WindowsFormsComponentEditor Classe
Definição
Importante
Algumas informações se referem a produtos de pré-lançamento que podem ser substancialmente modificados antes do lançamento. A Microsoft não oferece garantias, expressas ou implícitas, das informações aqui fornecidas.
Fornece uma classe base para os editores que usam uma caixa de diálogo modal para exibir uma página de propriedades semelhante à página de propriedades de um controle ActiveX.
public ref class WindowsFormsComponentEditor abstract : System::ComponentModel::ComponentEditorpublic abstract class WindowsFormsComponentEditor : System.ComponentModel.ComponentEditortype WindowsFormsComponentEditor = class
inherit ComponentEditorPublic MustInherit Class WindowsFormsComponentEditor
Inherits ComponentEditor- Herança
- Derivado
Exemplos
O exemplo de código a seguir demonstra uma implementação de exemplo WindowsFormsComponentEditor .
#using <System.Windows.Forms.dll>
#using <System.Drawing.dll>
#using <System.dll>
using namespace System;
using namespace System::ComponentModel;
using namespace System::ComponentModel::Design;
using namespace System::Collections;
using namespace System::Drawing;
using namespace System::IO;
using namespace System::Runtime::Serialization;
using namespace System::Runtime::Serialization::Formatters::Binary;
using namespace System::Windows::Forms;
using namespace System::Windows::Forms::Design;
// This example demonstrates how to implement a component editor that hosts
// component pages and associate it with a component. This example also
// demonstrates how to implement a component page that provides a panel-based
// control system and Help keyword support.
ref class ExampleComponentEditorPage;
// The ExampleComponentEditor displays two ExampleComponentEditorPage pages.
public ref class ExampleComponentEditor: public System::Windows::Forms::Design::WindowsFormsComponentEditor
{
protected:
// This method override returns an type array containing the type of
// each component editor page to display.
virtual array<Type^>^ GetComponentEditorPages() override
{
array<Type^>^temp0 = {ExampleComponentEditorPage::typeid,ExampleComponentEditorPage::typeid};
return temp0;
}
// This method override returns the index of the page to display when the
// component editor is first displayed.
protected:
virtual int GetInitialComponentEditorPageIndex() override
{
return 1;
}
};
// This example component editor page type provides an example
// ComponentEditorPage implementation.
private ref class ExampleComponentEditorPage: public System::Windows::Forms::Design::ComponentEditorPage
{
private:
Label^ l1;
Button^ b1;
PropertyGrid^ pg1;
// Base64-encoded serialized image data for the required component editor page icon.
String^ icon;
public:
ExampleComponentEditorPage()
{
String^ temp = "AAEAAAD/////AQAAAAAAAAAMAgAAAFRTeXN0ZW0uRHJhd2luZywgVmVyc2lvbj0xLjAuNTAwMC4wLCBDdWx0dXJlPW5ldXRyYWwsIFB1YmxpY0tleVRva2VuPWIwM2Y1ZjdmMTFkNTBhM2EFAQAAABNTeXN0ZW0uRHJhd2luZy5JY29uAgAAAAhJY29uRGF0Y"
"QhJY29uU2l6ZQcEAhNTeXN0ZW0uRHJhd2luZy5TaXplAgAAAAIAAAAJAwAAAAX8////E1N5c3RlbS5EcmF3aW5nLlNpemUCAAAABXdpZHRoBmhlaWdodAAACAgCAAAAAAAAAAAAAAAPAwAAAD4BAAACAAABAAEAEBAQAAAAAAAoAQAAFgAAACgAAAAQAAAAIA"
"AAAAEABAAAAAAAgAAAAAAAAAAAAAAAEAAAABAAAAAAAAAAAACAAACAAAAAgIAAgAAAAIAAgADExAAAgICAAMDAwAA+iPcAY77gACh9kwD/AAAAndPoADpw6wD///8AAAAAAAAAAAAHd3d3d3d3d8IiIiIiIiLHKIiIiIiIiCco///////4Jyj5mfIvIvgnKPn"
"p////+Cco+en7u7v4Jyj56f////gnKPmZ8i8i+Cco///////4JyiIiIiIiIgnJmZmZmZmZifCIiIiIiIiwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACw==";
icon = temp;
// Initialize the page, which inherits from Panel, and its controls.
this->Size = System::Drawing::Size( 400, 250 );
this->Icon = DeserializeIconFromBase64Text( icon );
this->Text = "Example Page";
b1 = gcnew Button;
b1->Size = System::Drawing::Size( 200, 20 );
b1->Location = Point(200,0);
b1->Text = "Set a random background color";
b1->Click += gcnew EventHandler( this, &ExampleComponentEditorPage::randomBackColor );
this->Controls->Add( b1 );
l1 = gcnew Label;
l1->Size = System::Drawing::Size( 190, 20 );
l1->Location = Point(4,2);
l1->Text = "Example Component Editor Page";
this->Controls->Add( l1 );
pg1 = gcnew PropertyGrid;
pg1->Size = System::Drawing::Size( 400, 280 );
pg1->Location = Point(0,30);
this->Controls->Add( pg1 );
}
// This method indicates that the Help button should be enabled for this
// component editor page.
virtual bool SupportsHelp() override
{
return true;
}
// This method is called when the Help button for this component editor page is pressed.
// This implementation uses the IHelpService to show the Help topic for a sample keyword.
public:
virtual void ShowHelp() override
{
// The GetSelectedComponent method of a ComponentEditorPage retrieves the
// IComponent associated with the WindowsFormsComponentEditor.
IComponent^ selectedComponent = this->GetSelectedComponent();
// Retrieve the Site of the component, and return if null.
ISite^ componentSite = selectedComponent->Site;
if ( componentSite == nullptr )
return;
// Acquire the IHelpService to display a help topic using a indexed keyword lookup.
IHelpService^ helpService = dynamic_cast<IHelpService^>(componentSite->GetService( IHelpService::typeid ));
if ( helpService != nullptr )
helpService->ShowHelpFromKeyword( "System.Windows.Forms.ComboBox" );
}
protected:
// The LoadComponent method is raised when the ComponentEditorPage is displayed.
virtual void LoadComponent() override
{
this->pg1->SelectedObject = this->Component;
}
// The SaveComponent method is raised when the WindowsFormsComponentEditor is closing
// or the current ComponentEditorPage is closing.
virtual void SaveComponent() override {}
private:
// If the associated component is a Control, this method sets the BackColor to a random color.
// This method is invoked by the button on this ComponentEditorPage.
void randomBackColor( Object^ /*sender*/, EventArgs^ /*e*/ )
{
if ( System::Windows::Forms::Control::typeid->IsAssignableFrom( this->::Component::GetType() ) )
{
// Sets the background color of the Control associated with the
// WindowsFormsComponentEditor to a random color.
Random^ rnd = gcnew Random;
(dynamic_cast<System::Windows::Forms::Control^>(this->Component))->BackColor = Color::FromArgb( rnd->Next( 255 ), rnd->Next( 255 ), rnd->Next( 255 ) );
pg1->Refresh();
}
}
// This method can be used to retrieve an Icon from a block
// of Base64-encoded text.
System::Drawing::Icon^ DeserializeIconFromBase64Text( String^ text )
{
System::Drawing::Icon^ img = nullptr;
array<Byte>^memBytes = Convert::FromBase64String( text );
IFormatter^ formatter = gcnew BinaryFormatter;
MemoryStream^ stream = gcnew MemoryStream( memBytes );
img = dynamic_cast<System::Drawing::Icon^>(formatter->Deserialize( stream ));
stream->Close();
return img;
}
};
// This example control is associated with the ExampleComponentEditor
// through the following EditorAttribute.
[EditorAttribute(ExampleComponentEditor::typeid,ComponentEditor::typeid)]
public ref class ExampleUserControl: public System::Windows::Forms::UserControl{};
using System;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Collections;
using System.Drawing;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.Windows.Forms;
using System.Windows.Forms.Design;
// This example demonstrates how to implement a component editor that hosts
// component pages and associate it with a component. This example also
// demonstrates how to implement a component page that provides a panel-based
// control system and Help keyword support.
namespace ComponentEditorExample
{
// The ExampleComponentEditor displays two ExampleComponentEditorPage pages.
public class ExampleComponentEditor : System.Windows.Forms.Design.WindowsFormsComponentEditor
{
// This method override returns an type array containing the type of
// each component editor page to display.
protected override Type[] GetComponentEditorPages()
{
return new Type[] { typeof(ExampleComponentEditorPage),
typeof(ExampleComponentEditorPage) };
}
// This method override returns the index of the page to display when the
// component editor is first displayed.
protected override int GetInitialComponentEditorPageIndex()
{
return 1;
}
}
// This example component editor page type provides an example
// ComponentEditorPage implementation.
internal class ExampleComponentEditorPage : System.Windows.Forms.Design.ComponentEditorPage
{
Label l1;
Button b1;
PropertyGrid pg1;
// Base64-encoded serialized image data for the required component editor page icon.
string icon = "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";
public ExampleComponentEditorPage()
{
// Initialize the page, which inherits from Panel, and its controls.
this.Size = new Size( 400, 250 );
this.Icon = DeserializeIconFromBase64Text(icon);
this.Text = "Example Page";
b1 = new Button();
b1.Size = new Size(200, 20);
b1.Location = new Point(200, 0);
b1.Text = "Set a random background color";
b1.Click += new EventHandler(this.randomBackColor);
this.Controls.Add( b1 );
l1 = new Label();
l1.Size = new Size(190, 20);
l1.Location = new Point(4, 2);
l1.Text = "Example Component Editor Page";
this.Controls.Add( l1 );
pg1 = new PropertyGrid();
pg1.Size = new Size(400, 280);
pg1.Location = new Point(0,30);
this.Controls.Add( pg1 );
}
// This method indicates that the Help button should be enabled for this
// component editor page.
public override bool SupportsHelp()
{
return true;
}
// This method is called when the Help button for this component editor page is pressed.
// This implementation uses the IHelpService to show the Help topic for a sample keyword.
public override void ShowHelp()
{
// The GetSelectedComponent method of a ComponentEditorPage retrieves the
// IComponent associated with the WindowsFormsComponentEditor.
IComponent selectedComponent = this.GetSelectedComponent();
// Retrieve the Site of the component, and return if null.
ISite componentSite = selectedComponent.Site;
if(componentSite == null)
return;
// Acquire the IHelpService to display a help topic using a indexed keyword lookup.
IHelpService helpService = (IHelpService)componentSite.GetService(typeof(IHelpService));
if (helpService != null)
helpService.ShowHelpFromKeyword("System.Windows.Forms.ComboBox");
}
// The LoadComponent method is raised when the ComponentEditorPage is displayed.
protected override void LoadComponent()
{
this.pg1.SelectedObject = this.Component;
}
// The SaveComponent method is raised when the WindowsFormsComponentEditor is closing
// or the current ComponentEditorPage is closing.
protected override void SaveComponent()
{
}
// If the associated component is a Control, this method sets the BackColor to a random color.
// This method is invoked by the button on this ComponentEditorPage.
private void randomBackColor(object sender, EventArgs e)
{
if( typeof(System.Windows.Forms.Control).IsAssignableFrom( this.Component.GetType() ) )
{
// Sets the background color of the Control associated with the
// WindowsFormsComponentEditor to a random color.
Random rnd = new Random();
((System.Windows.Forms.Control)this.Component).BackColor =
Color.FromArgb(rnd.Next(255), rnd.Next(255), rnd.Next(255));
pg1.Refresh();
}
}
// This method can be used to retrieve an Icon from a block
// of Base64-encoded text.
private Icon DeserializeIconFromBase64Text(string text)
{
Icon img = null;
byte[] memBytes = Convert.FromBase64String(text);
IFormatter formatter = new BinaryFormatter();
MemoryStream stream = new MemoryStream(memBytes);
img = (Icon)formatter.Deserialize(stream);
stream.Close();
return img;
}
}
// This example control is associated with the ExampleComponentEditor
// through the following EditorAttribute.
[EditorAttribute(typeof(ExampleComponentEditor), typeof(ComponentEditor))]
public class ExampleUserControl : System.Windows.Forms.UserControl
{
}
}
Imports System.ComponentModel
Imports System.ComponentModel.Design
Imports System.Collections
Imports System.Drawing
Imports System.IO
Imports System.Runtime.Serialization
Imports System.Runtime.Serialization.Formatters.Binary
Imports System.Windows.Forms
Imports System.Windows.Forms.Design
' This example demonstrates how to implement a component editor that hosts
' component pages and associate it with a component. This example also
' demonstrates how to implement a component page that provides a panel-based
' control system and Help keyword support.
' The ExampleComponentEditor displays two ExampleComponentEditorPage pages.
Public Class ExampleComponentEditor
Inherits System.Windows.Forms.Design.WindowsFormsComponentEditor
' This method override returns an type array containing the type of
' each component editor page to display.
Protected Overrides Function GetComponentEditorPages() As Type()
Return New Type() {GetType(ExampleComponentEditorPage), GetType(ExampleComponentEditorPage)}
End Function
' This method override returns the index of the page to display when the
' component editor is first displayed.
Protected Overrides Function GetInitialComponentEditorPageIndex() As Integer
Return 1
End Function
Public Overloads Overrides Function EditComponent(ByVal context As System.ComponentModel.ITypeDescriptorContext, ByVal component As Object) As Boolean
End Function
End Class
' This example component editor page type provides an example
' ComponentEditorPage implementation.
Friend Class ExampleComponentEditorPage
Inherits System.Windows.Forms.Design.ComponentEditorPage
Private l1 As Label
Private b1 As Button
Private pg1 As PropertyGrid
' Base64-encoded serialized image data for the required component editor page icon.
Private icondata As String = "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"
Public Sub New()
' Initialize the page, which inherits from Panel, and its controls.
Me.Size = New Size(400, 250)
Me.Icon = DeserializeIconFromBase64Text(icondata)
Me.Text = "Example Page"
b1 = New Button
b1.Size = New Size(200, 20)
b1.Location = New Point(200, 0)
b1.Text = "Set a random background color"
AddHandler b1.Click, AddressOf Me.randomBackColor
Me.Controls.Add(b1)
l1 = New Label
l1.Size = New Size(190, 20)
l1.Location = New Point(4, 2)
l1.Text = "Example Component Editor Page"
Me.Controls.Add(l1)
pg1 = New PropertyGrid
pg1.Size = New Size(400, 280)
pg1.Location = New Point(0, 30)
Me.Controls.Add(pg1)
End Sub
' This method indicates that the Help button should be enabled for this
' component editor page.
Public Overrides Function SupportsHelp() As Boolean
Return True
End Function
' This method is called when the Help button for this component editor page is pressed.
' This implementation uses the IHelpService to show the Help topic for a sample keyword.
Public Overrides Sub ShowHelp()
' The GetSelectedComponent method of a ComponentEditorPage retrieves the
' IComponent associated with the WindowsFormsComponentEditor.
Dim selectedComponent As IComponent = Me.GetSelectedComponent()
' Retrieve the Site of the component, and return if null.
Dim componentSite As ISite = selectedComponent.Site
If componentSite Is Nothing Then
Return
End If
' Acquire the IHelpService to display a help topic using a indexed keyword lookup.
Dim helpService As IHelpService = CType(componentSite.GetService(GetType(IHelpService)), IHelpService)
If (helpService IsNot Nothing) Then
helpService.ShowHelpFromKeyword("System.Windows.Forms.ComboBox")
End If
End Sub
' The LoadComponent method is raised when the ComponentEditorPage is displayed.
Protected Overrides Sub LoadComponent()
Me.pg1.SelectedObject = Me.Component
End Sub
' The SaveComponent method is raised when the WindowsFormsComponentEditor is closing
' or the current ComponentEditorPage is closing.
Protected Overrides Sub SaveComponent()
End Sub
' If the associated component is a Control, this method sets the BackColor to a random color.
' This method is invoked by the button on this ComponentEditorPage.
Private Sub randomBackColor(ByVal sender As Object, ByVal e As EventArgs)
If GetType(System.Windows.Forms.Control).IsAssignableFrom(CType(Me.Component, Object).GetType()) Then
' Sets the background color of the Control associated with the
' WindowsFormsComponentEditor to a random color.
Dim rnd As New Random
CType(Me.Component, System.Windows.Forms.Control).BackColor = Color.FromArgb(rnd.Next(255), rnd.Next(255), rnd.Next(255))
pg1.Refresh()
End If
End Sub
' This method can be used to retrieve an Icon from a block
' of Base64-encoded text.
Private Function DeserializeIconFromBase64Text(ByVal [text] As String) As icon
Dim img As Icon = Nothing
Dim memBytes As Byte() = Convert.FromBase64String([text])
Dim formatter As New BinaryFormatter
Dim stream As New MemoryStream(memBytes)
img = CType(formatter.Deserialize(stream), Icon)
stream.Close()
Return img
End Function
End Class
' This example control is associated with the ExampleComponentEditor
' through the following EditorAttribute.
<EditorAttribute(GetType(ExampleComponentEditor), GetType(ComponentEditor))> _
Public Class ExampleUserControl
Inherits System.Windows.Forms.UserControl
End Class
Construtores
| WindowsFormsComponentEditor() |
Inicializa uma nova instância da classe WindowsFormsComponentEditor. |
Métodos
| EditComponent(ITypeDescriptorContext, Object) |
Cria uma janela do editor que permite que o usuário edite o componente especificado, usando as informações de contexto especificadas. |
| EditComponent(ITypeDescriptorContext, Object, IWin32Window) |
Cria uma janela do editor que permite que o usuário edite o componente especificado. |
| EditComponent(Object) |
Edita o componente e retorna um valor que indica se o componente foi modificado. (Herdado de ComponentEditor) |
| EditComponent(Object, IWin32Window) |
Cria uma janela do editor que permite que o usuário edite o componente especificado, usando a janela especificada que possui o componente. |
| Equals(Object) |
Determina se o objeto especificado é igual ao objeto atual. (Herdado de Object) |
| GetComponentEditorPages() |
Obtém as páginas do editor de componentes associadas ao editor de componentes. |
| GetHashCode() |
Serve como a função de hash padrão. (Herdado de Object) |
| GetInitialComponentEditorPageIndex() |
Obtém o índice da página inicial do editor de componentes a ser exibida. |
| GetType() |
Obtém o Type da instância atual. (Herdado de Object) |
| MemberwiseClone() |
Cria uma cópia superficial do Object atual. (Herdado de Object) |
| ToString() |
Retorna uma cadeia de caracteres que representa o objeto atual. (Herdado de Object) |