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VB.net2008精彩实例,窗体应用技巧

  窗体应用技巧二,创建透明的窗体。

  创建新工程后,选择Form1窗体,添加Label1、TrackBar1、Timer1控件。为了突出效果为窗体选择一个好看的背景。

  相关的属性设置如下:
TrackBar1 Value属性:
TickFrequency: 属性:
Maximum属性: 100
10
100
Label1 Text属性: 选择窗体的透明度:
Timer1 Interval属性: 100

  进入代码编辑器,输入代码:

  首先进行声明:

Public Class Form1
    
Inherits System.Windows.Forms.Form
    
Dim tps As Integer
Dim bol As Boolean


  进入TrackBar1_Scroll事件

Private Sub TrackBar1_Scroll(ByVal sender As Object, ByVal e As System.EventArgs) Handles TrackBar1.Scroll
        
Me.Opacity = TrackBar1.Value / 100
        Label1.Text
= "窗体透明度:" & CStr(Me.Opacity * 100) & "%"
End Sub


  进入Timer1_Tick事件

Private Sub Timer1_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        
If bol = False Then
            tps
= tps + 1
            
Me.Opacity = tps / 100
            
If Me.Opacity >= 1 Then
                Timer1.Enabled
= False
                bol
= True
            
End If
        
Else
            tps
= tps - 1
            
Me.Opacity = tps / 100
            
If Me.Opacity <= 0 Then
                Timer1.Enabled
= False
                bol
= False
            
End If
        
End If
    
End Sub


  进入Form1_Load事件

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Timer1.Enabled
= True
End Sub

  进入Form1_Closing事件

Private Sub Form1_Closing(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles MyBase.Closing
        Timer1.Enabled
= True
        
If MsgBox("你确实要关闭窗体吗?", MsgBoxStyle.OkCancel) = MsgBoxResult.Ok Then
            e.Cancel
= False
        
Else
            Timer1.Enabled
= False
            
Me.Opacity = 1
            tps
= 100
            bol
= True
            e.Cancel
= True
        
End If
End Sub

  创建完成后我们来运行程序测试一下,测试成功,程序窗体是不是变得透明了,通过调节滚动条我们甚至可以使得窗体消失达到完全隐形的目的。这是不是很神奇呢?
 

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