如何设置RichTextBox字体的下一个文字被写入？ [英] How to set RichTextBox Font for the next text to be written?
问题描述
我需要为下一个要写入RichTextBox的文本设置字体系列。 ...
$ b pre $ < RichTextBox x：Name =RichTextEditorMaxWidth =1000
FontFamily ={Binding ElementName = TextFontComboBox，Path = SelectedItem}
FontSize ={Binding ElementName = TextSizeComboBox，Path = SelectedValue}
Width = AutoHeight =AutoHorizontalScrollBarVisibility =Auto
VerticalScrollBarVisibility =Auto/>
...但它改变了整个文本。我想通过选择属性，我可以限制更改只适用于选定的区域。但是如何为下一个-not尚未输入文本？
为了设置基于光标位置的FontFamily，你需要使用依赖项属性定义一个自定义控件，通过重写OnTextInput方法来帮助插入一个新的Run部分。
我包括了大部分的代码，你需要修改命名空间，以适应您的开发环境。
代码使用ViewModel来管理可用的字体，并管理字体是否改变。
这段代码只是一个原型，并不涉及两个控件之间的聚焦问题。
使用这段代码：
1 - 在RichTectBox中键入一些文本。
2-在ComboBox中更改字体。
3-返回到RichTextBox。
4-键入some更多的文字。
这是自定义的RichTextBox控件：使用System.Windows的
;
使用System.Windows.Controls;
使用System.Windows.Documents;
使用System.Windows.Input;
使用System.Windows.Media;
namespace RichTextboxFont.Views
{
public class RichTextBoxCustom：RichTextBox
{
public static readonly DependencyProperty CurrentFontFamilyProperty =
DependencyProperty.Register（ CurrentFontFamily，
typeof（FontFamily），typeof
（RichTextBoxCustom），
新的FrameworkPropertyMetadata（新的FontFamily（Tahoma），
FrameworkPropertyMetadataOptions.BindsTwoWayByDefault，
PropertyChangedCallback （OnCurrentFontChanged）））;
$ b $ public FontFamily CurrentFontFamily
{
get
{
return（FontFamily）GetValue（CurrentFontFamilyProperty）;
}
set
{
SetValue（CurrentFontFamilyProperty，value）;
$ b $ private void OnCurrentFontChanged（DependencyObject o，DependencyPropertyChangedEventArgs e）
{}
protected override OnTextInput（TextCompositionEventArgs e ）
{
ViewModels.MainViewModel mwvm = this.DataContext as ViewModels.MainViewModel;
if（（mwvm！= null）&&（mwvm.FontChanged））
{
TextPointer textPointer = this.CaretPosition.GetInsertionPosition（LogicalDirection.Forward）;
Run run = new Run（e.Text，textPointer）;
run.FontFamily = this.CurrentFontFamily;
this.CaretPosition = run.ElementEnd;
mwvm.FontChanged = false;
}
else
{
base.OnTextInput（e）;
$ b code
$ b是XAML：
< Window x：Class =RichTextboxFont.Views.MainView
xmlns =http ：//schemas.microsoft.com/winfx/2006/xaml/presentation
xmlns：x =http://schemas.microsoft.com/winfx/2006/xaml
xmlns：local = clr-namespace：RichTextboxFont.Views
xmlns：ViewModels =clr-namespace：RichTextboxFont.ViewModels
Title =Main Window
Height =400Width =800 >
< DockPanel>
<网格>
< Grid.RowDefinitions>
< RowDefinition Height =Auto/>
< RowDefinition />
< /Grid.RowDefinitions>
< ComboBox ItemsSource ={Binding Path = Fonts}
SelectedItem ={Binding Path = SelectedFont，Mode = TwoWay}/>
< local：RichTextBoxCustom Grid.Row =1
CurrentFontFamily ={Binding Path = SelectedFont，Mode = TwoWay}
FontSize =30/>
< / Grid>
< / DockPanel>
< / Window>
以下是ViewModel：
如果您不使用视图模型，请告诉我我也将添加基类代码;否则，google / stackoverflow也可以帮助你。
using System.Collections.ObjectModel;
使用System.Windows.Media;
namespace RichTextboxFont.ViewModels
{
public class MainViewModel：ViewModelBase
{
#region构造函数
public MainViewModel（）
{
FontFamily f1 = new FontFamily（Georgia）;
_fonts.Add（f1）;
FontFamily f2 = new FontFamily（Tahoma）;
_fonts.Add（f2）;
}
Private ObservableCollection< FontFamily> _fonts = new ObservableCollection< FontFamily>（）;
public ObservableCollection< FontFamily>字体
{
获得
{
return _fonts;
}
set
{
_fonts = value;
OnPropertyChanged（Fonts）;
$ b $ private FontFamily _selectedFont = new FontFamily（Tahoma）;
public FontFamily SelectedFont
{
get
{
return _selectedFont;
}
set
{
_selectedFont = value;
FontChanged = true;
OnPropertyChanged（SelectedFont）;
}
}
private bool _fontChanged = false;
public bool FontChanged
{
get
{
return _fontChanged;
}
set
{
_fontChanged = value;
OnPropertyChanged（FontChanged）;
$ b #endregion
code $ pre
这里是Window代码隐藏的地方，我使用System.Windows来初始化ViewModel：
;
命名空间RichTextboxFont.Views
{
public partial class MainView：Window
{
public MainView（）
{
InitializeComponent （）;
this.DataContext = new ViewModels.MainViewModel（）;
}
}
}
I need to set the font family for the next text to be written in a RichTextBox.
