Windows Phone 7 浏览器控件(WebBrowser) 支持历史记录，前进，后退,刷新。等功能

由于要在应用程序内部访问网页。不跳出应用。所以要实现一个浏览器。但是悲催的事windows phone8 的

WebBrowser控件已经支持了像CanGoBack ，CanGoForward，GoBack，GoForward等这些功能。但是

wp7没有。网上搜了搜也都是简单的WebBrowser的使用方法。暂时就实现了几个前进后退几个功能。用在

page里面也很简单。实现的效果如下图所示。



因为使用十分简单。和windows phone8上的WebBrowser一样的。我就直接给控件的代码，就帖使用的代码了。

代码如下。注释也都写的比较清楚。

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using System.Windows.Markup;
using System.Text.RegularExpressions;
using Microsoft.Phone.Tasks;
using System.Collections.Generic;
using System.Windows.Navigation;

namespace Controls.HcControl
{
public class HcWebView : Control
{
/// <summary>
/// Gets the ControlTemplate string for the control.
/// </summary>
/// <remarks>
/// Not in generic.xaml so the implementation of HcWebView can be entirely in this file.
/// </remarks>
private static string TemplateString
{
get
{
return
"<ControlTemplate " +
"xmlns=\"http://schemas.microsoft.com/winfx/2006/xaml/presentation\" " +
"xmlns:phone=\"clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone\" " +
"xmlns:x=\"http://schemas.microsoft.com/winfx/2006/xaml\">" +
"<Grid>" +
"<phone:WebBrowser x:Name=\"WebBrowser\" IsScriptEnabled=\"True\"/>" +
"</Grid>" +
"</ControlTemplate>";
}
}

//----------对象的内部成员
#region Member

/// <summary>
/// WebBrowser.
/// </summary>
private WebBrowser _webBrowser;

/// <summary>
/// 历史Uri记录堆栈
/// </summary>
private List<Uri> _historyStack;

/// <summary>
/// 历史记录堆栈索引
/// </summary>
private int _historyStackIndex;

/// <summary>
/// 导航到的Uri是否来自历史堆栈
/// </summary>
private bool _fromHistory;

private bool canGoBack;
/// <summary>
/// 获取一个值，该值指示 WebBrowser 是否可以在浏览历史记录中向前导航一个页面。
/// </summary>
public bool CanGoBack
{
get
{
return (_historyStackIndex > 1);
}
internal set
{
canGoBack = value;
}
}

private bool canGoForward;
/// <summary>
/// 获取一个值，该值指示 WebBrowser 是否可以在浏览历史记录中向前导航一个页面。
/// </summary>
public bool CanGoForward
{
get
{
return (_historyStackIndex < _historyStack.Count);
}
internal set
{
canGoForward = value;
}
}

#endregion

//----------对象的生命周期
#region LifeCycle

/// <summary>
/// Initializes a new instance of the HcWebView class.
/// </summary>
public HcWebView()
{
this._historyStack = new List<Uri>();
this._historyStackIndex = 0;
this._fromHistory = false;

this.Template = (ControlTemplate)XamlReader.Load(TemplateString);
}

/// <summary>
/// Invoked when a new Template is applied.
/// </summary>
public override void OnApplyTemplate()
{
base.OnApplyTemplate();

if (_webBrowser != null)
{
_webBrowser.LoadCompleted -= OnLoadCompleted;
_webBrowser.Navigated -= OnNavigated;
_webBrowser.Navigating -= OnNavigating;
_webBrowser.NavigationFailed -= OnNavigationFailed;
_webBrowser.ScriptNotify -= OnScriptNotify;
}

_webBrowser = GetTemplateChild("WebBrowser") as WebBrowser;

if (_webBrowser != null)
{
_webBrowser.LoadCompleted += OnLoadCompleted;
_webBrowser.Navigated += OnNavigated;
_webBrowser.Navigating += OnNavigating;
_webBrowser.NavigationFailed += OnNavigationFailed;
_webBrowser.ScriptNotify += OnScriptNotify;
}
}

