EditableDesignerRegion Class

Definition

public ref class EditableDesignerRegion : System::Web::UI::Design::DesignerRegion

public class EditableDesignerRegion : System.Web.UI.Design.DesignerRegion

type EditableDesignerRegion = class
    inherit DesignerRegion

Public Class EditableDesignerRegion
Inherits DesignerRegion

Inheritance

Object

DesignerObject

DesignerRegion

EditableDesignerRegion

Derived

System.Web.UI.Design.TemplatedEditableDesignerRegion

System.Web.UI.Design.WebControls.WizardStepEditableRegion

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

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

Properties

Methods

Explicit Interface Implementations

Applies to

See also

• ControlDesigner
• GetEditableDesignerRegionContent(EditableDesignerRegion)
• Extending Design-Time Support
• How to: Extend the Appearance and Behavior of Controls in Design Mode