VisualStateManager.GoToElementState(FrameworkElement, String, Boolean) 方法

定义

命名空间:: System.Windows

程序集:: PresentationFramework.dll

重要

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转换两种状态之间的元素。使用此方法转换由应用程序定义的状态，而不是由控件定义。

public:
 static bool GoToElementState(System::Windows::FrameworkElement ^ stateGroupsRoot, System::String ^ stateName, bool useTransitions);

public static bool GoToElementState(System.Windows.FrameworkElement stateGroupsRoot, string stateName, bool useTransitions);

static member GoToElementState : System.Windows.FrameworkElement * string * bool -> bool

Public Shared Function GoToElementState (stateGroupsRoot As FrameworkElement, stateName As String, useTransitions As Boolean) As Boolean

参数

stateGroupsRoot: FrameworkElement

包含 .. 的 VisualStateManager根元素

stateName: String

要转换到的状态。

useTransitions: Boolean

若要使用对象在状态之间转换，则为 ;否则为 < a1/ >。

Boolean

true 如果控件已成功转换为新状态，则为否则，为 false.

例外

ArgumentNullException

stateGroupsRoot 是 null。

-或-

stateName 是 null。

示例

以下示例创建一个应用程序，提示用户猜测介于 1 到 100 之间的数字。当用户输入数字时，应用程序指示猜测是过高、太低还是正确。以下 XAML 为应用程序创建用户界面，并定义 4 种状态： TooLow、 TooHigh、 Correct和 Guessing。应用程序启动时，它 Guessing 处于状态。。

