formbar.cs

CS导航Logo ,在Logo上显示Loading

using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Windows.Forms;

namespace BufferedUploadWin
{
	/// <summary>
	/// Summary description for FormBar.
	/// </summary>
	public class FormBar : System.Windows.Forms.UserControl
	{
		public System.Windows.Forms.StatusBar statusBar1;
		private System.Windows.Forms.StatusBarPanel statusBarPanel1;
		private System.Windows.Forms.StatusBarPanel statusBarPanel2;
		public System.Windows.Forms.ProgressBar progressBar;
		private System.ComponentModel.IContainer components;
		private System.Windows.Forms.ImageList imageListStatusbar;
		private StringFormat format;	// a formatter for the status bar messages	
		
		public FormBar()
		{
			InitializeComponent();
			InitFormatter();
		}

		/// <summary>
		/// The status par panel should be set to owner draw.
		/// This method draws a wait cursor in the status bar, 
		/// if the progress bar is visible. 
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		private void statusBar_DrawItem(object sender, System.Windows.Forms.StatusBarDrawItemEventArgs e)
		{
			Graphics g = e.Graphics; 
			RectangleF bounds = new RectangleF(e.Bounds.Left, e.Bounds.Top, e.Bounds.Width, e.Bounds.Height);
			// display a busy icon if currently busy (displaying the progress bar)
			if(e.Index == 0)
			{
				if(this.progressBar.Visible)
				{
					// draw the icon
					this.imageListStatusbar.Draw(g, (int)bounds.Left + 2, (int)bounds.Top + (((int)bounds.Height - imageListStatusbar.ImageSize.Height)) / 2, 0);
					// adjust the drawing area to make room for the icon
					bounds.X += this.imageListStatusbar.ImageSize.Width + 5;
					bounds.Width -= this.imageListStatusbar.ImageSize.Width + 5;		
				}				
			}
			// display the status bar text, display ellipsis for long strings
			g.DrawString(e.Panel.Text, statusBar1.Font, SystemBrushes.ControlText, bounds, format);
		}

		private void progressBar_VisibleChanged(object sender, System.EventArgs e)
		{
			this.statusBar1.Refresh();
		}
		
		/// <summary>
		/// Used to specify the strings used in the status bar
		/// </summary>
		private void InitFormatter()
		{
			format = new StringFormat();
			format.FormatFlags = StringFormatFlags.NoWrap;
			format.LineAlignment = StringAlignment.Center;
			format.Trimming = StringTrimming.EllipsisCharacter;
		}		

		private delegate void updateMessageDel(string msg);
		public void UpdateStatusBarMessage(string msg)
		{
			if(this.InvokeRequired)
			{
				// switch to UI thread
				updateMessageDel del = new updateMessageDel(this.UpdateStatusBarMessage);
				BeginInvoke(del, new object[]{msg});
				return;
			}
			this.statusBar1.Panels[0].Text = msg;
		}

		private delegate void updateProgressBarDel(int newValue);
		public void UpdateProgressBar(int newValue)
		{
			if(this.InvokeRequired)
			{
				// switch to UI thread
				updateProgressBarDel del = new updateProgressBarDel(this.UpdateProgressBar);
				BeginInvoke(del, new object[]{newValue});
				return;
			}
			if(newValue <= this.progressBar.Maximum)
				this.progressBar.Value = newValue;
		}

		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if(components != null)
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Component Designer generated code
		/// <summary> 
		/// Required method for Designer support - do not modify 
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.components = new System.ComponentModel.Container();
			System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(FormBar));
			this.statusBar1 = new System.Windows.Forms.StatusBar();
			this.statusBarPanel1 = new System.Windows.Forms.StatusBarPanel();
			this.statusBarPanel2 = new System.Windows.Forms.StatusBarPanel();
			this.progressBar = new System.Windows.Forms.ProgressBar();
			this.imageListStatusbar = new System.Windows.Forms.ImageList(this.components);
			((System.ComponentModel.ISupportInitialize)(this.statusBarPanel1)).BeginInit();
			((System.ComponentModel.ISupportInitialize)(this.statusBarPanel2)).BeginInit();
			this.SuspendLayout();
			// 
			// statusBar1
			// 
			this.statusBar1.Location = new System.Drawing.Point(0, -1);
			this.statusBar1.Name = "statusBar1";
			this.statusBar1.Panels.AddRange(new System.Windows.Forms.StatusBarPanel[] {
																						  this.statusBarPanel1,
																						  this.statusBarPanel2});
			this.statusBar1.ShowPanels = true;
			this.statusBar1.Size = new System.Drawing.Size(640, 22);
			this.statusBar1.TabIndex = 4;
			this.statusBar1.DrawItem += new System.Windows.Forms.StatusBarDrawItemEventHandler(this.statusBar_DrawItem);
			// 
			// statusBarPanel1
			// 
			this.statusBarPanel1.Style = System.Windows.Forms.StatusBarPanelStyle.OwnerDraw;
			this.statusBarPanel1.Text = "Ready";
			this.statusBarPanel1.Width = 300;
			// 
			// statusBarPanel2
			// 
			this.statusBarPanel2.AutoSize = System.Windows.Forms.StatusBarPanelAutoSize.Spring;
			this.statusBarPanel2.Width = 324;
			// 
			// progressBar
			// 
			this.progressBar.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left) 
				| System.Windows.Forms.AnchorStyles.Right)));
			this.progressBar.Location = new System.Drawing.Point(307, 4);
			this.progressBar.Name = "progressBar";
			this.progressBar.Size = new System.Drawing.Size(312, 15);
			this.progressBar.Step = 1;
			this.progressBar.TabIndex = 5;
			this.progressBar.Visible = false;
			this.progressBar.VisibleChanged += new System.EventHandler(this.progressBar_VisibleChanged);
			// 
			// imageListStatusbar
			// 
			this.imageListStatusbar.ImageSize = new System.Drawing.Size(9, 14);
			this.imageListStatusbar.ImageStream = ((System.Windows.Forms.ImageListStreamer)(resources.GetObject("imageListStatusbar.ImageStream")));
			this.imageListStatusbar.TransparentColor = System.Drawing.Color.Lime;
			// 
			// FormBar
			// 
			this.Controls.Add(this.progressBar);
			this.Controls.Add(this.statusBar1);
			this.Name = "FormBar";
			this.Size = new System.Drawing.Size(640, 21);
			((System.ComponentModel.ISupportInitialize)(this.statusBarPanel1)).EndInit();
			((System.ComponentModel.ISupportInitialize)(this.statusBarPanel2)).EndInit();
			this.ResumeLayout(false);

		}
		#endregion
	}
}