ToolTip.Draw Evento
Definición
Importante
Parte de la información hace referencia a la versión preliminar del producto, que puede haberse modificado sustancialmente antes de lanzar la versión definitiva. Microsoft no otorga ninguna garantía, explícita o implícita, con respecto a la información proporcionada aquí.
public:
event System::Windows::Forms::DrawToolTipEventHandler ^ Draw;public event System.Windows.Forms.DrawToolTipEventHandler Draw;public event System.Windows.Forms.DrawToolTipEventHandler? Draw;member this.Draw : System.Windows.Forms.DrawToolTipEventHandler Public Custom Event Draw As DrawToolTipEventHandler Tipo de evento
Ejemplos
En el ejemplo de código siguiente se muestra cómo dibujar personalizado .ToolTip En el ejemplo se crea y ToolTip se asocia a tres Button controles ubicados en .Form En el ejemplo se establece la OwnerDraw propiedad en true y se controla el Draw evento . En el Draw controlador de eventos, ToolTip el elemento se dibuja de forma diferente, en función del botón para el que se muestre el ToolTip elemento tal y como se indica en la DrawToolTipEventArgs.AssociatedControl propiedad .
#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
Comentarios
Con el Draw evento , puede personalizar la apariencia de ToolTip.
La Draw clase genera el ToolTip evento cuando ToolTip se dibuja y el valor de la ToolTip.OwnerDraw propiedad es true y la IsBalloon propiedad es false. La DrawToolTipEventArgs clase contiene toda la información necesaria para pintar ToolTip, incluido el texto de información sobre herramientas, y Rectangleel objeto en el Graphics que se debe realizar el dibujo. Para personalizar el aspecto de la información sobre herramientas, use Rectangle para determinar los límites de la información sobre herramientas y el objeto para realizar el Graphics dibujo personalizado. Puede aumentar los límites de antes ToolTip de que se muestre controlando el Popup evento.
Para obtener más información sobre el manejo de eventos, consulte controlar y provocar eventos.
Se aplica a
Consulte también
Colaborar con nosotros en GitHub
El origen de este contenido se puede encontrar en GitHub, donde también puede crear y revisar problemas y solicitudes de incorporación de cambios. Para más información, consulte nuestra guía para colaboradores.
