XAF-如何改变列表点击时的默认行为

在 Windows 窗体应用程序中，按下回车或双击列表会打开默认的详细视图。

在 ASP.NET Web 应用程序中，单击对象时执行此操作。

这一行为是由 ListViewProcessCurrentObjectController 的 ListViewProcessCurrentObjectController.ProcessCurrentObjectAction 按钮所定义的。

可以将此操作替换为自定义的简单操作。下面演示如何执行此操作。

示例代码在这里。

有下面的BO定义，地址记录。

[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); }

    }

}

现在并为AddressBookRecord 对象操作加一个WriteMailController，并填加 WriteMail Action。这个操作将调用与最终用户的计算机上的 MailTo 协议相关联的程序。说白了就是发个邮件，调用邮件客户端。

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);

    }

}

默认情况下，只有选中了列表中的一条记录后，再点击上面我们填加的按钮，才会执行调用邮件客户端的动作。

下面，我们演示，在win中双击列表，即执行上面的动作。

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：

这时你会发现，你没办法修改记录了，即详细视图没办法显示出来了。下面代码来解决这样的问题，即，加个控制器，实现这些功能。

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);

    }

}

注意：在web中没这个问题，所以不用管。

巴特西

XAF-如何改变列表点击时的默认行为

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