其他信息 – 7/26/10
我在MSDN网站上找到了一些有趣的API：
TextBox.GetFirstVisibleLineIndex Method
TextBox.GetLastVisibleLineIndex Method
TextBox.ScrollToLine Method
那里的文档看起来很有希望,但是当我尝试使用它时,我的编译器(Microsoft Visual C#2008 Express Edition)就会抱怨,即使在将PresenationFramework作为引用添加并使用System.Windows.Controls插入之后也是如此;在文件的顶部：
Error 1 ‘System.Windows.Forms.TextBox’ does not contain a definition for ‘GetFirstVisibleLineIndex’ and no extension method ‘GetFirstVisibleLineIndex’ accepting a first argument of type ‘System.Windows.Forms.TextBox’ could be found (are you missing a using directive or an assembly reference?)
其他信息 – 7/27/10
我正在努力实现Jay的实现新控件的建议,但是我无法将eventhandler绑定到控件中.这是我到目前为止所拥有的：
public partial class MyFormApplication : Form
{
public MyFormApplication() // MyFormApplication constructor
{
this.InitializeComponent();
this.textBox1.Dispose(); // Replacing with textBoxSync1
this.textBox2.Dispose(); // Replacing with textBoxSync2
// Draw textBoxSync1
this.textBoxSync1.AcceptsReturn = true;
this.textBoxSync1.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
| System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.textBoxSync1.BackColor = System.Drawing.SystemColors.Control;
this.textBoxSync1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
this.textBoxSync1.Font = new System.Drawing.Font("Courier New",8.25F,System.Drawing.FontStyle.Regular,System.Drawing.GraphicsUnit.Point,((byte)(0)));
this.textBoxSync1.Location = new System.Drawing.Point(0,19);
this.textBoxSync1.Multiline = true;
this.textBoxSync1.Name = "textBoxSync1";
this.textBoxSync1.ReadOnly = true;
this.textBoxSync1.ScrollBars = System.Windows.Forms.ScrollBars.Both;
this.textBoxSync1.Size = new System.Drawing.Size(338,231);
this.textBoxSync1.TabIndex = 0;
this.textBoxSync1.TabStop = false;
this.textBoxSync1.WordWrap = false;
this.splitContainer1.Panel1.Controls.Remove(this.textBox1);
this.splitContainer1.Panel1.Controls.Add(this.textBoxSync1);
// Draw textBoxSync2
this.textBoxSync2.AcceptsReturn = true;
this.textBoxSync2.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
| System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.textBoxSync2.BackColor = System.Drawing.SystemColors.Control;
this.textBoxSync2.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
this.textBoxSync2.Font = new System.Drawing.Font("Courier New",((byte)(0)));
this.textBoxSync2.Location = new System.Drawing.Point(0,19);
this.textBoxSync2.Multiline = true;
this.textBoxSync2.Name = "textBoxSync2";
this.textBoxSync2.ReadOnly = true;
this.textBoxSync2.ScrollBars = System.Windows.Forms.ScrollBars.Both;
this.textBoxSync2.Size = new System.Drawing.Size(113,231);
this.textBoxSync2.TabIndex = 30;
this.textBoxSync2.TabStop = false;
this.textBoxSync2.WordWrap = false;
this.splitContainer1.Panel2.Controls.Remove(this.textBox2);
this.splitContainer1.Panel2.Controls.Add(this.textBoxSync2);
/* Goes on to perform other initializations... */
}
private void textBoxSync1_VerticalScroll(Message msg)
{
msg.HWnd = this.textBoxSync2.Handle;
this.textBoxSync2.PubWndProc(ref msg);
}
private void textBoxSync2_VerticalScroll(Message msg)
{
msg.HWnd = this.textBoxSync1.Handle;
this.textBoxSync1.PubWndProc(ref msg);
}
}
public class TextBoxSynchronizedScroll : System.Windows.Forms.TextBox
{
public event vScrollEventHandler VerticalScroll;
public delegate void vScrollEventHandler(System.Windows.Forms.Message message);
public const int WM_VSCROLL = 0x115;
protected override void WndProc(ref System.Windows.Forms.Message msg)
{
if (msg.Msg == WM_VSCROLL)
{
if (VerticalScroll != null)
{
VerticalScroll(msg);
}
}
base.WndProc(ref msg);
}
public void PubWndProc(ref System.Windows.Forms.Message msg)
{
base.WndProc(ref msg);
}
}
我应该认为……
this.textBoxSync1.VerticalScroll += new System.EventHandler(this.textBoxSync1_VerticalScroll);
…需要将垂直滚动事件挂钩到控件中,但正如您可能看到的,这不起作用.任何建议,将不胜感激.谢谢.
解决方法
回复您的编辑：
注意：我假设您在复制并粘贴到应用程序表单中时出现了一个小错误,而且textBoxSyncBusTraffic == textBoxSync1
问题出在你的控件的VerticalScroll事件声明中,在这一行：
this.textBoxSyncBusTraffic.VerticalScroll += new System.EventHandler(this.textBoxSyncBusTraffic_VerticalScroll);
>您的自定义控件需要订阅控件的TextBoxSynchronizedScroll.vScrollEventHandler事件(而不是System.EventHandler).
>事件处理程序中引用的方法不存在(至少不在您发布的代码中).
所以改变这个：
this.textBoxSyncBusTraffic.VerticalScroll += new System.EventHandler(this.textBoxSyncBusTraffic_VerticalScroll);
对此：
this.textBoxSync1.VerticalScroll += new TextBoxSynchronizedScroll.vScrollEventHandler(textBoxSync1_VerticalScroll);
这使用正确的事件处理程序并引用您需要和已有的方法.
另外,请确保textBoxSync2的VerticalScroll事件的声明如下所示：
this.textBoxSync2.VerticalScroll += new TextBoxSynchronizedScroll.vScrollEventHandler(textBoxSync2_VerticalScroll);
顺便提一下,您可以使用几种技术来更轻松地声明事件：
首先是使用表单设计器.如果在窗体设计器中的扩展控件实例的“属性”窗口中打开“事件”窗口,则会看到名为VerticalScroll的事件.双击此项以使Visual Studio声明事件并创建一个在事件触发时调用的方法.
在代码中设置事件时,还可以使用快捷方式.键入以下代码后,您会发现：
youtextBoxSync1.VerticalScroll +=
