按钮|控件
Imports System.Drawing
Imports System.ComponentModel
Public Class winxpbutton
Inherits System.Windows.Forms.Button
Private my_mouseDown As Boolean = False '鼠标按下
Private my_mouseHover As Boolean = False '鼠标移到上面
Private m_textcolor As Color = System.Drawing.Color.Black '字体颜色
<Description("字体颜色。")> _
Public Property textcolor() As Color
Get
Return m_textcolor
End Get
Set(ByVal Value As Color)
m_textcolor = Value
Me.Invalidate()
End Set
End Property
Public Sub New()
MyBase.New()
'该调用是 Windows 窗体设计器所必需的。
InitializeComponent()
'在 InitializeComponent() 调用之后添加任何初始化,true表示将指定的样式应用到控件
'设置控件样式位能够充分地更改控件行为
Me.SetStyle(ControlStyles.UserPaint, True)
'关联事件委托
AddHandler Me.MouseDown, AddressOf my_OnMouseDown
AddHandler Me.MouseUp, AddressOf my_OnMouseUp
AddHandler Me.MouseEnter, AddressOf my_OnMouseEnter
AddHandler Me.MouseLeave, AddressOf my_OnMouseLeave
Height = 23
Width = 75
End Sub
Protected Overrides Sub OnPaint(ByVal pevent As System.Windows.Forms.PaintEventArgs)
'pevent.ClipRectangle指在其中绘制的矩形,即使用父控件的背景色来画这个矩形按钮
pevent.Graphics.FillRectangle(New SolidBrush(Me.Parent.BackColor), pevent.ClipRectangle)
If (Enabled = False) Then
'画不可用状态
DrawDisableButton(pevent.Graphics)
ElseIf (my_mouseDown) Then '画鼠标按下状态
DrawMouseDownButton(pevent.Graphics)
ElseIf (my_mouseHover) Then '画鼠标移动到其上状态
DrawMouseHoverButton(pevent.Graphics)
ElseIf (Focused) Then '有焦点，但鼠标未移动到其上
DrawContainFocusButton(pevent.Graphics)
Else '一般情况下
DrawNormalButton(pevent.Graphics)
End If
'写文本
WriteText(pevent.Graphics)
End Sub
'鼠标按下的状态处理
Private Sub my_OnMouseDown(ByVal sender As Object, ByVal e As MouseEventArgs)
my_mouseDown = True '鼠标按下
End Sub
'鼠标松开状态的处理
Private Sub my_OnMouseUp(ByVal sender As Object, ByVal e As MouseEventArgs)
my_mouseDown = False '鼠标松开
'重新绘制控件时发生 Paint 事件。PaintEventArgs 指定绘制控件所用的 Graphics
'以及绘制控件所在的 ClipRectangle。
Dim pe As PaintEventArgs = New PaintEventArgs(CreateGraphics(), ClientRectangle)
OnPaint(pe)
End Sub
'鼠标进入
Private Sub my_OnMouseEnter(ByVal sender As Object, ByVal e As EventArgs)
my_mouseHover = True '鼠标移动到其上
'
Dim pe As PaintEventArgs = New PaintEventArgs(CreateGraphics(), ClientRectangle)
OnPaint(pe)
End Sub
'鼠标移动开
Private Sub my_OnMouseLeave(ByVal sender As Object, ByVal e As EventArgs)
my_mouseHover = False '鼠标移动开
'
Dim pe As PaintEventArgs = New PaintEventArgs(CreateGraphics(), ClientRectangle)
OnPaint(pe)
End Sub
Private Sub DrawBorder(ByVal g As Graphics, ByVal state As Integer)
If (state = 1) Then '绘制一般边框
'绘制一个画笔，高光点，宽度2
Dim p As Pen = New Pen(SystemColors.ControlLightLight, 2)
'g.DrawLine画线，p是画笔，后面是第一个点的坐标，第二个点的坐标
g.DrawLine(p, 1, 1, 1, Height - 2) '绘制左侧竖线
g.DrawLine(p, 1, 1, Width - 2, 1) '绘制上面横线
g.DrawLine(p, Width - 1, 2, Width - 1, Height - 2) '绘制右侧竖线，由于已经在上面绘制了横线（纵坐标为1），所以从2开始
g.DrawLine(p, 2, Height - 1, Width - 2, Height - 1) '绘制下面横线
ElseIf (state = 2) Then '绘制移动到其上的边框
'与一般边框用高光区别的是显示黄色
Dim p As Pen = New Pen(Color.Yellow, 2)
g.DrawLine(p, 1, 1, 1, Height - 2)
g.DrawLine(p, 1, 1, Width - 2, 1)
g.DrawLine(p, Width - 1, 2, Width - 1, Height - 2)
g.DrawLine(p, 2, Height - 1, Width - 2, Height - 1)
ElseIf (state = 3) Then '绘制按下的显示边框
'与一般边框用高光区别的是显示暗褐色
Dim p As Pen = New Pen(SystemColors.ControlDark, 2)
