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http://www.up2e.com/resource.php **
用vb.net实现写字板程序报告(三)--- by zigz( LuHai )
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**3) 关于查找替换功能
** 这里我用了一个 Panel面板控件来放查找,查找下一个,替换按钮和文本框。
图 4 查找替换
我为什么不用一个窗体呢?因为我正好想练练拖动控件的代码,可以实现让这个面板在主窗体范围内拖动,由于看到了一个老外的教程,就顺便翻译了来练习练习。首先说说这个简单的查找替换功能,就是用户在第一个文本框中输入希望查找的字,然后点击查找按钮,程序就会在 RichTextBox中查找相匹配的字,找到之后,将其高亮显示,点击下一个按钮,就会找到下一个匹配的字。。如此反复,直到结束,而替换就是把所有在RichTextBox中第一个文本框中的内容用第二个文本框的内容替换。 是不是有些绕口令?还是亲自尝试一下就知道了。下面是查找替换相关代码(主要是创建一个 FindText函数):
' 下面是关于实现查找功能
Dim MyPos As Integer ' 先声明一个全局变量
Private Sub FindText( ByVal start As Integer ) ' 创建 findtext 函数
Dim pos As Integer
Dim target As String
' 获取用户输入的要查找的字符串
target = txtbox.Text
pos = InStr(start, rtbox.Text, target)
If pos > 0 Then ' 找到了匹配字符串
MyPos = pos
rtbox.SelectionStart = MyPos - 1 ' 高亮显示
rtbox.SelectionLength = Len(txtbox.Text)
rtbox.Focus()
Else
MsgBox(" 没找到! ")
End If
End Sub ** **
** 给 find按钮,findNext按钮 **
Private Sub find_Click( ByVal sender As System.Object, ByVal e As System.EventArgs) Handles find.Click
FindText(1)
End Sub
Private Sub findnext_Click( ByVal sender As System.Object, ByVal e As System.EventArgs) Handles findnext.Click
FindText(MyPos + 1)
End Sub ** **
** 拖动控件的代码: **
' 下面这段程序,用作拖拽“查找面板”使用
Dim dragging As Boolean
Dim mousex As Integer
Dim mousey As Integer
Private Sub panel1_MouseDown( ByVal sender As Object , ByVal e As System.Windows.Forms.MouseEventArgs) Handles Panel1.MouseDown
If e.Button = MouseButtons.Left Then
dragging = True
mousex = -e.X
mousey = -e.Y
Dim clipleft As Integer = Me .PointToClient(MousePosition).X - Panel1.Location.X
Dim cliptop As Integer = Me .PointToClient(MousePosition).Y - Panel1.Location.Y
Dim clipwidth As Integer = Me .ClientSize.Width - (Panel1.Width - clipleft)
Dim clipheight As Integer = Me .ClientSize.Height - (Panel1.Height - cliptop)
Cursor.Clip = Me .RectangleToScreen( New Rectangle(clipleft, cliptop, clipwidth, clipheight))
Panel1.Invalidate()
End If
End Sub
Private Sub panel1_MouseMove( ByVal sender As Object , ByVal e As System.Windows.Forms.MouseEventArgs) Handles Panel1.MouseMove
If dragging Then
' 移动控件到新的位置
Dim MPosition As New Point()
MPosition = Me .PointToClient(MousePosition)
MPosition.Offset(mousex, mousey)
' 确实控件不能离开主窗口
Panel1.Location = MPosition
End If
End Sub
Private Sub panel1_MouseUp( ByVal sender As Object , ByVal e As System.Windows.Forms.MouseEventArgs) Handles Panel1.MouseUp
If dragging Then
' 结束拖拽
dragging = False
Cursor.Clip = Nothing
Panel1.Invalidate()
End If
End Sub
未完待续......