ToolStripItem.Selected Eigenschaft

Definition

Namespace:

System.Windows.Forms

Assembly:

System.Windows.Forms.dll

Ruft einen Wert ab, der angibt, ob das Element ausgewählt ist.

public:
 virtual property bool Selected { bool get(); };

[System.ComponentModel.Browsable(false)]
public virtual bool Selected { get; }

[<System.ComponentModel.Browsable(false)>]
member this.Selected : bool

Public Overridable ReadOnly Property Selected As Boolean

Eigenschaftswert

Boolean

true, wenn das ToolStripItem ausgewählt ist, andernfalls false.

Attribute

BrowsableAttribute

Beispiele

Im folgenden Codebeispiel wird veranschaulicht, wie die Eigenschaft für das Selected benutzerdefinierte Rendering verwendet wird. Dieses Codebeispiel ist Teil eines größeren Beispiels, das für die ToolStripItem Klasse bereitgestellt wird.

// This method defines the behavior for rendering the
// background of a ToolStripItem. If the item is a
// RolloverItem, it paints the item's BackgroundImage 
// centered in the client area. If the mouse is in the 
// item's client area, a border is drawn around it.
// If the item is on a drop-down or if it is on the
// overflow, a gradient is painted in the background.
protected override void OnRenderItemBackground(
    ToolStripItemRenderEventArgs e)
{
    base.OnRenderItemBackground(e);

    RolloverItem item = e.Item as RolloverItem;

    // If the ToolSTripItem is of type RolloverItem, 
    // perform custom rendering for the background.
    if (item != null)
    {
        if (item.Placement == ToolStripItemPlacement.Overflow ||
            item.IsOnDropDown)
        {
            using (LinearGradientBrush b = new LinearGradientBrush(
                item.ContentRectangle,
                Color.Salmon,
                Color.DarkRed,
                0f,
                false))
            {
                e.Graphics.FillRectangle(b, item.ContentRectangle);
            }
        }

        // The RolloverItem control only supports 
        // the ImageLayout.Center setting for the
        // BackgroundImage property.
        if (item.BackgroundImageLayout == ImageLayout.Center)
        {
            // Get references to the item's ContentRectangle
            // and BackgroundImage, for convenience.
            Rectangle cr = item.ContentRectangle;
            Image bgi = item.BackgroundImage;

            // Compute the center of the item's ContentRectangle.
            int centerX = (cr.Width - bgi.Width) / 2;
            int centerY = (cr.Height - bgi.Height) / 2;

            // If the item is selected, draw the background
            // image as usual. Otherwise, draw it as disabled.
            if (item.Selected)
            {
                e.Graphics.DrawImage(bgi, centerX, centerY);
            }
            else
            {
                ControlPaint.DrawImageDisabled(
                        e.Graphics,
                        bgi,
                        centerX,
                        centerY,
                        item.BackColor);
            }
        }

        // If the item is in the rollover state, 
        // draw a border around it.
        if (item.Rollover)
        {
            ControlPaint.DrawFocusRectangle(
                e.Graphics,
                item.ContentRectangle);
        }
    }
}

' This method defines the behavior for rendering the
' background of a ToolStripItem. If the item is a
' RolloverItem, it paints the item's BackgroundImage 
' centered in the client area. If the mouse is in the 
' item's client area, a border is drawn around it.
' If the item is on a drop-down or if it is on the
' overflow, a gradient is painted in the background.
Protected Overrides Sub OnRenderItemBackground(ByVal e As ToolStripItemRenderEventArgs)
    MyBase.OnRenderItemBackground(e)

    Dim item As RolloverItem = CType(e.Item, RolloverItem)

    ' If the ToolSTripItem is of type RolloverItem, 
    ' perform custom rendering for the background.
    If (item IsNot Nothing) Then
        If item.Placement = ToolStripItemPlacement.Overflow OrElse item.IsOnDropDown Then
            Dim b As New LinearGradientBrush(item.ContentRectangle, Color.Salmon, Color.DarkRed, 0.0F, False)
            Try
                e.Graphics.FillRectangle(b, item.ContentRectangle)
            Finally
                b.Dispose()
            End Try
        End If

        ' The RolloverItem control only supports 
        ' the ImageLayout.Center setting for the
        ' BackgroundImage property.
        If item.BackgroundImageLayout = ImageLayout.Center Then
            ' Get references to the item's ContentRectangle
            ' and BackgroundImage, for convenience.
            Dim cr As Rectangle = item.ContentRectangle
            Dim bgi As Image = item.BackgroundImage

            ' Compute the center of the item's ContentRectangle.
            Dim centerX As Integer = CInt((cr.Width - bgi.Width) / 2)
            Dim centerY As Integer = CInt((cr.Height - bgi.Height) / 2)

            ' If the item is selected, draw the background
            ' image as usual. Otherwise, draw it as disabled.
            If item.Selected Then
                e.Graphics.DrawImage(bgi, centerX, centerY)
            Else
                ControlPaint.DrawImageDisabled(e.Graphics, bgi, centerX, centerY, item.BackColor)
            End If
        End If

        ' If the item is in the rollover state, 
        ' draw a border around it.
        If item.Rollover Then
            ControlPaint.DrawFocusRectangle(e.Graphics, item.ContentRectangle)
        End If
    End If
End Sub