DrawToolTipEventHandler Delegasikan
Definisi
Penting
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public delegate void DrawToolTipEventHandler(System::Object ^ sender, DrawToolTipEventArgs ^ e);public delegate void DrawToolTipEventHandler(object sender, DrawToolTipEventArgs e);public delegate void DrawToolTipEventHandler(object? sender, DrawToolTipEventArgs e);type DrawToolTipEventHandler = delegate of obj * DrawToolTipEventArgs -> unitPublic Delegate Sub DrawToolTipEventHandler(sender As Object, e As DrawToolTipEventArgs)Parameter
- sender
- Object
Sumber dari peristiwa tersebut.
DrawToolTipEventArgs yang berisi data peristiwa.
Contoh
Contoh kode berikut menunjukkan cara menggambar ToolTipkustom . Contoh membuat ToolTip dan mengaitkannya ke tiga Button kontrol yang terletak di Form. Contoh mengatur properti ke OwnerDraw true dan menangani Draw peristiwa. Dalam penanganan Draw aktivitas, ToolTip digambar khusus secara berbeda tergantung pada tombol ToolTip apa yang ditampilkan seperti yang ditunjukkan oleh DrawToolTipEventArgs.AssociatedControl properti .
#using <System.dll>
#using <System.Windows.Forms.dll>
#using <System.Drawing.dll>
using namespace System;
using namespace System::Drawing;
using namespace System::Windows::Forms;
using namespace System::Windows::Forms::VisualStyles;
// Form for the ToolTip example.
public ref class ToolTipExampleForm: public System::Windows::Forms::Form
{
private:
System::Windows::Forms::ToolTip^ toolTip1;
System::Windows::Forms::Button^ button1;
System::Windows::Forms::Button^ button2;
System::Windows::Forms::Button^ button3;
public:
ToolTipExampleForm()
{
// Create the ToolTip and set initial values.
this->toolTip1 = gcnew System::Windows::Forms::ToolTip;
this->toolTip1->AutoPopDelay = 5000;
this->toolTip1->InitialDelay = 500;
this->toolTip1->OwnerDraw = true;
this->toolTip1->ReshowDelay = 10;
this->toolTip1->Draw += gcnew DrawToolTipEventHandler( this, &ToolTipExampleForm::toolTip1_Draw );
// Create button1 and set initial values.
this->button1 = gcnew System::Windows::Forms::Button;
this->button1->Location = System::Drawing::Point( 8, 8 );
this->button1->Text = "Button 1";
this->toolTip1->SetToolTip( this->button1, "Button1 tip text" );
// Create button2 and set initial values.
this->button2 = gcnew System::Windows::Forms::Button;
this->button2->Location = System::Drawing::Point( 8, 32 );
this->button2->Text = "Button 2";
this->toolTip1->SetToolTip( this->button2, "Button2 tip text" );
// Create button3 and set initial values.
this->button3 = gcnew System::Windows::Forms::Button;
this->button3->Location = System::Drawing::Point( 8, 56 );
this->button3->Text = "Button 3";
this->toolTip1->SetToolTip( this->button3, "Button3 tip text" );
// Set up the Form.
array<Control^>^temp0 = {this->button1,this->button2,this->button3};
this->Controls->AddRange( temp0 );
this->Text = "owner drawn ToolTip example";
}
protected:
~ToolTipExampleForm()
{
if ( toolTip1 != nullptr )
{
delete toolTip1;
}
}
// Handles drawing the ToolTip.
private:
void toolTip1_Draw( System::Object^ /*sender*/, System::Windows::Forms::DrawToolTipEventArgs^ e )
{
// Draw the ToolTip differently depending on which
// control this ToolTip is for.
// Draw a custom 3D border if the ToolTip is for button1.
if ( e->AssociatedControl == button1 )
{
// Draw the standard background.
e->DrawBackground();
// Draw the custom border to appear 3-dimensional.
array<Point>^ temp1 = {Point(0,e->Bounds.Height - 1),Point(0,0),Point(e->Bounds.Width - 1,0)};
e->Graphics->DrawLines( SystemPens::ControlLightLight, temp1 );
array<Point>^ temp2 = {Point(0,e->Bounds.Height - 1),Point(e->Bounds.Width - 1,e->Bounds.Height - 1),Point(e->Bounds.Width - 1,0)};
e->Graphics->DrawLines( SystemPens::ControlDarkDark, temp2 );
// Specify custom text formatting flags.
