Question

当我尝试为主窗口设置动画时，只有高度会变得生动，但是当我使用相同的代码为我的网格设置动画时它工作正常。请帮助我，因为我是wpf的新手

<Window x:Class="TestingDemo.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:local="clr-namespace:TestingDemo"
    mc:Ignorable="d"
    Name="myWindow"
    AllowsTransparency="True"
    WindowStyle="None"
    Background="Blue"
    Title="MainWindow" Height="100" Width="100">
<Grid>
    <TextBlock MouseDown="TextBlock_MouseDown">
        OpenMe
        <TextBlock.Triggers>
            <EventTrigger RoutedEvent="MouseDown">
                <BeginStoryboard>
                    <Storyboard>
                        <DoubleAnimation
                            Storyboard.TargetName="myWindow"
                            Storyboard.TargetProperty="Height"
                            From="100"
                            To="600"></DoubleAnimation>
                        <DoubleAnimation
                            Storyboard.TargetName="myWindow"
                            Storyboard.TargetProperty="Width"
                            From="100"
                            To="600"></DoubleAnimation>


                    </Storyboard>
                </BeginStoryboard>
            </EventTrigger>
        </TextBlock.Triggers>
    </TextBlock>
   </Grid>
</Window>

w ^

Answer 1

很遗憾，更改Width的{{1}}和Height是分开且昂贵的。 Window的{{1}}和Width是WPF依赖项属性，但它们以本机方式工作。 Height的相同属性以WPF方式工作。

建议您避免为Window的{{1}}和Grid属性设置动画。相反，动画内部框架元素。

我在下面尝试过这段代码并且工作不顺利：

Width

Answer 2

这就是我正在做的事情，它就像一个魅力：

  <Window.Triggers>
        <EventTrigger RoutedEvent="Loaded">
            <BeginStoryboard>
                <Storyboard>
                    <DoubleAnimation Storyboard.TargetProperty="Width" From="0" To="yourWidth" Duration="0:0:1" FillBehavior="HoldEnd" AutoReverse="False" />
                    <DoubleAnimation Storyboard.TargetProperty="Height" From="0" To="yourHeight" Duration="0:0:3" FillBehavior="HoldEnd" AutoReverse="False"/>
                </Storyboard>
            </BeginStoryboard>
        </EventTrigger>
 </Window.Triggers>

    I have hooked it for Window Loaded event but you can change it as you wish but the key is If you want smooth animation then you have to manually push frames in a timer or thread like:

  /// <summary>
    /// 
    /// </summary>
    public static class DispatcherHelper
    {
        /// <summary>
        /// Simulate Application.DoEvents function of <see cref=" System.Windows.Forms.Application"/> class.
        /// </summary>
        [SecurityPermissionAttribute ( SecurityAction.Demand, Flags = SecurityPermissionFlag.UnmanagedCode )]
        public static void DoEvents ( )
        {
            DispatcherFrame frame = new DispatcherFrame ( );
            Dispatcher.CurrentDispatcher.BeginInvoke ( DispatcherPriority.Background,
                new DispatcherOperationCallback ( ExitFrames ), frame );

            try
            {
                Dispatcher.PushFrame ( frame );
            }
            catch ( InvalidOperationException )
            {
            }
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="f"></param>
        /// <returns></returns>
        private static object ExitFrames ( object frame )
        {
            ( ( DispatcherFrame ) frame ).Continue = false;

            return null;
        }
    }

请小心，因为不建议手动推框，但如果你知道自己在做什么，那就自己敲门吧！：）

WPF双动画无法正常工作C＃

2 个答案: