DesignerTransaction Třída
Definice
Důležité
Některé informace platí pro předběžně vydaný produkt, který se může zásadně změnit, než ho výrobce nebo autor vydá. Microsoft neposkytuje žádné záruky, výslovné ani předpokládané, týkající se zde uváděných informací.
Poskytuje způsob, jak seskupit řadu akcí v době návrhu, aby se zlepšil výkon a umožnil vrácení většiny typů změn zpět.
public ref class DesignerTransaction abstract : IDisposable
public abstract class DesignerTransaction : IDisposable
type DesignerTransaction = class
interface IDisposable
Public MustInherit Class DesignerTransaction
Implements IDisposable
- Dědičnost
-
DesignerTransaction
- Implementuje
Příklady
Následující ukázkový program kódu ukazuje, jak vytvořit DesignerTransaction z návrháře. Pokud chcete spustit tuto ukázku, zkompilujte zdrojový kód do knihovny tříd. Je nutné přidat odkaz na sestavení System.Design. V novém projektu přidejte odkaz na zkompilovanou knihovnu DLL a přidejte komponentu v knihovně do sady nástrojů.
Tato funkce je v Visual Studio rozšířená.
Viz také návod: Automatické naplnění sady nástrojů vlastními komponentami.
Návrhář může volitelně zobrazit oznámení o událostech transakcí návrháře. Pokud přidáte instanci DTComponent formuláře v režimu návrhu, zobrazí se okno se zprávou s dotazem, jestli chcete dostávat oznámení událostí transakce návrháře. Tato oznámení můžete přepnout pomocí místní nabídky, která se zobrazí po kliknutí pravým tlačítkem myši na instanci DTComponent. Transakce se vytvoří při změně hodnot pomocí okno Vlastnosti. Návrhář může také provést transakci kliknutím na Provést ukázkovou transakci v místní nabídce komponenty.
#using <system.dll>
#using <system.design.dll>
#using <system.windows.forms.dll>
using namespace System;
using namespace System::ComponentModel;
using namespace System::ComponentModel::Design;
using namespace System::Windows::Forms;
using namespace System::Windows::Forms::Design;
/*
This sample demonstrates how to perform a series of actions in a designer
transaction, how to change values of properties of a component from a
designer, and how to complete transactions without being interrupted
by other activities.
To run this sample, add this code to a class library project and compile.
Create a new Windows Forms project or load a form in the designer. Add a
reference to the class library that was compiled in the first step.
Right-click the Toolbox in design mode and click Customize Toolbox.
Browse to the class library that was compiled in the first step and
select OK until the DTComponent item appears in the Toolbox. Add an
instance of this component to the form.
When the component is created and added to the component tray for your
design project, the Initialize method of the designer is called.
This method displays a message box informing you that designer transaction
event handlers will be registered unless you click Cancel. When you set
properties in the properties window, each change will be encapsulated in
a designer transaction, allowing the change to be undone later.
When you right-click the component, the shortcut menu for the component
is displayed. The designer constructs this menu according to whether
designer transaction notifications are enabled, and offers the option
of enabling or disabling the notifications, depending on the current
mode. The shortcut menu also presents a Perform Example Transaction
item, which will set the values of the component's StringProperty and
CountProperty properties. You can undo the last designer transaction using
the Undo command provided by the Visual Studio development environment.
*/
private ref class DTDesigner: public ComponentDesigner
{
private:
bool notification_mode;
int count;
void LinkDTNotifications( Object^ /*sender*/, EventArgs^ /*e*/ )
{
if ( !notification_mode )
{
IDesignerHost^ host = dynamic_cast<IDesignerHost^>(GetService( IDesignerHost::typeid ));
if ( host != nullptr )
{
notification_mode = true;
host->TransactionOpened += gcnew EventHandler( this, &DTDesigner::OnDesignerTransactionOpened );
host->TransactionClosed += gcnew DesignerTransactionCloseEventHandler( this, &DTDesigner::OnDesignerTransactionClosed );
}
}
}
void UnlinkDTNotifications( Object^ /*sender*/, EventArgs^ /*e*/ )
{
if ( notification_mode )
{
IDesignerHost^ host = dynamic_cast<IDesignerHost^>(GetService( IDesignerHost::typeid ));
if ( host != nullptr )
{
notification_mode = false;
host->TransactionOpened -= gcnew EventHandler( this, &DTDesigner::OnDesignerTransactionOpened );
host->TransactionClosed -= gcnew DesignerTransactionCloseEventHandler( this, &DTDesigner::OnDesignerTransactionClosed );
}
}
}
void OnDesignerTransactionOpened( Object^ /*sender*/, EventArgs^ /*e*/ )
{
MessageBox::Show( "A Designer Transaction was started. (TransactionOpened)" );
}
void OnDesignerTransactionClosed( Object^ /*sender*/, DesignerTransactionCloseEventArgs^ /*e*/ )
{
MessageBox::Show( "A Designer Transaction was completed. (TransactionClosed)" );
}
void DoTransaction( Object^ /*sender*/, EventArgs^ /*e*/ )
{
IDesignerHost^ host = static_cast<IDesignerHost^>(GetService( IDesignerHost::typeid ));
DesignerTransaction^ t = host->CreateTransaction( "Change Text and Size" );
/* The code within the using statement is considered to be a single transaction.
When the user selects Undo, the system will undo everything executed in this code block.
*/
if ( notification_mode )
MessageBox::Show( "Entering a Designer-Initiated Designer Transaction" );
// The .NET Framework automatically associates the TypeDescriptor with the correct component
PropertyDescriptor^ someText = TypeDescriptor::GetProperties( Component )[ "StringProperty" ];
someText->SetValue( Component, "This text was set by the designer for this component." );
PropertyDescriptor^ anInteger = TypeDescriptor::GetProperties( Component )[ "CountProperty" ];
anInteger->SetValue( Component, count );
count++;
// Complete the designer transaction.
t->Commit();
if ( notification_mode )
MessageBox::Show( "Designer-Initiated Designer Transaction Completed" );
}
public:
property DesignerVerbCollection^ Verbs
{
// The Verbs property is overridden from ComponentDesigner
virtual DesignerVerbCollection^ get() override
{
DesignerVerbCollection^ dvc = gcnew DesignerVerbCollection;
dvc->Add( gcnew DesignerVerb( "Perform Example Transaction",gcnew EventHandler( this, &DTDesigner::DoTransaction ) ) );
if ( notification_mode )
dvc->Add( gcnew DesignerVerb( "End Designer Transaction Notifications",
gcnew EventHandler( this, &DTDesigner::UnlinkDTNotifications ) ) );
else
dvc->Add( gcnew DesignerVerb( "Show Designer Transaction Notifications",
gcnew EventHandler( this, &DTDesigner::LinkDTNotifications ) ) );
return dvc;
}
}
virtual void Initialize( IComponent^ component ) override
{
ComponentDesigner::Initialize( component );
notification_mode = false;
count = 10;
IDesignerHost^ host = dynamic_cast<IDesignerHost^>(GetService( IDesignerHost::typeid ));
if ( host == nullptr )
{
MessageBox::Show( "The IDesignerHost service interface could not be obtained." );
return;
}
if ( MessageBox::Show( "Press the Yes button to display notification message boxes for the designer transaction opened and closed notifications.", "Link DesignerTransaction Notifications?", MessageBoxButtons::YesNo, MessageBoxIcon::Question, MessageBoxDefaultButton::Button1, MessageBoxOptions::RightAlign ) == DialogResult::Yes )
{
host->TransactionOpened += gcnew EventHandler( this, &DTDesigner::OnDesignerTransactionOpened );
host->TransactionClosed += gcnew DesignerTransactionCloseEventHandler( this, &DTDesigner::OnDesignerTransactionClosed );
notification_mode = true;
}
}
public:
~DTDesigner()
{
UnlinkDTNotifications( this, gcnew EventArgs );
}
};
// Associate the DTDesigner with this component
[DesignerAttribute(DTDesigner::typeid)]
public ref class DTComponent: public System::ComponentModel::Component
{
private:
String^ m_String;
int m_Count;
void InitializeComponent()
{
m_String = "Initial Value";
m_Count = 0;
}
public:
property String^ StringProperty
{
String^ get()
{
return m_String;
}
void set( String^ value )
{
m_String = value;
}
}
property int CountProperty
{
int get()
{
return m_Count;
}
void set( int value )
{
m_Count = value;
}
}
};
using System;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Windows.Forms;
using System.Windows.Forms.Design;
/*
This sample demonstrates how to perform a series of actions in a designer
transaction, how to change values of properties of a component from a
designer, and how to complete transactions without being interrupted
by other activities.
To run this sample, add this code to a class library project and compile.
Create a new Windows Forms project or load a form in the designer. Add a
reference to the class library that was compiled in the first step.
Right-click the Toolbox in design mode and click Customize Toolbox.
Browse to the class library that was compiled in the first step and
select OK until the DTComponent item appears in the Toolbox. Add an
instance of this component to the form.
When the component is created and added to the component tray for your
design project, the Initialize method of the designer is called.
This method displays a message box informing you that designer transaction
event handlers will be registered unless you click Cancel. When you set
properties in the properties window, each change will be encapsulated in
a designer transaction, allowing the change to be undone later.
When you right-click the component, the shortcut menu for the component
is displayed. The designer constructs this menu according to whether
designer transaction notifications are enabled, and offers the option
of enabling or disabling the notifications, depending on the current
mode. The shortcut menu also presents a Perform Example Transaction
item, which will set the values of the component's StringProperty and
CountProperty properties. You can undo the last designer transaction using
the Undo command provided by the Visual Studio development environment.
*/
namespace DesignerTransactionSample
{
// Associate the DTDesigner with this component
[DesignerAttribute(typeof(DTDesigner))]
public class DTComponent : System.ComponentModel.Component
{
private string m_String;
private int m_Count;
public string StringProperty
{
get
{ return m_String; }
set
{ m_String = value; }
}
public int CountProperty
{
get
{ return m_Count; }
set
{ m_Count = value; }
}
private void InitializeComponent()
{
m_String = "Initial Value";
m_Count = 0;
}
}
internal class DTDesigner : ComponentDesigner
{
private bool notification_mode = false;
private int count = 10;
// The Verbs property is overridden from ComponentDesigner
public override DesignerVerbCollection Verbs
{
get
{
DesignerVerbCollection dvc = new DesignerVerbCollection();
dvc.Add( new DesignerVerb("Perform Example Transaction", new EventHandler(this.DoTransaction)) );
if(notification_mode)
dvc.Add(new DesignerVerb("End Designer Transaction Notifications", new EventHandler(this.UnlinkDTNotifications)));
else
dvc.Add(new DesignerVerb("Show Designer Transaction Notifications", new EventHandler(this.LinkDTNotifications))); return dvc;
}
}
public override void Initialize(System.ComponentModel.IComponent component)
{
base.Initialize(component);
IDesignerHost host = (IDesignerHost)GetService(typeof(IDesignerHost));
if(host == null)
{
MessageBox.Show("The IDesignerHost service interface could not be obtained.");
return;
}
if( MessageBox.Show("Press the Yes button to display notification message boxes for the designer transaction opened and closed notifications.","Link DesignerTransaction Notifications?", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button1, MessageBoxOptions.RightAlign) == DialogResult.Yes )
{
host.TransactionOpened += new EventHandler(OnDesignerTransactionOpened);
host.TransactionClosed += new DesignerTransactionCloseEventHandler(OnDesignerTransactionClosed);
notification_mode = true;
}
}
private void LinkDTNotifications(object sender, EventArgs e)
{
if(!notification_mode)
{
IDesignerHost host = (IDesignerHost)GetService(typeof(IDesignerHost));
if(host != null)
{
notification_mode = true;
host.TransactionOpened += new EventHandler(OnDesignerTransactionOpened);
host.TransactionClosed += new DesignerTransactionCloseEventHandler(OnDesignerTransactionClosed);
}
}
}
private void UnlinkDTNotifications(object sender, EventArgs e)
{
if(notification_mode)
{
IDesignerHost host = (IDesignerHost)GetService(typeof(IDesignerHost));
if(host != null)
{
notification_mode = false;
host.TransactionOpened -= new EventHandler(OnDesignerTransactionOpened);
host.TransactionClosed -= new DesignerTransactionCloseEventHandler(OnDesignerTransactionClosed);
}
}
}
private void OnDesignerTransactionOpened(object sender, EventArgs e)
{
System.Windows.Forms.MessageBox.Show("A Designer Transaction was started. (TransactionOpened)");
}
private void OnDesignerTransactionClosed(object sender, DesignerTransactionCloseEventArgs e)
{
System.Windows.Forms.MessageBox.Show("A Designer Transaction was completed. (TransactionClosed)");
}
private void DoTransaction(object sender, EventArgs e)
{
IDesignerHost host = (IDesignerHost)GetService(typeof(IDesignerHost));
DesignerTransaction t = host.CreateTransaction("Change Text and Size");
/* The code within the using statement is considered to be a single transaction.
