バージョン

ExpansionIndicatorImageExpanded プロパティ

ノードの展開された展開インジケータとして表示する画像を取得または設定します。
シンタックス
'宣言
 
Public Property ExpansionIndicatorImageExpanded As Image
public Image ExpansionIndicatorImageExpanded {get; set;}
解説

画像が指定される場合、その画像はツリーのノードの展開された展開インジケータとして使用されます。

画像が指定されない (null) の場合、DisplayStyle とテーマ化が使用可能かどうかに基づいてツリーは適切な展開インジケータを描画します。

画像を指定する時、ExpansionIndicatorSize プロパティを必ず画像のサイズに設定してください。

使用例
Imports Infragistics.Win.UltraWinTree


        ' Define the width and height of the expansion indicators. All of the images need to
        ' be the same size. 
        Const expansionIndicatorImageWidth As Integer = 15
        Const expansionIndicatorImageHeight As Integer = 15

        ' Set the ExpansionIndicatorSize on the tree.
        Me.ultraTree1.ExpansionIndicatorSize = New Size(expansionIndicatorImageWidth, expansionIndicatorImageHeight)

        ' Set the ExpansionIndicatorPadding.
        Me.ultraTree1.ExpansionIndicatorPadding = 3

        ' Tell the tree to hide the expansion indicators whenever the mouse is not over it. 
        Me.ultraTree1.HideExpansionIndicators = HideExpansionIndicators.OnMouseLeave

        ' Create a rect one pixel smaller than the size of the indicators. We will use this to 
        ' draw the ellipses in the indicator images so they don't get clipped. 
        Dim expansionIndicatorImageRect As Rectangle = New Rectangle(0, 0, expansionIndicatorImageWidth - 1, expansionIndicatorImageHeight - 1)

        ' Create a new bitmap for each state of the expansion indicators. 
        Dim expansionIndicatorImageCollapsed As Bitmap = New Bitmap(expansionIndicatorImageWidth, expansionIndicatorImageHeight)
        Dim expansionIndicatorImageExpanded As Bitmap = New Bitmap(expansionIndicatorImageWidth, expansionIndicatorImageHeight)
        Dim expansionIndicatorImageCollapsedHotTracked As Bitmap = New Bitmap(expansionIndicatorImageWidth, expansionIndicatorImageHeight)
        Dim expansionIndicatorImageExpandedHotTracked As Bitmap = New Bitmap(expansionIndicatorImageWidth, expansionIndicatorImageHeight)

        ' Draw the collapsed expansion indicator image.
        ' A red circle. 
        Dim g As Graphics = Nothing
        Try
            g = Graphics.FromImage(expansionIndicatorImageCollapsed)
            g.Clear(Color.Transparent)
            g.FillEllipse(Brushes.Red, expansionIndicatorImageRect)
        Finally
            If Not g Is Nothing Then
                g.Dispose()
            End If
        End Try

        ' Draw the expanded expansion indicator image.
        ' A green circle. 
        Try
            g = Graphics.FromImage(expansionIndicatorImageExpanded)
            g.Clear(Color.Transparent)
            g.FillEllipse(Brushes.Green, expansionIndicatorImageRect)
        Finally
            If Not g Is Nothing Then
                g.Dispose()
            End If
        End Try

        ' Draw the collapsed expansion indicator image.
        ' A red circle with a black border around it.
        Try
            g = Graphics.FromImage(expansionIndicatorImageCollapsedHotTracked)
            g.Clear(Color.Transparent)
            g.FillEllipse(Brushes.Red, expansionIndicatorImageRect)
            g.DrawEllipse(Pens.Black, expansionIndicatorImageRect)
        Finally
            If Not g Is Nothing Then
                g.Dispose()
            End If
        End Try

        ' Draw the collapsed expansion indicator image.
        ' A green circle with a black border around it. 
        Try
            g = Graphics.FromImage(expansionIndicatorImageExpandedHotTracked)
            g.Clear(Color.Transparent)
            g.FillEllipse(Brushes.Green, expansionIndicatorImageRect)
            g.DrawEllipse(Pens.Black, expansionIndicatorImageRect)
        Finally
            If Not g Is Nothing Then
                g.Dispose()
            End If
        End Try

        ' Assign the images to the tree. 
        Me.ultraTree1.ExpansionIndicatorImageCollapsed = expansionIndicatorImageCollapsed
        Me.ultraTree1.ExpansionIndicatorImageExpanded = expansionIndicatorImageExpanded
        Me.ultraTree1.ExpansionIndicatorImageCollapsedHotTracked = expansionIndicatorImageCollapsedHotTracked
        Me.ultraTree1.ExpansionIndicatorImageExpandedHotTracked = expansionIndicatorImageExpandedHotTracked
using Infragistics.Win.UltraWinTree;

            // Define the width and height of the expansion indicators. All of the images need to
            // be the same size. 
            const int expansionIndicatorImageWidth = 15;
            const int expansionIndicatorImageHeight = 15;

            // Set the ExpansionIndicatorSize on the tree.
            this.ultraTree1.ExpansionIndicatorSize = new Size(expansionIndicatorImageWidth, expansionIndicatorImageHeight);

            // Set the ExpansionIndicatorPadding.
            this.ultraTree1.ExpansionIndicatorPadding = 3;

            // Tell the tree to hide the expansion indicators whenever the mouse is not over it. 
            this.ultraTree1.HideExpansionIndicators = HideExpansionIndicators.OnMouseLeave;

            // Create a rect one pixel smaller than the size of the indicators. We will use this to 
            // draw the ellipses in the indicator images so they don't get clipped. 
            Rectangle expansionIndicatorImageRect = new Rectangle(0, 0, expansionIndicatorImageWidth-1, expansionIndicatorImageHeight-1);

            // Create a new bitmap for each state of the expansion indicators. 
            Bitmap expansionIndicatorImageCollapsed = new Bitmap(expansionIndicatorImageWidth, expansionIndicatorImageHeight);
            Bitmap expansionIndicatorImageExpanded = new Bitmap(expansionIndicatorImageWidth, expansionIndicatorImageHeight);
            Bitmap expansionIndicatorImageCollapsedHotTracked = new Bitmap(expansionIndicatorImageWidth, expansionIndicatorImageHeight);
            Bitmap expansionIndicatorImageExpandedHotTracked = new Bitmap(expansionIndicatorImageWidth, expansionIndicatorImageHeight);
            
            // Draw the collapsed expansion indicator image.
            // A red circle. 
            using(Graphics g = Graphics.FromImage(expansionIndicatorImageCollapsed))
            {
                g.Clear(Color.Transparent);
                g.FillEllipse(Brushes.Red, expansionIndicatorImageRect);
            }

            // Draw the expanded expansion indicator image.
            // A green circle. 
            using (Graphics g = Graphics.FromImage(expansionIndicatorImageExpanded))
            {
                g.Clear(Color.Transparent);
                g.FillEllipse(Brushes.Green, expansionIndicatorImageRect);
            }

            // Draw the collapsed expansion indicator image.
            // A red circle with a black border around it. 
            using (Graphics g = Graphics.FromImage(expansionIndicatorImageCollapsedHotTracked))
            {
                g.Clear(Color.Transparent);
                g.FillEllipse(Brushes.Red, expansionIndicatorImageRect);
                g.DrawEllipse(Pens.Black, expansionIndicatorImageRect);
            }

            // Draw the collapsed expansion indicator image.
            // A green circle with a black border around it. 
            using (Graphics g = Graphics.FromImage(expansionIndicatorImageExpandedHotTracked))
            {
                g.Clear(Color.Transparent);
                g.FillEllipse(Brushes.Green, expansionIndicatorImageRect);
                g.DrawEllipse(Pens.Black, expansionIndicatorImageRect);
            }

            // Assign the images to the tree. 
            this.ultraTree1.ExpansionIndicatorImageCollapsed = expansionIndicatorImageCollapsed;
            this.ultraTree1.ExpansionIndicatorImageExpanded = expansionIndicatorImageExpanded;
            this.ultraTree1.ExpansionIndicatorImageCollapsedHotTracked = expansionIndicatorImageCollapsedHotTracked;
            this.ultraTree1.ExpansionIndicatorImageExpandedHotTracked = expansionIndicatorImageExpandedHotTracked;
参照