public CheckBoxComboBoxListControl(MultiSelectComboBox owner)
: base()
{
DoubleBuffered = true;
_CheckBoxComboBox = owner;
_Items = new CheckBoxComboBoxItemList(_CheckBoxComboBox);
BackColor = SystemColors.Window;
AutoScroll = true;
ResizeRedraw = true;
MinimumSize = new Size(1, 1);
MaximumSize = new Size(500, 500);
}
/// <summary>
/// Initializes a new instance of the <see cref="CheckBoxComboBoxListControl"/> class.
/// </summary>
/// <param name="owner">
/// The owner.
/// </param>
public CheckBoxComboBoxListControl(CheckBoxComboBox owner)
{
this.DoubleBuffered = true;
this._CheckBoxComboBox = owner;
this._Items = new CheckBoxComboBoxItemList(this._CheckBoxComboBox);
this.BackColor = SystemColors.Window;
// AutoScaleMode = AutoScaleMode.Inherit;
this.AutoScroll = true;
this.ResizeRedraw = true;
// if you don't set this, a Resize operation causes an error in the base class.
this.MinimumSize = new Size(1, 1);
this.MaximumSize = new Size(500, 500);
}
/// <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()
{
this.SuspendLayout();
if (this._CheckBoxComboBox._MustAddHiddenItem)
{
this._CheckBoxComboBox.Items.Insert(0, this._CheckBoxComboBox.GetCSVText(false)); // INVISIBLE ITEM
this._CheckBoxComboBox.SelectedIndex = 0;
this._CheckBoxComboBox._MustAddHiddenItem = false;
}
this.Controls.Clear();
for (int Index = this._Items.Count - 1; Index >= 0; Index--)
{
CheckBoxComboBoxItem Item = this._Items[Index];
if (!this._CheckBoxComboBox.Items.Contains(Item.ComboBoxItem))
{
this._Items.Remove(Item);
Item.Dispose();
}
}
#region Recreate the list in the same order of the combo box items
bool HasHiddenItem = this._CheckBoxComboBox.DropDownStyle == ComboBoxStyle.DropDownList && this._CheckBoxComboBox.DataSource == null
&& !this.DesignMode;
var NewList = new CheckBoxComboBoxItemList(this._CheckBoxComboBox);
for (int Index0 = 0; Index0 <= this._CheckBoxComboBox.Items.Count - 1; Index0++)
{
object Object = this._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 && this._Items.Count > 0)
{
Item = this._Items[0];
}
else
{
int StartIndex = HasHiddenItem
? 1 // Skip the hidden item, it could match
: 0;
for (int Index1 = StartIndex; Index1 <= this._Items.Count - 1; Index1++)
{
if (this._Items[Index1].ComboBoxItem == Object)
{
Item = this._Items[Index1];
break;
}
}
}
if (Item == null)
{
Item = new CheckBoxComboBoxItem(this._CheckBoxComboBox, Object);
Item.ApplyProperties(this._CheckBoxComboBox.CheckBoxProperties);
}
NewList.Add(Item);
Item.Dock = DockStyle.Top;
}
this._Items.Clear();
this._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.
this.Controls.AddRange(NewList.ToArray());
}
#endregion
// Keep the first item invisible
if (this._CheckBoxComboBox.DropDownStyle == ComboBoxStyle.DropDownList && this._CheckBoxComboBox.DataSource == null && !this.DesignMode)
{
this._CheckBoxComboBox.CheckBoxItems[0].Visible = false;
}
this.ResumeLayout();
}
public void SynchroniseControlsWithComboBoxItems()
{
SuspendLayout();
if (_CheckBoxComboBox._MustAddHiddenItem)
{
_CheckBoxComboBox.Items.Insert(
0, _CheckBoxComboBox.GetCSVText(false));
_CheckBoxComboBox.SelectedIndex = 0;
_CheckBoxComboBox._MustAddHiddenItem = false;
}
Controls.Clear();
for (int Index = _Items.Count - 1; Index >= 0; Index--)
{
CheckBoxComboBoxItem Item = _Items[Index];
if (!_CheckBoxComboBox.Items.Contains(Item.ComboBoxItem))
{
_Items.Remove(Item);
Item.Dispose();
}
}
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;
if (Index0 == 0 && HasHiddenItem && _Items.Count > 0)
{
Item = _Items[0];
}
else
{
int StartIndex = HasHiddenItem ? 1 : 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);
if (NewList.Count > 0)
{
NewList.Reverse();
Controls.AddRange(NewList.ToArray());
}
if (_CheckBoxComboBox.DropDownStyle == ComboBoxStyle.DropDownList &&
_CheckBoxComboBox.DataSource == null &&
!DesignMode)
{
_CheckBoxComboBox.CheckBoxItems[0].Visible = false;
}
ResumeLayout();
}
