WPF：Metro样式ProgressBar(圆点横向移动)，自适应宽度

先看效果图：

最直观的，这是4个圆点在移动，就用一个横向的StackPanel表示这四个点吧。

<StackPanel Orientation="Horizontal">

        <StackPanel.Resources>

            <Style TargetType="{x:Type Border}">

                <Setter Property="BorderBrush" Value="Transparent"/>

                <Setter Property="BorderThickness" Value=""/>

                <Setter Property="Background" Value="{Binding RelativeSource={RelativeSource AncestorType=UserControl, AncestorLevel=1}, Path= Foreground}"/>

                <Setter Property="CornerRadius" Value=""/>

                <Setter Property="Height" Value=""/>

                <Setter Property="Width" Value=""/>

            </Style>

        </StackPanel.Resources>

        <Border x:Name="border4" Margin="0,0,5,0" RenderTransformOrigin="0.5,0.5">

            <Border.RenderTransform>

                <TransformGroup>

                    <ScaleTransform/>

                    <SkewTransform/>

                    <RotateTransform/>

                    <TranslateTransform/>

                </TransformGroup>

            </Border.RenderTransform>

        </Border>

        <Border x:Name="border3" Margin="0,0,5,0" RenderTransformOrigin="0.5,0.5">

            <Border.RenderTransform>

                <TransformGroup>

                    <ScaleTransform/>

                    <SkewTransform/>

                    <RotateTransform/>

                    <TranslateTransform/>

                </TransformGroup>

            </Border.RenderTransform>

        </Border>

        <Border x:Name="border2" Margin="0,0,5,0" RenderTransformOrigin="0.5,0.5">

            <Border.RenderTransform>

                <TransformGroup>

                    <ScaleTransform/>

                    <SkewTransform/>

                    <RotateTransform/>

                    <TranslateTransform/>

                </TransformGroup>

            </Border.RenderTransform>

        </Border>

        <Border x:Name="border1" RenderTransformOrigin="0.5,0.5">

            <Border.RenderTransform>

                <TransformGroup>

                    <ScaleTransform/>

                    <SkewTransform/>

                    <RotateTransform/>

                    <TranslateTransform/>

                </TransformGroup>

            </Border.RenderTransform>

        </Border>

    </StackPanel>

圆点的颜色绑定在用户控件的Foreground上面。在调用控件的时候记得对其Foreground赋值以便显示适合的颜色。

这个动画实际上很简单，分为5个部分：

1.准备部分：准备向前移动

2.正向加速度部分：移动速度越来越快

3.匀速部分：慢速匀速移动

4.负向加速度部分：移动速度越来越慢

5.等待部分：等待所有动画完成

动画代码如下：

<Storyboard x:Key="sbKey" Completed="Storyboard_Completed"  >

            <!--最右边-->

            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.X)" Storyboard.TargetName="border1">

                <EasingDoubleKeyFrame KeyTime="0:0:0" Value="0"/>

                <EasingDoubleKeyFrame KeyTime="0:0:0.8">

                    <EasingDoubleKeyFrame.EasingFunction>

                        <CircleEase EasingMode="EaseOut"/>

                    </EasingDoubleKeyFrame.EasingFunction>

                </EasingDoubleKeyFrame>

                <EasingDoubleKeyFrame KeyTime="0:0:1.2"/>

                <EasingDoubleKeyFrame KeyTime="0:0:2">

                    <EasingDoubleKeyFrame.EasingFunction>

                        <CircleEase EasingMode="EaseIn"/>

                    </EasingDoubleKeyFrame.EasingFunction>

                </EasingDoubleKeyFrame>

                <EasingDoubleKeyFrame KeyTime="0:0:2.6"/>

            </DoubleAnimationUsingKeyFrames>

            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.X)" Storyboard.TargetName="border2">

