DrawToolTipEventHandler デリゲートとは何？わかりやすく解説 Weblio辞書

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.NET Framework クラスライブラリリファレンス

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DrawToolTipEventHandler デリゲート

メモ : このデリゲートは、.NET Framework version 2.0 で新しく追加されたものです。

ToolTip の Draw イベントを処理するメソッドを表します。

名前空間: System.Windows.Forms
アセンブリ: System.Windows.Forms (system.windows.forms.dll 内)
構文

Visual Basic (宣言)

Public Delegate Sub DrawToolTipEventHandler
 ( _
    sender As Object, _
    e As DrawToolTipEventArgs _
)

Visual Basic (使用法)

Dim instance As New DrawToolTipEventHandler(AddressOf
 HandlerMethod)

public delegate void DrawToolTipEventHandler
 (
    Object sender,
    DrawToolTipEventArgs e
)

C++

public delegate void DrawToolTipEventHandler
 (
    Object^ sender, 
    DrawToolTipEventArgs^ e
)

/** @delegate */
public delegate void DrawToolTipEventHandler
 (
    Object sender, 
    DrawToolTipEventArgs e
)

JScript

JScript では、デリゲートは使用できますが、新規に宣言することはできません。

パラメータ

sender: イベントのソース。

e: イベントデータを格納している DrawToolTipEventArgs。

解説

ToolTip.Draw イベントは、ToolTip が描画され、ToolTip.OwnerDraw プロパティの値が true に設定されているときに、ToolTip クラスが発生させます。DrawToolTipEventArgs クラスには、ToolTip の描画に必要なすべての情報 (ツールヒントテキスト、Rectangle、描画を実行するときに使用する Graphics オブジェクトなど) が格納されています。ツールヒントの外観をカスタマイズするには、Rectangle を使用してツールヒントの境界を決定し、Graphics オブジェクトを使用してカスタム描画を実行します。Popup イベントを処理することで、ToolTip の表示前に、その境界を拡大できます。

DrawToolTipEventHandler デリゲートを作成する場合は、イベントを処理するメソッドを識別してください。イベントをイベントハンドラに関連付けるには、デリゲートのインスタンスをイベントに追加します。デリゲートを削除しない限り、そのイベントが発生すると常にイベントハンドラが呼び出されます。イベントハンドラデリゲートの詳細については、「イベントとデリゲート」を参照してください。

使用例

ToolTip をカスタム描画する方法を次のコード例に示します。この例では、ToolTip を作成し、Form 上にある 3 つの Button コントロールに関連付けています。また、OwnerDraw プロパティを true に設定し、Draw イベントを処理しています。Draw のイベントハンドラでは、ToolTip が表示されるボタン (DrawToolTipEventArgs.AssociatedControl プロパティで指定) に応じて、さまざまな方法で ToolTip がカスタム描画されます。

Visual Basic

Imports System
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

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();
            }
        }
    }
}

C++

#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 );
}

package ToolTipExample;

import System.*;
import System.Drawing.*;
import System.Drawing.GDI.*;
import System.Windows.Forms.*;
import System.Windows.Forms.VisualStyles.*;

// Form for the ToolTip example.
public class ToolTipExampleForm extends 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.set_AutoPopDelay(5000);
        this.toolTip1.set_InitialDelay(500);
        this.toolTip1.set_OwnerDraw(true);
        this.toolTip1.set_ReshowDelay(10);
        this.toolTip1.add_Draw(new DrawToolTipEventHandler(this.toolTip1_Draw));
        // Create button1 and set initial values.
        this.button1 = new System.Windows.Forms.Button();
        this.button1.set_Location(new System.Drawing.Point(8,
 8));
        this.button1.set_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.set_Location(new System.Drawing.Point(8,
 32));
        this.button2.set_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.set_Location(new System.Drawing.Point(8,
 56));
        this.button3.set_Text("Button 3");
        this.toolTip1.SetToolTip(this.button3,
 "Button3 tip text");
        // Set up the Form.
        this.get_Controls().AddRange(new Control[]
            { this.button1, this.button2, this.button3
 });
        this.set_Text("owner drawn ToolTip example");
    } //ToolTipExampleForm

    // Clean up any resources being used.        
    protected void Dispose(boolean disposing)
    {
        if (disposing) {
            toolTip1.Dispose();
        }
        super.Dispose(disposing);
    } //Dispose

    // The main entry point for the application.
    /** @attribute STAThread()
     */
    public static void main(String[]
 args)
    {
        Application.Run(new ToolTipExampleForm());
    } //main

    // Handles drawing the ToolTip.
    private void toolTip1_Draw(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.get_AssociatedControl().Equals(button1)) {
            // Draw the standard background.
            e.DrawBackground();
            // Draw the custom border to appear 3-dimensional.
            e.get_Graphics().DrawLines(SystemPens.get_ControlLightLight(),
                new Point[] { new Point(0,
 e.get_Bounds().get_Height() - 1),
                new Point(0, 0), new Point(e.get_Bounds().get_Width()
 - 1, 0)});
            e.get_Graphics().DrawLines(SystemPens.get_ControlDarkDark(),
                new Point[] { new Point(0,
 e.get_Bounds().get_Height() - 1),
                new Point(e.get_Bounds().get_Width() - 1,
                e.get_Bounds().get_Height() - 1),
                new Point(e.get_Bounds().get_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.get_AssociatedControl().Equals(button2)) {
                // Draw the custom background.
                e.get_Graphics().FillRectangle(SystemBrushes.get_ActiveCaption()
,
                    e.get_Bounds());
                // Draw the standard border.
                e.DrawBorder();
                
                // Draw the custom text.
                // The using block will dispose the StringFormat automatically.
                StringFormat sf = new StringFormat();
                try {
                    sf.set_Alignment(StringAlignment.Center);
                    sf.set_LineAlignment(StringAlignment.Center);
                    sf.set_HotkeyPrefix(System.Drawing.Text.HotkeyPrefix.None);
                    sf.set_FormatFlags(StringFormatFlags.NoWrap);               
     
                    Font f = new Font("Tahoma", 9);
                    try {
                        e.get_Graphics().DrawString(e.get_ToolTipText(), f,
                            SystemBrushes.get_ActiveCaptionText(),
                            RectangleF.op_Implicit(e.get_Bounds()), sf);
                    }
                    finally {
                        f.Dispose();
                    }                    
                }
                finally {
                    sf.Dispose();
                }                
            }
            // Draw the ToolTip using default values if the ToolTip
 is
            // for button3.
            else {
                if (e.get_AssociatedControl().Equals(button3))
 {
                    e.DrawBackground();
                    e.DrawBorder();
                    e.DrawText();
                }
            }
        }        
    } //toolTip1_Draw
} //ToolTipExampleForm

プラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0

参照

関連項目
System.Windows.Forms 名前空間

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DrawToolTipEventHandler デリゲートとは？ わかりやすく解説

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DrawToolTipEventHandler デリゲートとは？わかりやすく解説