protected override void OnPreviewKeyDown(PreviewKeyDownEventArgs e)
{
e.IsInputKey = true;
switch(e.KeyCode)
{
case Keys.Enter:
if(_itemFocus.IsTracked)
{
var item = _itemFocus.Item;
item.Activate();
}
break;
case Keys.Escape:
if(_columnResizeProcess != null)
{
_columnResizeProcess.Cancel();
_columnResizeProcess = null;
}
break;
case Keys.Right:
if(_itemPlainList.Count == 0) return;
if(_itemFocus.Index < 0 || _itemFocus.Index >= _itemPlainList.Count)
{
FocusAndSelectItem(0);
}
else
{
var item = _itemPlainList[_itemFocus.Index];
if(item.Items.Count == 0) return;
if(item.IsExpanded)
{
FocusAndSelectItem(_itemFocus.Index + 1);
}
else
{
item.IsExpanded = true;
}
}
break;
case Keys.Left:
if(_itemPlainList.Count == 0) return;
if(_itemFocus.Index < 0 || _itemFocus.Index >= _itemPlainList.Count)
{
FocusAndSelectItem(_itemPlainList.Count - 1);
}
else
{
var item = _itemPlainList[_itemFocus.Index];
if(item.IsExpanded)
{
if(_showRootTreeLines || item.Level != 0)
{
item.IsExpanded = false;
}
}
else
{
if(item.Parent == null) return;
FocusAndSelectItem(_itemPlainList.IndexOf(item.Parent));
}
}
break;
case Keys.Home:
if(_itemPlainList.Count == 0) return;
if(_itemFocus.Index != 0)
{
FocusAndSelectItem(0);
}
else
{
EnsureVisible(_itemFocus.Index);
}
break;
case Keys.End:
if(_itemPlainList.Count == 0) return;
if(_itemFocus.Index != _itemPlainList.Count - 1)
{
FocusAndSelectItem(_itemPlainList.Count - 1);
}
else
{
EnsureVisible(_itemFocus.Index);
}
break;
case Keys.PageUp:
if(_itemPlainList.Count == 0) return;
{
var index = _itemFocus.Index - GetItemsOnPage();
if(index < 0) index = 0;
if(_itemFocus.Index != index)
{
FocusAndSelectItem(index);
}
else
{
EnsureVisible(_itemFocus.Index);
}
}
break;
case Keys.PageDown:
if(_itemPlainList.Count == 0) return;
{
var index = _itemFocus.Index + GetItemsOnPage();
if(index >= _itemPlainList.Count) index = _itemPlainList.Count - 1;
if(_itemFocus.Index != index)
{
FocusAndSelectItem(index);
}
else
{
EnsureVisible(_itemFocus.Index);
}
}
break;
case Keys.Up:
if(_itemPlainList.Count == 0) return;
if(_itemFocus.Index > 0)
{
int index = _itemFocus.Index - 1;
if(Control.ModifierKeys == Keys.Control)
{
FocusItem(index);
}
else
{
FocusAndSelectItem(index);
}
}
break;
case Keys.Down:
if(_itemPlainList.Count == 0) return;
if(_itemFocus.Index < _itemPlainList.Count - 1)
{
int index = _itemFocus.Index + 1;
if(Control.ModifierKeys == Keys.Control)
{
FocusItem(index);
}
else
{
FocusAndSelectItem(index);
}
}
break;
case Keys.Space:
switch(_selectedItems.Count)
{
case 0:
if(_itemFocus.IsTracked)
{
FocusAndSelectItem(_itemFocus.Index);
}
break;
default:
if(Control.ModifierKeys == Keys.Control)
{
if(_itemFocus.IsTracked)
{
var item = _itemPlainList[_itemFocus.Index];
if(item.IsSelected)
{
_selectedItems.Remove(item);
InvalidateItem(_itemFocus.Index);
}
else if(_multiselect)
{
_selectedItems.Add(item);
InvalidateItem(_itemFocus.Index);
}
}
}
else
{
if(_selectedItems.Count == 1)
{
if(_showCheckBoxes)
{
