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Winform 下无闪烁走马灯效果实现

发布时间：2017-10-22 编辑：www.jquerycn.cn

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Winform 下无闪烁走马灯效果实现

作者：肖波
 最近需要在Winform项目中实现一个走马灯的效果，一开始用了一些办法比如移动Label控件，效果总是不太好，移动文本时总有闪烁的现象。后来找了一个国外的开源控件，应用了一下，效果还不错。仔细阅读了一下代码，发现还有一些地方值得改进，现把代码以及改动说明贴出来，和大家分享。
 控件出处：http://www.codeproject.com/KB/miscctrl/ScrollingTextControlArtic.aspx
 我的改动：
 1、DoubleBuffer 的设置
 原代码中用的是 this.SetStyle(ControlStyles.DoubleBuffer, true); 但一些网友反映这个标志在.net 2.0 以上版本无效。说句老实话，我也不是特别确信，MSDN上也没有说明这一点。在我的.net 2.0 系统中，两种设置的效果似乎没有太多区别。在一个国外网站上找到他们的区别，下面是原文：

ControlStyles == CS
AllPaintingInWMPaint == APWMP
OptimizedDoubleBuffer = ODB
DoubleBuffer = DB

An earlier permutation of the design called for ODB to simply be a combination of DB, APWMP and UserPaint. Through several design changes, the two control styles are nearly synonymous, but they still have differences. Now that we''ve broken that, we may consider un-deprecating CS.DB to retain . Here is a more complete summary of the current design:

<table style="WIDTH: 100%" cellspacing="1" cellpadding="1" border="1"> <tbody> <tr> <td>Mechanism</td> <td>Side effects</td> <td>Other flags required to work</td> <td>Require APWMP?</td> <td>Notes</td> </tr> <tr> <td>ControlStyle
.DB</td> <td>

none

</td> <td>

APWMP, UserPaint

</td> <td>

Yes

</td> <td>We are considering NOT deprecating this flag because ODB isn''t an exact replacement for DB.</td> </tr> <tr> <td>ControlStyle
.ODB</td> <td>

none

</td> <td>

none

</td> <td>

</td> <td>Works, but without APWMP set you''ll buffer foreground and background separately and will still see flicker.</td> </tr> <tr> <td>Control
.DoubleBuffered</td> <td>

sets CS.ODB, CS.APWMP

</td> <td>

none

</td> <td>

</td> <td>Works for most mainstream buffering needs. Getter is peculiar in that it only checks CS.ODB.</td> </tr> </tbody></table>

I''m following up on the need for deprecating CS.DB and Control.DoubleBuffered''s getter and will post here.

总之保险起见，还是判一下版本号，下面是判断代码

 Version v = System.Environment.Version;

 if (v.Major < 2)
 <span id="Codehighlighter1_94_174_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">{
 this.SetStyle(ControlStyles.DoubleBuffer, true);
 }
 else
 <span id="Codehighlighter1_204_293_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">{
 this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
 }
 2、刷新区域
 原代码中刷新区域是这样设置的

 private void Tick(object sender, EventArgs e)
 <span id="Codehighlighter1_50_395_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">{
 //update rectangle to include where to paint for new position
 //lastKnownRect.X -= 10;
 //lastKnownRect.Width = 20; 
 lastKnownRect.Inflate(10, 5);

 //create region based on updated rectangle
 Region updateRegion = new Region(lastKnownRect);

 //repaint the control 
 Invalidate(updateRegion);
 Update();
 }
lastKnownRect是文字的整个区域，如果文字较长，这个刷新区域就会比较大，但实际上我们只需要刷新控件显示范围内的区域就可以了。
所以这里改动如下：

 //Controls the animation of the text.
 private void Tick(object sender, EventArgs e)
 <span id="Codehighlighter1_90_833_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">{
 //update rectangle to include where to paint for new position
 //lastKnownRect.X -= 10;
 //lastKnownRect.Width = 20; 
 lastKnownRect.Inflate(10, 5);

 //get the display rectangle
 RectangleF refreshRect = lastKnownRect;
 refreshRect.X = Math.Max(0, lastKnownRect.X);
 refreshRect.Width = Math.Min(lastKnownRect.Width lastKnownRect.X, this.Width);
 refreshRect.Width = Math.Min(this.Width - lastKnownRect.X, refreshRect.Width);

 //create region based on updated rectangle
 //Region updateRegion = new Region(lastKnownRect); 
 Region updateRegion = new Region(refreshRect);

 //repaint the control 
 Invalidate(updateRegion);
 Update();
 }
 2、修改Enabled属性
 当Enabled设置为false时，原控件依然会滚动，觉得还是不让它滚动更好一些。
 修改代码如下：

 [
 Browsable(true),
 CategoryAttribute("Behavior"),
 Description("Indicates whether the control is enabled")
 ]
 new public bool Enabled
 <span id="Codehighlighter1_188_402_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">{
 set
 <span id="Codehighlighter1_218_310_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">{
 timer.Enabled = value;
 base.Enabled = value;
 }

 get
 <span id="Codehighlighter1_340_392_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">{
 return base.Enabled;
 }
 }
下面给出修改后完整的控件代码，代码原作者为jconwell，原始代码见前面提到的控件出处

using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Data;
using System.Windows.Forms;

namespace ScrollingTextControl
<span id="Codehighlighter1_202_12172_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">{
 <span id="Codehighlighter1_205_286_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">/**//// <summary>
 /// Summary description for ScrollingTextControl.
 /// </summary>
 [
 ToolboxBitmapAttribute(typeof(ScrollingTextControl.ScrollingText), "ScrollingText.bmp"),
 DefaultEvent("TextClicked")
 ]
 public class ScrollingText : System.Windows.Forms.Control
 <span id="Codehighlighter1_471_12003_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">{
 private Timer timer; // Timer for text animation.
 private string text = "Text"; // Scrolling text
 private float staticTextPos = 0; // The running x pos of the text
 private float yPos = 0; // The running y pos of the text
 private ScrollDirection scrollDirection = ScrollDirection.RightToLeft; // The direction the text will scroll
 private ScrollDirection currentDirection = ScrollDirection.LeftToRight; // Used for text bouncing 
 private VerticleTextPosition verticleTextPosition = VerticleTextPosition.Center; // Where will the text be vertically placed
 private int scrollPixelDistance = 2; // How far the text scrolls per timer event
 private bool showBorder = true; // Show a border or not
 private bool stopScrollOnMouseOver = false; // Flag to stop the scroll if the user mouses over the text
 private bool scrollOn = true; // Internal flag to stop / start the scrolling of the text
 private Brush foregroundBrush = null; // Allow the user to set a custom Brush to the text Font
 private Brush backgroundBrush = null; // Allow the user to set a custom Brush to the background
 private Color borderColor = Color.Black; // Allow the user to set the color of the control border
 private RectangleF lastKnownRect; // The last known position of the text

 public ScrollingText()
 <span id="Codehighlighter1_1821_2629_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">{
 // Setup default properties for ScrollingText control
 InitializeComponent();

 //This turns off internal double buffering of all custom GDI drawing

 Version v = System.Environment.Version;

 if (v.Major < 2)
 <span id="Codehighlighter1_2090_2170_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">{
 this.SetStyle(ControlStyles.DoubleBuffer, true);
 }
 else
 <span id="Codehighlighter1_2200_2289_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">{
 this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
 }

 this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
 this.SetStyle(ControlStyles.UserPaint, true);
 this.SetStyle(ControlStyles.ResizeRedraw, true);

 //setup the timer object
 timer = new Timer();
 timer.Interval = 25; //default timer interval
 timer.Enabled = true;
 timer.Tick = new EventHandler(Tick);
 }

