将面板附加到TreeView控件 [英] attach a panel to TreeView control

问题描述

我是C#的初学者.在我的项目中，我在TreeView控件中填充了一个xml文件.如果xml文件很大，则TreeView控件将使用滚动条显示数据.除此之外，每当用户双击一个节点时，我都会在所选节点旁边显示一个面板，如下所示.

I am beginner in c#. In my project, I populated a xml file inside a TreeView control. If the xml file is large, the TreeView control is showing the data with scroll bars. Beside this, whenever the user double clicks a node I am showing a panel beside the selected node something like this..

当我滚动TreeView控件时:

我的问题是如何使panel附加到treeView控件，以便即使用户滚动TreeView控件，面板也应与所选节点一起移动.

My question is how to make the panel attached to treeView control so that eventhough the user scrolls the TreeView control the panel should also move along with the selected node.

推荐答案

好吧，因为TreeView没有Scroll事件，所以很难做到.无论如何，这是不可靠的，因为节点可以扩展和折叠，从而改变了节点的位置和可见性.备份计划是使用计时器.效果很好:

Well, hard to do since TreeView doesn't have a Scroll event. It isn't reliable anyway since nodes can be expanded and collapsed, changing the position and visibility of the node. The backup plan is to use a Timer. This worked well:

    private void timer1_Tick(object sender, EventArgs e) {
        var node = treeView1.SelectedNode;
        if (node == null || !node.IsVisible) panel1.Visible = false;
        else {
            panel1.Visible = true;
            var nodepos = treeView1.PointToScreen(node.Bounds.Location);
            var panelpos = panel1.Parent.PointToClient(nodepos);
            panel1.Top = panelpos.Y;
        }
    }

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