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WPF 实现 RichTextBox 关键字查询高亮
2022-07-20 14:29:00 【太阳风暴】
导言：我想实现一个简单的载入RTF文件到RichTextBox 中并可以查找关键字，并高亮关键字，提供上一个关键字与下一个关键字之间相互切换的效果，目前还有些小问题，就是RichTextBox 窗口导航到关键字的位置有些问题。
- 建议先看 演示结果 再看看是不是你需要的
一、环境说明
- 系统：Windows 10.0.19044 家庭版
- 工具：Visual Stdio 2019 community
- .Net：.Net FrameWork 4.6.2
- 类型：WPF桌面应用
二、代码
1、前端代码
<Window x:Class="xx_MSS.Pages.IntroductionWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local="clr-namespace:xx_MSS.Pages" mc:Ignorable="d" FontSize="18" Title="测试测试" Height="680" Width="1028">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="60"/>
<RowDefinition/>
</Grid.RowDefinitions>
<Grid Grid.Row="0">
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition/>
<ColumnDefinition Width="40"/>
</Grid.ColumnDefinitions>
<StackPanel Orientation="Horizontal" Grid.Column="0">
<Label Content="质谱仪：" FontWeight="Bold" VerticalAlignment="Top" Margin="40, 10, 0,0" />
<ComboBox Grid.Row="2" x:Name="m_combox" Width="150" Height="30" VerticalAlignment="Top" Margin="0, 10" SelectionChanged="upDateDoucument">
<ComboBoxItem Content="质谱仪器1" IsSelected="True"/>
<ComboBoxItem Content="质谱仪器2"/>
</ComboBox>
</StackPanel>
<StackPanel Orientation="Horizontal" Grid.Column="1">
<Label Content="搜索：" FontWeight="Bold" VerticalAlignment="Top" Margin="10, 10, 0,0" />
<TextBox x:Name="m_SearchTextBox" Width="300" Height="30" VerticalAlignment="Top" Margin="0, 10" KeyUp="excetueSearch"/>
<Button x:Name="m_SearchBefore" Click="searchAfterBeforeBtnClicked" Height="30" Content="《" Width="40" Margin="0,10,0,20"/>
<Button x:Name="m_SearchAfter" Click="searchAfterBeforeBtnClicked" Height="30" Margin="0,10,0,20" Content="》" Width="40"/>
</StackPanel>
</Grid>
<RichTextBox x:Name="m_richText" Grid.Row="1" BorderThickness="0" Margin="60, 10, 60, 5" />
</Grid>
</Window>
2、后端代码
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Diagnostics;
namespace xx_MSS.Pages
{
public class CommonColorsHelp
{
public static Color KeyFontColor = Color.FromRgb(0, 0, 0);
public static Color DefaultFontColor = Color.FromRgb(0, 0, 0);
public static Color SelectedKeyBackGroundColor = Color.FromRgb(234, 167, 255);
public static Color SelectedKeyFontColor = Color.FromRgb(0, 0, 0);
public static Color DefaultBackGroundColor = Color.FromRgb(255, 255, 255);
}
/// <summary>
/// Introduction.xaml 的交互逻辑
/// </summary>
public partial class IntroductionWindow : Window
{
private Dictionary<string, string> m_mapBooksPairs;
public IntroductionWindow()
{
InitializeComponent();
m_richText.IsReadOnly = true;
//绑定页面而已，在根路径下放置几个rtf文件即可
m_mapBooksPairs = new Dictionary<string, string>();
m_mapBooksPairs.Add("质谱仪器1", "./Documents/one.rtf");
m_mapBooksPairs.Add("质谱仪器2", "./Documents/two.rtf");
loadFile(m_combox.Text, m_richText);
}
/// <summary>
/// 加载文件
/// </summary>
/// <param name="filename"></param>
/// <param name="richTextBox"></param>
private void loadFile(string filename, RichTextBox richTextBox)
{
filename = m_mapBooksPairs[filename];
if (string.IsNullOrEmpty(filename))
{
throw new ArgumentNullException();
}
if (!File.Exists(filename))
{
throw new FileNotFoundException();
}
using (FileStream stream = File.OpenRead(filename))
{
TextRange documentTextRange = new TextRange(richTextBox.Document.ContentStart, richTextBox.Document.ContentEnd);
