/// <summary>
/// Updates the checked items.
/// </summary>
/// <param name="composite">The composite.</param>
/// <param name="cs">The cs.</param>
private void UpdateCheckedItems(ZeroitFlagCheckedListBoxItem composite, CheckState cs)
{
// If the value of the item is 0, call directly.
if (composite.Value == 0)
{
UpdateCheckedItems(0);
}
// Get the total value of all checked items
int sum = 0;
for (int i = 0; i < Items.Count; i++)
{
ZeroitFlagCheckedListBoxItem item = Items[i] as ZeroitFlagCheckedListBoxItem;
// If item is checked, add its value to the sum.
if (GetItemChecked(i))
{
sum |= item.Value;
}
}
// If the item has been unchecked, remove its bits from the sum
if (cs == CheckState.Unchecked)
{
sum = sum & (~composite.Value);
}
else // If the item has been checked, combine its bits with the sum
{
sum |= composite.Value;
}
// Update all items in the checklistbox based on the final bit value
UpdateCheckedItems(sum);
}
/// <summary>
/// Updates the checked items.
/// </summary>
/// <param name="value">The value.</param>
private void UpdateCheckedItems(int value)
{
_isUpdatingCheckStates = true;
// Iterate over all items
for (int i = 0; i < Items.Count; i++)
{
ZeroitFlagCheckedListBoxItem item = Items[i] as ZeroitFlagCheckedListBoxItem;
if (item.Value == 0)
{
SetItemChecked(i, value == 0);
}
else
{
// If the bit for the current item is on in the bitvalue, check it
if ((item.Value & value) == item.Value && item.Value != 0)
{
SetItemChecked(i, true);
}
else // Otherwise uncheck it
{
SetItemChecked(i, false);
}
}
}
_isUpdatingCheckStates = false;
}
/// <summary>
/// Adds a new item to the list.
/// </summary>
/// <param name="value">Value of the new item.</param>
/// <param name="caption">Caption of the new item.</param>
/// <returns>The new item.</returns>
public ZeroitFlagCheckedListBoxItem Add(int value, string caption)
{
ZeroitFlagCheckedListBoxItem item = new ZeroitFlagCheckedListBoxItem(value, caption);
Items.Add(item);
return(item);
}
/// <summary>
/// Handles the <see cref="CheckedListBox.ItemCheck" /> event.
/// </summary>
/// <param name="e">Event arguments</param>
protected override void OnItemCheck(ItemCheckEventArgs e)
{
base.OnItemCheck(e);
if (_isUpdatingCheckStates)
{
return;
}
// Get the checked/unchecked item
ZeroitFlagCheckedListBoxItem item = Items[e.Index] as ZeroitFlagCheckedListBoxItem;
// Update other items
UpdateCheckedItems(item, e.NewValue);
}
/// <summary>
/// Gets the current bit value corresponding to all checked items
/// </summary>
/// <returns>System.Int32.</returns>
public int GetCurrentValue()
{
int sum = 0;
for (int i = 0; i < Items.Count; i++)
{
ZeroitFlagCheckedListBoxItem item = Items[i] as ZeroitFlagCheckedListBoxItem;
if (GetItemChecked(i))
{
sum |= item.Value;
}
}
return(sum);
}
/// <summary>
/// Adds an item to the list.
/// </summary>
/// <param name="item">The item.</param>
/// <returns>The item.</returns>
public ZeroitFlagCheckedListBoxItem Add(ZeroitFlagCheckedListBoxItem item)
{
Items.Add(item);
return(item);
}