[英]How to implement Text Search in cefSharp
我正在使用cefSharp
構建和應用程序。 現在我需要像Google Chrome
一樣為用戶提供文本搜索功能。 任何人都可以幫助我在cefSharp
實現文本搜索。
您只需在表單上添加兩個buttons
和一個textbox
。 下一個結果的第一個buttons
,上一個結果的第二個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);
當用戶在文本框中鍵入任何字符時,KeyUp事件的代碼將搜索該文本,通過使用下一個和上一個按鈕,您可以從一個結果導航到另一個結果。
我使用CefSharp 47.0.3構建了這個演示應用程序,希望這正是您所需要的。
風景:
<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>
視圖的代碼隱藏:
namespace CefSharpSearchDemo
{
using System.Windows;
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
DataContext = new MainWindowViewModel();
}
}
}
視圖模型:
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));
}
}
}
而現在是重要的一部分。 正如您在視圖中看到的那樣, ChromiumWebBrowser
附加了一個行為:
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
的次要附加代碼:
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;
}
}
生成的應用程序頂部有一個TextBox
,旁邊標有“Previous”和“Next”的兩個按鈕。
主要區域是加載http://www.stackoverflow.com的CefSharp瀏覽器。
您可以輸入TextBox
,它將在瀏覽器中搜索(並突出顯示點擊的滾動條,就像在Chrome中一樣)。 然后,您可以按“下一個/上一個”按鈕循環點擊。
我希望這有助於開發自己的解決方案。
所有這些都說,讓我注意下次如果你問一個問題,實際上提供了一些你嘗試過的代碼,或者嘗試提出一個更具體的問題,因為這對於這個網站來說可能太寬泛了。 無論如何,我把它留在這里,也許其他人會發現它也很有用。
重要的一課: ChromiumWebBrowser
上有一些可用於實現搜索功能的方法(即: Find
和StopFinding
)。
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