string dataFormat = DataFormats.Text;
string ext = System.IO.Path.GetExtension(filename);
if (String.Compare(ext, ".xaml", true) == 0)
{
dataFormat = DataFormats.Xaml;
}
else if (String.Compare(ext, ".rtf", true) == 0)
{
dataFormat = DataFormats.Rtf;
}
documentTextRange.Load(stream, dataFormat);
}
}
private void upDateDoucument(object sender, SelectionChangedEventArgs e)
{
ComboBox comboBox = (ComboBox)sender;
var name = comboBox.SelectedItem.ToString().Split(':')[1].Trim();
if(m_mapBooksPairs != null)
{
loadFile(name, m_richText);
}
}
private void excetueSearch(object sender, KeyEventArgs e)
{
if(e.Key == Key.Enter)
{
string searchKey = m_SearchTextBox.Text.Trim();
if (searchKey != "")
{
ChangeSeachKeyWordsColor(searchKey);
}
else
{
ReSetBackGroundAll();
}
}
}
/// <summary>
/// 改变在文章中用户搜索的关键字的字体颜色
/// </summary>
/// <param name="keyword"></param>
public void ChangeSeachKeyWordsColor(string keyword)
{
ChangeColorWithResout(keyword);
}
/// <summary>
/// 改变关键字的字体颜色
/// </summary>
/// <param name="keyword">用户搜索关键字</param>
/// <returns></returns>
private List<TextRange> ChangeColorWithResout(string keyword)
{
if (!string.IsNullOrEmpty(m_ProSearchkey))
{
ChangeColor(CommonColorsHelp.DefaultFontColor, m_ProSearchkey);
ReSetBackGroundAll();
}
m_ProSearchkey = keyword;
return ChangeColor(CommonColorsHelp.KeyFontColor, keyword);
}
/// <summary>
/// 设置背景色
/// </summary>
/// <param name="l"></param>
/// <param name="textRange"></param>
public void SetBackGround(Color l, TextRange textRange)
{
textRange.ApplyPropertyValue(TextElement.BackgroundProperty, new SolidColorBrush(l));
textRange.ApplyPropertyValue(TextElement.ForegroundProperty, new SolidColorBrush(CommonColorsHelp.SelectedKeyFontColor));
}
/// <summary>
/// 重新设置背景色
/// </summary>
/// <param name="textRange">关键字的的TextRange</param>
/// <param name="isCurrKeyWord">是否是当前的关键字</param>
public void ReSetBackGround(TextRange textRange, bool isCurrKeyWord)
{
textRange.ApplyPropertyValue(TextElement.BackgroundProperty, new SolidColorBrush(CommonColorsHelp.DefaultBackGroundColor));
if (isCurrKeyWord)
{
textRange.ApplyPropertyValue(TextElement.ForegroundProperty, new SolidColorBrush(CommonColorsHelp.KeyFontColor));
}
else
{
textRange.ApplyPropertyValue(TextElement.ForegroundProperty, new SolidColorBrush(CommonColorsHelp.DefaultFontColor));
}
}
/// <summary>
/// 上一处
/// </summary>
public void SetUpBackGround()
{
if (m_TextList != null && m_TextList.Count > 0)
{
//Rect r = m_TextList[currNumber].Start.GetCharacterRect(LogicalDirection.Backward);
//m_richText.ScrollToVerticalOffset(r.Y);
//FrameworkContentElement e = m_TextList[currNumber].Start.Parent as FrameworkContentElement;
//if (e != null)
// e.BringIntoView();
///滚动到指定位置
var characterRect = m_TextList[currNumber].Start.GetCharacterRect(LogicalDirection.Forward);
m_richText.ScrollToVerticalOffset(m_richText.VerticalOffset + characterRect.Top - m_richText.ActualHeight / 2d);
ReSetBackGround(m_TextList[currNumber], true);
currNumber--;
if (currNumber < 0)
{
currNumber = m_TextList.Count - 1;
}
SetBackGround(CommonColorsHelp.SelectedKeyBackGroundColor, m_TextList[currNumber]);
}
}
/// <summary>
/// 下一处
/// </summary>
public void SetDownBackGround()
{
if (m_TextList != null && m_TextList.Count > 0)
{
//Rect r = m_TextList[currNumber].Start.GetCharacterRect(LogicalDirection.Backward);
//m_richText.ScrollToVerticalOffset(r.Y);
//FrameworkContentElement e = m_TextList[currNumber].Start.Parent as FrameworkContentElement;
//if (e != null)
// e.BringIntoView();
var characterRect = m_TextList[currNumber].Start.GetCharacterRect(LogicalDirection.Forward);
m_richText.ScrollToVerticalOffset(m_richText.VerticalOffset + characterRect.Top - m_richText.ActualHeight / 2d);
ReSetBackGround(m_TextList[currNumber], true);
currNumber++;
if (currNumber >= m_TextList.Count)
{
currNumber = 0;
}
SetBackGround(CommonColorsHelp.SelectedKeyBackGroundColor, m_TextList[currNumber]);
}
}
/// <summary>
/// 改变关键字的具体实现
/// </summary>
/// <param name="l"></param>
/// <param name="richTextBox1"></param>
/// <param name="selectLength"></param>
/// <param name="tpStart"></param>
/// <param name="tpEnd"></param>
/// <returns></returns>
private TextPointer selecta(Color l, RichTextBox richTextBox1, int selectLength, TextPointer tpStart, TextPointer tpEnd)
{
TextRange range = richTextBox1.Selection;
range.Select(tpStart, tpEnd);
//高亮选择
range.ApplyPropertyValue(TextElement.ForegroundProperty, new SolidColorBrush(l));
return tpEnd.GetNextContextPosition(LogicalDirection.Forward);
}
/// <summary>
/// 把所有背景恢复到默认
/// </summary>
private void ReSetBackGroundAll()
{
if (m_TextList != null)
{
foreach (TextRange textRange in m_TextList)
{
ReSetBackGround(textRange, false);
}
}
}
/// <summary>
/// 当前第几处关键字被选中
/// </summary>
private int currNumber = 0;
/// <summary>
/// 改变关键字字体颜色
/// </summary>
/// <param name="l">颜色</param>
/// <param name="keyword">关键字</param>
/// <returns></returns>
private List<TextRange> ChangeColor(Color l, string keyword)
{
m_TextList = new List<TextRange>();
//设置文字指针为Document初始位置
//richBox.Document.FlowDirection
TextPointer position = m_richText.Document.ContentStart;
while (position != null)
{
//向前搜索,需要内容为Text
if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
{
//拿出Run的Text
string text = position.GetTextInRun(LogicalDirection.Forward);
//可能包含多个keyword,做遍历查找
int index = 0;
index = text.IndexOf(keyword, 0);
if (index != -1)
{
TextPointer start = position.GetPositionAtOffset(index);
TextPointer end = start.GetPositionAtOffset(keyword.Length);
m_TextList.Add(new TextRange(start, end));
position = selecta(l, m_richText, keyword.Length, start, end);
}
}
//文字指针向前偏移
position = position.GetNextContextPosition(LogicalDirection.Forward);
}
if (m_TextList != null && m_TextList.Count > 0)
{
//重置
currNumber = 0;
SetBackGround(CommonColorsHelp.SelectedKeyBackGroundColor, m_TextList[currNumber]);
}
return m_TextList;
}
/// <summary>
/// 当前关键字共搜索出的结果集合
/// </summary>
private List<TextRange> m_TextList;
private string m_ProSearchkey;
private void searchAfterBeforeBtnClicked(object sender, RoutedEventArgs e)
{
Button button = (Button)sender;
switch(button.Name)
{
case "m_SearchBefore":
SetUpBackGround();
break;
case "m_SearchAfter":
SetDownBackGround();
break;
}
}
}
}
三、演示结果
四、参考资料
WPF搜索关键字：https://www.cnblogs.com/shanranlei/p/3635317.html
RichTextBox滚动到关键字位置：https://stackoverflow.com/questions/6908983/wpf-richtextbox-scroll-to-textpointer
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