// Checks/Unchecks items depending on the give bitvalue
protected void UpdateCheckedItems(int value)
{
isUpdatingCheckStates = true;
// Iterate over all items
for (int i = 0; i < Items.Count; i++)
{
FlagCheckedListBoxItem item = Items[i] as FlagCheckedListBoxItem;
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);
}
// Otherwise uncheck it
else
{
SetItemChecked(i, false);
}
}
}
isUpdatingCheckStates = false;
}
// Adds an integer value and its associated description
public FlagCheckedListBoxItem Add(int v, string c)
{
FlagCheckedListBoxItem item = new FlagCheckedListBoxItem(v, c);
Items.Add(item);
return(item);
}
protected override void OnItemCheck(ItemCheckEventArgs e)
{
base.OnItemCheck(e);
if (isUpdatingCheckStates)
{
return;
}
// Get the checked/unchecked item
FlagCheckedListBoxItem item = Items[e.Index] as FlagCheckedListBoxItem;
// Update other items
UpdateCheckedItems(item, e.NewValue);
}
// Gets the current bit value corresponding to all checked items
public int GetCurrentValue()
{
int sum = 0;
for (int i = 0; i < Items.Count; i++)
{
FlagCheckedListBoxItem item = Items[i] as FlagCheckedListBoxItem;
if (GetItemChecked(i))
{
sum |= item.value;
}
}
return(sum);
}
// Updates items in the checklistbox
// composite = The item that was checked/unchecked
// cs = The check state of that item
protected void UpdateCheckedItems(FlagCheckedListBoxItem 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++)
{
FlagCheckedListBoxItem item = Items[i] as FlagCheckedListBoxItem;
// 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);
}
// If the item has been checked, combine its bits with the sum
else
{
sum |= composite.value;
}
// Update all items in the checklistbox based on the final bit value
UpdateCheckedItems(sum);
}
public FlagCheckedListBoxItem Add(FlagCheckedListBoxItem item)
{
Items.Add(item);
return(item);
}
// Returns true if this value is a member of the composite bit value
public bool IsMemberFlag(FlagCheckedListBoxItem composite)
{
return(IsFlag && ((value & composite.value) == value));
}