VB.Net/GUI/Form OnPaint
Содержание
Get Other Form Paint event
<source lang="vbnet"> Imports System Imports System.Drawing Imports System.Windows.Forms public class MainClass
Shared Sub Main() Dim form1 As Form = New Form1 Application.Run(form1) End Sub
End Class
Public Class Form1
Inherits System.Windows.Forms.Form
- Region " Windows Form Designer generated code "
Public Sub New() MyBase.New() "This call is required by the Windows Form Designer. InitializeComponent() "Add any initialization after the InitializeComponent() call End Sub "Form overrides dispose to clean up the component list. Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean) If disposing Then If Not (components Is Nothing) Then components.Dispose() End If End If MyBase.Dispose(disposing) End Sub Friend WithEvents cmdDrawStuff As System.Windows.Forms.Button Friend WithEvents cmdInvalidate As System.Windows.Forms.Button Friend WithEvents cmdOtherForm As System.Windows.Forms.Button "Required by the Windows Form Designer Private components As System.ruponentModel.IContainer "NOTE: The following procedure is required by the Windows Form Designer "It can be modified using the Windows Form Designer. "Do not modify it using the code editor. <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() Me.cmdOtherForm = New System.Windows.Forms.Button() Me.cmdDrawStuff = New System.Windows.Forms.Button() Me.cmdInvalidate = New System.Windows.Forms.Button() Me.SuspendLayout() " "cmdOtherForm " Me.cmdOtherForm.Location = New System.Drawing.Point(184, 136) Me.cmdOtherForm.Name = "cmdOtherForm" Me.cmdOtherForm.Size = New System.Drawing.Size(96, 32) Me.cmdOtherForm.TabIndex = 2 Me.cmdOtherForm.Text = "Other Form" " "cmdDrawStuff " Me.cmdDrawStuff.Location = New System.Drawing.Point(184, 80) Me.cmdDrawStuff.Name = "cmdDrawStuff" Me.cmdDrawStuff.Size = New System.Drawing.Size(96, 32) Me.cmdDrawStuff.TabIndex = 1 Me.cmdDrawStuff.Text = "Draw Stuff" " "cmdInvalidate " Me.cmdInvalidate.Location = New System.Drawing.Point(184, 24) Me.cmdInvalidate.Name = "cmdInvalidate" Me.cmdInvalidate.Size = New System.Drawing.Size(96, 32) Me.cmdInvalidate.TabIndex = 0 Me.cmdInvalidate.Text = "Invalidate" " "Form1 " Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13) Me.ClientSize = New System.Drawing.Size(292, 273) Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.cmdOtherForm, Me.cmdDrawStuff, Me.cmdInvalidate}) Me.Name = "Form1" Me.Text = "Form1" Me.ResumeLayout(False) End Sub
- End Region
Private Sub OtherFormPaint(ByVal sender As Object, ByVal args As PaintEventArgs) Console.WriteLine("Other paint arrived") End Sub Private Sub cmdOtherForm_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdOtherForm.Click Dim f As New Form1() f.Visible = True AddHandler f.Paint, AddressOf Me.OtherFormPaint End Sub
End Class
</source>
Override Form OnPaint and OnResize Method
<source lang="vbnet"> Imports System Imports System.Drawing Imports System.Windows.Forms public class MainClass
Shared Sub Main() Dim form1 As Form = New Form1 Application.Run(form1) End Sub
End Class
Public Class Form1
Inherits System.Windows.Forms.Form
- Region " Windows Form Designer generated code "