When the user selects Undo, the system will undo everything executed in this code block. */
using (t)
{
if(notification_mode)
System.Windows.Forms.MessageBox.Show("Entering a Designer-Initiated Designer Transaction");
// The .NET Framework automatically associates the TypeDescriptor with the correct component
PropertyDescriptor someText = TypeDescriptor.GetProperties(Component)["StringProperty"];
someText.SetValue(Component, "This text was set by the designer for this component.");
PropertyDescriptor anInteger = TypeDescriptor.GetProperties(Component)["CountProperty"];
anInteger.SetValue(Component, count);
count++;
// Complete the designer transaction.
t.Commit();
if(notification_mode)
System.Windows.Forms.MessageBox.Show("Designer-Initiated Designer Transaction Completed");
}
}
protected override void Dispose(bool disposing)
{
UnlinkDTNotifications(this, new EventArgs());
base.Dispose(disposing);
}
}
}
Imports System.ComponentModel
Imports System.ComponentModel.Design
Imports System.Windows.Forms
Imports System.Windows.Forms.Design
' This sample demonstrates how to perform a series of actions in a designer
' transaction, how to change values of properties of a component from a
' designer, and how to complete transactions without being interrupted
' by other activities.
' To run this sample, add this code to a class library project and compile.
' Create a new Windows Forms project or load a form in the designer. Add a
' reference to the class library that was compiled in the first step.
' Right-click the Toolbox in design mode and click Customize Toolbox.
' Browse to the class library that was compiled in the first step and
' select OK until the DTComponent item appears in the Toolbox. Add an
' instance of this component to the form.
' When the component is created and added to the component tray for your
' design project, the Initialize method of the designer is called.
' This method displays a message box informing you that designer transaction
' event handlers are being registered unless you click Cancel. When you set
' properties in the properties window, each change will be encapsulated in
' a designer transaction, allowing the change to be undone later.
' When you right-click the component, the shortcut menu for the component
' is displayed. The designer constructs this menu according to whether
' designer transaction notifications are enabled, and offers the option
' of enabling or disabling the notifications, depending on the current
' mode. The shortcut menu also presents a Perform Example Transaction
' item which will set the values of the component's StringProperty and
' CountProperty properties. You can undo the last designer transaction using
' the Undo command provided by the Visual Studio development environment.
Namespace DesignerTransactionSample
' Associate the DTDesigner with this component
<DesignerAttribute(GetType(DTDesigner))> _
Public Class DTComponent
Inherits System.ComponentModel.Component
Private m_String As String
Private m_Count As Integer
Public Property StringProperty() As String
Get
Return m_String
End Get
Set(ByVal Value As String)
m_String = Value
End Set
End Property
Public Property CountProperty() As Integer
Get
Return m_Count
End Get
Set(ByVal Value As Integer)
m_Count = Value
End Set
End Property
Private Sub InitializeComponent()
m_String = "Initial Value"
m_Count = 0
End Sub
End Class
Friend Class DTDesigner
Inherits ComponentDesigner
Private notification_mode As Boolean = False
Private count As Integer = 10
' The Verbs property is overridden from ComponentDesigner
Public Overrides ReadOnly Property Verbs() As DesignerVerbCollection
Get
Dim dvc As New DesignerVerbCollection()
dvc.Add(New DesignerVerb("Perform Example Transaction", AddressOf Me.DoTransaction))
If notification_mode Then
dvc.Add(New DesignerVerb("End Designer Transaction Notifications", AddressOf Me.UnlinkDTNotifications))
Else
dvc.Add(New DesignerVerb("Show Designer Transaction Notifications", AddressOf Me.LinkDTNotifications))
End If
Return dvc
End Get
End Property
Public Overrides Sub Initialize(ByVal component As System.ComponentModel.IComponent)
MyBase.Initialize(component)
Dim host As IDesignerHost = CType(GetService(GetType(IDesignerHost)), IDesignerHost)
If host Is Nothing Then
MessageBox.Show("The IDesignerHost service interface could not be obtained.")
