基于Chromium构建Chrome WebBrowser for .net 控件（还有点心得体会）

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
using libfuncs;namespace cwber
{
public partial class ChromeWebBrowser : UserControl
{
private ChromeApp chrome = null;
ToolTip myToolTip = new ToolTip();
public ChromeWebBrowser()
{
InitializeComponent();
ChromeWebBrowser.CheckForIllegalCrossThreadCalls = false;
} private void ChromeWebBrowser_Load(object sender, EventArgs e)
{
if (chrome == null)
{
chrome = new ChromeApp();
}
Start(); } #region 外部调用方法
libfuncs.DocumentCompletedEvent elementEvent1;
libfuncs.FrameLoadStartEvent elementEvent2;
libfuncs.FrameLoadEndEvent elementEvent3;
libfuncs.FileDownloadingEvent fileDownloading;
libfuncs.FileDownloadCompletedEvent fileDownloaded;
libfuncs.ComponentInitialized componentInitialized;
libfuncs.ToolTipEventListener toolTipEvent;
public void Start()
{
if (chrome != null)
{
chrome.Dock = DockStyle.Fill; if (componentInitialized == null)
{
componentInitialized = new libfuncs.ComponentInitialized(componentInitializedEvent);
chrome.RegisterEvent(componentInitialized);
}
Controls.Add(chrome);
if (elementEvent1 == null)
{
elementEvent1 = new libfuncs.DocumentCompletedEvent(documentComplete);
chrome.RegisterEvent(elementEvent1);
}
if (elementEvent2 == null)
{
elementEvent2 = new libfuncs.FrameLoadStartEvent(frameStartStart);
chrome.RegisterEvent(elementEvent2);
}
if (elementEvent3 == null)
{
elementEvent3 = new libfuncs.FrameLoadEndEvent(frameLoadEnd);
chrome.RegisterEvent(elementEvent3);
}
if (fileDownloading == null)
{
fileDownloading = new libfuncs.FileDownloadingEvent(this.downloading);
chrome.RegisterEvent(fileDownloading);
}
if (fileDownloaded == null)
{
fileDownloaded = new libfuncs.FileDownloadCompletedEvent(this.downloaded);
chrome.RegisterEvent(fileDownloaded);
}
if (toolTipEvent == null)
{
toolTipEvent = new libfuncs.ToolTipEventListener(this.ShowToolTipText);
chrome.RegisterEvent(toolTipEvent);
} chrome.Visible = true;
chrome.BringToFront();
}
}
/*
* 描述：释放浏览器
*/
public void Free()
{
elementEvent1 = null;
elementEvent2 = null;
elementEvent3 = null;
fileDownloading = null;
fileDownloaded = null;
componentInitialized = null;
toolTipEvent = null;
chrome.Dispose();
chrome = null;
}
/*
* 参数：Url 打开网页地址
* 描述：打开网址。
*/
public void OpenUrl(string Url)
{
if (chrome != null)
chrome.Load(Url);
}
/*
* 参数：id 网页中的控件元素ID
* 描述：根据元素ID获取元素的值，适用于Input，A标签元素
*/
public string GetElementValueById(string id)
{
return chrome == null ? "" : chrome.GetElementValueById(id);
}
/*
* 参数：id 网页中的控件元素ID, value 元素新值
* 描述：为页面中元素赋予新值。
*/
public void SetElementValueById(string id, string value)
{
if (chrome != null)
{
chrome.SetElementValueById(id, value);
}
} public delegate void TCallBackElementEventListener();
private List<libfuncs.ElementEventListener> elementEventList = new List<libfuncs.ElementEventListener>();
/*
* 描述：附加元素的侦听事件。当该元素触发附加事件时，则执行TCallBackElementEventListener委托方法
*/
public void AppendElementEventListener(string id, string eventName, TCallBackElementEventListener callFunc)
{
libfuncs.ElementEventListener elementEvent = new libfuncs.ElementEventListener(callFunc);
elementEventList.Add(elementEvent);
chrome.AddElementEventListener(id, eventName, elementEvent);