                <EasingDoubleKeyFrame KeyTime="0:0:0.1" Value="0" x:Name="_2_1">

                    <EasingDoubleKeyFrame.EasingFunction>

                        <CircleEase EasingMode="EaseOut"/>

                    </EasingDoubleKeyFrame.EasingFunction>

                </EasingDoubleKeyFrame>

                <EasingDoubleKeyFrame KeyTime="0:0:0.9" Value="190" x:Name="_2_2">

                    <EasingDoubleKeyFrame.EasingFunction>

                        <CircleEase EasingMode="EaseOut"/>

                    </EasingDoubleKeyFrame.EasingFunction>

                </EasingDoubleKeyFrame>

                <EasingDoubleKeyFrame KeyTime="0:0:1.3" Value="210" x:Name="_2_3"/>

                <EasingDoubleKeyFrame KeyTime="0:0:2.1" Value="400" x:Name="_2_4">

                    <EasingDoubleKeyFrame.EasingFunction>

                        <CircleEase EasingMode="EaseIn"/>

                    </EasingDoubleKeyFrame.EasingFunction>

                </EasingDoubleKeyFrame>

                <EasingDoubleKeyFrame KeyTime="0:0:2.6" Value="400" x:Name="_2_5"/>

            </DoubleAnimationUsingKeyFrames>

            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.X)" Storyboard.TargetName="border3">

                <EasingDoubleKeyFrame KeyTime="0:0:0.2" Value="0" x:Name="_3_1">

                    <EasingDoubleKeyFrame.EasingFunction>

                        <CircleEase EasingMode="EaseOut"/>

                    </EasingDoubleKeyFrame.EasingFunction>

                </EasingDoubleKeyFrame>

                <EasingDoubleKeyFrame KeyTime="0:0:1.0" Value="190" x:Name="_3_2">

                    <EasingDoubleKeyFrame.EasingFunction>

                        <CircleEase EasingMode="EaseOut"/>

                    </EasingDoubleKeyFrame.EasingFunction>

                </EasingDoubleKeyFrame>

                <EasingDoubleKeyFrame KeyTime="0:0:1.4" Value="210" x:Name="_3_3"/>

                <EasingDoubleKeyFrame KeyTime="0:0:2.2" Value="400" x:Name="_3_4">

                    <EasingDoubleKeyFrame.EasingFunction>

                        <CircleEase EasingMode="EaseIn"/>

                    </EasingDoubleKeyFrame.EasingFunction>

                </EasingDoubleKeyFrame>

                <EasingDoubleKeyFrame KeyTime="0:0:2.6" Value="400" x:Name="_3_5"/>

            </DoubleAnimationUsingKeyFrames>

            <!--最左边-->

            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.X)" Storyboard.TargetName="border4">

                <EasingDoubleKeyFrame KeyTime="0:0:0.3" Value="0" x:Name="_4_1">

                    <EasingDoubleKeyFrame.EasingFunction>

                        <CircleEase EasingMode="EaseOut"/>

                    </EasingDoubleKeyFrame.EasingFunction>

                </EasingDoubleKeyFrame>

                <EasingDoubleKeyFrame KeyTime="0:0:1.1" Value="190" x:Name="_4_2">

                    <EasingDoubleKeyFrame.EasingFunction>

                        <CircleEase EasingMode="EaseOut"/>

                    </EasingDoubleKeyFrame.EasingFunction>

                </EasingDoubleKeyFrame>

                <EasingDoubleKeyFrame KeyTime="0:0:1.5" Value="210" x:Name="_4_3"/>

                <EasingDoubleKeyFrame KeyTime="0:0:2.3" Value="400" x:Name="_4_4">

                    <EasingDoubleKeyFrame.EasingFunction>

                        <CircleEase EasingMode="EaseIn"/>

                    </EasingDoubleKeyFrame.EasingFunction>

                </EasingDoubleKeyFrame>

                <EasingDoubleKeyFrame KeyTime="0:0:2.6" Value="400" x:Name="_4_5"/>

            </DoubleAnimationUsingKeyFrames>

        </Storyboard>

由于动画需要自适应宽度，所以部分关键帧的值无法在XAML中表现出来，只有在后台进行动态处理。

当控件的宽度发生变化时需要更新动画部分关键帧：

/// <summary>

        /// 当控件的大小发生变化时

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void UserControl_SizeChanged(object sender, SizeChangedEventArgs e)

        {

            //当控件的宽度发生变化时

            if(e.WidthChanged)