Return
End If
If MessageBox.Show("Press the Yes button to display notification message boxes for the designer transaction opened and closed notifications.", "Link DesignerTransaction Notifications?", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button1, MessageBoxOptions.RightAlign) = DialogResult.Yes Then
AddHandler host.TransactionOpened, AddressOf OnDesignerTransactionOpened
AddHandler host.TransactionClosed, AddressOf OnDesignerTransactionClosed
notification_mode = True
End If
End Sub
Private Sub LinkDTNotifications(ByVal sender As Object, ByVal e As EventArgs)
If notification_mode = False Then
Dim host As IDesignerHost = CType(GetService(GetType(IDesignerHost)), IDesignerHost)
If (host IsNot Nothing) Then
notification_mode = True
AddHandler host.TransactionOpened, AddressOf OnDesignerTransactionOpened
AddHandler host.TransactionClosed, AddressOf OnDesignerTransactionClosed
End If
End If
End Sub
Private Sub UnlinkDTNotifications(ByVal sender As Object, ByVal e As EventArgs)
If notification_mode Then
Dim host As IDesignerHost = CType(GetService(GetType(IDesignerHost)), IDesignerHost)
If (host IsNot Nothing) Then
notification_mode = False
RemoveHandler host.TransactionOpened, AddressOf Me.OnDesignerTransactionOpened
RemoveHandler host.TransactionClosed, AddressOf Me.OnDesignerTransactionClosed
End If
End If
End Sub
Private Sub OnDesignerTransactionOpened(ByVal sender As Object, ByVal e As EventArgs)
System.Windows.Forms.MessageBox.Show("A Designer Transaction was started. (TransactionOpened)")
End Sub
Private Sub OnDesignerTransactionClosed(ByVal sender As Object, ByVal e As DesignerTransactionCloseEventArgs)
System.Windows.Forms.MessageBox.Show("A Designer Transaction was completed. (TransactionClosed)")
End Sub
Private Sub DoTransaction(ByVal sender As Object, ByVal e As EventArgs)
Dim host As IDesignerHost = CType(GetService(GetType(IDesignerHost)), IDesignerHost)
Dim t As DesignerTransaction = host.CreateTransaction("Change Text and Size")
' The code within the using statement is considered to be a single transaction.
' When the user selects Undo, the system will undo everything executed in this code block.
Try
If (notification_mode) Then
System.Windows.Forms.MessageBox.Show("Entering a Designer-Initiated Designer Transaction")
End If
Dim someText As PropertyDescriptor = TypeDescriptor.GetProperties(Component)("StringProperty")
someText.SetValue(Component, "This text was set by the designer for this component.")
Dim anInteger As PropertyDescriptor = TypeDescriptor.GetProperties(Component)("CountProperty")
anInteger.SetValue(Component, count)
count = count + 1
Exit Try
Finally
t.Commit()
End Try
If (notification_mode) Then
System.Windows.Forms.MessageBox.Show("Designer-Initiated Designer Transaction Completed")
End If
End Sub
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
UnlinkDTNotifications(Me, New EventArgs())
MyBase.Dispose(disposing)
End Sub
End Class
End Namespace 'DesignerTransactionSample
Poznámky
Transakce můžou sledovat akce, které lze později vrátit zpět. Změny provedené během transakce lze vrátit zpět zrušením transakce, která se automaticky pokusí vrátit zpět každou změnu nastavením každé změněné vlastnosti na hodnotu předběžné změny. Transakce mohou také zvýšit výkon během řady operací odložením aktualizací zobrazení do dokončení transakce.
Při probíhající transakci některé komponenty odloží jejich zpracování, dokud transakce nedokončí naslouchání TransactionOpening událostem a TransactionClosed událostem. Například okno Vlastnosti neaktualizuje zobrazení po otevření transakce, dokud transakce nezavřela.
