WPF 过渡效果

http://blog.csdn.net/lhx527099095/article/details/8005095

先上张效果图看看 如果不如您的法眼 可以移步了 或者有更好的效果 可以留言给我 

废话不多说 直接贴代码 一个usercontrol

<UserControl x:Class="LoadingMask_Demo.LoadingWait"
             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"
             IsVisibleChanged="HandleVisibleChanged">
    <UserControl.Background>
        <SolidColorBrush Color="Black" Opacity="0.2"  />
    </UserControl.Background>
    <UserControl.Resources>
        <SolidColorBrush Color="#FF007BE5" x:Key="CirclesColor" />
        <!--<SolidColorBrush Color="Black" x:Key="BackgroundColor" Opacity=".20" />-->
    </UserControl.Resources>

    <Viewbox Width="100" Height="100"
            HorizontalAlignment="Center"
            VerticalAlignment="Center">
        <Grid x:Name="LayoutRoot"
                Background="Transparent"
                ToolTip="Please wait...."
                HorizontalAlignment="Center"
                VerticalAlignment="Center">
            <TextBlock Text="Loading..."  HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="14" Foreground="#FFE3953D" FontWeight="Bold" />
            <Canvas RenderTransformOrigin="0.5,0.5"
                    HorizontalAlignment="Center"
                    VerticalAlignment="Center" Width="120"
                    Height="120" Loaded="HandleLoaded"
                    Unloaded="HandleUnloaded"  >
                <Ellipse x:Name="C0" Width="20" Height="20"
                         Canvas.Left="0"
                         Canvas.Top="0" Stretch="Fill"
                         Fill="{StaticResource CirclesColor}" Opacity="1.0"/>
                <Ellipse x:Name="C1" Width="20" Height="20"
                         Canvas.Left="0"
                         Canvas.Top="0" Stretch="Fill"
                         Fill="{StaticResource CirclesColor}" Opacity="0.9"/>
                <Ellipse x:Name="C2" Width="20" Height="20"
                         Canvas.Left="0"
                         Canvas.Top="0" Stretch="Fill"
                         Fill="{StaticResource CirclesColor}" Opacity="0.8"/>
                <Ellipse x:Name="C3" Width="20" Height="20"
                         Canvas.Left="0"
                         Canvas.Top="0" Stretch="Fill"
                         Fill="{StaticResource CirclesColor}" Opacity="0.7"/>
                <Ellipse x:Name="C4" Width="20" Height="20"
                         Canvas.Left="0"
                         Canvas.Top="0" Stretch="Fill"
                         Fill="{StaticResource CirclesColor}" Opacity="0.6"/>
                <Ellipse x:Name="C5" Width="20" Height="20"
                         Canvas.Left="0"
                         Canvas.Top="0" Stretch="Fill"
                         Fill="{StaticResource CirclesColor}" Opacity="0.5"/>
                <Ellipse x:Name="C6" Width="20" Height="20"
                         Canvas.Left="0"
                         Canvas.Top="0" Stretch="Fill"
                         Fill="{StaticResource CirclesColor}" Opacity="0.4"/>
                <Ellipse x:Name="C7" Width="20" Height="20"
                         Canvas.Left="0"
                         Canvas.Top="0" Stretch="Fill"
                         Fill="{StaticResource CirclesColor}" Opacity="0.3"/>
                <Ellipse x:Name="C8" Width="20" Height="20"
                         Canvas.Left="0"
                         Canvas.Top="0" Stretch="Fill"
                         Fill="{StaticResource CirclesColor}" Opacity="0.2"/>
                <Canvas.RenderTransform>
                    <RotateTransform x:Name="SpinnerRotate"
                         Angle="0" />
                </Canvas.RenderTransform>
            </Canvas>
        </Grid>
    </Viewbox>
</UserControl>


后台代码：


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
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;
using System.Windows.Threading;

namespace LoadingMask_Demo
{
    /// <summary>
    /// Interaction logic for LoadingWait.xaml
    /// </summary>
    public partial class LoadingWait : UserControl
    {
        #region Data
        private readonly DispatcherTimer animationTimer;
        #endregion

        #region Constructor
        public LoadingWait()
        {
            InitializeComponent();

            animationTimer = new DispatcherTimer(
                DispatcherPriority.ContextIdle, Dispatcher);
            animationTimer.Interval = new TimeSpan(0, 0, 0, 0, 90);
        }
        #endregion

        #region Private Methods
        private void Start()
        {
            animationTimer.Tick += HandleAnimationTick;
            animationTimer.Start();
        }

        private void Stop()
        {
            animationTimer.Stop();
            animationTimer.Tick -= HandleAnimationTick;
        }

        private void HandleAnimationTick(object sender, EventArgs e)
        {
            SpinnerRotate.Angle = (SpinnerRotate.Angle + 36) % 360;
        }

        private void HandleLoaded(object sender, RoutedEventArgs e)
        {
            const double offset = Math.PI;
            const double step = Math.PI * 2 / 10.0;

            SetPosition(C0, offset, 0.0, step);
            SetPosition(C1, offset, 1.0, step);
            SetPosition(C2, offset, 2.0, step);
            SetPosition(C3, offset, 3.0, step);
            SetPosition(C4, offset, 4.0, step);
            SetPosition(C5, offset, 5.0, step);
            SetPosition(C6, offset, 6.0, step);
            SetPosition(C7, offset, 7.0, step);
            SetPosition(C8, offset, 8.0, step);
        }

        private void SetPosition(Ellipse ellipse, double offset,
            double posOffSet, double step)
        {
            ellipse.SetValue(Canvas.LeftProperty, 50.0
                + Math.Sin(offset + posOffSet * step) * 50.0);

            ellipse.SetValue(Canvas.TopProperty, 50
                + Math.Cos(offset + posOffSet * step) * 50.0);
        }

        private void HandleUnloaded(object sender, RoutedEventArgs e)
        {
            Stop();
        }

        private void HandleVisibleChanged(object sender,
            DependencyPropertyChangedEventArgs e)
        {
            bool isVisible = (bool)e.NewValue;

            if (isVisible)
                Start();
            else
                Stop();
        }
        #endregion
    }
}

调用的代码也贴出来吧

<Window x:Class="LoadingMask_Demo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525"
        xmlns:local="clr-namespace:LoadingMask_Demo"
        >
    <DockPanel>
        <StackPanel Orientation="Horizontal" DockPanel.Dock="Top">
            <Button  Content="show" Width="70" Height="30" Click="ShowButton_Click" />
            <Button  Content="hide" Width="70" Height="30" Click="HideButton_Click"/>
        </StackPanel>

        <Grid Background="#FF484848" DockPanel.Dock="Bottom">
            <TextBlock Text="asdfasdfasdf" Foreground="White"/>
            <local:LoadingWait x:Name="_loading"  Visibility="Collapsed"/>
        </Grid>
    </DockPanel>
</Window>


后台代码


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
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 LoadingMask_Demo
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void ShowButton_Click(object sender, RoutedEventArgs e)
        {
            this._loading.Visibility = Visibility.Visible;
        }

        private void HideButton_Click(object sender, RoutedEventArgs e)
        {
            this._loading.Visibility = Visibility.Collapsed;
        }

    }
}