<Grid x:Name="LayoutRoot">
  <Grid.Background>
    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
      <GradientStop Color="#FF022343" Offset="0"/>
      <GradientStop Color="#FF006BD2" Offset="1"/>
    </LinearGradientBrush>
  </Grid.Background>
  <VisualStateManager.VisualStateGroups>
    <VisualStateGroup x:Name="ResultStates">
      <VisualStateGroup.Transitions>
        <VisualTransition GeneratedDuration="0:0:0.5">
          <VisualTransition.GeneratedEasingFunction>
            <CubicEase EasingMode="EaseOut"/>
          </VisualTransition.GeneratedEasingFunction>
        </VisualTransition>
      </VisualStateGroup.Transitions>
      <VisualState x:Name="TooLow">
        <Storyboard>
          <ColorAnimationUsingKeyFrames 
            Storyboard.TargetProperty="(Panel.Background).
              (GradientBrush.GradientStops)[1].(GradientStop.Color)" 
            Storyboard.TargetName="LayoutRoot">
            <EasingColorKeyFrame KeyTime="0" Value="#FFD22700"/>
          </ColorAnimationUsingKeyFrames>
          <ColorAnimationUsingKeyFrames 
            Storyboard.TargetProperty="(Panel.Background).
              (GradientBrush.GradientStops)[0].(GradientStop.Color)" 
            Storyboard.TargetName="LayoutRoot">
            <EasingColorKeyFrame KeyTime="0" Value="#FFE2D7D0"/>
          </ColorAnimationUsingKeyFrames>
          <DoubleAnimationUsingKeyFrames 
            Storyboard.TargetProperty="(UIElement.RenderTransform).
              (TransformGroup.Children)[0].(ScaleTransform.ScaleX)" 
            Storyboard.TargetName="viewbox">
            <EasingDoubleKeyFrame KeyTime="0" Value="1"/>
          </DoubleAnimationUsingKeyFrames>
          <DoubleAnimationUsingKeyFrames 
            Storyboard.TargetProperty="(UIElement.RenderTransform).
              (TransformGroup.Children)[0].(ScaleTransform.ScaleY)" 
            Storyboard.TargetName="viewbox">
            <EasingDoubleKeyFrame KeyTime="0" Value="1"/>
          </DoubleAnimationUsingKeyFrames>
          <DoubleAnimationUsingKeyFrames
            Storyboard.TargetProperty="(Panel.Background).
              (GradientBrush.GradientStops)[0].(GradientStop.Offset)" 
            Storyboard.TargetName="LayoutRoot">
            <EasingDoubleKeyFrame KeyTime="0" Value="0.5"/>
          </DoubleAnimationUsingKeyFrames>
        </Storyboard>
      </VisualState>
      <VisualState x:Name="TooHigh">
        <Storyboard>
          <ColorAnimationUsingKeyFrames 
            Storyboard.TargetProperty="(Panel.Background).
              (GradientBrush.GradientStops)[1].(GradientStop.Color)" 
            Storyboard.TargetName="LayoutRoot">
            <EasingColorKeyFrame KeyTime="0" Value="#FFF3EBE9"/>
          </ColorAnimationUsingKeyFrames>
          <ColorAnimationUsingKeyFrames 
            Storyboard.TargetProperty="(Panel.Background).
              (GradientBrush.GradientStops)[0].(GradientStop.Color)" 
            Storyboard.TargetName="LayoutRoot">
            <EasingColorKeyFrame KeyTime="0" Value="#FFF12807"/>
          </ColorAnimationUsingKeyFrames>
          <DoubleAnimationUsingKeyFrames 
            Storyboard.TargetProperty="(UIElement.RenderTransform).
              (TransformGroup.Children)[0].(ScaleTransform.ScaleX)" 
            Storyboard.TargetName="viewbox">
            <EasingDoubleKeyFrame KeyTime="0" Value="1"/>
          </DoubleAnimationUsingKeyFrames>
          <DoubleAnimationUsingKeyFrames 
            Storyboard.TargetProperty="(UIElement.RenderTransform).
              (TransformGroup.Children)[0].(ScaleTransform.ScaleY)" 
            Storyboard.TargetName="viewbox">
            <EasingDoubleKeyFrame KeyTime="0" Value="1"/>
          </DoubleAnimationUsingKeyFrames>
          <DoubleAnimationUsingKeyFrames 
            Storyboard.TargetProperty="(Panel.Background).
              (GradientBrush.GradientStops)[1].(GradientStop.Offset)" 
            Storyboard.TargetName="LayoutRoot">
            <EasingDoubleKeyFrame KeyTime="0" Value="0.5"/>
          </DoubleAnimationUsingKeyFrames>
        </Storyboard>
      </VisualState>
      <VisualState x:Name="Correct">
        <Storyboard>
          <ColorAnimationUsingKeyFrames 
            Storyboard.TargetProperty="(Panel.Background).
              (GradientBrush.GradientStops)[0].(GradientStop.Color)" 
            Storyboard.TargetName="LayoutRoot">
            <EasingColorKeyFrame KeyTime="0" Value="#FF0E4302"/>
          </ColorAnimationUsingKeyFrames>
          <ColorAnimationUsingKeyFrames 
            Storyboard.TargetProperty="(Panel.Background).
              (GradientBrush.GradientStops)[1].(GradientStop.Color)" 
            Storyboard.TargetName="LayoutRoot">
            <EasingColorKeyFrame KeyTime="0" Value="#FF14D200"/>
          </ColorAnimationUsingKeyFrames>
          <DoubleAnimationUsingKeyFrames 
            Storyboard.TargetProperty="(UIElement.RenderTransform).
              (TransformGroup.Children)[0].(ScaleTransform.ScaleX)" 
            Storyboard.TargetName="viewbox">
            <EasingDoubleKeyFrame KeyTime="0" Value="1"/>
          </DoubleAnimationUsingKeyFrames>
          <DoubleAnimationUsingKeyFrames 
            Storyboard.TargetProperty="(UIElement.RenderTransform).
              (TransformGroup.Children)[0].(ScaleTransform.ScaleY)" 
            Storyboard.TargetName="viewbox">
            <EasingDoubleKeyFrame KeyTime="0" Value="1"/>
          </DoubleAnimationUsingKeyFrames>
        </Storyboard>
      </VisualState>
      <VisualState x:Name="Guessing"/>
    </VisualStateGroup>
  </VisualStateManager.VisualStateGroups>
  <Grid.RowDefinitions>
    <RowDefinition Height="Auto"/>
    <RowDefinition Height="Auto"/>
    <RowDefinition/>
  </Grid.RowDefinitions>
  <Grid.ColumnDefinitions>
    <ColumnDefinition/>
    <ColumnDefinition Width="247"/>
  </Grid.ColumnDefinitions>
  <TextBlock Grid.Row="0" Grid.ColumnSpan="2" Margin="20,5,20,5" 
             FontSize="24" Foreground="White"
             Text="Guess a number between 1 and 100"/>
  <TextBox x:Name="Guess" Grid.Row="1" Margin="20,20,10,10" 
           TextWrapping="Wrap" FontSize="48" 
           TextChanged="OnTypingGuess"/>
  <Button x:Name="GuessButton" Grid.Row="1" Content="Guess" 
          Margin="10,20,20,10" Grid.Column="1" 
          FontSize="48" Click="OnGuess" 
          IsDefault="True"/>
  <Viewbox x:Name="viewbox" Grid.ColumnSpan="2" Grid.Row="2"
           Margin="20,10,20,20" RenderTransformOrigin="0.5,0.5">
    <Viewbox.RenderTransform>
      <TransformGroup>
        <ScaleTransform ScaleX="0" ScaleY="0"/>
        <SkewTransform/>
        <RotateTransform/>
        <TranslateTransform/>
      </TransformGroup>
    </Viewbox.RenderTransform>
    <TextBlock x:Name="Result" TextWrapping="Wrap"/>
  </Viewbox>
</Grid>

