public FileTreeControlViewModel()
{
LoadedCommand = new DelegateCommand <RoutedEventArgs>(Loaded);
TreeCollection.Add(new TreeViewModel
{
Name = "FolderA",
IsNode = true,
Nodes = new ObservableCollection <TreeViewModel>
{
new TreeViewModel
{
Name = "FileA.xml",
IsNode = false
},
new TreeViewModel
{
Name = "FileB.xml",
IsNode = false
}
}
});
var folderB = new TreeViewModel
{
Name = "FolderB",
IsNode = true
};
TreeCollection.Add(folderB);
folderB.Nodes = new ObservableCollection <TreeViewModel>
{
new TreeViewModel
{
Name = "FolderA",
IsNode = true,
Parent = folderB
},
new TreeViewModel
{
Name = "FolderB",
IsNode = true,
Parent = folderB
},
new TreeViewModel
{
Name = "FileA.xml",
IsNode = false,
Parent = folderB,
},
new TreeViewModel
{
Name = "FileB.xml",
IsNode = false,
Parent = folderB,
}
};
var folderB1 = ((ObservableCollection <TreeViewModel>)folderB.Nodes)[0];
folderB1.Nodes = new ObservableCollection <TreeViewModel>
{
new TreeViewModel
{
Name = "FileA.xml",
IsNode = false,
Parent = folderB1
},
new TreeViewModel
{
Name = "FileB.xml",
IsNode = false,
Parent = folderB1
}
};
var folderB2 = ((ObservableCollection <TreeViewModel>)folderB.Nodes)[1];
folderB2.Nodes = new ObservableCollection <TreeViewModel>
{
new TreeViewModel
{
Name = "FileA.xml",
IsNode = false,
Parent = folderB2
},
new TreeViewModel
{
Name = "FileB.xml",
IsNode = false,
Parent = folderB2
}
};
TreeCollection.AddRange(new List <TreeViewModel>
{
new TreeViewModel
{
Name = "FolderC",
IsNode = true
},
new TreeViewModel
{
Name = "FileA.xml",
IsNode = false
},
new TreeViewModel
{
Name = "FileB.xml",
IsNode = false
}
});
}
/// <summary>
/// 将源移动到目标节点的位置
/// </summary>
/// <param name="sourceModel">源节点</param>
/// <param name="targetModel">目标节点，当移动到根目录时，该项为 null</param>
/// <param name="keepSource">是否保留源节点</param>
/// <param name="isTargetUp">是否添加到目标节点上方</param>
private void Move(TreeViewModel sourceModel, TreeViewModel targetModel, bool keepSource = true, bool isTargetUp = true)
{
if (sourceModel == null || !keepSource && sourceModel == targetModel)
{
return;
}
var targetNodes = (ObservableCollection <TreeViewModel>)((targetModel?.Parent?.Nodes) ?? TreeCollection);
var targetIndex = targetModel == null ? -1 : TreeViewModelBase.IndexOf(targetNodes, m => m == targetModel);
//非根目录，源与目标处于同一父节点
if (targetIndex >= 0 && targetModel.Parent == sourceModel.Parent)
{
var draggingIndex = TreeViewModelBase.IndexOf(targetNodes, m => m == sourceModel);
var diff = targetIndex - draggingIndex;
//源与目标是同一节点
if (diff == 0)
{
var newModel = sourceModel.Clone();
newModel.Parent = targetModel.Parent;
targetNodes.Insert(isTargetUp ? targetIndex : (targetIndex + 1), newModel);
return;
}
//相邻
if (diff < 0)
{
if (!keepSource)
{
targetNodes.Remove(sourceModel);
}
targetNodes.Insert(isTargetUp ? targetIndex : (targetIndex + 1), sourceModel);
}
else
{
if (!keepSource)
{
targetNodes.Remove(sourceModel);
}
targetNodes.Insert(isTargetUp ? (targetIndex - 1) : targetIndex, sourceModel);
}
return;
}
if (!keepSource)
{
var sourceNodes = (ObservableCollection <TreeViewModel>)((sourceModel.Parent?.Nodes) ?? TreeCollection);
sourceNodes.Remove(sourceModel);
//添加到根目录
if (targetIndex < 0)
{
sourceModel.Parent = null;
targetNodes.Add(sourceModel);
}
else
{
sourceModel.Parent = targetModel.Parent;
targetNodes.Insert(isTargetUp ? targetIndex : (targetIndex + 1), sourceModel);
}
}
else
{
var newModel = sourceModel.Clone();
//添加到根目录
if (targetIndex < 0)
{
newModel.Parent = null;
targetNodes.Add(newModel);
}
else
{
newModel.Parent = targetModel.Parent;
targetNodes.Insert(isTargetUp ? targetIndex : (targetIndex + 1), newModel);
}
}
}
