public CheckBoxComboBoxListControl(CheckBoxComboBox owner)
{
DoubleBuffered = true;
_checkBoxComboBox = owner;
_items = new CheckBoxComboBoxItemList(_checkBoxComboBox);
BackColor = SystemColors.Window;
// AutoScaleMode = AutoScaleMode.Inherit;
AutoScroll = true;
ResizeRedraw = true;
// if you don't set this, a Resize operation causes an error in the base class.
MinimumSize = new Size(1, 1);
MaximumSize = new Size(800, 640);
}
public void SynchroniseControlsWithComboBoxItems()
{
SuspendLayout();
if (_checkBoxComboBox.MustAddHiddenItem)
{
_checkBoxComboBox.Items.Insert(
0, _checkBoxComboBox.GetCSVText(false)); // INVISIBLE ITEM
_checkBoxComboBox.SelectedIndex = 0;
_checkBoxComboBox.MustAddHiddenItem = false;
}
Controls.Clear();
for (var index = _items.Count - 1; index >= 0; index--)
{
var item = _items[index];
if (!_checkBoxComboBox.Items.Contains(item.ComboBoxItem))
{
_items.Remove(item);
item.Dispose();
}
}
var hasHiddenItem =
_checkBoxComboBox.DropDownStyle == ComboBoxStyle.DropDownList &&
_checkBoxComboBox.DataSource == null &&
!DesignMode;
var newList = new CheckBoxComboBoxItemList(_checkBoxComboBox);
for (var index0 = 0; index0 <= _checkBoxComboBox.Items.Count - 1; index0++)
{
var Object = _checkBoxComboBox.Items[index0];
CheckBoxComboBoxItem item = null;
// The hidden item could match any other item when only
// one other item was selected.
if (index0 == 0 && hasHiddenItem && _items.Count > 0)
{
item = _items[0];
}
else
{
var startIndex = hasHiddenItem
? 1 // Skip the hidden item, it could match
: 0;
for (var index1 = startIndex; index1 <= _items.Count - 1; index1++)
{
if (_items[index1].ComboBoxItem != Object)
{
continue;
}
item = _items[index1];
break;
}
}
if (item == null)
{
item = new CheckBoxComboBoxItem(_checkBoxComboBox, Object);
item.ApplyProperties(_checkBoxComboBox.CheckBoxProperties);
}
newList.Add(item);
item.Dock = DockStyle.Top;
}
_items.Clear();
_items.AddRange(newList);
if (newList.Count > 0)
{
// This reverse helps to maintain correct docking order.
newList.Reverse();
// If you get an error here that "Cannot convert to the desired
// type, it probably means the controls are not binding correctly.
// The Checked property is binded to the ValueMember property.
// It must be a bool for example.
// ReSharper disable once CoVariantArrayConversion
Controls.AddRange(newList.ToArray());
}
// Keep the first item invisible
if (_checkBoxComboBox.DropDownStyle == ComboBoxStyle.DropDownList &&
_checkBoxComboBox.DataSource == null &&
!DesignMode)
{
_checkBoxComboBox.CheckBoxItems[0].Visible = false;
}
ResumeLayout();
}
/// <summary>
/// Maintains the controls displayed in the list by keeping them in sync with the actual
/// items in the combobox. (e.g. removing and adding as well as ordering)
/// </summary>
public void SynchroniseControlsWithComboBoxItems()
{
SuspendLayout();
if (_CheckBoxComboBox._MustAddHiddenItem)
{
_CheckBoxComboBox.Items.Insert(
0, _CheckBoxComboBox.GetCSVText(false)); // INVISIBLE ITEM
_CheckBoxComboBox.SelectedIndex = 0;
_CheckBoxComboBox._MustAddHiddenItem = false;
}
Controls.Clear();
#region Disposes all items that are no longer in the combo box list
for (int Index = _Items.Count - 1; Index >= 0; Index--)
{
CheckBoxComboBoxItem Item = _Items[Index];
if (!_CheckBoxComboBox.Items.Contains(Item.ComboBoxItem))
{
_Items.Remove(Item);
Item.Dispose();
}
}
#endregion
#region Recreate the list in the same order of the combo box items
bool HasHiddenItem =
_CheckBoxComboBox.DropDownStyle == ComboBoxStyle.DropDownList &&
_CheckBoxComboBox.DataSource == null &&
!DesignMode;
CheckBoxComboBoxItemList NewList = new CheckBoxComboBoxItemList(_CheckBoxComboBox);
for (int Index0 = 0; Index0 <= _CheckBoxComboBox.Items.Count - 1; Index0++)
{
object Object = _CheckBoxComboBox.Items[Index0];
CheckBoxComboBoxItem Item = null;
// The hidden item could match any other item when only
// one other item was selected.
if (Index0 == 0 && HasHiddenItem && _Items.Count > 0)
{
Item = _Items[0];
}
else
{
int StartIndex = HasHiddenItem
? 1 // Skip the hidden item, it could match
: 0;
for (int Index1 = StartIndex; Index1 <= _Items.Count - 1; Index1++)
{
if (_Items[Index1].ComboBoxItem == Object)
{
Item = _Items[Index1];
break;
}
}
}
if (Item == null)
{
Item = new CheckBoxComboBoxItem(_CheckBoxComboBox, Object);
Item.ApplyProperties(_CheckBoxComboBox.CheckBoxProperties);
}
NewList.Add(Item);
Item.Dock = DockStyle.Top;
}
_Items.Clear();
_Items.AddRange(NewList);
#endregion
#region Add the items to the controls in reversed order to maintain correct docking order
if (NewList.Count > 0)
{
// This reverse helps to maintain correct docking order.
NewList.Reverse();
// If you get an error here that "Cannot convert to the desired
// type, it probably means the controls are not binding correctly.
// The Checked property is binded to the ValueMember property.
// It must be a bool for example.
Controls.AddRange(NewList.ToArray());
}
#endregion
// Keep the first item invisible
if (_CheckBoxComboBox.DropDownStyle == ComboBoxStyle.DropDownList &&
_CheckBoxComboBox.DataSource == null &&
!DesignMode)
{
_CheckBoxComboBox.CheckBoxItems[0].Visible = false;
}
ResumeLayout();
}