<Window x:Class="MvvmLight1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:localBehavior="clr-namespace:MvvmLight1"
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:ignore="http://www.ignore.com"
mc:Ignorable="d ignore"
Height="400"
Width="600"
Title="MVVM Light Application"
DataContext="{Binding Main, Source={StaticResource Locator}}"> <Window.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Skins/MainSkin.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Window.Resources> <StackPanel>
<Ellipse StrokeDashArray="2,4" Stroke="Red" StrokeThickness="3" Height="100" Width="100">
<i:Interaction.Behaviors>
<localBehavior:FluidBehavior FlowRate="{Binding ElementName=FlowRate,Path=Value}"
WhetherFluid="{Binding ElementName=FluidCheckBox, Path=IsChecked}"/>
</i:Interaction.Behaviors>
</Ellipse>
<Rectangle StrokeDashArray="1,2" Stroke="Blue" StrokeThickness="3" Height="100" Width="100">
<i:Interaction.Behaviors>
<localBehavior:FluidBehavior FlowRate="{Binding ElementName=FlowRate,Path=Value}"
WhetherFluid="{Binding ElementName=FluidCheckBox, Path=IsChecked}"/>
</i:Interaction.Behaviors>
</Rectangle>
<Path x:Name="MyPath"
StrokeThickness="3"
StrokeDashArray="5,10"
Stroke="Black">
<i:Interaction.Behaviors>
<localBehavior:FluidBehavior FlowRate="{Binding ElementName=FlowRate,Path=Value}"
WhetherFluid="{Binding ElementName=FluidCheckBox, Path=IsChecked}"/>
</i:Interaction.Behaviors>
<Path.Data>
<PathGeometry Figures="M 10,100 C 10,300 300,-160 300,100" />
</Path.Data>
</Path>
<StackPanel>
<CheckBox x:Name="FluidCheckBox" Content="流动效果"/>
<Slider x:Name="FlowRate" Minimum="1" Maximum="10"/>
<TextBlock Text="{Binding ElementName=FlowRate,Path=Value}"/>
</StackPanel>
</StackPanel> </Window>
由Xaml可以看出核心就是一个FluidBehavior，效果，就不过多阐述了
最核心的就是用一个定时器对于Shape的StrokeDashOffset进行改变，其中抽象FlowRate以及WhetherFluid用于控制流动速率以及是否流动
using System;
using System.Windows;
using System.Windows.Interactivity;
using System.Windows.Shapes;
using System.Windows.Threading; namespace MvvmLight1
{
/// <summary>
/// 流动行为
/// </summary>
public class FluidBehavior : Behavior<Shape>
{
#region 依赖属性 /// <summary>
/// 流动速度
/// </summary>
public int FlowRate
{
get { return (int)GetValue(FlowRateProperty); }
set { SetValue(FlowRateProperty, value); }
} // Using a DependencyProperty as the backing store for FlowRate. This enables animation, styling, binding, etc...
public static readonly DependencyProperty FlowRateProperty =
DependencyProperty.Register("FlowRate", typeof(int), typeof(FluidBehavior), new PropertyMetadata()); /// <summary>
/// 是否流动
/// </summary>
public bool WhetherFluid
{
get { return (bool)GetValue(WhetherFluidProperty); }
set { SetValue(WhetherFluidProperty, value); }
} // Using a DependencyProperty as the backing store for WhetherFluid. This enables animation, styling, binding, etc...
public static readonly DependencyProperty WhetherFluidProperty =
DependencyProperty.Register("WhetherFluid", typeof(bool), typeof(FluidBehavior), new PropertyMetadata(true, OnWhetherFluidChanged)); private static void OnWhetherFluidChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var behavior = d as FluidBehavior;
if (Convert.ToBoolean(e.NewValue))
{
behavior._timer.Start();
}
else
{
behavior._timer.Stop();
}
} #endregion protected override void OnAttached()
{
base.OnAttached();
Fluid();
} private readonly DispatcherTimer _timer = new DispatcherTimer(); //流动
private void Fluid()
{
_timer.Tick += (sender, e) =>
{
AssociatedObject.StrokeDashOffset -= FlowRate;
};
_timer.Interval = TimeSpan.FromSeconds(1d / );
if (WhetherFluid)
{
_timer.Start();
}
}
}
}