DrawListViewSubItemEventArgs.Graphics Eigenschaft

Definition

Ruft das Graphics ab, mit dem der ListViewItem.ListViewSubItem gezeichnet wird.Gets the Graphics used to draw the ListViewItem.ListViewSubItem.

public:
 property System::Drawing::Graphics ^ Graphics { System::Drawing::Graphics ^ get(); };
public System.Drawing.Graphics Graphics { get; }
member this.Graphics : System.Drawing.Graphics
Public ReadOnly Property Graphics As Graphics

Eigenschaftswert

Graphics

Ein Graphics, mit dem der ListViewItem.ListViewSubItem gezeichnet wird.A Graphics used to draw the ListViewItem.ListViewSubItem.

Beispiele

Im folgenden Codebeispiel wird veranschaulicht, wie die- Graphics Eigenschaft in einer Anwendung verwendet wird, die benutzerdefinierte Zeichnungen für ein-Steuerelement bereitstellt ListView .The following code example demonstrates how to use the Graphics property in an application that provides custom drawing for a ListView control. Im Beispiel zeichnet ein Handler für das ListView.DrawSubItem -Ereignis die Unterelement-Textwerte und sowohl den Text als auch den Hintergrund für unter Elemente, die negative Werte aufweisen.In the example, a handler for the ListView.DrawSubItem event draws the subitem text values and both the text and background for subitems that have negative values.

Das komplette Beispiel finden Sie im DrawListViewSubItemEventArgs Übersichts Referenz Thema.For the complete example, see the DrawListViewSubItemEventArgs overview reference topic.

// Draws subitem text and applies content-based formatting.
private void listView1_DrawSubItem(object sender,
    DrawListViewSubItemEventArgs e)
{
    TextFormatFlags flags = TextFormatFlags.Left;

    using (StringFormat sf = new StringFormat())
    {
        // Store the column text alignment, letting it default
        // to Left if it has not been set to Center or Right.
        switch (e.Header.TextAlign)
        {
            case HorizontalAlignment.Center:
                sf.Alignment = StringAlignment.Center;
                flags = TextFormatFlags.HorizontalCenter;
                break;
            case HorizontalAlignment.Right:
                sf.Alignment = StringAlignment.Far;
                flags = TextFormatFlags.Right;
                break;
        }

        // Draw the text and background for a subitem with a 
        // negative value. 
        double subItemValue;
        if (e.ColumnIndex > 0 && Double.TryParse(
            e.SubItem.Text, NumberStyles.Currency,
            NumberFormatInfo.CurrentInfo, out subItemValue) &&
            subItemValue < 0)
        {
            // Unless the item is selected, draw the standard 
            // background to make it stand out from the gradient.
            if ((e.ItemState & ListViewItemStates.Selected) == 0)
            {
                e.DrawBackground();
            }

            // Draw the subitem text in red to highlight it. 
            e.Graphics.DrawString(e.SubItem.Text,
                listView1.Font, Brushes.Red, e.Bounds, sf);

            return;
        }

        // Draw normal text for a subitem with a nonnegative 
        // or nonnumerical value.
        e.DrawText(flags);
    }
}
' Draws subitem text and applies content-based formatting.
Private Sub listView1_DrawSubItem(ByVal sender As Object, _
    ByVal e As DrawListViewSubItemEventArgs) _
    Handles listView1.DrawSubItem

    Dim flags As TextFormatFlags = TextFormatFlags.Left

    Dim sf As New StringFormat()
    Try

        ' Store the column text alignment, letting it default
        ' to Left if it has not been set to Center or Right.
        Select Case e.Header.TextAlign
            Case HorizontalAlignment.Center
                sf.Alignment = StringAlignment.Center
                flags = TextFormatFlags.HorizontalCenter
            Case HorizontalAlignment.Right
                sf.Alignment = StringAlignment.Far
                flags = TextFormatFlags.Right
        End Select

        ' Draw the text and background for a subitem with a 
        ' negative value. 
        Dim subItemValue As Double
        If e.ColumnIndex > 0 AndAlso _
            Double.TryParse(e.SubItem.Text, NumberStyles.Currency, _
            NumberFormatInfo.CurrentInfo, subItemValue) AndAlso _
            subItemValue < 0 Then

            ' Unless the item is selected, draw the standard 
            ' background to make it stand out from the gradient.
            If (e.ItemState And ListViewItemStates.Selected) = 0 Then
                e.DrawBackground()
            End If

            ' Draw the subitem text in red to highlight it. 
            e.Graphics.DrawString(e.SubItem.Text, _
                Me.listView1.Font, Brushes.Red, e.Bounds, sf)

            Return

        End If

        ' Draw normal text for a subitem with a nonnegative 
        ' or nonnumerical value.
        e.DrawText(flags)

    Finally
        sf.Dispose()
    End Try

End Sub

Hinweise

Die Graphics -Klasse stellt Eigenschaften und Methoden bereit, die zum Zeichnen auf dem Anzeigegerät nützlich sind.The Graphics class provides properties and methods useful for drawing on the display device.

Gilt für:

Siehe auch