This is a concise, user-friendly way to add intuitive functionality to a form that controls one or more lists of entries. It is optimized for 10-Key operators but will also work for QWERTY-mode users.
Drop a Textbox and a Listbox onto the UI; place them close together and name them similarly. For example, txtSerialNumber and lbSerialNumber. Add a ToolTip to the form, toolTip1.
Create event handlers for:
* KeyDown on the Textbox.
* DragDrop, DragOver, KeyDown, and SelectedIndexChanged on the Listbox.
private void txtSerialNumber_KeyDown(object sender, KeyEventArgs e)
{
UnifiedTextboxAndListbox_Keydown(lbSerialNumbers, txtSerialNumber, e);
}
private void lbSerialNumbers_KeyDown(object sender, KeyEventArgs e)
{
UnifiedTextboxAndListbox_Keydown(lbSerialNumbers, txtSerialNumber, e);
}
private void lbSerialNumbers_SelectedIndexChanged(object sender, EventArgs e)
{
if (lbSerialNumbers.SelectedIndex >= 0)
{
txtSerialNumber.Text = lbSerialNumbers.SelectedItem.ToString();
}
}
privatevoid lbSerialNumbers_DragDrop(object sender, DragEventArgs e)
{
HandleDragDrop(e,lbSerialNumbers);
mq.FillGridWithMeoInformation(lbSerialNumbers, lbShopOrders, dgvMesInfo);
}
privatevoid HandleDragDrop(DragEventArgs e, ListBox lb)
{
if (e.Effect == DragDropEffects.Copy)
{
if (e.Data.GetDataPresent(DataFormats.CommaSeparatedValue))
{
char[] sep = {‘\r’};string droppedData = e.Data.GetData(DataFormats.StringFormat, true).ToString();
droppedData = droppedData.Replace(
“\n”,“”);foreach (String s in droppedData.Split(sep))
{
if (s.Length > 0)
{
lb.Items.Add(s);
}
}
}
}
}
private void lbSerialNumbers_DragOver(object sender, DragEventArgs e)
{
HandleDragOver(e);
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private void HandleDragOver(DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.CommaSeparatedValue))
{
e.Effect =
DragDropEffects.Copy;
}
else
{
e.Effect =
DragDropEffects.None;
}
}
private void UnifiedTextboxAndListbox_Keydown(ListBox lb, TextBox txt, KeyEventArgs e)
{
if ((e.KeyCode == Keys.Enter) | (e.KeyCode == Keys.Subtract) | (e.KeyCode == Keys.OemMinus) | (e.KeyCode == Keys.Add) | (e.KeyCode == Keys.Oemplus) | (e.KeyCode == Keys.M))
{
//Process listbox.switch (e.KeyCode)
{
caseKeys.Add:
lb.Items.Add(txt.Text);
break;caseKeys.Oemplus:
lb.Items.Add(txt.Text);
break;caseKeys.Enter:
lb.Items.Add(txt.Text);
break;caseKeys.Subtract:
lb.Items.Remove(txt.Text);
break;caseKeys.OemMinus:
lb.Items.Remove(txt.Text);
break;
}
//Process textbox.
txt.Clear();
//Update UI.
mq.FillGridWithMeoInformation(lbSerialNumbers, lbShopOrders, dgvMesInfo);
//Done.
e.SuppressKeyPress =
true;
e.Handled =
true;
}
}
