WinForms Data Grid - Show editor button when hovering over a data cell

In this example:

The GridView.OptionsView.ShowButtonMode property speifies when the View displays editor buttons. Available modes include:

• Display editor buttons for all data cells.
• Display editor buttons for the focused cell.
• Display editor buttons for data cells within the focused row.
• Display editor buttons for the active cell editor.

This example handles the CustomDrawCell event to display editor buttons when hovering over a grid cell:

int rowHandle = -1;
private void gridView1_MouseMove(object sender, MouseEventArgs e) {
    GridView view = sender as GridView;
    GridHitInfo hi = view.CalcHitInfo(e.Location);

    if(hi.InRowCell && hi.Column.FieldName == "Text") 
        rowHandle = hi.RowHandle;
    else
        rowHandle = -1;
   view.Invalidate(); 
}
private void gridView1_CustomDrawCell(object sender, DevExpress.XtraGrid.Views.Base.RowCellCustomDrawEventArgs e) {
    if(e.Column.FieldName == "Text" && e.RowHandle == rowHandle) {
        GridCellInfo cellInfo = e.Cell as GridCellInfo;
        ButtonEditViewInfo info = cellInfo.ViewInfo as ButtonEditViewInfo;
        Rectangle textRect = info.MaskBoxRect;
        textRect.Offset(e.Bounds.X, e.Bounds.Y);
        EditorButtonObjectInfoArgs args = new EditorButtonObjectInfoArgs(e.Cache, info.Item.Buttons[0], e.Appearance);
        Rectangle minBounds = info.EditorButtonPainter.CalcObjectMinBounds(args);
        args.Bounds = new Rectangle(e.Bounds.Right - minBounds.Width, e.Bounds.Y + (e.Bounds.Height - minBounds.Height) / 2, minBounds.Width, minBounds.Height);
        info.EditorButtonPainter.DrawObject(args);
        e.Cache.DrawString(e.DisplayText, e.Appearance.Font, e.Appearance.GetForeBrush(e.Cache), textRect, e.Appearance.GetStringFormat());
        e.Handled = true;
    }
}

Files to Review

• Form1.cs (VB: Form1.vb)

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