Chcete-li použít transakce pro reverzibilní nebo více operací, vytvořte návrhář DesignerTransaction pro každou operaci nebo řadu operací, které by měly být reverzibilní. Dávejte pozor, abyste neprováděli akce mimo transakce, které by mohly zabránit úspěšnému dokončení posloupnosti událostí vrácení zpět.
Nový můžete získat DesignerTransaction voláním CreateTransaction metody IDesignerHost. Nezapomeňte každý z aktivních DesignerTransaction získatIDesignerHost, aby se správně integrovali s mechanismem zpracování transakcí návrháře, a ne vytvořit nový DesignerTransaction přímo.
Chcete-li provést akci v rámci transakce, musíte nejprve vytvořit transakci. Pak je nutné volat metodu OnComponentChanging před každou změnou nebo sadou změn a OnComponentChanged metoda po každé změně nebo sadě změn dojde. Nakonec dokončete a zavřete transakci voláním Commit metody.
Note
Při provádění změn hodnot vlastností použijte SetValue metodu PropertyDescriptor, která volá metody IComponentChangeService změny komponenty a vytvoří DesignerTransaction reprezentaci změny automaticky.
Pokud chcete provést transakci, proveďte následující kroky:
Volání CreateTransaction k získání DesignerTransaction , které lze použít k řízení transakce.
tryV rámci bloku pro každou akci, kterou chcete sledovat pomocí DesignerTransactionmetody , volání OnComponentChanging metody, proveďte změnu nebo změny a potom zavolejte metoduOnComponentChanged, aby signalizovala, že došlo ke změně nebo změnám.Transakci dokončíte voláním Commit z
finallybloku.
V jazyce C# můžete místo bloku použít using příkaz try/finally , například v následujícím příkladu.
using (host.CreateTransaction() {
// Insert your code here.
}
Chcete-li zrušit a pokusit se vrátit zpět transakce před potvrzením, zavolejte metodu Cancel . Cancel Při vyvolání metody jsou akce sledované pomocí obrácenéDesignerTransaction, aby se pokusily vrátit zpět změny. Chcete-li vrátit zpět akce, ke kterým došlo v rámci předchozích transakcí, je nutné použít příkaz zpět poskytnutý vývojovým prostředím.
Konstruktory
| Name | Description |
|---|---|
| DesignerTransaction() |
Inicializuje novou instanci DesignerTransaction třídy bez popisu. |
| DesignerTransaction(String) |
Inicializuje novou instanci DesignerTransaction třídy pomocí zadaného popisu transakce. |
Vlastnosti
| Name | Description |
|---|---|
| Canceled |
Získá hodnotu určující, zda transakce byla zrušena. |
| Committed |
Získá hodnotu určující, zda transakce byla potvrzena. |
| Description |
Získá popis transakce. |
Metody
| Name | Description |
|---|---|
| Cancel() |
Zruší transakci a pokusí se vrátit změny provedené událostmi transakce. |
| Commit() |
Potvrdí tuto transakci. |
| Dispose(Boolean) |
Uvolní nespravované prostředky používané DesignerTransaction a volitelně uvolní spravované prostředky. |
| Equals(Object) |
Určuje, zda je zadaný objekt roven aktuálnímu objektu. (Zděděno od Object) |
| Finalize() |
Uvolní prostředky přidružené k tomuto objektu. Toto přepsání potvrdí tuto transakci, pokud ještě nebyla potvrzena. |
| GetHashCode() |
Slouží jako výchozí funkce hash. (Zděděno od Object) |
| GetType() |
Získá Type aktuální instance. (Zděděno od Object) |
| MemberwiseClone() |
Vytvoří mělkou kopii aktuálního Object. (Zděděno od Object) |
| OnCancel() |
|
| OnCommit() |
Provádí skutečnou práci potvrzení transakce. |
| ToString() |
Vrátí řetězec, který představuje aktuální objekt. (Zděděno od Object) |
Explicitní implementace rozhraní
| Name | Description |
|---|---|
| IDisposable.Dispose() |
Uvolní všechny prostředky používané nástrojem DesignerTransaction. |