/// <summary>
/// Adds the task to the selected list. This method is invoked by the AddCommand.
/// </summary>
public void AddTask()
{
// add the selected task to the collection of selected tasks
TaskTreeNodeViewModel taskNodeVM = SelectedNode as TaskTreeNodeViewModel;
TaskViewModel taskVM = new TaskViewModel(_taskData.GetTaskByTaskId(taskNodeVM.NodeId), _taskData);
SelectedTasks.Add(taskVM);
RemoveTaskFromTree(taskNodeVM, taskVM);
// clear the selected node
SelectedNode = null;
}
void GongSolutions.Wpf.DragDrop.IDropTarget.Drop(DropInfo dropInfo)
{
if (dropInfo.Data is TaskViewModel)
{
// drop a task from the list view to the tree view
TaskViewModel sourceTask = (TaskViewModel)dropInfo.Data;
((ListCollectionView)dropInfo.DragInfo.SourceCollection).Remove(sourceTask);
AddTaskToTree(sourceTask);
}
else
{
// drop a task from the tree view to the list view
TaskTreeNodeViewModel sourceTask = (TaskTreeNodeViewModel)dropInfo.Data;
TaskViewModel taskVM = new TaskViewModel(_taskData.GetTaskByTaskId(sourceTask.NodeId), _taskData);
RemoveTaskFromTree(sourceTask, taskVM);
((ListCollectionView)dropInfo.TargetCollection).AddNewItem(taskVM);
((ListCollectionView)dropInfo.TargetCollection).CommitNew();
}
}
/// <summary>
/// Remove the node and any empty ancestors from the tree
/// </summary>
void RemoveTaskFromTree(TaskTreeNodeViewModel taskNodeVM, TaskViewModel taskVM)
{
ITreeNodeContainerViewModel parent = taskNodeVM.Parent;
if (parent != null)
{
_removedNodes.Add(taskVM, taskNodeVM);
parent.ChildNodes.Remove(taskNodeVM);
while (parent != null && parent.ChildNodes.Count == 0)
{
ITreeNodeContainerViewModel child = parent;
parent = child.Parent;
if (parent != null)
{
parent.ChildNodes.Remove(child);
}
}
}
}