本文介绍了如何在Silverlight 4中等待状态转换完成?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我需要更改控件的状态,然后执行一些操作。具体地说,我希望在隐藏控件之前运行动画。我想做这样的事情:
VisualStateManager.GoToState(control, "Hidden", true); // wait until the transition animation is finished
ParentControl.Children.Remove(control);
问题是过渡动画是异步运行的,因此该控件在动画启动后立即从可视化树中删除。
如何等待动画完成?
推荐答案
可以将Storyboard.Complete事件处理程序附加到情节提要,或将VisualStateGroup.CurrentStateChanged事件处理程序附加到VisualStateGroup:
<UserControl
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" mc:Ignorable="d"
x:Class="SilverlightApplication7.MainPage"
Width="640" Height="480">
<Grid x:Name="LayoutRoot" Background="White">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="VisualStateGroup" >
<VisualState x:Name="Hidden">
<Storyboard Completed="OnHidden">
<DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="rectangle" d:IsOptimized="True"/>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Rectangle x:Name="rectangle" Fill="#FFF4F4F5" HorizontalAlignment="Left" Height="136" Margin="48,72,0,0" Opacity="0" Stroke="Black" VerticalAlignment="Top" Width="208"/>
</Grid>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
namespace SilverlightApplication7
{
public partial class MainPage : UserControl
{
public MainPage()
{
// Required to initialize variables
InitializeComponent();
this.Loaded += new RoutedEventHandler(MainPage_Loaded);
}
void MainPage_Loaded(object sender, RoutedEventArgs e)
{
VisualStateManager.GoToState(this, "Hidden", true);
}
private void OnHidden(object storyboard, EventArgs args)
{
}
}
}
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