業(yè)務流程圖控件FlowChart.NET提供了用于創(chuàng)建或編輯圖表的直觀的用戶交互模型。在前面的教程中，探討了如何創(chuàng)建復合節(jié)點和組件。在本文中將會給出一部分內容關于創(chuàng)建一個自定義的CompositeNode 類，用于顯示在組織中的獨立信息，如名稱、 說明和圖像。節(jié)點將會通過各種公開的屬性進行自定義。

1、聲明的自定義類

    創(chuàng)建一個從CompositeNode 類派生的自定義復合節(jié)點，需要先進行聲明：

C#

public class OrgChartNode : CompositeNode
{
}

Visual Basic

Public Class OrgChartNode
    Inherits CompositeNode

End Class

 ;   可應用在不同的方案中創(chuàng)建一個自定義節(jié)點，比如，如果你想要定義在XML中的節(jié)點的內容，還想要聲明對于不同組件的事件處理程序，或是你想要應用自定義組件安排邏輯或是自定義呈現。

2、指定組件的內容

     添加一個單獨的構造函數到新創(chuàng)建的節(jié)點類，將會使用到下面的內容：

C#

...
public OrgChartNode(Diagram diagram) : base(diagram)
{
    string content = @"
      <SimplePanel>

        <Shape Name=""Shape"" Shape=""Rectangle"" />

          <Border Padding=""2"">
            <GridPanel>
              <GridPanel.Columns>
              <GridColumn Width=""30"" />
              <GridColumn />
            </GridPanel.Columns>
            <GridPanel.Rows>
              <GridRow />
            </GridPanel.Rows>

            <Image Name=""Image"" ImageAlign=""Fit"" />

            <StackPanel Orientation=""Vertical"" GridColumn=""1"">
              <Text Name=""Title"" Font=""Arial, 12pt, style=Bold"" TextAlignment=""Near"" />
              <Text Name=""FullName"" TextColor=""Blue"" TextAlignment=""Near"" />
              <Text Name=""Text"" Font=""Arial, 8pt"" TextAlignment=""Near"" />
            </StackPanel>
          </GridPanel>
        </Border>

      </SimplePanel>";

    Components.Add(XmlLoader.Load(content, null, null));
}
...

Visual Basic

...
Public Sub New(ByVal diagram As Diagram)

    MyBase.new(diagram)

    Dim content As String = _
        "<SimplePanel>" & _
        "" & _
        "  <Shape Name=""Shape"" Shape=""Rectangle"" />" & _
        "" & _
        "  <Border Padding=""2"">" & _
        "    <GridPanel>" & _
        "      <GridPanel.Columns>" & _
        "        <GridColumn Width=""30"" />" & _
        "        <GridColumn />" & _
        "      </GridPanel.Columns>" & _
        "      <GridPanel.Rows>" & _
        "        <GridRow />" & _
        "      </GridPanel.Rows>" & _
        "" & _
        "      <Image Name=""Image"" ImageAlign=""Fit"" />" & _
        "" & _
        "      <StackPanel Orientation=""Vertical"" GridColumn=""1"">" & _
        "        <Text Name=""Title"" Font=""Arial, 12pt, style=Bold"" TextAlignment=""Near"" />" & _
        "        <Text Name=""FullName"" TextColor=""Blue"" TextAlignment=""Near"" />" & _
        "        <Text Name=""Text"" Font=""Arial, 8pt"" TextAlignment=""Near"" />" & _
        "      </StackPanel>" & _
        "    </GridPanel>" & _
        "  </Border>" & _
        "" & _
        "</SimplePanel>"

    Components.Add(XmlLoader.Load(content, Nothing, Nothing))

End Sub
...

3、聲明組件字段

現在節(jié)點的內容已經定義好和導入了，將添加幾個字段到指定到感興趣的不同組件的類上，添加下面的字段到類的最后：

C#

private ShapeComponent shape;
private ImageComponent image;
private TextComponent title;
private TextComponent fullName;
private TextComponent text;

Visual Basic

Private _shape As ShapeComponent
Private _image As ImageComponent
Private _title As TextComponent
Private _fullName As TextComponent
Private _text As TextComponent

     要初始化引用相應組件的字段，可以使用CompositeNode 類的FindComponent方法。在組件太能極愛到節(jié)點的組件連接之后，這個方法將會成功的運行。在組件連接到復合節(jié)點之后，在函數中添加下面的代碼：

C#

...
Components.Add(XmlLoader.Load(content, null, null));

shape = FindComponent("Shape") as ShapeComponent;
image = FindComponent("Image") as ImageComponent;
title = FindComponent("Title") as TextComponent;
fullName = FindComponent("FullName") as TextComponent;
text = FindComponent("Text") as TextComponent;
...

Visual Basic

...
Components.Add(XmlLoader.Load(content, Nothing, Nothing))

_shape = CType(FindComponent("Shape"), ShapeComponent)
_image = CType(FindComponent("Image"), ImageComponent)
_title = CType(FindComponent("Title"), TextComponent)
_fullName = CType(FindComponent("FullName"), TextComponent)
_text = CType(FindComponent("Text"), TextComponent)
...