[英]How to implement Text Search in cefSharp
我正在使用cefSharp
构建和应用程序。 现在我需要像Google Chrome
一样为用户提供文本搜索功能。 任何人都可以帮助我在cefSharp
实现文本搜索。
您只需在表单上添加两个buttons
和一个textbox
。 下一个结果的第一个buttons
,上一个结果的第二个buttons
和搜索文本提供者的textbox
。
if (tosBrowserSearchTxt.Text.Length <= 0)
{
//this will clear all search result
webBrowserChromium.StopFinding(true);
}
else
{
webBrowserChromium.Find(0, tosBrowserSearchTxt.Text, true, false,false);
}
webBrowserChromium.Find(0, tosBrowserSearchTxt.Text, true, false, false);
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。
我使用CefSharp 47.0.3构建了这个演示应用程序,希望这正是您所需要的。
风景:
<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://stackoverflow.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));
}
}
}
而现在是重要的一部分。 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;
}
}
}
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
,旁边标有“Previous”和“Next”的两个按钮。
主要区域是加载http://www.stackoverflow.com的CefSharp浏览器。
您可以输入TextBox
,它将在浏览器中搜索(并突出显示点击的滚动条,就像在Chrome中一样)。 然后,您可以按“下一个/上一个”按钮循环点击。
我希望这有助于开发自己的解决方案。
所有这些都说,让我注意下次如果你问一个问题,实际上提供了一些你尝试过的代码,或者尝试提出一个更具体的问题,因为这对于这个网站来说可能太宽泛了。 无论如何,我把它留在这里,也许其他人会发现它也很有用。
重要的一课: ChromiumWebBrowser
上有一些可用于实现搜索功能的方法(即: Find
和StopFinding
)。
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