VB.NET 2008精彩实例窗体应用技巧-51CTO.COM

打开 Visual Studio 2008在文件 (File) 菜单上，单击新建项目 (New Project)。在新建项目 (New Project) 对话框的模板 (Templates) 窗格中，单击 Windows 应用程序(Windows Application)。单击确定 (OK)

窗体应用技巧一，创建浮动窗体。

创建新工程后，选择Form1窗体，添加Timer1和Timer2控件。为窗体选择一个好看的背景，当然你也可以使用系统默认的背景。

进入代码编辑器，输入代码：

Public Class Form1
    Inherits System.Windows.Forms.Form  
Private Sub Form1_Load(ByVal sender As System.Object,

ByVal e As System.EventArgs) Handles MyBase.Load
Dim pos As Point = New Point(100, 50) '设置窗体初始位置
Me.DesktopLocation = pos
Timer1.Interval = 10 '设置Timer的值
Timer1.Enabled = True
Timer2.Interval = 10
Timer2.Enabled = False
    End Sub

进入Timer1_Tick事件

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs)

Handles Timer1.Tick
Dim pos As Point = New Point(Me.DesktopLocation.X + 2, Me.DesktopLocation.Y + 1)

'窗体左上方横坐标的timer1加
If pos.X < 600 Or pos.Y < 400 Then
Me.DesktopLocation = pos
Else
Timer1.Enabled = False
Timer2.Enabled = True
End If
    End Sub

进入Timer2_Tick事件

Private Sub Timer2_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs)

Handles Timer2.Tick

Dim pos As Point = New Point(Me.DesktopLocation.X - 2, Me.DesktopLocation.Y - 1)

'窗体的左上方横坐标随着timer2减一      

  If pos.X > 100 Or pos.Y > 50 Then
Me.DesktopLocation = pos
Else
Timer1.Enabled = True
Timer2.Enabled = False
End If
    End Sub

创建完成后我们来运行程序测试一下，测试成功，程序在屏幕中不断地来回走动了。

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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