ch9_demoform004.cs

章立民－visual stadio 2005 c＃编程技巧

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using CH9.Properties;
using System.IO;

namespace CH9
{
    public partial class CH9_DemoForm004 : Form
    {
        public CH9_DemoForm004()
        {
            InitializeComponent();
        }

        private const int myBUFFER = 20;
        private XmlDocument xmldoc = new XmlDocument();

        private void CH5_DemoForm004_Load(object sender, EventArgs e)
        {
            // 呼叫 GoHome 方法来导览至首页。
            this.webBrowser1.GoHome();

            // 更新「上一页」与「下一页」按钮。
            UpdateButtons();

            this.InitializeOpenFileDialog();

            // 呼叫 AddToolStripButtons() 程序以便加载 XML 档案中的网站清单。
            AddToolStripButtons();
        }

        private void backButton_ButtonDoubleClick(object sender, EventArgs e)
        {
            this.webBrowser1.GoBack();
        }

        private void forwardButton_ButtonClick(object sender, EventArgs e)
        {
            this.webBrowser1.GoForward();
        }

        private void stopButton_Click(object sender, EventArgs e)
        {
            this.webBrowser1.Stop();
        }

        private void refreshButton_Click(object sender, EventArgs e)
        {
            this.webBrowser1.Refresh();
        }

        private void homeButton_Click(object sender, EventArgs e)
        {
            this.webBrowser1.GoHome();
        }

        private void searchButton_Click(object sender, EventArgs e)
        {
            this.webBrowser1.GoSearch();
        }

        // 「移至」按钮的Click事件处理例程。
        private void tsbGo_Click(object sender, EventArgs e)
        {
            this.NavigateToURL();
        }

        private void urlTextBox_KeyDown(object sender, KeyEventArgs e)
        {
            // 按下 Enter 键便会导览至所键入的 URL。
            if (e.KeyCode == Keys.Enter)
            {
                this.NavigateToURL();
            }
        }

        private void webBrowser1_Navigating(object sender, WebBrowserNavigatingEventArgs e)
        {
            // 更新「上一页」与「下一页」按钮。
            UpdateButtons();

            this.tsWebProgressBar.Visible = true;
        }

        private void webBrowser1_Navigated(object sender, WebBrowserNavigatedEventArgs e)
        {
            // 更新「上一页」与「下一页」按钮。
            UpdateButtons();

            // 更新 URL 文字方块。
            this.urlTextBox.Text = this.webBrowser1.Url.ToString();

            // 更新文字。
            this.statusText.Text = "正在打开网页 " + this.webBrowser1.Url.ToString();
        }

        private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            this.statusText.Text = "完成";
            this.UpLevelButton.Enabled = canGoUp(formatPath(this.urlTextBox.Text));
            this.tsWebProgressBar.Visible = false;
            this.tsWebProgressBar.Value = 0;
        }

        private void NavigateToURL()
        {
            try
            {
                this.webBrowser1.Navigate(formatPath(this.urlTextBox.Text));
            }
            catch
            {
                MessageBox.Show("无效的 URL。", this.Text, MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private string formatPath(string myPath)
        {
            string trimmed = myPath.Trim();

            if (trimmed.StartsWith("file:"))
            {
                trimmed = trimmed.Replace("file:///", "");
                trimmed = trimmed.Replace("file://", "\\");
                trimmed = trimmed.Replace("/", @"\");
            }

            return trimmed;
        }

        private void UpLevelButton_Click(object sender, EventArgs e)
        {
            string myPath = formatPath(this.webBrowser1.Url.ToString());

            if (canGoUp(myPath))
            {
                myPath = myPath.Substring(0, myPath.LastIndexOf(@"\"));

                try
                {
                    this.webBrowser1.Navigate(myPath);
                }
                catch
                {
                    UpLevelButton.Enabled = false;
                }
            }
        }

        private bool canGoUp(string myPath)
        {
            myPath = myPath.TrimStart(@"\".ToCharArray());
            myPath += @"\";

            return (!(myPath.IndexOf(@"\") == myPath.LastIndexOf(@"\")) && !((myPath.IndexOf(@"\") + 1) == myPath.LastIndexOf(@"\")));
        }

        private void UpdateButtons()
        {
            // 更新「上一页」与「下一页」按钮。
            this.backButton.Enabled = this.webBrowser1.CanGoBack;
            this.forwardButton.Enabled = this.webBrowser1.CanGoForward;
        }

        // 本程序用来设定「开启档案」对话框的各项属性。 
        private void InitializeOpenFileDialog()
        {
            // 设定「开启档案」对话框的初始目录。
            OpenFileDialog1.InitialDirectory = Environment.CurrentDirectory + @"\HTML";