I tried setting that with...
<RichTextBox x:Name="RichTextEditor" MaxWidth="1000" SpellCheck.IsEnabled="True"
FontFamily="{Binding ElementName=TextFontComboBox, Path=SelectedItem}"
FontSize="{Binding ElementName=TextSizeComboBox, Path=SelectedValue}"
Width="Auto" Height="Auto" HorizontalScrollBarVisibility="Auto"
VerticalScrollBarVisibility="Auto" />
...but it changed the whole text. I suppose that with the Selection property I can restrict the change to be applied just to the selected area. But how for the next -not yet typed- text?
解决方案 In order to set the FontFamily based on the cursor position you need to define a custom control with a dependency property that helps insert a new Run section by overriding the OnTextInput method.
I included most of the code, you'll need to modify the namespaces to fit your development environment.
The code uses a ViewModel to manage the available fonts and manage if the font changed.
This code is only a prototype and does not deal with focusing issues between the two controls.
To use this code:
1- Type some text in the RichTectBox.
2- Change the font in the ComboBox.
3- Tab back to the RichTextBox.
4- Type some more text.
Here is the custom RichTextBox control:
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
namespace RichTextboxFont.Views
{
public class RichTextBoxCustom : RichTextBox
{
public static readonly DependencyProperty CurrentFontFamilyProperty =
DependencyProperty.Register("CurrentFontFamily",
typeof(FontFamily), typeof
(RichTextBoxCustom),
new FrameworkPropertyMetadata(new FontFamily("Tahoma"),
FrameworkPropertyMetadataOptions.BindsTwoWayByDefault,
new PropertyChangedCallback(OnCurrentFontChanged)));
public FontFamily CurrentFontFamily
{
get
{
return (FontFamily)GetValue(CurrentFontFamilyProperty);
}
set
{
SetValue(CurrentFontFamilyProperty, value);
}
}
private static void OnCurrentFontChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{}
protected override void OnTextInput(TextCompositionEventArgs e)
{
ViewModels.MainViewModel mwvm = this.DataContext as ViewModels.MainViewModel;
if ((mwvm != null) && (mwvm.FontChanged))
{
TextPointer textPointer = this.CaretPosition.GetInsertionPosition(LogicalDirection.Forward);
Run run = new Run(e.Text, textPointer);
run.FontFamily = this.CurrentFontFamily;
this.CaretPosition = run.ElementEnd;
mwvm.FontChanged = false;
}
else
{
base.OnTextInput(e);
}
}
}
}
Here is the XAML:
<Window x:Class="RichTextboxFont.Views.MainView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:RichTextboxFont.Views"
xmlns:ViewModels="clr-namespace:RichTextboxFont.ViewModels"
Title="Main Window"
Height="400" Width="800">
<DockPanel>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition/>
</Grid.RowDefinitions>
<ComboBox ItemsSource="{Binding Path=Fonts}"
SelectedItem="{Binding Path=SelectedFont, Mode=TwoWay}"/>
<local:RichTextBoxCustom Grid.Row="1"
CurrentFontFamily="{Binding Path=SelectedFont, Mode=TwoWay}"
FontSize="30"/>
</Grid>
</DockPanel>
</Window>
Here is the ViewModel:
If you do not use view models, let me know and I'll add the base class code too; otherwise, google/stackoverflow can help you too.
using System.Collections.ObjectModel;
using System.Windows.Media;
namespace RichTextboxFont.ViewModels
{
public class MainViewModel : ViewModelBase
{
#region Constructor
public MainViewModel()
{
FontFamily f1 = new FontFamily("Georgia");
_fonts.Add(f1);
FontFamily f2 = new FontFamily("Tahoma");
_fonts.Add(f2);
}
private ObservableCollection<FontFamily> _fonts = new ObservableCollection<FontFamily>();
public ObservableCollection<FontFamily> Fonts
{
get
{
return _fonts;
}
set
{
_fonts = value;
OnPropertyChanged("Fonts");
}
}
private FontFamily _selectedFont = new FontFamily("Tahoma");
public FontFamily SelectedFont
{
get
{
return _selectedFont;
}
set
{
_selectedFont = value;
FontChanged = true;
OnPropertyChanged("SelectedFont");
}
}
private bool _fontChanged = false;
public bool FontChanged
{
get
{
return _fontChanged;
}
set
{
_fontChanged = value;
OnPropertyChanged("FontChanged");
}
}
#endregion
}
}
Here is the Window code-behind where I initialise the ViewModel:
using System.Windows;
namespace RichTextboxFont.Views
{
public partial class MainView : Window
{
public MainView()
{
InitializeComponent();
this.DataContext = new ViewModels.MainViewModel();
}
}
}
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