如何在 CefSharp 中实现文本搜索
How to implement Text Search in CefSharp
我正在使用 CefSharp 构建一个应用程序,需要像 Google Chrome 那样向用户提供文本搜索功能。
谁能帮我在 CefSharp 中实现文本搜索?
我已经使用 CefSharp 47.0.3 构建了这个演示应用程序,希望这就是您要找的。
观点:
<Window x:Class="CefSharpSearchDemo.MainWindow"
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:wpf="clr-namespace:CefSharp.Wpf;assembly=CefSharp.Wpf"
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:cefSharpSearchDemo="clr-namespace:CefSharpSearchDemo"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525"
d:DataContext="{d:DesignInstance {x:Type cefSharpSearchDemo:MainWindowViewModel}}">
<DockPanel>
<DockPanel DockPanel.Dock="Top">
<Button Content="Next" DockPanel.Dock="Right" Command="{Binding ElementName=SearchBehavior, Path=NextCommand}" />
<Button Content="Previous" DockPanel.Dock="Right" Command="{Binding ElementName=SearchBehavior, Path=PreviousCommand}" />
<TextBox DockPanel.Dock="Right" Text="{Binding SearchText, UpdateSourceTrigger=PropertyChanged}"></TextBox>
</DockPanel>
<wpf:ChromiumWebBrowser x:Name="wb" DockPanel.Dock="Bottom"
Address="http://whosebug.com">
<i:Interaction.Behaviors>
<cefSharpSearchDemo:ChromiumWebBrowserSearchBehavior x:Name="SearchBehavior" SearchText="{Binding SearchText}" />
</i:Interaction.Behaviors>
</wpf:ChromiumWebBrowser>
</DockPanel>
</Window>
视图的代码隐藏:
namespace CefSharpSearchDemo
{
using System.Windows;
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
DataContext = new MainWindowViewModel();
}
}
}
视图模型:
namespace CefSharpSearchDemo
{
using System.ComponentModel;
using System.Runtime.CompilerServices;
public class MainWindowViewModel : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private string _searchText;
public string SearchText
{
get { return _searchText; }
set
{
_searchText = value;
NotifyPropertyChanged();
}
}
protected virtual void NotifyPropertyChanged([CallerMemberName] string propertyName = null)
{
var handler = PropertyChanged;
if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
}
}
}
现在是重要的部分。正如您在视图中看到的那样,ChromiumWebBrowser
:
附加了一个行为
namespace CefSharpSearchDemo
{
using System.Windows;
using System.Windows.Input;
using System.Windows.Interactivity;
using CefSharp;
using CefSharp.Wpf;
public class ChromiumWebBrowserSearchBehavior : Behavior<ChromiumWebBrowser>
{
private bool _isSearchEnabled;
public ChromiumWebBrowserSearchBehavior()
{
NextCommand = new DelegateCommand(OnNext);
PreviousCommand = new DelegateCommand(OnPrevious);
}
private void OnNext()
{
AssociatedObject.Find(identifier: 1, searchText: SearchText, forward: true, matchCase: false, findNext: true);
}
private void OnPrevious()
{
AssociatedObject.Find(identifier: 1, searchText: SearchText, forward: false, matchCase: false, findNext: true);
}
protected override void OnAttached()
{
AssociatedObject.FrameLoadEnd += ChromiumWebBrowserOnFrameLoadEnd;
}
private void ChromiumWebBrowserOnFrameLoadEnd(object sender, FrameLoadEndEventArgs frameLoadEndEventArgs)
{
_isSearchEnabled = frameLoadEndEventArgs.Frame.IsMain;
Dispatcher.Invoke(() =>
{
if (_isSearchEnabled && !string.IsNullOrEmpty(SearchText))
{