            // 设定文件名筛选字符串以方便选取特定格式的档案。
            OpenFileDialog1.Filter =
             "网页 (*.HTM;*.HTML)|*.HTM;*.HTML|XML 文件(*.XML)|*.XML|Flash 文件(*.SWF)|*.SWF|Office 文件(*.DOC;*.XLS;*.PPT)|*.DOC;*.XLS;*.PPT";

            // 设定「开启档案」对话框的标题。
            OpenFileDialog1.Title = "请选取特定格式文件";

            // 设定「开启档案」对话框在关闭前还原目前的目录。
            OpenFileDialog1.RestoreDirectory = true;
        }

        private void webBrowser1_ProgressChanged(object sender, WebBrowserProgressChangedEventArgs e)
        {
            this.tsWebProgressBar.Value = (int)(((e.CurrentProgress / e.MaximumProgress) * 100));
        }

        private void BrowserToolStrip_Resize(object sender, EventArgs e)
        {
            maximizeToolStripItem(this.BrowserToolStrip, this.urlTextBox, myBUFFER);
        }

        private void maximizeToolStripItem(ToolStrip parentToolStrip, ToolStripItem maximizedItem, int myBuffer)
        {
            int width = parentToolStrip.Width - (parentToolStrip.Padding.Horizontal + myBuffer);

            foreach (ToolStripItem item in parentToolStrip.Items)
            {
                if (!(item.Equals(maximizedItem)))
                {
                    width -= item.Width;
                }

                width -= item.Margin.Horizontal;
            }

            maximizedItem.Width = width;
        }

        private void printButton_Click(object sender, EventArgs e)
        {
            this.webBrowser1.Print();
        }

        #region "自定义工具栏程序代码区块"
        private void AddToolStripButtons()
        {
            DirectoryInfo di = new DirectoryInfo(Environment.CurrentDirectory);
            Settings mySetting = new Settings();

            // 加载内含网站清单的 XML 档案。
            xmldoc.Load(di.ToString() + @"\" + mySetting.XmlFileName);

            // 清除 ToolStrip2 此一工具列所内含的所有项目。
            ToolStrip2.Items.Clear();

            // 循环处理 XML 档案并将每一个网站信息加载成一个 ToolStripButton 控件。
            XmlNodeList websiteNodes;

            websiteNodes = xmldoc.GetElementsByTagName("WebSite");
            int iCount = 1;

            foreach (XmlNode webSiteNode in websiteNodes)
            {
                XmlNodeList eachSiteNodes;

                eachSiteNodes = webSiteNode.ChildNodes;

                foreach (XmlNode eachSiteNode in eachSiteNodes)
                {
                    if (eachSiteNode.Name == "Name")
                    {
                        // 呼叫 AddTSButton 程序以便替每一个网站定义建立一个 ToolStripButton 控件。
                        AddTSButton("tsWebsite" + iCount.ToString(), eachSiteNode.InnerText);
                        iCount += 1;
                    }
                }
            }
        }

        private void AddTSButton(string buttonName, string webSiteName)
        {
            // 建立一个 ToolStripButton 对象。
            System.Windows.Forms.ToolStripButton newbutton = new System.Windows.Forms.ToolStripButton();

            // 设定 ToolStripButton 对象的各个属性。
            newbutton.Name = buttonName;
            newbutton.Text = webSiteName;
            newbutton.Image = Resources.stspeopl;
            newbutton.DisplayStyle = ToolStripItemDisplayStyle.ImageAndText;

            // 将 ToolStripButton 对象加入至 ToolStrip2 工具列中。
            ToolStrip2.Items.Add(newbutton);

            // 设定当此发此 ToolStripButton 对象的 Click 时就执行事件处理例程 tsbutton_Click。
            newbutton.Click += new System.EventHandler(tsbutton_Click);
        }

        private void tsbutton_Click(object sender, System.EventArgs e)
        {
            ToolStripButton aButton = (ToolStripButton)(sender);
            GoToUrl(aButton.Text);
        }

        private void GoToUrl(string sWebsite)
        {
            string xPath = @"//WebSite[Name='" + sWebsite + "']/URL";
            XmlNode xn = xmldoc.SelectSingleNode(xPath);

            webBrowser1.Url = new Uri(xn.InnerText);
        }

        private void tsbManage_Click(object sender, EventArgs e)
        {
            Sites frmManage = new Sites();
            frmManage.ShowDialog();

            AddToolStripButtons();
        }

        private void tsbMsTaiwan_Click(object sender, EventArgs e)
        {
            webBrowser1.Url = new Uri("http://www.microsoft.com/china");
        }

        private void tsbMSDNCHT_Click(object sender, EventArgs e)
        {
            webBrowser1.Url = new Uri("http://www.microsoft.com/china/msdn/");
        }

        private void tsbCommunity_Click(object sender, EventArgs e)
        {
            webBrowser1.Url = new Uri("http://www.microsoft.com/china/community/");
        }
        #endregion
    }
}