ObjectListView - TreeListView Auto TriStateChecking

我在TreeListView中也遇到了一些问题，并在GetChildren（）函数中发现了一个问题。

GetChildren不必要地试图扩展相关分支以获取子级。这导致内部状态显示为展开，而视图保持折叠状态，并导致内部索引出现问题。

原始方法：

    public virtual IEnumerable GetChildren(Object model) {
        Branch br = this.TreeModel.GetBranch(model);
        if (br == null || !br.CanExpand)
            return new ArrayList();
        if (!br.IsExpanded)  // THIS IS THE PROBLEM
            br.Expand();
        return br.Children;
    }

固定方法：

    public virtual IEnumerable GetChildren(Object model) {
        Branch br = this.TreeModel.GetBranch(model);
        if (br == null || !br.CanExpand)
            return new ArrayList();
        br.FetchChildren();
        return br.Children;
    }

也许这至少解决了你的一些问题。

如果TreeListView自检（"来自框"）对您有好处，并且您只想知道所有员工在手动完成某些主复选框点击后的时间（这意味着：您单击，TreeListView（取消）检查所有儿童和家长），所以您需要在ObjectListView库中制作额外的事件（粗略地说）：

''objectlistviewdemo''objectlistview''treelistview.cs

首先添加事件（我的事件很糟糕，但你知道该修复什么）

    #region Events
    public delegate void AfterTreeCheckEventHandler(object sender/*, object rowmodel*/);
    /// <summary>
    /// Triggered when clicked main checkbox checked and all related too.
    /// </summary>
    [Category("ObjectListView"),
    Description("This event is triggered when clicked main checkbox checked and all related too.")]
    public event AfterTreeCheckEventHandler AfterTreeCheckAndRecalculate;
    #endregion
    #region OnEvents
    /// <summary>
    /// Tell the world when a cell has finished being edited.
    /// </summary>
    protected virtual void OnAfterTreeCheckAndRecalculate(/*CellEditEventArgs e*/)
    {
        if (this.AfterTreeCheckAndRecalculate != null)
            this.AfterTreeCheckAndRecalculate(this/*, e*/);
    }
    #endregion

其次，您需要修复"SetObjectCheckness"方法（1个递归方法用于1个简单+1个递归）

        /// <summary>
    /// Change the check state of the given object to be the given state.
    /// </summary>
    /// <remarks>
    /// If the given model object isn't in the list, we still try to remember
    /// its state, in case it is referenced in the future.</remarks>
    /// <param name="modelObject"></param>
    /// <param name="state"></param>
    /// <returns>True if the checkedness of the model changed</returns>
    protected override bool SetObjectCheckedness(object modelObject, CheckState state) {
        // If the checkedness of the given model changes AND this tree has 
        // hierarchical checkboxes, then we need to update the checkedness of 
        // its children, and recalculate the checkedness of the parent (recursively)
        bool result = SetObjectCheckednessHelper(modelObject, state, 0);
        if (this.AfterTreeCheckAndRecalculate != null)
            this.AfterTreeCheckAndRecalculate(this); //report that work is done
        return result;
    }
    protected bool SetObjectCheckednessHelper(object modelObject, CheckState state, int i) //recursive
    {
        if (!base.SetObjectCheckedness(modelObject, state))
            return false;
        if (!this.HierarchicalCheckboxes)
            return true;
        // Give each child the same checkedness as the model
        CheckState? checkedness = this.GetCheckState(modelObject);
        if (!checkedness.HasValue || checkedness.Value == CheckState.Indeterminate)
            return true;
        foreach (object child in this.GetChildrenWithoutExpanding(modelObject))
        {
            this.SetObjectCheckednessHelper(child, checkedness.Value, i+1);
        } //(un)check all children checkboxes
        if (i == 0) //recalculate upper levels only in the case of first call
        {
            ArrayList args = new ArrayList();
            args.Add(modelObject);
            this.RecalculateHierarchicalCheckBoxGraph(args); //all upper checkboxes in intermediate state or (un)check 
        }   
        return true;
    }

用法：

    this.olvDataTree.AfterTreeCheckAndRecalculate += new BrightIdeasSoftware.TreeListView.AfterTreeCheckEventHandler(this.olvDataTree_TreeChecked); 
    private void olvDataTree_TreeChecked(object sender)
    {
            //some staff here
    }