AssociatedObject.Find(1, SearchText, true, false, false);
}
});
}
public static readonly DependencyProperty SearchTextProperty = DependencyProperty.Register(
"SearchText", typeof(string), typeof(ChromiumWebBrowserSearchBehavior), new PropertyMetadata(default(string), OnSearchTextChanged));
public string SearchText
{
get { return (string)GetValue(SearchTextProperty); }
set { SetValue(SearchTextProperty, value); }
}
public static readonly DependencyProperty NextCommandProperty = DependencyProperty.Register(
"NextCommand", typeof (ICommand), typeof (ChromiumWebBrowserSearchBehavior), new PropertyMetadata(default(ICommand)));
public ICommand NextCommand
{
get { return (ICommand) GetValue(NextCommandProperty); }
set { SetValue(NextCommandProperty, value); }
}
public static readonly DependencyProperty PreviousCommandProperty = DependencyProperty.Register(
"PreviousCommand", typeof (ICommand), typeof (ChromiumWebBrowserSearchBehavior), new PropertyMetadata(default(ICommand)));
public ICommand PreviousCommand
{
get { return (ICommand) GetValue(PreviousCommandProperty); }
set { SetValue(PreviousCommandProperty, value); }
}
private static void OnSearchTextChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
var behavior = dependencyObject as ChromiumWebBrowserSearchBehavior;
if (behavior != null && behavior._isSearchEnabled)
{
var newSearchText = dependencyPropertyChangedEventArgs.NewValue as string;
if (string.IsNullOrEmpty(newSearchText))
{
behavior.AssociatedObject.StopFinding(true);
}
else
{
behavior.AssociatedObject.Find(1, newSearchText, true, false, false);
}
}
}
protected override void OnDetaching()
{
AssociatedObject.FrameLoadEnd -= ChromiumWebBrowserOnFrameLoadEnd;
}
}
}
以及 DelegateCommand
的次要附加代码:
namespace CefSharpSearchDemo
{
using System;
using System.Windows.Input;
public class DelegateCommand : ICommand
{
private readonly Action _action;
public DelegateCommand(Action action)
{
_action = action;
}
public bool CanExecute(object parameter)
{
return true;
}
public void Execute(object parameter)
{
_action();
}
public event EventHandler CanExecuteChanged;
}
}
生成的应用程序顶部有一个 TextBox
,旁边有两个标有 "Previous" 和 "Next" 的按钮。
主要区域是加载 http://www.whosebug.com.
的 CefSharp 浏览器
您可以输入 TextBox
,它将在浏览器中搜索(并突出显示命中所在的滚动条,就像在 Chrome 中一样)。然后,您可以按 Next/Previous 按钮循环点击。
我希望这有助于开发您自己的解决方案。
综上所述,请注意,下次如果您提出问题,请实际提供一些您尝试过的代码,或者尝试提出更具体的问题,因为这对于本网站而言可能过于宽泛。不管怎样,我把它留在这里,也许其他人也会觉得它有用。
重要教训:ChromiumWebBrowser
公开了一些方法,您可以使用它们来实现搜索功能(即:Find
和 StopFinding
)。
您可以很简单地在表单上添加两个 buttons
和一个 textbox
。
第一个 buttons
用于下一个结果,第二个 buttons
用于上一个结果,textbox
用于搜索文本提供程序。
在文本框的 KeyUp 事件中 运行 下面的代码
if (tosBrowserSearchTxt.Text.Length <= 0)
{
//this will clear all search result
webBrowserChromium.StopFinding(true);
}
else
{
webBrowserChromium.Find(0, tosBrowserSearchTxt.Text, true, false,false);
}
在下一步按钮上单击 运行 下面的代码
webBrowserChromium.Find(0, tosBrowserSearchTxt.Text, true, false, false);
在上一个按钮上单击 运行 下面的代码
webBrowserChromium.Find(0, tosBrowserSearchTxt.Text, false, false, false);
当用户在文本框中键入任何字符时,KeyUp 事件的代码将搜索该文本,通过使用下一个和上一个按钮,您可以从一个结果导航到另一个结果。
我正在使用 CefSharp 构建一个应用程序,需要像 Google Chrome 那样向用户提供文本搜索功能。
谁能帮我在 CefSharp 中实现文本搜索?
