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這篇文章主要介紹如何使用Shape做動畫，文中介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們一定要看完！
圓形的等待提示動畫十分容易做，只要讓它旋轉就可以了：
但是圓形以外的形狀就不容易做了，例如三角形，總不能讓它單純地旋轉吧：
要解決這個問題可以使用StrokeDashOffset。StrokeDashOffset用于控制虛線邊框的第一個短線相對于Shape開始點的位移，使用動畫控制這個數值可以做出邊框滾動的效果：
<Page.Resources><Storyboard x:Name="ProgressStoryboard"><DoubleAnimationUsingKeyFrames EnableDependentAnimation="True" Storyboard.TargetProperty="(Shape.StrokeDashOffset)" Storyboard.TargetName="triangle"><EasingDoubleKeyFrame KeyTime="0:1:0" Value="-500" /></DoubleAnimationUsingKeyFrames></Storyboard></Page.Resources><Grid Background="#FFCCCCCC"><Grid Height="100" HorizontalAlignment="Center"><StackPanel Orientation="Horizontal" VerticalAlignment="Center"><TextBlock Text="L" FontSize="55" Margin="0,0,5,4" /><local:Triangle x:Name="triangle" Height="40" Width="40" StrokeThickness="2" Stroke="RoyalBlue" StrokeDashArray="4.045 4.045" StrokeDashOffset="0.05" StrokeDashCap="Round" /><TextBlock Text="ading..." FontSize="55" Margin="5,0,0,4" /></StackPanel></Grid></Grid>
需要注意的是Shape的邊長要正好能被StrokeDashArray中短線和缺口的和整除，即 滿足邊長 / StrokeThickness % Sum( StrokeDashArray ) = 0，這是因為在StrokeDashOffset=0的地方會截斷短線，如下圖所示：
另外注意的是邊長的計算，如Rectangle，邊長并不是(Height + Width) * 2，而是(Height - StrokeThickness) * 2 + (Width- StrokeThickness) * 2，如下圖所示，邊長應該從邊框正中間開始計算：
有一些Shape的邊長計算還會受到Stretch影響，如上一篇中自定義的Triangle：
<StackPanel Orientation="Horizontal" HorizontalAlignment="Center"><Grid Height="50" Width="50"><local:Triangle Stretch="Fill" StrokeThickness="5" Stroke="RoyalBlue" /></Grid><Grid Height="50" Width="50" Margin="10,0,0,0"><local:Triangle Stretch="None" StrokeThickness="5" Stroke="RoyalBlue" /></Grid></StackPanel>
StrokeDashArray用于將Shape的邊框變成虛線，StrokeDashArray的值是一個double類型的有序集合，里面的數值指定虛線中每一段以StrokeThickness為單位的長度。用StrokeDashArray做進度提示的基本做法就是將進度Progress通過Converter轉換為分成兩段的StrokeDashArray，第一段為實線，表示當前進度，第二段為空白。假設一個Shape的邊長是100，當前進度為50，則將StrokeDashArray設置成{50，double.MaxValue}兩段。
做成動畫如下圖所示：
<Page.Resources><Style TargetType="TextBlock"><Setter Property="FontSize"
Value="12" /></Style><local:ProgressToStrokeDashArrayConverter x:Key="ProgressToStrokeDashArrayConverter"
TargetPath="{Binding ElementName=Triangle}" /><local:ProgressToStrokeDashArrayConverter2 x:Key="ProgressToStrokeDashArrayConverter2"
TargetPath="{Binding ElementName=Triangle}" />
<toolkit:StringFormatConverter x:Key="StringFormatConverter" /><local:ProgressWrapper x:Name="ProgressWrapper" /><Storyboard x:Name="Storyboard1"><DoubleAnimation Duration="0:0:5"
To="100"
Storyboard.TargetProperty="Progress"
Storyboard.TargetName="ProgressWrapper"
EnableDependentAnimation="True" /></Storyboard></Page.Resources><Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"><Viewbox Height="150"><StackPanel Orientation="Horizontal"><Grid><local:Triangle Height="40"
Width="40"
StrokeThickness="2"
Stroke="DarkGray" /><local:Triangle x:Name="Triangle"
Height="40"
Width="40"
StrokeThickness="2"
Stroke="RoyalBlue"
StrokeDashArray="{Binding Progress,Source={StaticResource ProgressWrapper},Converter={StaticResource ProgressToStrokeDashArrayConverter}}" /><TextBlock Text="{Binding Progress,Source={StaticResource ProgressWrapper},Converter={StaticResource StringFormatConverter},ConverterParameter='{}{0:0}'}"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Margin="0,15,0,0" /></Grid><Grid Margin="20,0,0,0"><local:Triangle Height="40"
Width="40"
StrokeThickness="2"
Stroke="DarkGray" /><local:Triangle x:Name="Triangle2"
Height="40"
Width="40"
StrokeThickness="2"
Stroke="RoyalBlue"
StrokeDashArray="{Binding Progress,Source={StaticResource ProgressWrapper},Converter={StaticResource ProgressToStrokeDashArrayConverter2}}" /><TextBlock Text="{Binding Progress,Source={StaticResource ProgressWrapper},Converter={StaticResource StringFormatConverter},ConverterParameter='{}{0:0}'}"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Margin="0,15,0,0" /></Grid></StackPanel></Viewbox></Grid>其中ProgressToStrokeDashArrayConverter和ProgressToStrokeDashArrayConverter2的代碼如下：
public class ProgressToStrokeDashArrayConverter : DependencyObject, IValueConverter
{/// <summary>/// 獲取或設置TargetPath的值/// </summary> public Path TargetPath
{
get { return (Path)GetValue(TargetPathProperty);
}
set {
SetValue(TargetPathProperty, value);
}
}/// <summary>/// 標識 TargetPath 依賴屬性。///
</summary>public static readonly DependencyProperty TargetPathProperty =
DependencyProperty.Register("TargetPath", typeof(Path), typeof(ProgressToStrokeDashArrayConverter), new PropertyMetadata(null));public virtual object Convert(object value, Type targetType, object parameter, string language)
{
if (value is double == false)return null;
var progress = (double)value;if (TargetPath == null)return null;var totalLength = GetTotalLength();
var firstSection = progress * totalLength / 100 / TargetPath.StrokeThickness;if (progress == 100)
firstSection = Math.Ceiling(firstSection);var result = new DoubleCollection {
firstSection, double.MaxValue };return result;
}public object ConvertBack(object value, Type targetType, object parameter, string language)
{throw new NotImplementedException();
}protected double GetTotalLength()
{var geometry = TargetPath.Data as PathGeometry;
if (geometry == null)
return 0;
if (geometry.Figures.Any() == false)return 0;
var figure = geometry.Figures.FirstOrDefault();
if (figure == null)
return 0;
var totalLength = 0d;
var point = figure.StartPoint;
foreach (var item in figure.Segments)
{
var segment = item as LineSegment;
if (segment == null)
return 0;
totalLength += Math.Sqrt(Math.Pow(point.X - segment.Point.X, 2) + Math.Pow(point.Y - segment.Point.Y, 2));
point = segment.Point;
}
totalLength += Math.Sqrt(Math.Pow(point.X - figure.StartPoint.X, 2) + Math.Pow(point.Y - figure.StartPoint.Y, 2));
return totalLength;
}
}
public class ProgressToStrokeDashArrayConverter2 : ProgressToStrokeDashArrayConverter
{
public override object Convert(object value, Type targetType, object parameter, string language)
{
if (value is double == false)return null;
var progress = (double)value;
if (TargetPath == null)
return null;
var totalLength = GetTotalLength();
totalLength = totalLength / TargetPath.StrokeThickness;
var thirdSection = progress * totalLength / 100;
if (progress == 100)
thirdSection = Math.Ceiling(thirdSection);
var secondSection = (totalLength - thirdSection) / 2;
var result = new DoubleCollection { 0, secondSection, thirdSection, double.MaxValue };
return result;
}
}由于代碼只是用于演示，protected double GetTotalLength()寫得比較將就。可以看到這兩個Converter繼承自DependencyObject，這是因為這里需要通過綁定為TargetPath賦值。
這里還有另一個類ProgressWrapper：
public class ProgressWrapper : DependencyObject
{/// <summary>/// 獲取或設置Progress的值/// </summary> public double Progress
{get { return (double)GetValue(ProgressProperty); }set { SetValue(ProgressProperty, value); }
}/// <summary>/// 標識 Progress 依賴屬性。///
</summary>public static readonly DependencyProperty ProgressProperty =
DependencyProperty.Register("Progress", typeof(double), typeof(ProgressWrapper), new PropertyMetadata(0d));
}因為這里沒有可供Storyboard操作的double屬性，所以用這個類充當Storyboard和StrokeDashArray的橋梁。UWPCommunityToolkit中也有一個差不多用法的類BindableValueHolder，這個類通用性比較強，可以參考它的用法。
只是做個動畫而已，又是Converter，又是Wrapper，又是Binding，看起來十分復雜，如果Shape上面有Progress屬性就方便多了。這時候首先會考慮附加屬性，在XAML用法如下：
<UserControl.Resources> <Storyboard x:Name="Storyboard1"><DoubleAnimation Duration="0:0:5" To="100" Storyboard.TargetProperty="(local:PathExtention.Progress)" Storyboard.TargetName="Triangle" /> </Storyboard></UserControl.Resources><Grid x:Name="LayoutRoot" Background="White"><local:Triangle x:Name="Triangle" Height="40" local:PathExtention.Progress="0" Width="40" StrokeThickness="2" Stroke="RoyalBlue" ></local:Triangle></Grid>
但其實這是行不通的，XAML有一個存在了很久的限制：However, an existing limitation of the Windows Runtime XAML implementation is that you cannot animate a custom attached property.。這個限制決定了XAML不能對自定義附加屬性做動畫。不過，這個限制只限制了不能對自定義附加屬性本身做動畫，但對附加屬性中的類的屬性則可以，例如以下這種寫法應該是行得通的：
<UserControl.Resources> <Storyboard x:Name="Storyboard1"><DoubleAnimation Duration="0:0:5" To="100" Storyboard.TargetProperty="(local:PathExtention.Progress)" Storyboard.TargetName="TrianglePathExtention" /> </Storyboard></UserControl.Resources><Grid x:Name="LayoutRoot" Background="White"><local:Triangle x:Name="Triangle" Height="40" Width="40" StrokeThickness="2" Stroke="RoyalBlue" > <local:PathHelper><local:PathExtention x:Name="TrianglePathExtention" Progress="0" /> </local:PathHelper></local:Triangle></Grid>
更優雅的寫法是利用XamlBehaviors，這篇文章很好地解釋了XamlBehaviors的作用：
XAML Behaviors非常重要，因為它們提供了一種方法，讓開發人員能夠以一種簡潔、可重復的方式輕松地向UI對象添加功能。 他們無需創建控件的子類或重復編寫邏輯代碼，只要簡單地增加一個XAML代碼片段。
要使用Behavior改進現有代碼，只需實現一個PathProgressBehavior：
public class PathProgressBehavior : Behavior<UIElement>
{protected override void OnAttached()
{base.OnAttached();UpdateStrokeDashArray();
}/// <summary>/// 獲取或設置Progress的值/// </summary> public double Progress
{get { return (double)GetValue(ProgressProperty); }set { SetValue(ProgressProperty, value); }
}/*Progress DependencyProperty*/protected virtual void OnProgressChanged(double oldValue, double newValue)
{UpdateStrokeDashArray();
}protected virtual double GetTotalLength(Path path)
{/*some code*/}private void UpdateStrokeDashArray()
{
var target = AssociatedObject as Path;if (target == null)return;double progress = Progress;
//if (target.ActualHeight == 0 || target.ActualWidth == 0)//
return;
if (target.StrokeThickness == 0)
return;
var totalLength = GetTotalLength(target);
var firstSection = progress * totalLength / 100 / target.StrokeThickness;
if (progress == 100)
firstSection = Math.Ceiling(firstSection);
var result = new DoubleCollection {
firstSection, double.MaxValue
};
target.StrokeDashArray = result;
}
}XAML中如下使用：
<UserControl.Resources> <Storyboard x:Name="Storyboard1"><DoubleAnimation Duration="0:0:5" To="100" Storyboard.TargetProperty="Progress" Storyboard.TargetName="PathProgressBehavior" EnableDependentAnimation="True"/> </Storyboard></UserControl.Resources><Grid x:Name="LayoutRoot" Background="White"> <local:Triangle x:Name="Triangle" Height="40" local:PathExtention.Progress="0" Width="40" StrokeThickness="2" Stroke="RoyalBlue" ><interactivity:Interaction.Behaviors> <local:PathProgressBehavior x:Name="PathProgressBehavior" /></interactivity:Interaction.Behaviors> </local:Triangle></Grid>
這樣看起來就清爽多了。
先看看效果：
其實這篇文章里并不會討論填充動畫，不過首先聲明做填充動畫會更方便快捷，這一段只是深入學習過程中的產物，實用價值不高。
上圖三角形的填充的效果只需要疊加兩個同樣大小的Shape，前面那個設置Stretch="Uniform"，再通過DoubleAnimation改變它的高度就可以了。文字也是相同的原理，疊加兩個相同的TextBlock，將前面那個放在一個無邊框的ScrollViewer里再去改變ScrollViewer的高度。
<Page.Resources><Style TargetType="TextBlock"><Setter Property="FontSize"
Value="12" /></Style><local:ProgressToHeightConverter x:Key="ProgressToHeightConverter"
