如何更改文本块背景？

Question

这是我的xaml structure

<stackpanel>
  <textblock Text="A"></textblock>
  <textblock Text="B"></textblock>
</stackpanel>

Stackpanel,可以循环生成更多相同的结构

如何在单击时更改 texblock 的背景颜色？

更新：I just want change on xaml file not using C#.

默认我是黄色的，但是当我点击一个文本块时，它的背景会变成蓝色。

更新 2：如果单击 A，A 将变为蓝色，直到我单击另一个。

详情：

我点A(A is yellow),A会变成蓝色==> A是蓝色
我点击B(B is yellow and A is blue)，B会变成蓝色，A会变成黄色

更新 3：这个怎么样？

<stackpanel>
      <textblock Text="A"></textblock>
</stackpanel>

<stackpanel>
      <textblock Text="A"></textblock>
</stackpanel>
<stackpanel>
      <textblock Text="A"></textblock>
</stackpanel>

问题同上

谢谢！

Answer 1

以编程方式：

textBlock1.Background = new SolidColorBrush(Colors.Yellow);

在XAML中：

<TextBlock Name="textBlock1">
    <TextBlock.Background>
        <SolidColorBrush Color="Yellow" />
    </TextBlock.Background>
</TextBlock>

要在单击文本块时更改背景颜色，您应该使用带有触发器的自定义样式。这并不难，如果您将搜索或询问有关使用样式和触发器的信息。你绝对不应该在 XAML 设计模式中为此使用 C#。

Answer 2

使用 EventTrigger 和 Color Animation 您可以在 MouseDown 上更改 TextBlock 背景颜色或 MouseLeave

xaml代码

 <StackPanel>
    <StackPanel.Resources>
        <Style TargetType="TextBlock">
            <Style.Triggers>
                <EventTrigger RoutedEvent="MouseDown">
                    <BeginStoryboard>
                        <Storyboard>
                            <ColorAnimation Storyboard.TargetProperty="Background.Color" From="Yellow" To="Blue" Duration="0:0:0.1"></ColorAnimation>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
                <EventTrigger RoutedEvent="MouseLeave">
                    <BeginStoryboard>
                        <Storyboard>
                            <ColorAnimation Storyboard.TargetProperty="Background.Color" From="Blue" To="Yellow" Duration="0:0:0.1"></ColorAnimation>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
            </Style.Triggers>
        </Style>
    </StackPanel.Resources>
    <TextBlock Text="A" Background="Yellow"></TextBlock>
    <TextBlock Text="B" Background="Yellow"></TextBlock>
</StackPanel>

更新

使用 TextBox with 属性 IsReadOnly=True 而不是文本块。

    <StackPanel>
    <StackPanel.Resources>
        <Style TargetType="TextBox"> 
            <Setter Property="Background" Value="Yellow"></Setter>
            <Setter Property="BorderThickness" Value="0"></Setter> 
            <Setter Property="IsReadOnly" Value="True"></Setter>
            <Style.Triggers>
                <EventTrigger RoutedEvent="TextBox.GotFocus">
                    <BeginStoryboard>
                        <Storyboard>
                            <ColorAnimation Storyboard.TargetProperty="Background.Color" From="Yellow" To="Blue" Duration="0:0:0.1"></ColorAnimation>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
                <EventTrigger RoutedEvent="TextBox.LostFocus">
                    <BeginStoryboard>
                        <Storyboard>
                            <ColorAnimation Storyboard.TargetProperty="Background.Color" From="Blue" To="Yellow" Duration="0:0:0.1"></ColorAnimation>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
            </Style.Triggers>
        </Style>
    </StackPanel.Resources>
    <TextBox Text="A"></TextBox>
    <TextBox Text="A"></TextBox>
</StackPanel>

Answer 3

  <TextBlock Text="Hello, styled world!" FontSize="28" HorizontalAlignment="Center" VerticalAlignment="Center">
                <TextBlock.Style>
                    <Style TargetType="TextBlock">
                        <Setter Property="Background" Value="Yellow"></Setter>
                        <Style.Triggers>
                            <Trigger Property="IsMouseOver" Value="True">
                                <Setter Property="Background" Value="Blue" />
                                <Setter Property="TextDecorations" Value="Underline" />
                            </Trigger>
                        </Style.Triggers>
                    </Style>
                </TextBlock.Style>
            </TextBlock>

Answer 4

这很可能是您问题的解决方案。正如我指出的那样，由于您希望一个控件依赖于其他控件的各种要求的性质，因此无法实现仅 xaml 的解决方案。

你当然可以 fiddle 处理其余部分。

public class RadioTextblock : TextBlock
{
    static RadioTextblock()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(RadioTextblock), new FrameworkPropertyMetadata(typeof(RadioTextblock)));
    }

    public static readonly DependencyProperty GroupProperty = DependencyProperty.Register(
        "Group", typeof (string), typeof (RadioTextblock), new PropertyMetadata(string.Empty));

    public string Group
    {
        get { return (string) GetValue(GroupProperty); }
        set { SetValue(GroupProperty, value); }
    }

