c# - 自定义控件滑动窗口

Question

由于其他原因，我需要 WPF CustomControl。我的目标是 Slide Window，它具有 IsActive 属性。

如果将此属性更改为true，则Slide Window 会从左向右滑入。如果此属性从 true 改回，则 SlideWindow 滑出。

此功能运行良好(我通过 XAML 文件中的触发器 实现)。我还需要将 visibility 设置为 Visibile(在滑入效果开始之前)或 Collapsed(在滑出效果完成之后)。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>

---

在 MainWindow.xaml 中使用 SlideWindowControl 的例子

<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>

---

我也尝试在 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(不显示动画效果)。

如何实现Visibility Property的改变？我需要绑定(bind)到其他组件中的Visibility Property。

Answer 1

解决方案可能是:

1. 将这两个 Storyboard创建为静态资源，并在 BeginStoryboard-Storyboard ({StaticResource SlideIn}) 中引用它们，而不是将它们作为内联子级。

2. 实现他们的 Completed 事件

3. 在 Completed-eventhandler 中，当 IsActive = false 时，您将 Visibility 设置为 Collapsed。
4. 在 FadeIn-click 事件中，您必须先将 Visibility 设置为 Visible，然后再设置 IsActive = true。

这有点不对称，但它适用于我的测试用例。

    <Window x:Class="SO38699140.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:SO38699140"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
  <Window.Resources>

    <Storyboard x:Key="SlideIn" Completed="Storyboard_Completed" >
      <DoubleAnimation Storyboard.TargetProperty="RenderTransform.ScaleX" From="0" Duration="0:00:00.5"  />
    </Storyboard>

    <Storyboard x:Key="SlideOut" Completed="Storyboard_Completed">
      <DoubleAnimation Storyboard.TargetProperty="RenderTransform.ScaleX" From="1" To="0" Duration="0:00:00.5" />
    </Storyboard>


    <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="{StaticResource SlideIn}">
                  </BeginStoryboard>
                </Trigger.EnterActions>

                <!-- Hide -->
                <Trigger.ExitActions>
                  <BeginStoryboard Storyboard="{StaticResource SlideOut}">
                  </BeginStoryboard>
                </Trigger.ExitActions>
              </Trigger>
            </ControlTemplate.Triggers>
          </ControlTemplate>
        </Setter.Value>
      </Setter>
    </Style>
  </Window.Resources>
    <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; -->
      <TextBlock Text="{Binding ElementName=MySlideWindow, Path=Visibility}" />

    </StackPanel>

      <local:SlideWindowControl x:Name="MySlideWindow">
        <TextBlock FontSize="40pt">Super Content!</TextBlock>
      </local:SlideWindowControl>
  </StackPanel>
</Window>

        }

    private void SlideInButton_Click(object sender, RoutedEventArgs e)
    {
      MySlideWindow.Visibility = Visibility.Visible;
      MySlideWindow.IsActive = true;
    }

    private void SlideOutButton_Click(object sender, RoutedEventArgs e)
    {
      MySlideWindow.IsActive = false;
    }

    private void Storyboard_Completed(object sender, EventArgs e)
    {
      if (!MySlideWindow.IsActive)
        MySlideWindow.Visibility = Visibility.Collapsed;

    }