private void OnCompleted(OverlapArea overlapArea, TreeViewItem overlapItem, TreeViewItem draggingItem)
{
TreeBackground = Brushes.Transparent;
TreeViewModelBase.Foreach(TreeCollection, m => m.IsDragOver = false);
if (overlapArea == OverlapArea.Out)
{
return;
}
var draggingModel = draggingItem.DataContext as TreeViewModel;
var overlapModel = overlapItem?.DataContext as TreeViewModel;
/*
* 1. 拖动项是目标目录时，不做移动
* 2. 拖动项是目标目录的直接或间接父节点时，不做移动
*/
if (overlapModel != null && draggingModel.Any <TreeViewModel>(m => m == overlapModel, true))
{
TreeViewModelBase.Foreach(TreeCollection, m => m.IsDragOver = false);
return;
}
Move(draggingModel, overlapModel, false, (overlapArea & OverlapArea.Up) == OverlapArea.Up);
}
private void OnCompleted(OverlapArea overlapArea, TreeViewItem overlapItem, TreeViewItem draggingItem)
{
TreeBackground = Brushes.Transparent;
TreeViewModelBase.Foreach(TreeCollection, m => m.IsDragOver = false);
if (overlapArea == OverlapArea.Out)
{
return;
}
var draggingModel = draggingItem.DataContext as TreeViewModel;
var overlapFolderModel = overlapItem?.DataContext as TreeViewModel;
/*
* 1. 拖动项是目标目录的直接子节点时，包括目标目录是根目录的情况，不做移动
* 注：目标目录是根目录时，overlapItem 是 null
* 2. 拖动项是目标目录时，不做移动
* 3. 拖动项是目标目录的直接或间接父节点时，不做移动
*/
if (draggingModel.Parent == overlapFolderModel ||
draggingModel == overlapFolderModel ||
overlapFolderModel != null && draggingModel.Any <TreeViewModel>(m => m == overlapFolderModel))
{
return;
}
//TODO Move
}
/// <summary>
/// 若当前节点可见：
/// 1.该节点以上的父节点均得可见
/// 2.若该节点所有子节点均不可见，则该节点以下的子节点均得可见
/// </summary>
public void TryFilter(Predicate <T> filter)
{
if (filter == null)
{
TreeViewModelBase.Foreach(_source, n => n.Visibility = Visibility.Visible);
return;
}
foreach (var nodeList in _childToParentNodeStack)
{
nodeList.ForEach(node =>
{
node.Visibility = filter(node) ? Visibility.Visible : Visibility.Collapsed;
//父节点满足条件，则所有子节点都显示
//父节点不满足条件，则根据是否存在显示的子节点来决定
if (node.Nodes != null && node.Nodes.Any())
{
if (node.Visibility == Visibility.Visible)
{
TreeViewModelBase.Foreach((IEnumerable <T>)node.Nodes, n => n.Visibility = Visibility.Visible);
}
else
{
node.Visibility = node.Nodes.Any(n => n.Visibility == Visibility.Visible) ? Visibility.Visible : Visibility.Collapsed;
}
}
});
}
}
private void OnOverlapItem(OverlapArea overlapArea, ListBoxItem overlapItem, ListBoxItem draggingItem)
{
var draggingModel = draggingItem.DataContext as TreeViewModel;
draggingModel.IsDragSource = true;
if (overlapArea == OverlapArea.Out)
{
TreeBackground = Brushes.Transparent;
TreeViewModelBase.Foreach(TreeCollection, m => m.IsDragOver = false);
return;
}
var overlapModel = overlapItem?.DataContext as TreeViewModel;
/*
* 1. 拖动项是目标目录时，不做移动
*/
if (overlapModel != null && overlapModel == draggingModel)
{
TreeBackground = Brushes.Transparent;
TreeViewModelBase.Foreach(TreeCollection, m => m.IsDragOver = false);
return;
}
//根目录
if (overlapModel == null)
{
TreeBackground = ColorUtil.GetBrushFromString("#d6ebff");
TreeViewModelBase.Foreach(TreeCollection, m => m.IsDragOver = false);
}
else
{
TreeBackground = Brushes.Transparent;
TreeViewModelBase.Foreach(TreeCollection, m =>
{
m.IsDragOverUp = (overlapArea & OverlapArea.Up) == OverlapArea.Up;
