超炫酷的WPF实现Loading控件效果

2020-01-24 01:22:11

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Win8系统的Loading效果还是很不错的，网上也有人用CSS3等技术实现，研究了一下，并打算用WPF自定义一个Loading控件实现类似的效果，并可以让用户对Loading的颗粒（Particle）背景颜色进行自定义，话不多说，直接上代码：

1、用VS2012新建一个WPF的用户控件库项目WpfControlLibraryDemo，VS自动生成如下结构：

2、删除UserControl1.xaml，并新建一个Loading的CustomControl(不是UserControl),如下图所示：

3、如果报错找不到Loading类型，请编译，下面在Generic.xaml主题文件中对Loading的样式和内容进行定义（注意添加

xmlns:system = "clr-namespace:System;assembly=mscorlib"），代码如下：<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:system = "clr-namespace:System;assembly=mscorlib" xmlns:local="clr-namespace:WpfControlLibraryDemo"> <Style TargetType="{x:Type local:Loading}"> <Setter Property="Template">  <Setter.Value>  <ControlTemplate TargetType="{x:Type local:Loading}">   <Border Background="{TemplateBinding Background}"    BorderBrush="{TemplateBinding BorderBrush}"    BorderThickness="{TemplateBinding BorderThickness}">   <Grid Width = "50" Height = "50">    <Grid.Resources>    <!-- Value Converters -->        <!-- Particle Styling ,must to has RelativeSource -->    <SolidColorBrush x:Key = "ParticleColor" Color = "{Binding Path=FillColor,RelativeSource={RelativeSource TemplatedParent}}" />    <SolidColorBrush x:Key = "ParticleBackgroundColor" Color = "Transparent"/>    <system:Double x:Key = "ParticleOpacity">1</system:Double>    <system:Double x:Key = "ParticleRadius">5</system:Double>    <system:Double x:Key = "StartingPointX">0</system:Double>    <system:Double x:Key = "StartingPointY">-20</system:Double>    <system:Double x:Key = "RotationPointX">0.5</system:Double>    <system:Double x:Key = "RotationPointY">0.5</system:Double>    <!-- StoryBoard -->    <system:TimeSpan x:Key = "StoryBoardBeginTimeP0">00:00:00.000</system:TimeSpan>    <system:TimeSpan x:Key = "StoryBoardBeginTimeP1">00:00:00.100</system:TimeSpan>    <system:TimeSpan x:Key = "StoryBoardBeginTimeP2">00:00:00.200</system:TimeSpan>    <system:TimeSpan x:Key = "StoryBoardBeginTimeP3">00:00:00.300</system:TimeSpan>    <system:TimeSpan x:Key = "StoryBoardBeginTimeP4">00:00:00.400</system:TimeSpan>    <Duration x:Key = "StoryBoardDuration">00:00:01.800</Duration>    <!-- Particle Origin Angles -->    <system:Double x:Key = "ParticleOriginAngleP0">0</system:Double>    <system:Double x:Key = "ParticleOriginAngleP1">-10</system:Double>    <system:Double x:Key = "ParticleOriginAngleP2">-20</system:Double>    <system:Double x:Key = "ParticleOriginAngleP3">-30</system:Double>    <system:Double x:Key = "ParticleOriginAngleP4">-40</system:Double>    <!-- Particle Position & Timing 1 -->    <system:Double x:Key = "ParticleBeginAngle1">0</system:Double>    <system:Double x:Key = "ParticleEndAngle1">90</system:Double>    <system:TimeSpan x:Key = "ParticleBeginTime1">00:00:00.000</system:TimeSpan>    <Duration x:Key = "ParticleDuration1">00:00:00.750</Duration>    <!-- Particle Position & Timing 2 -->    <system:Double x:Key = "ParticleBeginAngle2">90</system:Double>    <system:Double x:Key = "ParticleEndAngle2">270</system:Double>    <system:TimeSpan x:Key = "ParticleBeginTime2">00:00:00.751</system:TimeSpan>    <Duration x:Key = "ParticleDuration2">00:00:00.300</Duration>    <!-- Particle Position & Timing 3 -->    <system:Double x:Key = "ParticleBeginAngle3">270</system:Double>    <system:Double x:Key = "ParticleEndAngle3">360</system:Double>    <system:TimeSpan x:Key = "ParticleBeginTime3">00:00:01.052</system:TimeSpan>    <Duration x:Key = "ParticleDuration3">00:00:00.750</Duration>    <Style x:Key = "EllipseStyle" TargetType = "Ellipse">     <Setter Property = "Width" Value = "{StaticResource ParticleRadius}"/>     <Setter Property = "Height" Value = "{StaticResource ParticleRadius}"/>     <Setter Property = "Fill" Value = "{StaticResource ParticleColor}"/>     <Setter Property = "RenderTransformOrigin" Value = "0.5, 0.5"/>     <Setter Property = "Opacity" Value = "{StaticResource ParticleOpacity}"/>    </Style>    </Grid.Resources>    <Canvas Width = "1" Height = "1" Margin="0,0,0,0">    <Canvas.Triggers>     <EventTrigger RoutedEvent = "Canvas.Loaded">     <EventTrigger.Actions>      <BeginStoryboard>      <Storyboard        BeginTime = "{StaticResource StoryBoardBeginTimeP0}"    Duration = "{StaticResource StoryBoardDuration}"    RepeatBehavior = "Forever">       <DoubleAnimation    Storyboard.TargetName = "p0"    Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)"    From = "{StaticResource ParticleBeginAngle1}"    To = "{StaticResource ParticleEndAngle1}"    BeginTime = "{StaticResource ParticleBeginTime1}"    Duration = "{StaticResource ParticleDuration1}"/>       <DoubleAnimation    Storyboard.TargetName = "p0"    Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)"    From = "{StaticResource ParticleBeginAngle2}"    To = "{StaticResource ParticleEndAngle2}"    BeginTime = "{StaticResource ParticleBeginTime2}"    Duration = "{StaticResource ParticleDuration2}"/>       <DoubleAnimation    Storyboard.TargetName = "p0"    Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)"    From = "{StaticResource ParticleBeginAngle3}"    To = "{StaticResource ParticleEndAngle3}"    BeginTime = "{StaticResource ParticleBeginTime3}"    Duration = "{StaticResource ParticleDuration3}"/>      </Storyboard>      </BeginStoryboard>      <BeginStoryboard>      <Storyboard        BeginTime = "{StaticResource StoryBoardBeginTimeP1}"    Duration = "{StaticResource StoryBoardDuration}"    RepeatBehavior = "Forever">       <DoubleAnimation    Storyboard.TargetName = "p1"    Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)"    From = "{StaticResource ParticleBeginAngle1}"    To = "{StaticResource ParticleEndAngle1}"    BeginTime = "{StaticResource ParticleBeginTime1}"    Duration = "{StaticResource ParticleDuration1}"/>       <DoubleAnimation    Storyboard.TargetName = "p1"    Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)"    From = "{StaticResource ParticleBeginAngle2}"    To = "{StaticResource ParticleEndAngle2}"    BeginTime = "{StaticResource ParticleBeginTime2}"    Duration = "{StaticResource ParticleDuration2}"/>       <DoubleAnimation    Storyboard.TargetName = "p1"    Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)"    From = "{StaticResource ParticleBeginAngle3}"    To = "{StaticResource ParticleEndAngle3}"    BeginTime = "{StaticResource ParticleBeginTime3}"    Duration = "{StaticResource ParticleDuration3}"/>      </Storyboard>      </BeginStoryboard>      <BeginStoryboard>      <Storyboard        BeginTime = "{StaticResource StoryBoardBeginTimeP2}"    Duration = "{StaticResource StoryBoardDuration}"    RepeatBehavior = "Forever">       <DoubleAnimation    Storyboard.TargetName = "p2"    Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)"    From = "{StaticResource ParticleBeginAngle1}"    To = "{StaticResource ParticleEndAngle1}"    BeginTime = "{StaticResource ParticleBeginTime1}"    Duration = "{StaticResource ParticleDuration1}"/>       <DoubleAnimation    Storyboard.TargetName = "p2"    Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)"    From = "{StaticResource ParticleBeginAngle2}"    To = "{StaticResource ParticleEndAngle2}"    BeginTime = "{StaticResource ParticleBeginTime2}"    Duration = "{StaticResource ParticleDuration2}"/>       <DoubleAnimation    Storyboard.TargetName = "p2"    Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)"    From = "{StaticResource ParticleBeginAngle3}"    To = "{StaticResource ParticleEndAngle3}"    BeginTime = "{StaticResource ParticleBeginTime3}"    Duration = "{StaticResource ParticleDuration3}"/>      </Storyboard>      </BeginStoryboard>      <BeginStoryboard>      <Storyboard        BeginTime = "{StaticResource StoryBoardBeginTimeP3}"    Duration = "{StaticResource StoryBoardDuration}"    RepeatBehavior = "Forever">       <DoubleAnimation    Storyboard.TargetName = "p3"    Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)"    From = "{StaticResource ParticleBeginAngle1}"    To = "{StaticResource ParticleEndAngle1}"    BeginTime = "{StaticResource ParticleBeginTime1}"    Duration = "{StaticResource ParticleDuration1}"/>       <DoubleAnimation    Storyboard.TargetName = "p3"    Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)"    From = "{StaticResource ParticleBeginAngle2}"    To = "{StaticResource ParticleEndAngle2}"    BeginTime = "{StaticResource ParticleBeginTime2}"    Duration = "{StaticResource ParticleDuration2}"/>       <DoubleAnimation    Storyboard.TargetName = "p3"    Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)"    From = "{StaticResource ParticleBeginAngle3}"    To = "{StaticResource ParticleEndAngle3}"    BeginTime = "{StaticResource ParticleBeginTime3}"    Duration = "{StaticResource ParticleDuration3}"/>      </Storyboard>      </BeginStoryboard>      <BeginStoryboard>      <Storyboard        BeginTime = "{StaticResource StoryBoardBeginTimeP4}"    Duration = "{StaticResource StoryBoardDuration}"    RepeatBehavior = "Forever">       <DoubleAnimation    Storyboard.TargetName = "p4"    Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)"    From = "{StaticResource ParticleBeginAngle1}"    To = "{StaticResource ParticleEndAngle1}"    BeginTime = "{StaticResource ParticleBeginTime1}"    Duration = "{StaticResource ParticleDuration1}"/>       <DoubleAnimation    Storyboard.TargetName = "p4"    Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)"    From = "{StaticResource ParticleBeginAngle2}"    To = "{StaticResource ParticleEndAngle2}"    BeginTime = "{StaticResource ParticleBeginTime2}"    Duration = "{StaticResource ParticleDuration2}"/>       <DoubleAnimation    Storyboard.TargetName = "p4"    Storyboard.TargetProperty = "(UIElement.RenderTransform).(RotateTransform.Angle)"    From = "{StaticResource ParticleBeginAngle3}"    To = "{StaticResource ParticleEndAngle3}"    BeginTime = "{StaticResource ParticleBeginTime3}"    Duration = "{StaticResource ParticleDuration3}"/>      </Storyboard>      </BeginStoryboard>     </EventTrigger.Actions>     </EventTrigger>    </Canvas.Triggers>    <Border  x:Name = "p0"  Background = "{StaticResource ParticleBackgroundColor}"  Opacity = "{StaticResource ParticleOpacity}">     <Border.RenderTransform>     <RotateTransform/>     </Border.RenderTransform>     <Border.RenderTransformOrigin>     <Point X = "{StaticResource RotationPointX}" Y = "{StaticResource RotationPointY}"/>     </Border.RenderTransformOrigin>     <Ellipse Style = "{StaticResource EllipseStyle}">     <Ellipse.RenderTransform>      <TransformGroup>      <TranslateTransform X = "{StaticResource StartingPointX}" Y = "{StaticResource StartingPointY}"/>      <RotateTransform Angle = "{StaticResource ParticleOriginAngleP0}"/>      </TransformGroup>     </Ellipse.RenderTransform>     </Ellipse>    </Border>    <Border  x:Name = "p1"  Background = "{StaticResource ParticleBackgroundColor}"  Opacity = "{StaticResource ParticleOpacity}">     <Border.RenderTransform>     <RotateTransform/>     </Border.RenderTransform>     <Border.RenderTransformOrigin>     <Point X = "{StaticResource RotationPointX}" Y = "{StaticResource RotationPointY}"/>     </Border.RenderTransformOrigin>     <Ellipse Style = "{StaticResource EllipseStyle}">     <Ellipse.RenderTransform>      <TransformGroup>      <TranslateTransform X = "{StaticResource StartingPointX}" Y = "{StaticResource StartingPointY}"/>      <RotateTransform Angle = "{StaticResource ParticleOriginAngleP1}"/>      </TransformGroup>     </Ellipse.RenderTransform>     </Ellipse>    </Border>    <Border  x:Name = "p2"  Background = "{StaticResource ParticleBackgroundColor}"  Opacity = "{StaticResource ParticleOpacity}">     <Border.RenderTransform>     <RotateTransform/>     </Border.RenderTransform>     <Border.RenderTransformOrigin>     <Point X = "{StaticResource RotationPointX}" Y = "{StaticResource RotationPointY}"/>     </Border.RenderTransformOrigin>     <Ellipse Style = "{StaticResource EllipseStyle}">     <Ellipse.RenderTransform>      <TransformGroup>      <TranslateTransform X = "{StaticResource StartingPointX}" Y = "{StaticResource StartingPointY}"/>      <RotateTransform Angle = "{StaticResource ParticleOriginAngleP2}"/>      </TransformGroup>     </Ellipse.RenderTransform>     </Ellipse>    </Border>    <Border  x:Name = "p3"  Background = "{StaticResource ParticleBackgroundColor}"  Opacity = "{StaticResource ParticleOpacity}">     <Border.RenderTransform>     <RotateTransform/>     </Border.RenderTransform>     <Border.RenderTransformOrigin>     <Point X = "{StaticResource RotationPointX}" Y = "{StaticResource RotationPointY}"/>     </Border.RenderTransformOrigin>     <Ellipse Style = "{StaticResource EllipseStyle}">     <Ellipse.RenderTransform>      <TransformGroup>      <TranslateTransform X = "{StaticResource StartingPointX}" Y = "{StaticResource StartingPointY}"/>      <RotateTransform Angle = "{StaticResource ParticleOriginAngleP3}"/>      </TransformGroup>     </Ellipse.RenderTransform>     </Ellipse>    </Border>    <Border  x:Name = "p4"  Background = "{StaticResource ParticleBackgroundColor}"  Opacity = "{StaticResource ParticleOpacity}">     <Border.RenderTransform>     <RotateTransform/>     </Border.RenderTransform>     <Border.RenderTransformOrigin>     <Point X = "{StaticResource RotationPointX}" Y = "{StaticResource RotationPointY}"/>     </Border.RenderTransformOrigin>     <Ellipse Style = "{StaticResource EllipseStyle}">     <Ellipse.RenderTransform>      <TransformGroup>      <TranslateTransform X = "{StaticResource StartingPointX}" Y = "{StaticResource StartingPointY}"/>      <RotateTransform Angle = "{StaticResource ParticleOriginAngleP4}"/>      </TransformGroup>     </Ellipse.RenderTransform>     </Ellipse>    </Border>    </Canvas>   </Grid>   </Border>  </ControlTemplate>  </Setter.Value> </Setter> </Style>   </ResourceDictionary>

