DrawToolTipEventArgs 类

参考

定义

命名空间:: System.Windows.Forms

程序集:: System.Windows.Forms.dll

重要

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为 Draw 事件提供数据。

public ref class DrawToolTipEventArgs : EventArgs

public class DrawToolTipEventArgs : EventArgs

type DrawToolTipEventArgs = class
    inherit EventArgs

Public Class DrawToolTipEventArgs
Inherits EventArgs

继承: Object

EventArgs
DrawToolTipEventArgs

示例

下面的代码示例演示如何自定义绘制 ToolTip。该示例创建，并将其关联到位于上的Form三Button个ToolTip控件。该示例将 OwnerDraw 属性设置为 true 并处理 Draw 事件。在事件处理程序中 Draw ， ToolTip 根据显示的按钮 ToolTip ，以不同的方式自定义绘制，如属性所示 DrawToolTipEventArgs.AssociatedControl 。

#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

注解

当 ToolTip.Draw 绘制时， ToolTip 类 ToolTip 将引发事件， ToolTip.OwnerDraw 并且属性值为 true。此事件的处理程序接收类型的 DrawToolTipEventArgs参数。 DrawToolTipEventArgs类包含绘制 ToolTip所需的所有信息，包括ToolTip文本、Rectangle、和Graphics应对其执行绘图的对象。若要自定义工具提示的外观，请使用 Rectangle 确定工具提示的边界，并使用 Graphics 对象执行自定义绘图。通过处理 Popup 事件，ToolTip可以在显示之前增加的边界。

DrawToolTipEventArgs 还支持通过 DrawBackground、 DrawText 和 DrawBorder 方法进行部分自定义。使用这些方法，可以拥有工具提示的绘制部分，同时保留以标准方式绘制的其他部分。

构造函数

DrawToolTipEventArgs(Graphics, IWin32Window, Control, Rectangle, String, Color, Color, Font)

初始化 DrawToolTipEventArgs 类的新实例。

属性

AssociatedControl	获取要为其绘制 ToolTip 的控件。
AssociatedWindow	获取此 ToolTip 要绑定到的窗口。
Bounds	获取要绘制的 ToolTip 的大小和位置。
Font	获取用于绘制 ToolTip 的字体。
Graphics	获取用于绘制 ToolTip 的图形图面。
ToolTipText	获取正在绘制的 ToolTip 的文本。

方法

DrawBackground()	使用系统背景色绘制 ToolTip 的背景。
DrawBorder()	使用系统边框颜色绘制 ToolTip 的边框。
DrawText()	使用系统文本颜色和字体绘制 ToolTip 的文本。
DrawText(TextFormatFlags)	使用系统文本颜色和字体以及指定的文本布局绘制 ToolTip 的文本。
Equals(Object)	确定指定对象是否等于当前对象。 (继承自 Object)
GetHashCode()	作为默认哈希函数。 (继承自 Object)
GetType()	获取当前实例的 Type。 (继承自 Object)
MemberwiseClone()	创建当前 Object 的浅表副本。 (继承自 Object)
ToString()	返回表示当前对象的字符串。 (继承自 Object)

适用于

通过

DrawToolTipEventArgs 类

定义

示例

注解

构造函数

属性

方法

适用于

另请参阅

其他资源