Windows Phone 8 滚动文本框的内容

Question

问题：当我在TextBox 中输入大文本时，我在TextBox 中输入时看不到指针

说明：

1. 每当用户在TextBox 中输入文本时，如果输入的文本很大，则应启用滚动。
2. ScrollViewer 仅在 ScrollViewer 的高度内显示 TextBox 的内容
3. 当我输入几行文本时出现问题（指针不可见）
4. 然后我向下滚动查看指针，再输入几行后问题再次出现

代码：

<Grid x:Name="LayoutRoot" Background="Transparent">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>

    <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
        <TextBlock Text="Scroll Content Inside Textbox" Style="{StaticResource PhoneTextNormalStyle}" Margin="25,0,180,0"/>
    </StackPanel>

    <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">

        <ScrollViewer Height="200"
                      VerticalAlignment="Top">
            <TextBox x:Name="txtBody"
                     Width="200"
                     AcceptsReturn="True"
                     />
        </ScrollViewer>
    </Grid>

</Grid>

Answer 1

MainPage.xaml

<Grid x:Name="LayoutRoot" Background="Transparent">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>

    <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
        <TextBlock Text="Scroll Content Inside Textbox" Style="{StaticResource PhoneTextNormalStyle}" Margin="25,0,180,0"/>
    </StackPanel>

    <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">

        <ScrollViewer Height="200"
                Name="scrlView"
                VerticalAlignment="Top">
                <TextBox x:Name="txtBody"
                     Width="200"
                     AcceptsReturn="True" KeyUp="txtBody_KeyUp"/>
        </ScrollViewer>

    </Grid>
</Grid>

MainPage.xaml.cs

    private void txtBody_KeyUp(object sender, System.Windows.Input.KeyEventArgs e)
    {
        if (e.Key == System.Windows.Input.Key.Enter)
        {
            scrlView.UpdateLayout();
            scrlView.ScrollToVerticalOffset(scrlView.ExtentHeight);
        }
    }

技巧：

(1) 将ScrollViewer命名为scrlView

(2) 我在TextBox的KeyUp事件中写了代码

(3) 每当用户按下回车键，然后通过代码向下滚动文本框

感谢大家的宝贵时间和支持

Answer 2

你要做的就是基本上把文本框的内容放在滚动查看器中。 这是旧代码，但您应该能够看到指针并按需滚动。 （据我记忆，我现在没有可能测试它）
您可能还发现有必要将此文本框放在 Scrollviewer 后面，但没有它也可以工作。不幸的是，文本框的高度必须是硬编码的（如果你把它放在 scrollvierer 高度，或者 scrollviewer 的 maxheight 必须硬编码。） 希望它有所帮助（并且有效）！

<ScrollViewer Grid.Column="1"
                VerticalScrollBarVisibility="Auto"
                HorizontalScrollBarVisibility="Disabled" 
                MaxHeight="150"
                Name="scroll"
                />





<TextBox Grid.Column="1" Text="text" InputScope="Chat"
                         Name="message"
                         Height="Auto"
                         Style="{StaticResource ScrollableTextBox}"
                         TextWrapping="Wrap"
                         AcceptsReturn="True"  TextChanged="MessageTextChanged" />


<Style x:Key="ScrollableTextBox" TargetType="TextBox">
            <Setter Property="FontFamily" Value="{StaticResource PhoneFontFamilyNormal}"/>
            <Setter Property="FontSize" Value="{StaticResource PhoneFontSizeMediumLarge}"/>
            <Setter Property="Background" Value="{StaticResource PhoneTextBoxBrush}"/>
            <Setter Property="Foreground" Value="{StaticResource PhoneTextBoxForegroundBrush}"/>
            <Setter Property="BorderBrush" Value="{StaticResource PhoneTextBoxBrush}"/>
            <Setter Property="SelectionBackground" Value="{StaticResource PhoneAccentBrush}"/>
            <Setter Property="SelectionForeground" Value="{StaticResource PhoneTextBoxSelectionForegroundBrush}"/>
            <Setter Property="BorderThickness" Value="{StaticResource PhoneBorderThickness}"/>
            <Setter Property="Padding" Value="2"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="TextBox">
                        <Grid Background="Transparent">
                            <VisualStateManager.VisualStateGroups>
                                <VisualStateGroup x:Name="CommonStates">
                                    <VisualState x:Name="Normal"/>
                                    <VisualState x:Name="MouseOver"/>
                                    <VisualState x:Name="Disabled">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="MainBorder">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="Transparent"/>
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="MainBorder">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneDisabledBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentElement">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneDisabledBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="ReadOnly">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="MainBorder">
                                                <DiscreteObjectKeyFrame KeyTime="0">
                                                    <DiscreteObjectKeyFrame.Value>
                                                        <Visibility>Collapsed</Visibility>
                                                    </DiscreteObjectKeyFrame.Value>
                                                </DiscreteObjectKeyFrame>
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="ReadonlyBorder">
                                                <DiscreteObjectKeyFrame KeyTime="0">
                                                    <DiscreteObjectKeyFrame.Value>
                                                        <Visibility>Visible</Visibility>
                                                    </DiscreteObjectKeyFrame.Value>
                                                </DiscreteObjectKeyFrame>
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="ReadonlyBorder">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="ReadonlyBorder">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentElement">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxReadOnlyBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                </VisualStateGroup>
                                <VisualStateGroup x:Name="FocusStates">
                                    <VisualState x:Name="Focused">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="MainBorder">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxEditBackgroundBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="MainBorder">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxEditBorderBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Unfocused"/>
                                </VisualStateGroup>
                            </VisualStateManager.VisualStateGroups>
                            <Border x:Name="MainBorder" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Margin="{StaticResource PhoneTouchTargetOverhang}"/>
                            <Border x:Name="ReadonlyBorder" BorderBrush="{StaticResource PhoneDisabledBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="Transparent" Margin="{StaticResource PhoneTouchTargetOverhang}" Visibility="Collapsed"/>
                            <Border BorderBrush="Transparent" BorderThickness="{TemplateBinding BorderThickness}" Background="Transparent" Margin="{StaticResource PhoneTouchTargetOverhang}">
                                <ScrollViewer x:Name="ContentElement" BorderThickness="0" HorizontalContentAlignment="Stretch" Margin="{StaticResource PhoneTextBoxInnerMargin}" Padding="{TemplateBinding Padding}" VerticalContentAlignment="Stretch"/>
                            </Border>
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

Answer 3

尝试将文本框包装在 StackPanel 中，以便它可以扩展。例如：

<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
  <ScrollViewer HorizontalScrollBarVisibility="Auto">
    <StackPanel VerticalAlignment="Top" HorizontalAlignment="Left">
      <TextBox x:Name="txtBody"
                     Width="200"
                     AcceptsReturn="True"
                     />
    </StackPanel>
  </ScrollViewer>
</Grid>