#endregion

//----------对象响应的事件
#region Events

/// <summary>
/// 在 WebBrowser 控件已加载内容之后引发的事件。
/// </summary>
public event LoadCompletedEventHandler LoadCompleted;
private void OnLoadCompleted(object sender, NavigationEventArgs e)
{
if (LoadCompleted != null)
{
LoadCompleted(this, e);
}
}

/// <summary>
/// 在 WebBrowser 控件成功导航之后引发的事件。
/// <summary>
public event EventHandler<NavigationEventArgs> Navigated;
private void OnNavigated(object sender, NavigationEventArgs e)
{
if (!_fromHistory)
{
if (_historyStackIndex < _historyStack.Count)
{
_historyStack.RemoveRange(_historyStackIndex, _historyStack.Count - _historyStackIndex);
}
_historyStack.Add(e.Uri);
_historyStackIndex += 1;
}
_fromHistory = false;
if (Navigated != null)
{
Navigated(this, e);
}
}

/// <summary>
/// 当浏览器控件正在导航（包括从重定向）时引发的事件。
/// </summary>
public event EventHandler<NavigatingEventArgs> Navigating;
private void OnNavigating(object sender, NavigatingEventArgs e)
{
if (Navigating != null)
{
Navigating(this, e);
}
}

/// <summary>
/// 在 WebBrowser 控件导航失败之后引发的事件。
/// </summary>
public event NavigationFailedEventHandler NavigationFailed;
private void OnNavigationFailed(object sender, NavigationFailedEventArgs e)
{
if (NavigationFailed != null)
{
NavigationFailed(this, e);
}
}

/// <summary>
/// 当 Javascript 调用 window.external.notify(<data>) 时引发的事件
/// </summary>
public event EventHandler<NotifyEventArgs> ScriptNotify;
private void OnScriptNotify(object sender, NotifyEventArgs e)
{
if (ScriptNotify != null)
{
ScriptNotify(this, e);
}
}

#endregion

//----------对象的内部函数
#region Methods

/// <summary>
/// WebBrowser 在浏览历史记录中向后导航一个页面。
/// </summary>
public void GoBack()
{
if (_historyStackIndex > 1)
{
_historyStackIndex -= 1;
_fromHistory = true;
_webBrowser.Navigate(_historyStack[_historyStackIndex - 1]);
}
}

/// <summary>
///  WebBrowser 在浏览历史记录中向前导航一个页面。
/// </summary>
public void GoForward()
{
if (_historyStackIndex < _historyStack.Count)
{
_historyStackIndex += 1;
_fromHistory = true;
_webBrowser.Navigate(_historyStack[_historyStackIndex - 1]);
}
}

/// <summary>
/// Refresh HcWebView
/// </summary>
public void RefreshWebView()
{
if ((this._webBrowser) != null && (this._webBrowser.Source != null))
{
this._webBrowser.Source = new Uri(this._webBrowser.Source.ToString());
}
}

/// <summary>
/// 应用程序启动“Web 浏览器”应用程序。
/// </summary>
public void ShowWebBrowser()
{
WebBrowserTask webTask = new WebBrowserTask();
if ( (this._webBrowser) != null && (this._webBrowser.Source != null))
{
webTask.Uri = this._webBrowser.Source;
}
webTask.Show();
}

#endregion

//----------对象的依赖属性
#region DependencyProperty

#region Source DependencyProperty

/// <summary>
/// Gets or sets the Source.
/// </summary>
public Uri Source
{
get { return (Uri)GetValue(SourceProperty); }
set { SetValue(SourceProperty, value); }
}

/// <summary>
/// Identifies the Source dependency property.
/// </summary>
public static readonly DependencyProperty SourceProperty =
DependencyProperty.Register("Title", typeof(Uri), typeof(HcWebView), new PropertyMetadata(null, new PropertyChangedCallback(OnSourceChanged)));

/// <summary>
/// Prevents the webWiew Source from transitioning into a Semiexpanded or Collapsed visual state if the Source is not set.
/// </summary>
/// <param name="obj">The dependency object.</param>
/// <param name="e">The event information.</param>
private static void OnSourceChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
HcWebView webView = (HcWebView)obj;

if (e.NewValue != null)
{
webView._webBrowser.Source = e.NewValue as Uri;
}
}

#endregion

#endregion
}
}

谢谢阅读。