DrawListViewSubItemEventArgs.SubItem Properti
Definisi
Penting
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ListViewItem.ListViewSubItem Mendapatkan untuk menggambar.
public:
property System::Windows::Forms::ListViewItem::ListViewSubItem ^ SubItem { System::Windows::Forms::ListViewItem::ListViewSubItem ^ get(); };
public System.Windows.Forms.ListViewItem.ListViewSubItem SubItem { get; }
public System.Windows.Forms.ListViewItem.ListViewSubItem? SubItem { get; }
member this.SubItem : System.Windows.Forms.ListViewItem.ListViewSubItem
Public ReadOnly Property SubItem As ListViewItem.ListViewSubItem
Nilai Properti
Untuk ListViewItem.ListViewSubItem menggambar.
Contoh
Contoh kode berikut menunjukkan cara menggunakan SubItem properti dalam aplikasi yang menyediakan gambar kustom untuk ListView kontrol. Dalam contoh, handler untuk ListView.DrawSubItem peristiwa menggambar nilai teks subitem dan teks dan latar belakang untuk subitem yang memiliki nilai negatif.
Untuk contoh lengkapnya, lihat DrawListViewSubItemEventArgs topik referensi gambaran umum.
// 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
Keterangan
Metode ini berguna ketika properti lain DrawListViewSubItemEventArgs tidak memberikan informasi yang memadai untuk memenuhi kebutuhan Anda. Properti SubItem memungkinkan Anda mengakses semua anggota yang ListViewItem.ListViewSubItem digambar. Anda harus mengakses objek ini secara langsung, misalnya, untuk menggambar ListViewItem.ListViewSubItem.Text nilai sendiri daripada menggunakan DrawText metode .