g.DrawLine(p, 1, 1, 1, Height - 2)
g.DrawLine(p, 1, 1, Width - 2, 1)
g.DrawLine(p, Width - 1, 2, Width - 1, Height - 2)
g.DrawLine(p, 2, Height - 1, Width - 2, Height - 1)
ElseIf (state = 4) Then '绘制不可用状态边框
'与一般边框用高光区别的是显示亮色
Dim p As Pen = New Pen(SystemColors.ControlLight, 2)
g.DrawLine(p, 1, 1, 1, Height - 2)
g.DrawLine(p, 1, 1, Width - 2, 1)
g.DrawLine(p, Width - 1, 2, Width - 1, Height - 2)
g.DrawLine(p, 2, Height - 1, Width - 2, Height - 1)
ElseIf (state = 5) Then '绘制有焦点但鼠标不在其上的状态
'与一般边框用高光区别的是显示兰色
Dim p As Pen = New Pen(Color.SkyBlue, 2)
g.DrawLine(p, 1, 1, 1, Height - 2)
g.DrawLine(p, 1, 1, Width - 2, 1)
g.DrawLine(p, Width - 1, 2, Width - 1, Height - 2)
g.DrawLine(p, 2, Height - 1, Width - 2, Height - 1)
End If
'//做完如上的处理后再对可用和不可用做圆化边缘处理（也就是把按钮的4个角进行圆化处理）
If (state = 4) Then '不可用时
'使用画笔，Color.FromArgb(161, 161, 146)是从一个32位的ARGB值创建系统颜色，宽度为1
Dim p As Pen = New Pen(Color.FromArgb(161, 161, 146), 1)
g.DrawLine(p, 0, 2, 0, Height - 3) '左侧竖线（除了两个边角剩下的线）
g.DrawLine(p, 2, 0, Width - 3, 0) '上面横线（除了两个边角剩下的线）
g.DrawLine(p, Width - 1, 2, Width - 1, Height - 3) '右侧竖线（除了两个边角剩下的线）
g.DrawLine(p, 2, Height - 1, Width - 3, Height - 1) '下面的横线
g.DrawLine(p, 0, 2, 2, 0) '左上角
g.DrawLine(p, 0, Height - 3, 2, Height - 1) '左下角
g.DrawLine(p, Width - 3, 0, Width - 1, 2) '右上角
g.DrawLine(p, Width - 3, Height - 1, Width - 1, Height - 3) '右下角
Else 'draw normal style border
'采用默认的黑色进行绘制边角
g.DrawLine(Pens.Black, 0, 2, 0, Height - 3)
g.DrawLine(Pens.Black, 2, 0, Width - 3, 0)
g.DrawLine(Pens.Black, Width - 1, 2, Width - 1, Height - 3)
g.DrawLine(Pens.Black, 2, Height - 1, Width - 3, Height - 1)
g.DrawLine(Pens.Black, 0, 2, 2, 0)
g.DrawLine(Pens.Black, 0, Height - 3, 2, Height - 1)
g.DrawLine(Pens.Black, Width - 3, 0, Width - 1, 2)
g.DrawLine(Pens.Black, Width - 3, Height - 1, Width - 1, Height - 3)
End If
End Sub
'一般状态
Private Sub DrawNormalButton(ByVal g As Graphics)
'绘制边框，宽度为1
DrawBorder(g, 1)
'绘制背景，用高光点颜色
PaintBack(g, SystemColors.ControlLightLight)
End Sub
'鼠标移动到其上的状态
Private Sub DrawMouseHoverButton(ByVal g As Graphics)
DrawBorder(g, 2)
PaintBack(g, SystemColors.ControlLightLight)
End Sub
Private Sub DrawMouseDownButton(ByVal g As Graphics)
DrawBorder(g, 3)
'绘制背景，用三维元素的亮色
PaintBack(g, SystemColors.ControlLight)
End Sub
Private Sub DrawDisableButton(ByVal g As Graphics)
DrawBorder(g, 4)
'亮色
PaintBack(g, SystemColors.ControlLight)
End Sub
Private Sub DrawContainFocusButton(ByVal g As Graphics)
DrawBorder(g, 5)
'高光点
PaintBack(g, SystemColors.ControlLightLight)
End Sub
'绘制背景色
Private Sub PaintBack(ByVal g As Graphics, ByVal c As Color)
'填充时采用：单色画刷，相对与（0，0）坐标（3，3）的位置，大小为宽-6，高-6
g.FillRectangle(New SolidBrush(c), 3, 3, Width - 6, Height - 6)
End Sub
'写文本
Private Sub WriteText(ByVal g As Graphics)
'计算文本的位置
Dim x As Integer = 0
Dim y As Integer = 0
'size用宽高有序对表示矩形区域
Dim s As Size = g.MeasureString(Text, Font).ToSize()
x = (Width - s.Width) / 2 '文字相对控件x偏移
y = (Height - s.Height) / 2 '文字相对控件y偏移
'写文本
If (Enabled) Then '如果控件可用，则黑色文字
'g.DrawString(Text, Font, Brushes.Black, x, y)
Dim b As New SolidBrush(m_textcolor)
g.DrawString(Text, Font, b, x, y)
Else '如果控件不可用，则灰色文字
g.DrawString(Text, Font, Brushes.Gray, x, y)
End If
End Sub
End Class