我已经使用 CefSharp 47.0.3 构建了这个演示应用程序,希望这就是您要找的。
观点:
<Window x:Class="CefSharpSearchDemo.MainWindow"
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:wpf="clr-namespace:CefSharp.Wpf;assembly=CefSharp.Wpf"
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:cefSharpSearchDemo="clr-namespace:CefSharpSearchDemo"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525"
d:DataContext="{d:DesignInstance {x:Type cefSharpSearchDemo:MainWindowViewModel}}">
<DockPanel>
<DockPanel DockPanel.Dock="Top">
<Button Content="Next" DockPanel.Dock="Right" Command="{Binding ElementName=SearchBehavior, Path=NextCommand}" />
<Button Content="Previous" DockPanel.Dock="Right" Command="{Binding ElementName=SearchBehavior, Path=PreviousCommand}" />
<TextBox DockPanel.Dock="Right" Text="{Binding SearchText, UpdateSourceTrigger=PropertyChanged}"></TextBox>
</DockPanel>
<wpf:ChromiumWebBrowser x:Name="wb" DockPanel.Dock="Bottom"
Address="http://whosebug.com">
<i:Interaction.Behaviors>
<cefSharpSearchDemo:ChromiumWebBrowserSearchBehavior x:Name="SearchBehavior" SearchText="{Binding SearchText}" />
</i:Interaction.Behaviors>
</wpf:ChromiumWebBrowser>
</DockPanel>
</Window>
视图的代码隐藏:
namespace CefSharpSearchDemo
{
using System.Windows;
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
DataContext = new MainWindowViewModel();
}
}
}
视图模型:
namespace CefSharpSearchDemo
{
using System.ComponentModel;
using System.Runtime.CompilerServices;
public class MainWindowViewModel : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private string _searchText;
public string SearchText
{
get { return _searchText; }
set
{
_searchText = value;
NotifyPropertyChanged();
}
}
protected virtual void NotifyPropertyChanged([CallerMemberName] string propertyName = null)
{
var handler = PropertyChanged;
if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
}
}
}
现在是重要的部分。正如您在视图中看到的那样,ChromiumWebBrowser
:
namespace CefSharpSearchDemo
{
using System.Windows;
using System.Windows.Input;
using System.Windows.Interactivity;
using CefSharp;
using CefSharp.Wpf;
public class ChromiumWebBrowserSearchBehavior : Behavior<ChromiumWebBrowser>
{
private bool _isSearchEnabled;
public ChromiumWebBrowserSearchBehavior()
{
NextCommand = new DelegateCommand(OnNext);
PreviousCommand = new DelegateCommand(OnPrevious);
}
private void OnNext()
{
AssociatedObject.Find(identifier: 1, searchText: SearchText, forward: true, matchCase: false, findNext: true);
}
private void OnPrevious()
{
AssociatedObject.Find(identifier: 1, searchText: SearchText, forward: false, matchCase: false, findNext: true);
}
protected override void OnAttached()
{
AssociatedObject.FrameLoadEnd += ChromiumWebBrowserOnFrameLoadEnd;
}
private void ChromiumWebBrowserOnFrameLoadEnd(object sender, FrameLoadEndEventArgs frameLoadEndEventArgs)
{
_isSearchEnabled = frameLoadEndEventArgs.Frame.IsMain;
Dispatcher.Invoke(() =>
{
if (_isSearchEnabled && !string.IsNullOrEmpty(SearchText))
{
AssociatedObject.Find(1, SearchText, true, false, false);
