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>
