VisualStateManager.GoToElementState(FrameworkElement, String, Boolean) Metode

Definisi

Ruang nama:: System.Windows

Rakitan:: PresentationFramework.dll

Penting

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Transisi elemen antara dua status. Gunakan metode ini untuk status transisi yang didefinisikan oleh aplikasi, daripada didefinisikan oleh kontrol.

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

Parameter

stateGroupsRoot: FrameworkElement

Elemen akar yang berisi VisualStateManager.

stateName: String

Status ke transisi.

useTransitions: Boolean

true untuk menggunakan VisualTransition objek untuk transisi antar status; jika tidak, false.

Mengembalikan

Boolean

true jika kontrol berhasil ditransisikan ke status baru; jika tidak, false.

Pengecualian

ArgumentNullException

stateGroupsRoot adalah null.

-atau-

stateName adalah null.

Contoh

Contoh berikut membuat aplikasi yang meminta pengguna untuk menebak angka antara 1 dan 100. Ketika pengguna memasukkan angka, aplikasi menunjukkan apakah tebakan terlalu tinggi, terlalu rendah, atau benar. XAML berikut membuat antarmuka pengguna untuk aplikasi dan menentukan 4 status: TooLow, , TooHighCorrect, dan Guessing. Ketika aplikasi dimulai, aplikasi berada dalam status Guessing . .

<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>

Kode berikut menunjukkan logika aplikasi. Ketika pengguna memasukkan nomor dan mengklik tombol, aplikasi memanggil GoToElementState untuk beralih ke TooHigh, TooLow, atau Correct untuk memberikan umpan balik kepada pengguna tentang tebakan tersebut. Untuk mencoba contoh ini, panggil GenerateNumber metode saat aplikasi dimulai.

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

Keterangan

GoToElementState Panggil metode untuk mengubah status pada elemen di luar ControlTemplate (misalnya, jika Anda menggunakan VisualStateManager dalam atau DataTemplate Window). GoToState Panggil metode jika Anda mengubah status dalam kontrol yang menggunakan VisualStateManager di dalamnya ControlTemplate.

Berlaku untuk

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