以下代码显示了应用程序的逻辑。当用户输入数字并单击该按钮时，应用程序将调用 GoToElementState 转换到 TooHigh该 TooLow按钮，或 Correct 向用户提供有关猜测的反馈。若要尝试此示例，请在应用程序启动时调用 GenerateNumber 该方法。

int number;

private void GenerateNumber()
{
    System.Random r = new System.Random();
    number = r.Next(100) + 1;
}

private void OnGuess(object sender, System.Windows.RoutedEventArgs e)
{
    int guess;

    if (int.TryParse(this.Guess.Text, out guess))
    {
        if (guess < this.number)
        {
            VisualStateManager.GoToElementState(this.LayoutRoot, "TooLow", true);
            this.Result.Text = "Too Low!";
        }
        else if (guess > this.number)
        {
            VisualStateManager.GoToElementState(this.LayoutRoot, "TooHigh", true);
            this.Result.Text = "Too High!";
        }
        else
        {
            VisualStateManager.GoToElementState(this.LayoutRoot, "Correct", true);
            this.Result.Text = "Correct!";
        }
    }
}

private void OnTypingGuess(object sender, System.Windows.Controls.TextChangedEventArgs e)
{
    VisualStateManager.GoToElementState(this.LayoutRoot, "Guessing", true);
    this.Result.Text = "";
}

Private number As Integer

Private Sub GenerateNumber()
    Dim r As New System.Random()
    number = r.Next(100) + 1
End Sub

Private Sub OnGuess(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs)
    Dim guess As Integer

    If Integer.TryParse(Me.Guess.Text, guess) Then
        If guess < Me.number Then
            VisualStateManager.GoToElementState(Me.LayoutRoot, "TooLow", True)
            Me.Result.Text = "Too Low!"
        ElseIf guess > Me.number Then
            VisualStateManager.GoToElementState(Me.LayoutRoot, "TooHigh", True)
            Me.Result.Text = "Too High!"
        Else
            VisualStateManager.GoToElementState(Me.LayoutRoot, "Correct", True)
            Me.Result.Text = "Correct!"
        End If
    End If
End Sub

Private Sub OnTypingGuess(ByVal sender As Object, ByVal e As System.Windows.Controls.TextChangedEventArgs)
    VisualStateManager.GoToElementState(Me.LayoutRoot, "Guessing", True)
    Me.Result.Text = ""
End Sub

注解

GoToElementState调用该方法以更改元素外部ControlTemplate的状态（例如，如果在某个元素中使用VisualStateManager DataTemplate或Window）。 GoToState如果要更改控件中使用该VisualStateManager控件ControlTemplate中的状态，请调用该方法。

适用于

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VisualStateManager.GoToElementState(FrameworkElement, String, Boolean) 方法

定义

参数

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例外

示例

注解

适用于

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