所謂Edit樹(shù)節(jié)點(diǎn)的列，有如下兩層含義：（1）根據(jù)某標(biāo)識(shí)決定節(jié)點(diǎn)的某列Cell的形式，例如Cell可選擇為時(shí)間控件，DropDownList控件等等；（2）與第一點(diǎn)類(lèi)似，但是需要在運(yùn)行時(shí)才動(dòng)態(tài)決定Cell的類(lèi)型，例如鼠標(biāo)單擊某Cell的時(shí)候，決定此Cell為哪種控件。因此將這兩種類(lèi)型概括為“靜態(tài)Edit”和“動(dòng)態(tài)Edit”。

一、靜態(tài)Edit

靜態(tài)Edit在DevExpress的官方示例中有一個(gè)很棒的示例。

分析此Demo的源碼，首先看下初始化數(shù)據(jù)部分，函數(shù)為InitData：

//這個(gè)函數(shù)構(gòu)造了一個(gè)包含11元素的Record數(shù)組，并將此數(shù)組作為T(mén)reeList的數(shù)據(jù)源。

private void InitData() {

Record[] records = new Record[11];

records[0] = new Record("Product Name", "Chai", "Teatime Chocolate Biscuits", "Ipoh Coffee", 0);

records[1] = new Record("Category", 1, 2, 1, 1);

records[2] = new Record("Supplier", "Exotic Liquids", "Specialty Biscuits, Ltd.", "Leka Trading", 2);

records[3] = new Record("Quantity Per Unit", "10 boxes x 20 bags", "10 boxes x 12 pieces", "16 - 500 g tins", 3, 0);

records[4] = new Record("Unit Price", 18.00, 9.20, 46.00, 4, 0);

records[5] = new Record("Units in Stock", 39, 25, 17, 5, 0);

records[6] = new Record("Discontinued", true, false, true, 6, 0);

records[7] = new Record("Last Order", new DateTime(2010, 12, 14), new DateTime(2010, 7, 20), new DateTime(2010, 1, 7), 7);

records[8] = new Record("Relevance", 70, 90, 50, 8);

records[9] = new Record("Contact Name", "Shelley Burke", "Robb Merchant", "Sven Petersen", 9, 2);

records[10] = new Record("Phone", "(100)555-4822", "(111)555-1222", "(120)555-1154", 10, 2);

treeList1.DataSource = records;

treeList1.ExpandAll();

}

進(jìn)一步查看Record的源碼，發(fā)現(xiàn)其構(gòu)造函數(shù)為：

public Record(string category, object product1, object product2, object product3, int id) : this(category, product1, product2, product3, id, -1) {}

public Record(string category, object product1, object product2, object product3, int id, int parentID) {

this.fCategory = category;

this.fProduct1 = product1;

this.fProduct2 = product2;

this.fProduct3 = product3;

this.fId = id;

this.fParentID = parentID;

}

在這里需要重視id和parentID的構(gòu)造方法，這兩個(gè)屬性決定的是樹(shù)的層級(jí)關(guān)系。另外，感覺(jué)好像TreeList能夠自動(dòng)綁定名稱(chēng)為ID和ParentID的字段，很神奇。

其次，有了數(shù)據(jù)源就需要設(shè)置其Cell的Edit的形式了，靜態(tài)Edit需要實(shí)現(xiàn)的是GetCustomNodeCellEdit這個(gè)事件響應(yīng)，源碼如下：

private void treeList1_GetCustomNodeCellEdit(object sender, DevExpress.XtraTreeList.GetCustomNodeCellEditEventArgs e) {

if(e.Column.FieldName != "Category") {

object obj = e.Node.GetValue(0);

if(obj != null) {

switch(obj.ToString()) {

case "Category":

e.RepositoryItem = repositoryImageComboBox1;

break;

case "Supplier":

e.RepositoryItem = repositoryItemComboBox1;

break;

case "Unit Price":

e.RepositoryItem = repositoryItemCalcEdit1;

break;

case "Units in Stock":

e.RepositoryItem = repositoryItemSpinEdit1;

break;

case "Discontinued":

e.RepositoryItem = repositoryItemCheckEdit1;

break;

case "Last Order":

e.RepositoryItem = repositoryItemDateEdit1;

break;

case "Relevance":

e.RepositoryItem = repositoryItemProgressBar1;

break;

case "Phone":

e.RepositoryItem = repositoryItemTextEdit1;

break;

}

}

}

}

從源碼中可以看出，根據(jù)數(shù)據(jù)源中的名稱(chēng)屬性決定某一列的Cell采用哪種編輯控件。不過(guò)，這些控件首先都需要在TreeList控件中進(jìn)行聲明的。關(guān)于如何聲明，請(qǐng)看下圖：

二、動(dòng)態(tài)Edit

現(xiàn)在我需要在鼠標(biāo)點(diǎn)擊某個(gè)Cell的時(shí)候確定當(dāng)前的Cell綁定的控件類(lèi)型，這里需要實(shí)現(xiàn)TreeList的CustomNodeCellEditForEditing的響應(yīng)事件。

private void treeList1_CustomNodeCellEditForEditing(object sender, GetCustomNodeCellEditEventArgs e)

{

//確定點(diǎn)擊的是某一個(gè)Cell

if(e.Column.FieldName == "treeListVal")

{

Switch(type)

{

Case type1:

e.RepositoryItem = repositoryItemPopupContainerEditNumber;break;

case type2:

e.RepositoryItem =repositoryItemPopupContainerEditBelong; break;

}

}
}

RepositoryItem所需要控件需要提前在TreeList控件中進(jìn)行聲明的。