【发布时间】：2016-08-01 12:38:46
【问题描述】：
由于其他原因，我需要 WPF CustomControl。我的目标是 Slide Window，它具有 IsActive 属性。
如果此属性更改为 true，则幻灯片窗口从左向右滑入。如果此属性从 true 变回，则 SlideWindow 滑出。
此功能运行良好（我通过 XAML 文件中的 triggers 来实现）。我还需要将 visibility 设置为 Visibile（在滑入效果开始之前）或 Collapsed（在滑出效果完成后）。这就是问题所在。
SlideWindowControl.cs
using System;
using System.Windows;
using System.Windows.Controls;
namespace SlideWindowTest
{
public class SlideWindowControl : ContentControl
{
public static readonly DependencyProperty IsActiveProperty = DependencyProperty.Register(
"IsActive", typeof(Boolean), typeof(SlideWindowControl), new PropertyMetadata(true));
static SlideWindowControl()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(SlideWindowControl), new FrameworkPropertyMetadata(typeof(SlideWindowControl)));
}
public Boolean IsActive
{
get { return (Boolean)GetValue(IsActiveProperty); }
set { SetValue(IsActiveProperty, value); }
}
}
}
SlideWindowControl
对应的Generic.xaml<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:SlideWindowTest">
<Style TargetType="{x:Type local:SlideWindowControl}">
<Setter Property="RenderTransform">
<Setter.Value>
<ScaleTransform ScaleX="1"/>
</Setter.Value>
</Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:SlideWindowControl}">
<Border Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
x:Name="Root">
<StackPanel Orientation="Vertical">
<Grid Background="Black">
<TextBlock Text="HEADER" Foreground="White" Margin="17" FontSize="20pt" />
</Grid>
<ContentPresenter />
</StackPanel>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsActive" Value="True">
<!-- Show -->
<Trigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<!-- Visibility change cause trouble
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Duration="0" BeginTime="0">
<DiscreteObjectKeyFrame Value="{x:Static Visibility.Visible}" />
</ObjectAnimationUsingKeyFrames>
-->
<DoubleAnimation Storyboard.TargetProperty="RenderTransform.ScaleX" From="0" Duration="0:00:00.5" />
</Storyboard>
</BeginStoryboard>
</Trigger.EnterActions>
<!-- Hide -->
<Trigger.ExitActions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation Storyboard.TargetProperty="RenderTransform.ScaleX" From="1" To="0" Duration="0:00:00.5"/>
<!-- Visibility change cause trouble
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Duration="0" BeginTime="0:00:00.5">
<DiscreteObjectKeyFrame Value="{x:Static Visibility.Collapsed}" />
</ObjectAnimationUsingKeyFrames>
-->
</Storyboard>
</BeginStoryboard>
</Trigger.ExitActions>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>
MainWindow.xaml
中SlideWindowControl的使用示例<Window x:Class="SlideWindowTest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:SlideWindowTest"
Title="MainWindow" Height="350" Width="525">
<StackPanel Orientation="Vertical">
<StackPanel Orientation="Horizontal">
<Button Content="Slide In" Click="SlideInButton_Click"/> <!-- InMainWindow.xaml.cs set MySlideWindow.IsActive = true; -->
<Button Content="Slide Out" Click="SlideOutButton_Click" /> <!-- InMainWindow.xaml.cs set MySlideWindow.IsActive = false; -->
</StackPanel>
<local:SlideWindowControl x:Name="MySlideWindow">
<TextBlock FontSize="40pt">Super Content!</TextBlock>
</local:SlideWindowControl>
</StackPanel>
</Window>
我尝试在 Generic.xaml 的触发器中为 SlideWindowControl 设置 Visibility Property（请参阅注释代码），但它破坏了整体触发器（不显示动画效果）。
如何实现可见性属性的改变？我需要绑定到其他组件中的Visibility Property。
【问题讨论】：
标签： c# wpf xaml custom-controls