TargetContentControl="{Binding ElementName=ContentControl}" /><local:ReverseProgressToHeightConverter x:Key="ReverseProgressToHeightConverter"
TargetContentControl="{Binding ElementName=ContentControl2}" /><toolkit:StringFormatConverter x:Key="StringFormatConverter" /><local:ProgressWrapper x:Name="ProgressWrapper" /><Storyboard x:Name="Storyboard1"><DoubleAnimation Duration="0:0:5"
To="100"
Storyboard.TargetProperty="Progress"
Storyboard.TargetName="ProgressWrapper"
EnableDependentAnimation="True" /></Storyboard></Page.Resources><Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"><Grid><local:Triangle Height="40"
Width="40"
StrokeThickness="2"
Fill="LightGray" /><local:Triangle Height="40"
Width="40"
Stretch="Fill"
StrokeThickness="2"
Stroke="RoyalBlue" /><ContentControl x:Name="ContentControl"
VerticalAlignment="Bottom"
HorizontalAlignment="Center"
Height="{Binding Progress,Source={StaticResource ProgressWrapper},Converter={StaticResource ProgressToHeightConverter}}"><local:Triangle x:Name="Triangle3" Height="40"
Width="40"
StrokeThickness="2"
Fill="RoyalBlue"
Stretch="Uniform"
VerticalAlignment="Bottom" /></ContentControl><TextBlock Text="{Binding Progress,Source={StaticResource ProgressWrapper},Converter={StaticResource StringFormatConverter},ConverterParameter='{}{0:0}'}"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Margin="0,12,0,0"
Foreground="White" /><ContentControl x:Name="ContentControl2"
Height="{Binding Progress,Source={StaticResource ProgressWrapper},Converter={StaticResource ReverseProgressToHeightConverter}}"
VerticalAlignment="Top"
HorizontalAlignment="Center"><ScrollViewer BorderThickness="0"
Padding="0,0,0,0"
VerticalScrollBarVisibility="Disabled"
HorizontalScrollBarVisibility="Disabled"
VerticalAlignment="Top"
Height="40"><Grid Height="40"><TextBlock Text="{Binding Progress,Source={StaticResource ProgressWrapper},Converter={StaticResource StringFormatConverter},ConverterParameter='{}{0:0}'}"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Margin="0,12,0,0" /></Grid></ScrollViewer></ContentControl></Grid></Grid>ProgressToHeightConverter和ReverseProgressToHeightConverter的代碼如下：
public class ProgressToHeightConverter : DependencyObject, IValueConverter
{/// <summary>/// 獲取或設置TargetContentControl的值/// </summary> public ContentControl TargetContentControl
{
get {
return (ContentControl)GetValue(TargetContentControlProperty);
}
set {
SetValue(TargetContentControlProperty, value);
}
}/// <summary>/// 標識 TargetContentControl 依賴屬性。///
</summary>public static readonly DependencyProperty TargetContentControlProperty =
DependencyProperty.Register("TargetContentControl", typeof(ContentControl), typeof(ProgressToHeightConverter), new PropertyMetadata(null));
public object Convert(object value, Type targetType, object parameter, string language)
{
if (value is double == false)
return 0d;
var progress = (double)value;
if (TargetContentControl == null)
return 0d;
var element = TargetContentControl.Content as FrameworkElement;
if (element == null)
return 0d;return element.Height * progress / 100;
}public object ConvertBack(object value, Type targetType, object parameter, string language)
{throw new NotImplementedException();
}
}public class ReverseProgressToHeightConverter : DependencyObject, IValueConverter
{/// <summary>/// 獲取或設置TargetContentControl的值/// </summary>
public ContentControl TargetContentControl
{
get {
return (ContentControl)GetValue(TargetContentControlProperty);
}
set {
SetValue(TargetContentControlProperty, value);
}
