从面板的绘制形状调整窗体大小是指在VB.NET中通过绘制面板的形状来实现调整窗体大小的功能。这种方法可以通过自定义绘制面板的形状来实现窗体的非矩形形状,从而实现窗体的自由调整大小。
在VB.NET中,可以通过以下步骤来实现从面板的绘制形状调整窗体大小的功能:
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Me.FormBorderStyle = FormBorderStyle.None ' 设置窗体边框为无
Me.DoubleBuffered = True ' 启用双缓冲,减少闪烁
Me.SetStyle(ControlStyles.ResizeRedraw, True) ' 启用重绘
End Sub
Private Const HTLEFT As Integer = 10 ' 左边界
Private Const HTRIGHT As Integer = 11 ' 右边界
Private Const HTTOP As Integer = 12 ' 上边界
Private Const HTTOPLEFT As Integer = 13 ' 左上角
Private Const HTTOPRIGHT As Integer = 14 ' 右上角
Private Const HTBOTTOM As Integer = 15 ' 下边界
Private Const HTBOTTOMLEFT As Integer = 16 ' 左下角
Private Const HTBOTTOMRIGHT As Integer = 17 ' 右下角
Private Sub Form1_MouseDown(sender As Object, e As MouseEventArgs) Handles MyBase.MouseDown
If e.Button = MouseButtons.Left Then
ReleaseCapture()
Dim msg As Message = Message.Create(Me.Handle, &HA1, New IntPtr(2), IntPtr.Zero)
Me.DefWndProc(msg)
End If
End Sub
Private Sub Form1_MouseMove(sender As Object, e As MouseEventArgs) Handles MyBase.MouseMove
If e.Button = MouseButtons.Left Then
Dim cursorPos As Point = Me.PointToClient(Cursor.Position)
If cursorPos.X < 5 AndAlso cursorPos.Y < 5 Then
Me.Cursor = Cursors.SizeNWSE ' 左上角
Return
ElseIf cursorPos.X > Me.Width - 5 AndAlso cursorPos.Y < 5 Then
Me.Cursor = Cursors.SizeNESW ' 右上角
Return
ElseIf cursorPos.X < 5 AndAlso cursorPos.Y > Me.Height - 5 Then
Me.Cursor = Cursors.SizeNESW ' 左下角
Return
ElseIf cursorPos.X > Me.Width - 5 AndAlso cursorPos.Y > Me.Height - 5 Then
Me.Cursor = Cursors.SizeNWSE ' 右下角
Return
ElseIf cursorPos.X < 5 Then
Me.Cursor = Cursors.SizeWE ' 左边界
Return
ElseIf cursorPos.X > Me.Width - 5 Then
Me.Cursor = Cursors.SizeWE ' 右边界
Return
ElseIf cursorPos.Y < 5 Then
Me.Cursor = Cursors.SizeNS ' 上边界
Return
ElseIf cursorPos.Y > Me.Height - 5 Then
Me.Cursor = Cursors.SizeNS ' 下边界
Return
Else
Me.Cursor = Cursors.Default
End If
End If
End Sub
Private Sub Form1_MouseUp(sender As Object, e As MouseEventArgs) Handles MyBase.MouseUp
Me.Cursor = Cursors.Default
End Sub
Private Sub Form1_Paint(sender As Object, e As PaintEventArgs) Handles MyBase.Paint
Dim path As New Drawing2D.GraphicsPath()
path.AddEllipse(0, 0, Me.Width, Me.Height) ' 绘制椭圆形状
Me.Region = New Region(path) ' 设置窗体的区域为椭圆形状
End Sub
通过以上步骤,就可以实现在VB.NET中通过绘制面板的形状来调整窗体大小的功能。这种方法可以用于创建具有自定义形状的窗体,增加窗体的美观性和用户体验。
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