 <span id="Codehighlighter1_2633_2705_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">/**//// <summary>
 /// Clean up any resources being used.
 /// </summary>
 protected override void Dispose( bool disposing )
 <span id="Codehighlighter1_2759_3126_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">{
 if( disposing )
 <span id="Codehighlighter1_2783_3092_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">{
 //Make sure our brushes are cleaned up
 if (foregroundBrush != null)
 foregroundBrush.Dispose();

 //Make sure our brushes are cleaned up
 if (backgroundBrush != null)
 backgroundBrush.Dispose();

 //Make sure our timer is cleaned up
 if (timer != null)
 timer.Dispose();
 }
 base.Dispose( disposing );
 }

 <span id="Codehighlighter1_3130_3554_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">Component Designer generated code#region Component Designer generated code
 <span id="Codehighlighter1_3174_3321_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">/**//// <summary>
 /// Required method for Designer support - do not modify
 /// the contents of this method with the code editor.
 /// </summary>
 private void InitializeComponent()
 <span id="Codehighlighter1_3360_3541_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">{
 //ScrollingText 
 this.Name = "ScrollingText";
 this.Size = new System.Drawing.Size(216, 40);
 this.Click = new System.EventHandler(this.ScrollingText_Click);
 }
 #endregion

 //Controls the animation of the text.
 private void Tick(object sender, EventArgs e)
 <span id="Codehighlighter1_3647_4390_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">{
 //update rectangle to include where to paint for new position
 //lastKnownRect.X -= 10;
 //lastKnownRect.Width = 20; 
 lastKnownRect.Inflate(10, 5);

 //get the display rectangle
 RectangleF refreshRect = lastKnownRect;
 refreshRect.X = Math.Max(0, lastKnownRect.X);
 refreshRect.Width = Math.Min(lastKnownRect.Width lastKnownRect.X, this.Width);
 refreshRect.Width = Math.Min(this.Width - lastKnownRect.X, refreshRect.Width);

 //create region based on updated rectangle
 //Region updateRegion = new Region(lastKnownRect); 
 Region updateRegion = new Region(refreshRect);

 //repaint the control 
 Invalidate(updateRegion);
 Update();
 }

 //Paint the ScrollingTextCtrl.
 protected override void OnPaint(PaintEventArgs pe)
 <span id="Codehighlighter1_4480_4779_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">{
 //Console.WriteLine(pe.ClipRectangle.X ", " pe.ClipRectangle.Y ", " pe.ClipRectangle.Width ", " pe.ClipRectangle.Height);

 //Paint the text to its new position
 DrawScrollingText(pe.Graphics);

 //pass on the graphics obj to the base Control class
 base.OnPaint(pe);
 }

 //Draw the scrolling text on the control 
 public void DrawScrollingText(Graphics canvas)
 <span id="Codehighlighter1_4877_6421_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">{
 canvas.SmoothingMode = SmoothingMode.HighQuality;
 canvas.PixelOffsetMode = PixelOffsetMode.HighQuality;

 //measure the size of the string for placement calculation
 SizeF stringSize = canvas.MeasureString(this.text, this.Font);

 //Calculate the begining x position of where to paint the text
 if (scrollOn)
 <span id="Codehighlighter1_5225_5266_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">{
 CalcTextPosition(stringSize);
 }

 //Clear the control with user set BackColor
 if (backgroundBrush != null)
 <span id="Codehighlighter1_5368_5491_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">{
 canvas.FillRectangle(backgroundBrush, 0, 0, this.ClientSize.Width, this.ClientSize.Height);
 }
 else
 <span id="Codehighlighter1_5521_5582_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">{
 canvas.Clear(this.BackColor);
 }

 // Draw the border
 if (showBorder)
 <span id="Codehighlighter1_5646_5836_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">{
 using (Pen borderPen = new Pen(borderColor))
 canvas.DrawRectangle(borderPen, 0, 0, this.ClientSize.Width - 1, this.ClientSize.Height - 1);
 }

 // Draw the text string in the bitmap in memory
 if (foregroundBrush == null)
 <span id="Codehighlighter1_5942_6146_Closed_Text" style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff">

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