XAF-如何改變列表點擊時的默認行為 - foreachlife－IT工程師數位筆記本

文章出處

在 Windows 窗體應用程序中，按下回車或雙擊列表會打開默認的詳細視圖。

在 ASP.NET Web 應用程序中，單擊對象時執行此操作。

這一行為是由 ListViewProcessCurrentObjectController 的 ListViewProcessCurrentObjectController.ProcessCurrentObjectAction 按鈕所定義的。

可以將此操作替換為自定義的簡單操作。下面演示如何執行此操作。

示例代碼在這里。

有下面的BO定義，地址記錄。

[DefaultClassOptions, ImageName("BO_Contact")]
public class AddressBookRecord : BaseObject {
    public AddressBookRecord(Session session) : base(session) { }
    private string name;
    public string Name {
        get { return name; }
        set { SetPropertyValue("Name", ref name, value); }
    }
    private string email;
    public string Email {
        get { return email; }
        set { SetPropertyValue("Email", ref email, value); }
    }
    private string phoneNumber;
    public string PhoneNumber {
        get { return phoneNumber; }
        set { SetPropertyValue("PhoneNumber", ref phoneNumber, value); }
    }
}

現在并為AddressBookRecord 對象操作加一個WriteMailController，并填加 WriteMail Action。這個操作將調用與最終用戶的計算機上的 MailTo 協議相關聯的程序。說白了就是發個郵件，調用郵件客戶端。

using System.Diagnostics;
// ... 
public class WriteMailController : ViewController {
    private SimpleAction writeMailAction;
    public WriteMailController() {
        TargetObjectType = typeof(AddressBookRecord);
        writeMailAction = new SimpleAction(this, "WriteMail", PredefinedCategory.Edit);
        writeMailAction.ToolTip = "Write e-mail to the selected address book record";
        writeMailAction.SelectionDependencyType = SelectionDependencyType.RequireSingleObject;
        writeMailAction.ImageName = "BO_Contact";
        writeMailAction.Execute += writeMailAction_Execute;
    }
    void writeMailAction_Execute(object sender, SimpleActionExecuteEventArgs e) {
        AddressBookRecord record = (AddressBookRecord)e.CurrentObject;
        string startInfo = String.Format(
            "mailto:{0}?body=Hello, {1}!%0A%0A", record.Email, record.Name);
        Process.Start(startInfo);
    }
}

默認情況下，只有選中了列表中的一條記錄后，再點擊上面我們填加的按鈕，才會執行調用郵件客戶端的動作。

下面，我們演示，在win中雙擊列表，即執行上面的動作。

using DevExpress.ExpressApp.SystemModule;
// ... 
public class WriteMailController : ViewController {
    // ... 
    private ListViewProcessCurrentObjectController processCurrentObjectController;
    protected override void OnActivated() {
        base.OnActivated();
        processCurrentObjectController =
            Frame.GetController<ListViewProcessCurrentObjectController>();
        if (processCurrentObjectController != null) {
            processCurrentObjectController.CustomProcessSelectedItem +=
                processCurrentObjectController_CustomProcessSelectedItem;
        }
    }
    private void processCurrentObjectController_CustomProcessSelectedItem(object sender, CustomProcessListViewSelectedItemEventArgs e) {
        e.Handled = true;
        writeMailAction.DoExecute();
    }
    protected override void OnDeactivated() {
        if (processCurrentObjectController != null) {
            processCurrentObjectController.CustomProcessSelectedItem -= 
                processCurrentObjectController_CustomProcessSelectedItem;
        }
        base.OnDeactivated();
    }
}

下面是效果：

這時你會發現，你沒辦法修改記錄了，即詳細視圖沒辦法顯示出來了。下面代碼來解決這樣的問題，即，加個控制器，實現這些功能。

using DevExpress.ExpressApp.SystemModule;
// ... 
public class EditAddressBookRecordController : ViewController<ListView> {
    public EditAddressBookRecordController() {
        TargetObjectType = typeof(AddressBookRecord);
        SimpleAction editAddressBookRecordAction = 
            new SimpleAction(this, "EditAddressBookRecord", PredefinedCategory.Edit);
        editAddressBookRecordAction.ImageName = "Action_Edit";
        editAddressBookRecordAction.SelectionDependencyType = 
            SelectionDependencyType.RequireSingleObject;
        editAddressBookRecordAction.Execute += editAddressBookRecordAction_Execute;
    }
    void editAddressBookRecordAction_Execute(object sender, SimpleActionExecuteEventArgs e) {
        ListViewProcessCurrentObjectController.ShowObject(
            e.CurrentObject, e.ShowViewParameters, Application, Frame, View);
    }
}