我想用圆圈替换常规ProgressBar，在论坛中搜索镜头后我发现了我想要的内容。
CircularProgressBar.XAML
<Grid>
<Path x:Name="pathRoot" Stroke="{Binding SegmentColor, ElementName=userControl}"
StrokeThickness="{Binding StrokeThickness, ElementName=userControl}" HorizontalAlignment="Left" VerticalAlignment="Top">
<Path.Data>
<PathGeometry>
<PathGeometry.Figures>
<PathFigureCollection>
<PathFigure x:Name="pathFigure">
<PathFigure.Segments>
<PathSegmentCollection>
<ArcSegment x:Name="arcSegment" SweepDirection="Clockwise" />
</PathSegmentCollection>
</PathFigure.Segments>
</PathFigure>
</PathFigureCollection>
</PathGeometry.Figures>
</PathGeometry>
</Path.Data>
</Path>
</Grid>
CircularProgressBar.cs：
public partial class CircularProgressBar : UserControl
{
public CircularProgressBar()
{
InitializeComponent();
Angle = (Percentage * 360) / 100;
RenderArc();
}
public int Radius
{
get { return (int)GetValue(RadiusProperty); }
set { SetValue(RadiusProperty, value); }
}
public Brush SegmentColor
{
get { return (Brush)GetValue(SegmentColorProperty); }
set { SetValue(SegmentColorProperty, value); }
}
public int StrokeThickness
{
get { return (int)GetValue(StrokeThicknessProperty); }
set { SetValue(StrokeThicknessProperty, value); }
}
public double Percentage
{
get { return (double)GetValue(PercentageProperty); }
set { SetValue(PercentageProperty, value); }
}
public double Angle
{
get { return (double)GetValue(AngleProperty); }
set { SetValue(AngleProperty, value); }
}
// Using a DependencyProperty as the backing store for Percentage. This enables animation, styling, binding, etc...
public static readonly DependencyProperty PercentageProperty =
DependencyProperty.Register("Percentage", typeof(double), typeof(CircularProgressBar), new PropertyMetadata(65d, new PropertyChangedCallback(OnPercentageChanged)));
// Using a DependencyProperty as the backing store for StrokeThickness. This enables animation, styling, binding, etc...
public static readonly DependencyProperty StrokeThicknessProperty =
DependencyProperty.Register("StrokeThickness", typeof(int), typeof(CircularProgressBar), new PropertyMetadata(5, new PropertyChangedCallback(OnThicknessChanged)));
// Using a DependencyProperty as the backing store for SegmentColor. This enables animation, styling, binding, etc...
public static readonly DependencyProperty SegmentColorProperty =
DependencyProperty.Register("SegmentColor", typeof(Brush), typeof(CircularProgressBar), new PropertyMetadata(new SolidColorBrush(Colors.Red), new PropertyChangedCallback(OnColorChanged)));
// Using a DependencyProperty as the backing store for Radius. This enables animation, styling, binding, etc...
public static readonly DependencyProperty RadiusProperty =
DependencyProperty.Register("Radius", typeof(int), typeof(CircularProgressBar), new PropertyMetadata(25, new PropertyChangedCallback(OnPropertyChanged)));
// Using a DependencyProperty as the backing store for Angle. This enables animation, styling, binding, etc...
public static readonly DependencyProperty AngleProperty =
DependencyProperty.Register("Angle", typeof(double), typeof(CircularProgressBar), new PropertyMetadata(120d, new PropertyChangedCallback(OnPropertyChanged)));
private static void OnColorChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
{
CircularProgressBar circle = sender as CircularProgressBar;
circle.set_Color((SolidColorBrush)args.NewValue);
}
private static void OnThicknessChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
{
CircularProgressBar circle = sender as CircularProgressBar;
circle.set_tick((int)args.NewValue);
}
private static void OnPercentageChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
{
CircularProgressBar circle = sender as CircularProgressBar;
if (circle.Percentage > 100) circle.Percentage = 100;
circle.Angle = (circle.Percentage * 360) / 100;
}
private static void OnPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
{
CircularProgressBar circle = sender as CircularProgressBar;
circle.RenderArc();
}
public void set_tick(int n)
{
pathRoot.StrokeThickness = n;
}
public void set_Color(SolidColorBrush n)
{
pathRoot.Stroke = n;
}
public void RenderArc()
{
Point startPoint = new Point(Radius, 0);
Point endPoint = ComputeCartesianCoordinate(Angle, Radius);
endPoint.X += Radius;
endPoint.Y += Radius;
pathRoot.Width = Radius * 2 + StrokeThickness;
pathRoot.Height = Radius * 2 + StrokeThickness;
pathRoot.Margin = new Thickness(StrokeThickness, StrokeThickness, 0, 0);
bool largeArc = Angle > 180.0;
Size outerArcSize = new Size(Radius, Radius);
pathFigure.StartPoint = startPoint;
