EditableDesignerRegion Class
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Represents an editable content region within the design-time markup for the associated control.
public ref class EditableDesignerRegion : System::Web::UI::Design::DesignerRegionpublic class EditableDesignerRegion : System.Web.UI.Design.DesignerRegiontype EditableDesignerRegion = class
inherit DesignerRegionPublic Class EditableDesignerRegion
Inherits DesignerRegion- Inheritance
- Derived
Examples
This example shows how to create a control with two clickable regions and an EditableDesignerRegion object with two views, or templates. Compile the project, then open the page in a visual designer and switch to design (WYSIWYG) view. There are two clickable views, View1 and View2. Click View1 and drag the CheckBox control from the lower part of the page into the empty designer region just below the clickable regions. Click View2 and drag the RadioButton control into the empty designer region. Click View1 again, and the region with the CheckBox reappears. Click View2 and the region with the RadioButton reappears. Switch back to source view to see how your changes are persisted in the HTML markup
Note
Your project must have a reference to the System.Design.dll assembly.
using System;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Drawing;
using System.Web.UI;
using System.Web.UI.Design;
using System.Web.UI.Design.WebControls;
using System.Web.UI.WebControls;
namespace Samples.ASPNet.ControlDesigners_CS
{
[
Designer(typeof(MyMultiRegionControlDesigner)),
ToolboxData("<{0}:MyMultiRegionControl runat=\"server\" width=\"200\"></{0}:MyMultiRegionControl>")
]
public class MyMultiRegionControl : CompositeControl
{
// Define the templates that represent 2 views on the control
private ITemplate _view1;
private ITemplate _view2;
// Create persistable inner properties
// for the two editable views
[PersistenceMode(PersistenceMode.InnerProperty), DefaultValue(null)]
public virtual ITemplate View1
{
get { return _view1; }
set { _view1 = value; }
}
[PersistenceMode(PersistenceMode.InnerProperty), DefaultValue(null)]
public virtual ITemplate View2
{
get { return _view2; }
set { _view2 = value; }
}
// The current view on the control; 0 = view1, 1 = view2
private int _currentView = 0;
public int CurrentView
{
get { return _currentView; }
set { _currentView = value; }
}
// Create a simple table with a row of two clickable,
// readonly headers and a row with a single column, which
// is the 'container' to which we'll be adding controls.
protected override void CreateChildControls()
{
// Always start with a clean form
Controls.Clear();
// Create a table using the control's declarative properties
Table t = new Table();
t.CellSpacing = 1;
t.BorderStyle = BorderStyle;
t.Width = this.Width;
t.Height = this.Height;
// Create the header row
TableRow tr = new TableRow();
tr.HorizontalAlign = HorizontalAlign.Center;
tr.BackColor = Color.LightBlue;
// Create the first cell in the header row
TableCell tc = new TableCell();
tc.Text = "View 1";
tc.Width = new Unit("50%");
tr.Cells.Add(tc);
// Create the second cell in the header row
tc = new TableCell();
tc.Text = "View 2";
tc.Width = new Unit("50%");
tr.Cells.Add(tc);
t.Rows.Add(tr);
// Create the second row for content
tr = new TableRow();
tr.HorizontalAlign = HorizontalAlign.Center;
// This cell represents our content 'container'
tc = new TableCell();
tc.ColumnSpan = 2;
// Add the current view content to the cell
// at run-time
if (!DesignMode)
{
Control containerControl = new Control();
switch (CurrentView)
{
case 0:
if (View1 != null)
View1.InstantiateIn(containerControl);
break;
case 1:
if (View2 != null)
View2.InstantiateIn(containerControl);
break;
}
tc.Controls.Add(containerControl);
}
tr.Cells.Add(tc);
t.Rows.Add(tr);
// Add the finished table to the Controls collection
Controls.Add(t);
}
}
//---------------------------------------------------------
// Region-based control designer for the above web control,
// derived from CompositeControlDesigner.
public class MyMultiRegionControlDesigner : CompositeControlDesigner
{
private MyMultiRegionControl myControl;
public override void Initialize(IComponent component)
{
base.Initialize(component);
myControl = (MyMultiRegionControl)component;
}
// Make this control resizeable on the design surface
public override bool AllowResize
{
get
{
return true;
}
}
// Use the base to create child controls, then add region markers
protected override void CreateChildControls() {
base.CreateChildControls();
// Get a reference to the table, which is the first child control
Table t = (Table)myControl.Controls[0];
// Add design time markers for each of the three regions
if (t != null)
{
// View1
t.Rows[0].Cells[0].Attributes[DesignerRegion.DesignerRegionAttributeName] = "0";
// View2
t.Rows[0].Cells[1].Attributes[DesignerRegion.DesignerRegionAttributeName] = "1";
// Editable region
t.Rows[1].Cells[0].Attributes[DesignerRegion.DesignerRegionAttributeName] = "2";
}
}
// Handler for the Click event, which provides the region in the arguments.
protected override void OnClick(DesignerRegionMouseEventArgs e)
{
if (e.Region == null)
return;
// If the clicked region is not a header, return
if (e.Region.Name.IndexOf("Header") != 0)
return;
// Switch the current view if required
if (e.Region.Name.Substring(6, 1) != myControl.CurrentView.ToString())
{
myControl.CurrentView = int.Parse(e.Region.Name.Substring(6, 1));
base.UpdateDesignTimeHtml();
}
}
// Create the regions and design-time markup. Called by the designer host.
public override String GetDesignTimeHtml(DesignerRegionCollection regions) {
// Create 3 regions: 2 clickable headers and an editable row
regions.Add(new DesignerRegion(this, "Header0"));
regions.Add(new DesignerRegion(this, "Header1"));
// Create an editable region and add it to the regions
EditableDesignerRegion editableRegion =
new EditableDesignerRegion(this,
"Content" + myControl.CurrentView, false);
regions.Add(editableRegion);
// Set the highlight for the selected region
regions[myControl.CurrentView].Highlight = true;
// Use the base class to render the markup
return base.GetDesignTimeHtml();
}
// Get the content string for the selected region. Called by the designer host?
public override string GetEditableDesignerRegionContent(EditableDesignerRegion region)
{
// Get a reference to the designer host
IDesignerHost host = (IDesignerHost)Component.Site.GetService(typeof(IDesignerHost));
if (host != null)
{
ITemplate template = myControl.View1;
if (region.Name == "Content1")
template = myControl.View2;
// Persist the template in the design host
if (template != null)
return ControlPersister.PersistTemplate(template, host);
}
return String.Empty;
}
// Create a template from the content string and
// put it in the selected view.
public override void SetEditableDesignerRegionContent(EditableDesignerRegion region, string content)
{
if (content == null)
return;
// Get a reference to the designer host
IDesignerHost host = (IDesignerHost)Component.Site.GetService(typeof(IDesignerHost));
if (host != null)
{
// Create a template from the content string
ITemplate template = ControlParser.ParseTemplate(host, content);
// Determine which region should get the template
// Either 'Content0' or 'Content1'
if (region.Name.EndsWith("0"))
myControl.View1 = template;
else if (region.Name.EndsWith("1"))
myControl.View2 = template;
}
}
}
}
Imports System.ComponentModel
Imports System.ComponentModel.Design
Imports System.Drawing
Imports System.Web.UI
Imports System.Web.UI.Design
Imports System.Web.UI.Design.WebControls
Imports System.Web.UI.WebControls
Namespace Samples.ASPNet.ControlDesigners_VB
< _
Designer(GetType(MyMultiRegionControlDesigner)), _
ToolboxData("<{0}:MyMultiRegionControl runat=""server"" width=""200""></{0}:MyMultiRegionControl>") _
> _
Public Class MyMultiRegionControl
Inherits CompositeControl
' Define the templates that represent 2 views on the control
Private _view1 As ITemplate
Private _view2 As ITemplate
' The current view on the control; 0 = view1, 1 = view2
Private _currentView As Integer = 0
' Create persistable inner properties
<PersistenceMode(PersistenceMode.InnerProperty), DefaultValue(CType(Nothing, ITemplate))> _
Public Overridable Property View1() As ITemplate
Get
Return _view1
End Get
Set(ByVal value As ITemplate)
_view1 = value
End Set
End Property
<PersistenceMode(PersistenceMode.InnerProperty), DefaultValue(CType(Nothing, ITemplate))> _
Public Overridable Property View2() As ITemplate
Get
Return _view2
End Get
Set(ByVal value As ITemplate)
_view2 = value
End Set
End Property
Public Property CurrentView() As Integer
Get
Return _currentView
End Get
Set(ByVal value As Integer)
_currentView = value
End Set
End Property
' Create a simple table with a row of two clickable,
' readonly headers and a row with a single column, which
' is the 'container' to which we'll be adding controls.
Protected Overrides Sub CreateChildControls()
' Start with a clean form
Controls.Clear()
' Create a table
Dim t As New Table()
t.CellSpacing = 1
t.BorderStyle = BorderStyle
t.Width = Me.Width
t.Height = Me.Height
' Create the header row
Dim tr As New TableRow()
tr.HorizontalAlign = HorizontalAlign.Center
tr.BackColor = Color.LightBlue
' Create the first cell in the header row
Dim tc As New TableCell()
tc.Text = "View 1"
tc.Width = New Unit("50%")
tr.Cells.Add(tc)
' Create the second cell in the header row
tc = New TableCell()
tc.Text = "View 2"
tc.Width = New Unit("50%")
tr.Cells.Add(tc)
t.Rows.Add(tr)
' Create the second row for content
tr = New TableRow()
tr.HorizontalAlign = HorizontalAlign.Center
' This cell represents our content 'container'
tc = New TableCell()
tc.ColumnSpan = 2
' Add the current view content to the cell
' at run-time
If Not DesignMode Then
Dim containerControl As New Control()
Select Case CurrentView
Case 0
If Not (View1 Is Nothing) Then
View1.InstantiateIn(containerControl)
End If
Case 1
If Not (View2 Is Nothing) Then
View2.InstantiateIn(containerControl)
End If
End Select
tc.Controls.Add(containerControl)
End If
tr.Cells.Add(tc)
t.Rows.Add(tr)
' Add the finished table to the Controls collection
Controls.Add(t)
End Sub
End Class
' Region-based control designer for the above web control.
' This is derived from CompositeControlDesigner.
Public Class MyMultiRegionControlDesigner
Inherits CompositeControlDesigner
Private myControl As MyMultiRegionControl
Public Overrides Sub Initialize(ByVal component As IComponent)
MyBase.Initialize(component)
myControl = CType(component, MyMultiRegionControl)
End Sub
' Make this control resizeable on the design surface
Public Overrides ReadOnly Property AllowResize() As Boolean
Get
Return True
End Get
End Property
' Use the base to create child controls, then add region markers
Protected Overrides Sub CreateChildControls()
MyBase.CreateChildControls()
' Get a reference to the table, which is the first child control
Dim t As Table
t = CType(myControl.Controls(0), Table)
' Add design time markers for each of the three regions
If Not IsNothing(t) Then
' View1
t.Rows(0).Cells(0).Attributes(DesignerRegion.DesignerRegionAttributeName) = "0"
' View2
t.Rows(0).Cells(1).Attributes(DesignerRegion.DesignerRegionAttributeName) = "1"
' Editable region
t.Rows(1).Cells(0).Attributes(DesignerRegion.DesignerRegionAttributeName) = "2"
End If
End Sub
' Handler for the Click event, which provides the region in the arguments.
Protected Overrides Sub OnClick(ByVal e As DesignerRegionMouseEventArgs)
If IsNothing(e.Region) Then
Return
End If
' If the clicked region is not a header, return
If e.Region.Name.IndexOf("Header") <> 0 Then
Return
End If
' Switch the current view if required
If e.Region.Name.Substring(6, 1) <> myControl.CurrentView.ToString() Then
myControl.CurrentView = Integer.Parse(e.Region.Name.Substring(6, 1))
MyBase.UpdateDesignTimeHtml()
End If
End Sub
' Create the regions and design-time markup. Called by the designer host.
Public Overrides Function GetDesignTimeHtml(ByVal regions As DesignerRegionCollection) As String
' Create 3 regions: 2 clickable headers and an editable row
regions.Add(New DesignerRegion(Me, "Header0"))
regions.Add(New DesignerRegion(Me, "Header1"))
' Create an editable region and add it to the regions
Dim editableRegion As EditableDesignerRegion = _
New EditableDesignerRegion(Me, _
"Content" & myControl.CurrentView, False)
regions.Add(editableRegion)
' Set the highlight for the selected region
regions(myControl.CurrentView).Highlight = True
' Use the base class to render the markup
Return MyBase.GetDesignTimeHtml()
End Function
' Get the content string for the selected region. Called by the designer host?
Public Overrides Function GetEditableDesignerRegionContent(ByVal region As EditableDesignerRegion) As String
' Get a reference to the designer host
Dim host As IDesignerHost = CType(Component.Site.GetService(GetType(IDesignerHost)), IDesignerHost)
If Not IsNothing(host) Then
Dim template As ITemplate = myControl.View1
If region.Name = "Content1" Then
template = myControl.View2
End If
' Persist the template in the design host
If Not IsNothing(template) Then
Return ControlPersister.PersistTemplate(template, host)
End If
End If
Return String.Empty
End Function
' Create a template from the content string and put it
' in the selected view. Called by the designer host?
Public Overrides Sub SetEditableDesignerRegionContent(ByVal region As EditableDesignerRegion, ByVal content As String)
If IsNothing(content) Then
Return
End If
' Get a reference to the designer host
Dim host As IDesignerHost = CType(Component.Site.GetService(GetType(IDesignerHost)), IDesignerHost)
If Not IsNothing(host) Then
' Create a template from the content string
Dim template As ITemplate = ControlParser.ParseTemplate(host, content)
' Determine which region should get the template
If region.Name.EndsWith("0") Then
myControl.View1 = template
ElseIf region.Name.EndsWith("1") Then
myControl.View2 = template
End If
End If
End Sub
End Class
End Namespace
<%@ Page Language="C#" %>
<%@ Register TagPrefix="aspSample"
Assembly="Samples.ASPNet.ControlDesigners_CS"
Namespace="Samples.ASPNet.ControlDesigners_CS" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Designers Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<aspSample:MyMultiRegionControl ID="myCtl" Runat=Server Width=200 Height=75 BorderStyle=solid >
</aspSample:MyMultiRegionControl><br />
<asp:CheckBox ID="CheckBox1" runat="server" />
<asp:RadioButton ID="RadioButton1" runat="server" />
</div>
</form>
</body>
</html>
<%@ Page Language="VB" %>
<%@ Register TagPrefix="aspSample"
Assembly="Samples.ASPNet.ControlDesigners_VB"
Namespace="Samples.ASPNet.ControlDesigners_VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Designers Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<aspSample:MyMultiRegionControl ID="myCtl" Runat=Server Width=200 Height=75 BorderStyle=solid >
</aspSample:MyMultiRegionControl><br />
<asp:CheckBox ID="CheckBox1" runat="server" />
<asp:RadioButton ID="RadioButton1" runat="server" />
</div>
</form>
</body>
</html>
Remarks
Use the EditableDesignerRegion class to help manage templates at design time. A ControlDesigner will use an instance of this class with its GetEditableDesignerRegionContent method to generate HTML markup of the region's content.
Constructors
| EditableDesignerRegion(ControlDesigner, String, Boolean) |
Creates a new instance of the EditableDesignerRegion class using the given owner and name and the initial value of the ServerControlsOnly property. |
| EditableDesignerRegion(ControlDesigner, String) |
Initializes a new instance of the EditableDesignerRegion class using the given owner and name. |
Properties
| Content |
Gets or sets the HTML markup for the content of the region. |
| Description |
Gets or sets the description for a designer region. (Inherited from DesignerRegion) |
| Designer |
Gets the associated designer component. (Inherited from DesignerObject) |
| DisplayName |
Gets or sets the friendly display name for a designer region. (Inherited from DesignerRegion) |
| EnsureSize |
Gets or sets a value indicating whether the region size is to be explicitly set on the designer region by the design host. (Inherited from DesignerRegion) |
| Highlight |
Gets or sets a value indicating whether to highlight the designer region on the design surface. (Inherited from DesignerRegion) |
| Name |
Gets the name of the object. (Inherited from DesignerObject) |
| Properties |
Gets the object's properties. (Inherited from DesignerObject) |
| Selectable |
Gets or sets a value indicating whether the designer region can be selected by the user on the design surface. (Inherited from DesignerRegion) |
| Selected |
Gets or sets a value indicating whether the designer region is currently selected on the design surface. (Inherited from DesignerRegion) |
| ServerControlsOnly |
Gets or sets a value indicating whether the region can accept only Web server controls. |
| SupportsDataBinding |
Gets or sets a value indicating whether the region can be bound to a data source. |
| UserData |
Gets or sets optional user data to associate with the designer region. (Inherited from DesignerRegion) |
Methods
| Equals(Object) |
Determines whether the specified object is equal to the current object. (Inherited from Object) |
| GetBounds() |
Retrieves the size of the designer region on the design surface. (Inherited from DesignerRegion) |
| GetChildViewRendering(Control) |
Returns a ViewRendering object containing the design-time HTML markup for the given control. |
| GetHashCode() |
Serves as the default hash function. (Inherited from Object) |
| GetService(Type) |
Gets a service from the design host, as identified by the provided type. (Inherited from DesignerObject) |
| GetType() |
Gets the Type of the current instance. (Inherited from Object) |
| MemberwiseClone() |
Creates a shallow copy of the current Object. (Inherited from Object) |
| ToString() |
Returns a string that represents the current object. (Inherited from Object) |
Explicit Interface Implementations
| IServiceProvider.GetService(Type) |
For a description of this member, see GetService(Type). (Inherited from DesignerObject) |
Applies to
See also
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