}/// <summary>/// 標識 TargetContentControl 依賴屬性。///
</summary>public static readonly DependencyProperty TargetContentControlProperty =
DependencyProperty.Register("TargetContentControl", typeof(ContentControl), typeof(ReverseProgressToHeightConverter), new PropertyMetadata(null));
public object Convert(object value, Type targetType, object parameter, string language)
{
if (value is double == false)
return double.NaN;
var progress = (double)value;if (TargetContentControl == null)return double.NaN;
var element = TargetContentControl.Content as FrameworkElement;
if (element == null)return double.NaN;
return element.Height * (100 - progress) / 100;
}
public object ConvertBack(object value, Type targetType, object parameter, string language)
{
throw new NotImplementedException();
}
}再提醒一次，實際上老老實實做填充動畫好像更方便些。
同樣的技術，配合ControlTemplate可以制作很有趣的按鈕：
PointerEntered時，按鈕的邊框從進入點向反方向延伸。PointerExited時，邊框從反方向向移出點消退。要做到這點需要在PointerEntered時改變邊框的方向，使用了ChangeAngleToEnterPointerBehavior：
public class ChangeAngleToEnterPointerBehavior : Behavior<Ellipse>
{protected override void OnAttached()
{base.OnAttached();
AssociatedObject.PointerEntered += OnAssociatedObjectPointerEntered;
AssociatedObject.PointerExited += OnAssociatedObjectPointerExited;
}protected override void OnDetaching()
{base.OnDetaching();
AssociatedObject.PointerEntered -= OnAssociatedObjectPointerEntered;
AssociatedObject.PointerExited -= OnAssociatedObjectPointerExited;
}private void OnAssociatedObjectPointerExited(object sender, PointerRoutedEventArgs e)
{UpdateAngle(e);
}private void OnAssociatedObjectPointerEntered(object sender, PointerRoutedEventArgs e)
{UpdateAngle(e);
}private void UpdateAngle(PointerRoutedEventArgs e)
{if (AssociatedObject == null || AssociatedObject.StrokeThickness == 0)return;
AssociatedObject.RenderTransformOrigin = new Point(0.5, 0.5);var rotateTransform = AssociatedObject.RenderTransform as RotateTransform;if (rotateTransform == null)
{
rotateTransform = new RotateTransform();
AssociatedObject.RenderTransform = rotateTransform;
}var point = e.GetCurrentPoint(AssociatedObject.Parent as UIElement).Position;var centerPoint = new Point(AssociatedObject.ActualWidth / 2, AssociatedObject.ActualHeight / 2);var angleOfLine = Math.Atan2(point.Y - centerPoint.Y, point.X - centerPoint.X) * 180 / Math.PI;
rotateTransform.Angle = angleOfLine + 180;
}
}這個類命名不是很好，不過將就一下吧。
為了做出邊框延伸的效果，另外需要一個類EllipseProgressBehavior：
public class EllipseProgressBehavior : Behavior<Ellipse>
{/// <summary>/// 獲取或設置Progress的值/// </summary>
public double Progress
{
get {
return (double)GetValue(ProgressProperty);
}
set {
SetValue(ProgressProperty, value);
}
}/// <summary>/// 標識 Progress 依賴屬性。/// </summary>
public static readonly DependencyProperty ProgressProperty =
DependencyProperty.Register("Progress", typeof(double), typeof(EllipseProgressBehavior), new PropertyMetadata(0d, OnProgressChanged));
private static void OnProgressChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
{
var target = obj as EllipseProgressBehavior;
double oldValue = (double)args.OldValue;
double newValue = (double)args.NewValue;if (oldValue != newValue)
target.OnProgressChanged(oldValue, newValue);
}
protected virtual void OnProgressChanged(double oldValue, double newValue)
{UpdateStrokeDashArray();
}protected virtual double GetTotalLength()
{if (AssociatedObject == null)return 0;
return (AssociatedObject.ActualHeight - AssociatedObject.StrokeThickness) * Math.PI;
}private void UpdateStrokeDashArray()
{if (AssociatedObject == null || AssociatedObject.StrokeThickness == 0)
return;