if (startPoint.X == Math.Round(endPoint.X) && startPoint.Y == Math.Round(endPoint.Y))
endPoint.X -= 0.01;
arcSegment.Point = endPoint;
arcSegment.Size = outerArcSize;
arcSegment.IsLargeArc = largeArc;
}
private Point ComputeCartesianCoordinate(double angle, double radius)
{
// convert to radians
double angleRad = (Math.PI / 180.0) * (angle - 90);
double x = radius * Math.Cos(angleRad);
double y = radius * Math.Sin(angleRad);
return new Point(x, y);
}
}
MainWindow.xaml：
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<StackPanel Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center">
<Grid HorizontalAlignment="Center" VerticalAlignment="Center">
<DesignInControl:CircularProgressBar HorizontalAlignment="Center" VerticalAlignment="Center"
SegmentColor="#FF878889" StrokeThickness="25" Percentage="100" />
<DesignInControl:CircularProgressBar HorizontalAlignment="Center" VerticalAlignment="Center"
Percentage="{Binding Value, ElementName=slider}" SegmentColor="#026873" StrokeThickness="25" />
</Grid>
<Grid HorizontalAlignment="Center" VerticalAlignment="Center"/>
<Grid HorizontalAlignment="Center" VerticalAlignment="Center"/>
<Grid HorizontalAlignment="Center" VerticalAlignment="Center"/>
</StackPanel>
<Slider x:Name="slider" Grid.Row="1" Maximum="100" Value="60" />
</Grid>
结果：
http://s21.postimg.org/xymj8k4pz/image.png
因此，在将相同的代码粘贴到我的解决方案中并运行后，我只能看到Slider Circle Bar，这是我的代码：
<StackPanel Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="530,303,114,303">
<Grid HorizontalAlignment="Center" VerticalAlignment="Center">
<DesignInControl:CircularProgressBar HorizontalAlignment="Center" VerticalAlignment="Center"
SegmentColor="#FF878889" StrokeThickness="8" Percentage="100" />
<DesignInControl:CircularProgressBar HorizontalAlignment="Center" VerticalAlignment="Center"
Percentage="{Binding Value, ElementName=slider}" SegmentColor="#026873" StrokeThickness="8" />
</Grid>
</StackPanel>
<Slider x:Name="slider" Maximum="100" Value="20" Width="200" Margin="597,185,227,495" />
我做错了吗？
答案 0 :(得分：5)
您可能错过了x:Name="userControl"定义中的UserControl：
<UserControl x:Name="userControl" x:Class="DesignInControl.CircularProgressBar"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008">
<Grid>
<Path x:Name="pathRoot" Stroke="{Binding SegmentColor, ElementName=userControl}" StrokeThickness="{Binding StrokeThickness, ElementName=userControl}" HorizontalAlignment="Left" VerticalAlignment="Top">
<Path.Data>
...
答案 1 :(得分：1)
这演示了如何为圆圈设置动画。
当AnimateProgressCircle为真时，＆＃34;忙碌＆＃34;圆圈将旋转，否则它将是不可见的。
<!-- "I'm Busy" Animation circle. -->
<StackPanel Height="20" Width="20">
<Viewbox>
<!-- All this does is display the circle. -->
<local:CircularProgressBar HorizontalAlignment="Center" VerticalAlignment="Center"
Percentage="0" SegmentColor="#726873" StrokeThickness="10">
<!-- All this does is continuously animate circle angle from 0 - 100% in response to "IfAnimateProgressCircle". -->
<local:CircularProgressBar.Style>
<Style TargetType="local:CircularProgressBar">
<Style.Triggers>
<DataTrigger Binding="{Binding IfAnimateProgressCircle}" Value="True">
<DataTrigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation
Storyboard.TargetProperty="Percentage"
From="0"
To="100"
Duration="0:0:1"
AutoReverse="True"
RepeatBehavior = "Forever"
/>
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
<DataTrigger.ExitActions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation Storyboard.TargetProperty="Percentage" To="0.0" Duration="0:0:0" />
</Storyboard>
</BeginStoryboard>
</DataTrigger.ExitActions>
</DataTrigger>
</Style.Triggers>
</Style>
</local:CircularProgressBar.Style>
</local:CircularProgressBar>
</Viewbox>
</StackPanel>
<Viewbox>中时，它总是与父容器完美匹配。经过测试：
WPF .NET 4.5 + .NET 4.6.1 Win7 x64 Visual Studio 2015 + Update 2 要进行测试，请在DataContext="{Binding RelativeSource={RelativeSource Self}}"标记中设置<Window>，然后使用此代码。
你应该看到圆圈暂停2秒，然后动画4秒，然后停止。
public partial class MainWindow : Window, INotifyPropertyChanged
{
private bool _ifAnimateProgressCircle;
public MainWindow()
{
InitializeComponent();
Task.Run(
async () =>
{
// Animates circle for 4 seconds.
IfAnimateProgressCircle = false;
await Task.Delay(TimeSpan.FromMilliseconds(2000));
IfAnimateProgressCircle = true;
await Task.Delay(TimeSpan.FromMilliseconds(6000));
IfAnimateProgressCircle = false;
});
}
public bool IfAnimateProgressCircle
{
get { return _ifAnimateProgressCircle; }
set { _ifAnimateProgressCircle = value; OnPropertyChanged(); }
}
#region INotifyPropertyChanged
public event PropertyChangedEventHandler PropertyChanged;
[NotifyPropertyChangedInvocator]
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
#endregion
}