TextFormatFlags sf = static_cast<TextFormatFlags>(TextFormatFlags::VerticalCenter | TextFormatFlags::HorizontalCenter | TextFormatFlags::NoFullWidthCharacterBreak);
// Draw the standard text with customized formatting options.
e->DrawText( sf );
}
// Draw a custom background and text if the ToolTip is for button2.
else
// Draw a custom background and text if the ToolTip is for button2.
if ( e->AssociatedControl == button2 )
{
// Draw the custom background.
e->Graphics->FillRectangle( SystemBrushes::ActiveCaption, e->Bounds );
// Draw the standard border.
e->DrawBorder();
// Draw the custom text.
// The using block will dispose the StringFormat automatically.
StringFormat^ sf = gcnew StringFormat;
try
{
sf->Alignment = StringAlignment::Center;
sf->LineAlignment = StringAlignment::Center;
sf->HotkeyPrefix = System::Drawing::Text::HotkeyPrefix::None;
sf->FormatFlags = StringFormatFlags::NoWrap;
System::Drawing::Font^ f = gcnew System::Drawing::Font( "Tahoma",9 );
try
{
e->Graphics->DrawString( e->ToolTipText, f, SystemBrushes::ActiveCaptionText, e->Bounds, sf );
}
finally
{
if ( f )
delete safe_cast<IDisposable^>(f);
}
}
finally
{
if ( sf )
delete safe_cast<IDisposable^>(sf);
}
}
// Draw the ToolTip using default values if the ToolTip is for button3.
else if ( e->AssociatedControl == button3 )
{
e->DrawBackground();
e->DrawBorder();
e->DrawText();
}
}
};
// The main entry point for the application.
[STAThread]
int main()
{
Application::Run( gcnew ToolTipExampleForm );
}
using System;
using System.Drawing;
using System.Windows.Forms;
using System.Windows.Forms.VisualStyles;
namespace ToolTipExample
{
// Form for the ToolTip example.
public class ToolTipExampleForm : System.Windows.Forms.Form
{
private System.Windows.Forms.ToolTip toolTip1;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.Button button3;
public ToolTipExampleForm()
{
// Create the ToolTip and set initial values.
this.toolTip1 = new System.Windows.Forms.ToolTip();
this.toolTip1.AutoPopDelay = 5000;
this.toolTip1.InitialDelay = 500;
this.toolTip1.OwnerDraw = true;
this.toolTip1.ReshowDelay = 10;
this.toolTip1.Draw += new DrawToolTipEventHandler(this.toolTip1_Draw);
this.toolTip1.Popup += new PopupEventHandler(toolTip1_Popup);
// Create button1 and set initial values.
this.button1 = new System.Windows.Forms.Button();
this.button1.Location = new System.Drawing.Point(8, 8);
this.button1.Text = "Button 1";
this.toolTip1.SetToolTip(this.button1, "Button1 tip text");
// Create button2 and set initial values.
this.button2 = new System.Windows.Forms.Button();
this.button2.Location = new System.Drawing.Point(8, 32);
this.button2.Text = "Button 2";
this.toolTip1.SetToolTip(this.button2, "Button2 tip text");
// Create button3 and set initial values.
this.button3 = new System.Windows.Forms.Button();
this.button3.Location = new System.Drawing.Point(8, 56);
this.button3.Text = "Button 3";
this.toolTip1.SetToolTip(this.button3, "Button3 tip text");
// Set up the Form.
this.Controls.AddRange(new Control[] {
this.button1, this.button2, this.button3
});
this.Text = "owner drawn ToolTip example";
}
// Clean up any resources being used.
protected override void Dispose(bool disposing)
{
if (disposing)
{
toolTip1.Dispose();
}
base.Dispose(disposing);
}
// The main entry point for the application.
[STAThread]
static void Main()
{
Application.Run(new ToolTipExampleForm());
}
// Determines the correct size for the button2 ToolTip.
private void toolTip1_Popup(object sender, PopupEventArgs e)
{
if (e.AssociatedControl == button2)
{
using (Font f = new Font("Tahoma", 9))
{
e.ToolTipSize = TextRenderer.MeasureText(
toolTip1.GetToolTip(e.AssociatedControl), f);
}
}
}
// Handles drawing the ToolTip.
private void toolTip1_Draw(System.Object sender,
System.Windows.Forms.DrawToolTipEventArgs e)
{
// Draw the ToolTip differently depending on which
// control this ToolTip is for.
