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| using System; using System.Windows; using System.Windows.Controls; using System.Windows.Media; using System.Windows.Shapes;
namespace WPF.Controls { public class CircularProgressBar : Control { #region 依赖属性
public static readonly DependencyProperty ProgressProperty = DependencyProperty.Register( "Progress", typeof(double), typeof(CircularProgressBar), new FrameworkPropertyMetadata( 0.0, FrameworkPropertyMetadataOptions.AffectsRender, OnProgressChanged, CoerceProgressValue));
public static readonly DependencyProperty BackgroundBrushProperty = DependencyProperty.Register( "BackgroundBrush", typeof(Brush), typeof(CircularProgressBar), new PropertyMetadata(Brushes.Transparent));
public static readonly DependencyProperty TrackBrushProperty = DependencyProperty.Register( "TrackBrush", typeof(Brush), typeof(CularProgressBar), new PropertyMetadata(Brushes.LightGray));
public static readonly DependencyProperty ProgressBrushProperty = DependencyProperty.Register( "ProgressBrush", typeof(Brush), typeof(CircularProgressBar), new PropertyMetadata(Brushes.DodgerBlue));
public static readonly DependencyProperty ProgressThicknessProperty = DependencyProperty.Register( "ProgressThickness", typeof(double), typeof(CircularProgressBar), new PropertyMetadata(13.0));
public static readonly DependencyProperty TrackThicknessProperty = DependencyProperty.Register( "TrackThickness", typeof(double), typeof(CircularProgressBar), new PropertyMetadata(5.0));
#endregion
#region 属性
public double Progress { get => (double)GetValue(ProgressProperty); set => SetValue(ProgressProperty, value); }
public Brush BackgroundBrush { get => (Brush)GetValue(BackgroundBrushProperty); set => SetValue(BackgroundBrushProperty, value); }
public Brush TrackBrush { get => (Brush)GetValue(TrackBrushProperty); set => SetValue(TrackBrushProperty, value); }
public Brush ProgressBrush { get => (Brush)GetValue(ProgressBrushProperty); set => SetValue(ProgressBrushProperty, value); }
public double ProgressThickness { get => (double)GetValue(ProgressThicknessProperty); set => SetValue(ProgressThicknessProperty, value); }
public double TrackThickness { get => (double)GetValue(TrackThicknessProperty); set => SetValue(TrackThicknessProperty, value); }
#endregion
static CircularProgressBar() { DefaultStyleKeyProperty.OverrideMetadata( typeof(CircularProgressBar), new FrameworkPropertyMetadata(typeof(CircularProgressBar))); }
private static object CoerceProgressValue(DependencyObject d, object value) { double progress = (double)value; return Math.Min(100, Math.Max(0, progress)); }
private static void OnProgressChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { var progressBar = (CircularProgressBar)d; progressBar.OnProgressChanged((double)e.OldValue, (double)e.NewValue); }
protected virtual void OnProgressChanged(double oldValue, double newValue) { ProgressChanged?.Invoke(this, new ProgressChangedEventArgs(newValue)); }
public event EventHandler<ProgressChangedEventArgs> ProgressChanged; }
public class ProgressChangedEventArgs : EventArgs { public double Progress { get; }
public ProgressChangedEventArgs(double progress) { Progress = progress; } } }
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