在构建中发现，一开始在设定绑定时，写成<SolidColorBrush x:Key = "ParticleColor" Color = "{Binding Path=FillColor}" />一直都无法绑定成功，后来查了资料，改成<SolidColorBrush x:Key = "ParticleColor" Color = "{Binding Path=FillColor,RelativeSource={RelativeSource TemplatedParent}}" /> 后成功。

4、编辑Loading.cs文件，对自定义属性FillColor和逻辑进行编码：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows;using System.Windows.Controls;using System.Windows.Data;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Imaging;using System.Windows.Navigation;using System.Windows.Shapes;namespace WpfControlLibraryDemo{ using System.ComponentModel; /// <summary> /// 按照步骤 1a 或 1b 操作，然后执行步骤 2 以在 XAML 文件中使用此自定义控件。 /// /// 步骤 1a) 在当前项目中存在的 XAML 文件中使用该自定义控件。 /// 将此 XmlNamespace 特性添加到要使用该特性的标记文件的根  /// 元素中: /// /// xmlns:MyNamespace="clr-namespace:WpfControlLibraryDemo" /// /// /// 步骤 1b) 在其他项目中存在的 XAML 文件中使用该自定义控件。 /// 将此 XmlNamespace 特性添加到要使用该特性的标记文件的根  /// 元素中: /// /// xmlns:MyNamespace="clr-namespace:WpfControlLibraryDemo;assembly=WpfControlLibraryDemo" /// /// 您还需要添加一个从 XAML 文件所在的项目到此项目的项目引用， /// 并重新生成以避免编译错误: /// /// 在解决方案资源管理器中右击目标项目，然后依次单击 /// “添加引用”->“项目”->[浏览查找并选择此项目] /// /// /// 步骤 2) /// 继续操作并在 XAML 文件中使用控件。 /// /// <MyNamespace:Loading/> /// /// </summary> public class Loading : Control { static Loading() {  //重载默认样式  DefaultStyleKeyProperty.OverrideMetadata(typeof(Loading), new FrameworkPropertyMetadata(typeof(Loading)));  //DependencyProperty 注册 FillColor  FillColorProperty = DependencyProperty.Register("FillColor",  typeof(Color),  typeof(Loading),  new UIPropertyMetadata(Colors.DarkBlue,  new PropertyChangedCallback(OnUriChanged))  );  //Colors.DarkBlue为控件初始化默认值 } //属性变更回调函数 private static void OnUriChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) {  //Border b = (Border)d;  //MessageBox.Show(e.NewValue.ToString()); } #region 自定义Fields // DependencyProperty属性定义 FillColorProperty=FillColor+Property组成 public static readonly DependencyProperty FillColorProperty; #endregion //VS设计器属性支持 [Description("背景色"), Category("个性配置"), DefaultValue("#FF668899")] public Color FillColor {  //GetValue,SetValue为固定写法，此处一般不建议处理其他逻辑  get { return (Color)GetValue(FillColorProperty); }  set { SetValue(FillColorProperty, value); } } }}

5、编译，如果无误后，可以添加WPF应用程序WpfAppLoadingTest进行测试（添加项目引用）。