wpf有像浏览器那样全局搜索定位的功能？

hello 20

wpf有像浏览器那样全局搜索定位高亮文本的功能？

又比如点下一个，会定位下一个匹配文本，点上一个反之亦然。

如果有网格，包括定位网格内的内容定位。

Hui Liu-MSFT 48,596 Microsoft 供应商

你好,@hello. 想要实现这个功能有很多方式。我做了一个示例，先分享在这里。但是它当前还有些问题，如果我完善好功能的话会在下面继续更新。如果你可以完善它，也请在这里分享代码。

<Window x:Class="WpfApp2.PopWindow"
       ...
        mc:Ignorable="d"
        Title="PopWindow" Height="80" Width="500">
    <StackPanel Orientation="Horizontal">
        <TextBox x:Name="SearchBox" Text="{Binding SearchTerm,UpdateSourceTrigger=PropertyChanged}" Width="200" Margin="5" TextChanged="SearchBox_TextChanged" />
        <Button x:Name="PrevButton" Content="Previous" Width="75" Margin="5" Click="PrevButton_Click"/>
        <Button x:Name="NextButton" Content="Next" Width="75" Margin="5" Click="NextButton_Click"/>
    </StackPanel>
   
</Window>

PopWindow


  public partial class PopWindow : Window, INotifyPropertyChanged
  {
      public event EventHandler<string> SearchTermChanged;
      public event EventHandler NavigatePrevious;
      public event EventHandler NavigateNext;
      public PopWindow()
      {
          InitializeComponent();
          DataContext = this;
      }
      private string _searchTerm;

      public string SearchTerm
      {
          get { return _searchTerm; }
          set
          {
              if (_searchTerm != value)
              {
                  _searchTerm = value;
                  OnPropertyChanged(nameof(SearchTerm));
                  //  OnSearchTermChanged();
              }
          }
      }
    

      private void PrevButton_Click(object sender, RoutedEventArgs e)
      {
          NavigatePrevious?.Invoke(this, EventArgs.Empty);
      }

      private void NextButton_Click(object sender, RoutedEventArgs e)
      {
          NavigateNext?.Invoke(this, EventArgs.Empty);
      }

      public event PropertyChangedEventHandler PropertyChanged;

      protected virtual void OnPropertyChanged(string propertyName)
      {
          PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
      }

      private void SearchBox_TextChanged(object sender, TextChangedEventArgs e)
      {
          SearchTermChanged?.Invoke(this, SearchTerm);

      }
  }


<Window x:Class="WpfApp2.MainWindow"

      ...

        mc:Ignorable="d"

        Title="MainWindow" Height="450" Width="800">

    <StackPanel Name="MainGrid">

        <RichTextBox x:Name="RichTextBox" VerticalAlignment="Top" Height="150">

            <FlowDocument>

                <Paragraph>

                    This is some example text in the RichTextBox. It can be used for testing the search functionality.

                </Paragraph>

                <Paragraph>

                    Another paragraph of example text to ensure the search and highlight feature works correctly.

                </Paragraph>

            </FlowDocument>

        </RichTextBox>

        <DataGrid x:Name="DataGrid" AutoGenerateColumns="False" VerticalAlignment="Top" Height="250">

            <DataGrid.Columns>

            <DataGridTextColumn Header="ID" Binding="{Binding ID}" />

            <DataGridTextColumn Header="Name" Binding="{Binding Name}" />

            <DataGridTextColumn Header="Description" Binding="{Binding Description}" />

            </DataGrid.Columns>

        </DataGrid>

    </StackPanel>

</Window>

MainWindow


    public partial class MainWindow : Window
    {
        private PopWindow _searchPopup;
        private List<MatchLocation> _matches;
        private int _currentMatchIndex;

        public MainWindow()
        {
            InitializeComponent();
            DataGrid.ItemsSource = new List<Item>
            {
                new Item { ID = 1, Name = "Item 1", Description = "This is the first item." },
                new Item { ID = 2, Name = "Item 2", Description = "This is the second item." },
                new Item { ID = 3, Name = "Item 3", Description = "This is the third item." }
            };
            this.PreviewKeyDown += new KeyEventHandler(MainWindow_PreviewKeyDown);
        }
       

        private void MainWindow_PreviewKeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.F && (Keyboard.Modifiers & ModifierKeys.Control) == ModifierKeys.Control)
            {
                _searchPopup = new PopWindow();
                _searchPopup.SearchTermChanged += OnSearchTermChanged;
                _searchPopup.NavigatePrevious += OnNavigatePrevious;
                _searchPopup.NavigateNext += OnNavigateNext;
                _searchPopup.Owner = this;

                _searchPopup.Show();
                _searchPopup.SearchBox.Focus();
            }


        }

        private void OnSearchTermChanged(object sender, string searchTerm)

        {
            _matches = FindMatches(searchTerm);
            _currentMatchIndex = -1;

            if (_matches.Any())
            {


                for (int i = 0; i < _matches.Count - 1; i++)
                {
                    
                    NavigateToMatch(_matches[i], Brushes.Yellow);
                }

                NavigateToNextMatch();
                NavigateToMatch(_matches[_currentMatchIndex], Brushes.Orange);
            }


        }

        private void OnNavigatePrevious(object sender, EventArgs e)
        {
            if (_matches.Any() && _currentMatchIndex > 0)
            {
                NavigateToMatch(_matches[_currentMatchIndex], Brushes.Yellow);
                _currentMatchIndex--;
                NavigateToMatch(_matches[_currentMatchIndex], Brushes.Orange);
            }
        }

        private void OnNavigateNext(object sender, EventArgs e)
        {
            if (_matches.Any() && _currentMatchIndex < _matches.Count - 1)
            {
                NavigateToMatch(_matches[_currentMatchIndex], Brushes.Yellow);
                _currentMatchIndex++;
                NavigateToMatch(_matches[_currentMatchIndex], Brushes.Orange);
            }
        }

        private List<MatchLocation> FindMatches(string searchTerm)
        {
            var matches = new List<MatchLocation>();

            foreach (var control in FindVisualChildren<TextBlock>(this))
            {
                matches.AddRange(FindMatchesInTextBlock(control, searchTerm));
            }

            foreach (var control in FindVisualChildren<TextBox>(this))
            {
                matches.AddRange(FindMatchesInTextBox(control, searchTerm));
            }

            return matches;
        }

        private List<MatchLocation> FindMatchesInTextBlock(TextBlock textBlock, string searchTerm)
        {
            var matches = new List<MatchLocation>();
            var regex = new Regex(Regex.Escape(searchTerm), RegexOptions.IgnoreCase);
            foreach (Match match in regex.Matches(textBlock.Text))
            {
                matches.Add(new MatchLocation
                {
                    Control = textBlock,
                    Match = match
                });
            }
            return matches;
        }

        private List<MatchLocation> FindMatchesInTextBox(TextBox textBox, string searchTerm)
        {
            var matches = new List<MatchLocation>();
            var regex = new Regex(Regex.Escape(searchTerm), RegexOptions.IgnoreCase);
            foreach (Match match in regex.Matches(textBox.Text))
            {
                matches.Add(new MatchLocation
                {
                    Control = textBox,
                    Match = match
                });
            }
            return matches;
        }

        private void NavigateToMatch(MatchLocation matchLocation, Brush highlightColor)
        {
            if (matchLocation.Control is TextBlock textBlock)
            {
                HighlightTextBlockMatch(textBlock, matchLocation.Match, highlightColor);
                textBlock.BringIntoView();
            }
            else if (matchLocation.Control is TextBox textBox)
            {
                HighlightTextBoxMatch(textBox, matchLocation.Match, highlightColor);
                textBox.Focus();
                textBox.CaretIndex = matchLocation.Match.Index;
                textBox.ScrollToLine(textBox.GetLineIndexFromCharacterIndex(matchLocation.Match.Index));
            }
        }

        private void HighlightTextBlockMatch(TextBlock textBlock, Match match, Brush highlightColor)
        {
            var text = textBlock.Text;
            textBlock.Inlines.Clear();

            var startIndex = 0;
            foreach (Match m in Regex.Matches(text, Regex.Escape(match.Value), RegexOptions.IgnoreCase))
            {
                if (m.Index > startIndex)
                {
                    textBlock.Inlines.Add(new Run(text.Substring(startIndex, m.Index - startIndex)));
                }

                var run = new Run(m.Value)
                {
                    Background = highlightColor
                };
                textBlock.Inlines.Add(run);

                startIndex = m.Index + m.Length;
            }

            if (startIndex < text.Length)
            {
                textBlock.Inlines.Add(new Run(text.Substring(startIndex)));
            }
        }

        private void HighlightTextBoxMatch(TextBox textBox, Match match, Brush highlightColor)
        {
            var startIndex = textBox.Text.IndexOf(match.Value, StringComparison.CurrentCultureIgnoreCase);
            if (startIndex >= 0)
            {
                textBox.Select(startIndex, match.Length);
                textBox.SelectionBrush = highlightColor;
            }
        }

        private void NavigateToNextMatch()
        {
            if (_matches.Any() && _currentMatchIndex < _matches.Count - 1)
            {
                _currentMatchIndex++;
                NavigateToMatch(_matches[_currentMatchIndex], Brushes.Yellow);
            }
        }

        public static IEnumerable<T> FindVisualChildren<T>(DependencyObject depObj) where T : DependencyObject
        {
            if (depObj != null)
            {
                for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
                {
                    DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
                    if (child != null && child is T)
                    {
                        yield return (T)child;
                    }

                    foreach (T childOfChild in FindVisualChildren<T>(child))
                    {
                        yield return childOfChild;
                    }
                }
            }
        }

        private class MatchLocation
        {
            public UIElement Control { get; set; }
            public Match Match { get; set; }
        }

        public class Item
        {
            public int ID { get; set; }
            public string Name { get; set; }
            public string Description { get; set; }
        }
    }

1 个答案

Jie Bao 0 信誉分

2024-09-18T14:54:26.26+00:00

还有一个思路，利用TextBlock 的文本内容呈现可以实现动态局部文本渲染，论坛里面有个帖子，你可以看看 https://learn.microsoft.com/en-us/answers/questions/401884/how-to-highlight-text-in-the-textblock-with-inline
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wpf有像浏览器那样全局搜索定位的功能？

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