Question

我有一个关注TreeViewItem的问题。我有一点（有点看见）TreeView并刷新内容。视觉上，所选项目保持选中状态但逻辑上不是。在开始和结束时的焦点检查是不一样的，但在我看来他们应该。

这是我的代码（所有非工作重新聚焦的东西）：

private void Refresh(string selectedContent)
{
    //Check out the focused element
    //Returns "System.Windows.Controls.TreeViewItem Header:<my selectedContent-Value>; Items.Count:0"
    MessageBox.Show(Keyboard.FocusedElement.ToString());

    var currentFocus = Keyboard.FocusedElement;
    tv.Refresh(); //this refreshes the treeview

    //Not working
    Keyboard.Focus(currentFocus);

    //Not working
    DependencyObject focusScope = FocusManager.GetFocusScope(currentFocus);
    FocusManager.SetFocusedElement(focusScope, currentFocus);

    //also not working
    currentFocus.Focus();

    //not working
    Keyboard.Focus(tv.TryFindNode(selectedContent)); //TryFindNode searches the node in the TreeView and returns it

    //not working
    tv.TryFindNode(selectedContent).Focus();

    //Check out the focused element
    //returns "TreeViewTesting.TreeViewTesting" (my class where I'm testing this issue)
    MessageBox.Show(Keyboard.FocusedElement.ToString());
}

我不明白的是，这是有效的：

private void Refresh(string selectedContent)
{
    //Check out the focused element
    //Returns "System.Windows.Controls.TreeViewItem Header:<my selectedContent-Value>; Items.Count:0"
    MessageBox.Show(Keyboard.FocusedElement.ToString());

    tv.Refresh(); //this refreshes the treeview

    MessageBox.Show("I'm just a Message to show a messagebox");

    tv.TryFindNode(selectedContent).Focus();

    //Check out the focused element
    //Returns "System.Windows.Controls.TreeViewItem Header:<my selectedContent-Value>; Items.Count:0"
    MessageBox.Show(Keyboard.FocusedElement.ToString());
}

那么，我怎么做，Dummy-Messagebox正在做什么？有人有想法吗？

Answer 1

我有一个应用程序在TreeView中选择TreeNode后操纵其他控件。完成此过程后，TreeNode仍处于选中状态，但TreeView失去了焦点。

基于Hunv在上面的评论中的方法，我发现以下内容产生了所需的结果（选择了TreeView，选择了TreeNode）：

private void treeView_AfterSelect(object sender, TreeViewEventArgs e)
{
    ProcessMySelection();

    // give the app a chance to 'recover' and keep focus on the TreeView
    // i don't understand why this works -- is there a better way?
    Application.DoEvents()
}

刷新后关注TreeViewElement

1 个答案: