TreeNodeStyle Class

Reference

Definition

Namespace:: System.Web.UI.WebControls

Assembly:: System.Web.dll

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 the style of a node in the TreeView control.

public ref class TreeNodeStyle sealed : System::Web::UI::WebControls::Style

public sealed class TreeNodeStyle : System.Web.UI.WebControls.Style

type TreeNodeStyle = class
    inherit Style

Public NotInheritable Class TreeNodeStyle
Inherits Style

Inheritance: Object

MarshalByRefObject

Component

Style
TreeNodeStyle

Examples

The following code example demonstrates how to control the appearance of the parent nodes in the TreeView control by setting the style properties of the TreeNodeStyle object that is returned from the ParentNodeStyle property.


<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  void HorizontalPadding_Changed(Object sender, EventArgs e)
  {

    // Programmatically set the HorizontalPadding property based on the 
    // user's selection.
    ItemsTreeView.ParentNodeStyle.HorizontalPadding = Convert.ToInt32(HorizontalPaddingList.SelectedItem.Text);

  }

  void VerticalPadding_Changed(Object sender, EventArgs e)
  {

    // Programmatically set the VerticalPadding property based on the 
    // user's selection.
    ItemsTreeView.ParentNodeStyle.VerticalPadding = Convert.ToInt32(VerticalPaddingList.SelectedItem.Text);

  }

  void NodeSpacing_Changed(Object sender, EventArgs e)
  {

    // Programmatically set the NodeSpacing property based on the 
    // user's selection.
    ItemsTreeView.ParentNodeStyle.NodeSpacing = Convert.ToInt32(NodeSpacingList.SelectedItem.Text);

  }

  void ChildNodePadding_Changed(Object sender, EventArgs e)
  {

    // Programmatically set the ChildNodesPadding property based on the 
    // user's selection.
    ItemsTreeView.ParentNodeStyle.ChildNodesPadding = Convert.ToInt32(ChildNodesPaddingList.SelectedItem.Text);

  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>TreeNodeStyle Example</title>
</head>
<body>  
    <form id="form1" runat="server">
    
      <h3>TreeNodeStyle Example</h3>
      
      <!-- Set the styles for the leaf nodes declaratively. -->
      <asp:TreeView id="ItemsTreeView"
        Font-Names= "Arial"
        ForeColor="Blue"
        ParentNodeStyle-ForeColor="Green"
        ParentNodeStyle-HorizontalPadding="5" 
        ParentNodeStyle-VerticalPadding="5"  
        ParentNodeStyle-NodeSpacing="5"
        ParentNodeStyle-ChildNodesPadding="5"
        ExpandDepth="4"  
        runat="server">
         
        <Nodes>
        
          <asp:TreeNode Text="Table of Contents"
            SelectAction="None">
             
            <asp:TreeNode Text="Chapter One">
            
              <asp:TreeNode Text="Section 1.0">
              
                <asp:TreeNode Text="Topic 1.0.1"/>
                <asp:TreeNode Text="Topic 1.0.2"/>
                <asp:TreeNode Text="Topic 1.0.3"/>
              
              </asp:TreeNode>
              
              <asp:TreeNode Text="Section 1.1">
              
                <asp:TreeNode Text="Topic 1.1.1"/>
                <asp:TreeNode Text="Topic 1.1.2"/>
                <asp:TreeNode Text="Topic 1.1.3"/>
                <asp:TreeNode Text="Topic 1.1.4"/>
              
              </asp:TreeNode>
            
            </asp:TreeNode>
            
          </asp:TreeNode>
        
        </Nodes>
        
      </asp:TreeView>
      
      <hr />
      
      <h5>Select the style settings for the parent nodes.</h5>
      
      <table cellpadding="5">
      
        <tr align="right">
        
          <td>
          
            Horizontal Padding:
          
            <asp:DropDownList id="HorizontalPaddingList"
              AutoPostBack="true"
              OnSelectedIndexChanged="HorizontalPadding_Changed" 
              runat="server">
              
              <asp:ListItem>0</asp:ListItem>
              <asp:ListItem Selected="true">5</asp:ListItem>
              <asp:ListItem>10</asp:ListItem>
              
            </asp:DropDownList> 
          
          </td>
          
          <td>
          
            Vertical Padding:
          
            <asp:DropDownList id="VerticalPaddingList"
              AutoPostBack="true"
              OnSelectedIndexChanged="VerticalPadding_Changed" 
              runat="server">
              
              <asp:ListItem>0</asp:ListItem>
              <asp:ListItem Selected="true">5</asp:ListItem>
              <asp:ListItem>10</asp:ListItem>
              
            </asp:DropDownList> 
          
          </td>
          
        </tr>
        
        <tr align="right">
        
          <td>
          
            Node Spacing:
          
            <asp:DropDownList id="NodeSpacingList"
              AutoPostBack="true"
              OnSelectedIndexChanged="NodeSpacing_Changed"   
              runat="server">
              
              <asp:ListItem>0</asp:ListItem>
              <asp:ListItem Selected="true">5</asp:ListItem>
              <asp:ListItem>10</asp:ListItem>
              
            </asp:DropDownList> 
          
          </td>
          
          <td>
          
            Child Nodes Padding:
          
            <asp:DropDownList id="ChildNodesPaddingList"
              AutoPostBack="true"
              OnSelectedIndexChanged="ChildNodePadding_Changed"  
              runat="server">
              
              <asp:ListItem>0</asp:ListItem>
              <asp:ListItem Selected="true">5</asp:ListItem>
              <asp:ListItem>10</asp:ListItem>
              
            </asp:DropDownList> 
          
          </td>
        
        </tr>
      
      </table>
       
    </form>
  </body>
</html>


<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  Sub HorizontalPadding_Changed(ByVal sender As Object, ByVal e As EventArgs)

    ' Programmatically set the HorizontalPadding property based on the 
    ' user's selection.
    ItemsTreeView.ParentNodeStyle.HorizontalPadding = Convert.ToInt32(HorizontalPaddingList.SelectedItem.Text)

  End Sub

  Sub VerticalPadding_Changed(ByVal sender As Object, ByVal e As EventArgs)

    ' Programmatically set the VerticalPadding property based on the 
    ' user's selection.
    ItemsTreeView.ParentNodeStyle.VerticalPadding = Convert.ToInt32(VerticalPaddingList.SelectedItem.Text)

  End Sub

  Sub NodeSpacing_Changed(ByVal sender As Object, ByVal e As EventArgs)

    ' Programmatically set the NodeSpacing property based on the 
    ' user's selection.
    ItemsTreeView.ParentNodeStyle.NodeSpacing = Convert.ToInt32(NodeSpacingList.SelectedItem.Text)

  End Sub

  Sub ChildNodePadding_Changed(ByVal sender As Object, ByVal e As EventArgs)

    ' Programmatically set the ChildNodesPadding property based on the 
    ' user's selection.
    ItemsTreeView.ParentNodeStyle.ChildNodesPadding = Convert.ToInt32(ChildNodesPaddingList.SelectedItem.Text)

  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>TreeNodeStyle Example</title>
</head>
<body>  
    <form id="form1" runat="server">
    
      <h3>TreeNodeStyle Example</h3>
      
      <!-- Set the styles for the leaf nodes declaratively. -->
      <asp:TreeView id="ItemsTreeView"
        Font-Names= "Arial"
        ForeColor="Blue"
        ParentNodeStyle-ForeColor="Green"
        ParentNodeStyle-HorizontalPadding="5" 
        ParentNodeStyle-VerticalPadding="5"  
        ParentNodeStyle-NodeSpacing="5"
        ParentNodeStyle-ChildNodesPadding="5"
        ExpandDepth="4"  
        runat="server">
         
        <Nodes>
        
          <asp:TreeNode Text="Table of Contents"
            SelectAction="None">
             
            <asp:TreeNode Text="Chapter One">
            
              <asp:TreeNode Text="Section 1.0">
              
                <asp:TreeNode Text="Topic 1.0.1"/>
                <asp:TreeNode Text="Topic 1.0.2"/>
                <asp:TreeNode Text="Topic 1.0.3"/>
              
              </asp:TreeNode>
              
              <asp:TreeNode Text="Section 1.1">
              
                <asp:TreeNode Text="Topic 1.1.1"/>
                <asp:TreeNode Text="Topic 1.1.2"/>
                <asp:TreeNode Text="Topic 1.1.3"/>
                <asp:TreeNode Text="Topic 1.1.4"/>
              
              </asp:TreeNode>
            
            </asp:TreeNode>
            
          </asp:TreeNode>
        
        </Nodes>
        
      </asp:TreeView>
      
      <hr />
      
      <h5>Select the style settings for the parent nodes.</h5>
      
      <table cellpadding="5">
      
        <tr align="right">
        
          <td>
          
            Horizontal Padding:
          
            <asp:DropDownList id="HorizontalPaddingList"
              AutoPostBack="true"
              OnSelectedIndexChanged="HorizontalPadding_Changed" 
              runat="server">
              
              <asp:ListItem>0</asp:ListItem>
              <asp:ListItem Selected="true">5</asp:ListItem>
              <asp:ListItem>10</asp:ListItem>
              
            </asp:DropDownList> 
          
          </td>
          
          <td>
          
            Vertical Padding:
          
            <asp:DropDownList id="VerticalPaddingList"
              AutoPostBack="true"
              OnSelectedIndexChanged="VerticalPadding_Changed" 
              runat="server">
              
              <asp:ListItem>0</asp:ListItem>
              <asp:ListItem Selected="true">5</asp:ListItem>
              <asp:ListItem>10</asp:ListItem>
              
            </asp:DropDownList> 
          
          </td>
          
        </tr>
        
        <tr align="right">
        
          <td>
          
            Node Spacing:
          
            <asp:DropDownList id="NodeSpacingList"
              AutoPostBack="true"
              OnSelectedIndexChanged="NodeSpacing_Changed"   
              runat="server">
              
              <asp:ListItem>0</asp:ListItem>
              <asp:ListItem Selected="true">5</asp:ListItem>
              <asp:ListItem>10</asp:ListItem>
              
            </asp:DropDownList> 
          
          </td>
          
          <td>
          
            Child Nodes Padding:
          
            <asp:DropDownList id="ChildNodesPaddingList"
              AutoPostBack="true"
              OnSelectedIndexChanged="ChildNodePadding_Changed"  
              runat="server">
              
              <asp:ListItem>0</asp:ListItem>
              <asp:ListItem Selected="true">5</asp:ListItem>
              <asp:ListItem>10</asp:ListItem>
              
            </asp:DropDownList> 
          
          </td>
        
        </tr>
      
      </table>
       
    </form>
  </body>
</html>

Remarks

Use the TreeNodeStyle class to represent the style of a node in the TreeView control. The TreeView control allows you to specify different style characteristics (such as font size and color) for each of the different node types.

The following table lists the node styles that are supported by the TreeNodeStyle class.

Node style property	Description
HoverNodeStyle	The style settings for a node when the mouse pointer is positioned over it.
LeafNodeStyle	The style settings for the leaf nodes.
NodeStyle	The default style settings for a node.
ParentNodeStyle	The style settings for the parent nodes.
RootNodeStyle	The style settings for the root node.
SelectedNodeStyle	The style settings for a selected node.

When you set the node style properties of the TreeView control, they are applied in the following order:

NodeStyle.
RootNodeStyle, ParentNodeStyle, or LeafNodeStyle, depending on the node type.
LevelStyles.
SelectedNodeStyle.
HoverNodeStyle.

The TreeNodeStyle class inherits most of its members from the Style class. It extends the Style class by providing properties that control the amount of space around the text in a node, as well as the space between adjacent nodes. Use the HorizontalPadding property to control the amount of space to the left and right of the text in a node. Similarly, the VerticalPadding property controls the amount of space above and below the text in a node. You can control the amount of spacing between the node that the TreeNodeStyle is applied to and its adjacent nodes by setting the NodeSpacing property. To control the amount of spacing between a parent node and a child node, use the ChildNodesPadding property.

For more information about the inherited style settings, see Style.

Constructors

TreeNodeStyle()	Initializes a new instance of the TreeNodeStyle class.
TreeNodeStyle(StateBag)	Initializes a new instance of the TreeNodeStyle class with the specified StateBag object information.

Properties

BackColor	Gets or sets the background color of the Web server control. (Inherited from Style)
BorderColor	Gets or sets the border color of the Web server control. (Inherited from Style)
BorderStyle	Gets or sets the border style of the Web server control. (Inherited from Style)
BorderWidth	Gets or sets the border width of the Web server control. (Inherited from Style)
CanRaiseEvents	Gets a value indicating whether the component can raise an event. (Inherited from Component)
ChildNodesPadding	Gets or sets the amount of space between a parent node and a child node to which the TreeNodeStyle class is applied.
Container	Gets the IContainer that contains the Component. (Inherited from Component)
CssClass	Gets or sets the cascading style sheet (CSS) class rendered by the Web server control on the client. (Inherited from Style)
DesignMode	Gets a value that indicates whether the Component is currently in design mode. (Inherited from Component)
Events	Gets the list of event handlers that are attached to this Component. (Inherited from Component)
Font	Gets the font properties associated with the Web server control. (Inherited from Style)
ForeColor	Gets or sets the foreground color (typically the color of the text) of the Web server control. (Inherited from Style)
Height	Gets or sets the height of the Web server control. (Inherited from Style)
HorizontalPadding	Gets or sets the amount of space to the left and right of the text in the node.
ImageUrl	Gets or sets the URL to an image that is displayed next to the node.
IsEmpty	A protected property. Gets a value indicating whether any style elements have been defined in the state bag. (Inherited from Style)
IsTrackingViewState	Returns a value indicating whether any style elements have been defined in the state bag. (Inherited from Style)
NodeSpacing	Gets or sets the amount of vertical spacing between the node to which the TreeNodeStyle object is applied and its adjacent nodes.
RegisteredCssClass	Gets the cascading style sheet (CSS) class that is registered with the control. (Inherited from Style)
Site	Gets or sets the ISite of the Component. (Inherited from Component)
VerticalPadding	Gets or sets the amount of space above and below the text for a node.
ViewState	Gets the state bag that holds the style elements. (Inherited from Style)
Width	Gets or sets the width of the Web server control. (Inherited from Style)

Methods

AddAttributesToRender(HtmlTextWriter)	Adds HTML attributes and styles that need to be rendered to the specified HtmlTextWriter. This method is primarily used by control developers. (Inherited from Style)
AddAttributesToRender(HtmlTextWriter, WebControl)	Adds HTML attributes and styles that need to be rendered to the specified HtmlTextWriter and Web server control. This method is primarily used by control developers. (Inherited from Style)
CopyFrom(Style)	Copies the style properties of the specified Style object into the current TreeNodeStyle object.
CreateObjRef(Type)	Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object. (Inherited from MarshalByRefObject)
Dispose()	Releases all resources used by the Component. (Inherited from Component)
Dispose(Boolean)	Releases the unmanaged resources used by the Component and optionally releases the managed resources. (Inherited from Component)
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
FillStyleAttributes(CssStyleCollection, IUrlResolutionService)	Adds the specified object's style properties to a CssStyleCollection object. (Inherited from Style)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetLifetimeService()	Obsolete. Retrieves the current lifetime service object that controls the lifetime policy for this instance. (Inherited from MarshalByRefObject)
GetService(Type)	Returns an object that represents a service provided by the Component or by its Container. (Inherited from Component)
GetStyleAttributes(IUrlResolutionService)	Retrieves the CssStyleCollection object for the specified IUrlResolutionService-implemented object. (Inherited from Style)
GetType()	Gets the Type of the current instance. (Inherited from Object)
InitializeLifetimeService()	Obsolete. Obtains a lifetime service object to control the lifetime policy for this instance. (Inherited from MarshalByRefObject)
LoadViewState(Object)	Loads the previously saved state. (Inherited from Style)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
MemberwiseClone(Boolean)	Creates a shallow copy of the current MarshalByRefObject object. (Inherited from MarshalByRefObject)
MergeWith(Style)	Combines the style properties of the specified Style object with the style properties of the current TreeNodeStyle object.
Reset()	Returns the TreeNodeStyle object to its original state.
SaveViewState()	A protected method. Saves any state that has been modified after the TrackViewState() method was invoked. (Inherited from Style)
SetBit(Int32)	A protected internal method. Sets an internal bitmask field that indicates the style properties that are stored in the state bag. (Inherited from Style)
SetDirty()	Marks the Style so that its state will be recorded in view state. (Inherited from Style)
ToString()	Returns a string that represents the current object. (Inherited from Style)
TrackViewState()	A protected method. Marks the beginning for tracking state changes on the control. Any changes made after tracking has begun will be tracked and saved as part of the control view state. (Inherited from Style)

Events

Disposed

Occurs when the component is disposed by a call to the Dispose() method.

(Inherited from Component)

Explicit Interface Implementations

IStateManager.IsTrackingViewState	Gets a value that indicates whether a server control is tracking its view state changes. (Inherited from Style)
IStateManager.LoadViewState(Object)	Loads the previously saved state. (Inherited from Style)
IStateManager.SaveViewState()	Returns the object containing state changes. (Inherited from Style)
IStateManager.TrackViewState()	Starts tracking state changes. (Inherited from Style)

Applies to

Dela via