GARbro-mirror/ListViewEx.cs
2015-12-30 14:24:52 +04:00

183 lines
5.8 KiB
C#

//! \file ListViewEx.cs
//! \date Thu Jul 24 02:19:38 2014
//! \brief Extended ListView with explorer-like multiple items selection.
//
// Copyright (C) 2014 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Collections;
using System.Diagnostics;
using System.Linq;
namespace GARbro.GUI
{
/// <summary>
/// This Extended ListView allows selecting multiple items by dragging mouse over them.
/// </summary>
public class ListViewEx : ListView
{
public bool SelectionActive { get; set; }
public ListViewItem LastSelectedItem { get; set; }
public ListViewEx ()
{
}
protected override DependencyObject GetContainerForItemOverride()
{
return new ListViewItemEx();
}
protected override void OnMouseLeftButtonDown (MouseButtonEventArgs e)
{
if (0 == (Keyboard.Modifiers & (ModifierKeys.Control | ModifierKeys.Shift)))
{
StartDragSelect();
}
base.OnMouseLeftButtonDown (e);
}
protected override void OnMouseLeftButtonUp (MouseButtonEventArgs e)
{
if (SelectionActive)
{
EndDragSelect();
}
base.OnMouseLeftButtonUp (e);
}
protected override void OnMouseLeave (MouseEventArgs e)
{
if (SelectionActive)
{
EndDragSelect();
}
base.OnMouseLeave (e);
}
protected override void OnItemsSourceChanged (IEnumerable oldValue, IEnumerable newValue)
{
if (SelectionActive)
{
EndDragSelect();
}
base.OnItemsSourceChanged (oldValue, newValue);
}
internal void StartDragSelect ()
{
SelectionActive = true;
SelectedItems.Clear();
}
internal void EndDragSelect ()
{
SelectionActive = false;
LastSelectedItem = null;
}
internal void ContinueDragSelect (ListViewItem addition)
{
if (null != LastSelectedItem)
{
int start = ItemContainerGenerator.IndexFromContainer (LastSelectedItem);
int end = ItemContainerGenerator.IndexFromContainer (addition);
if (start != -1 && end != -1)
{
if (start > end)
{
int index = start;
start = end;
end = index;
}
// for each item in the range [start, end]
foreach (var item in Items.Cast<object>().Skip (start).Take (end-start+1))
{
var lvi = ItemContainerGenerator.ContainerFromItem (item) as ListViewItem;
if (null != lvi && !lvi.IsSelected)
lvi.IsSelected = true;
}
}
}
if (!addition.IsSelected)
addition.IsSelected = true;
LastSelectedItem = addition;
}
}
class ListViewItemEx : ListViewItem
{
private ListViewEx ParentListView
{
get { return ItemsControl.ItemsControlFromItemContainer (this) as ListViewEx; }
}
protected override void OnPreviewMouseLeftButtonDown (MouseButtonEventArgs e)
{
var lv = ParentListView;
if (null != lv)
{
if (0 == (Keyboard.Modifiers & (ModifierKeys.Control | ModifierKeys.Shift)))
{
lv.StartDragSelect();
lv.ContinueDragSelect (this);
return;
}
}
base.OnPreviewMouseLeftButtonDown(e);
}
protected override void OnPreviewMouseLeftButtonUp (MouseButtonEventArgs e)
{
var lv = ParentListView;
if (null != lv && lv.SelectionActive)
{
lv.EndDragSelect();
}
base.OnPreviewMouseLeftButtonUp(e);
}
protected override void OnMouseDoubleClick (MouseButtonEventArgs e)
{
var lv = ParentListView;
if (null != lv && lv.SelectionActive)
{
lv.EndDragSelect();
}
base.OnMouseDoubleClick (e);
}
protected override void OnMouseEnter (MouseEventArgs e)
{
var lv = ParentListView;
if (null != lv && lv.SelectionActive)
{
lv.ContinueDragSelect (this);
return;
}
base.OnMouseEnter (e);
}
}
}