protected override void OnDrawItem(DrawItemEventArgs e)
{
e.DrawBackground();
e.DrawFocusRectangle();
if (e.Index < 0 || e.Index >= Items.Count)
{
return;
}
object item = Items[e.Index];
GKComboItem ddItem = item as GKComboItem;
if (ddItem != null)
{
int offset = e.Bounds.Left;
if (ddItem.Image != null)
{
e.Graphics.DrawImage(ddItem.Image, e.Bounds.Left, e.Bounds.Top);
offset += ddItem.Image.Width;
}
e.Graphics.DrawString(ddItem.Caption, e.Font, new SolidBrush(e.ForeColor),
offset, e.Bounds.Top + 2);
}
else
{
e.Graphics.DrawString(item.ToString(), e.Font, new SolidBrush(e.ForeColor),
e.Bounds.Left, e.Bounds.Top + 2);
}
base.OnDrawItem(e);
}
public static T GetSelectedTag <T>(ComboBox comboBox)
{
GKComboItem <T> comboItem = (GKComboItem <T>)comboBox.SelectedValue;
T itemTag = (T)comboItem.Tag;
return(itemTag);
}
public T GetSelectedTag <T>()
{
object selectedItem = Control.SelectedValue;
GKComboItem <T> comboItem = selectedItem as GKComboItem <T>;
T itemTag = (comboItem != null) ? comboItem.Tag : default(T);
return(itemTag);
}
public static T GetSelectedTag <T>(ComboBox comboBox)
{
object selectedItem = comboBox.SelectedItem;
GKComboItem comboItem = (GKComboItem)selectedItem;
T itemTag = (T)comboItem.Tag;
return(itemTag);
}
public static void SetSelectedTag <T>(ComboBox comboBox, T tagValue)
{
foreach (object item in comboBox.Items)
{
GKComboItem comboItem = (GKComboItem)item;
T itemTag = (T)comboItem.Tag;
if (tagValue.Equals(itemTag))
{
comboBox.SelectedItem = item;
return;
}
}
comboBox.SelectedIndex = 0;
}
public void SetSelectedTag <T>(T tagValue, bool allowDefault = true)
{
foreach (object item in Control.Items)
{
GKComboItem <T> comboItem = item as GKComboItem <T>;
if (comboItem != null && object.Equals(comboItem.Tag, tagValue))
{
Control.SelectedValue = item;
return;
}
}
if (allowDefault)
{
Control.SelectedIndex = 0;
}
}
public static void SelectComboItem(ListBox listBox, object tag, bool allowDefault)
{
for (int i = 0; i < listBox.Items.Count; i++)
{
GKComboItem item = listBox.Items[i] as GKComboItem;
if (item != null && object.Equals(item.Tag, tag))
{
listBox.SelectedIndex = i;
return;
}
}
if (allowDefault)
{
listBox.SelectedIndex = 0;
}
}
public static void SetSelectedTag <T>(ComboBox comboBox, T tagValue, bool allowDefault = true)
{
foreach (object item in comboBox.Items)
{
GKComboItem <T> comboItem = (GKComboItem <T>)item;
T itemTag = (T)comboItem.Tag;
if (object.Equals(itemTag, tagValue))
{
comboBox.SelectedValue = item;
return;
}
}
if (allowDefault)
{
comboBox.SelectedIndex = 0;
}
}