ObjectListView - TreeListView自動TriStateChecking

Question

有沒有人已經成功地獲得三態複選框在TreeListView中正常工作，而不使用模型對象中的屬性來存儲Checkstate？

因此，例如，一個節點被檢查。所有的孩子（以及兒童孩子等）都應該被檢查，然後所有的父母/祖父母應該根據其兄弟姐妹CheckStates進行檢查。

我嘗試了幾種方法，但每種方法都可以在TreeListView類中獲得ArgumentOutOfRange/ArgumentException。這包括以下內容：

• 在字典中存儲的所有節點CheckStates和使用作爲查找與CheckStateGetter事件
• 遞歸調用函數時的項目CheckState變化（並確保後續ItemCheck事件而編程忽略更改CheckStates）
• 調用一個函數來確定直接的子/父狀態，並讓TreeListView觸發每個受影響節點的ItemChecked事件。

我不斷地從下面的函數錯誤（TreeListView.cs）：

• GetNthItem（）
• 的GetChildren（） - 然後展開/摺疊的shild在GUI
• ProcessLButtonDown（）

如果有任何人在這方面取得了成功，我會全力以赴。

Answer 1

我也有一些TreeListView的問題，並在GetChildren（）函數中發現問題。

GetChildren不必要地試圖擴大相關分支來獲取孩子。這導致內部狀態顯示爲展開，而視圖仍然崩潰並導致內部索引問題。

原始的方法：

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; 
    } 

也許這至少解決了你的一些問題。

Answer 2

「遞歸調用函數時的項目CheckState變化（並確保後續ItemCheck事件，而編程改變CheckStates被忽略）」

如果TreeListView自檢（「從箱」）是對你有好處，你只是想知道當你手動完成一些主要複選框點擊後所有人員完成 （這意味着：你點擊，TreeListView（聯合國）檢查所有兒童和父母）， ，所以你需要在ObjectListView圖書館（粗略）：

\ objectlistviewdemo \ objectlistview \ treelistview。CS

首先添加事件（我的事件是不好的，但你知道要解決什麼）

#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，你需要修復「SetObjectCheckedness」方法

（1種1個簡單+ 1個遞歸遞歸方法）

 /// <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 
    }