var item = _selectedItems[0];
switch(item.CheckedState)
{
case CheckedState.Checked:
item.CheckedState = CheckedState.Unchecked;
break;
case CheckedState.Unchecked:
item.CheckedState = CheckedState.Checked;
break;
}
}
else
{
FocusAndSelectItem(_itemFocus.Index);
}
}
}
break;
}
break;
case Keys.A:
if(_multiselect && Control.ModifierKeys == Keys.Control)
{
if(_selectedItems.Count != _itemPlainList.Count)
{
_selectedItems.Clear();
_selectedItems.AddRange(_itemPlainList);
Invalidate(_itemsArea);
}
}
break;
case (Keys)0x5D:
{
ToolStripDropDown menu;
var p = _itemsArea.Location;
p.X += _itemHeight / 2;
int columnIndex = -1;
CustomListBoxColumn column = null;
for(int i = 0; i < _columns.Count; ++i)
{
if(_columns[i].IsVisible)
{
columnIndex = i;
column = _columns[i];
break;
}
}
switch(_selectedItems.Count)
{
case 0:
{
var args = new ContextMenuRequestEventArgs(column, columnIndex, p.X, p.Y);
Events.Raise(ContextMenuRequestedEvent, this, args);
if(args.OverrideDefaultMenu)
{
menu = args.ContextMenu;
}
else
{
menu = GetFreeSpaceContextMenu(args);
}
}
break;
case 1:
{
var index = _itemPlainList.IndexOf(_selectedItems[0]);
EnsureVisible(index);
p.Y = GetItemY1Offset(index) + _itemsArea.Top + _itemHeight / 2;
var args = new ItemContextMenuRequestEventArgs(_selectedItems[0], column, columnIndex, p.X, p.Y);
Events.Raise(ItemContextMenuRequestedEvent, this, args);
if(args.OverrideDefaultMenu)
{
menu = args.ContextMenu;
}
else
{
menu = _selectedItems[0].GetContextMenu(args);
}
}
break;
default:
{
var args = new ItemsContextMenuRequestEventArgs(_selectedItems, column, columnIndex, p.X, p.Y);
Events.Raise(ItemsContextMenuRequestedEvent, this, args);
if(args.OverrideDefaultMenu)
{
menu = args.ContextMenu;
}
else
{
menu = GetMultiselectContextMenu(args);
}
}
break;
}
if(menu != null)
{
menu.Renderer = Style.ToolStripRenderer;
menu.Show(this, p, ToolStripDropDownDirection.Default);
}
}
break;
default:
e.IsInputKey = false;
break;
}
base.OnPreviewKeyDown(e);
}
private void HandleFreeSpaceMouseDown(MouseEventArgs e)
{
if(_selectedItems.Count > 0)
{
int[] indices = new int[_selectedItems.Count];
for(int i = 0; i < indices.Length; ++i)
{
indices[i] = _itemPlainList.IndexOf(_selectedItems[i]);
}
_selectedItems.Clear();
for(int i = 0; i < indices.Length; ++i)
{
Invalidate(GetItemDisplayRect(indices[i]));
}
}
if(e.Button == MouseButtons.Right)
{
if(!_disableContextMenus)
{
var x = e.X;
var y = e.Y;
var cid = GetColumn(ref x, y);
var col = (cid != -1) ? (_columns[cid]) : null;
var args = new ContextMenuRequestEventArgs(col, cid, x, y);
Events.Raise(ContextMenuRequestedEvent, this, args);
ContextMenuStrip menu;
if(args.OverrideDefaultMenu)
{
menu = args.ContextMenu;
}
else
{
menu = GetFreeSpaceContextMenu(args);
}
if(menu != null)
{
menu.Renderer = Style.ToolStripRenderer;
menu.Show(this, e.Location);
}
}
}
}
protected virtual ContextMenuStrip GetFreeSpaceContextMenu(ContextMenuRequestEventArgs requestEventArgs)
{
return null;
}