            {

                isNeedUpdateStoryboard = true;

            }

        }

当动画每一次执行完毕后，下一次执行之前，判断是否需要更新部分关键帧，所以响应动画的Completed事件：

/// <summary>

        /// 动画执行完毕

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void Storyboard_Completed(object sender, EventArgs e)

        {

            //每次动画执行完毕后判断是否需要更新动画

            if(isNeedUpdateStoryboard)

            {

                UpdateStoryboard();

            }

            isNeedUpdateStoryboard = false;

            storyboard.Begin(this);

        }

/// <summary>

        /// 更新动画部分关键帧

        /// </summary>

        private void UpdateStoryboard()

        {

            //获取控件的实际宽度，减去4个点占用的宽度

            double realWidth = this.ActualWidth - ;

            //正向加速度占比47.5%

            double _0Width = realWidth * 0.475;

            //匀速部分占比5%

            double _1Width = _0Width + realWidth * 0.05;

            //根据控件的实际大小动态更改动画

            #region 右边第一个

            var _0 = storyboard.Children[] as DoubleAnimationUsingKeyFrames;

            var _0_1 = _0.KeyFrames[] as EasingDoubleKeyFrame;

            var _0_2 = _0.KeyFrames[] as EasingDoubleKeyFrame;

            var _0_3 = _0.KeyFrames[] as EasingDoubleKeyFrame;

            var _0_4 = _0.KeyFrames[] as EasingDoubleKeyFrame;

            _0_1.Value = _0Width;

            _0_2.Value = _1Width;

            _0_3.Value = realWidth;

            _0_4.Value = realWidth;

            #endregion

            #region 右边倒数第二个

            var _1 = storyboard.Children[] as DoubleAnimationUsingKeyFrames;

            var _1_1 = _1.KeyFrames[] as EasingDoubleKeyFrame;

            var _1_2 = _1.KeyFrames[] as EasingDoubleKeyFrame;

            var _1_3 = _1.KeyFrames[] as EasingDoubleKeyFrame;

            var _1_4 = _1.KeyFrames[] as EasingDoubleKeyFrame;

            _1_1.Value = _0Width;

            _1_2.Value = _1Width;

            _1_3.Value = realWidth;

            _1_4.Value = realWidth;

            #endregion

            #region 右边倒数第三个

            var _2 = storyboard.Children[] as DoubleAnimationUsingKeyFrames;

            var _2_1 = _2.KeyFrames[] as EasingDoubleKeyFrame;

            var _2_2 = _2.KeyFrames[] as EasingDoubleKeyFrame;

            var _2_3 = _2.KeyFrames[] as EasingDoubleKeyFrame;

            var _2_4 = _2.KeyFrames[] as EasingDoubleKeyFrame;

            _2_1.Value = _0Width;

            _2_2.Value = _1Width;

            _2_3.Value = realWidth;

            _2_4.Value = realWidth;

            #endregion

            #region 右边倒数第四个

            var _3 = storyboard.Children[] as DoubleAnimationUsingKeyFrames;

            var _3_1 = _3.KeyFrames[] as EasingDoubleKeyFrame;

            var _3_2 = _3.KeyFrames[] as EasingDoubleKeyFrame;

            var _3_3 = _3.KeyFrames[] as EasingDoubleKeyFrame;

            var _3_4 = _3.KeyFrames[] as EasingDoubleKeyFrame;

            _3_1.Value = _0Width;

            _3_2.Value = _1Width;

            _3_3.Value = realWidth;

            _3_4.Value = realWidth;

            #endregion

        }

最后提供动画的开始和结束调用：

/// <summary>

        /// 使进度条开始滚动

        /// </summary>

        public void Start()

        {

            this.Visibility = System.Windows.Visibility.Visible;

            UpdateStoryboard();

            storyboard.Begin(this, true);

        }

        /// <summary>

        /// 使进度条停止滚动

        /// </summary>

        public void Stop()

        {

            this.Visibility = System.Windows.Visibility.Collapsed;

            storyboard.Stop(this);

        }

源代码下载：http://download.csdn.net/detail/lyclovezmy/7598897

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