// Draw a custom 3D border if the ToolTip is for button1.
if (e.AssociatedControl == button1)
{
// Draw the standard background.
e.DrawBackground();
// Draw the custom border to appear 3-dimensional.
e.Graphics.DrawLines(SystemPens.ControlLightLight, new Point[] {
new Point (0, e.Bounds.Height - 1),
new Point (0, 0),
new Point (e.Bounds.Width - 1, 0)
});
e.Graphics.DrawLines(SystemPens.ControlDarkDark, new Point[] {
new Point (0, e.Bounds.Height - 1),
new Point (e.Bounds.Width - 1, e.Bounds.Height - 1),
new Point (e.Bounds.Width - 1, 0)
});
// Specify custom text formatting flags.
TextFormatFlags sf = TextFormatFlags.VerticalCenter |
TextFormatFlags.HorizontalCenter |
TextFormatFlags.NoFullWidthCharacterBreak;
// Draw the standard text with customized formatting options.
e.DrawText(sf);
}
// Draw a custom background and text if the ToolTip is for button2.
else if (e.AssociatedControl == button2)
{
// Draw the custom background.
e.Graphics.FillRectangle(SystemBrushes.ActiveCaption, e.Bounds);
// Draw the standard border.
e.DrawBorder();
// Draw the custom text.
// The using block will dispose the StringFormat automatically.
using (StringFormat sf = new StringFormat())
{
sf.Alignment = StringAlignment.Center;
sf.LineAlignment = StringAlignment.Center;
sf.HotkeyPrefix = System.Drawing.Text.HotkeyPrefix.None;
sf.FormatFlags = StringFormatFlags.NoWrap;
using (Font f = new Font("Tahoma", 9))
{
e.Graphics.DrawString(e.ToolTipText, f,
SystemBrushes.ActiveCaptionText, e.Bounds, sf);
}
}
}
// Draw the ToolTip using default values if the ToolTip is for button3.
else if (e.AssociatedControl == button3)
{
e.DrawBackground();
e.DrawBorder();
e.DrawText();
}
}
}
}
Imports System.Drawing
Imports System.Windows.Forms
Imports System.Windows.Forms.VisualStyles
Public Module ToolTipExampleApp
' The main entry point for the application.
<STAThread()> _
Sub Main()
Application.Run(New ToolTipExampleForm)
End Sub
End Module
' Form for the ToolTip example.
Public Class ToolTipExampleForm
Inherits System.Windows.Forms.Form
Private WithEvents toolTip1 As System.Windows.Forms.ToolTip
Private WithEvents button1 As System.Windows.Forms.Button
Private WithEvents button2 As System.Windows.Forms.Button
Private WithEvents button3 As System.Windows.Forms.Button
Public Sub New()
' Create the ToolTip and set initial values.
Me.toolTip1 = New System.Windows.Forms.ToolTip
Me.toolTip1.AutoPopDelay = 5000
Me.toolTip1.InitialDelay = 500
Me.toolTip1.OwnerDraw = True
Me.toolTip1.ReshowDelay = 10
' Create button1 and set initial values.
Me.button1 = New System.Windows.Forms.Button
Me.button1.Location = New System.Drawing.Point(8, 8)
Me.button1.Text = "Button 1"
Me.toolTip1.SetToolTip(Me.button1, "Button1 tip text")
' Create button2 and set initial values.
Me.button2 = New System.Windows.Forms.Button
Me.button2.Location = New System.Drawing.Point(8, 32)
Me.button2.Text = "Button 2"
Me.toolTip1.SetToolTip(Me.button2, "Button2 tip text")
' Create button3 and set initial values.
Me.button3 = New System.Windows.Forms.Button
Me.button3.Location = New System.Drawing.Point(8, 56)
Me.button3.Text = "Button 3"
Me.toolTip1.SetToolTip(Me.button3, "Button3 tip text")
' Set up the Form.
Me.Controls.AddRange(New Control() {Me.button1, _
Me.button2, _
Me.button3})
Me.Text = "owner drawn ToolTip example"
End Sub
' Clean up any resources being used.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If (disposing) Then
toolTip1.Dispose()
End If
MyBase.Dispose(disposing)
End Sub
' Determines the correct size for the button2 ToolTip.
