如何解决如何根据UWP中的文本长度动态更改TextBox宽度?
我尝试过的是
TextBox box=new TextBox{Height=32};
box.TextChanged += TextChanged;
private void TextChanged(object sender,TextChangedEventArgs e)
{
//whenever the textbox text changed,i want to set the width of textbox to current text lenght
}
我不知道如何实现这一目标?有什么方法可以实现这一目标吗?
解决方法
TextBox
的默认行为是根据内部文本的长度来更改控件的宽度。
如果未明确设置TextBox.Width
,则将在MinWidth
和MaxWidth
之间调整TextBox。
赞:
<Grid x:Name="RootGrid">
</Grid>
var box = new TextBox();
box.Height = 32;
box.HorizontalAlignment = HorizontalAlignment.Left;
RootGrid.Children.Add(box);
如果将TextBox放置在网格中,则需要将HorizontalAlignment显式设置为Left
更新
如果您希望与当前文本宽度保持一致,则也可以不监听TextBox.TextChanged
事件来实现。我们可以尝试修改TextBox
的控件模板以删除删除按钮。
<Style TargetType="TextBox" x:Name="CustomTextBoxStyle">
<Setter Property="Foreground" Value="{ThemeResource TextControlForeground}" />
<Setter Property="Background" Value="{ThemeResource TextControlBackground}" />
<Setter Property="BorderBrush" Value="{ThemeResource TextControlBorderBrush}" />
<Setter Property="SelectionHighlightColor" Value="{ThemeResource TextControlSelectionHighlightColor}" />
<Setter Property="BorderThickness" Value="{ThemeResource TextControlBorderThemeThickness}" />
<Setter Property="FontFamily" Value="{ThemeResource ContentControlThemeFontFamily}" />
<Setter Property="FontSize" Value="{ThemeResource ControlContentThemeFontSize}" />
<Setter Property="ScrollViewer.HorizontalScrollMode" Value="Auto" />
<Setter Property="ScrollViewer.VerticalScrollMode" Value="Auto" />
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Hidden" />
<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Hidden" />
<Setter Property="ScrollViewer.IsDeferredScrollingEnabled" Value="False" />
<Setter Property="Padding" Value="{ThemeResource TextControlThemePadding}" />
<Setter Property="UseSystemFocusVisuals" Value="{ThemeResource IsApplicationFocusVisualKindReveal}" />
<Setter Property="ContextFlyout" Value="{StaticResource TextControlCommandBarContextFlyout}" />
<Setter Property="SelectionFlyout" Value="{StaticResource TextControlCommandBarSelectionFlyout}" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="TextBox">
<Grid>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal" />
<VisualState x:Name="Disabled">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="HeaderContentPresenter" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource TextControlHeaderForegroundDisabled}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderElement" Storyboard.TargetProperty="Background">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource TextControlBackgroundDisabled}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderElement" Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource TextControlBorderBrushDisabled}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentElement" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource TextControlForegroundDisabled}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="PlaceholderTextContentPresenter" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{Binding PlaceholderForeground,RelativeSource={RelativeSource TemplatedParent},TargetNullValue={ThemeResource TextControlPlaceholderForegroundDisabled}}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="PointerOver">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderElement" Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource TextControlBorderBrushPointerOver}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderElement" Storyboard.TargetProperty="Background">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource TextControlBackgroundPointerOver}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="PlaceholderTextContentPresenter" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{Binding PlaceholderForeground,TargetNullValue={ThemeResource TextControlPlaceholderForegroundPointerOver}}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentElement" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource TextControlForegroundPointerOver}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Focused">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="PlaceholderTextContentPresenter" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{Binding PlaceholderForeground,TargetNullValue={ThemeResource TextControlPlaceholderForegroundFocused}}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderElement" Storyboard.TargetProperty="Background">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource TextControlBackgroundFocused}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderElement" Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource TextControlBorderBrushFocused}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentElement" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource TextControlForegroundFocused}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentElement" Storyboard.TargetProperty="RequestedTheme">
<DiscreteObjectKeyFrame KeyTime="0" Value="Light" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<ContentPresenter x:Name="HeaderContentPresenter"
Grid.Row="0"
Grid.Column="0"
Grid.ColumnSpan="2"
Content="{TemplateBinding Header}"
ContentTemplate="{TemplateBinding HeaderTemplate}"
FontWeight="Normal"
Foreground="{ThemeResource TextControlHeaderForeground}"
Margin="{ThemeResource TextBoxTopHeaderMargin}"
TextWrapping="Wrap"
VerticalAlignment="Top"
Visibility="Collapsed"
x:DeferLoadStrategy="Lazy" />
<Border x:Name="BorderElement"
Grid.Row="1"
Grid.Column="0"
Grid.RowSpan="1"
Grid.ColumnSpan="2"
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
CornerRadius="{TemplateBinding CornerRadius}"
Control.IsTemplateFocusTarget="True"
MinWidth="{ThemeResource TextControlThemeMinWidth}"
MinHeight="{ThemeResource TextControlThemeMinHeight}" />
<ScrollViewer x:Name="ContentElement"
Grid.Row="1"
Grid.Column="0"
HorizontalScrollMode="{TemplateBinding ScrollViewer.HorizontalScrollMode}"
HorizontalScrollBarVisibility="{TemplateBinding ScrollViewer.HorizontalScrollBarVisibility}"
VerticalScrollMode="{TemplateBinding ScrollViewer.VerticalScrollMode}"
VerticalScrollBarVisibility="{TemplateBinding ScrollViewer.VerticalScrollBarVisibility}"
IsHorizontalRailEnabled="{TemplateBinding ScrollViewer.IsHorizontalRailEnabled}"
IsVerticalRailEnabled="{TemplateBinding ScrollViewer.IsVerticalRailEnabled}"
IsDeferredScrollingEnabled="{TemplateBinding ScrollViewer.IsDeferredScrollingEnabled}"
Margin="{TemplateBinding BorderThickness}"
Padding="{TemplateBinding Padding}" VerticalAlignment="Center"
IsTabStop="False"
AutomationProperties.AccessibilityView="Raw"
ZoomMode="Disabled" />
<TextBlock x:Name="PlaceholderTextContentPresenter"
Grid.Row="1"
Grid.Column="0"
Grid.ColumnSpan="2"
Foreground="{Binding PlaceholderForeground,TargetNullValue={ThemeResource TextControlPlaceholderForeground}}"
Margin="{TemplateBinding BorderThickness}"
Padding="{TemplateBinding Padding}"
Text="{TemplateBinding PlaceholderText}"
TextAlignment="{TemplateBinding TextAlignment}"
TextWrapping="{TemplateBinding TextWrapping}"
IsHitTestVisible="False" />
<ContentPresenter x:Name="DescriptionPresenter"
Grid.Row="2"
Grid.Column="0"
Grid.ColumnSpan="2"
Content="{TemplateBinding Description}"
Foreground="{ThemeResource SystemControlDescriptionTextForegroundBrush}"
AutomationProperties.AccessibilityView="Raw"
x:Load="False"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
var box = new TextBox();
box.Height = 32;
box.Padding = new Thickness(0);
box.Style = CustomTextBoxStyle;
box.HorizontalAlignment = HorizontalAlignment.Left;
RootGrid.Children.Add(box);
对于TextBox,由于不能保证内部字体是等宽字体,因此不容易计算文本宽度,因此使用控件本身的特征来实现目标是一种可行的解决方案。
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