//if (target.ActualHeight == 0 || target.ActualWidth == 0)//
return;var totalLength = GetTotalLength();
totalLength = totalLength / AssociatedObject.StrokeThickness;
var thirdSection = Progress * totalLength / 100;
var secondSection = (totalLength - thirdSection) / 2;
var result = new DoubleCollection { 0, secondSection, thirdSection, double.MaxValue };
AssociatedObject.StrokeDashArray = result;
}
}套用到ControlTemplate如下：
<ControlTemplate TargetType="Button"><Grid x:Name="RootGrid"><VisualStateManager.VisualStateGroups><VisualStateGroup x:Name="CommonStates"><VisualStateGroup.Transitions><VisualTransition GeneratedDuration="0:0:1"
To="Normal"><Storyboard><DoubleAnimationUsingKeyFrames EnableDependentAnimation="True"
Storyboard.TargetProperty="(local:EllipseProgressBehavior.Progress)"
Storyboard.TargetName="EllipseProgressBehavior"><EasingDoubleKeyFrame KeyTime="0:0:1"
Value="0"><EasingDoubleKeyFrame.EasingFunction><QuinticEase EasingMode="EaseOut" /></EasingDoubleKeyFrame.EasingFunction></EasingDoubleKeyFrame></DoubleAnimationUsingKeyFrames></Storyboard></VisualTransition><VisualTransition GeneratedDuration="0:0:1"
To="PointerOver"><Storyboard><DoubleAnimationUsingKeyFrames EnableDependentAnimation="True"
Storyboard.TargetProperty="(local:EllipseProgressBehavior.Progress)"
Storyboard.TargetName="EllipseProgressBehavior"><EasingDoubleKeyFrame KeyTime="0:0:1"
Value="100"><EasingDoubleKeyFrame.EasingFunction><QuinticEase EasingMode="EaseOut" /></EasingDoubleKeyFrame.EasingFunction></EasingDoubleKeyFrame></DoubleAnimationUsingKeyFrames></Storyboard></VisualTransition></VisualStateGroup.Transitions><VisualState x:Name="Normal"><Storyboard><PointerUpThemeAnimation Storyboard.TargetName="RootGrid" /></Storyboard></VisualState><VisualState x:Name="PointerOver"><Storyboard><PointerUpThemeAnimation Storyboard.TargetName="RootGrid" /></Storyboard><VisualState.Setters><Setter Target="EllipseProgressBehavior.(local:EllipseProgressBehavior.Progress)"
Value="100" /></VisualState.Setters></VisualState><VisualState x:Name="Pressed"><Storyboard><PointerDownThemeAnimation Storyboard.TargetName="RootGrid" /></Storyboard></VisualState><VisualState x:Name="Disabled" /></VisualStateGroup></VisualStateManager.VisualStateGroups><ContentPresenter x:Name="ContentPresenter"
AutomationProperties.AccessibilityView="Raw"
ContentTemplate="{TemplateBinding ContentTemplate}"
ContentTransitions="{TemplateBinding ContentTransitions}"
Content="{TemplateBinding Content}"
HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
Padding="{TemplateBinding Padding}"
VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" /><Ellipse Fill="Transparent" Stroke="{TemplateBinding BorderBrush}" StrokeThickness="2"><interactivity:Interaction.Behaviors><local:ChangeAngleToEnterPointerBehavior /><local:EllipseProgressBehavior x:Name="EllipseProgressBehavior" /></interactivity:Interaction.Behaviors></Ellipse></Grid></ControlTemplate>注意：我沒有鼓勵任何人自定義按鈕外觀的意思，能用系統自帶的動畫或樣式就盡量用系統自帶的，沒有設計師的情況下 又想UI做得與眾不同通常會做得很難看。想要UI好看，合理的布局、合理的顏色、合理的圖片就足夠了。
在學習Shape的過程中覺得好玩就做了很多嘗試，因為以前工作中做過不少等待、進度的動畫，所以這次就試著做出本文的動畫。
XAML的傳統動畫并沒有提供太多功能，主要是ColorAnimation、DoubleAnimation、PointAnimation三種，不過靠Binding和Converter可以彌補這方面的不足，實現很多需要的功能。
本文的一些動畫效果參考了SVG的動畫。話說回來，Windows 10 1703新增了SvgImageSource，不過看起來只是簡單地將SVG翻譯成對應的Shape，然后用Shape呈現，不少高級特性都不支持（如下圖陰影的濾鏡），用法如下：
<Image><Image.Source><SvgImageSource UriSource="feoffset_1.svg" /></Image.Source></Image>
SvgImageSource：
原本的Svg：
以上是“如何使用Shape做動畫”這篇文章的所有內容，感謝各位的閱讀！希望分享的內容對大家有幫助，更多相關知識，歡迎關注億速云行業資訊頻道！
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