Question

我正在使用DevExpress SnapControl，我已设法使用自定义Data Explorer Dock Panel替换MenuCommandHandler中的“添加数据源”上下文菜单，因为DevExpress数据源向导需要永远加载，我们正在使用Active Query Builder进行可视化查询构建。

我现在遇到的问题是，当我想要“删除数据源”时，我就陷入了困境。我可以像“添加数据源”一样覆盖事件，但我不知道在DataSet中选择了哪个treeview需要删除。

有关如何选择节点或右键单击的节点文本的任何帮助，我们将不胜感激。

因为使用MenuCommand，CommandID等，我有点超出我的深度。我花了一段时间才能覆盖被触发的事件本身，但最终在几个小时之后就把它想出来了。

这是我的实施

public DevExReportSnapDesignerForm()
{
    InitializeComponent();
    MenuCommandHandler menuCommandHandler = new CustomMenuCommandHandler(report);
    menuCommandHandler.RegisterMenuCommands();
    report.RemoveService(typeof(MenuCommandHandler));
    report.AddService(typeof(MenuCommandHandler), menuCommandHandler);
}

public class CustomMenuCommandHandler : MenuCommandHandler
{
    SnapControl snapControl;

    public CustomMenuCommandHandler(SnapControl snap)
        : base(snap)
    {
        snapControl = snap;
    }


    public override void UpdateCommandStatus()
    {
        base.UpdateCommandStatus();
        DevExpress.XtraReports.Design.Commands.CommandSetItem AddDS = null;
        DevExpress.XtraReports.Design.Commands.CommandSetItem RemoveDS = null;
        foreach (DevExpress.XtraReports.Design.Commands.CommandSetItem item in commands)
        {
            if (item.CommandID == DataExplorerCommands.AddDataSource)
                AddDS = item;
            if (item.CommandID == DataExplorerCommands.RemoveDataSource)
                RemoveDS = item;
        }
        if (AddDS != null)
            CreateCommandEventHandler(new EventHandler(AddDS_OnClick), AddDS);
        if (RemoveDS != null)
            CreateCommandEventHandler(new EventHandler(RemoveDS_OnClick), RemoveDS);
    }

    public void CreateCommandEventHandler(EventHandler handler, MenuCommand item)
    {
        var mcs = snapControl.GetService(typeof(IMenuCommandService)) as IMenuCommandService;
        var menuCommandID = new CommandID(item.CommandID.Guid, item.CommandID.ID);
        var MenuItem = new MenuCommand(handler, menuCommandID);
        mcs.RemoveCommand(item);
        mcs.AddCommand(MenuItem);
    }

    public void AddDS_OnClick(object sender, EventArgs e)
    {
        //Execute Add Code
    }

    public void RemoveDS_OnClick(object sender, EventArgs e)
    {
        //Remove Code
    }

}

修改

我已经在SnapFieldListTreeView的MouseDown事件上分配了一个事件处理程序，方法是在表单构造函数中添加以下代码：

private SnapFieldListTreeView tv;
private TreeListNode dsTreeNode;

public DevExReportSnapDesignerForm()
{
    InitializeComponent();
    MenuCommandHandler menuCommandHandler = new CustomMenuCommandHandler(report);
    menuCommandHandler.RegisterMenuCommands();
    report.RemoveService(typeof(MenuCommandHandler));
    report.AddService(typeof(MenuCommandHandler), menuCommandHandler);
    tv = fieldListDockPanel1.Controls[0].Controls[0] as SnapFieldListTreeView;
    tv.MouseClick += Tv_MouseClick;
}

private void Tv_MouseClick(object sender, MouseEventArgs e)
{
    if (e.Button == MouseButtons.Right)
        dsTreeNode = tv.GetNodeAt(e.X, e.Y);
}

这样我可以检索被点击的节点。如果有更好的方法，请告诉我

Answer 1

您可以直接在SnapFieldListTreeView事件处理程序中使用RemoveDS_OnClick实例。您只需将SnapFieldListTreeView参数添加到自定义MenuCommandHandler构造函数即可。当前选定的DataSet将位于SnapFieldListTreeView.FocusedNode媒体资源中这是一个例子：

public DevExReportSnapDesignerForm()
{
    InitializeComponent();
    MenuCommandHandler menuCommandHandler = new CustomMenuCommandHandler(
        report,
        fieldListDockPanel1.Controls[0].Controls[0] as SnapFieldListTreeView);
    menuCommandHandler.RegisterMenuCommands();
    report.RemoveService(typeof(MenuCommandHandler));
    report.AddService(typeof(MenuCommandHandler), menuCommandHandler);
}

public class CustomMenuCommandHandler : MenuCommandHandler
{
    SnapControl snapControl;
    private SnapFieldListTreeView treeView;

    public CustomMenuCommandHandler(SnapControl snap, SnapFieldListTreeView tree) : base(snap)
    {
        snapControl = snap;
        treeView = tree;
    }

    //Some stuff for MenuCommandHandler.
    //...

    public void RemoveDS_OnClick(object sender, EventArgs e)
    {
        var node = treeView.FocusedNode;//<= Here comes the selected DataSet's node.

        MessageBox.Show(node.GetDisplayText(""));

        //Remove Code
    }
}

DevExpress SnapControl Data Explorer Dock Panel中的哪个节点触发事件

1 个答案: