DataGridViewRowPrePaintEventHandler Delegasikan

Definisi

Ruang nama:

System.Windows.Forms

Rakitan:

System.Windows.Forms.dll

Mewakili metode yang akan menangani RowPrePaint peristiwa DataGridView.

public delegate void DataGridViewRowPrePaintEventHandler(System::Object ^ sender, DataGridViewRowPrePaintEventArgs ^ e);

public delegate void DataGridViewRowPrePaintEventHandler(object? sender, DataGridViewRowPrePaintEventArgs e);

type DataGridViewRowPrePaintEventHandler = delegate of obj * DataGridViewRowPrePaintEventArgs -> unit

Public Delegate Sub DataGridViewRowPrePaintEventHandler(sender As Object, e As DataGridViewRowPrePaintEventArgs)

Parameter

sender

Object

Sumber dari peristiwa tersebut.

e

DataGridViewRowPrePaintEventArgs

DataGridViewRowPrePaintEventArgs yang berisi data peristiwa.

Contoh

Contoh kode berikut menyajikan DataGridViewRowPrePaintEventHandler delegasi yang melukis latar belakang baris gradien jika baris dipilih. Contoh kode ini adalah bagian dari contoh yang lebih besar yang disediakan dalam Cara: Menyesuaikan Tampilan Baris di kontrol Formulir Windows DataGridView.

// Paints the custom selection background for selected rows.
void dataGridView1_RowPrePaint(object sender,
        DataGridViewRowPrePaintEventArgs e)
{
    // Do not automatically paint the focus rectangle.
    e.PaintParts &= ~DataGridViewPaintParts.Focus;

    // Determine whether the cell should be painted
    // with the custom selection background.
    if ((e.State & DataGridViewElementStates.Selected) ==
                DataGridViewElementStates.Selected)
    {
        // Calculate the bounds of the row.
        Rectangle rowBounds = new Rectangle(
            this.dataGridView1.RowHeadersWidth, e.RowBounds.Top,
            this.dataGridView1.Columns.GetColumnsWidth(
                DataGridViewElementStates.Visible) -
            this.dataGridView1.HorizontalScrollingOffset + 1,
            e.RowBounds.Height);

        // Paint the custom selection background.
        using (Brush backbrush =
            new System.Drawing.Drawing2D.LinearGradientBrush(rowBounds,
                this.dataGridView1.DefaultCellStyle.SelectionBackColor,
                e.InheritedRowStyle.ForeColor,
                System.Drawing.Drawing2D.LinearGradientMode.Horizontal))
        {
            e.Graphics.FillRectangle(backbrush, rowBounds);
        }
    }
}

' Paints the custom selection background for selected rows.
Sub dataGridView1_RowPrePaint(ByVal sender As Object, _
    ByVal e As DataGridViewRowPrePaintEventArgs) _
    Handles dataGridView1.RowPrePaint

    ' Do not automatically paint the focus rectangle.
    e.PaintParts = e.PaintParts And Not DataGridViewPaintParts.Focus

    ' Determine whether the cell should be painted with the 
    ' custom selection background.
    If (e.State And DataGridViewElementStates.Selected) = _
        DataGridViewElementStates.Selected Then

        ' Calculate the bounds of the row.
        Dim rowBounds As New Rectangle( _
            Me.dataGridView1.RowHeadersWidth, e.RowBounds.Top, _
            Me.dataGridView1.Columns.GetColumnsWidth( _
            DataGridViewElementStates.Visible) - _
            Me.dataGridView1.HorizontalScrollingOffset + 1, _
            e.RowBounds.Height)

        ' Paint the custom selection background.
        Dim backbrush As New _
            System.Drawing.Drawing2D.LinearGradientBrush(rowBounds, _
            Me.dataGridView1.DefaultCellStyle.SelectionBackColor, _
            e.InheritedRowStyle.ForeColor, _
            System.Drawing.Drawing2D.LinearGradientMode.Horizontal)
        Try
            e.Graphics.FillRectangle(backbrush, rowBounds)
        Finally
            backbrush.Dispose()
        End Try
    End If

End Sub

Keterangan

Saat membuat DataGridViewRowPrePaintEventHandler delegasi, Anda mengidentifikasi metode yang akan menangani peristiwa. Untuk mengaitkan peristiwa dengan penanganan aktivitas Anda, tambahkan instans delegasi ke peristiwa. Penanganan aktivitas dipanggil setiap kali peristiwa terjadi, kecuali Anda menghapus delegasi. Untuk informasi selengkapnya tentang delegasi penanganan aktivitas, lihat Menangani dan Menaikkan Peristiwa.

Metode Ekstensi

Lihat juga

• DataGridView
• RowPrePaint
• Cara: Menyesuaikan Tampilan Baris di Formulir Windows Kontrol DataGridView