}
});
}
public static readonly DependencyProperty SearchTextProperty = DependencyProperty.Register(
"SearchText", typeof(string), typeof(ChromiumWebBrowserSearchBehavior), new PropertyMetadata(default(string), OnSearchTextChanged));
public string SearchText
{
get { return (string)GetValue(SearchTextProperty); }
set { SetValue(SearchTextProperty, value); }
}
public static readonly DependencyProperty NextCommandProperty = DependencyProperty.Register(
"NextCommand", typeof (ICommand), typeof (ChromiumWebBrowserSearchBehavior), new PropertyMetadata(default(ICommand)));
public ICommand NextCommand
{
get { return (ICommand) GetValue(NextCommandProperty); }
set { SetValue(NextCommandProperty, value); }
}
public static readonly DependencyProperty PreviousCommandProperty = DependencyProperty.Register(
"PreviousCommand", typeof (ICommand), typeof (ChromiumWebBrowserSearchBehavior), new PropertyMetadata(default(ICommand)));
public ICommand PreviousCommand
{
get { return (ICommand) GetValue(PreviousCommandProperty); }
set { SetValue(PreviousCommandProperty, value); }
}
private static void OnSearchTextChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
var behavior = dependencyObject as ChromiumWebBrowserSearchBehavior;
if (behavior != null && behavior._isSearchEnabled)
{
var newSearchText = dependencyPropertyChangedEventArgs.NewValue as string;
if (string.IsNullOrEmpty(newSearchText))
{
behavior.AssociatedObject.StopFinding(true);
}
else
{
behavior.AssociatedObject.Find(1, newSearchText, true, false, false);
}
}
}
protected override void OnDetaching()
{
AssociatedObject.FrameLoadEnd -= ChromiumWebBrowserOnFrameLoadEnd;
}
}
}
以及 DelegateCommand
的次要附加代码:
namespace CefSharpSearchDemo
{
using System;
using System.Windows.Input;
public class DelegateCommand : ICommand
{
private readonly Action _action;
public DelegateCommand(Action action)
{
_action = action;
}
public bool CanExecute(object parameter)
{
return true;
}
public void Execute(object parameter)
{
_action();
}
public event EventHandler CanExecuteChanged;
}
}
生成的应用程序顶部有一个 TextBox
,旁边有两个标有 "Previous" 和 "Next" 的按钮。
主要区域是加载 http://www.whosebug.com.
的 CefSharp 浏览器您可以输入 TextBox
,它将在浏览器中搜索(并突出显示命中所在的滚动条,就像在 Chrome 中一样)。然后,您可以按 Next/Previous 按钮循环点击。
我希望这有助于开发您自己的解决方案。
综上所述,请注意,下次如果您提出问题,请实际提供一些您尝试过的代码,或者尝试提出更具体的问题,因为这对于本网站而言可能过于宽泛。不管怎样,我把它留在这里,也许其他人也会觉得它有用。
重要教训:ChromiumWebBrowser
公开了一些方法,您可以使用它们来实现搜索功能(即:Find
和 StopFinding
)。
您可以很简单地在表单上添加两个 buttons
和一个 textbox
。
第一个 buttons
用于下一个结果,第二个 buttons
用于上一个结果,textbox
用于搜索文本提供程序。
在文本框的 KeyUp 事件中 运行 下面的代码
if (tosBrowserSearchTxt.Text.Length <= 0)
{
//this will clear all search result
webBrowserChromium.StopFinding(true);
}
else
{
webBrowserChromium.Find(0, tosBrowserSearchTxt.Text, true, false,false);
}
在下一步按钮上单击 运行 下面的代码
webBrowserChromium.Find(0, tosBrowserSearchTxt.Text, true, false, false);
在上一个按钮上单击 运行 下面的代码
webBrowserChromium.Find(0, tosBrowserSearchTxt.Text, false, false, false);
当用户在文本框中键入任何字符时,KeyUp 事件的代码将搜索该文本,通过使用下一个和上一个按钮,您可以从一个结果导航到另一个结果。