m.IsDragOverDown = (overlapArea & OverlapArea.Down) == OverlapArea.Down;
m.IsDragOverLeft = (overlapArea & OverlapArea.Left) == OverlapArea.Left;
m.IsDragOverRight = (overlapArea & OverlapArea.Right) == OverlapArea.Right;
m.IsDragOver = m == overlapModel;
});
}
}
private void OnOverlapFolder(OverlapArea overlapArea, TreeViewItem overlapItem, TreeViewItem draggingItem)
{
if (overlapArea == OverlapArea.Out)
{
TreeBackground = Brushes.Transparent;
TreeViewModelBase.Foreach(TreeCollection, m => m.IsDragOver = false);
return;
}
var overlapModel = overlapItem?.DataContext as TreeViewModel;
var draggingModel = draggingItem.DataContext as TreeViewModel;
/*
* 1. 拖动项是目标目录时，不做移动
* 2. 拖动项是目标目录的直接或间接父节点时，不做移动
*/
if (overlapModel != null && draggingModel.Any <TreeViewModel>(m => m == overlapModel, true))
{
TreeBackground = Brushes.Transparent;
TreeViewModelBase.Foreach(TreeCollection, m => m.IsDragOver = false);
return;
}
//根目录
if (overlapModel == null)
{
TreeBackground = ColorUtil.GetBrushFromString("#d6ebff");
TreeViewModelBase.Foreach(TreeCollection, m => m.IsDragOver = false);
}
else
{
TreeBackground = Brushes.Transparent;
overlapModel.IsExpanded = true;
TreeViewModelBase.Foreach(TreeCollection, m =>
{
m.IsDragOverUp = (overlapArea & OverlapArea.Up) == OverlapArea.Up;
m.IsDragOverDown = (overlapArea & OverlapArea.Down) == OverlapArea.Down;
m.IsDragOver = m == overlapModel;
});
}
}
private void OnOverlapItem(OverlapArea overlapArea, TreeViewItem overlapItem, TreeViewItem draggingItem)
{
if (overlapArea == OverlapArea.Out)
{
TreeBackground = Brushes.Transparent;
TreeViewModelBase.Foreach(TreeCollection, m => m.IsDragOver = false);
return;
}
var overlapFolderModel = overlapItem?.DataContext as TreeViewModel;
var draggingModel = draggingItem.DataContext as TreeViewModel;
/*
* 1. 拖动项是目标目录的直接子节点时，包括目标目录是根目录的情况，不做移动
* 注：目标目录是根目录时，overlapItem 是 null
* 2. 拖动项是目标目录时，不做移动
* 3. 拖动项是目标目录的直接或间接父节点时，不做移动
*/
if (draggingModel.Parent == overlapFolderModel ||
draggingModel == overlapFolderModel ||
overlapFolderModel != null && draggingModel.Any <TreeViewModel>(m => m == overlapFolderModel))
{
TreeBackground = Brushes.Transparent;
TreeViewModelBase.Foreach(TreeCollection, m => m.IsDragOver = false);
return;
}
if (overlapFolderModel == null)
{
TreeBackground = ColorUtil.GetBrushFromString("#d6ebff");
TreeViewModelBase.Foreach(TreeCollection, m => m.IsDragOver = false);
return;
}
else
{
overlapFolderModel.IsExpanded = true;
TreeBackground = Brushes.Transparent;
TreeViewModelBase.Foreach(TreeCollection, m => m.IsDragOver = m == overlapFolderModel);
}
}
private void OnCompleted(OverlapArea overlapArea, ListBoxItem overlapItem, ListBoxItem draggingItem)
{
TreeBackground = Brushes.Transparent;
TreeViewModelBase.Foreach(TreeCollection, m => m.IsDragOver = m.IsDragSource = false);
if (overlapArea == OverlapArea.Out)
{
return;
}
var draggingModel = draggingItem.DataContext as TreeViewModel;
var overlapModel = overlapItem?.DataContext as TreeViewModel;
/*
* 1. 拖动项是目标目录时，不做移动
*/
if (overlapModel != null && overlapModel == draggingModel)
{
TreeViewModelBase.Foreach(TreeCollection, m => m.IsDragOver = false);
return;
}
//Move(draggingModel, overlapModel, false, (overlapArea & OverlapArea.Up) == OverlapArea.Up);
}