Public Sub New() MyBase.New() "This call is required by the Windows Form Designer. InitializeComponent() "Add any initialization after the InitializeComponent() call End Sub "Form overrides dispose to clean up the component list. Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean) If disposing Then If Not (components Is Nothing) Then components.Dispose() End If End If MyBase.Dispose(disposing) End Sub Friend WithEvents cmdDrawStuff As System.Windows.Forms.Button Friend WithEvents cmdInvalidate As System.Windows.Forms.Button Friend WithEvents cmdOtherForm As System.Windows.Forms.Button "Required by the Windows Form Designer Private components As System.ruponentModel.IContainer "NOTE: The following procedure is required by the Windows Form Designer "It can be modified using the Windows Form Designer. "Do not modify it using the code editor. <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() Me.cmdOtherForm = New System.Windows.Forms.Button() Me.cmdDrawStuff = New System.Windows.Forms.Button() Me.cmdInvalidate = New System.Windows.Forms.Button() Me.SuspendLayout() " "cmdOtherForm " Me.cmdOtherForm.Location = New System.Drawing.Point(184, 136) Me.cmdOtherForm.Name = "cmdOtherForm" Me.cmdOtherForm.Size = New System.Drawing.Size(96, 32) Me.cmdOtherForm.TabIndex = 2 Me.cmdOtherForm.Text = "Other Form" " "cmdDrawStuff " Me.cmdDrawStuff.Location = New System.Drawing.Point(184, 80) Me.cmdDrawStuff.Name = "cmdDrawStuff" Me.cmdDrawStuff.Size = New System.Drawing.Size(96, 32) Me.cmdDrawStuff.TabIndex = 1 Me.cmdDrawStuff.Text = "Draw Stuff" " "cmdInvalidate " Me.cmdInvalidate.Location = New System.Drawing.Point(184, 24) Me.cmdInvalidate.Name = "cmdInvalidate" Me.cmdInvalidate.Size = New System.Drawing.Size(96, 32) Me.cmdInvalidate.TabIndex = 0 Me.cmdInvalidate.Text = "Invalidate" " "Form1 " Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13) Me.ClientSize = New System.Drawing.Size(292, 273) Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.cmdOtherForm, Me.cmdDrawStuff, Me.cmdInvalidate}) Me.Name = "Form1" Me.Text = "Form1" Me.ResumeLayout(False) End Sub
- End Region
Dim backgroundbitmap As Bitmap Protected Overrides Sub OnResize(ByVal e As System.EventArgs) If Not Me.ClientRectangle.IsEmpty Then If Not Me.ClientSize.Equals(New Size(backgroundbitmap.Width, backgroundbitmap.Height)) Then Dim newbitmap As Bitmap newbitmap = New Bitmap(Me.ClientSize.Width, Me.ClientSize.Height) If Not backgroundbitmap Is Nothing Then Dim g As Graphics = graphics.FromImage(newbitmap) g.DrawImage(backgroundbitmap, 0, 0) End If backgroundbitmap = newbitmap End If End If End Sub Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs)
" MyBase.OnPaint(e)
e.Graphics.DrawLine(pens.Black, 0, 0, 200, 200) e.Graphics.DrawLine(pens.Red, 0, 200, 200, 0) "RaiseEvent Paint(Me, e) End Sub
End Class
</source>
Paint Bitmap on a form using the Paint Method
<source lang="vbnet"> Imports System Imports System.Collections Imports System.Data Imports System.IO Imports System.Xml.Serialization Imports System.Windows.Forms Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Drawing.Text Imports System.Drawing.Printing
Public Class MainClass
Shared Sub Main() Dim form1 As Form = New Form1() Application.Run(form1) End Sub
End Class
Public Class Form1
Inherits System.Windows.Forms.Form
- Region " Windows Form Designer generated code "
Public Sub New() MyBase.New() "This call is required by the Windows Form Designer. InitializeComponent() "Add any initialization after the InitializeComponent() call End Sub "Form overrides dispose to clean up the component list. Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean) If disposing Then If Not (components Is Nothing) Then components.Dispose() End If End If MyBase.Dispose(disposing) End Sub "Required by the Windows Form Designer Private components As System.ruponentModel.Container "NOTE: The following procedure is required by the Windows Form Designer "It can be modified using the Windows Form Designer. "Do not modify it using the code editor. <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() " "Form1 " Me.AutoScaleBaseSize = New System.Drawing.Size(6, 15) Me.ClientSize = New System.Drawing.Size(336, 268) Me.Name = "Form1" Me.Text = "The simplest drawing program" End Sub
