如何允许TextBlock的文本是可选的?
我试图让它通过显示文本使用只读文本框样式看起来像一个文本块，但这不会在我的情况下工作，因为一个文本框没有内联。换句话说，如何使它具有可选性?
当前回答
为torvin的代码添加了Selection & SelectionChanged事件
public class SelectableTextBlock : TextBlock
{
static readonly Type TextEditorType
= Type.GetType("System.Windows.Documents.TextEditor, PresentationFramework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35");
static readonly PropertyInfo IsReadOnlyProp
= TextEditorType.GetProperty("IsReadOnly", BindingFlags.Instance | BindingFlags.NonPublic);
static readonly PropertyInfo TextViewProp
= TextEditorType.GetProperty("TextView", BindingFlags.Instance | BindingFlags.NonPublic);
static readonly MethodInfo RegisterMethod
= TextEditorType.GetMethod("RegisterCommandHandlers",
BindingFlags.Static | BindingFlags.NonPublic, null, new[] { typeof(Type), typeof(bool), typeof(bool), typeof(bool) }, null);
static readonly Type TextContainerType
= Type.GetType("System.Windows.Documents.ITextContainer, PresentationFramework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35");
static readonly PropertyInfo TextContainerTextViewProp
= TextContainerType.GetProperty("TextView");
static readonly PropertyInfo TextContainerTextSelectionProp
= TextContainerType.GetProperty("TextSelection");
static readonly PropertyInfo TextContainerProp = typeof(TextBlock).GetProperty("TextContainer", BindingFlags.Instance | BindingFlags.NonPublic);
static void RegisterCommandHandlers(Type controlType, bool acceptsRichContent, bool readOnly, bool registerEventListeners)
{
RegisterMethod.Invoke(null, new object[] { controlType, acceptsRichContent, readOnly, registerEventListeners });
}
static SelectableTextBlock()
{
FocusableProperty.OverrideMetadata(typeof(SelectableTextBlock), new FrameworkPropertyMetadata(true));
RegisterCommandHandlers(typeof(SelectableTextBlock), true, true, true);
// remove the focus rectangle around the control
FocusVisualStyleProperty.OverrideMetadata(typeof(SelectableTextBlock), new FrameworkPropertyMetadata((object)null));
}
//private readonly TextEditorWrapper _editor;
object? textContainer;
object? editor;
public TextSelection TextSelection { get; private set; }
public SelectableTextBlock()
{
textContainer = TextContainerProp.GetValue(this);
editor = Activator.CreateInstance(TextEditorType, BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.CreateInstance,
null, new[] { textContainer, this, false }, null);
IsReadOnlyProp.SetValue(editor, true);
TextViewProp.SetValue(editor, TextContainerTextViewProp.GetValue(textContainer));
TextSelection = (TextSelection)TextContainerTextSelectionProp.GetValue(textContainer);
TextSelection.Changed += (s, e) => OnSelectionChanged?.Invoke(this, e);
}
public event EventHandler OnSelectionChanged;
}
其他回答
应用这种风格到你的文本框，这就是它(灵感来自这篇文章):
<Style x:Key="SelectableTextBlockLikeStyle" TargetType="TextBox" BasedOn="{StaticResource {x:Type TextBox}}">
<Setter Property="IsReadOnly" Value="True"/>
<Setter Property="IsTabStop" Value="False"/>
<Setter Property="BorderThickness" Value="0"/>
<Setter Property="Background" Value="Transparent"/>
<Setter Property="Padding" Value="-2,0,0,0"/>
<!-- The Padding -2,0,0,0 is required because the TextBox
seems to have an inherent "Padding" of about 2 pixels.
Without the Padding property,
the text seems to be 2 pixels to the left
compared to a TextBlock
-->
<Style.Triggers>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsMouseOver" Value="False" />
<Condition Property="IsFocused" Value="False" />
</MultiTrigger.Conditions>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TextBox}">
<TextBlock Text="{TemplateBinding Text}"
FontSize="{TemplateBinding FontSize}"
FontStyle="{TemplateBinding FontStyle}"
FontFamily="{TemplateBinding FontFamily}"
FontWeight="{TemplateBinding FontWeight}"
TextWrapping="{TemplateBinding TextWrapping}"
Foreground="{DynamicResource NormalText}"
Padding="0,0,0,0"
/>
</ControlTemplate>
</Setter.Value>
</Setter>
</MultiTrigger>
</Style.Triggers>
</Style>
我已经实现了SelectableTextBlock在我的开源控件库。你可以这样使用它:
<jc:SelectableTextBlock Text="Some text" />
只是在FlowDocumentScrollViewer中使用FlowDocument，将你的内联传递给元素。 你可以控制元素的样式，在我的例子中，我添加了一个小边框。
<FlowDocumentScrollViewer Grid.Row="2" Margin="5,3" BorderThickness="1"
BorderBrush="{DynamicResource Element.Border}"
VerticalScrollBarVisibility="Auto">
<FlowDocument>
<Paragraph>
<Bold>Some bold text in the paragraph.</Bold>
Some text that is not bold.
</Paragraph>
<List>
<ListItem>
<Paragraph>ListItem 1</Paragraph>
</ListItem>
<ListItem>
<Paragraph>ListItem 2</Paragraph>
</ListItem>
<ListItem>
<Paragraph>ListItem 3</Paragraph>
</ListItem>
</List>
</FlowDocument>
</FlowDocumentScrollViewer>
TextBlock没有模板。因此，为了实现这一点，我们需要使用一个文本框，其风格被改变为一个文本块的行为。
<Style x:Key="TextBlockUsingTextBoxStyle" BasedOn="{x:Null}" TargetType="{x:Type TextBox}">
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
<Setter Property="Background" Value="Transparent"/>
<Setter Property="BorderBrush" Value="{StaticResource TextBoxBorder}"/>
<Setter Property="BorderThickness" Value="0"/>
<Setter Property="Padding" Value="1"/>
<Setter Property="AllowDrop" Value="true"/>
<Setter Property="FocusVisualStyle" Value="{x:Null}"/>
<Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst"/>
<Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TextBox}">
<TextBox BorderThickness="{TemplateBinding BorderThickness}" IsReadOnly="True" Text="{TemplateBinding Text}" Background="{x:Null}" BorderBrush="{x:Null}" />
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
为torvin的代码添加了Selection & SelectionChanged事件
public class SelectableTextBlock : TextBlock
{
static readonly Type TextEditorType
= Type.GetType("System.Windows.Documents.TextEditor, PresentationFramework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35");
static readonly PropertyInfo IsReadOnlyProp
= TextEditorType.GetProperty("IsReadOnly", BindingFlags.Instance | BindingFlags.NonPublic);
static readonly PropertyInfo TextViewProp
= TextEditorType.GetProperty("TextView", BindingFlags.Instance | BindingFlags.NonPublic);
static readonly MethodInfo RegisterMethod
= TextEditorType.GetMethod("RegisterCommandHandlers",
BindingFlags.Static | BindingFlags.NonPublic, null, new[] { typeof(Type), typeof(bool), typeof(bool), typeof(bool) }, null);
static readonly Type TextContainerType
= Type.GetType("System.Windows.Documents.ITextContainer, PresentationFramework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35");
static readonly PropertyInfo TextContainerTextViewProp
= TextContainerType.GetProperty("TextView");
static readonly PropertyInfo TextContainerTextSelectionProp
= TextContainerType.GetProperty("TextSelection");
static readonly PropertyInfo TextContainerProp = typeof(TextBlock).GetProperty("TextContainer", BindingFlags.Instance | BindingFlags.NonPublic);
static void RegisterCommandHandlers(Type controlType, bool acceptsRichContent, bool readOnly, bool registerEventListeners)
{
RegisterMethod.Invoke(null, new object[] { controlType, acceptsRichContent, readOnly, registerEventListeners });
}
static SelectableTextBlock()
{
FocusableProperty.OverrideMetadata(typeof(SelectableTextBlock), new FrameworkPropertyMetadata(true));
RegisterCommandHandlers(typeof(SelectableTextBlock), true, true, true);
// remove the focus rectangle around the control
FocusVisualStyleProperty.OverrideMetadata(typeof(SelectableTextBlock), new FrameworkPropertyMetadata((object)null));
}
//private readonly TextEditorWrapper _editor;
object? textContainer;
object? editor;
public TextSelection TextSelection { get; private set; }
public SelectableTextBlock()
{
textContainer = TextContainerProp.GetValue(this);
editor = Activator.CreateInstance(TextEditorType, BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.CreateInstance,
null, new[] { textContainer, this, false }, null);
IsReadOnlyProp.SetValue(editor, true);
TextViewProp.SetValue(editor, TextContainerTextViewProp.GetValue(textContainer));
TextSelection = (TextSelection)TextContainerTextSelectionProp.GetValue(textContainer);
TextSelection.Changed += (s, e) => OnSelectionChanged?.Invoke(this, e);
}
public event EventHandler OnSelectionChanged;
}
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