Private Sub toolTip1_Popup(ByVal sender As System.Object, _
ByVal e As PopupEventArgs) Handles toolTip1.Popup
If e.AssociatedControl Is button2 Then
Dim f As New Font("Tahoma", 9)
Try
e.ToolTipSize = TextRenderer.MeasureText( _
toolTip1.GetToolTip(e.AssociatedControl), f)
Finally
f.Dispose()
End Try
End If
End Sub
' Handles drawing the ToolTip.
Private Sub toolTip1_Draw(ByVal sender As System.Object, _
ByVal e As DrawToolTipEventArgs) Handles toolTip1.Draw
' Draw the ToolTip differently depending on which
' control this ToolTip is for.
' Draw a custom 3D border if the ToolTip is for button1.
If (e.AssociatedControl Is button1) Then
' Draw the standard background.
e.DrawBackground()
' Draw the custom border to appear 3-dimensional.
e.Graphics.DrawLines( _
SystemPens.ControlLightLight, New Point() { _
New Point(0, e.Bounds.Height - 1), _
New Point(0, 0), _
New Point(e.Bounds.Width - 1, 0)})
e.Graphics.DrawLines( _
SystemPens.ControlDarkDark, New Point() { _
New Point(0, e.Bounds.Height - 1), _
New Point(e.Bounds.Width - 1, e.Bounds.Height - 1), _
New Point(e.Bounds.Width - 1, 0)})
' Specify custom text formatting flags.
Dim sf As TextFormatFlags = TextFormatFlags.VerticalCenter Or _
TextFormatFlags.HorizontalCenter Or _
TextFormatFlags.NoFullWidthCharacterBreak
' Draw standard text with customized formatting options.
e.DrawText(sf)
ElseIf (e.AssociatedControl Is button2) Then
' Draw a custom background and text if the ToolTip is for button2.
' Draw the custom background.
e.Graphics.FillRectangle(SystemBrushes.ActiveCaption, e.Bounds)
' Draw the standard border.
e.DrawBorder()
' Draw the custom text.
Dim sf As StringFormat = New StringFormat
Try
sf.Alignment = StringAlignment.Center
sf.LineAlignment = StringAlignment.Center
sf.HotkeyPrefix = System.Drawing.Text.HotkeyPrefix.None
sf.FormatFlags = StringFormatFlags.NoWrap
Dim f As Font = New Font("Tahoma", 9)
Try
e.Graphics.DrawString(e.ToolTipText, f, _
SystemBrushes.ActiveCaptionText, _
RectangleF.op_Implicit(e.Bounds), sf)
Finally
f.Dispose()
End Try
Finally
sf.Dispose()
End Try
ElseIf (e.AssociatedControl Is button3) Then
' Draw the ToolTip using default values if the ToolTip is for button3.
e.DrawBackground()
e.DrawBorder()
e.DrawText()
End If
End Sub
End Class
Keterangan
Peristiwa ToolTip.Draw dinaikkan oleh ToolTip kelas ketika digambar ToolTip dan ToolTip.OwnerDraw nilai properti adalah true. Kelas DrawToolTipEventArgs berisi semua informasi yang diperlukan untuk melukis ToolTip, termasuk teks TipsAlat Rectangle, , dan Graphics objek tempat gambar harus dilakukan. Untuk mengkustomisasi tampilan TipsAlat, gunakan Rectangle untuk menentukan batas TipsAlat, dan Graphics objek untuk melakukan gambar yang disesuaikan. Anda dapat meningkatkan batas ToolTip sebelum ditampilkan dengan menangani Popup peristiwa.
Saat membuat DrawToolTipEventHandler delegasi, Anda mengidentifikasi metode yang akan menangani peristiwa. Untuk mengaitkan peristiwa dengan penanganan aktivitas Anda, tambahkan instans delegasi ke peristiwa. Penanganan aktivitas dipanggil setiap kali peristiwa terjadi, kecuali Anda menghapus delegasi. Untuk informasi selengkapnya tentang delegasi penanganan aktivitas, lihat Menangani dan Menaikkan Peristiwa.
Metode Ekstensi
| GetMethodInfo(Delegate) |
Mendapatkan objek yang mewakili metode yang diwakili oleh delegasi yang ditentukan. |
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