////////////////////////////////////////////////////////////////////////////// Protected #region 정의 지오메트리 - DefiningGeometry /// <summary> /// 정의 지오메트리 /// </summary> protected override Geometry DefiningGeometry { get { double maximumWidth = Math.Max(0.0, RenderSize.Width - StrokeThickness); double maximumHeight = Math.Max(0.0, RenderSize.Height - StrokeThickness); double xStart = maximumWidth / 2.0 * Math.Cos(StartAngle * Math.PI / 180.0); double yStart = maximumHeight / 2.0 * Math.Sin(StartAngle * Math.PI / 180.0); double xEnd = maximumWidth / 2.0 * Math.Cos(EndAngle * Math.PI / 180.0); double yEnd = maximumHeight / 2.0 * Math.Sin(EndAngle * Math.PI / 180.0); StreamGeometry geometry = new StreamGeometry(); using(StreamGeometryContext context = geometry.Open()) { context.BeginFigure ( new Point ( (RenderSize.Width / 2.0) + xStart, (RenderSize.Height / 2.0) - yStart ), true, true ); context.ArcTo ( new Point ( (RenderSize.Width / 2.0) + xEnd, (RenderSize.Height / 2.0) - yEnd ), new Size ( maximumWidth / 2.0, maximumHeight / 2.0 ), 0.0, (EndAngle - StartAngle) > 180, SweepDirection.Counterclockwise, true, false ); context.LineTo ( new Point ( (RenderSize.Width / 2.0), (RenderSize.Height / 2.0) ), true, false ); } return geometry; } } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Static #region 생성자 - PieSlice() /// <summary> /// 생성자 /// </summary> static PieSlice() { Brush brush = new SolidColorBrush(Color.FromArgb(255, 6, 176, 37)); brush.Freeze(); StrokeProperty.OverrideMetadata(typeof(PieSlice), new FrameworkPropertyMetadata(brush)); FillProperty.OverrideMetadata(typeof(PieSlice), new FrameworkPropertyMetadata(brush)); } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region 각도 속성 값 강제시 콜백 처리하기 - AnglePropertyCoerceValueCallback(d, value) /// <summary> /// 각도 속성 값 강제시 콜백 처리하기 /// </summary> /// <param name="d">의존 객체</param> /// <param name="value">값</param> /// <returns>처리 결과</returns> private static object AnglePropertyCoerceValueCallback(DependencyObject d, object value) { double angle = (double)value; angle = Math.Min(angle, 359.9); angle = Math.Max(angle, 0.0 ); return angle; } #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="DependencyProperty 클래스 : OverrideMetadata 메소드를 사용해 표준 의존 속성 디폴트 값 설정하기" FontFamily="나눔고딕코딩" FontSize="16"> <Grid> <local:PieSlice HorizontalAlignment="Center" VerticalAlignment="Center" Margin="5" Height="300" Width="300" StrokeThickness="3" StartAngle="0" EndAngle="60" /> </Grid> </Window> |
