IRootDesigner Interface
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Provides support for root-level designer view technologies.
public interface class IRootDesigner : IDisposable, System::ComponentModel::Design::IDesigner
public interface class IRootDesigner : System::ComponentModel::Design::IDesigner
public interface IRootDesigner : IDisposable, System.ComponentModel.Design.IDesigner
[System.Runtime.InteropServices.ComVisible(true)]
public interface IRootDesigner : IDisposable, System.ComponentModel.Design.IDesigner
public interface IRootDesigner : System.ComponentModel.Design.IDesigner
type IRootDesigner = interface
interface IDesigner
interface IDisposable
[<System.Runtime.InteropServices.ComVisible(true)>]
type IRootDesigner = interface
interface IDesigner
interface IDisposable
Public Interface IRootDesigner
Implements IDesigner, IDisposable
Public Interface IRootDesigner
Implements IDesigner
- Derived
- Attributes
- Implements
The following code example demonstrates a IRootDesigner implementation associated with a sample user control. This IRootDesigner implementation displays a control for the background view in designer view by overriding the GetView method. You need to add a reference to the System.Design assembly to compile the example.
To use this example, add the source code to a project and show the RootViewSampleComponent
in designer view to display the custom root designer view.
#using <System.Windows.Forms.dll>
#using <System.Drawing.dll>
#using <System.Design.dll>
#using <System.dll>
using namespace System;
using namespace System::Collections;
using namespace System::ComponentModel;
using namespace System::ComponentModel::Design;
using namespace System::Diagnostics;
using namespace System::Drawing;
using namespace System::Windows::Forms;
using namespace System::Windows::Forms::Design;
namespace SampleRootDesigner
{
ref class SampleRootDesigner;
// This sample demonstrates how to provide the root designer view, or
// design mode background view, by overriding IRootDesigner.GetView().
// The following attribute associates the SampleRootDesigner designer
// with the SampleComponent component.
[Designer(SampleRootDesigner::typeid,IRootDesigner::typeid)]
public ref class RootDesignedComponent: public Component
{
public:
RootDesignedComponent(){}
};
public ref class SampleRootDesigner: public ComponentDesigner, public IRootDesigner
{
private:
ref class RootDesignerView;
// Member field of custom type RootDesignerView, a control that
// will be shown in the Forms designer view. This member is
// cached to reduce processing needed to recreate the
// view control on each call to GetView().
RootDesignerView^ m_view;
// This method returns an instance of the view for this root
// designer. The "view" is the user interface that is presented
// in a document window for the user to manipulate.
virtual Object^ GetView( ViewTechnology technology ) sealed = IRootDesigner::GetView
{
if ( technology != ViewTechnology::WindowsForms )
{
throw gcnew ArgumentException( "Not a supported view technology","technology" );
}
if ( m_view == nullptr )
{
// Some type of displayable Form or control is required
// for a root designer that overrides GetView(). In this
// example, a Control of type RootDesignerView is used.
// Any class that inherits from Control will work.
m_view = gcnew RootDesignerView( this );
}
return m_view;
}
// IRootDesigner.SupportedTechnologies is a required override for an
// IRootDesigner. WindowsForms is the view technology used by this designer.
public:
property array<ViewTechnology>^ SupportedTechnologies
{
virtual array<ViewTechnology>^ get()
{
return gcnew array<ViewTechnology> {ViewTechnology::Default};
}
}
// RootDesignerView is a simple control that will be displayed
// in the designer window.
ref class RootDesignerView: public Control
{
private:
SampleRootDesigner^ m_designer;
public:
RootDesignerView( SampleRootDesigner^ designer )
{
m_designer = designer;
BackColor = Color::Blue;
Font = gcnew System::Drawing::Font( Font->FontFamily->Name,24.0f );
}
protected:
virtual void OnPaint( PaintEventArgs^ pe ) override
{
Control::OnPaint( pe );
// Draws the name of the component in large letters.
pe->Graphics->DrawString( m_designer->Component->Site->Name, Font, Brushes::Yellow, ClientRectangle );
}
};
};
// This sample component inherits from RootDesignedComponent which
// uses the SampleRootDesigner.
public ref class RootViewSampleComponent: public RootDesignedComponent
{
public:
RootViewSampleComponent(){}
};
}
using System;
using System.Collections;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Diagnostics;
using System.Drawing;
using System.Windows.Forms;
using System.Windows.Forms.Design;
namespace SampleRootDesigner
{
// This sample demonstrates how to provide the root designer view, or
// design mode background view, by overriding IRootDesigner.GetView().
// This sample component inherits from RootDesignedComponent which
// uses the SampleRootDesigner.
public class RootViewSampleComponent : RootDesignedComponent
{
public RootViewSampleComponent()
{
}
}
// The following attribute associates the SampleRootDesigner designer
// with the SampleComponent component.
[Designer(typeof(SampleRootDesigner), typeof(IRootDesigner))]
public class RootDesignedComponent : Component
{
public RootDesignedComponent()
{
}
}
public class SampleRootDesigner : ComponentDesigner, IRootDesigner
{
// Member field of custom type RootDesignerView, a control that
// will be shown in the Forms designer view. This member is
// cached to reduce processing needed to recreate the
// view control on each call to GetView().
private RootDesignerView m_view;
// This method returns an instance of the view for this root
// designer. The "view" is the user interface that is presented
// in a document window for the user to manipulate.
object IRootDesigner.GetView(ViewTechnology technology)
{
if (technology != ViewTechnology.Default)
{
throw new ArgumentException("Not a supported view technology", "technology");
}
if (m_view == null)
{
// Some type of displayable Form or control is required
// for a root designer that overrides GetView(). In this
// example, a Control of type RootDesignerView is used.
// Any class that inherits from Control will work.
m_view = new RootDesignerView(this);
}
return m_view;
}
// IRootDesigner.SupportedTechnologies is a required override for an
// IRootDesigner. Default is the view technology used by this designer.
ViewTechnology[] IRootDesigner.SupportedTechnologies
{
get
{
return new ViewTechnology[] {ViewTechnology.Default};
}
}
// RootDesignerView is a simple control that will be displayed
// in the designer window.
private class RootDesignerView : Control
{
private SampleRootDesigner m_designer;
public RootDesignerView(SampleRootDesigner designer)
{
m_designer = designer;
BackColor = Color.Blue;
Font = new Font(Font.FontFamily.Name, 24.0f);
}
protected override void OnPaint(PaintEventArgs pe)
{
base.OnPaint(pe);
// Draws the name of the component in large letters.
pe.Graphics.DrawString(m_designer.Component.Site.Name, Font, Brushes.Yellow, ClientRectangle);
}
}
}
}
Imports System.Collections
Imports System.ComponentModel
Imports System.ComponentModel.Design
Imports System.Diagnostics
Imports System.Drawing
Imports System.Windows.Forms
Imports System.Windows.Forms.Design
Namespace SampleRootDesigner
' This sample demonstrates how to provide the root designer view, or
' design mode background view, by overriding IRootDesigner.GetView().
' This sample component inherits from RootDesignedComponent which
' uses the SampleRootDesigner.
Public Class RootViewSampleComponent
Inherits RootDesignedComponent
Public Sub New()
End Sub
End Class
' The following attribute associates the SampleRootDesigner designer
' with the SampleComponent component.
<Designer(GetType(SampleRootDesigner), GetType(IRootDesigner))> _
Public Class RootDesignedComponent
Inherits Component
Public Sub New()
End Sub
End Class
Public Class SampleRootDesigner
Inherits ComponentDesigner
Implements IRootDesigner
' Member field of custom type RootDesignerView, a control that
' will be shown in the Forms designer view. This member is
' cached to reduce processing needed to recreate the
' view control on each call to GetView().
Private m_view As RootDesignerView
' This method returns an instance of the view for this root
' designer. The "view" is the user interface that is presented
' in a document window for the user to manipulate.
Function GetView(ByVal technology As ViewTechnology) As Object Implements IRootDesigner.GetView
If Not technology = ViewTechnology.Default Then
Throw New ArgumentException("Not a supported view technology", "technology")
End If
If m_view Is Nothing Then
' Some type of displayable Form or control is required for a root designer that overrides
' GetView(). In this example, a Control of type RootDesignerView is used.
' Any class that inherits from Control will work.
m_view = New RootDesignerView(Me)
End If
Return m_view
End Function
' IRootDesigner.SupportedTechnologies is a required override for an
' IRootDesigner. Default is the view technology used by this designer.
ReadOnly Property SupportedTechnologies() As ViewTechnology() Implements IRootDesigner.SupportedTechnologies
Get
Return New ViewTechnology() {ViewTechnology.Default}
End Get
End Property
' RootDesignerView is a simple control that will be displayed
' in the designer window.
Private Class RootDesignerView
Inherits Control
Private m_designer As SampleRootDesigner
Public Sub New(ByVal designer As SampleRootDesigner)
m_designer = designer
BackColor = Color.Blue
Font = New Font(Font.FontFamily.Name, 24.0F)
End Sub
Protected Overrides Sub OnPaint(ByVal pe As PaintEventArgs)
MyBase.OnPaint(pe)
' Draws the name of the component in large letters.
Dim rf As New RectangleF(ClientRectangle.X, ClientRectangle.Y, ClientRectangle.Width, ClientRectangle.Height)
pe.Graphics.DrawString(m_designer.Component.Site.Name, Font, Brushes.Yellow, rf)
End Sub
End Class
End Class
End Namespace
A root designer is the designer that is in the top position, or root, of the current design-time document object hierarchy. A root designer must implement the IRootDesigner interface. A root designer typically manages the background view in designer view mode, and usually displays the controls within the base container of the current design time project.
Component |
Gets the base component that this designer is designing. (Inherited from IDesigner) |
Supported |
Gets the set of technologies that this designer can support for its display. |
Verbs |
Gets a collection of the design-time verbs supported by the designer. (Inherited from IDesigner) |
Dispose() |
Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources. (Inherited from IDisposable) |
Do |
Performs the default action for this designer. (Inherited from IDesigner) |
Get |
Gets a view object for the specified view technology. |
Initialize(IComponent) |
Initializes the designer with the specified component. (Inherited from IDesigner) |
Product | Versions |
---|---|
.NET | Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 2.0, 2.1 |
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