    public static readonly DependencyProperty ActiveColorProperty = DependencyProperty.Register(
        "ActiveColor", typeof (Brush), typeof (RadioTextblock), new PropertyMetadata(default(Brush)));

    public Brush ActiveColor
    {
        get { return (Brush) GetValue(ActiveColorProperty); }
        set { SetValue(ActiveColorProperty, value); }
    }

    public static readonly DependencyProperty RestorationColorProperty = DependencyProperty.Register(
        "RestorationColor", typeof (Brush), typeof (RadioTextblock), new PropertyMetadata(default(Brush)));

    public Brush RestorationColor
    {
        get { return (Brush) GetValue(RestorationColorProperty); }
        set { SetValue(RestorationColorProperty, value); }
    }

    protected override void OnInitialized(EventArgs e)
    {
        base.OnInitialized(e);
        // there may be a better hook for this. but i'm not writing custom controls that often. anything after styles are applied should be good
        RestorationColor = Background;
    }

    protected override void OnPreviewMouseDown(MouseButtonEventArgs e)
    {
        RestoreOtherBackgrounds(this);
        base.OnPreviewMouseDown(e);
    }

    private void RestoreOtherBackgrounds(RadioTextblock radioTextblock)
    {
        var topParent = GetTopMostParent(radioTextblock);
        var controlsWithGroup = GetChildrenRecursive<RadioTextblock>(topParent).ToLookup(d => (string)d.GetValue(GroupProperty));
        var similar = controlsWithGroup[radioTextblock.Group];
        foreach (var match in similar)
        {
            if (match == radioTextblock)
            {
                match.Background = ActiveColor;
            }
            else
            {
                match.Background = match.RestorationColor;
            }
        }
    }

    private DependencyObject GetTopMostParent(RadioTextblock radioTextblock)
    {
        DependencyObject current = radioTextblock;
        while (current != null)
        {
            var cParent = VisualTreeHelper.GetParent(current);
            if (cParent == null || cParent == current)
                break;

            current = cParent;
        }

        return current;
    }

    private IEnumerable<T> GetChildrenRecursive<T>(DependencyObject current) where T : DependencyObject
    {
        T casted;
        var childCount = VisualTreeHelper.GetChildrenCount(current);
        for (int i = 0; i < childCount; i++)
        {
            var currentChild = VisualTreeHelper.GetChild(current, i);
            casted = currentChild as T;
            if(casted != null)
                yield return casted;

            foreach (var subChild in GetChildrenRecursive<T>(currentChild))
            {
                if (subChild != null)
                    yield return casted;
            }
        }
    }
}

Answer 5

改变你的XAML结构如下

xmlns:local="clr-namespace:your_assembly_Name"
.....  
<StackPanel>
    <StackPanel.Resources>
        <local:BackgroundConverter x:Key="backgroundConverter"/>
        <Style TargetType="TextBlock">
            <EventSetter Event="MouseDown" Handler="TextBlockMouseDownEvent" />
            <Setter Property="Background">
                <Setter.Value>
                    <MultiBinding Converter="{StaticResource backgroundConverter}">
                        <Binding Path="Name" RelativeSource="{RelativeSource Self}"/>
                        <Binding Path="SelectedTextBlockName"/>
                    </MultiBinding>
                </Setter.Value>
            </Setter>
        </Style>
    </StackPanel.Resources>
    <TextBlock x:Name="text1" Text="Header"/>
    <TextBlock x:Name="text2" Text="Header"/>
    <TextBlock x:Name="text3" Text="Header"/>
    <TextBlock x:Name="text4" Text="Header"/>
</StackPanel>

使用以下 IMultiValueConverter 并在您的代码后面添加 TextBlockMouseDownEvent 事件处理程序和一个 DependencyProperty。

////DependencyProperty
public string SelectedTextBlockName
{
    get { return (string)GetValue(SelectedTextBlockNameProperty); }
    set { SetValue(SelectedTextBlockNameProperty, value); }
}

// Using a DependencyProperty as the backing store for SelectedTextBlock.  This enables animation, styling, binding, etc...
public static readonly DependencyProperty SelectedTextBlockNameProperty =
    DependencyProperty.Register("SelectedTextBlockName", typeof(string), typeof(Class_Name), new PropertyMetadata(null));

.......

private void TextBlockMouseDownEvent(object sender, MouseButtonEventArgs e)
{
    TextBlock txtBlock = sender as TextBlock;
    if (txtBlock != null)
    {
        SelectedTextBlockName = txtBlock.Name;
    }
}

.......

public class BackgroundConverter : IMultiValueConverter
{
    /// <summary>
    /// Values[0] = Name of TextBlock
    /// values[1] = SelectedTextBlockName
    /// If matches then it is selected
    /// </summary>
    public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (values[0] != null && values[1] != null && values[0].ToString() == values[1].ToString())
            return new SolidColorBrush(Colors.Blue);
        return new SolidColorBrush(Colors.White);
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

如果您想设置默认的 SelectedTextBlock，那么只需设置您想要作为默认选择的 TextBlock 名称。像这样：

SelectedTextBlockName = "text1";

如何更改文本块背景？

How to change textblock background?

c#

wpf

xaml

textblock