CatalogPartChrome Class

Reference

Definition

Namespace:: System.Web.UI.WebControls.WebParts

Assembly:: System.Web.dll

Important

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Enables developers to override the rendering for only the selected sections of CatalogPart controls in a CatalogZoneBase zone.

public ref class CatalogPartChrome

public class CatalogPartChrome

type CatalogPartChrome = class

Public Class CatalogPartChrome

Inheritance: Object
CatalogPartChrome

Examples

The following code example demonstrates how to use the CatalogPartChrome class to override the default rendering of CatalogPart controls in a CatalogZoneBase zone.

The code example has three parts:

A user control that enables you to change display modes on a Web Parts page.
A Web page that hosts all the controls in the example.
A class that contains the source code for a custom CatalogPartChrome class and CatalogZoneBase zone.

The first part of the code example is the user control. The source code for the user control comes from another topic. For this code example to work, you need to obtain the .ascx file for the user control from the Walkthrough: Changing Display Modes on a Web Parts Page topic, and place the file in the same folder as the .aspx page in this code example.

The second part of the example is the Web page. Note that there is a Register directive near the top of the file to register the compiled component and a tag prefix. Also note that the page references the custom catalog zone using the element <aspSample:MyCatalogZone>.

<%@ Page Language="C#" %>
<%@ register tagprefix="aspSample" 
  Namespace="Samples.AspNet.CS.Controls" %>
<%@ Register TagPrefix="uc1" TagName="DisplayModeMenuCS" Src="~/DisplayModeMenuCS.ascx" %>
<!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 id="Head1" runat="server">
  <title>Web Parts Page</title>
</head>
<body>
  <h1>Web Parts Demonstration Page</h1>
  <form runat="server" id="form1">
<asp:webpartmanager id="WebPartManager1" runat="server" />
<uc1:DisplayModeMenuCS runat="server" ID="DisplayModeMenu" />
  <br />
  <table cellspacing="0" cellpadding="0" border="0">
    <tr>
      <td valign="top">
    <asp:webpartzone id="SideBarZone" runat="server" 
        headertext="Sidebar">
        <zonetemplate>
        </zonetemplate>
      </asp:webpartzone>
      <aspSample:MyCatalogZone ID="CatalogZone1" runat="server">
      <ZoneTemplate>
          <asp:ImportCatalogPart ID="ImportCatalog" runat="server" />
      </ZoneTemplate>
    </aspSample:MyCatalogZone>
      </td>
      <td valign="top">
    <asp:webpartzone id="MainZone" runat="server" headertext="Main">
         <zonetemplate>
        <asp:label id="contentPart" runat="server" Title="Content">
              <h2>Welcome to My Home Page</h2>
              <p>Use links to visit my favorite sites!</p>
            </asp:label>
         </zonetemplate>
       </asp:webpartzone>
      </td>
      <td valign="top">
      </td>
    </tr>
  </table>
  </form>
</body>
</html>

<%@ Page Language="VB" %>
<%@ register tagprefix="aspSample" 
  Namespace="Samples.AspNet.VB.Controls" %>
<%@ Register TagPrefix="uc1" TagName="DisplayModeMenuVB" Src="~/DisplayModeMenuVB.ascx" %>
<!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 id="Head1" runat="server">
  <title>Web Parts Page</title>
</head>
<body>
  <h1>Web Parts Demonstration Page</h1>
  <form runat="server" id="form1">
<asp:webpartmanager id="WebPartManager1" runat="server" />
<uc1:DisplayModeMenuVB runat="server" ID="DisplayModeMenu" />
  <br />
  <table cellspacing="0" cellpadding="0" border="0">
    <tr>
      <td valign="top">
    <asp:webpartzone id="SideBarZone" runat="server" 
        headertext="Sidebar">
        <zonetemplate>
        </zonetemplate>
      </asp:webpartzone>
      <aspSample:MyCatalogZone ID="CatalogZone1" runat="server">
      <ZoneTemplate>
          <asp:ImportCatalogPart ID="ImportCatalog" runat="server" />
      </ZoneTemplate>
    </aspSample:MyCatalogZone>
      </td>
      <td valign="top">
    <asp:webpartzone id="MainZone" runat="server" headertext="Main">
         <zonetemplate>
        <asp:label id="contentPart" runat="server" Title="Content">
              <h2>Welcome to My Home Page</h2>
              <p>Use links to visit my favorite sites!</p>
            </asp:label>
         </zonetemplate>
       </asp:webpartzone>
      </td>
      <td valign="top">
      </td>
    </tr>
  </table>
  </form>
</body>
</html>

The third part of the example contains the implementation of the custom catalog part chrome and catalog part zone. MyCatalogZone extends CatalogZone and overrides CreateCatalogPartChrome to return the custom catalog part chrome. MyCatalogPartChrome changes the background color of the catalog control in the CreateCatalogPartChromeStyle method. The background color of the zone is changed in the PerformPreRender method, and text is added to the catalog part in the RenderPartContents method.

namespace Samples.AspNet.CS.Controls
{

    /// <summary>
    /// Summary description for source
    /// </summary>
    public class MyCatalogPartChrome : CatalogPartChrome
    {
        public MyCatalogPartChrome(CatalogZoneBase zone)
            : base(zone)
        {
        }

        protected override Style  CreateCatalogPartChromeStyle(CatalogPart catalogPart, PartChromeType chromeType)
        {
            Style catalogStyle = base.CreateCatalogPartChromeStyle(catalogPart, chromeType);
            catalogStyle.BackColor = Color.Bisque;
            return catalogStyle;
        }

        public override void PerformPreRender()
        {
            Style zoneStyle = new Style();
            zoneStyle.BackColor = Color.Cornsilk;

            Zone.Page.Header.StyleSheet.RegisterStyle(zoneStyle, null);
            Zone.MergeStyle(zoneStyle);
        }

        protected override void  RenderPartContents(HtmlTextWriter writer, CatalogPart catalogPart)
        {
            writer.AddStyleAttribute("color", "red");
            writer.RenderBeginTag("p");
            writer.Write("Apply all changes");
            writer.RenderEndTag();
            catalogPart.RenderControl(writer);
        }

        public override void  RenderCatalogPart(HtmlTextWriter writer, CatalogPart catalogPart)
        {
            base.RenderCatalogPart(writer, catalogPart);
        }
    }

    public class MyCatalogZone : CatalogZone
    {
        protected override CatalogPartChrome  CreateCatalogPartChrome()
        {
            return new MyCatalogPartChrome(this);
        }
    }
}

Namespace Samples.AspNet.VB.Controls


    Public Class MyCatalogPartChrome
        Inherits CatalogPartChrome

        Public Sub New(ByVal zone As CatalogZoneBase)
            MyBase.New(zone)
        End Sub

        Protected Overrides Function CreateCatalogPartChromeStyle(ByVal catalogPart As System.Web.UI.WebControls.WebParts.CatalogPart, ByVal chromeType As System.Web.UI.WebControls.WebParts.PartChromeType) As System.Web.UI.WebControls.Style
            Dim editorStyle As Style
            editorStyle = MyBase.CreateCatalogPartChromeStyle(catalogPart, chromeType)
            editorStyle.BackColor = Drawing.Color.Bisque
            Return editorStyle
        End Function

        Public Overrides Sub PerformPreRender()
            Dim zoneStyle As Style = New Style
            zoneStyle.BackColor = Drawing.Color.Cornsilk

            Zone.Page.Header.StyleSheet.RegisterStyle(zoneStyle, Nothing)
            Zone.MergeStyle(zoneStyle)
        End Sub

        Protected Overrides Sub RenderPartContents(ByVal writer As System.Web.UI.HtmlTextWriter, ByVal catalogPart As System.Web.UI.WebControls.WebParts.CatalogPart)
            writer.AddStyleAttribute("color", "red")
            writer.RenderBeginTag("p")
            writer.Write("Apply all changes")
            writer.RenderEndTag()
            catalogPart.RenderControl(writer)
        End Sub

        Public Overrides Sub RenderCatalogPart(ByVal writer As System.Web.UI.HtmlTextWriter, ByVal catalogPart As System.Web.UI.WebControls.WebParts.CatalogPart)
            MyBase.RenderCatalogPart(writer, catalogPart)
        End Sub
    End Class

    Public Class MyCatalogZone
        Inherits CatalogZone

        Protected Overrides Function CreateCatalogPartChrome() As System.Web.UI.WebControls.WebParts.CatalogPartChrome
            Return New MyCatalogPartChrome(Me)
        End Function
    End Class
End Namespace

Remarks

Chrome refers to the peripheral user interface (UI) elements that frame each Web Parts control or server control contained in a zone. The chrome for a control includes its border, its title bar, and the icons, title text, and verbs menu that appear within the title bar. The appearance of the chrome is set at the zone level, and applies to all the controls in the zone.

The Web Parts control set uses the CatalogPartChrome class to render the chrome for CatalogPart controls. Additionally, this class provides a way for developers to customize the rendering of any CatalogPart controls in a CatalogZoneBase zone. For example, you can override the CreateCatalogPartChromeStyle method to customize some specific style attributes applied to the CatalogZoneBase zone.

The CatalogPartChrome class contains several important methods that are useful when you want to override the rendering of CatalogPart controls. One is the CatalogPartChrome constructor, which you use when you override the CreateCatalogPartChrome method in a custom CatalogZoneBase zone to create an instance of your custom CatalogPartChrome object. Another useful method is the RenderPartContents method, which you can use to control the rendering of the content area of controls in a zone (as opposed to chrome elements such as headers, footers, and title bars). Finally, if you want complete programmatic control over all aspects of rendering the CatalogPart controls, you can override the RenderCatalogPart method.

Notes to Inheritors

If you inherit from the CatalogPartChrome class, you must create a customized CatalogZone zone to return your customized CatalogPartChrome class. The Example section for this class overview demonstrates how to create a customized CatalogZone zone to return a customized CatalogPartChrome class.

Constructors

CatalogPartChrome(CatalogZoneBase)

Initializes a new instance of the CatalogPartChrome class.

Properties

Zone	Gets a reference to the associated CatalogZoneBase zone.

Methods

CreateCatalogPartChromeStyle(CatalogPart, PartChromeType)	Creates the style object that supplies style attributes for each CatalogPart control rendered by the CatalogPartChrome object.
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetType()	Gets the Type of the current instance. (Inherited from Object)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
PerformPreRender()	Performs tasks that must be done prior to rendering CatalogPart controls.
RenderCatalogPart(HtmlTextWriter, CatalogPart)	Renders a complete CatalogPart control with all its sections.
RenderPartContents(HtmlTextWriter, CatalogPart)	Renders the main content area of a CatalogPart control, excluding the header and footer.
ToString()	Returns a string that represents the current object. (Inherited from Object)

Applies to