}
/*
* 描述：向页面中注入并执行脚本。
*/
public void ExecuteScript(string script)
{
if (chrome != null)
chrome.ExecuteScript(script);
} public object EvaluateScript(string script)
{
if (chrome != null)
return chrome.EvaluateScript(script);
else
return null;
} /*
* 描述：计算文件单位。用于文件下载。
*/
private string CompareFileSize(Int64 size)
{
//计算K,M单位
string strTotalSize = string.Empty;
if (size < )
{
strTotalSize = size.ToString() + " B";
}
else if (size >= && size < * )
{
strTotalSize = (size / ).ToString() + " KB";
}
else
{
strTotalSize = (size / / ).ToString() + " MB";
}
return strTotalSize;
} #endregion #region 属性
public string Url
{
get
{
return chrome == null?"":chrome.Core.Address;
}
}
#endregion #region 事件
/*控件初始化事件*/
public event EventHandler ComponentInitializedEventHandler;
private void componentInitializedEvent()
{
EventArgs e = new EventArgs();
if (ComponentInitializedEventHandler != null)
ComponentInitializedEventHandler(this, e);
}
/*页面加载完成事件*/
public event EventHandler DocumentCompletedEventHandler;
private void documentComplete()
{
EventArgs e = new EventArgs();
if (DocumentCompletedEventHandler != null)
DocumentCompletedEventHandler(this, e);
}
/*Frame加载完成事件，这里的Frame可以是页面本身，也是iFrame元素*/
public event EventHandler PageLoadFinishEventHandler;
private void frameLoadEnd()
{
EventArgs e = new EventArgs();
if (PageLoadFinishEventHandler != null)
PageLoadFinishEventHandler(this, e);
}
/*Frame加载开始事件，这里的Frame可以是页面本身，也是iFrame元素*/
public event EventHandler PageLoadStartEventHandler;
private void frameStartStart()
{
EventArgs e = new EventArgs();
if (PageLoadStartEventHandler != null)
PageLoadStartEventHandler(this, e);
}
/*下载中事件，不开放该事件*/
Form downloadForm = null;
private void downloading(Int64 totalSize, Int64 loadedSize)
{
string strTotalSize = CompareFileSize(totalSize);
string strLoadedSize = CompareFileSize(loadedSize); if (downloadForm == null)
{
downloadForm = new Form();
downloadForm.Text = "下载中";
downloadForm.Width = ;
downloadForm.Height = ;
downloadForm.MaximizeBox = false;
downloadForm.MinimizeBox = false;
downloadForm.ControlBox = false;
downloadForm.StartPosition = FormStartPosition.CenterScreen; Label label = new Label();
label.Left = ;
label.Top = ;
label.Width = ;
label.Text = "已下载：" + strLoadedSize + "/" + strTotalSize;
downloadForm.Controls.Add(label);
}
downloadForm.Show();
downloadForm.BringToFront();
foreach (Control c in downloadForm.Controls)
{
if (c is Label)
{
Label label = (Label)c;
label.Text = "已下载：" + strLoadedSize + "/" + strTotalSize;
label.Update();
}
}
downloadForm.Update();
}
/*下载完成事件，不开放该事件*/
private void downloaded()
{
if (downloadForm != null)
downloadForm.Close();
downloadForm = null;
}
/*消息提示事件，不开放*/
private void ShowToolTipText(string text)
{
if (chrome == null) return;
if (string.IsNullOrEmpty(text))
{
myToolTip.RemoveAll();
return;
}
//保证每行40个字
int len = text.Length;
int offset = ;
int count = len / offset;
for (int i = ; i <= count; i++)
{
text = text.Insert(offset * i, "\n");
}
myToolTip.ShowAlways = false;
myToolTip.UseAnimation = true;
myToolTip.UseFading = true;
//t.SetToolTip(button1, text);
Point p = Control.MousePosition;
Point p1 = this.PointToClient(p);
myToolTip.Show(text, chrome, p1.X+, p1.Y+);
}
#endregion
}
}