- End Region
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load End Sub Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs) MyBase.OnPaint(e) Dim g As Graphics g = e.Graphics() g.DrawImage(New Bitmap("figure2.bmp"), 0, 0) End Sub
End Class
</source>
To call MyBase.OnPaint(e) or not to call
<source lang="vbnet"> Imports System Imports System.Drawing Imports System.Windows.Forms public class MainClass
Shared Sub Main() Dim form1 As Form = New Form1 Application.Run(form1) End Sub
End Class
Public Class Form1
Inherits System.Windows.Forms.Form
- Region " Windows Form Designer generated code "
Public Sub New() MyBase.New() "This call is required by the Windows Form Designer. InitializeComponent() "Add any initialization after the InitializeComponent() call End Sub "Form overrides dispose to clean up the component list. Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean) If disposing Then If Not (components Is Nothing) Then components.Dispose() End If End If MyBase.Dispose(disposing) End Sub Friend WithEvents cmdDrawStuff As System.Windows.Forms.Button Friend WithEvents cmdInvalidate As System.Windows.Forms.Button Friend WithEvents cmdOtherForm As System.Windows.Forms.Button "Required by the Windows Form Designer Private components As System.ruponentModel.IContainer "NOTE: The following procedure is required by the Windows Form Designer "It can be modified using the Windows Form Designer. "Do not modify it using the code editor. <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() Me.cmdOtherForm = New System.Windows.Forms.Button() Me.cmdDrawStuff = New System.Windows.Forms.Button() Me.cmdInvalidate = New System.Windows.Forms.Button() Me.SuspendLayout() " "cmdOtherForm " Me.cmdOtherForm.Location = New System.Drawing.Point(184, 136) Me.cmdOtherForm.Name = "cmdOtherForm" Me.cmdOtherForm.Size = New System.Drawing.Size(96, 32) Me.cmdOtherForm.TabIndex = 2 Me.cmdOtherForm.Text = "Other Form" " "cmdDrawStuff " Me.cmdDrawStuff.Location = New System.Drawing.Point(184, 80) Me.cmdDrawStuff.Name = "cmdDrawStuff" Me.cmdDrawStuff.Size = New System.Drawing.Size(96, 32) Me.cmdDrawStuff.TabIndex = 1 Me.cmdDrawStuff.Text = "Draw Stuff" " "cmdInvalidate " Me.cmdInvalidate.Location = New System.Drawing.Point(184, 24) Me.cmdInvalidate.Name = "cmdInvalidate" Me.cmdInvalidate.Size = New System.Drawing.Size(96, 32) Me.cmdInvalidate.TabIndex = 0 Me.cmdInvalidate.Text = "Invalidate" " "Form1 " Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13) Me.ClientSize = New System.Drawing.Size(292, 273) Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.cmdOtherForm, Me.cmdDrawStuff, Me.cmdInvalidate}) Me.Name = "Form1" Me.Text = "Form1" Me.ResumeLayout(False) End Sub
- End Region
Dim backgroundbitmap As Bitmap Protected Overrides Sub OnResize(ByVal e As System.EventArgs) If Not Me.ClientRectangle.IsEmpty Then If Not Me.ClientSize.Equals(New Size(backgroundbitmap.Width, backgroundbitmap.Height)) Then Dim newbitmap As Bitmap newbitmap = New Bitmap(Me.ClientSize.Width, Me.ClientSize.Height) If Not backgroundbitmap Is Nothing Then Dim g As Graphics = graphics.FromImage(newbitmap) g.DrawImage(backgroundbitmap, 0, 0) End If backgroundbitmap = newbitmap End If End If End Sub Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs)
" MyBase.OnPaint(e)
e.Graphics.DrawLine(pens.Black, 0, 0, 200, 200) e.Graphics.DrawLine(pens.Red, 0, 200, 200, 0) "RaiseEvent Paint(Me, e) End Sub
End Class
</source>