/// <summary>
/// Handles only single selection with keyboard.
/// </summary>
public void HandleKeyUp(int selectedIndex)
{
OnSelectionNotReady?.Invoke(this, EventArgs.Empty);
Listbox.SelectedIndexChanged -= Listbox_SelectedIndexChanged;
Listbox.SelectedIndex = selectedIndex;
if (Listbox.SelectedIndex == -1)
{
OnSelectionReady?.Invoke(this, EventArgs.Empty);
}
else
{
_mouseDownIndex = selectedIndex;
_mouseUpIndex = selectedIndex;
SelectionOld = GetListboxItemsSelection(Listbox.Items.Count, Listbox.SelectedIndices);
SelectedItemsOrdered?.Clear();
SelectedItemsOrdered = new List <string> {
Listbox.SelectedItem.ToString()
};
SelectedIndexesOrdered?.Clear();
SelectedIndexesOrdered = new List <int> {
Listbox.SelectedIndex
};
HandleSelectionChange();
OnSelectionReady?.Invoke(this, EventArgs.Empty);
}
Listbox.SelectedIndexChanged += Listbox_SelectedIndexChanged;
}
public void Cancel(bool unsubscribeToEvents = true)
{
if (unsubscribeToEvents)
{
UnsubscribeToEvents();
Listbox = null;
}
SelectedIndexesOrdered?.Clear();
SelectedItemsOrdered?.Clear();
_mouseDownIndex = -1;
_posY = -1;
_ctrlPressed = false;
_shiftPressed = false;
_mouseUpIndex = -1;
SelectionOld = null;
_shiftSelectionStartIndex = -1;
}
/// <summary>
/// To be used when one selection is removed programmatically and not by mouse.
/// </summary>
private void Listbox_SelectedIndexChanged(object sender, EventArgs e)
{
SetPressedModifierKeys();
if (_ctrlPressed || _shiftPressed)
{
return;
}
var selectionCurrent = GetListboxItemsSelection(Listbox.Items.Count, Listbox.SelectedIndices);
var selectionChangeType = DetermineSelectionChangeType(SelectionOld, selectionCurrent,
ThisIndexHasBeenChangedProgrammatically, ThisIndexHasBeenChangedProgrammatically);
SelectedIndexesOrdered = GetSelectedIndexesInOrder(selectionChangeType, selectionCurrent,
SelectedIndexesOrdered, ThisIndexHasBeenChangedProgrammatically,
ThisIndexHasBeenChangedProgrammatically, Listbox);
if (SelectedItemsOrdered != null)
{
if (SelectedItemsOrdered.Count != 0)
{
SelectedItemsOrdered.RemoveAt(0);
}
}
SelectionOld = GetListboxItemsSelection(Listbox.Items.Count, Listbox.SelectedIndices);
}
