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