public void SelectItems(int startRange, int endRange)
{
_selectedIndices.Clear();
if (startRange == endRange)
{
_selectedIndices.Add(startRange);
}
if (startRange < endRange)
{
for (var i = startRange; i <= endRange; i++)
{
_selectedIndices.Add(i);
}
}
else if (startRange > endRange)
{
for (var i = startRange; i >= endRange; i--)
{
_selectedIndices.Add(i);
}
}
SelectedIndicesChanged?.Invoke(this, null);
Invalidate();
}
public void ClearSelection()
{
_selectedIndices.Clear();
Invalidate();
SelectedIndicesChanged?.Invoke(this, null);
_anchoredItemStart = -1;
_anchoredItemEnd = -1;
}
private void Items_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.NewItems != null)
{
using (var g = CreateGraphics())
{
// Set the area size of all new items
foreach (DarkListItem item in e.NewItems)
{
item.TextChanged += Item_TextChanged;
UpdateItemSize(item, g);
}
}
// Find the starting index of the new item list and update anything past that
if (e.NewStartingIndex < Items.Count - 1)
{
for (var i = e.NewStartingIndex; i <= Items.Count - 1; i++)
{
UpdateItemPosition(Items[i], i);
}
}
}
if (e.OldItems != null)
{
foreach (DarkListItem item in e.OldItems)
{
item.TextChanged -= Item_TextChanged;
}
// Find the starting index of the old item list and update anything past that
if (e.OldStartingIndex < Items.Count - 1)
{
for (var i = e.OldStartingIndex; i <= Items.Count - 1; i++)
{
UpdateItemPosition(Items[i], i);
}
}
}
if (Items.Count == 0)
{
if (_selectedIndices.Count > 0)
{
_selectedIndices.Clear();
SelectedIndicesChanged?.Invoke(this, null);
}
}
UpdateContentSize();
}
public void SelectItem(int index)
{
if (index < 0 || index > Items.Count - 1)
{
throw new IndexOutOfRangeException($"Value '{index}' is outside of valid range.");
}
_selectedIndices.Clear();
_selectedIndices.Add(index);
SelectedIndicesChanged?.Invoke(this, null);
_anchoredItemStart = index;
_anchoredItemEnd = index;
Invalidate();
}
public void SelectItems(IEnumerable <int> indexes)
{
_selectedIndices.Clear();
var list = indexes.ToList();
foreach (var index in list)
{
if (index < 0 || index > Items?.Count - 1)
{
throw new IndexOutOfRangeException($"Value '{index}' is outside of valid range.");
}
_selectedIndices.Add(index);
}
SelectedIndicesChanged?.Invoke(this, EventArgs.Empty);
_anchoredItemStart = list[^ 1];
public void ToggleItem(int index)
{
if (_selectedIndices.Contains(index))
{
_selectedIndices.Remove(index);
// If we just removed both the anchor start AND end then reset them
if (_anchoredItemStart == index && _anchoredItemEnd == index)
{
if (_selectedIndices.Count > 0)
{
_anchoredItemStart = _selectedIndices[0];
_anchoredItemEnd = _selectedIndices[0];
}
else
{
_anchoredItemStart = -1;
_anchoredItemEnd = -1;
}
}
// If we just removed the anchor start then update it accordingly
if (_anchoredItemStart == index)
{
if (_anchoredItemEnd < index)
{
_anchoredItemStart = index - 1;
}
else if (_anchoredItemEnd > index)
{
_anchoredItemStart = index + 1;
}
else
{
_anchoredItemStart = _anchoredItemEnd;
}
}
// If we just removed the anchor end then update it accordingly
if (_anchoredItemEnd == index)
{
if (_anchoredItemStart < index)
{
_anchoredItemEnd = index - 1;
}
else if (_anchoredItemStart > index)
{
_anchoredItemEnd = index + 1;
}
else
{
_anchoredItemEnd = _anchoredItemStart;
}
}
}
else
{
_selectedIndices.Add(index);
_anchoredItemStart = index;
_anchoredItemEnd = index;
}
SelectedIndicesChanged?.Invoke(this, null);
Invalidate();
}
